const bun = @import("root").bun;
const JSC = bun.JSC;
const String = bun.String;
const uws = bun.uws;
const std = @import("std");
pub const debug = bun.Output.scoped(.Postgres, false);
pub const int4 = u32;
pub const PostgresInt32 = int4;
pub const int8 = i64;
pub const PostgresInt64 = int8;
pub const short = u16;
pub const PostgresShort = u16;
const Crypto = JSC.API.Bun.Crypto;
const JSValue = JSC.JSValue;

pub const Data = union(enum) {
    owned: bun.ByteList,
    temporary: []const u8,
    empty: void,

    pub fn toOwned(this: @This()) !bun.ByteList {
        return switch (this) {
            .owned => this.owned,
            .temporary => bun.ByteList.init(try bun.default_allocator.dupe(u8, this.temporary)),
            .empty => bun.ByteList.init(&.{}),
        };
    }

    pub fn deinit(this: *@This()) void {
        switch (this.*) {
            .owned => this.owned.deinitWithAllocator(bun.default_allocator),
            .temporary => {},
            .empty => {},
        }
    }

    /// Zero bytes before deinit
    /// Generally, for security reasons.
    pub fn zdeinit(this: *@This()) void {
        switch (this.*) {
            .owned => {

                // Zero bytes before deinit
                @memset(this.owned.slice(), 0);

                this.owned.deinitWithAllocator(bun.default_allocator);
            },
            .temporary => {},
            .empty => {},
        }
    }

    pub fn slice(this: @This()) []const u8 {
        return switch (this) {
            .owned => this.owned.slice(),
            .temporary => this.temporary,
            .empty => "",
        };
    }

    pub fn substring(this: @This(), start_index: usize, end_index: usize) Data {
        return switch (this) {
            .owned => .{ .temporary = this.owned.slice()[start_index..end_index] },
            .temporary => .{ .temporary = this.temporary[start_index..end_index] },
            .empty => .{ .empty = {} },
        };
    }

    pub fn sliceZ(this: @This()) [:0]const u8 {
        return switch (this) {
            .owned => this.owned.slice()[0..this.owned.len :0],
            .temporary => this.temporary[0..this.temporary.len :0],
            .empty => "",
        };
    }
};
pub const protocol = @import("./postgres/postgres_protocol.zig");
pub const types = @import("./postgres/postgres_types.zig");

const Socket = uws.AnySocket;
const PreparedStatementsMap = std.HashMapUnmanaged(u64, *PostgresSQLStatement, bun.IdentityContext(u64), 80);

const SocketMonitor = struct {
    const DebugSocketMonitorWriter = struct {
        var file: std.fs.File = undefined;
        var enabled = false;
        var check = std.once(load);
        pub fn write(data: []const u8) void {
            file.writeAll(data) catch {};
        }

        fn load() void {
            if (bun.getenvZAnyCase("BUN_POSTGRES_SOCKET_MONITOR")) |monitor| {
                enabled = true;
                file = std.fs.cwd().createFile(monitor, .{ .truncate = true }) catch {
                    enabled = false;
                    return;
                };
                debug("writing to {s}", .{monitor});
            }
        }
    };

    const DebugSocketMonitorReader = struct {
        var file: std.fs.File = undefined;
        var enabled = false;
        var check = std.once(load);

        fn load() void {
            if (bun.getenvZAnyCase("BUN_POSTGRES_SOCKET_MONITOR_READER")) |monitor| {
                enabled = true;
                file = std.fs.cwd().createFile(monitor, .{ .truncate = true }) catch {
                    enabled = false;
                    return;
                };
                debug("duplicating reads to {s}", .{monitor});
            }
        }

        pub fn write(data: []const u8) void {
            file.writeAll(data) catch {};
        }
    };

    pub fn write(data: []const u8) void {
        if (comptime bun.Environment.isDebug) {
            DebugSocketMonitorWriter.check.call();
            if (DebugSocketMonitorWriter.enabled) {
                DebugSocketMonitorWriter.write(data);
            }
        }
    }

    pub fn read(data: []const u8) void {
        if (comptime bun.Environment.isDebug) {
            DebugSocketMonitorReader.check.call();
            if (DebugSocketMonitorReader.enabled) {
                DebugSocketMonitorReader.write(data);
            }
        }
    }
};

pub const PostgresSQLContext = struct {
    tcp: ?*uws.SocketContext = null,

    onQueryResolveFn: JSC.Strong = .{},
    onQueryRejectFn: JSC.Strong = .{},

    pub fn init(globalObject: *JSC.JSGlobalObject, callframe: *JSC.CallFrame) bun.JSError!JSC.JSValue {
        var ctx = &globalObject.bunVM().rareData().postgresql_context;
        ctx.onQueryResolveFn.set(globalObject, callframe.argument(0));
        ctx.onQueryRejectFn.set(globalObject, callframe.argument(1));

        return .undefined;
    }

    comptime {
        if (!JSC.is_bindgen) {
            const js_init = JSC.toJSHostFunction(init);
            @export(js_init, .{ .name = "PostgresSQLContext__init" });
        }
    }
};

pub const PostgresSQLQuery = struct {
    statement: ?*PostgresSQLStatement = null,
    query: bun.String = bun.String.empty,
    cursor_name: bun.String = bun.String.empty,
    thisValue: JSValue = .undefined,
    target: JSC.Strong = JSC.Strong.init(),
    status: Status = Status.pending,
    is_done: bool = false,
    ref_count: std.atomic.Value(u32) = std.atomic.Value(u32).init(1),
    binary: bool = false,
    pending_value: JSC.Strong = .{},

    pub usingnamespace JSC.Codegen.JSPostgresSQLQuery;

    pub const Status = enum(u8) {
        pending,
        written,
        running,
        binding,
        success,
        fail,

        pub fn isRunning(this: Status) bool {
            return this == .running or this == .binding;
        }
    };

    pub fn hasPendingActivity(this: *@This()) bool {
        return this.ref_count.load(.monotonic) > 1;
    }

    pub fn deinit(this: *@This()) void {
        if (this.statement) |statement| {
            statement.deref();
        }
        this.query.deref();
        this.cursor_name.deref();
        this.target.deinit();
        this.pending_value.deinit();

        bun.default_allocator.destroy(this);
    }

    pub fn finalize(this: *@This()) void {
        debug("PostgresSQLQuery finalize", .{});
        this.thisValue = .zero;
        this.deref();
    }

    pub fn deref(this: *@This()) void {
        const ref_count = this.ref_count.fetchSub(1, .monotonic);

        if (ref_count == 1) {
            this.deinit();
        }
    }

    pub fn ref(this: *@This()) void {
        bun.assert(this.ref_count.fetchAdd(1, .monotonic) > 0);
    }

    pub fn onNoData(this: *@This(), globalObject: *JSC.JSGlobalObject) void {
        this.status = .success;
        defer this.deref();

        const thisValue = this.thisValue;
        const targetValue = this.target.trySwap() orelse JSValue.zero;
        if (thisValue == .zero or targetValue == .zero) {
            return;
        }

        const vm = JSC.VirtualMachine.get();
        const function = vm.rareData().postgresql_context.onQueryResolveFn.get().?;
        const event_loop = vm.eventLoop();
        event_loop.runCallback(function, globalObject, thisValue, &.{
            targetValue,
            this.pending_value.trySwap() orelse .undefined,
            JSValue.jsNumber(0),
            JSValue.jsNumber(0),
        });
    }
    pub fn onWriteFail(this: *@This(), err: anyerror, globalObject: *JSC.JSGlobalObject) void {
        this.status = .fail;
        this.pending_value.deinit();
        const thisValue = this.thisValue;
        const targetValue = this.target.trySwap() orelse JSValue.zero;
        if (thisValue == .zero or targetValue == .zero) {
            return;
        }

        const instance = globalObject.createErrorInstance("Failed to bind query: {s}", .{@errorName(err)});

        // TODO: error handling
        const vm = JSC.VirtualMachine.get();
        const function = vm.rareData().postgresql_context.onQueryRejectFn.get().?;
        const event_loop = vm.eventLoop();
        event_loop.runCallback(function, globalObject, thisValue, &.{
            targetValue,
            instance,
        });
    }

    pub fn onError(this: *@This(), err: protocol.ErrorResponse, globalObject: *JSC.JSGlobalObject) void {
        this.status = .fail;
        defer this.deref();

        const thisValue = this.thisValue;
        const targetValue = this.target.trySwap() orelse JSValue.zero;
        if (thisValue == .zero or targetValue == .zero) {
            return;
        }

        // TODO: error handling
        var vm = JSC.VirtualMachine.get();
        const function = vm.rareData().postgresql_context.onQueryRejectFn.get().?;
        globalObject.queueMicrotask(function, &[_]JSValue{ targetValue, err.toJS(globalObject) });
    }

    const CommandTag = union(enum) {
        // For an INSERT command, the tag is INSERT oid rows, where rows is the
        // number of rows inserted. oid used to be the object ID of the inserted
        // row if rows was 1 and the target table had OIDs, but OIDs system
        // columns are not supported anymore; therefore oid is always 0.
        INSERT: u64,
        // For a DELETE command, the tag is DELETE rows where rows is the number
        // of rows deleted.
        DELETE: u64,
        // For an UPDATE command, the tag is UPDATE rows where rows is the
        // number of rows updated.
        UPDATE: u64,
        // For a MERGE command, the tag is MERGE rows where rows is the number
        // of rows inserted, updated, or deleted.
        MERGE: u64,
        // For a SELECT or CREATE TABLE AS command, the tag is SELECT rows where
        // rows is the number of rows retrieved.
        SELECT: u64,
        // For a MOVE command, the tag is MOVE rows where rows is the number of
        // rows the cursor's position has been changed by.
        MOVE: u64,
        // For a FETCH command, the tag is FETCH rows where rows is the number
        // of rows that have been retrieved from the cursor.
        FETCH: u64,
        // For a COPY command, the tag is COPY rows where rows is the number of
        // rows copied. (Note: the row count appears only in PostgreSQL 8.2 and
        // later.)
        COPY: u64,

        other: []const u8,

        pub fn toJSTag(this: CommandTag, globalObject: *JSC.JSGlobalObject) JSValue {
            return switch (this) {
                .INSERT => JSValue.jsNumber(1),
                .DELETE => JSValue.jsNumber(2),
                .UPDATE => JSValue.jsNumber(3),
                .MERGE => JSValue.jsNumber(4),
                .SELECT => JSValue.jsNumber(5),
                .MOVE => JSValue.jsNumber(6),
                .FETCH => JSValue.jsNumber(7),
                .COPY => JSValue.jsNumber(8),
                .other => |tag| JSC.ZigString.init(tag).toJS(globalObject),
            };
        }

        pub fn toJSNumber(this: CommandTag) JSValue {
            return switch (this) {
                .other => JSValue.jsNumber(0),
                inline else => |val| JSValue.jsNumber(val),
            };
        }

        const KnownCommand = enum {
            INSERT,
            DELETE,
            UPDATE,
            MERGE,
            SELECT,
            MOVE,
            FETCH,
            COPY,

            pub const Map = bun.ComptimeEnumMap(KnownCommand);
        };

        pub fn init(tag: []const u8) CommandTag {
            const first_space_index = bun.strings.indexOfChar(tag, ' ') orelse return .{ .other = tag };
            const cmd = KnownCommand.Map.get(tag[0..first_space_index]) orelse return .{
                .other = tag,
            };

            const number = brk: {
                switch (cmd) {
                    .INSERT => {
                        var remaining = tag[@min(first_space_index + 1, tag.len)..];
                        const second_space = bun.strings.indexOfChar(remaining, ' ') orelse return .{ .other = tag };
                        remaining = remaining[@min(second_space + 1, remaining.len)..];
                        break :brk std.fmt.parseInt(u64, remaining, 0) catch |err| {
                            debug("CommandTag failed to parse number: {s}", .{@errorName(err)});
                            return .{ .other = tag };
                        };
                    },
                    else => {
                        const after_tag = tag[@min(first_space_index + 1, tag.len)..];
                        break :brk std.fmt.parseInt(u64, after_tag, 0) catch |err| {
                            debug("CommandTag failed to parse number: {s}", .{@errorName(err)});
                            return .{ .other = tag };
                        };
                    },
                }
            };

            switch (cmd) {
                inline else => |t| return @unionInit(CommandTag, @tagName(t), number),
            }
        }
    };

    pub fn onSuccess(this: *@This(), command_tag_str: []const u8, globalObject: *JSC.JSGlobalObject) void {
        this.status = .success;
        defer this.deref();

        const thisValue = this.thisValue;
        const targetValue = this.target.trySwap() orelse JSValue.zero;
        if (thisValue == .zero or targetValue == .zero) {
            this.pending_value.deinit();
            return;
        }

        const tag = CommandTag.init(command_tag_str);

        const vm = JSC.VirtualMachine.get();
        const function = vm.rareData().postgresql_context.onQueryResolveFn.get().?;
        const event_loop = vm.eventLoop();

        event_loop.runCallback(function, globalObject, thisValue, &.{
            targetValue,
            this.pending_value.trySwap() orelse .undefined,
            tag.toJSTag(globalObject),
            tag.toJSNumber(),
        });
    }

    pub fn constructor(globalThis: *JSC.JSGlobalObject, callframe: *JSC.CallFrame) bun.JSError!*PostgresSQLQuery {
        _ = callframe;
        return globalThis.throw2("PostgresSQLQuery cannot be constructed directly", .{});
    }

    pub fn estimatedSize(this: *PostgresSQLQuery) usize {
        _ = this;
        return @sizeOf(PostgresSQLQuery);
    }

    pub fn call(globalThis: *JSC.JSGlobalObject, callframe: *JSC.CallFrame) bun.JSError!JSC.JSValue {
        const arguments = callframe.arguments(4).slice();
        const query = arguments[0];
        const values = arguments[1];
        const columns = arguments[3];

        if (!query.isString()) {
            globalThis.throw("query must be a string", .{});
            return .zero;
        }

        if (values.jsType() != .Array) {
            globalThis.throw("values must be an array", .{});
            return .zero;
        }

        const pending_value = arguments[2];
        if (!pending_value.jsType().isArrayLike()) {
            globalThis.throwInvalidArgumentType("query", "pendingValue", "Array");
            return .zero;
        }

        var ptr = bun.default_allocator.create(PostgresSQLQuery) catch |err| {
            globalThis.throwError(err, "failed to allocate query");
            return .zero;
        };

        const this_value = ptr.toJS(globalThis);
        this_value.ensureStillAlive();

        ptr.* = .{
            .query = query.toBunString(globalThis),
            .thisValue = this_value,
        };
        ptr.query.ref();

        PostgresSQLQuery.bindingSetCached(this_value, globalThis, values);
        PostgresSQLQuery.pendingValueSetCached(this_value, globalThis, pending_value);
        if (columns != .undefined) {
            PostgresSQLQuery.columnsSetCached(this_value, globalThis, columns);
        }
        ptr.pending_value.set(globalThis, pending_value);

        return this_value;
    }

    pub fn push(this: *PostgresSQLQuery, globalThis: *JSC.JSGlobalObject, value: JSValue) void {
        var pending_value = this.pending_value.get() orelse return;
        pending_value.push(globalThis, value);
    }

    pub fn doDone(this: *@This(), globalObject: *JSC.JSGlobalObject, _: *JSC.CallFrame) bun.JSError!JSValue {
        _ = globalObject;
        this.is_done = true;
        return .undefined;
    }

    pub fn doRun(this: *PostgresSQLQuery, globalObject: *JSC.JSGlobalObject, callframe: *JSC.CallFrame) bun.JSError!JSValue {
        var arguments_ = callframe.arguments(2);
        const arguments = arguments_.slice();
        var connection = arguments[0].as(PostgresSQLConnection) orelse {
            globalObject.throw("connection must be a PostgresSQLConnection", .{});
            return .zero;
        };
        var query = arguments[1];

        if (!query.isObject()) {
            globalObject.throwInvalidArgumentType("run", "query", "Query");
            return .zero;
        }

        this.target.set(globalObject, query);
        const binding_value = PostgresSQLQuery.bindingGetCached(callframe.this()) orelse .zero;
        var query_str = this.query.toUTF8(bun.default_allocator);
        defer query_str.deinit();
        const columns_value = PostgresSQLQuery.columnsGetCached(callframe.this()) orelse .undefined;

        var signature = Signature.generate(globalObject, query_str.slice(), binding_value, columns_value) catch |err| {
            if (!globalObject.hasException())
                globalObject.throwError(err, "failed to generate signature");
            return .zero;
        };

        var writer = connection.writer();

        const entry = connection.statements.getOrPut(bun.default_allocator, bun.hash(signature.name)) catch |err| {
            globalObject.throwError(err, "failed to allocate statement");
            signature.deinit();
            return .zero;
        };

        const has_params = signature.fields.len > 0;
        var did_write = false;

        enqueue: {
            if (entry.found_existing) {
                this.statement = entry.value_ptr.*;
                this.statement.?.ref();
                signature.deinit();

                if (has_params and this.statement.?.status == .parsing) {
                    // if it has params, we need to wait for ParamDescription to be received before we can write the data
                } else {
                    this.binary = this.statement.?.fields.len > 0;

                    PostgresRequest.bindAndExecute(globalObject, this.statement.?, binding_value, columns_value, PostgresSQLConnection.Writer, writer) catch |err| {
                        if (!globalObject.hasException())
                            globalObject.throwError(err, "failed to bind and execute query");

                        return .zero;
                    };
                    did_write = true;
                }

                break :enqueue;
            }

            // If it does not have params, we can write and execute immediately in one go
            if (!has_params) {
                PostgresRequest.prepareAndQueryWithSignature(globalObject, query_str.slice(), binding_value, PostgresSQLConnection.Writer, writer, &signature) catch |err| {
                    if (!globalObject.hasException())
                        globalObject.throwError(err, "failed to prepare and query");
                    signature.deinit();
                    return .zero;
                };
                did_write = true;
            } else {
                PostgresRequest.writeQuery(query_str.slice(), signature.name, signature.fields, PostgresSQLConnection.Writer, writer) catch |err| {
                    if (!globalObject.hasException())
                        globalObject.throwError(err, "failed to write query");
                    signature.deinit();
                    return .zero;
                };
                writer.write(&protocol.Sync) catch |err| {
                    if (!globalObject.hasException())
                        globalObject.throwError(err, "failed to flush");
                    signature.deinit();
                    return .zero;
                };
            }

            {
                const stmt = bun.default_allocator.create(PostgresSQLStatement) catch |err| {
                    globalObject.throwError(err, "failed to allocate statement");
                    return .zero;
                };

                stmt.* = .{ .signature = signature, .ref_count = 2, .status = PostgresSQLStatement.Status.parsing };
                this.statement = stmt;
                entry.value_ptr.* = stmt;
            }
        }

        connection.requests.writeItem(this) catch {};
        this.ref();
        this.status = if (did_write) .binding else .pending;

        if (connection.is_ready_for_query)
            connection.flushData();

        return .undefined;
    }

    pub fn doCancel(this: *PostgresSQLQuery, globalObject: *JSC.JSGlobalObject, callframe: *JSC.CallFrame) bun.JSError!JSValue {
        _ = callframe;
        _ = globalObject;
        _ = this;

        return .undefined;
    }

    comptime {
        if (!JSC.is_bindgen) {
            const jscall = JSC.toJSHostFunction(call);
            @export(jscall, .{ .name = "PostgresSQLQuery__createInstance" });
        }
    }
};

pub const PostgresRequest = struct {
    pub fn writeBind(
        name: []const u8,
        cursor_name: bun.String,
        globalObject: *JSC.JSGlobalObject,
        values_array: JSValue,
        columns_value: JSValue,
        parameter_fields: []const int4,
        result_fields: []const protocol.FieldDescription,
        comptime Context: type,
        writer: protocol.NewWriter(Context),
    ) !void {
        try writer.write("B");
        const length = try writer.length();

        try writer.String(cursor_name);
        try writer.string(name);

        const len: u32 = @truncate(parameter_fields.len);

        // The number of parameter format codes that follow (denoted C
        // below). This can be zero to indicate that there are no
        // parameters or that the parameters all use the default format
        // (text); or one, in which case the specified format code is
        // applied to all parameters; or it can equal the actual number
        // of parameters.
        try writer.short(len);

        var iter = QueryBindingIterator.init(values_array, columns_value, globalObject);
        for (0..len) |i| {
            const tag: types.Tag = @enumFromInt(@as(short, @intCast(parameter_fields[i])));

            const force_text = tag.isBinaryFormatSupported() and brk: {
                iter.to(@truncate(i));
                if (iter.next()) |value| {
                    break :brk value.isString();
                }
                if (iter.anyFailed()) {
                    return error.InvalidQueryBinding;
                }
                break :brk false;
            };

            if (force_text) {
                // If they pass a value as a string, let's avoid attempting to
                // convert it to the binary representation. This minimizes the room
                // for mistakes on our end, such as stripping the timezone
                // differently than what Postgres does when given a timestamp with
                // timezone.
                try writer.short(0);
                continue;
            }

            try writer.short(
                tag.formatCode(),
            );
        }

        // The number of parameter values that follow (possibly zero). This
        // must match the number of parameters needed by the query.
        try writer.short(len);

        debug("Bind: {} ({d} args)", .{ bun.fmt.quote(name), len });
        iter.to(0);
        var i: usize = 0;
        while (iter.next()) |value| : (i += 1) {
            const tag: types.Tag = @enumFromInt(@as(short, @intCast(parameter_fields[i])));
            if (value.isEmptyOrUndefinedOrNull()) {
                debug("  -> NULL", .{});
                //  As a special case, -1 indicates a
                // NULL parameter value. No value bytes follow in the NULL case.
                try writer.int4(@bitCast(@as(i32, -1)));
                continue;
            }

            debug("  -> {s}", .{@tagName(tag)});
            switch (
            // If they pass a value as a string, let's avoid attempting to
            // convert it to the binary representation. This minimizes the room
            // for mistakes on our end, such as stripping the timezone
            // differently than what Postgres does when given a timestamp with
            // timezone.
            if (tag.isBinaryFormatSupported() and value.isString()) .text else tag) {
                .json => {
                    var str = bun.String.empty;
                    defer str.deref();
                    value.jsonStringify(globalObject, 0, &str);
                    const slice = str.toUTF8WithoutRef(bun.default_allocator);
                    defer slice.deinit();
                    const l = try writer.length();
                    try writer.write(slice.slice());
                    try l.writeExcludingSelf();
                },
                .bool => {
                    const l = try writer.length();
                    try writer.write(&[1]u8{@intFromBool(value.toBoolean())});
                    try l.writeExcludingSelf();
                },
                .timestamp, .timestamptz => {
                    const l = try writer.length();
                    try writer.int8(types.date.fromJS(globalObject, value));
                    try l.writeExcludingSelf();
                },
                .bytea => {
                    var bytes: []const u8 = "";
                    if (value.asArrayBuffer(globalObject)) |buf| {
                        bytes = buf.byteSlice();
                    }
                    const l = try writer.length();
                    debug("    {d} bytes", .{bytes.len});

                    try writer.write(bytes);
                    try l.writeExcludingSelf();
                },
                .int4 => {
                    const l = try writer.length();
                    try writer.int4(@bitCast(value.coerceToInt32(globalObject)));
                    try l.writeExcludingSelf();
                },
                .int4_array => {
                    const l = try writer.length();
                    try writer.int4(@bitCast(value.coerceToInt32(globalObject)));
                    try l.writeExcludingSelf();
                },
                .float8 => {
                    const l = try writer.length();
                    try writer.f64(@bitCast(value.coerceToDouble(globalObject)));
                    try l.writeExcludingSelf();
                },

                else => {
                    const str = String.fromJSRef(value, globalObject);
                    defer str.deref();
                    const slice = str.toUTF8WithoutRef(bun.default_allocator);
                    defer slice.deinit();
                    const l = try writer.length();
                    try writer.write(slice.slice());
                    try l.writeExcludingSelf();
                },
            }
        }

        var any_non_text_fields: bool = false;
        for (result_fields) |field| {
            if (field.typeTag().isBinaryFormatSupported()) {
                any_non_text_fields = true;
                break;
            }
        }

        if (any_non_text_fields) {
            try writer.short(result_fields.len);
            for (result_fields) |field| {
                try writer.short(
                    field.typeTag().formatCode(),
                );
            }
        } else {
            try writer.short(0);
        }

        try length.write();
    }

    pub fn writeQuery(
        query: []const u8,
        name: []const u8,
        params: []const int4,
        comptime Context: type,
        writer: protocol.NewWriter(Context),
    ) !void {
        {
            var q = protocol.Parse{
                .name = name,
                .params = params,
                .query = query,
            };
            try q.writeInternal(Context, writer);
            debug("Parse: {}", .{bun.fmt.quote(query)});
        }

        {
            var d = protocol.Describe{
                .p = .{
                    .prepared_statement = name,
                },
            };
            try d.writeInternal(Context, writer);
            debug("Describe: {}", .{bun.fmt.quote(name)});
        }
    }

    pub fn prepareAndQueryWithSignature(
        globalObject: *JSC.JSGlobalObject,
        query: []const u8,
        array_value: JSValue,
        comptime Context: type,
        writer: protocol.NewWriter(Context),
        signature: *Signature,
    ) !void {
        try writeQuery(query, signature.name, signature.fields, Context, writer);
        try writeBind(signature.name, bun.String.empty, globalObject, array_value, .zero, &.{}, &.{}, Context, writer);
        var exec = protocol.Execute{
            .p = .{
                .prepared_statement = signature.name,
            },
        };
        try exec.writeInternal(Context, writer);

        try writer.write(&protocol.Flush);
        try writer.write(&protocol.Sync);
    }

    pub fn bindAndExecute(
        globalObject: *JSC.JSGlobalObject,
        statement: *PostgresSQLStatement,
        array_value: JSValue,
        columns_value: JSValue,
        comptime Context: type,
        writer: protocol.NewWriter(Context),
    ) !void {
        try writeBind(statement.signature.name, bun.String.empty, globalObject, array_value, columns_value, statement.parameters, statement.fields, Context, writer);
        var exec = protocol.Execute{
            .p = .{
                .prepared_statement = statement.signature.name,
            },
        };
        try exec.writeInternal(Context, writer);

        try writer.write(&protocol.Flush);
        try writer.write(&protocol.Sync);
    }

    pub fn onData(
        connection: *PostgresSQLConnection,
        comptime Context: type,
        reader: protocol.NewReader(Context),
    ) !void {
        while (true) {
            reader.markMessageStart();

            switch (try reader.int(u8)) {
                'D' => try connection.on(.DataRow, Context, reader),
                'd' => try connection.on(.CopyData, Context, reader),
                'S' => try connection.on(.ParameterStatus, Context, reader),
                'Z' => try connection.on(.ReadyForQuery, Context, reader),
                'C' => try connection.on(.CommandComplete, Context, reader),
                '2' => try connection.on(.BindComplete, Context, reader),
                '1' => try connection.on(.ParseComplete, Context, reader),
                't' => try connection.on(.ParameterDescription, Context, reader),
                'T' => try connection.on(.RowDescription, Context, reader),
                'R' => try connection.on(.Authentication, Context, reader),
                'n' => try connection.on(.NoData, Context, reader),
                'K' => try connection.on(.BackendKeyData, Context, reader),
                'E' => try connection.on(.ErrorResponse, Context, reader),
                's' => try connection.on(.PortalSuspended, Context, reader),
                '3' => try connection.on(.CloseComplete, Context, reader),
                'G' => try connection.on(.CopyInResponse, Context, reader),
                'N' => try connection.on(.NoticeResponse, Context, reader),
                'I' => try connection.on(.EmptyQueryResponse, Context, reader),
                'H' => try connection.on(.CopyOutResponse, Context, reader),
                'c' => try connection.on(.CopyDone, Context, reader),
                'W' => try connection.on(.CopyBothResponse, Context, reader),

                else => |c| {
                    debug("Unknown message: {d}", .{c});
                    const to_skip = try reader.length() -| 1;
                    try reader.skip(@intCast(@max(to_skip, 0)));
                },
            }
        }
    }

    pub const Queue = std.fifo.LinearFifo(*PostgresSQLQuery, .Dynamic);
};

pub const PostgresSQLConnection = struct {
    socket: Socket,
    status: Status = Status.connecting,
    ref_count: u32 = 1,

    write_buffer: bun.OffsetByteList = .{},
    read_buffer: bun.OffsetByteList = .{},
    last_message_start: u32 = 0,
    requests: PostgresRequest.Queue,

    poll_ref: bun.Async.KeepAlive = .{},
    globalObject: *JSC.JSGlobalObject,

    statements: PreparedStatementsMap,
    pending_activity_count: std.atomic.Value(u32) = std.atomic.Value(u32).init(0),
    js_value: JSValue = JSValue.undefined,

    is_ready_for_query: bool = false,

    backend_parameters: bun.StringMap = bun.StringMap.init(bun.default_allocator, true),
    backend_key_data: protocol.BackendKeyData = .{},

    pending_disconnect: bool = false,

    on_connect: JSC.Strong = .{},
    on_close: JSC.Strong = .{},

    database: []const u8 = "",
    user: []const u8 = "",
    password: []const u8 = "",
    options: []const u8 = "",
    options_buf: []const u8 = "",

    authentication_state: AuthenticationState = .{ .pending = {} },

    pub const AuthenticationState = union(enum) {
        pending: void,
        SASL: SASL,
        ok: void,

        pub fn zero(this: *AuthenticationState) void {
            const bytes = std.mem.asBytes(this);
            @memset(bytes, 0);
        }

        pub const SASL = struct {
            const nonce_byte_len = 18;
            const nonce_base64_len = bun.base64.encodeLenFromSize(nonce_byte_len);

            const server_signature_byte_len = 32;
            const server_signature_base64_len = bun.base64.encodeLenFromSize(server_signature_byte_len);

            const salted_password_byte_len = 32;

            nonce_base64_bytes: [nonce_base64_len]u8 = .{0} ** nonce_base64_len,
            nonce_len: u8 = 0,

            server_signature_base64_bytes: [server_signature_base64_len]u8 = .{0} ** server_signature_base64_len,
            server_signature_len: u8 = 0,

            salted_password_bytes: [salted_password_byte_len]u8 = .{0} ** salted_password_byte_len,
            salted_password_created: bool = false,

            status: SASLStatus = .init,

            pub const SASLStatus = enum {
                init,
                @"continue",
            };

            fn hmac(password: []const u8, data: []const u8) ?[32]u8 {
                var buf = std.mem.zeroes([bun.BoringSSL.EVP_MAX_MD_SIZE]u8);

                // TODO: I don't think this is failable.
                const result = bun.hmac.generate(password, data, .sha256, &buf) orelse return null;

                assert(result.len == 32);
                return buf[0..32].*;
            }

            pub fn computeSaltedPassword(this: *SASL, salt_bytes: []const u8, iteration_count: u32, connection: *PostgresSQLConnection) !void {
                this.salted_password_created = true;
                if (Crypto.EVP.pbkdf2(&this.salted_password_bytes, connection.password, salt_bytes, iteration_count, .sha256) == null) {
                    return error.PBKDF2Failed;
                }
            }

            pub fn saltedPassword(this: *const SASL) []const u8 {
                assert(this.salted_password_created);
                return this.salted_password_bytes[0..salted_password_byte_len];
            }

            pub fn serverSignature(this: *const SASL) []const u8 {
                assert(this.server_signature_len > 0);
                return this.server_signature_base64_bytes[0..this.server_signature_len];
            }

            pub fn computeServerSignature(this: *SASL, auth_string: []const u8) !void {
                assert(this.server_signature_len == 0);

                const server_key = hmac(this.saltedPassword(), "Server Key") orelse return error.InvalidServerKey;
                const server_signature_bytes = hmac(&server_key, auth_string) orelse return error.InvalidServerSignature;
                this.server_signature_len = @intCast(bun.base64.encode(&this.server_signature_base64_bytes, &server_signature_bytes));
            }

            pub fn clientKey(this: *const SASL) [32]u8 {
                return hmac(this.saltedPassword(), "Client Key").?;
            }

            pub fn clientKeySignature(_: *const SASL, client_key: []const u8, auth_string: []const u8) [32]u8 {
                var sha_digest = std.mem.zeroes(bun.sha.SHA256.Digest);
                bun.sha.SHA256.hash(client_key, &sha_digest, JSC.VirtualMachine.get().rareData().boringEngine());
                return hmac(&sha_digest, auth_string).?;
            }

            pub fn nonce(this: *SASL) []const u8 {
                if (this.nonce_len == 0) {
                    var bytes: [nonce_byte_len]u8 = .{0} ** nonce_byte_len;
                    bun.rand(&bytes);
                    this.nonce_len = @intCast(bun.base64.encode(&this.nonce_base64_bytes, &bytes));
                }
                return this.nonce_base64_bytes[0..this.nonce_len];
            }

            pub fn deinit(this: *SASL) void {
                this.nonce_len = 0;
                this.salted_password_created = false;
                this.server_signature_len = 0;
                this.status = .init;
            }
        };
    };

    pub const Status = enum {
        disconnected,
        connecting,
        connected,
        failed,
    };

    pub usingnamespace JSC.Codegen.JSPostgresSQLConnection;

    pub fn hasPendingActivity(this: *PostgresSQLConnection) bool {
        @fence(.acquire);
        return this.pending_activity_count.load(.acquire) > 0;
    }

    fn updateHasPendingActivity(this: *PostgresSQLConnection) void {
        @fence(.release);
        const a: u32 = if (this.requests.readableLength() > 0) 1 else 0;
        const b: u32 = if (this.status != .disconnected) 1 else 0;
        this.pending_activity_count.store(a + b, .release);
    }

    pub fn setStatus(this: *PostgresSQLConnection, status: Status) void {
        defer this.updateHasPendingActivity();

        if (this.status == status) return;

        this.status = status;
        switch (status) {
            .connected => {
                const on_connect = this.on_connect.swap();
                if (on_connect == .zero) return;
                const js_value = this.js_value;
                js_value.ensureStillAlive();
                this.globalObject.queueMicrotask(on_connect, &[_]JSValue{ JSValue.jsNull(), js_value });
                this.poll_ref.unref(this.globalObject.bunVM());
                this.updateHasPendingActivity();
            },
            else => {},
        }
    }

    pub fn finalize(this: *PostgresSQLConnection) void {
        debug("PostgresSQLConnection finalize", .{});
        this.js_value = .zero;
        this.deref();
    }

    pub fn flushData(this: *PostgresSQLConnection) void {
        const chunk = this.write_buffer.remaining();
        if (chunk.len == 0) return;
        const wrote = this.socket.write(chunk, false);
        if (wrote > 0) {
            SocketMonitor.write(chunk[0..@intCast(wrote)]);
            this.write_buffer.consume(@intCast(wrote));
        }
    }

    pub fn fail(this: *PostgresSQLConnection, message: []const u8, err: anyerror) void {
        defer this.updateHasPendingActivity();
        if (this.status == .failed) return;
        debug("failed: {s}: {s}", .{ message, @errorName(err) });

        this.status = .failed;
        if (!this.socket.isClosed()) this.socket.close();
        const on_close = this.on_close.swap();
        if (on_close == .zero) return;
        const instance = this.globalObject.createErrorInstance("{s}", .{message});
        instance.put(this.globalObject, JSC.ZigString.static("code"), String.init(@errorName(err)).toJS(this.globalObject));
        _ = on_close.call(
            this.globalObject,
            this.js_value,
            &[_]JSValue{
                instance,
            },
        ) catch |e| this.globalObject.reportActiveExceptionAsUnhandled(e);
    }

    pub fn onClose(this: *PostgresSQLConnection) void {
        var vm = this.globalObject.bunVM();
        defer vm.drainMicrotasks();
        this.fail("Connection closed", error.ConnectionClosed);
    }

    pub fn onOpen(this: *PostgresSQLConnection, socket: uws.AnySocket) void {
        this.socket = socket;

        this.poll_ref.ref(this.globalObject.bunVM());
        this.updateHasPendingActivity();

        var msg = protocol.StartupMessage{ .user = Data{ .temporary = this.user }, .database = Data{ .temporary = this.database }, .options = Data{ .temporary = this.options } };
        msg.writeInternal(Writer, this.writer()) catch |err| {
            socket.close();
            this.fail("Failed to write startup message", err);
        };

        const event_loop = this.globalObject.bunVM().eventLoop();
        event_loop.enter();
        defer event_loop.exit();
        this.flushData();
    }

    pub fn onTimeout(this: *PostgresSQLConnection) void {
        _ = this; // autofix
        debug("onTimeout", .{});
    }

    pub fn onDrain(this: *PostgresSQLConnection) void {
        const event_loop = this.globalObject.bunVM().eventLoop();
        event_loop.enter();
        defer event_loop.exit();
        this.flushData();
    }

    pub fn onData(this: *PostgresSQLConnection, data: []const u8) void {
        this.ref();
        const vm = this.globalObject.bunVM();
        defer {
            if (this.status == .connected and this.requests.readableLength() == 0 and this.write_buffer.remaining().len == 0) {
                // Don't keep the process alive when there's nothing to do.
                this.poll_ref.unref(vm);
            } else if (this.status == .connected) {
                // Keep the process alive if there's something to do.
                this.poll_ref.ref(vm);
            }

            this.deref();
        }

        const event_loop = vm.eventLoop();
        event_loop.enter();
        defer event_loop.exit();
        SocketMonitor.read(data);
        if (this.read_buffer.remaining().len == 0) {
            var consumed: usize = 0;
            var offset: usize = 0;
            const reader = protocol.StackReader.init(data, &consumed, &offset);
            PostgresRequest.onData(this, protocol.StackReader, reader) catch |err| {
                if (err == error.ShortRead) {
                    if (comptime bun.Environment.allow_assert) {
                        // if (@errorReturnTrace()) |trace| {
                        //     debug("Received short read: last_message_start: {d}, head: {d}, len: {d}\n{}", .{
                        //         offset,
                        //         consumed,
                        //         data.len,
                        //         trace,
                        //     });
                        // } else {
                        debug("Received short read: last_message_start: {d}, head: {d}, len: {d}", .{
                            offset,
                            consumed,
                            data.len,
                        });
                        // }
                    }

                    this.read_buffer.head = 0;
                    this.last_message_start = 0;
                    this.read_buffer.byte_list.len = 0;
                    this.read_buffer.write(bun.default_allocator, data[offset..]) catch @panic("failed to write to read buffer");
                } else {
                    if (comptime bun.Environment.allow_assert) {
                        if (@errorReturnTrace()) |trace| {
                            debug("Error: {s}\n{}", .{ @errorName(err), trace });
                        }
                    }
                    this.fail("Failed to read data", err);
                }
            };
            return;
        }

        {
            this.read_buffer.head = this.last_message_start;
            this.read_buffer.write(bun.default_allocator, data) catch @panic("failed to write to read buffer");
            PostgresRequest.onData(this, Reader, this.bufferedReader()) catch |err| {
                if (err != error.ShortRead) {
                    if (comptime bun.Environment.allow_assert) {
                        if (@errorReturnTrace()) |trace| {
                            debug("Error: {s}\n{}", .{ @errorName(err), trace });
                        }
                    }
                    this.fail("Failed to read data", err);
                    return;
                }

                if (comptime bun.Environment.allow_assert) {
                    // if (@errorReturnTrace()) |trace| {
                    //     debug("Received short read: last_message_start: {d}, head: {d}, len: {d}\n{}", .{
                    //         this.last_message_start,
                    //         this.read_buffer.head,
                    //         this.read_buffer.byte_list.len,
                    //         trace,
                    //     });
                    // } else {
                    debug("Received short read: last_message_start: {d}, head: {d}, len: {d}", .{
                        this.last_message_start,
                        this.read_buffer.head,
                        this.read_buffer.byte_list.len,
                    });
                    // }
                }

                return;
            };

            this.last_message_start = 0;
            this.read_buffer.head = 0;
        }
    }

    pub fn constructor(globalObject: *JSC.JSGlobalObject, callframe: *JSC.CallFrame) bun.JSError!*PostgresSQLConnection {
        _ = callframe;
        return globalObject.throw2("PostgresSQLConnection cannot be constructed directly", .{});
    }

    comptime {
        if (!JSC.is_bindgen) {
            const jscall = JSC.toJSHostFunction(call);
            @export(jscall, .{ .name = "PostgresSQLConnection__createInstance" });
        }
    }

    pub fn call(globalObject: *JSC.JSGlobalObject, callframe: *JSC.CallFrame) bun.JSError!JSC.JSValue {
        var vm = globalObject.bunVM();
        const arguments = callframe.arguments(9).slice();
        const hostname_str = arguments[0].toBunString(globalObject);
        defer hostname_str.deref();
        const port = arguments[1].coerce(i32, globalObject);

        const username_str = arguments[2].toBunString(globalObject);
        defer username_str.deref();
        const password_str = arguments[3].toBunString(globalObject);
        defer password_str.deref();
        const database_str = arguments[4].toBunString(globalObject);
        defer database_str.deref();
        const tls_object = arguments[5];
        var username: []const u8 = "";
        var password: []const u8 = "";
        var database: []const u8 = "";
        var options: []const u8 = "";

        const options_str = arguments[6].toBunString(globalObject);
        defer options_str.deref();

        const options_buf: []u8 = brk: {
            var b = bun.StringBuilder{};
            b.cap += username_str.utf8ByteLength() + 1 + password_str.utf8ByteLength() + 1 + database_str.utf8ByteLength() + 1 + options_str.utf8ByteLength() + 1;

            b.allocate(bun.default_allocator) catch {};
            var u = username_str.toUTF8WithoutRef(bun.default_allocator);
            defer u.deinit();
            username = b.append(u.slice());

            var p = password_str.toUTF8WithoutRef(bun.default_allocator);
            defer p.deinit();
            password = b.append(p.slice());

            var d = database_str.toUTF8WithoutRef(bun.default_allocator);
            defer d.deinit();
            database = b.append(d.slice());

            var o = options_str.toUTF8WithoutRef(bun.default_allocator);
            defer o.deinit();
            options = b.append(o.slice());

            break :brk b.allocatedSlice();
        };

        const on_connect = arguments[7];
        const on_close = arguments[8];
        var ptr = bun.default_allocator.create(PostgresSQLConnection) catch |err| {
            globalObject.throwError(err, "failed to allocate connection");
            return .zero;
        };

        ptr.* = PostgresSQLConnection{
            .globalObject = globalObject,
            .on_connect = JSC.Strong.create(on_connect, globalObject),
            .on_close = JSC.Strong.create(on_close, globalObject),
            .database = database,
            .user = username,
            .password = password,
            .options = options,
            .options_buf = options_buf,
            .socket = undefined,
            .requests = PostgresRequest.Queue.init(bun.default_allocator),
            .statements = PreparedStatementsMap{},
        };

        ptr.updateHasPendingActivity();
        ptr.poll_ref.ref(vm);
        const js_value = ptr.toJS(globalObject);
        js_value.ensureStillAlive();
        ptr.js_value = js_value;

        {
            const hostname = hostname_str.toUTF8(bun.default_allocator);
            defer hostname.deinit();
            if (tls_object.isEmptyOrUndefinedOrNull()) {
                const ctx = vm.rareData().postgresql_context.tcp orelse brk: {
                    var err: uws.create_bun_socket_error_t = .none;
                    const ctx_ = uws.us_create_bun_socket_context(0, vm.uwsLoop(), @sizeOf(*PostgresSQLConnection), uws.us_bun_socket_context_options_t{}, &err).?;
                    uws.NewSocketHandler(false).configure(ctx_, true, *PostgresSQLConnection, SocketHandler(false));
                    vm.rareData().postgresql_context.tcp = ctx_;
                    break :brk ctx_;
                };
                ptr.socket = .{
                    // TODO: investigate if allowHalfOpen: true is necessary here or if brings some advantage
                    .SocketTCP = uws.SocketTCP.connectAnon(hostname.slice(), port, ctx, ptr, false) catch |err| {
                        globalObject.throwError(err, "failed to connect to postgresql");
                        ptr.deinit();
                        return .zero;
                    },
                };
            } else {
                // TODO:
                globalObject.throwTODO("TLS is not supported yet");
                ptr.deinit();
                return .zero;
            }
        }

        return js_value;
    }

    fn SocketHandler(comptime ssl: bool) type {
        return struct {
            const SocketType = uws.NewSocketHandler(ssl);
            fn _socket(s: SocketType) Socket {
                if (comptime ssl) {
                    return Socket{ .SocketTLS = s };
                }

                return Socket{ .SocketTCP = s };
            }
            pub fn onOpen(this: *PostgresSQLConnection, socket: SocketType) void {
                this.onOpen(_socket(socket));
            }

            pub fn onClose(this: *PostgresSQLConnection, socket: SocketType, _: i32, _: ?*anyopaque) void {
                _ = socket;
                this.onClose();
            }

            pub fn onEnd(this: *PostgresSQLConnection, socket: SocketType) void {
                _ = socket;
                this.onClose();
            }

            pub fn onConnectError(this: *PostgresSQLConnection, socket: SocketType, _: i32) void {
                _ = socket;
                this.onClose();
            }

            pub fn onTimeout(this: *PostgresSQLConnection, socket: SocketType) void {
                _ = socket;
                this.onTimeout();
            }

            pub fn onData(this: *PostgresSQLConnection, socket: SocketType, data: []const u8) void {
                _ = socket;
                this.onData(data);
            }

            pub fn onWritable(this: *PostgresSQLConnection, socket: SocketType) void {
                _ = socket;
                this.onDrain();
            }
        };
    }

    pub fn ref(this: *@This()) void {
        bun.assert(this.ref_count > 0);
        this.ref_count += 1;
    }

    pub fn doRef(this: *@This(), _: *JSC.JSGlobalObject, _: *JSC.CallFrame) bun.JSError!JSValue {
        this.poll_ref.ref(this.globalObject.bunVM());
        this.updateHasPendingActivity();
        return .undefined;
    }

    pub fn doUnref(this: *@This(), _: *JSC.JSGlobalObject, _: *JSC.CallFrame) bun.JSError!JSValue {
        this.poll_ref.unref(this.globalObject.bunVM());
        this.updateHasPendingActivity();
        return .undefined;
    }

    pub fn deref(this: *@This()) void {
        const ref_count = this.ref_count;
        this.ref_count -= 1;

        if (ref_count == 1) {
            this.disconnect();
            this.deinit();
        }
    }

    pub fn doClose(this: *@This(), globalObject: *JSC.JSGlobalObject, _: *JSC.CallFrame) bun.JSError!JSValue {
        _ = globalObject;
        this.disconnect();
        this.write_buffer.deinit(bun.default_allocator);

        return .undefined;
    }

    pub fn deinit(this: *@This()) void {
        var iter = this.statements.valueIterator();
        while (iter.next()) |stmt_ptr| {
            var stmt = stmt_ptr.*;
            stmt.deref();
        }
        this.statements.deinit(bun.default_allocator);
        this.write_buffer.deinit(bun.default_allocator);
        this.read_buffer.deinit(bun.default_allocator);
        this.on_close.deinit();
        this.on_connect.deinit();
        this.backend_parameters.deinit();
        bun.default_allocator.free(this.options_buf);
        bun.default_allocator.destroy(this);
    }

    pub fn disconnect(this: *@This()) void {
        if (this.status == .connected) {
            this.status = .disconnected;
            this.poll_ref.disable();
            this.socket.close();
        }
    }

    fn current(this: *PostgresSQLConnection) ?*PostgresSQLQuery {
        if (this.requests.readableLength() == 0) {
            return null;
        }

        return this.requests.peekItem(0);
    }

    pub const Writer = struct {
        connection: *PostgresSQLConnection,

        pub fn write(this: Writer, data: []const u8) anyerror!void {
            var buffer = &this.connection.write_buffer;
            try buffer.write(bun.default_allocator, data);
        }

        pub fn pwrite(this: Writer, data: []const u8, index: usize) anyerror!void {
            @memcpy(this.connection.write_buffer.byte_list.slice()[index..][0..data.len], data);
        }

        pub fn offset(this: Writer) usize {
            return this.connection.write_buffer.len();
        }
    };

    pub fn writer(this: *PostgresSQLConnection) protocol.NewWriter(Writer) {
        return .{
            .wrapped = .{
                .connection = this,
            },
        };
    }

    pub const Reader = struct {
        connection: *PostgresSQLConnection,

        pub fn markMessageStart(this: Reader) void {
            this.connection.last_message_start = this.connection.read_buffer.head;
        }

        pub const ensureLength = ensureCapacity;

        pub fn peek(this: Reader) []const u8 {
            return this.connection.read_buffer.remaining();
        }
        pub fn skip(this: Reader, count: usize) void {
            this.connection.read_buffer.head = @min(this.connection.read_buffer.head + @as(u32, @truncate(count)), this.connection.read_buffer.byte_list.len);
        }
        pub fn ensureCapacity(this: Reader, count: usize) bool {
            return @as(usize, this.connection.read_buffer.head) + count <= @as(usize, this.connection.read_buffer.byte_list.len);
        }
        pub fn read(this: Reader, count: usize) anyerror!Data {
            var remaining = this.connection.read_buffer.remaining();
            if (@as(usize, remaining.len) < count) {
                return error.ShortRead;
            }

            this.skip(count);
            return Data{
                .temporary = remaining[0..count],
            };
        }
        pub fn readZ(this: Reader) anyerror!Data {
            const remain = this.connection.read_buffer.remaining();

            if (bun.strings.indexOfChar(remain, 0)) |zero| {
                this.skip(zero + 1);
                return Data{
                    .temporary = remain[0..zero],
                };
            }

            return error.ShortRead;
        }
    };

    pub fn bufferedReader(this: *PostgresSQLConnection) protocol.NewReader(Reader) {
        return .{
            .wrapped = .{ .connection = this },
        };
    }

    pub const DataCell = extern struct {
        tag: Tag,

        value: Value,
        free_value: u8 = 0,

        pub const Tag = enum(u8) {
            null = 0,
            string = 1,
            float8 = 2,
            int4 = 3,
            int8 = 4,
            bool = 5,
            date = 6,
            date_with_time_zone = 7,
            bytea = 8,
            json = 9,
            array = 10,
            typed_array = 11,
        };

        pub const Value = extern union {
            null: u8,
            string: bun.WTF.StringImpl,
            float8: f64,
            int4: i32,
            int8: i64,
            bool: u8,
            date: f64,
            date_with_time_zone: f64,
            bytea: [2]usize,
            json: bun.WTF.StringImpl,
            array: Array,
            typed_array: TypedArray,
        };

        pub const Array = extern struct {
            ptr: ?[*]DataCell = null,
            len: u32,

            pub fn slice(this: *Array) []DataCell {
                const ptr = this.ptr orelse return &.{};
                return ptr[0..this.len];
            }
        };
        pub const TypedArray = extern struct {
            head_ptr: ?[*]u8 = null,
            ptr: ?[*]u8 = null,
            len: u32,
            byte_len: u32,
            type: JSValue.JSType,

            pub fn slice(this: *TypedArray) []u8 {
                const ptr = this.ptr orelse return &.{};
                return ptr[0..this.len];
            }

            pub fn byteSlice(this: *TypedArray) []u8 {
                const ptr = this.head_ptr orelse return &.{};
                return ptr[0..this.len];
            }
        };

        pub fn deinit(this: *DataCell) void {
            if (this.free_value == 0) return;

            switch (this.tag) {
                .string => {
                    this.value.string.deref();
                },
                .json => {
                    this.value.json.deref();
                },
                .bytea => {
                    if (this.value.bytea[1] == 0) return;
                    const slice = @as([*]u8, @ptrFromInt(this.value.bytea[0]))[0..this.value.bytea[1]];
                    bun.default_allocator.free(slice);
                },
                .array => {
                    for (this.value.array.slice()) |*cell| {
                        cell.deinit();
                    }
                    bun.default_allocator.free(this.value.array.slice());
                },
                .typed_array => {
                    bun.default_allocator.free(this.value.typed_array.byteSlice());
                },

                else => {},
            }
        }

        pub fn fromBytes(binary: bool, oid: int4, bytes: []const u8, globalObject: *JSC.JSGlobalObject) anyerror!DataCell {
            switch (@as(types.Tag, @enumFromInt(@as(short, @intCast(oid))))) {
                // TODO: .int2_array, .float8_array
                inline .int4_array, .float4_array => |tag| {
                    if (binary) {
                        if (bytes.len < 16) {
                            return error.InvalidBinaryData;
                        }
                        // https://github.com/postgres/postgres/blob/master/src/backend/utils/adt/arrayfuncs.c#L1549-L1645
                        const dimensions_raw: int4 = @bitCast(bytes[0..4].*);
                        const contains_nulls: int4 = @bitCast(bytes[4..8].*);

                        const dimensions = @byteSwap(dimensions_raw);
                        if (dimensions > 1) {
                            return error.MultidimensionalArrayNotSupportedYet;
                        }

                        if (contains_nulls != 0) {
                            return error.NullsInArrayNotSupportedYet;
                        }

                        if (dimensions == 0) {
                            return DataCell{
                                .tag = .typed_array,
                                .value = .{
                                    .typed_array = .{
                                        .ptr = null,
                                        .len = 0,
                                        .byte_len = 0,
                                        .type = tag.toJSTypedArrayType(),
                                    },
                                },
                            };
                        }

                        const elements = tag.pgArrayType().init(bytes).slice();

                        return DataCell{
                            .tag = .typed_array,
                            .value = .{
                                .typed_array = .{
                                    .head_ptr = if (bytes.len > 0) @constCast(bytes.ptr) else null,
                                    .ptr = if (elements.len > 0) @ptrCast(elements.ptr) else null,
                                    .len = @truncate(elements.len),
                                    .byte_len = @truncate(bytes.len),
                                    .type = tag.toJSTypedArrayType(),
                                },
                            },
                        };
                    } else {
                        // TODO:
                        return fromBytes(false, @intFromEnum(types.Tag.bytea), bytes, globalObject);
                    }
                },
                .int4 => {
                    if (binary) {
                        return DataCell{ .tag = .int4, .value = .{ .int4 = try parseBinary(.int4, i32, bytes) } };
                    } else {
                        return DataCell{ .tag = .int4, .value = .{ .int4 = bun.fmt.parseInt(i32, bytes, 0) catch 0 } };
                    }
                },
                .float8 => {
                    if (binary and bytes.len == 8) {
                        return DataCell{ .tag = .float8, .value = .{ .float8 = try parseBinary(.float8, f64, bytes) } };
                    } else {
                        const float8: f64 = bun.parseDouble(bytes) catch std.math.nan(f64);
                        return DataCell{ .tag = .float8, .value = .{ .float8 = float8 } };
                    }
                },
                .float4 => {
                    if (binary and bytes.len == 4) {
                        return DataCell{ .tag = .float8, .value = .{ .float8 = try parseBinary(.float4, f32, bytes) } };
                    } else {
                        const float4: f64 = bun.parseDouble(bytes) catch std.math.nan(f64);
                        return DataCell{ .tag = .float8, .value = .{ .float8 = float4 } };
                    }
                },
                .json => {
                    return DataCell{ .tag = .json, .value = .{ .json = String.createUTF8(bytes).value.WTFStringImpl }, .free_value = 1 };
                },
                .bool => {
                    if (binary) {
                        return DataCell{ .tag = .bool, .value = .{ .bool = @intFromBool(bytes.len > 0 and bytes[0] == 1) } };
                    } else {
                        return DataCell{ .tag = .bool, .value = .{ .bool = @intFromBool(bytes.len > 0 and bytes[0] == 't') } };
                    }
                },
                .timestamp, .timestamptz => |tag| {
                    if (binary and bytes.len == 8) {
                        switch (tag) {
                            .timestamptz => return DataCell{ .tag = .date_with_time_zone, .value = .{ .date_with_time_zone = types.date.fromBinary(bytes) } },
                            .timestamp => return DataCell{ .tag = .date, .value = .{ .date = types.date.fromBinary(bytes) } },
                            else => unreachable,
                        }
                    } else {
                        var str = bun.String.init(bytes);
                        defer str.deref();
                        return DataCell{ .tag = .date, .value = .{ .date = str.parseDate(globalObject) } };
                    }
                },
                .bytea => {
                    if (binary) {
                        return DataCell{ .tag = .bytea, .value = .{ .bytea = .{ @intFromPtr(bytes.ptr), bytes.len } } };
                    } else {
                        if (bun.strings.hasPrefixComptime(bytes, "\\x")) {
                            const hex = bytes[2..];
                            const len = hex.len / 2;
                            const buf = try bun.default_allocator.alloc(u8, len);
                            errdefer bun.default_allocator.free(buf);

                            return DataCell{
                                .tag = .bytea,
                                .value = .{
                                    .bytea = .{
                                        @intFromPtr(buf.ptr),
                                        try bun.strings.decodeHexToBytes(buf, u8, hex),
                                    },
                                },
                                .free_value = 1,
                            };
                        } else {
                            return error.UnsupportedByteaFormat;
                        }
                    }
                },
                else => {
                    return DataCell{ .tag = .string, .value = .{ .string = bun.String.createUTF8(bytes).value.WTFStringImpl }, .free_value = 1 };
                },
            }
        }

        // #define pg_hton16(x)        (x)
        // #define pg_hton32(x)        (x)
        // #define pg_hton64(x)        (x)

        // #define pg_ntoh16(x)        (x)
        // #define pg_ntoh32(x)        (x)
        // #define pg_ntoh64(x)        (x)

        fn pg_ntoT(comptime IntSize: usize, i: anytype) std.meta.Int(.unsigned, IntSize) {
            @setRuntimeSafety(false);
            const T = @TypeOf(i);
            if (@typeInfo(T) == .Array) {
                return pg_ntoT(IntSize, @as(std.meta.Int(.unsigned, IntSize), @bitCast(i)));
            }

            const casted: std.meta.Int(.unsigned, IntSize) = @intCast(i);
            return @byteSwap(casted);
        }
        fn pg_ntoh16(x: anytype) u16 {
            return pg_ntoT(16, x);
        }

        fn pg_ntoh32(x: anytype) u32 {
            return pg_ntoT(32, x);
        }

        pub fn parseBinary(comptime tag: types.Tag, comptime ReturnType: type, bytes: []const u8) anyerror!ReturnType {
            switch (comptime tag) {
                .float8 => {
                    return @as(f64, @bitCast(try parseBinary(.int8, i64, bytes)));
                },
                .int8 => {
                    // pq_getmsgfloat8
                    if (bytes.len != 8) return error.InvalidBinaryData;
                    return @byteSwap(@as(i64, @bitCast(bytes[0..8].*)));
                },
                .int4 => {
                    // pq_getmsgint
                    switch (bytes.len) {
                        1 => {
                            return bytes[0];
                        },
                        2 => {
                            return pg_ntoh16(@as(u16, @bitCast(bytes[0..2].*)));
                        },
                        4 => {
                            return @bitCast(pg_ntoh32(@as(u32, @bitCast(bytes[0..4].*))));
                        },
                        else => {
                            return error.UnsupportedIntegerSize;
                        },
                    }
                },
                .int2 => {
                    // pq_getmsgint
                    switch (bytes.len) {
                        1 => {
                            return bytes[0];
                        },
                        2 => {
                            return pg_ntoh16(@as(u16, @bitCast(bytes[0..2].*)));
                        },
                        else => {
                            return error.UnsupportedIntegerSize;
                        },
                    }
                },
                .float4 => {
                    // pq_getmsgfloat4
                    return @as(f32, @bitCast(try parseBinary(.int4, i32, bytes)));
                },
                else => @compileError("TODO"),
            }
        }

        pub const Putter = struct {
            list: []DataCell,
            fields: []const protocol.FieldDescription,
            binary: bool = false,
            count: usize = 0,
            globalObject: *JSC.JSGlobalObject,

            extern fn JSC__constructObjectFromDataCell(*JSC.JSGlobalObject, JSValue, JSValue, [*]DataCell, u32) JSValue;
            pub fn toJS(this: *Putter, globalObject: *JSC.JSGlobalObject, array: JSValue, structure: JSValue) JSValue {
                return JSC__constructObjectFromDataCell(globalObject, array, structure, this.list.ptr, @truncate(this.fields.len));
            }

            pub fn put(this: *Putter, index: u32, optional_bytes: ?*Data) anyerror!bool {
                const oid = this.fields[index].type_oid;
                debug("index: {d}, oid: {d}", .{ index, oid });

                this.list[index] = if (optional_bytes) |data|
                    try DataCell.fromBytes(this.binary, oid, data.slice(), this.globalObject)
                else
                    DataCell{
                        .tag = .null,
                        .value = .{
                            .null = 0,
                        },
                    };
                this.count += 1;
                return true;
            }
        };
    };

    fn advance(this: *PostgresSQLConnection) !bool {
        defer this.updateRef();
        var any = false;

        while (this.requests.readableLength() > 0) {
            var req: *PostgresSQLQuery = this.requests.peekItem(0);
            switch (req.status) {
                .pending => {
                    const stmt = req.statement orelse return error.ExpectedStatement;
                    if (stmt.status == .failed) {
                        req.onError(stmt.error_response, this.globalObject);
                        this.requests.discard(1);
                        any = true;
                    } else {
                        break;
                    }
                },
                .success, .fail => {
                    this.requests.discard(1);
                    req.deref();
                    any = true;
                },
                else => break,
            }
        }

        while (this.requests.readableLength() > 0) {
            var req: *PostgresSQLQuery = this.requests.peekItem(0);
            const stmt = req.statement orelse return error.ExpectedStatement;

            switch (stmt.status) {
                .prepared => {
                    if (req.status == .pending and stmt.status == .prepared) {
                        const binding_value = PostgresSQLQuery.bindingGetCached(req.thisValue) orelse .zero;
                        const columns_value = PostgresSQLQuery.columnsGetCached(req.thisValue) orelse .zero;
                        PostgresRequest.bindAndExecute(this.globalObject, stmt, binding_value, columns_value, PostgresSQLConnection.Writer, this.writer()) catch |err| {
                            req.onWriteFail(err, this.globalObject);
                            req.deref();
                            this.requests.discard(1);
                            continue;
                        };
                        req.status = .binding;
                        req.binary = stmt.fields.len > 0;
                        any = true;
                    } else {
                        break;
                    }
                },
                else => break,
            }
        }

        return any;
    }

    pub fn on(this: *PostgresSQLConnection, comptime MessageType: @Type(.EnumLiteral), comptime Context: type, reader: protocol.NewReader(Context)) !void {
        debug("on({s})", .{@tagName(MessageType)});
        if (comptime MessageType != .ReadyForQuery) {
            this.is_ready_for_query = false;
        }

        switch (comptime MessageType) {
            .DataRow => {
                const request = this.current() orelse return error.ExpectedRequest;
                var statement = request.statement orelse return error.ExpectedStatement;

                var putter = DataCell.Putter{
                    .list = &.{},
                    .fields = statement.fields,
                    .binary = request.binary,
                    .globalObject = this.globalObject,
                };

                var stack_buf: [64]DataCell = undefined;
                var cells: []DataCell = stack_buf[0..@min(statement.fields.len, stack_buf.len)];
                defer {
                    for (cells[0..putter.count]) |*cell| {
                        cell.deinit();
                    }
                }

                var free_cells = false;
                defer if (free_cells) bun.default_allocator.free(cells);
                if (statement.fields.len >= 64) {
                    cells = try bun.default_allocator.alloc(DataCell, statement.fields.len);
                    free_cells = true;
                }
                putter.list = cells;

                try protocol.DataRow.decode(
                    &putter,
                    Context,
                    reader,
                    DataCell.Putter.put,
                );

                const pending_value = PostgresSQLQuery.pendingValueGetCached(request.thisValue) orelse .zero;
                pending_value.ensureStillAlive();
                const result = putter.toJS(this.globalObject, pending_value, statement.structure(this.js_value, this.globalObject));

                if (pending_value == .zero) {
                    PostgresSQLQuery.pendingValueSetCached(request.thisValue, this.globalObject, result);
                }
            },
            .CopyData => {
                var copy_data: protocol.CopyData = undefined;
                try copy_data.decodeInternal(Context, reader);
                copy_data.data.deinit();
            },
            .ParameterStatus => {
                var parameter_status: protocol.ParameterStatus = undefined;
                try parameter_status.decodeInternal(Context, reader);
                defer {
                    parameter_status.deinit();
                }
                try this.backend_parameters.insert(parameter_status.name.slice(), parameter_status.value.slice());
            },
            .ReadyForQuery => {
                var ready_for_query: protocol.ReadyForQuery = undefined;
                try ready_for_query.decodeInternal(Context, reader);

                if (this.pending_disconnect) {
                    this.disconnect();
                    return;
                }

                this.setStatus(.connected);
                this.is_ready_for_query = true;
                this.socket.setTimeout(300);

                if (try this.advance() or this.is_ready_for_query) {
                    this.flushData();
                }
            },
            .CommandComplete => {
                var request = this.current() orelse return error.ExpectedRequest;

                var cmd: protocol.CommandComplete = undefined;
                try cmd.decodeInternal(Context, reader);
                defer {
                    cmd.deinit();
                }
                debug("-> {s}", .{cmd.command_tag.slice()});
                _ = this.requests.discard(1);
                defer this.updateRef();
                request.onSuccess(cmd.command_tag.slice(), this.globalObject);
            },
            .BindComplete => {
                try reader.eatMessage(protocol.BindComplete);
                var request = this.current() orelse return error.ExpectedRequest;
                if (request.status == .binding) {
                    request.status = .running;
                }
            },
            .ParseComplete => {
                try reader.eatMessage(protocol.ParseComplete);
                const request = this.current() orelse return error.ExpectedRequest;
                if (request.statement) |statement| {
                    if (statement.status == .parsing) {
                        statement.status = .prepared;
                    }
                }
            },
            .ParameterDescription => {
                var description: protocol.ParameterDescription = undefined;
                try description.decodeInternal(Context, reader);
                const request = this.current() orelse return error.ExpectedRequest;
                var statement = request.statement orelse return error.ExpectedStatement;
                statement.parameters = description.parameters;
            },
            .RowDescription => {
                var description: protocol.RowDescription = undefined;
                try description.decodeInternal(Context, reader);
                errdefer description.deinit();
                const request = this.current() orelse return error.ExpectedRequest;
                var statement = request.statement orelse return error.ExpectedStatement;
                statement.fields = description.fields;
            },
            .Authentication => {
                var auth: protocol.Authentication = undefined;
                try auth.decodeInternal(Context, reader);
                defer auth.deinit();

                switch (auth) {
                    .SASL => {
                        if (this.authentication_state != .SASL) {
                            this.authentication_state = .{ .SASL = .{} };
                        }

                        var mechanism_buf: [128]u8 = undefined;
                        const mechanism = std.fmt.bufPrintZ(&mechanism_buf, "n,,n=*,r={s}", .{this.authentication_state.SASL.nonce()}) catch unreachable;
                        var response = protocol.SASLInitialResponse{
                            .mechanism = .{
                                .temporary = "SCRAM-SHA-256",
                            },
                            .data = .{
                                .temporary = mechanism,
                            },
                        };

                        try response.writeInternal(PostgresSQLConnection.Writer, this.writer());
                        debug("SASL", .{});
                        this.flushData();
                    },
                    .SASLContinue => |*cont| {
                        if (this.authentication_state != .SASL) {
                            debug("Unexpected SASLContinue for authentiation state: {s}", .{@tagName(std.meta.activeTag(this.authentication_state))});
                            return error.UnexpectedMessage;
                        }
                        var sasl = &this.authentication_state.SASL;

                        if (sasl.status != .init) {
                            debug("Unexpected SASLContinue for SASL state: {s}", .{@tagName(sasl.status)});
                            return error.UnexpectedMessage;
                        }
                        debug("SASLContinue", .{});

                        const iteration_count = try cont.iterationCount();

                        const server_salt_decoded_base64 = try bun.base64.decodeAlloc(bun.z_allocator, cont.s);
                        defer bun.z_allocator.free(server_salt_decoded_base64);
                        try sasl.computeSaltedPassword(server_salt_decoded_base64, iteration_count, this);

                        const auth_string = try std.fmt.allocPrint(
                            bun.z_allocator,
                            "n=*,r={s},r={s},s={s},i={s},c=biws,r={s}",
                            .{
                                sasl.nonce(),
                                cont.r,
                                cont.s,
                                cont.i,
                                cont.r,
                            },
                        );
                        defer bun.z_allocator.free(auth_string);
                        try sasl.computeServerSignature(auth_string);

                        const client_key = sasl.clientKey();
                        const client_key_signature = sasl.clientKeySignature(&client_key, auth_string);
                        var client_key_xor_buffer: [32]u8 = undefined;
                        for (&client_key_xor_buffer, client_key, client_key_signature) |*out, a, b| {
                            out.* = a ^ b;
                        }

                        var client_key_xor_base64_buf = std.mem.zeroes([bun.base64.encodeLenFromSize(32)]u8);
                        const xor_base64_len = bun.base64.encode(&client_key_xor_base64_buf, &client_key_xor_buffer);

                        const payload = try std.fmt.allocPrint(
                            bun.z_allocator,
                            "c=biws,r={s},p={s}",
                            .{ cont.r, client_key_xor_base64_buf[0..xor_base64_len] },
                        );
                        defer bun.z_allocator.free(payload);

                        var response = protocol.SASLResponse{
                            .data = .{
                                .temporary = payload,
                            },
                        };

                        try response.writeInternal(PostgresSQLConnection.Writer, this.writer());
                        sasl.status = .@"continue";
                        this.flushData();
                    },
                    .SASLFinal => |final| {
                        if (this.authentication_state != .SASL) {
                            debug("SASLFinal - Unexpected SASLContinue for authentiation state: {s}", .{@tagName(std.meta.activeTag(this.authentication_state))});
                            return error.UnexpectedMessage;
                        }
                        var sasl = &this.authentication_state.SASL;

                        if (sasl.status != .@"continue") {
                            debug("SASLFinal - Unexpected SASLContinue for SASL state: {s}", .{@tagName(sasl.status)});
                            return error.UnexpectedMessage;
                        }

                        if (sasl.server_signature_len == 0) {
                            debug("SASLFinal - Server signature is empty", .{});
                            return error.UnexpectedMessage;
                        }

                        const server_signature = sasl.serverSignature();

                        // This will usually start with "v="
                        const comparison_signature = final.data.slice();

                        if (comparison_signature.len < 2 or !bun.strings.eqlLong(server_signature, comparison_signature[2..], true)) {
                            debug("SASLFinal - SASL Server signature mismatch\nExpected: {s}\nActual: {s}", .{ server_signature, comparison_signature[2..] });
                            this.fail("The server did not return the correct signature", error.SASL_SIGNATURE_MISMATCH);
                        } else {
                            debug("SASLFinal - SASL Server signature match", .{});
                            this.authentication_state.zero();
                        }
                    },
                    .Ok => {
                        debug("Authentication OK", .{});
                        this.authentication_state.zero();
                        this.authentication_state = .{ .ok = {} };
                    },

                    .Unknown => {
                        this.fail("Unknown authentication method", error.UNKNOWN_AUTHENTICATION_METHOD);
                    },

                    else => {
                        debug("TODO auth: {s}", .{@tagName(std.meta.activeTag(auth))});
                    },
                }
            },
            .NoData => {
                try reader.eatMessage(protocol.NoData);
                var request = this.current() orelse return error.ExpectedRequest;
                if (request.status == .binding) {
                    request.status = .running;
                }
            },
            .BackendKeyData => {
                try this.backend_key_data.decodeInternal(Context, reader);
            },
            .ErrorResponse => {
                var err: protocol.ErrorResponse = undefined;
                try err.decodeInternal(Context, reader);

                if (this.status == .connecting) {
                    this.status = .failed;
                    defer {
                        err.deinit();
                        this.poll_ref.unref(this.globalObject.bunVM());
                        this.updateHasPendingActivity();
                    }

                    const on_connect = this.on_connect.swap();
                    if (on_connect == .zero) return;
                    const js_value = this.js_value;
                    js_value.ensureStillAlive();
                    this.globalObject.queueMicrotask(on_connect, &[_]JSValue{ err.toJS(this.globalObject), js_value });

                    // it shouldn't enqueue any requests while connecting
                    bun.assert(this.requests.count == 0);
                    return;
                }

                var request = this.current() orelse {
                    debug("ErrorResponse: {}", .{err});
                    return error.ExpectedRequest;
                };
                var is_error_owned = true;
                defer {
                    if (is_error_owned) {
                        err.deinit();
                    }
                }
                if (request.statement) |stmt| {
                    if (stmt.status == PostgresSQLStatement.Status.parsing) {
                        stmt.status = PostgresSQLStatement.Status.failed;
                        stmt.error_response = err;
                        is_error_owned = false;
                        if (this.statements.remove(bun.hash(stmt.signature.name))) {
                            stmt.deref();
                        }
                    }
                }
                _ = this.requests.discard(1);
                this.updateRef();

                request.onError(err, this.globalObject);
            },
            .PortalSuspended => {
                // try reader.eatMessage(&protocol.PortalSuspended);
                // var request = this.current() orelse return error.ExpectedRequest;
                // _ = request;
                // _ = this.requests.discard(1);
                debug("TODO PortalSuspended", .{});
            },
            .CloseComplete => {
                try reader.eatMessage(protocol.CloseComplete);
                var request = this.current() orelse return error.ExpectedRequest;
                _ = this.requests.discard(1);
                request.onSuccess("CLOSECOMPLETE", this.globalObject);
            },
            .CopyInResponse => {
                debug("TODO CopyInResponse", .{});
            },
            .NoticeResponse => {
                debug("UNSUPPORTED NoticeResponse", .{});
                var resp: protocol.NoticeResponse = undefined;

                try resp.decodeInternal(Context, reader);
                resp.deinit();
            },
            .EmptyQueryResponse => {
                try reader.eatMessage(protocol.EmptyQueryResponse);
                var request = this.current() orelse return error.ExpectedRequest;
                _ = this.requests.discard(1);
                this.updateRef();
                request.onSuccess("", this.globalObject);
            },
            .CopyOutResponse => {
                debug("TODO CopyOutResponse", .{});
            },
            .CopyDone => {
                debug("TODO CopyDone", .{});
            },
            .CopyBothResponse => {
                debug("TODO CopyBothResponse", .{});
            },
            else => @compileError("Unknown message type: " ++ @tagName(MessageType)),
        }
    }

    pub fn updateRef(this: *PostgresSQLConnection) void {
        this.updateHasPendingActivity();
        if (this.pending_activity_count.raw > 0) {
            this.poll_ref.ref(this.globalObject.bunVM());
        } else {
            this.poll_ref.unref(this.globalObject.bunVM());
        }
    }

    pub fn doFlush(this: *PostgresSQLConnection, globalObject: *JSC.JSGlobalObject, callframe: *JSC.CallFrame) bun.JSError!JSValue {
        _ = callframe;
        _ = globalObject;
        _ = this;

        return .undefined;
    }

    pub fn createQuery(this: *PostgresSQLConnection, globalObject: *JSC.JSGlobalObject, callframe: *JSC.CallFrame) bun.JSError!JSValue {
        _ = callframe;
        _ = globalObject;
        _ = this;

        return .undefined;
    }

    pub fn getConnected(this: *PostgresSQLConnection, _: *JSC.JSGlobalObject) JSValue {
        return JSValue.jsBoolean(this.status == Status.connected);
    }
};

pub const PostgresSQLStatement = struct {
    cached_structure: JSC.Strong = .{},
    ref_count: u32 = 1,
    fields: []const protocol.FieldDescription = &[_]protocol.FieldDescription{},
    parameters: []const int4 = &[_]int4{},
    signature: Signature,
    status: Status = Status.parsing,
    error_response: protocol.ErrorResponse = .{},

    pub const Status = enum {
        parsing,
        prepared,
        failed,
    };
    pub fn ref(this: *@This()) void {
        bun.assert(this.ref_count > 0);
        this.ref_count += 1;
    }

    pub fn deref(this: *@This()) void {
        const ref_count = this.ref_count;
        this.ref_count -= 1;

        if (ref_count == 1) {
            this.deinit();
        }
    }

    pub fn deinit(this: *PostgresSQLStatement) void {
        debug("PostgresSQLStatement deinit", .{});

        bun.assert(this.ref_count == 0);

        for (this.fields) |*field| {
            @constCast(field).deinit();
        }
        bun.default_allocator.free(this.fields);
        bun.default_allocator.free(this.parameters);
        this.cached_structure.deinit();
        this.error_response.deinit();
        this.signature.deinit();
        bun.default_allocator.destroy(this);
    }

    pub fn structure(this: *PostgresSQLStatement, owner: JSValue, globalObject: *JSC.JSGlobalObject) JSValue {
        return this.cached_structure.get() orelse {
            const names = bun.default_allocator.alloc(bun.String, this.fields.len) catch return .undefined;
            defer {
                for (names) |*name| {
                    name.deref();
                }
                bun.default_allocator.free(names);
            }
            for (this.fields, names) |*field, *name| {
                name.* = String.fromUTF8(field.name.slice());
            }
            const structure_ = JSC.JSObject.createStructure(
                globalObject,
                owner,
                @truncate(this.fields.len),
                names.ptr,
            );
            this.cached_structure.set(globalObject, structure_);
            return structure_;
        };
    }
};

const QueryBindingIterator = union(enum) {
    array: JSC.JSArrayIterator,
    objects: ObjectIterator,

    pub fn init(array: JSValue, columns: JSValue, globalObject: *JSC.JSGlobalObject) QueryBindingIterator {
        if (columns.isEmptyOrUndefinedOrNull()) {
            return .{ .array = JSC.JSArrayIterator.init(array, globalObject) };
        }

        return .{
            .objects = .{
                .array = array,
                .columns = columns,
                .globalObject = globalObject,
                .columns_count = columns.getLength(globalObject),
                .array_length = array.getLength(globalObject),
            },
        };
    }

    pub const ObjectIterator = struct {
        array: JSValue,
        columns: JSValue = .zero,
        globalObject: *JSC.JSGlobalObject,
        cell_i: usize = 0,
        row_i: usize = 0,
        current_row: JSC.JSValue = .zero,
        columns_count: usize = 0,
        array_length: usize = 0,
        any_failed: bool = false,

        pub fn next(this: *ObjectIterator) ?JSC.JSValue {
            if (this.row_i >= this.array_length) {
                return null;
            }

            const cell_i = this.cell_i;
            this.cell_i += 1;
            const row_i = this.row_i;

            const globalObject = this.globalObject;

            if (this.current_row == .zero) {
                this.current_row = JSC.JSObject.getIndex(this.array, globalObject, @intCast(row_i));
                if (this.current_row.isEmptyOrUndefinedOrNull()) {
                    if (!globalObject.hasException())
                        globalObject.throw("Expected a row to be returned at index {d}", .{row_i});
                    this.any_failed = true;
                    return null;
                }
            }

            defer {
                if (this.cell_i >= this.columns_count) {
                    this.cell_i = 0;
                    this.current_row = .zero;
                    this.row_i += 1;
                }
            }

            const property = JSC.JSObject.getIndex(this.columns, globalObject, @intCast(cell_i));
            if (property == .zero or property == .undefined) {
                if (!globalObject.hasException())
                    globalObject.throw("Expected a column at index {d} in row {d}", .{ cell_i, row_i });
                this.any_failed = true;
                return null;
            }

            const value = this.current_row.getOwnByValue(globalObject, property);
            if (value == .zero or value == .undefined) {
                if (!globalObject.hasException())
                    globalObject.throw("Expected a value at index {d} in row {d}", .{ cell_i, row_i });
                this.any_failed = true;
                return null;
            }
            return value;
        }
    };

    pub fn next(this: *QueryBindingIterator) ?JSC.JSValue {
        return switch (this.*) {
            .array => |*iter| iter.next(),
            .objects => |*iter| iter.next(),
        };
    }

    pub fn anyFailed(this: *const QueryBindingIterator) bool {
        return switch (this.*) {
            .array => false,
            .objects => |*iter| iter.any_failed,
        };
    }

    pub fn to(this: *QueryBindingIterator, index: u32) void {
        switch (this.*) {
            .array => |*iter| iter.i = index,
            .objects => |*iter| {
                iter.cell_i = index % iter.columns_count;
                iter.row_i = index / iter.columns_count;
                iter.current_row = .zero;
            },
        }
    }

    pub fn reset(this: *QueryBindingIterator) void {
        switch (this.*) {
            .array => |*iter| {
                iter.i = 0;
            },
            .objects => |*iter| {
                iter.cell_i = 0;
                iter.row_i = 0;
                iter.current_row = .zero;
            },
        }
    }
};

const Signature = struct {
    fields: []const int4,
    name: []const u8,
    query: []const u8,

    pub fn deinit(this: *Signature) void {
        bun.default_allocator.free(this.fields);
        bun.default_allocator.free(this.name);
        bun.default_allocator.free(this.query);
    }

    pub fn hash(this: *const Signature) u64 {
        var hasher = std.hash.Wyhash.init(0);
        hasher.update(this.name);
        hasher.update(std.mem.sliceAsBytes(this.fields));
        return hasher.final();
    }

    pub fn generate(globalObject: *JSC.JSGlobalObject, query: []const u8, array_value: JSValue, columns: JSValue) !Signature {
        var fields = std.ArrayList(int4).init(bun.default_allocator);
        var name = try std.ArrayList(u8).initCapacity(bun.default_allocator, query.len);

        name.appendSliceAssumeCapacity(query);

        errdefer {
            fields.deinit();
            name.deinit();
        }

        var iter = QueryBindingIterator.init(array_value, columns, globalObject);

        while (iter.next()) |value| {
            if (value.isEmptyOrUndefinedOrNull()) {
                // Allow postgres to decide the type
                try fields.append(0);
                try name.appendSlice(".null");
                continue;
            }

            const tag = try types.Tag.fromJS(globalObject, value);

            switch (tag) {
                .int8 => try name.appendSlice(".int8"),
                .int4 => try name.appendSlice(".int4"),
                // .int4_array => try name.appendSlice(".int4_array"),
                .int2 => try name.appendSlice(".int2"),
                .float8 => try name.appendSlice(".float8"),
                .float4 => try name.appendSlice(".float4"),
                .numeric => try name.appendSlice(".numeric"),
                .json => try name.appendSlice(".json"),
                .bool => try name.appendSlice(".bool"),
                .timestamp => try name.appendSlice(".timestamp"),
                .timestamptz => try name.appendSlice(".timestamptz"),
                .bytea => try name.appendSlice(".bytea"),
                else => try name.appendSlice(".string"),
            }

            switch (tag) {
                .bool, .int4, .int8, .float8, .int2, .numeric, .float4, .bytea => {
                    // We decide the type
                    try fields.append(@intFromEnum(tag));
                },
                else => {
                    // Allow postgres to decide the type
                    try fields.append(0);
                },
            }
        }

        if (iter.anyFailed()) {
            return error.InvalidQueryBinding;
        }

        return Signature{
            .name = name.items,
            .fields = fields.items,
            .query = try bun.default_allocator.dupe(u8, query),
        };
    }
};

pub fn createBinding(globalObject: *JSC.JSGlobalObject) JSValue {
    const binding = JSValue.createEmptyObjectWithNullPrototype(globalObject);
    binding.put(globalObject, ZigString.static("PostgresSQLConnection"), PostgresSQLConnection.getConstructor(globalObject));
    binding.put(globalObject, ZigString.static("init"), JSC.JSFunction.create(globalObject, "init", PostgresSQLContext.init, 0, .{}));
    binding.put(
        globalObject,
        ZigString.static("createQuery"),
        JSC.JSFunction.create(globalObject, "createQuery", PostgresSQLQuery.call, 2, .{}),
    );

    binding.put(
        globalObject,
        ZigString.static("createConnection"),
        JSC.JSFunction.create(globalObject, "createQuery", PostgresSQLConnection.call, 2, .{}),
    );

    return binding;
}

const ZigString = JSC.ZigString;

const assert = bun.assert;