from collections import namedtuple
from typing import List
import pytest
from isledecomp.parser.util import (
    is_blank_or_comment,
    match_offset_comment,
    is_exact_offset_comment,
    distinct_by_module,
)


blank_or_comment_param = [
    (True, ""),
    (True, "\t"),
    (True, "    "),
    (False, "\tint abc=123;"),
    (True, "// OFFSET: LEGO1 0xdeadbeef"),
    (True, "   /* Block comment beginning"),
    (True, "Block comment ending */   "),
    # TODO: does clang-format have anything to say about these cases?
    (False, "x++; // Comment folows"),
    (False, "x++; /* Block comment begins"),
]


@pytest.mark.parametrize("expected, line", blank_or_comment_param)
def test_is_blank_or_comment(line: str, expected: bool):
    assert is_blank_or_comment(line) is expected


offset_comment_samples = [
    # (can_parse: bool, exact_match: bool, line: str)
    # Should match both expected modules with optional STUB marker
    (True, True, "// OFFSET: LEGO1 0xdeadbeef"),
    (True, True, "// OFFSET: LEGO1 0xdeadbeef STUB"),
    (True, True, "// OFFSET: ISLE 0x12345678"),
    (True, True, "// OFFSET: ISLE 0x12345678 STUB"),
    # No trailing spaces allowed
    (True, False, "// OFFSET: LEGO1 0xdeadbeef  "),
    (True, False, "// OFFSET: LEGO1 0xdeadbeef STUB "),
    # Must have exactly one space between elements
    (True, False, "//OFFSET: ISLE 0xdeadbeef"),
    (True, False, "// OFFSET:ISLE 0xdeadbeef"),
    (True, False, "//  OFFSET: ISLE 0xdeadbeef"),
    (True, False, "// OFFSET:  ISLE 0xdeadbeef"),
    (True, False, "// OFFSET: ISLE  0xdeadbeef"),
    (True, False, "// OFFSET: ISLE 0xdeadbeef  STUB"),
    # Must have 0x prefix for hex number
    (True, False, "// OFFSET: ISLE deadbeef"),
    # Offset, module name, and STUB must be uppercase
    (True, False, "// offset: ISLE 0xdeadbeef"),
    (True, False, "// offset: isle 0xdeadbeef"),
    (True, False, "// OFFSET: LEGO1 0xdeadbeef stub"),
    # Hex string must be lowercase
    (True, False, "// OFFSET: ISLE 0xDEADBEEF"),
    # TODO: How flexible should we be with matching the module name?
    (True, True, "// OFFSET: OMNI 0x12345678"),
    (True, True, "// OFFSET: LEG01 0x12345678"),
    (True, False, "// OFFSET: hello 0x12345678"),
    # Not close enough to match
    (False, False, "// OFFSET: ISLE0x12345678"),
    (False, False, "// OFFSET: 0x12345678"),
    (False, False, "// LEGO1: 0x12345678"),
    # Hex string shorter than 8 characters
    (True, True, "// OFFSET: LEGO1 0x1234"),
    # TODO: These match but shouldn't.
    # (False, False, '// OFFSET: LEGO1 0'),
    # (False, False, '// OFFSET: LEGO1 0x'),
]


@pytest.mark.parametrize("match, _, line", offset_comment_samples)
def test_offset_match(line: str, match: bool, _):
    did_match = match_offset_comment(line) is not None
    assert did_match is match


@pytest.mark.parametrize("_, exact, line", offset_comment_samples)
def test_exact_offset_comment(line: str, exact: bool, _):
    assert is_exact_offset_comment(line) is exact


# Helper for the next test: cut down version of OffsetMatch
MiniOfs = namedtuple("MiniOfs", ["module", "value"])

distinct_by_module_samples = [
    # empty set
    ([], []),
    # same module name
    ([MiniOfs("TEST", 123), MiniOfs("TEST", 555)], [MiniOfs("TEST", 123)]),
    # same module name, case-insensitive
    ([MiniOfs("test", 123), MiniOfs("TEST", 555)], [MiniOfs("test", 123)]),
    # duplicates, non-consecutive
    (
        [MiniOfs("test", 123), MiniOfs("abc", 111), MiniOfs("TEST", 555)],
        [MiniOfs("test", 123), MiniOfs("abc", 111)],
    ),
]


@pytest.mark.parametrize("sample, expected", distinct_by_module_samples)
def test_distinct_by_module(sample: List[MiniOfs], expected: List[MiniOfs]):
    assert distinct_by_module(sample) == expected