name: Update highway

on:
  schedule:
    - cron: "0 4 * * 0"
  workflow_dispatch:

jobs:
  check-update:
    runs-on: ubuntu-latest
    permissions:
      contents: write
      pull-requests: write

    steps:
      - uses: actions/checkout@v4

      - name: Check highway version
        id: check-version
        run: |
          set -euo pipefail

          # Extract the commit hash from the line after COMMIT
          CURRENT_VERSION=$(awk '/[[:space:]]*COMMIT[[:space:]]*$/{getline; gsub(/^[[:space:]]+|[[:space:]]+$/,"",$0); print}' cmake/targets/BuildHighway.cmake)

          if [ -z "$CURRENT_VERSION" ]; then
            echo "Error: Could not find COMMIT line in BuildHighway.cmake"
            exit 1
          fi

          # Validate that it looks like a git hash
          if ! [[ $CURRENT_VERSION =~ ^[0-9a-f]{40}$ ]]; then
            echo "Error: Invalid git hash format in BuildHighway.cmake"
            echo "Found: $CURRENT_VERSION"
            echo "Expected: 40 character hexadecimal string"
            exit 1
          fi

          echo "current=$CURRENT_VERSION" >> $GITHUB_OUTPUT

          LATEST_RELEASE=$(curl -sL https://api.github.com/repos/google/highway/releases/latest)
          if [ -z "$LATEST_RELEASE" ]; then
            echo "Error: Failed to fetch latest release from GitHub API"
            exit 1
          fi

          LATEST_TAG=$(echo "$LATEST_RELEASE" | jq -r '.tag_name')
          if [ -z "$LATEST_TAG" ] || [ "$LATEST_TAG" = "null" ]; then
            echo "Error: Could not extract tag name from GitHub API response"
            exit 1
          fi

          TAG_REF=$(curl -sL "https://api.github.com/repos/google/highway/git/refs/tags/$LATEST_TAG")
          if [ -z "$TAG_REF" ]; then
            echo "Error: Could not fetch tag reference for $LATEST_TAG"
            exit 1
          fi

          TAG_OBJECT_SHA=$(echo "$TAG_REF" | jq -r '.object.sha')
          TAG_OBJECT_TYPE=$(echo "$TAG_REF" | jq -r '.object.type')

          if [ -z "$TAG_OBJECT_SHA" ] || [ "$TAG_OBJECT_SHA" = "null" ]; then
            echo "Error: Could not fetch SHA for tag $LATEST_TAG"
            exit 1
          fi

          # Handle both lightweight tags (type: commit) and annotated tags (type: tag)
          if [ "$TAG_OBJECT_TYPE" = "commit" ]; then
            # Lightweight tag - object.sha is already the commit SHA
            LATEST_SHA="$TAG_OBJECT_SHA"
          elif [ "$TAG_OBJECT_TYPE" = "tag" ]; then
            # Annotated tag - need to fetch the tag object to get the commit SHA
            LATEST_SHA=$(curl -sL "https://api.github.com/repos/google/highway/git/tags/$TAG_OBJECT_SHA" | jq -r '.object.sha')
            if [ -z "$LATEST_SHA" ] || [ "$LATEST_SHA" = "null" ]; then
              echo "Error: Could not fetch commit SHA for annotated tag $LATEST_TAG @ $TAG_OBJECT_SHA"
              exit 1
            fi
          else
            echo "Error: Unexpected tag object type: $TAG_OBJECT_TYPE"
            exit 1
          fi

          if ! [[ $LATEST_SHA =~ ^[0-9a-f]{40}$ ]]; then
            echo "Error: Invalid SHA format received from GitHub"
            echo "Found: $LATEST_SHA"
            echo "Expected: 40 character hexadecimal string"
            exit 1
          fi

          echo "latest=$LATEST_SHA" >> $GITHUB_OUTPUT
          echo "tag=$LATEST_TAG" >> $GITHUB_OUTPUT

      - name: Update version if needed
        if: success() && steps.check-version.outputs.current != steps.check-version.outputs.latest
        run: |
          set -euo pipefail
          # Handle multi-line format where COMMIT and its value are on separate lines
          sed -i -E '/[[:space:]]*COMMIT[[:space:]]*$/{n;s/[[:space:]]*([0-9a-f]+)[[:space:]]*$/    ${{ steps.check-version.outputs.latest }}/}' cmake/targets/BuildHighway.cmake

      - name: Create Pull Request
        if: success() && steps.check-version.outputs.current != steps.check-version.outputs.latest
        uses: peter-evans/create-pull-request@v7
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          add-paths: |
            cmake/targets/BuildHighway.cmake
          commit-message: "deps: update highway to ${{ steps.check-version.outputs.tag }} (${{ steps.check-version.outputs.latest }})"
          title: "deps: update highway to ${{ steps.check-version.outputs.tag }}"
          delete-branch: true
          branch: deps/update-highway
          body: |
            ## What does this PR do?

            Updates highway to version ${{ steps.check-version.outputs.tag }}

            Compare: https://github.com/google/highway/compare/${{ steps.check-version.outputs.current }}...${{ steps.check-version.outputs.latest }}

            Auto-updated by [this workflow](https://github.com/oven-sh/bun/actions/workflows/update-highway.yml)