name: Sync sglang submodule

on:
  schedule:
    # Run daily at 08:00 UTC
    - cron: "0 8 * * *"
  workflow_dispatch:

permissions:
  contents: write
  pull-requests: write

jobs:
  sync:
    name: Check for sglang-kt updates
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          submodules: true
          fetch-depth: 0
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Update sglang submodule to latest main
        id: update
        run: |
          OLD_SHA=$(git -C third_party/sglang rev-parse HEAD)
          git submodule update --remote third_party/sglang
          NEW_SHA=$(git -C third_party/sglang rev-parse HEAD)

          echo "old_sha=$OLD_SHA" >> "$GITHUB_OUTPUT"
          echo "new_sha=$NEW_SHA" >> "$GITHUB_OUTPUT"

          if [ "$OLD_SHA" = "$NEW_SHA" ]; then
            echo "changed=false" >> "$GITHUB_OUTPUT"
            echo "sglang submodule is already up to date ($OLD_SHA)"
          else
            echo "changed=true" >> "$GITHUB_OUTPUT"

            # Collect commit log between old and new
            COMMITS=$(git -C third_party/sglang log --oneline "$OLD_SHA..$NEW_SHA" | head -20)
            echo "commits<<EOF" >> "$GITHUB_OUTPUT"
            echo "$COMMITS" >> "$GITHUB_OUTPUT"
            echo "EOF" >> "$GITHUB_OUTPUT"

            # sglang-kt version = ktransformers version (from version.py)
            VERSION=$(python3 -c "exec(open('version.py').read()); print(__version__)" 2>/dev/null || echo "unknown")
            echo "version=$VERSION" >> "$GITHUB_OUTPUT"

            echo "sglang submodule updated: $OLD_SHA -> $NEW_SHA (v$VERSION)"
          fi

      - name: Create pull request
        if: steps.update.outputs.changed == 'true'
        uses: peter-evans/create-pull-request@v6
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          commit-message: |
            [build]: sync sglang submodule to ${{ steps.update.outputs.new_sha }}
          branch: auto/sync-sglang
          delete-branch: true
          title: "[build] Sync sglang-kt submodule (v${{ steps.update.outputs.version }})"
          body: |
            Automated sync of `third_party/sglang` submodule to latest `main`.

            **Old ref:** `${{ steps.update.outputs.old_sha }}`
            **New ref:** `${{ steps.update.outputs.new_sha }}`
            **sglang-kt version:** `${{ steps.update.outputs.version }}`

            ### Commits included
            ```
            ${{ steps.update.outputs.commits }}
            ```

            ---
            *This PR was created automatically by the [sync-sglang-submodule](${{ github.server_url }}/${{ github.repository }}/actions/workflows/sync-sglang-submodule.yml) workflow.*
          labels: |
            dependencies
            automated