name: check-pr
on:
  pull_request_target:
    types: [opened, synchronize]
jobs:
  aictl-review:
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
    steps:
      - name: Get number of commits for fetch depth
        run: echo "fetch_depth=$(( commits + 1 ))" >> $GITHUB_ENV
        env:
          commits: ${{ github.event.pull_request.commits }}
      - name: Git checkout until fetch-depth
        uses: actions/checkout@v4
        with:
          fetch-depth: ${{ env.fetch_depth }}
          # need to specify ref to fetch PR head, otherwise you get main branch with no HEAD
          ref: ${{ github.event.pull_request.head.sha }}
      - name: Fetch base branch as origin
        run: git fetch origin ${{ github.event.pull_request.base.ref }}
      - name: Get the diff between PR and origin branch and get commit message too
        id: git-diff
        run: |
          # If fetch-depth is not specified in checkout, HEAD cannot be found
          # Make sure to filter out deleted file in `git diff` since you cannot review deleted files
          diff_files=$(git diff --name-only --diff-filter=ACMR origin/${{ github.event.pull_request.base.ref }}..HEAD | tr '\n' ',' | sed 's/,$/\n/')
          echo "diff_files: ${diff_files}"
          echo "diff-files=${diff_files}" >> "$GITHUB_OUTPUT"

          # In PR, you cannot get `github.event.head_commit.message` so you need to get commit message via git log
          commit_msg=$(git log --format=%B -n 1 ${{ github.event.pull_request.head.sha }})
          echo "commit_msg: ${commit_msg}"
          echo "commit-msg=${commit_msg}" >> "$GITHUB_OUTPUT"           
      - name: Run aictl for code review
        id: aictl-review
        uses: go-zen-chu/aictl@main
        if: ${{ steps.git-diff.outputs.diff-files != '' && !contains(steps.git-diff.outputs.commit-msg, '[skip ai]') }}
        with:
          query: |
            Markdown ファイルはプログラミングなどの技術記事、ライフハック記事や書評などを記載しています。
            より読みやすく、多くの人に読んでもらえるようにする観点でレビューをお願いします。

            その他ファイルは、このブログシステム自体のソースコードになります。
            より良いブログシステムを構築できるように、コードの品質や保守性の観点でレビューをお願いします。            
          language: 日本語
          text-files: ${{ steps.git-diff.outputs.diff-files }}
        env:
          AICTL_OPENAI_API_KEY: ${{ secrets.AICTL_OPENAI_API_KEY }}
      - name: Post aictl review result to PR comment
        if: steps.aictl-review.outcome != 'skipped'
        run: |
          # make sure to checkout to pr branch and resolve detached HEAD state
          git checkout ${{ github.ref_name }}
          # TIPS: surrounding with single quote, you can ignore `code` string in outputs
          cat <<'AICTL_REVIEW_EOF' > response.md
          ${{ steps.aictl-review.outputs.response }}
          AICTL_REVIEW_EOF
          gh pr comment --body-file response.md "${URL}"          
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          URL: ${{ github.event.pull_request.html_url }}