name: Claude Code

on:
  issue_comment:
    types: [created]
  pull_request_review_comment:
    types: [created]
  issues:
    types: [opened, assigned]
  pull_request_review:
    types: [submitted]

jobs:
  claude:
    if: |
      (github.event_name == 'issue_comment' && contains(github.event.comment.body, '@claude')) ||
      (github.event_name == 'pull_request_review_comment' && contains(github.event.comment.body, '@claude')) ||
      (github.event_name == 'pull_request_review' && contains(github.event.review.body, '@claude')) ||
      (github.event_name == 'issues' && (contains(github.event.issue.body, '@claude') || contains(github.event.issue.title, '@claude')))
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: read
      issues: read
      id-token: write
      actions: read # Required for Claude to read CI results on PRs
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 1

      # Workaround for claude-code-action bug with fork PRs: The action fetches by branch name
      # (git fetch origin --depth=N <branch>), but fork PR branches don't exist on origin.
      # Fix: redirect origin to the fork's URL so the action can fetch the branch directly.
      - name: Configure git remote for fork PRs
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          # Determine PR number based on event type
          if [ "${{ github.event_name }}" = "issue_comment" ]; then
            PR_NUMBER="${{ github.event.issue.number }}"
          elif [ "${{ github.event_name }}" = "pull_request_review_comment" ] || [ "${{ github.event_name }}" = "pull_request_review" ]; then
            PR_NUMBER="${{ github.event.pull_request.number }}"
          else
            exit 0  # issues event — no PR branch to worry about
          fi

          # Fetch fork info in one API call; silently skip if this is not a PR
          PR_INFO=$(gh pr view "${PR_NUMBER}" --json isCrossRepository,headRepositoryOwner,headRepository 2>/dev/null || echo "")
          if [ -z "$PR_INFO" ]; then
            exit 0
          fi

          IS_FORK=$(echo "$PR_INFO" | jq -r '.isCrossRepository')
          if [ "$IS_FORK" = "true" ]; then
            FORK_OWNER=$(echo "$PR_INFO" | jq -r '.headRepositoryOwner.login')
            FORK_REPO=$(echo "$PR_INFO" | jq -r '.headRepository.name')
            echo "Fork PR detected from ${FORK_OWNER}/${FORK_REPO}: updating origin to fork URL"
            git remote set-url origin "https://github.com/${FORK_OWNER}/${FORK_REPO}.git"
          fi

      - name: Run Claude Code
        id: claude
        uses: anthropics/claude-code-action@e763fe78de2db7389e04818a00b5ff8ba13d1360 # v1
        with:
          claude_code_oauth_token: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}

          # This is an optional setting that allows Claude to read CI results on PRs
          additional_permissions: |
            actions: read

          # Optional: Give a custom prompt to Claude. If this is not specified, Claude will perform the instructions specified in the comment that tagged it.
          # prompt: 'Update the pull request description to include a summary of changes.'

          # Optional: Add claude_args to customize behavior and configuration
          # See https://github.com/anthropics/claude-code-action/blob/main/docs/usage.md
          # or https://code.claude.com/docs/en/cli-reference for available options
          # claude_args: '--allowed-tools Bash(gh pr:*)'