pr-automation.yml

name: PR Automation

on:
  pull_request:
    types: [opened, reopened]

permissions:
  pull-requests: write
  contents: read

jobs:
  pr-automation:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v6

      - name: Get changed files
        id: changed-files
        run: |
          # Get list of changed files
          FILES=$(gh pr diff "$PR_NUMBER" --name-only)
          echo "files<<EOF" >> $GITHUB_OUTPUT
          echo "$FILES" >> $GITHUB_OUTPUT
          echo "EOF" >> $GITHUB_OUTPUT
        env:
          PR_NUMBER: ${{ github.event.pull_request.number }}
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Auto-label based on files
        run: |
          PR_NUMBER=${{ github.event.pull_request.number }}
          FILES="${{ steps.changed-files.outputs.files }}"

          # Area labels based on file paths
          if echo "$FILES" | grep -q "^src/api/\|^api/"; then
            gh pr edit "$PR_NUMBER" --add-label "area:api" || true
          fi

          if echo "$FILES" | grep -q "^src/frontend/\|^components/\|^ui/"; then
            gh pr edit "$PR_NUMBER" --add-label "area:frontend" || true
          fi

          if echo "$FILES" | grep -q "^src/backend/\|^server/"; then
            gh pr edit "$PR_NUMBER" --add-label "area:backend" || true
          fi

          if echo "$FILES" | grep -q "^docs/\|\.md$"; then
            gh pr edit "$PR_NUMBER" --add-label "area:docs" || true
          fi

          if echo "$FILES" | grep -q "^tests/\|^test/"; then
            gh pr edit "$PR_NUMBER" --add-label "area:tests" || true
          fi

          # Check for breaking changes in commits
          COMMITS=$(gh api repos/${{ github.repository }}/pulls/$PR_NUMBER/commits --jq '.[].commit.message' | grep -i "BREAKING CHANGE" || true)
          if [ -n "$COMMITS" ]; then
            gh pr edit "$PR_NUMBER" --add-label "type:breaking" || true
          fi

          # Documentation only
          if echo "$FILES" | grep -v "^docs/\|\.md$" | grep -q .; then
            :
          else
            gh pr edit "$PR_NUMBER" --add-label "documentation" || true
          fi
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Auto-assign reviewers based on files
        run: |
          PR_NUMBER=${{ github.event.pull_request.number }}
          FILES="${{ steps.changed-files.outputs.files }}"

          # Assign reviewers based on code areas
          if echo "$FILES" | grep -q "^src/frontend/\|^components/\|^ui/"; then
            gh pr edit "$PR_NUMBER" --add-reviewer "frontend-team" || true
          fi

          if echo "$FILES" | grep -q "^src/backend/\|^server/"; then
            gh pr edit "$PR_NUMBER" --add-reviewer "backend-team" || true
          fi

          if echo "$FILES" | grep -q "^src/api/\|^api/"; then
            gh pr edit "$PR_NUMBER" --add-reviewer "api-team" || true
          fi

          if echo "$FILES" | grep -q "^infra/\|^deploy/\|^\.github/"; then
            gh pr edit "$PR_NUMBER" --add-reviewer "devops-team" || true
          fi
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Welcome first-time contributors
        run: |
          PR_NUMBER=${{ github.event.pull_request.number }}
          AUTHOR=${{ github.event.pull_request.user.login }}

          # Check if this is the author's first PR
          PR_COUNT=$(gh pr list --author "$AUTHOR" --state all --limit 1 --json number --jq 'length')

          if [ "$PR_COUNT" -eq 1 ]; then
            gh pr edit "$PR_NUMBER" --add-label "first-time-contributor" || true

            gh pr comment "$PR_NUMBER" --body '## Welcome! 👋

            Thank you for your first contribution to this project! We appreciate you taking the time to improve our codebase.

            ### Next Steps
            - A maintainer will review your PR shortly
            - Please check for any review comments and address them
            - Feel free to ask questions if anything is unclear

            ### Contribution Guidelines
            - Ensure all tests pass
            - Update documentation if needed
            - Keep changes focused and atomic

            Thanks again for contributing! 🎉'
          fi
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}