auto-merge.yml

name: 'Auto Merge Approved PRs'

on:
  pull_request_review:
    types: [ submitted ]

jobs:
  auto_merge:
    runs-on: ubuntu-latest
    steps:
      - name: 'Get Pull Request'
        id: pr
        uses: actions/github-script@v6
        with:
          result-encoding: string
          script: |
            const { data: pr } = await github.rest.pulls.get({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: context.payload.pull_request.number,
            });
            return JSON.stringify(pr);

      - name: 'Check Approvals and Labels'
        id: check
        uses: actions/github-script@v6
        with:
          script: |
            const pr = JSON.parse(steps.pr.outputs.result);
            const reviews = await github.rest.pulls.listReviews({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: pr.number,
            });
            const approvals = reviews.data.filter(review => review.state === 'APPROVED');
            const hasLabel = pr.labels.some(label => label.name === '확인 요청');

            // 메인 브랜치로 향하는 PR인 경우 리뷰어 3명, 다른 브랜치인 경우 2명 필요
            const requiredApprovals = pr.base.ref === 'main' ? 3 : 2;
            return approvals.length >= requiredApprovals && hasLabel;

      - name: 'Change Label to 작업 완료'
        if: steps.check.outputs.result == 'true'
        uses: actions-ecosystem/action-add-labels@v1
        with:
          labels: '작업 완료'
          github_token: ${{ secrets.GITHUB_TOKEN }}

      - name: 'Remove Label 확인 요청'
        if: steps.check.outputs.result == 'true'
        uses: actions-ecosystem/action-remove-labels@v1
        with:
          labels: '확인 요청'
          github_token: ${{ secrets.GITHUB_TOKEN }}

      - name: 'Merge PR'
        if: steps.check.outputs.result == 'true'
        uses: actions/github-script@v6
        with:
          script: |
            await github.rest.pulls.merge({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: context.payload.pull_request.number,
              merge_method: 'merge', # 'squash' 또는 'rebase'로도 설정 가능
              commit_title: `자동 머지: PR #${context.payload.pull_request.number}`
            });