create-release-pr.yml

name: Create Release PR

on:
  push:
    branches: [ develop ]

permissions:
  contents: write
  pull-requests: write

jobs:
  create-release-pr:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Check for existing release PR
        id: check
        run: |
          EXISTING_PR=$(gh pr list --base main --head develop --state open --json number -q '.[0].number' 2>/dev/null || echo "")
          echo "existing_pr=$EXISTING_PR" >> "$GITHUB_OUTPUT"
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Generate changelog
        run: |
          LAST_TAG=$(git describe --tags --abbrev=0 2>/dev/null || echo "")
          if [ -n "$LAST_TAG" ]; then
            LOG=$(git log "${LAST_TAG}..HEAD" --pretty=format:"- %s" --no-merges || true)
          else
            MAIN_HEAD=$(git rev-parse origin/main 2>/dev/null || echo "")
            if [ -n "$MAIN_HEAD" ]; then
              LOG=$(git log "origin/main..HEAD" --pretty=format:"- %s" --no-merges || true)
            else
              LOG=$(git log --pretty=format:"- %s" --no-merges -20 || true)
            fi
          fi

          # Always write to a fixed temp file. Never pass arbitrary commit
          # messages through GITHUB_OUTPUT or expression interpolation.
          printf '%s\n' "$LOG" > /tmp/release-changelog.txt

      - name: Build PR body
        run: |
          # Build the PR body using only hardcoded paths. This guarantees
          # the workflow file itself never contains expression syntax inside
          # a run: block (the cause of previous "An expression was expected" errors).
          {
            echo "## Release: develop → main"
            echo ""
            echo "develop 브랜치의 변경사항을 main으로 배포합니다."
            echo "버전은 main 머지 시점에 자동으로 확정됩니다."
            echo ""
            echo "### Changes"
            if [ -f /tmp/release-changelog.txt ]; then
              cat /tmp/release-changelog.txt
            fi
          } > /tmp/release-pr-body.txt

      - name: Update existing PR
        if: steps.check.outputs.existing_pr != ''
        run: |
          gh pr edit ${{ steps.check.outputs.existing_pr }} \
            --title "release: develop → main" \
            --body-file /tmp/release-pr-body.txt
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Create release PR
        id: create
        if: steps.check.outputs.existing_pr == ''
        run: |
          PR_URL=$(gh pr create \
            --base main \
            --head develop \
            --title "release: develop → main" \
            --body-file /tmp/release-pr-body.txt \
            --label release)
          PR_NUMBER=$(echo "$PR_URL" | grep -oE '[0-9]+$')
          echo "pr_number=$PR_NUMBER" >> "$GITHUB_OUTPUT"
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Add reviewers
        if: steps.create.outputs.pr_number != ''
        run: |
          gh api repos/${{ github.repository }}/pulls/${{ steps.create.outputs.pr_number }}/requested_reviewers \
            --method POST \
            -f "reviewers[]=Junhyukkkk" -f "reviewers[]=KII1ua" -f "reviewers[]=tlarbals824" || echo "Failed to add reviewers"
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}