name: Sync stable CHANGELOG to master

on:
  push:
    branches: [stable]
    paths:
      - 'CHANGELOG.md'

jobs:
  merge-changelog:
    runs-on: ubuntu-latest
    permissions:
      contents: write
      pull-requests: write

    steps:
      - name: Setup Repository
        uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
        with:
          repository: ${{ github.repository }}
          ref: master

      - name: Configure git
        run: |
          git config user.name "[bot] Merge Changelog"
          git config user.email "<>"

      - name: Read CHANGELOG.md from the stable branch
        id: read_stable_changelog
        run: |
          CHANGELOG_CONTENT=$(git show origin/stable:CHANGELOG.md)
          echo "CHANGELOG_CONTENT<<EOF" >> $GITHUB_ENV
          echo "$CHANGELOG_CONTENT" >> $GITHUB_ENV
          echo "EOF" >> $GITHUB_ENV

      - name: Prepare PR branch and commit changes
        id: prepare_pr_branch
        run: |
          PR_BRANCH="sync-changelog-stable-to-master-$(date +%s)"
          echo "pr_branch_name=$PR_BRANCH" >> "$GITHUB_OUTPUT"
          git checkout -b "$PR_BRANCH" master
          echo "${{ env.CHANGELOG_CONTENT }}" > CHANGELOG.md
          git add CHANGELOG.md
          git commit -m "Sync CHANGELOG.md from stable"
          git push origin "$PR_BRANCH"

      - name: Create Pull Request
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          PR_HEAD_BRANCH=${{ steps.prepare_pr_branch.outputs.pr_branch_name }}

          gh pr create \
            --base master \
            --head "$PR_HEAD_BRANCH" \
            --title "Sync CHANGELOG.md from stable" \
            --body "This PR automates the synchronization of \`CHANGELOG.md\` from the \`stable\` branch to the \`master\` branch." \
            --label autosubmit