name: Changelog

on:
  release:
    types: [released]

permissions:
  contents: write

jobs:
  update:
    runs-on: ubuntu-latest

    steps:
      - name: Determine target branch
        id: branch
        run: |
          TAG="${{ github.event.release.tag_name }}"
          MAJOR=$(echo "$TAG" | sed -E 's/^v?([0-9]+)\..*/\1/')
          BRANCH="${MAJOR}.x"
          if ! git ls-remote --exit-code --heads "https://github.com/${{ github.repository }}" "$BRANCH" > /dev/null 2>&1; then
            BRANCH="${{ github.event.repository.default_branch }}"
          fi
          echo "name=${BRANCH}" >> $GITHUB_OUTPUT

      - name: Checkout code
        uses: actions/checkout@v6
        with:
          ref: ${{ steps.branch.outputs.name }}

      - name: Update Changelog
        uses: stefanzweifel/changelog-updater-action@v1
        with:
          latest-version: ${{ github.event.release.name }}
          release-notes: ${{ github.event.release.body }}

      - name: Commit updated CHANGELOG
        uses: stefanzweifel/git-auto-commit-action@v7
        with:
          branch: ${{ steps.branch.outputs.name }}
          commit_message: Update CHANGELOG
          file_pattern: CHANGELOG.md