# Cuts a release: moves CHANGELOG.md's [Unreleased] section under a new
# version heading, commits it to main, then creates and pushes the version tag.
# Trigger manually via workflow_dispatch, entering the semver to release.
# The pushed tag can then be built with docker-publish.yml.

name: Create Release Tag

on:
  workflow_dispatch:
    inputs:
      version:
        description: "Version to release (semver, e.g. 1.2.3)"
        required: true
        type: string

jobs:
  tag:
    runs-on: ubuntu-latest
    permissions:
      contents: write

    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Validate version and Unreleased section
        run: |
          if ! [[ "${{ inputs.version }}" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
            echo "Error: '${{ inputs.version }}' is not a valid semver (e.g. 1.2.3)."
            exit 1
          fi
          if git rev-parse "refs/tags/${{ inputs.version }}" >/dev/null 2>&1; then
            echo "Error: tag '${{ inputs.version }}' already exists."
            exit 1
          fi
          awk '/^## \[Unreleased\]/{f=1;next}/^## \[/{f=0}f' CHANGELOG.md > /tmp/unreleased.md
          if ! grep -q '[^[:space:]]' /tmp/unreleased.md; then
            echo "Error: CHANGELOG.md's [Unreleased] section is empty — nothing to release."
            exit 1
          fi

      - name: Move Unreleased entries under the new version heading
        run: |
          today=$(date +%Y-%m-%d)
          awk -v ver="${{ inputs.version }}" -v date="$today" '
            /^## \[Unreleased\]/ { print; print ""; print "## [" ver "] - " date; next }
            { print }
          ' CHANGELOG.md > /tmp/CHANGELOG.md
          mv /tmp/CHANGELOG.md CHANGELOG.md

      - name: Commit and tag
        run: |
          git config user.name "gitea-actions"
          git config user.email "actions@noreply.git.arthurerlich.de"
          git add CHANGELOG.md
          git commit -m "chore(release): ${{ inputs.version }}"
          git tag "${{ inputs.version }}"
          git push origin HEAD:main
          git push origin "${{ inputs.version }}"