name: Draft GitHub Release

on:
  push:
    tags:
      - 'v*.*.*'
  workflow_dispatch:
    inputs:
      tag:
        description: 'Tag to release, for example v0.1.1'
        required: true
        type: string

permissions:
  contents: write

env:
  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true

jobs:
  release:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
      - name: Resolve tag
        id: vars
        run: |
          if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
            echo "tag=${{ inputs.tag }}" >> "$GITHUB_OUTPUT"
          else
            echo "tag=${GITHUB_REF_NAME}" >> "$GITHUB_OUTPUT"
          fi
      - name: Build release notes from CHANGELOG
        shell: bash
        run: |
          tag="${{ steps.vars.outputs.tag }}"
          version="${tag#v}"
          awk -v version="$version" '
            index($0, "## [" version "]") == 1 { capture=1; next }
            capture && index($0, "## [") == 1 { exit }
            capture { print }
          ' CHANGELOG.md > /tmp/release-notes.md
          if [ ! -s /tmp/release-notes.md ]; then
            printf 'Release %s\n' "$tag" > /tmp/release-notes.md
          fi
      - name: Create or update release
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          tag="${{ steps.vars.outputs.tag }}"
          assets=(docker-compose.example.yml .env.example)
          existing=()
          for asset in "${assets[@]}"; do
            [ -f "$asset" ] && existing+=("$asset")
          done
          if gh release view "$tag" >/dev/null 2>&1; then
            gh release edit "$tag" --title "$tag" --notes-file /tmp/release-notes.md
            if [ ${#existing[@]} -gt 0 ]; then
              gh release upload "$tag" "${existing[@]}" --clobber
            fi
          else
            gh release create "$tag" "${existing[@]}" --title "$tag" --notes-file /tmp/release-notes.md
          fi