name: Create Release

on:
  push:
    branches: [main]
    paths: [CHANGELOG.md]
  workflow_dispatch:

jobs:
  release:
    runs-on: ubuntu-latest
    permissions:
      contents: write
    steps:
      - name: Checkout
        uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - name: Determine version
        id: version
        run: |
          # Extract latest version from CHANGELOG.md
          VERSION=$(grep -m1 '^## \[' CHANGELOG.md | sed 's/^## \[\(.*\)\].*/\1/')
          if [ -z "$VERSION" ]; then
            echo "No version found in CHANGELOG.md"
            exit 0
          fi
          # Check if tag already exists
          if git rev-parse "v${VERSION}" >/dev/null 2>&1; then
            echo "Tag v${VERSION} already exists, skipping"
            echo "skip=true" >> "$GITHUB_OUTPUT"
            exit 0
          fi
          echo "tag=v${VERSION}" >> "$GITHUB_OUTPUT"
          echo "version=${VERSION}" >> "$GITHUB_OUTPUT"

      - name: Create tag if needed
        if: steps.version.outputs.skip != 'true' && steps.version.outputs.tag != ''
        run: |
          TAG="${{ steps.version.outputs.tag }}"
          if ! git rev-parse "$TAG" >/dev/null 2>&1; then
            git tag "$TAG"
            git push origin "$TAG"
          fi

      - name: Extract changelog
        if: steps.version.outputs.skip != 'true' && steps.version.outputs.version != ''
        run: |
          VERSION="${{ steps.version.outputs.version }}"
          NOTES=$(sed -n "/^## \[${VERSION}\]/,/^## \[/p" CHANGELOG.md | head -n -1)
          if [ -z "$NOTES" ]; then
            NOTES="Release v${VERSION}"
          fi
          echo "$NOTES" > /tmp/release-notes.md

      - name: Create GitHub release
        if: steps.version.outputs.skip != 'true' && steps.version.outputs.version != ''
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          TAG="${{ steps.version.outputs.tag }}"
          gh release create "$TAG" \
            --title "$TAG" \
            --notes-file /tmp/release-notes.md