name: Release

on:
  push:
    branches:
      - main
    paths-ignore:
      - '.github/workflows/**'

permissions:
  contents: write

concurrency:
  group: release
  cancel-in-progress: false

jobs:
  release:
    runs-on: ubuntu-latest
    timeout-minutes: 5
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Bump version and push tag
        id: bump
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          set -euo pipefail
          git fetch --tags --force

          if git describe --tags --exact-match HEAD >/dev/null 2>&1; then
            echo "HEAD is already tagged, skipping bump"
            exit 0
          fi

          latest=$(git tag --sort=-v:refname --list 'v*.*.*-alpha' | head -n 1)
          if [ -z "$latest" ]; then
            echo "::error::No tag matching vX.Y.Z-alpha pattern found"
            exit 1
          fi
          echo "Latest tag: $latest"

          version="${latest#v}"
          version="${version%-alpha}"
          IFS='.' read -r major minor patch <<< "$version"
          new_version="${major}.${minor}.$((patch + 1))-alpha"
          new_tag="v${new_version}"

          if git rev-parse "$new_tag" >/dev/null 2>&1; then
            echo "::error::Tag $new_tag already exists"
            exit 1
          fi

          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git tag -a "$new_tag" -m "Release $new_tag"
          git push origin "$new_tag"

          echo "tag=$new_tag" >> "$GITHUB_OUTPUT"

      - name: Create GitHub release
        if: steps.bump.outputs.tag
        uses: softprops/action-gh-release@v2
        with:
          tag_name: ${{ steps.bump.outputs.tag }}
          name: ${{ steps.bump.outputs.tag }}
          prerelease: true
          generate_release_notes: true