name: version-bump

on:
  pull_request:
    types: [closed]
    branches: [main]

permissions:
  contents: write

jobs:
  bump:
    if: github.event.pull_request.merged == true
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5  # v4
        with:
          fetch-depth: 0
          persist-credentials: false

      - name: Determine version bump type
        id: bump-type
        env:
          BRANCH: ${{ github.head_ref }}
          TITLE: ${{ github.event.pull_request.title }}
        run: |
          # Feature branches (feat/) bump minor, everything else bumps patch
          if echo "$BRANCH" | grep -qiE '^feat/'; then
            echo "type=minor" >> "$GITHUB_OUTPUT"
          elif echo "$TITLE" | grep -qiE '^feat'; then
            echo "type=minor" >> "$GITHUB_OUTPUT"
          else
            echo "type=patch" >> "$GITHUB_OUTPUT"
          fi
          echo "Bump type: $(grep type "$GITHUB_OUTPUT" | cut -d= -f2) (branch: $BRANCH)"

      - name: Bump version
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"

          BUMP_TYPE="${{ steps.bump-type.outputs.type }}"
          latest=$(git tag --sort=-v:refname | grep -E '^v[0-9]+\.[0-9]+' | head -1)
          if [ -z "$latest" ]; then
            echo "No version tag found, starting at v0.0.1"
            next="v0.0.1"
          else
            version="${latest#v}"
            major=$(echo "$version" | cut -d. -f1)
            minor=$(echo "$version" | cut -d. -f2)
            patch=$(echo "$version" | cut -d. -f3)
            patch=${patch:-0}

            if [ "$BUMP_TYPE" = "minor" ]; then
              next="v${major}.$((minor + 1)).0"
            else
              next="v${major}.${minor}.$((patch + 1))"
            fi
          fi

          echo "Tagging $next (previous: ${latest:-none}, bump: $BUMP_TYPE)"
          git tag -a "$next" -m "Release $next"
          git push origin "$next"

      - name: Create GitHub Release
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          latest=$(git tag --sort=-v:refname | grep -E '^v[0-9]+\.[0-9]+' | head -1)
          gh release create "$latest" --title "$latest" --notes "Release $latest" --latest