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@v4
        with:
          fetch-depth: 0

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

          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
            # Strip leading v
            version="${latest#v}"
            major=$(echo "$version" | cut -d. -f1)
            minor=$(echo "$version" | cut -d. -f2)
            patch=$(echo "$version" | cut -d. -f3)
            patch=${patch:-0}
            next="v${major}.${minor}.$((patch + 1))"
          fi

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