name: Version Bump

# On every PR merged into main, bumps the minor version (X.Y.Z -> X.(Y+1).0)
# and pushes it as a new tag. That tag push triggers release.yml, which
# builds the installer and publishes a GitHub Release (and, in turn,
# winget.yml keeps WinGet in sync).

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

permissions:
  contents: write

concurrency:
  group: version-bump
  cancel-in-progress: false

jobs:
  bump:
    if: github.event.pull_request.merged == true
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          ref: main
          fetch-depth: 0

      - name: Compute next version
        id: version
        run: |
          latest="$(git tag -l 'v*.*.*' | sort -V | tail -n1)"
          if [ -z "$latest" ]; then
            new="v0.1.0"
          else
            ver="${latest#v}"
            major="${ver%%.*}"
            rest="${ver#*.}"
            minor="${rest%%.*}"
            new="v${major}.$((minor + 1)).0"
          fi
          echo "Latest tag: ${latest:-<none>}"
          echo "New tag: $new"
          echo "tag=$new" >> "$GITHUB_OUTPUT"

      - name: Create and push tag
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git tag "${{ steps.version.outputs.tag }}"
          git push origin "${{ steps.version.outputs.tag }}"