name: Version Check

on:
  pull_request:
    branches: [main]
    paths:
      - 'package.json'
      - 'src/**'

jobs:
  check-version:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Check version was bumped if source changed
        run: |
          BASE_SHA="${{ github.event.pull_request.base.sha }}"
          HEAD_SHA="${{ github.event.pull_request.head.sha }}"

          # Check if any src/ files changed
          SRC_CHANGED=$(git diff --name-only "$BASE_SHA" "$HEAD_SHA" -- 'src/' | wc -l)
          if [ "$SRC_CHANGED" -eq 0 ]; then
            echo "No source changes detected, skipping version check."
            exit 0
          fi

          # Compare package.json versions
          BASE_VERSION=$(git show "${BASE_SHA}:package.json" | node -p "JSON.parse(require('fs').readFileSync('/dev/stdin','utf8')).version")
          HEAD_VERSION=$(node -p "require('./package.json').version")

          if [ "$BASE_VERSION" = "$HEAD_VERSION" ]; then
            echo "::warning::Source files changed but package.json version was not bumped (${HEAD_VERSION}). Consider updating the version."
          else
            echo "Version bumped: ${BASE_VERSION} → ${HEAD_VERSION}"
          fi