name: version-changelog

on:
  pull_request:
    branches: [main]

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

      - name: Check version bump and changelog entry
        run: |
          set -e
          PR_VERSION=$(grep -m1 '"version"' composer.json | sed -E 's/.*"version"[[:space:]]*:[[:space:]]*"([^"]+)".*/\1/')
          MAIN_VERSION=$(git show origin/main:composer.json | grep -m1 '"version"' | sed -E 's/.*"version"[[:space:]]*:[[:space:]]*"([^"]+)".*/\1/')

          echo "main version: $MAIN_VERSION"
          echo "PR version:   $PR_VERSION"

          if [ "$MAIN_VERSION" = "$PR_VERSION" ]; then
            echo "::error::composer.json version ($PR_VERSION) was not bumped from main ($MAIN_VERSION)"
            exit 1
          fi

          HIGHEST=$(printf '%s\n%s\n' "$MAIN_VERSION" "$PR_VERSION" | sort -V | tail -n1)
          if [ "$HIGHEST" != "$PR_VERSION" ]; then
            echo "::error::composer.json version ($PR_VERSION) is not greater than main's ($MAIN_VERSION)"
            exit 1
          fi

          if ! grep -qF "## [$PR_VERSION]" CHANGELOG.md; then
            echo "::error::CHANGELOG.md is missing a '## [$PR_VERSION]' heading"
            exit 1
          fi

          echo "OK: version bumped to $PR_VERSION and documented in CHANGELOG.md"