on:
  pull_request:
    branches:
      - master

jobs:
  check-pr-version:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout PR branch
        uses: actions/checkout@v3

      - name: Get version from PR branch
        id: pr_version
        run: |
          PR_VERSION=$(find . -name '*.csproj' -exec grep '<Version>' {} \; | sed -E 's/.*<Version>(.*)<\/Version>.*/\1/')
          echo "PR_VERSION=$PR_VERSION" >> $GITHUB_ENV

      - name: Checkout master branch to separate directory
        uses: actions/checkout@v3
        with:
          ref: master
          path: master_branch

      - name: Get version from master branch
        id: master_version
        run: |
          MASTER_VERSION=$(find master_branch -name '*.csproj' -exec grep '<Version>' {} \; | sed -E 's/.*<Version>(.*)<\/Version>.*/\1/')
          echo "MASTER_VERSION=$MASTER_VERSION" >> $GITHUB_ENV

      - name: Debug $GITHUB_ENV
        run: |
          echo "PR_VERSION: $PR_VERSION"
          echo "MASTER_VERSION: $MASTER_VERSION"

      - name: Compare versions
        run: |
          if [ -z "$PR_VERSION" ] || [ -z "$MASTER_VERSION" ]; then
            echo "One of the version variables is empty."
            exit 1
          fi

          if [ "$(printf '%s\n' "$MASTER_VERSION" "$PR_VERSION" | sort -V | tail -n1)" != "$PR_VERSION" ] || [ "$PR_VERSION" = "$MASTER_VERSION" ]; then
            echo "Version in PR is not higher than master."
            exit 1
          else
            echo "Version in PR is higher than master."
          fi