name: Version Check

on:
  pull_request:
    branches:
      - main
    paths:
      - 'Cargo.toml'

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

      - name: Compare versions
        shell: bash
        run: |
          NEW_VERSION=$(grep -m 1 '^version =' Cargo.toml | cut -d '"' -f 2)
          
          git fetch origin ${{ github.base_ref }}
          OLD_VERSION=$(git show origin/${{ github.base_ref }}:Cargo.toml | grep -m 1 '^version =' | cut -d '"' -f 2)

          echo "Old version (main): $OLD_VERSION"
          echo "New version (PR): $NEW_VERSION"

          if [ "$NEW_VERSION" = "$OLD_VERSION" ]; then
            echo "Error: Cargo.toml version has not been updated in this PR!"
            exit 1
          else
            echo "Success: Version updated from $OLD_VERSION to $NEW_VERSION"
          fi