version-check.yml

name: Version Check

on:
  pull_request:
    branches:
      - main

jobs:
  version-check:
    runs-on: ubuntu-latest
    name: Verify VERSION is bumped

    steps:
      - name: Checkout PR branch
        uses: actions/checkout@v4

      - name: Read PR branch VERSION
        id: pr_version
        run: |
          PR_VERSION=$(cat VERSION | tr -d '[:space:]')
          echo "version=$PR_VERSION" >> "$GITHUB_OUTPUT"
          echo "PR branch VERSION: $PR_VERSION"

      - name: Fetch main branch VERSION
        id: main_version
        run: |
          git fetch origin main
          MAIN_VERSION=$(git show origin/main:VERSION | tr -d '[:space:]')
          echo "version=$MAIN_VERSION" >> "$GITHUB_OUTPUT"
          echo "Main branch VERSION: $MAIN_VERSION"

      - name: Compare versions
        run: |
          PR_VERSION="${{ steps.pr_version.outputs.version }}"
          MAIN_VERSION="${{ steps.main_version.outputs.version }}"

          echo "Main VERSION: $MAIN_VERSION"
          echo "PR VERSION:   $PR_VERSION"

          # Split versions into major.minor.patch
          IFS='.' read -r PR_MAJOR PR_MINOR PR_PATCH <<< "$PR_VERSION"
          IFS='.' read -r MAIN_MAJOR MAIN_MINOR MAIN_PATCH <<< "$MAIN_VERSION"

          # Default patch to 0 if missing
          PR_PATCH=${PR_PATCH:-0}
          MAIN_PATCH=${MAIN_PATCH:-0}

          # Compare: PR version must be strictly greater than main version
          if [ "$PR_MAJOR" -gt "$MAIN_MAJOR" ]; then
            echo "Version bump valid (major): $MAIN_VERSION -> $PR_VERSION"
            exit 0
          elif [ "$PR_MAJOR" -eq "$MAIN_MAJOR" ] && [ "$PR_MINOR" -gt "$MAIN_MINOR" ]; then
            echo "Version bump valid (minor): $MAIN_VERSION -> $PR_VERSION"
            exit 0
          elif [ "$PR_MAJOR" -eq "$MAIN_MAJOR" ] && [ "$PR_MINOR" -eq "$MAIN_MINOR" ] && [ "$PR_PATCH" -gt "$MAIN_PATCH" ]; then
            echo "Version bump valid (patch): $MAIN_VERSION -> $PR_VERSION"
            exit 0
          else
            echo "::error::VERSION must be bumped. PR version ($PR_VERSION) is not higher than main version ($MAIN_VERSION). Please update the VERSION file."
            exit 1
          fi