name: Check Package Version

on:
  workflow_call:
    inputs:
      workspacePath:
        description: 'Path relative to repo root where package.json is located'
        required: false
        type: string
        default: '.'
    outputs:
      version_changed:
        description: 'Whether the version changed from the previous commit'
        value: ${{ jobs.check_version.outputs.version_changed }}
      version:
        description: 'Current version from package.json'
        value: ${{ jobs.check_version.outputs.version }}

jobs:
  check_version:
    runs-on: ubuntu-latest
    outputs:
      version_changed: ${{ steps.version-check.outputs.version_changed }}
      version: ${{ steps.version-check.outputs.version }}

    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Check if version changed
        id: version-check
        run: |
          WORKSPACE_PATH="${{ inputs.workspacePath }}"
          # Clean up path - remove trailing slash if present
          WORKSPACE_PATH="${WORKSPACE_PATH%/}"
          # Handle root directory case
          if [ "$WORKSPACE_PATH" = "." ]; then
            PACKAGE_JSON_PATH="package.json"
          else
            PACKAGE_JSON_PATH="${WORKSPACE_PATH}/package.json"
          fi

          # Get current version
          CURRENT_VERSION=$(node -p "require('./${PACKAGE_JSON_PATH}').version")
          echo "Current version: $CURRENT_VERSION"
          echo "version=$CURRENT_VERSION" >> $GITHUB_OUTPUT

          # Check if HEAD~1 exists (handle first commit)
          if ! git rev-parse HEAD~1 &>/dev/null; then
            echo "First commit detected, running workflow"
            echo "version_changed=true" >> $GITHUB_OUTPUT
            exit 0
          fi

          # Check if package.json exists in previous commit
          if ! git show HEAD~1:${PACKAGE_JSON_PATH} &>/dev/null; then
            echo "package.json doesn't exist in previous commit"
            echo "version_changed=true" >> $GITHUB_OUTPUT
            exit 0
          fi

          # Extract previous version using grep/sed (safer than node for old file)
          PREVIOUS_VERSION=$(git show HEAD~1:${PACKAGE_JSON_PATH} | grep '"version"' | head -1 | sed -E 's/.*"version"\s*:\s*"([^"]+)".*/\1/')
          echo "Previous version: $PREVIOUS_VERSION"

          # Validate extraction
          if [ -z "$PREVIOUS_VERSION" ]; then
            echo "Warning: Could not extract previous version, assuming changed"
            echo "version_changed=true" >> $GITHUB_OUTPUT
            exit 0
          fi

          # Compare versions
          if [ "$CURRENT_VERSION" != "$PREVIOUS_VERSION" ]; then
            echo "Version changed: $PREVIOUS_VERSION -> $CURRENT_VERSION"
            echo "version_changed=true" >> $GITHUB_OUTPUT
          else
            echo "Version unchanged: $CURRENT_VERSION"
            echo "version_changed=false" >> $GITHUB_OUTPUT
          fi