name: Check Image Version

on:
  workflow_call:
    inputs:
      workspacePath:
        description: 'Path relative to repo root where package.json is located'
        required: false
        type: string
        default: '.'
      imageName:
        description: 'Docker image name without registry FQDN or username'
        required: true
        type: string
      registryUrl:
        description: 'Docker registry URL (e.g., registry.budakova.org)'
        required: false
        type: string
        default: 'registry.budakova.org'
      registryUsername:
        description: 'Docker registry username'
        required: true
        type: string
      registryNamespace:
        description: 'Docker registry namespace/organization (e.g., knee-cola)'
        required: true
        type: string
    secrets:
      registryToken:
        description: 'Registry access token'
        required: true
    outputs:
      image_exists:
        description: 'Whether the image exists in the registry'
        value: ${{ jobs.check_image.outputs.image_exists }}
      version:
        description: 'Current version from package.json'
        value: ${{ jobs.check_image.outputs.version }}

jobs:
  check_image:
    runs-on: ubuntu-latest
    outputs:
      image_exists: ${{ steps.manifest-check.outputs.image_exists }}
      version: ${{ steps.version-read.outputs.version }}

    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Read version from package.json
        id: version-read
        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

          VERSION=$(node -p "try { require('./${PACKAGE_JSON_PATH}').version } catch(e) { console.error('Error reading version:', e.message); process.exit(1) }") || {
            echo "Error: Failed to read version from ${PACKAGE_JSON_PATH}"
            exit 1
          }
          echo "version=$VERSION" >> $GITHUB_OUTPUT
          echo "Checking for image version: $VERSION"

      - name: Login to Registry
        run: |
          echo "${{ secrets.registryToken }}" | docker login ${{ inputs.registryUrl }} -u "${{ inputs.registryUsername }}" --password-stdin

      - name: Check if image exists in registry
        id: manifest-check
        run: |
          VERSION=${{ steps.version-read.outputs.version }}
          IMAGE="${{ inputs.registryUrl }}/${{ inputs.registryNamespace }}/${{ inputs.imageName }}:${VERSION}"

          echo "Checking manifest for image: $IMAGE"

          if docker manifest inspect "$IMAGE" &>/dev/null; then
            echo "Image exists in registry"
            echo "image_exists=true" >> $GITHUB_OUTPUT
          else
            echo "Image does not exist in registry"
            echo "image_exists=false" >> $GITHUB_OUTPUT
          fi

      - name: Summary
        run: |
          echo "Version: ${{ steps.version-read.outputs.version }}"
          echo "Image exists: ${{ steps.manifest-check.outputs.image_exists }}"