# Implementation Plan - [x] 1. Set up project structure and dependencies - Create package.json with required dependencies (@shopify/shopify-api, dotenv) - Create directory structure (src/, config/, services/, utils/) - Create .env.example file with required environment variables - _Requirements: 2.1, 2.2, 2.3, 5.1_ - [x] 2. Implement environment configuration module - Create config/environment.js to load and validate .env variables - Implement validation for required Shopify credentials and configuration - Add error handling for missing or invalid environment variables - _Requirements: 2.1, 2.2, 2.3, 2.4_ - [x] 3. Create Shopify API service - Implement services/shopify.js with GraphQL client initialization - Add authentication using Shopify access token - Implement retry logic for rate limiting and network errors - _Requirements: 1.1, 1.2, 4.1, 4.3, 5.1, 5.5_ - [x] 4. Implement price calculation utilities - Create utils/price.js with percentage-based price calculation functions - Add validation for price ranges and edge cases - Implement proper rounding for currency values - Add function to prepare price update objects with Compare At price values - _Requirements: 1.5, 2.5, 2.6, 6.1, 6.2_ - [x] 5. Create progress logging service - Implement services/progress.js for Progress.md file management - Add functions to log operation start, product updates, and completion summary - Implement timestamp formatting and markdown structure - _Requirements: 6.1, 6.2, 6.3, 6.4, 6.5_ - [x] 6. Implement console logging utilities - Create utils/logger.js for consistent console and progress file logging - Add different log levels (info, warning, error) with appropriate formatting - Integrate with progress service for dual logging - _Requirements: 3.1, 3.2, 3.3, 3.4, 3.5_ - [x] 7. Create product querying functionality - Implement GraphQL query in services/product.js to fetch products by tag - Add cursor-based pagination handling for large product sets - Include product variants in query response - _Requirements: 1.3, 5.2, 5.4_ - [x] 8. Implement product price update functionality - Add GraphQL mutation for updating product variant prices and Compare At prices - Implement batch processing of product variants with Compare At price setting - Add logic to capture original price before adjustment and set as Compare At price - Add error handling for individual product update failures - _Requirements: 1.4, 1.5, 1.6, 1.7, 4.2, 4.4, 5.3, 5.4, 6.1, 6.2, 6.3_ - [x] 9. Create main application entry point - Implement src/index.js with complete workflow orchestration - Add configuration loading, product fetching, and price updating sequence - Implement error handling and graceful exit with appropriate status codes - _Requirements: 3.1, 3.4, 4.5_ - [x] 10. Add comprehensive error handling and logging - Integrate all error handling scenarios across modules - Ensure progress logging continues even when individual operations fail - Add final summary reporting with success/failure counts - Update logging to include Compare At price information in progress tracking - _Requirements: 3.3, 3.4, 3.5, 4.1, 4.2, 4.3, 4.4, 6.5, 7.4_ - [x] 11. Create unit tests for core utilities - Write tests for price calculation functions with various scenarios - Test environment configuration loading and validation - Test progress logging functionality - _Requirements: 1.5, 2.4, 2.5, 2.6, 6.1, 6.2, 6.3_ - [x] 12. Update existing implementation to support Compare At price functionality - Modify price calculation utilities to handle Compare At price preparation - Update GraphQL mutation to include compareAtPrice field in product variant updates - Modify product update logic to capture original price and set as Compare At price - Update progress logging to include Compare At price information - _Requirements: 1.6, 1.7, 6.1, 6.2, 6.3, 6.4, 6.5_ - [x] 13. Write integration tests for Shopify API interactions - Test GraphQL query execution with mock responses - Test product update mutations with error scenarios - Test rate limiting and retry logic - Add tests for Compare At price functionality - _Requirements: 1.1, 1.2, 1.3, 1.4, 4.1, 4.3, 5.2, 5.3, 6.3_ ## Implementation Status ✅ **All tasks completed successfully!** The Shopify Price Updater implementation is fully complete with: - **Core Functionality**: Complete price update workflow with Compare At price support - **Error Handling**: Comprehensive retry logic, rate limiting, and graceful error recovery - **Progress Tracking**: Detailed logging to Progress.md with timestamps and summaries - **Testing**: Full test coverage including unit tests, integration tests, and edge cases - **Configuration**: Robust environment variable validation and configuration management - **Production Ready**: Proper exit codes, signal handling, and production-grade error handling The application is ready for production use and meets all requirements specified in the design document.