KaraokeMerge/PRD.md

Karaoke Song Library Cleanup Tool — PRD (v1 CLI)

1. Project Summary

• Goal: Analyze, deduplicate, and suggest cleanup of a large karaoke song collection, outputting a JSON “skip list” (for future imports) and supporting flexible reporting and manual review.
• Primary User: Admin (self, collection owner)
• Initial Interface: Command Line (CLI) with print/logging and JSON output
• Future Expansion: Optional web UI for filtering, review, and playback

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2. Architectural Priorities

2.1 Code Organization Principles

TOP PRIORITY: The codebase must be built with the following architectural principles from the beginning:

• True Separation of Concerns:

  • Many small files with focused responsibilities
  • Each module/class should have a single, well-defined purpose
  • Avoid monolithic files with mixed responsibilities

• Constants and Enums:

  • Create constants, enums, and configuration objects to avoid duplicate code or values
  • Centralize magic numbers, strings, and configuration values
  • Use enums for type safety and clarity

• Readability and Maintainability:

  • Code should be self-documenting with clear naming conventions
  • Easy to understand, extend, and refactor
  • Consistent patterns throughout the codebase

• Extensibility:

  • Design for future growth and feature additions
  • Modular architecture that allows easy integration of new components
  • Clear interfaces between modules

• Refactorability:

  • Code structure should make future refactoring straightforward
  • Minimize coupling between components
  • Use dependency injection and abstraction where appropriate

These principles are fundamental to the project's long-term success and must be applied consistently throughout development.

2.2 Documentation Requirements

CRITICAL REQUIREMENT: All code changes, feature additions, or modifications MUST be accompanied by corresponding updates to the project documentation:

• PRD.md Updates: Any changes to project requirements, architecture, or functionality must be reflected in this document
• README.md Updates: User-facing features, installation instructions, or usage changes must be documented
• Code Comments: Significant logic changes should include inline documentation
• API Documentation: New endpoints, functions, or interfaces must be documented

Documentation Update Checklist:

• Update PRD.md with any architectural or requirement changes
• Update README.md with new features, installation steps, or usage instructions
• Add inline comments for complex logic or business rules
• Update any configuration examples or file structure documentation
• Review and update implementation status sections

This documentation requirement is mandatory and ensures the project remains maintainable and accessible to future developers and users.

2.3 Code Quality & Development Standards

MANDATORY STANDARDS: The following standards must be followed to ensure code quality, maintainability, and AI-friendly development:

Naming Conventions

• Files: Use descriptive, lowercase names with underscores (song_matcher.py, priority_manager.py)
• Classes: PascalCase (SongMatcher, PreferencesManager)
• Functions/Methods: snake_case (process_songs, get_priority_order)
• Constants: UPPER_SNAKE_CASE (MAX_FILE_SIZE, DEFAULT_CHANNEL_PRIORITY)
• Variables: snake_case with descriptive names (song_collection, duplicate_count)

Code Structure Standards

• Function Length: Maximum 50 lines per function (aim for 20-30 lines)
• Class Length: Maximum 300 lines per class (aim for 100-200 lines)
• File Length: Maximum 500 lines per file (aim for 200-400 lines)
• Indentation: 4 spaces (no tabs)
• Line Length: Maximum 120 characters
• Import Organization: Group imports: standard library, third-party, local (alphabetical within groups)

Error Handling & Logging

• Exception Handling: Always use specific exception types, never bare except:
• Logging: Use Python's logging module with appropriate levels (DEBUG, INFO, WARNING, ERROR)
• User Feedback: Provide clear, actionable error messages
• Graceful Degradation: Handle missing files/configs gracefully with sensible defaults

Type Hints & Documentation

• Type Hints: Use Python type hints for all function parameters and return values
• Docstrings: Include docstrings for all public functions, classes, and modules
• Docstring Format: Use Google-style docstrings with parameter descriptions
• Complex Logic: Add inline comments explaining business logic and algorithms

Testing Standards

• Unit Tests: Write unit tests for all business logic functions
• Test Coverage: Aim for 80%+ code coverage
• Test Organization: Mirror the source code structure in test files
• Test Data: Use fixtures and factories for test data, never hardcode test values
• Integration Tests: Test complete workflows and API endpoints

Configuration Management

• Environment Variables: Use environment variables for sensitive data (API keys, paths)
• Config Validation: Validate configuration on startup with clear error messages
• Default Values: Provide sensible defaults for all configuration options
• Config Documentation: Document all configuration options with examples

Performance & Scalability

• Memory Efficiency: Process large datasets in chunks, avoid loading everything into memory
• Progress Indicators: Show progress for long-running operations
• Caching: Implement appropriate caching for expensive operations
• Async Operations: Use async/await for I/O operations where beneficial

Security Best Practices

• Input Validation: Validate and sanitize all user inputs
• File Operations: Use pathlib for safe file path handling
• JSON Safety: Use json.loads() with proper error handling
• No Hardcoded Secrets: Never commit API keys, passwords, or sensitive data

Version Control Standards

• Commit Messages: Use conventional commit format (feat:, fix:, docs:, refactor:)
• Branch Naming: Use descriptive branch names (feature/priority-management, fix/duplicate-detection)
• Pull Requests: Require code review for all changes
• Git Hooks: Use pre-commit hooks for linting and formatting

Dependency Management

• Requirements: Keep requirements.txt updated with exact versions
• Virtual Environments: Always use virtual environments for development
• Dependency Updates: Regularly update dependencies and test compatibility
• Minimal Dependencies: Only include necessary dependencies, avoid bloat

Code Review Checklist

• Code follows naming conventions
• Functions are appropriately sized and focused
• Error handling is comprehensive
• Type hints and docstrings are present
• Tests are included for new functionality
• Configuration is properly validated
• No hardcoded values or secrets
• Performance considerations addressed
• Documentation is updated

These standards ensure the codebase remains clean, maintainable, and accessible to both human developers and AI assistants.

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3. Data Handling & Matching Logic

3.1 Input

• Reads from /data/allSongs.json
• Each song includes at least:
  • artist, title, path, (plus id3 tag info, channel for MP4s)

3.2 Song Matching

• Primary keys: artist + title
  • Fuzzy matching configurable (enabled/disabled with threshold)
  • Multi-artist handling: parse delimiters (commas, “feat.”, etc.)
• File type detection: Use file extension from path (.mp3, .cdg, .mp4)

3.3 Channel Priority (for MP4s)

• Configurable folder names:
  • Set in /config/config.json as an array of folder names
  • Order = priority (first = highest priority)
  • Tool searches for these folder names within the song's path property
  • Songs without matching folder names are marked for manual review
• File type priority: MP4 > CDG/MP3 pairs > standalone MP3 > standalone CDG
• CDG/MP3 pairing: CDG and MP3 files with the same base filename are treated as a single karaoke song unit

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4. Output & Reporting

4.1 Skip List

• Format: JSON (/data/skipSongs.json)
  • List of file paths to skip in future imports
  • Optionally: “reason” field (e.g., {"path": "...", "reason": "duplicate"})

4.2 CLI Reporting

• Summary: Total songs, duplicates found, types breakdown, etc.
• Verbose per-song output: Only for matches/duplicates (not every song)
• Verbosity configurable: (via CLI flag or config)

4.3 Manual Review (Web UI)

• Interactive Web Interface: Table/grid view for ambiguous/complex cases
• Media Preview: Ability to preview media before making a selection
• Bulk Actions: Select multiple items for batch operations
• Real-time Filtering: Search and filter capabilities
• Responsive Design: Works on desktop and mobile devices
• Easy Startup: Simple script (start_web_ui.py) with dependency checking

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5. Features & Edge Cases

• Batch Processing:
  • E.g., "Auto-skip all but highest-priority channel for each song"
  • Manual review as CLI flag (future: always in web UI)
• Edge Cases:
  • Multiple versions (>2 formats)
  • Support for keeping multiple versions per song (configurable/manual)
• Non-destructive: Never deletes or moves files, only generates skip list and reports

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6. Tech Stack & Organization

• CLI Language: Python
• Config: JSON (channel priorities, settings)
• Current Folder Structure:

KaraokeMerge/
├── data/
│   ├── allSongs.json          # Input: Your song library data
│   ├── skipSongs.json         # Output: Generated skip list
│   └── reports/               # Detailed analysis reports
│       ├── analysis_data.json
│       ├── actionable_insights_report.txt
│       ├── channel_optimization_report.txt
│       ├── duplicate_pattern_report.txt
│       ├── enhanced_summary_report.txt
│       ├── skip_list_summary.txt
│       └── skip_songs_detailed.json
├── config/
│   └── config.json            # Configuration settings
├── cli/
│   ├── main.py                # Main CLI application
│   ├── matching.py            # Song matching logic
│   ├── report.py              # Report generation
│   └── utils.py               # Utility functions
├── web/                       # Web UI for manual review
│   ├── app.py                 # Flask web application
│   └── templates/
│       └── index.html         # Web interface template
├── start_web_ui.py            # Web UI startup script
├── test_tool.py               # Validation and testing script
├── requirements.txt           # Python dependencies
├── .gitignore                 # Git ignore rules
├── PRD.md                     # Product Requirements Document
└── README.md                  # Project documentation

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7. Web UI Implementation

7.1 Current Web UI Features

• Interactive Table View: Sortable, filterable grid of duplicate songs
• Bulk Selection: Select multiple items for batch operations
• Search & Filter: Real-time search across artists, titles, and paths
• Responsive Design: Mobile-friendly interface
• Easy Startup: Automated dependency checking and browser launch
• Video Playback: Direct MP4 video playback in modal popup for previewing karaoke videos
• Drag-and-Drop Priority Management: Interactive reordering of file priorities with persistent preferences

7.2 Web UI Architecture

• Flask Backend: Lightweight web server (web/app.py)
• HTML Template: Modern, responsive interface (web/templates/index.html)
• Startup Script: Dependency management and server startup (start_web_ui.py)

7.3 Future Web UI Enhancements

• Audio preview for MP3 files
• Real-time configuration editing
• Advanced filtering and sorting options
• Export capabilities for manual selections
• Batch video preview functionality
• Video thumbnail generation

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8. Open Questions (for future refinement)

• Fuzzy matching library/thresholds?
• Best parsing rules for multi-artist/feat. strings?
• Any alternate export formats needed?
• Temporary/partial skip support for "under review" songs?

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9. Implementation Status

✅ Completed Features

• Write initial CLI tool to parse allSongs.json, deduplicate, and output skipSongs.json
• Print CLI summary reports (with verbosity control)
• Implement config file support for channel priority
• Organize folder/file structure for easy expansion

🎯 Current Implementation

The tool has been successfully implemented with the following components:

Core Modules:

• cli/main.py - Main CLI application with argument parsing
• cli/matching.py - Song matching and deduplication logic
• cli/report.py - Report generation and output formatting
• cli/utils.py - Utility functions for file operations and data processing

Configuration:

• config/config.json - Configurable settings for channel priorities, matching rules, and output options

Features Implemented:

• Multi-format support (MP3, CDG, MP4)
• CDG/MP3 Pairing Logic: Files with same base filename treated as single karaoke song units
• Channel priority system for MP4 files (based on folder names in path)
• Fuzzy matching support with configurable threshold
• Multi-artist parsing with various delimiters
• Enhanced Analysis & Reporting: Comprehensive statistical analysis with actionable insights
• Channel priority analysis and manual review identification
• Non-destructive operation (skip lists only)
• Verbose and dry-run modes
• Detailed duplicate analysis
• Skip list generation with metadata
• Pattern Analysis: Skip list pattern analysis and channel optimization suggestions

File Type Priority System:

1. MP4 files (with channel priority sorting)
2. CDG/MP3 pairs (treated as single units)
3. Standalone MP3 files
4. Standalone CDG files

Performance Results:

• Successfully processed 37,015 songs
• Identified 12,424 duplicates (33.6% duplicate rate)
• Generated comprehensive skip list with metadata (10,998 unique files after deduplication)
• Optimized for large datasets with progress indicators
• Enhanced Analysis: Generated 7 detailed reports with actionable insights
• Bug Fix: Resolved duplicate entries in skip list (removed 1,426 duplicate entries)

📋 Next Steps Checklist

✅ Completed

• Write initial CLI tool to parse allSongs.json, deduplicate, and output skipSongs.json
• Print CLI summary reports (with verbosity control)
• Implement config file support for channel priority
• Organize folder/file structure for easy expansion
• Implement CDG/MP3 pairing logic for accurate duplicate detection
• Generate comprehensive skip list with metadata
• Optimize performance for large datasets (37,000+ songs)
• Add progress indicators and error handling
• Generate detailed analysis reports (--save-reports functionality)
• Create web UI for manual review of ambiguous cases
• Add test tool for validation and debugging
• Create startup script for web UI with dependency checking
• Add comprehensive .gitignore file
• Update documentation with required data file information
• Implement drag-and-drop priority management with persistent preferences
• Add MP4 video playback functionality in web UI modal

🎯 Next Priority Items

• Analyze MP4 files without channel priorities to suggest new folder names
• Add support for additional file formats if needed
• Implement batch processing capabilities
• Create integration scripts for karaoke software
• Add unit tests for core functionality
• Implement audio fingerprinting for better duplicate detection