# TODO.md - Monolog GDPR Filter

This file tracks remaining issues, improvements, and feature requests for the monolog-gdpr-filter library.

## Current Status - PRODUCTION READY

**Project Statistics (verified 2025-12-01):**

- **141 PHP files** (60 source files, 81 test files)
- **1,346 tests** with **100% success rate** (3,386 assertions)
- **85.07% line coverage**, **88.31% method coverage**
- **PHP 8.2+** with modern language features and strict type safety
- **Zero Critical Issues**: All functionality-blocking bugs resolved
- **Static Analysis**: All tools pass cleanly (Psalm, PHPStan, Rector, PHPCS)

## Static Analysis Status

All static analysis tools now pass:

- **Psalm Level 5**: 0 errors
- **PHPStan Level 6**: 0 errors
- **Rector**: No changes needed
- **PHPCS**: 0 errors, 0 warnings

## Completed Items (2025-12-01)

### Developer Experience

- [x] **Added recovery mechanism** for failed masking operations
  - `src/Recovery/FailureMode.php` - Enum for failure modes (FAIL_OPEN, FAIL_CLOSED, FAIL_SAFE)
  - `src/Recovery/RecoveryStrategy.php` - Interface for recovery strategies
  - `src/Recovery/RecoveryResult.php` - Value object for recovery outcomes
  - `src/Recovery/RetryStrategy.php` - Retry with exponential backoff
  - `src/Recovery/FallbackMaskStrategy.php` - Type-aware fallback values
- [x] **Improved error context** in audit logging with detailed context
  - `src/Audit/ErrorContext.php` - Standardized error information with sensitive data sanitization
  - `src/Audit/AuditContext.php` - Structured context for audit entries with operation types
  - `src/Audit/StructuredAuditLogger.php` - Enhanced audit logger wrapper
- [x] **Created interactive demo/playground** for pattern testing
  - `demo/PatternTester.php` - Pattern testing utility
  - `demo/index.php` - Web API endpoint
  - `demo/templates/playground.html` - Interactive web interface

### Code Quality

- [x] **Fixed all PHPCS Warnings** (81 warnings → 0):
  - Added missing PHPDoc documentation blocks
  - Fixed line length and spacing formatting issues
  - Full PSR-12 compliance achieved

### Framework Integration

- [x] **Created Symfony integration guide** - `docs/symfony-integration.md`
- [x] **Added PSR-3 logger decorator pattern example** - `docs/psr3-decorator.md`
- [x] **Created Docker development environment** - `docker/Dockerfile`, `docker/docker-compose.yml`
- [x] **Added examples for other popular frameworks** - `docs/framework-examples.md`
  - CakePHP, CodeIgniter 4, Laminas, Yii2, PSR-15 middleware

### Architecture

- [x] **Extended Strategy Pattern support**:
  - `src/Strategies/CallbackMaskingStrategy.php` - Wraps custom callbacks as strategies
  - Factory methods: `constant()`, `hash()`, `partial()` for common use cases

### Advanced Features (Completed 2025-12-01)

- [x] **Support masking arrays/objects in message strings**
  - `src/SerializedDataProcessor.php` - Handles print_r, var_export, serialize output formats
- [x] **Add data anonymization with k-anonymity**
  - `src/Anonymization/KAnonymizer.php` - K-anonymity implementation for GDPR compliance
  - `src/Anonymization/GeneralizationStrategy.php` - Age, date, location, numeric range strategies
- [x] **Add retention policy support**
  - `src/Retention/RetentionPolicy.php` - Configurable retention periods with actions (delete, anonymize, archive)
- [x] **Add data portability features (export masked logs)**
  - `src/Streaming/StreamingProcessor.php::processToFile()` - Export processed logs to files
- [x] **Implement streaming processing for very large logs**
  - `src/Streaming/StreamingProcessor.php` - Memory-efficient chunked processing with generators

### Architecture Improvements (Completed 2025-12-01)

- [x] **Refactor to follow Single Responsibility Principle more strictly**
  - `src/MaskingOrchestrator.php` - Extracted masking coordination from GdprProcessor
- [x] **Reduce coupling with `Adbar\Dot` library (create abstraction)**
  - `src/Contracts/ArrayAccessorInterface.php` - Abstraction interface
  - `src/ArrayAccessor/DotArrayAccessor.php` - Implementation using adbario/php-dot-notation
  - `src/ArrayAccessor/ArrayAccessorFactory.php` - Factory for creating accessors
- [x] **Add dependency injection container support**
  - `src/Builder/GdprProcessorBuilder.php` - Fluent builder for configuration
- [x] **Replace remaining static methods for better testability**
  - `src/Factory/AuditLoggerFactory.php` - Instance-based factory for audit loggers
  - `src/PatternValidator.php` - Instance methods added (static methods deprecated)
- [x] **Implement plugin architecture for custom processors**
  - `src/Contracts/MaskingPluginInterface.php` - Contract for masking plugins
  - `src/Plugins/AbstractMaskingPlugin.php` - Base class with no-op defaults
  - `src/Builder/PluginAwareProcessor.php` - Wrapper with pre/post processing hooks

### Documentation (Completed 2025-12-01)

- [x] **Create performance tuning guide**
  - `docs/performance-tuning.md` - Benchmarking, pattern optimization, memory management, caching, streaming
- [x] **Add troubleshooting guide with common issues**
  - `docs/troubleshooting.md` - Installation, pattern matching, performance, memory, integration issues
- [x] **Add integration examples with popular logging solutions**
  - `docs/logging-integrations.md` - ELK, Graylog, Datadog, New Relic, Sentry, Papertrail, Loggly, AWS CloudWatch, Google Cloud, Fluentd
- [x] **Create plugin development guide**
  - `docs/plugin-development.md` - Comprehensive guide for creating custom masking plugins (interface, hooks, priority, use cases)

## Development Notes

- **All critical, high, medium, and low priority functionality is complete**
- **Project is production-ready** with comprehensive test coverage (85.07% line coverage)
- **Static analysis tools all pass** - maintain this standard
- **Use `composer lint:fix` for automated code quality improvements**
- **Follow linting policy: fix issues, don't suppress unless absolutely necessary**
- **Run demo**: `php -S localhost:8080 demo/index.php`

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**Last Updated**: 2025-12-01
**Production Status**: Ready
**All Items**: Complete