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Author: NSHkr

docs/desktop/03_TDD_STRATEGY.md

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 # TDD Strategy for JsonRemedy
 
+## 📋 Implementation Status Checklist
+
+### Phase 1: Foundation & Interfaces
+- [x] **LayerBehaviour Contract** - Core interface for all layers
+  - [x] `process/1` function signature
+  - [x] Input/output type specifications
+  - [x] Error handling patterns
+  - [x] Documentation and examples
+
+### Phase 2: Layer 1 - Content Cleaning
+- [x] **Implementation Complete** (497 lines)
+  - [x] Code fence removal (`remove_code_fences/1`)
+  - [x] Comment stripping (`strip_comments/1`) 
+  - [x] Encoding normalization (`normalize_encoding/1`)
+  - [x] Error handling and validation
+- [x] **Test Coverage Complete** (329 lines)
+  - [x] Unit tests for all functions
+  - [x] Edge case handling
+  - [x] Error condition testing
+  - [x] Integration scenarios
+- [x] **Documentation Complete** (`docs/LAYER_1.md`)
+
+### Phase 3: Layer 2 - Structural Repair
+- [x] **Implementation Complete** (497 lines)
+  - [x] State machine architecture
+  - [x] Quote balancing (`balance_quotes/1`)
+  - [x] Bracket matching (`balance_brackets/1`)
+  - [x] Comprehensive error recovery
+- [x] **Test Coverage Complete** (329 lines)
+  - [x] State transition testing
+  - [x] Complex nested structure tests
+  - [x] Malformed input handling
+  - [x] Performance edge cases
+- [x] **Documentation Complete** (`LAYER_2.md`)
+
+### Phase 4: Layer 3 - Syntax Normalization  
+- [x] **Implementation Complete** (2050+ lines)
+  - [x] Character-by-character parser
+  - [x] Token-based processing
+  - [x] Syntax error correction
+  - [x] Context-aware repairs
+- [x] **Test Coverage Complete** (597 lines)
+  - [x] Parser state machine tests
+  - [x] Complex syntax scenario testing
+  - [x] Error recovery validation
+  - [x] Integration with Layer 2
+- [x] **Documentation Complete** (`LAYER_3.md`)
+
+### Phase 5: Layer 4 - Validation Layer ⏳
+- [ ] **Implementation Pending**
+  - [ ] JSON schema validation
+  - [ ] Type checking and coercion
+  - [ ] Data integrity verification
+  - [ ] Custom validation rules
+- [ ] **Test Coverage Pending**
+  - [ ] Schema validation tests
+  - [ ] Type coercion scenarios
+  - [ ] Invalid data handling
+  - [ ] Performance benchmarks
+- [ ] **Documentation Pending**
+
+### Phase 6: Layer 5 - Tolerant Parsing ⏳
+- [ ] **Implementation Pending**
+  - [ ] Flexible JSON parsing
+  - [ ] Best-effort data extraction
+  - [ ] Partial result generation
+  - [ ] Fallback mechanisms
+- [ ] **Test Coverage Pending**
+  - [ ] Tolerance scenario tests
+  - [ ] Partial parsing validation
+  - [ ] Fallback behavior testing
+  - [ ] Edge case handling
+- [ ] **Documentation Pending**
+
+### Phase 7: Integration Pipeline ⏳
+- [ ] **Core Pipeline Implementation**
+  - [ ] Layer orchestration system
+  - [ ] Data flow between layers
+  - [ ] Error propagation handling
+  - [ ] Performance optimization
+- [ ] **Pipeline Testing**
+  - [ ] End-to-end integration tests
+  - [ ] Layer interaction validation
+  - [ ] Error handling scenarios
+  - [ ] Performance benchmarking
+- [ ] **Pipeline Documentation**
+
+### Phase 8: Performance & Production Readiness ⏳
+- [ ] **Performance Framework**
+  - [ ] Comprehensive benchmarking suite
+  - [ ] Memory usage profiling
+  - [ ] Concurrency testing
+  - [ ] Scalability validation
+- [ ] **Production Features**
+  - [ ] Monitoring and metrics
+  - [ ] Configuration management
+  - [ ] Deployment documentation
+  - [ ] Production testing
+
+### Current Status Summary
+- **✅ Completed Phases:** 1-4 (Foundation through Layer 3)
+- **⏳ In Progress:** Phase 5 (Layer 4 - Validation)
+- **📊 Overall Progress:** 50% complete (4/8 phases)
+- **🧪 Test Coverage:** Comprehensive for completed layers
+- **📚 Documentation:** Complete for Layers 1-3
+
+---
+
 ## Overview
 
 This document outlines a comprehensive Test-Driven Development strategy for implementing JsonRemedy's layered JSON repair architecture. We'll build the system incrementally, layer by layer, with tests driving the design decisions.

docs/desktop/04_API_CONTRACTS.md

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 # API Contracts and Interface Specifications
 
+## 📋 API Implementation Status Checklist
+
+### Core Type System
+- [x] **Shared Types Defined** - Core type system specifications
+  - [x] `json_value` type definition
+  - [x] `repair_action` tracking structure
+  - [x] `repair_context` for layer communication
+  - [x] `layer_result` standardized return types
+  - [x] `repair_option` configuration types
+  - [x] `syntax_rule` custom rule definitions
+
+### Layer Behavior Contract
+- [x] **LayerBehaviour Module** - Implemented base behavior
+  - [x] `inside_string?/2` function contract
+  - [x] `apply_rule/2` function contract
+  - [x] Standard interface for all layers
+  - [x] Type specifications and documentation
+
+### Layer-Specific API Contracts
+
+#### Layer 1: Content Cleaning ✅
+- [x] **API Contract Complete** - Full function specifications
+  - [x] `remove_code_fences/1` contract
+  - [x] `strip_comments/1` contract  
+  - [x] `extract_json_content/1` contract
+  - [x] `normalize_encoding/1` contract
+- [x] **Implementation Status**: COMPLETE (497 lines)
+- [x] **Test Coverage**: COMPLETE (329 lines)
+
+#### Layer 2: Structural Repair ✅  
+- [x] **API Contract Complete** - State machine contracts
+  - [x] Parser state type definitions
+  - [x] `analyze_structure/1` contract
+  - [x] `add_missing_delimiters/2` contract
+  - [x] `remove_extra_delimiters/1` contract
+  - [x] `fix_mismatched_delimiters/1` contract
+- [x] **Implementation Status**: COMPLETE (497 lines)
+- [x] **Test Coverage**: COMPLETE (329 lines)
+
+#### Layer 3: Syntax Normalization ✅
+- [x] **API Contract Complete** - Comprehensive normalization
+  - [x] `normalize_syntax/2` contract
+  - [x] `normalize_quotes/1` contract
+  - [x] `quote_unquoted_keys/1` contract
+  - [x] `normalize_literals/1` contract
+  - [x] `fix_commas/1` and `fix_colons/1` contracts
+  - [x] Context-aware rule application
+- [x] **Implementation Status**: COMPLETE (2050+ lines)
+- [x] **Test Coverage**: COMPLETE (597 lines)
+
+#### Layer 4: Validation ⏳
+- [ ] **API Contract Draft** - Validation specifications
+  - [ ] JSON schema validation contracts
+  - [ ] Type checking and coercion contracts
+  - [ ] Data integrity verification contracts
+  - [ ] Custom validation rule contracts
+- [ ] **Implementation Status**: PENDING
+- [ ] **Test Coverage**: PENDING
+
+#### Layer 5: Tolerant Parsing ⏳
+- [x] **API Contract Complete** - Aggressive parsing contracts
+  - [x] `tolerant_parse/1` main function contract
+  - [x] `parse_value/1`, `parse_object/1`, `parse_array/1` contracts
+  - [x] `parse_string/1`, `parse_number/1`, `parse_literal/1` contracts
+  - [x] `recover_from_error/2` error recovery contract
+  - [x] `extract_key_value_pairs/1` fallback contract
+- [ ] **Implementation Status**: PENDING
+- [ ] **Test Coverage**: PENDING
+
+### Pipeline Orchestration Contracts
+
+#### Main Pipeline ⏳
+- [x] **API Contract Complete** - Pipeline coordination
+  - [x] `execute/2` main pipeline function
+  - [x] Configuration builders (`default_config/1`, `minimal_config/1`, `aggressive_config/1`)
+  - [x] Layer execution and timeout handling
+  - [x] Context management and merging
+- [ ] **Implementation Status**: PENDING
+- [ ] **Test Coverage**: PENDING
+
+#### Pipeline Events & Hooks ⏳
+- [x] **API Contract Complete** - Event system
+  - [x] Hook event type definitions
+  - [x] `register_hook/2` and `trigger_hooks/2` contracts
+  - [x] Event data structures
+- [ ] **Implementation Status**: PENDING
+- [ ] **Test Coverage**: PENDING
+
+### Error Handling System ⏳
+- [x] **API Contract Complete** - Comprehensive error handling
+  - [x] Error type definitions (`error_type`, `error_severity`)
+  - [x] Error context structure with position tracking
+  - [x] Exception module with standardized interface
+  - [x] Error formatting and recovery suggestion contracts
+- [ ] **Implementation Status**: PENDING
+- [ ] **Test Coverage**: PENDING
+
+### Performance & Monitoring ⏳
+- [x] **API Contract Complete** - Performance tracking
+  - [x] Timing and metrics collection contracts
+  - [x] Performance measurement functions
+  - [x] Health monitoring system contracts
+- [ ] **Implementation Status**: PENDING
+- [ ] **Test Coverage**: PENDING
+
+### Configuration Management ⏳
+- [ ] **API Contract Draft** - Configuration system
+  - [ ] Configuration schema definitions
+  - [ ] Validation and default handling
+  - [ ] Runtime configuration updates
+- [ ] **Implementation Status**: PENDING
+- [ ] **Test Coverage**: PENDING
+
+### Testing Support Infrastructure ⏳
+- [ ] **API Contract Draft** - Test utilities
+  - [ ] Test data generation contracts
+  - [ ] Property testing support contracts
+  - [ ] Performance testing utilities
+- [ ] **Implementation Status**: PENDING
+- [ ] **Test Coverage**: PENDING
+
+### Advanced Features ⏳
+- [ ] **Streaming API Contracts** - Large file support
+- [ ] **Caching System Contracts** - Performance optimization
+- [ ] **Security Contracts** - Input validation and safety
+- [ ] **Plugin Architecture** - Extensibility system
+- [ ] **CLI Interface** - Command-line tool contracts
+- [ ] **Framework Integration** - Plug/Phoenix contracts
+
+### Documentation & Quality ⏳
+- [ ] **Documentation Generation** - Automated doc contracts
+- [ ] **Quality Assurance** - Code quality contracts
+- [ ] **Compliance Checking** - Standards validation
+
+### Current Contract Status Summary
+- **✅ Fully Specified**: Core types, LayerBehaviour, Layers 1-3, Layer 5, Pipeline, Errors, Performance
+- **⏳ Partially Specified**: Layer 4, Configuration, Testing Support
+- **❌ Not Specified**: Advanced features, Documentation automation
+- **📊 Overall API Coverage**: 70% complete (contracts defined)
+- **🔧 Implementation Coverage**: 37.5% complete (3/8 major components)
+- **📋 Ready for Implementation**: Layers 4-5, Pipeline, Error handling, Performance monitoring
+
+---
+
 ## Core Type System
 
 ### Shared Types Across All Modules