# V2G EXI Decoder - Development Roadmap

## 📋 Current Status & Next Steps

### ✅ Completed Tasks
- [x] Clean output implementation for VC2022 -decode/-encode options
- [x] Usage message standardization across versions
- [x] DEBUG_PRINTF macro implementation for conditional debug output
- [x] Comprehensive message implementation status analysis
- [x] Documentation of current capabilities and gaps
- [x] Multi-platform build verification (C, VC2022, dotnet)

### 🎯 Next Priority: V2G Message Implementation

#### Phase 1: DC Charging Core Messages (Highest Priority) ✅ COMPLETED
Implementation order: C → VC2022 → dotnet

1. **CableCheckReq/Res** - Cable insulation state verification ✅
   - [x] C: XML parsing/generation logic
   - [x] C: EXI encoding/decoding integration
   - [x] VC2022: Port from C implementation
   - [x] dotnet: Port from C implementation
   - [x] Test with sample EXI files

2. **PreChargeReq/Res** - Pre-charging voltage matching ✅
   - [x] C: XML parsing/generation logic
   - [x] C: EXI encoding/decoding integration
   - [x] VC2022: Port from C implementation
   - [x] dotnet: Port from C implementation
   - [x] Test with sample EXI files

3. **WeldingDetectionReq/Res** - Post-charging welding detection ✅
   - [x] C: XML parsing/generation logic
   - [x] C: EXI encoding/decoding integration
   - [x] VC2022: Port from C implementation
   - [x] dotnet: Port from C implementation
   - [x] Test with sample EXI files

4. **PowerDeliveryReq/Res** - Charging start/stop control ✅
   - [x] C: XML parsing/generation logic
   - [x] C: EXI encoding/decoding integration
   - [x] VC2022: Port from C implementation
   - [x] dotnet: Port from C implementation
   - [x] Test with sample EXI files

#### Phase 2: Session & Service Management (High Priority) ✅ COMPLETED

5. **SessionSetupReq/Res** - Charging session initialization ✅
   - [x] C: XML parsing/generation logic
   - [x] VC2022: Port from C implementation
   - [x] dotnet: Port from C implementation

6. **ServiceDiscoveryReq/Res** - Available charging services discovery ✅
   - [x] C: XML parsing/generation logic
   - [x] VC2022: Port from C implementation
   - [x] dotnet: Port from C implementation

7. **AuthorizationReq/Res** - Charging authorization verification ✅
   - [x] C: XML parsing/generation logic
   - [x] VC2022: Port from C implementation
   - [x] dotnet: Port from C implementation

8. **ChargeParameterDiscoveryReq/Res** - Charging parameter exchange ✅
   - [x] C: XML parsing/generation logic
   - [x] VC2022: Port from C implementation
   - [x] dotnet: Port from C implementation

#### Phase 3: Extended Features (Medium Priority) ✅ COMPLETED

9. **PaymentServiceSelectionReq/Res** - Payment method selection ✅
   - [x] C: XML parsing/generation logic
   - [x] VC2022: Port from C implementation
   - [x] dotnet: Port from C implementation

10. **ChargingStatusReq/Res** - AC charging status (for AC support) ✅
    - [x] C: XML parsing/generation logic
    - [x] VC2022: Port from C implementation
    - [x] dotnet: Port from C implementation

11. **SessionStopReq/Res** - Charging session termination ✅
    - [x] C: XML parsing/generation logic
    - [x] VC2022: Port from C implementation
    - [x] dotnet: Port from C implementation

### 🔧 Infrastructure Improvements

#### Code Quality & Testing
- [ ] Implement comprehensive test suite for all message types
- [x] Create sample EXI files for each message type (test1-test5.exi available)
- [x] Add roundtrip testing (EXI → XML → EXI validation)
  - [x] test5.exi: 100% perfect roundtrip (43 bytes)
  - [x] Automated roundtrip validation in test scripts
- [ ] Performance benchmarking across versions

#### Build & Deployment
- [x] Automate build process for all platforms
  - [x] Windows: `build_all.bat` (MSBuild + .NET)
  - [x] Linux/macOS: `build_all.sh` (GCC + .NET)
- [x] Create automated test scripts  
  - [x] Windows: `test_all.bat`
  - [x] Linux/macOS: `test_all.sh`
- [x] Build documentation: `BUILD_INSTRUCTIONS.md`
- [ ] Add continuous integration pipeline

#### Documentation
- [ ] Create API documentation for each version
- [ ] Write usage examples for each message type
- [ ] Document ISO 15118-2 compliance status

### 📊 Success Metrics

#### Functional Requirements
- [x] Support all 8 core DC charging messages ✅
- [x] Support all 8 Session & Service Management messages ✅
- [x] Support all 6 Extended Features messages ✅
- [x] Complete 18 V2G message types across all 3 platforms ✅
- [ ] Pass ISO 15118-2 compliance validation
- [x] Maintain backward compatibility with existing CurrentDemand implementation ✅
- [x] Clean output for production use (no debug messages) ✅

#### Quality Requirements
- [ ] 100% roundtrip accuracy (EXI → XML → EXI)
- [ ] Memory safety (no buffer overflows)
- [ ] Performance parity with original C implementation
- [ ] Consistent behavior across C/VC2022/dotnet versions

### 🎯 Current Focus
**🎉 MAJOR MILESTONE ACHIEVED**: Complete V2G Decoder Implementation across all platforms!

**✅ Completed**: All 18 V2G message types implemented across C, VC2022, and .NET:
- **Phase 1**: 8 DC Charging Core Messages (CableCheck, PreCharge, WeldingDetection, PowerDelivery + CurrentDemand)
- **Phase 2**: 8 Session & Service Management Messages (SessionSetup, ServiceDiscovery, Authorization, ChargeParameterDiscovery)
- **Phase 3**: 6 Extended Features Messages (PaymentServiceSelection, ChargingStatus, SessionStop)

**Next Steps**: Infrastructure improvements, testing, and compliance validation.

### 📝 Notes
- All message structures already exist in VC2022 and dotnet versions
- Focus on XML parsing/generation logic implementation
- Maintain DEBUG_PRINTF pattern for consistent debugging
- Test each message with real V2G communication scenarios