# Enterprise Architecture Implementation Guide

## 🎯 Implementation Strategy

This guide provides step-by-step instructions for implementing the Enterprise-Grade Multi-Standard Multi-Chain DC Network.

## 📋 Implementation Checklist

### Phase 1: Foundation Setup

#### Step 1.1: Diamond Architecture Design
- [ ] Review ERC-2535 specification
- [ ] Study Nick Mudge's Diamond reference
- [ ] Design facet structure
- [ ] Plan upgrade mechanisms
- [ ] Design access control
- [ ] Create architecture diagrams
- [ ] Review with team
- [ ] Finalize design

#### Step 1.2: FireFly Infrastructure Setup
- [ ] Install FireFly
- [ ] Configure FireFly network
- [ ] Set up FireFly plugins
- [ ] Configure identity system
- [ ] Test FireFly connectivity
- [ ] Document FireFly setup

#### Step 1.3: Diamond Core Implementation
- [ ] Set up Foundry/Hardhat project
- [ ] Install Diamond dependencies
- [ ] Implement DiamondCutFacet
- [ ] Implement DiamondLoupeFacet
- [ ] Implement OwnershipFacet
- [ ] Deploy Diamond hub
- [ ] Test upgrade mechanisms

---

### Phase 2: Basic Facets

#### Step 2.1: ERC-20/ERC-777 Facet
- [ ] Implement ERC-20 interface
- [ ] Implement ERC-777 interface
- [ ] Add FireFly integration hooks
- [ ] Add CCIP bridging support
- [ ] Implement ISO 4217 mapping
- [ ] Test facet functionality
- [ ] Deploy and verify

#### Step 2.2: ERC-721/ERC-1155 Facet
- [ ] Implement ERC-721 interface
- [ ] Implement ERC-1155 interface
- [ ] Add FireFly asset management
- [ ] Add fractionalized asset support
- [ ] Test facet functionality
- [ ] Deploy and verify

---

### Phase 3: Financial Standards

#### Step 3.1: ERC-1400/ERC-1404 Facet
- [ ] Implement ERC-1400 interface
- [ ] Implement ERC-1404 interface
- [ ] Add transfer restrictions
- [ ] Add compliance features
- [ ] Integrate KYC/AML
- [ ] Test facet functionality
- [ ] Deploy and verify

#### Step 3.2: ERC-3475 Facet
- [ ] Implement ERC-3475 interface
- [ ] Add bond issuance
- [ ] Add tranche management
- [ ] Add maturity tracking
- [ ] Add interest calculations
- [ ] Test facet functionality
- [ ] Deploy and verify

#### Step 3.3: ERC-3643 Facet
- [ ] Implement ERC-3643 interface
- [ ] Add KYC/AML compliance
- [ ] Add identity verification
- [ ] Add enterprise features
- [ ] Test facet functionality
- [ ] Deploy and verify

#### Step 3.4: ERC-4626 Facet
- [ ] Implement ERC-4626 interface
- [ ] Add vault operations
- [ ] Add yield strategies
- [ ] Add collateral management
- [ ] Test facet functionality
- [ ] Deploy and verify

---

### Phase 4: ISO Standards

#### Step 4.1: ISO Registry Contract
- [ ] Design registry structure
- [ ] Implement ISO 20022 support
- [ ] Implement ISO 4217 support
- [ ] Implement ISO 8583 support
- [ ] Implement ISO 6166 support
- [ ] Implement ISO 17442 support
- [ ] Test registry functionality
- [ ] Deploy and verify

#### Step 4.2: ISO Mappings Setup
- [ ] Set up currency code mappings
- [ ] Set up securities identifier mappings
- [ ] Set up LEI mappings
- [ ] Set up payment code mappings
- [ ] Create off-chain database
- [ ] Test mappings
- [ ] Document mappings

---

### Phase 5: Integration

#### Step 5.1: FireFly Integration
- [ ] Implement private asset flows
- [ ] Implement token plugin integration
- [ ] Implement event orchestration
- [ ] Implement signature verification
- [ ] Test complete flow
- [ ] Document integration

#### Step 5.2: Bridge Module
- [ ] Implement CCIP message handling
- [ ] Implement batch settlement
- [ ] Implement FireFly signature verification
- [ ] Implement state synchronization
- [ ] Test bridge functionality
- [ ] Deploy and verify

---

### Phase 6: Advanced Features

#### Step 6.1: Governance Module
- [ ] Implement voting system
- [ ] Implement proposal management
- [ ] Implement FireFly integration
- [ ] Implement execution automation
- [ ] Test governance functions
- [ ] Deploy and verify

#### Step 6.2: Vault Module
- [ ] Implement ERC-4626 compliance
- [ ] Implement yield strategies
- [ ] Implement collateral management
- [ ] Test vault operations
- [ ] Deploy and verify

---

### Phase 7: Testing & Security

#### Step 7.1: Comprehensive Testing
- [ ] Unit tests for all facets
- [ ] Integration tests
- [ ] End-to-end tests
- [ ] Performance tests
- [ ] Security tests
- [ ] Document test results

#### Step 7.2: Security Audit
- [ ] Engage security auditor
- [ ] Provide documentation
- [ ] Address findings
- [ ] Re-test after fixes
- [ ] Finalize audit report

---

### Phase 8: Documentation & Deployment

#### Step 8.1: Documentation
- [ ] Technical documentation
- [ ] API documentation
- [ ] Integration guides
- [ ] Operational runbooks
- [ ] User guides

#### Step 8.2: Production Deployment
- [ ] Deploy to testnet
- [ ] Test on testnet
- [ ] Deploy to mainnet
- [ ] Verify deployments
- [ ] Monitor operations

---

## 🔧 Technical Implementation Details

### Diamond Implementation

#### Recommended Libraries
- Nick Mudge's Diamond reference implementation
- OpenZeppelin's access control (if compatible)
- Custom storage patterns

#### Storage Pattern
```solidity
library DiamondStorage {
    struct AppStorage {
        // Shared storage across facets
        mapping(address => uint256) balances;
        mapping(address => mapping(address => uint256)) allowances;
        // ... other shared state
    }
    
    function diamondStorage() internal pure returns (AppStorage storage ds) {
        bytes32 position = keccak256("diamond.storage");
        assembly {
            ds.slot := position
        }
    }
}
```

### Facet Implementation Pattern

```solidity
contract ERC20Facet {
    using DiamondStorage for DiamondStorage.AppStorage;
    
    function transfer(address to, uint256 amount) external returns (bool) {
        DiamondStorage.AppStorage storage ds = DiamondStorage.diamondStorage();
        // Implementation
    }
}
```

### ISO Registry Pattern

```solidity
contract ISORegistry {
    // ISO 4217: Currency codes
    mapping(string => address) public currencyCodeToToken;
    mapping(address => string) public tokenToCurrencyCode;
    
    // ISO 6166: Securities identifiers
    mapping(string => address) public isinToContract;
    mapping(address => string) public contractToIsin;
    
    // ISO 17442: Legal Entity Identifiers
    mapping(string => EntityInfo) public leiToEntity;
    mapping(address => string) public entityToLei;
    
    // Events
    event CurrencyCodeRegistered(string code, address token);
    event ISINRegistered(string isin, address contract);
    event LEIRegistered(string lei, address entity);
}
```

---

## 🧪 Testing Strategy

### Unit Testing
- Test each facet independently
- Test upgrade mechanisms
- Test access controls
- Test ISO mappings

### Integration Testing
- Test facet interactions
- Test FireFly integration
- Test CCIP integration
- Test cross-chain flows

### End-to-End Testing
- Complete flow: Besu → FireFly → Ethereum
- Test all ERC standards
- Test ISO compliance
- Test error scenarios

---

## 📊 Deployment Checklist

### Pre-Deployment
- [ ] All contracts compiled
- [ ] All tests passing
- [ ] Security audit completed
- [ ] Documentation complete
- [ ] Monitoring configured

### Deployment
- [ ] Deploy Diamond hub
- [ ] Deploy all facets
- [ ] Deploy Registry contract
- [ ] Configure FireFly
- [ ] Set up CCIP integration

### Post-Deployment
- [ ] Verify all contracts
- [ ] Test all functions
- [ ] Monitor operations
- [ ] Set up alerts
- [ ] Document addresses

---

## 🚀 Quick Start Commands

### Diamond Deployment
```bash
# Deploy Diamond hub
forge script script/DeployDiamond.s.sol --rpc-url $RPC_URL --broadcast

# Add first facet
cast send $DIAMOND_ADDRESS "diamondCut((address,uint8,bytes4[])[],address,bytes)" ... --rpc-url $RPC_URL
```

### FireFly Setup
```bash
# Start FireFly
firefly start

# Configure plugins
firefly plugins configure

# Test connectivity
firefly test
```

### ISO Registry Setup
```bash
# Deploy registry
forge script script/DeployISORegistry.s.sol --rpc-url $RPC_URL --broadcast

# Register currency codes
cast send $REGISTRY_ADDRESS "registerCurrencyCode(string,address)" "USD" $TOKEN_ADDRESS --rpc-url $RPC_URL
```

---

## 📚 Resources

### Diamond Standard
- ERC-2535: https://eips.ethereum.org/EIPS/eip-2535
- Nick Mudge's Reference: https://github.com/mudgen/diamond
- Diamond Documentation: https://eip2535diamonds.substack.com/

### ERC Standards
- ERC-20: https://eips.ethereum.org/EIPS/eip-20
- ERC-777: https://eips.ethereum.org/EIPS/eip-777
- ERC-721: https://eips.ethereum.org/EIPS/eip-721
- ERC-1155: https://eips.ethereum.org/EIPS/eip-1155
- ERC-1400: https://eips.ethereum.org/EIPS/eip-1400
- ERC-1404: https://eips.ethereum.org/EIPS/eip-1404
- ERC-3475: https://eips.ethereum.org/EIPS/eip-3475
- ERC-3643: https://eips.ethereum.org/EIPS/eip-3643
- ERC-4626: https://eips.ethereum.org/EIPS/eip-4626

### ISO Standards
- ISO 20022: https://www.iso20022.org/
- ISO 4217: https://www.iso.org/iso-4217-currency-codes.html
- ISO 8583: https://www.iso.org/standard/31628.html
- ISO 6166: https://www.iso.org/standard/44732.html
- ISO 17442: https://www.iso.org/standard/59771.html

### FireFly
- FireFly Documentation: https://hyperledger.github.io/firefly/
- FireFly GitHub: https://github.com/hyperledger/firefly
