TitleChain Foundation

// Enhanced USAT Reserve Management with Treasury Launch
contract USATReserveManager {
    struct ReserveComposition {
        uint256 goldReserves;      // Troy ounces * 1e6 (micro-ounces)
        uint256 treasuryBonds;     // USD value * 1e18
        uint256 bitcoinReserves;   // Satoshis
        uint256 fiatReserves;      // USD cash * 1e18
        uint256 lastRebalance;     // Timestamp
    }
    
    ReserveComposition public reserves;
    uint256 public constant TREASURY_SUPPLY = 1_000_000_000 * 1e18; // 1B USAT
    uint256 public constant TARGET_GOLD_RATIO = 40;     // 40%
    uint256 public constant TARGET_TREASURY_RATIO = 35; // 35%
    uint256 public constant TARGET_BITCOIN_RATIO = 15;  // 15%
    uint256 public constant TARGET_FIAT_RATIO = 10;     // 10%
    
    // Treasury Launch - Pre-mint entire supply
    constructor(address _treasury, address _registry) 
        ERC20("Unified Sovereign Asset Token", "USAT")
    {
        treasury = _treasury;
        registry = ITitleChainRegistry(_registry);
        
        // Pre-mint 1B USAT to treasury with 18 decimals
        _mint(treasury, TREASURY_SUPPLY);
        
        emit TreasuryInitialized(treasury, TREASURY_SUPPLY);
    }
    
    // Step 2: USAT Issuance with TCID Tracking
    function mintUSAT(
        address to,
        uint256 usdAmount,
        bytes calldata zkProof
    ) external onlyOwner {
        require(hasAdequateReserves(usdAmount), "Insufficient backing reserves");
        
        // Issue TitleChain ID for provenance
        bytes32 tcid = registry.issueTCID(to, usdAmount, zkProof);
        
        // Transfer from treasury to investor
        uint256 tokenAmount = usdAmount * 1e18;
        _transfer(treasury, to, tokenAmount);
        
        // Update reserve ratios
        updateReserveRatios(usdAmount);
        
        emit USATMinted(to, usdAmount, tcid);
    }
    
    // Credian NEO Optimizer Integration
    function optimizeReserves() external onlyCredianNEO {
        uint256 totalValue = getTotalReserveValue();
        uint256 targetGold = (totalValue * TARGET_GOLD_RATIO) / 100;
        uint256 targetTreasury = (totalValue * TARGET_TREASURY_RATIO) / 100;
        uint256 targetBitcoin = (totalValue * TARGET_BITCOIN_RATIO) / 100;
        uint256 targetFiat = (totalValue * TARGET_FIAT_RATIO) / 100;
        
        // Execute rebalancing through x402 M5 Protocol
        executeRebalancing(targetGold, targetTreasury, targetBitcoin, targetFiat);
        
        reserves.lastRebalance = block.timestamp;
        emit ReservesOptimized(totalValue, block.timestamp);
    }
}

// Sovereign Title Token System - Parent/Child NFT Structure
contract SovereignTitleToken {
    struct BondInfo {
        uint256 parentNFT;          // Parent NFT token ID
        address childContract;      // Child token contract address
        uint256 totalSupply;        // Total child tokens (1.35M)
        address vaultAddress;       // M5Capital cold vault
        bool isActive;              // Bond status
    }
    
    mapping(uint256 => BondInfo) public bonds;
    uint256 public nextBondId = 1;
    
    // Step 3: Gold Bond Creation
    function createBond(
        string calldata name_,           // "Portuguese Creek Gold Bond"
        string calldata symbol_,         // "STT-0" 
        uint256 totalChildSupply,        // 1,350,000
        address vaultAddress             // M5Capital cold vault
    ) external onlyOwner returns (uint256 bondId) {
        bondId = nextBondId++;
        
        // Mint Parent NFT to vault (represents full legal title)
        _mint(vaultAddress, bondId);
        
        // Deploy child token contract
        SovereignTitleToken stt = new SovereignTitleToken(
            name_, 
            symbol_, 
            bondId, 
            vaultAddress,
            totalChildSupply
        );
        
        // Mint all child tokens to vault initially
        stt.mintBatch(vaultAddress, totalChildSupply);
        
        // Record the bond structure
        bonds[bondId] = BondInfo({
            parentNFT: bondId,
            childContract: address(stt),
            totalSupply: totalChildSupply,
            vaultAddress: vaultAddress,
            isActive: true
        });
        
        emit BondCreated(bondId, address(stt), totalChildSupply, vaultAddress);
    }
    
    // Redemption: Burn all child tokens to claim Parent NFT
    function redeemBond(uint256 bondId) external {
        BondInfo storage bond = bonds[bondId];
        require(bond.isActive, "Bond not active");
        
        SovereignTitleToken stt = SovereignTitleToken(bond.childContract);
        
        // Verify holder owns all child tokens
        require(stt.balanceOf(msg.sender) == bond.totalSupply, "Insufficient STT tokens");
        
        // Burn all child tokens
        stt.burnBatch(msg.sender, bond.totalSupply);
        
        // Transfer Parent NFT from vault to redeemer
        _transfer(bond.vaultAddress, msg.sender, bondId);
        
        // Deactivate bond
        bond.isActive = false;
        
        emit BondRedeemed(bondId, msg.sender, bond.totalSupply);
    }
}

// Mining Offtake Agreement with Smart Contract Escrow
contract MiningOfftakeEscrow {
    struct OfftakeAgreement {
        bytes32 offtakeId;
        string mineName;
        address mineOperator;
        uint256 quantityMGI;          // Total troy ounces
        uint256 pricePerOz;           // Price per ounce
        uint256 durationMonths;       // Agreement duration
        uint256 escrowBalance;        // USAT held in escrow
        uint256 deliveredQuantity;    // Delivered so far
        bytes32 tcid;                 // TitleChain ID
        uint256 startDate;
        bool isActive;
    }
    
    mapping(bytes32 => OfftakeAgreement) public offtakes;
    
    // Step 4: Create Mining Offtake Agreement
    function createOfftake(
        string calldata mineName,        // "Portuguese Creek Mine"
        uint256 quantityMGI,             // 1,350,000 (troy oz)
        uint256 pricePerOz,              // 1750 * 1e18 ($1,750/oz)
        uint256 durationMonths,          // 36 months
        address mineOperator,            // Mining company address
        bytes calldata zkProof           // Proof of gold reserves
    ) external onlyOwner {
        bytes32 offtakeId = keccak256(
            abi.encodePacked(mineName, mineOperator, block.timestamp)
        );
        require(offtakes[offtakeId].offtakeId == bytes32(0), "Agreement exists");

        // Calculate total contract value
        uint256 totalValue = quantityMGI * pricePerOz;
        
        // Issue TCID for the entire offtake quantity
        bytes32 tcid = registry.issueTCID(address(this), totalValue, zkProof);

        // Transfer USAT from treasury to escrow
        require(usatToken.balanceOf(treasury) >= totalValue, "Insufficient treasury");
        usatToken.transferFrom(treasury, address(this), totalValue);

        // Create the offtake agreement
        offtakes[offtakeId] = OfftakeAgreement({
            offtakeId: offtakeId,
            mineName: mineName,
            mineOperator: mineOperator,
            quantityMGI: quantityMGI,
            pricePerOz: pricePerOz,
            durationMonths: durationMonths,
            escrowBalance: totalValue,
            deliveredQuantity: 0,
            tcid: tcid,
            startDate: block.timestamp,
            isActive: true
        });

        emit OfftakeCreated(offtakeId, mineName, quantityMGI, pricePerOz, tcid);
    }
    
    // Monthly milestone releases
    function releasePayment(
        bytes32 offtakeId,
        uint256 deliveredOunces,
        bytes calldata deliveryProof
    ) external onlyMineOperator(offtakeId) {
        OfftakeAgreement storage offtake = offtakes[offtakeId];
        require(offtake.isActive, "Agreement not active");
        
        // Verify delivery proof through TitleChain
        require(registry.verifyDelivery(offtake.tcid, deliveredOunces, deliveryProof), "Invalid delivery proof");
        
        // Calculate payment amount
        uint256 paymentAmount = deliveredOunces * offtake.pricePerOz;
        require(offtake.escrowBalance >= paymentAmount, "Insufficient escrow");
        
        // Release payment to mine operator
        usatToken.transfer(offtake.mineOperator, paymentAmount);
        
        // Update agreement state
        offtake.deliveredQuantity += deliveredOunces;
        offtake.escrowBalance -= paymentAmount;
        
        emit PaymentReleased(offtakeId, deliveredOunces, paymentAmount);
    }
}