Elysia Real Estate: Build Sustainable Property Yield Tokenization Platform

// PropertyToken.sol - Main tokenization contract
pragma solidity ^0.8.19;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "./YieldDistributor.sol";
import "./SustainabilityTracker.sol";

contract PropertyToken is ERC20, Ownable {
    struct PropertyDetails {
        string propertyAddress;
        uint256 totalValue;
        uint256 tokenSupply;
        uint256 monthlyYield;
        bool isActive;
    }
    
    PropertyDetails public property;
    YieldDistributor public yieldContract;
    SustainabilityTracker public sustainabilityContract;
    
    mapping(address => uint256) public lastClaimTime;
    
    event YieldDistributed(address indexed holder, uint256 amount);
    event PropertyUpdated(string newAddress, uint256 newValue);
    
    constructor(
        string memory _name,
        string memory _symbol,
        string memory _propertyAddress,
        uint256 _totalValue,
        uint256 _tokenSupply
    ) ERC20(_name, _symbol) {
        property = PropertyDetails({
            propertyAddress: _propertyAddress,
            totalValue: _totalValue,
            tokenSupply: _tokenSupply,
            monthlyYield: 0,
            isActive: true
        });
        
        _mint(msg.sender, _tokenSupply);
        
        // Deploy associated contracts
        yieldContract = new YieldDistributor(address(this));
        sustainabilityContract = new SustainabilityTracker(_propertyAddress);
    }
    
    // Calculate holder's share of monthly yield
    function calculateYieldShare(address holder) public view returns (uint256) {
        uint256 holderBalance = balanceOf(holder);
        if (holderBalance == 0) return 0;
        
        uint256 sharePercentage = (holderBalance * 10000) / property.tokenSupply;
        return (property.monthlyYield * sharePercentage) / 10000;
    }
    
    // Distribute yield to token holders
    function distributeYield() external onlyOwner {
        require(property.monthlyYield > 0, "No yield to distribute");
        
        // Get all token holders from events (simplified for demo)
        address[] memory holders = yieldContract.getActiveHolders();
        
        for (uint i = 0; i < holders.length; i++) {
            uint256 yieldAmount = calculateYieldShare(holders[i]);
            if (yieldAmount > 0) {
                yieldContract.distributeToHolder(holders[i], yieldAmount);
                emit YieldDistributed(holders[i], yieldAmount);
            }
        }
    }
    
    // Update property value and yield
    function updatePropertyMetrics(
        uint256 _newValue,
        uint256 _newMonthlyYield
    ) external onlyOwner {
        property.totalValue = _newValue;
        property.monthlyYield = _newMonthlyYield;
        
        // Update sustainability metrics
        sustainabilityContract.updateMetrics(_newValue);
    }
}

// YieldDistributor.sol - Handles automated yield payments
pragma solidity ^0.8.19;

import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

contract YieldDistributor is ReentrancyGuard {
    address public propertyToken;
    address public paymentToken; // USDC or USDT for stable payments
    
    struct YieldSchedule {
        uint256 amount;
        uint256 distributionDate;
        bool distributed;
    }
    
    mapping(uint256 => YieldSchedule) public yieldSchedules;
    mapping(address => uint256) public accumulatedYield;
    address[] public activeHolders;
    
    uint256 public currentScheduleId;
    
    event YieldScheduled(uint256 indexed scheduleId, uint256 amount, uint256 date);
    event YieldClaimed(address indexed holder, uint256 amount);
    
    modifier onlyPropertyToken() {
        require(msg.sender == propertyToken, "Only property token contract");
        _;
    }
    
    constructor(address _propertyToken) {
        propertyToken = _propertyToken;
        paymentToken = 0xA0b86a33E6411c8c28C8b707b9cb3fB67B2f66b6; // USDC on mainnet
    }
    
    // Schedule monthly yield distribution
    function scheduleYield(uint256 _amount, uint256 _distributionDate) 
        external 
        onlyPropertyToken 
    {
        currentScheduleId++;
        yieldSchedules[currentScheduleId] = YieldSchedule({
            amount: _amount,
            distributionDate: _distributionDate,
            distributed: false
        });
        
        emit YieldScheduled(currentScheduleId, _amount, _distributionDate);
    }
    
    // Distribute yield to specific holder
    function distributeToHolder(address _holder, uint256 _amount) 
        external 
        onlyPropertyToken 
        nonReentrant 
    {
        accumulatedYield[_holder] += _amount;
        
        // Add to active holders if not already present
        bool holderExists = false;
        for (uint i = 0; i < activeHolders.length; i++) {
            if (activeHolders[i] == _holder) {
                holderExists = true;
                break;
            }
        }
        
        if (!holderExists) {
            activeHolders.push(_holder);
        }
    }
    
    // Claim accumulated yield
    function claimYield() external nonReentrant {
        uint256 claimAmount = accumulatedYield[msg.sender];
        require(claimAmount > 0, "No yield to claim");
        
        accumulatedYield[msg.sender] = 0;
        
        // Transfer payment token to holder
        IERC20(paymentToken).transfer(msg.sender, claimAmount);
        
        emit YieldClaimed(msg.sender, claimAmount);
    }
    
    // Get list of active token holders
    function getActiveHolders() external view returns (address[] memory) {
        return activeHolders;
    }
    
    // Check claimable yield for address
    function getClaimableYield(address _holder) external view returns (uint256) {
        return accumulatedYield[_holder];
    }
}

// SustainabilityTracker.sol - Tracks environmental metrics
pragma solidity ^0.8.19;

contract SustainabilityTracker {
    struct SustainabilityMetrics {
        uint256 carbonFootprint; // kg CO2 per year
        uint256 energyEfficiencyRating; // 1-100 scale
        uint256 renewableEnergyPercentage; // 0-100%
        uint256 waterUsageOptimization; // 1-100 scale
        uint256 wasteReductionScore; // 1-100 scale
        uint256 lastUpdated;
    }
    
    mapping(string => SustainabilityMetrics) public propertyMetrics;
    mapping(string => uint256[]) public historicalScores;
    
    string public propertyAddress;
    uint256 public sustainabilityScore;
    
    event MetricsUpdated(string indexed property, uint256 newScore);
    event CarbonOffsetPurchased(string indexed property, uint256 amount);
    
    constructor(string memory _propertyAddress) {
        propertyAddress = _propertyAddress;
    }
    
    // Update sustainability metrics
    function updateMetrics(uint256 _propertyValue) external {
        SustainabilityMetrics storage metrics = propertyMetrics[propertyAddress];
        
        // Calculate overall sustainability score (weighted average)
        uint256 newScore = (
            metrics.energyEfficiencyRating * 25 +
            metrics.renewableEnergyPercentage * 20 +
            metrics.waterUsageOptimization * 15 +
            metrics.wasteReductionScore * 15 +
            (100 - (metrics.carbonFootprint / 1000)) * 25 // Inverse carbon footprint
        ) / 100;
        
        sustainabilityScore = newScore;
        metrics.lastUpdated = block.timestamp;
        
        // Store historical data
        historicalScores[propertyAddress].push(newScore);
        
        emit MetricsUpdated(propertyAddress, newScore);
    }
    
    // Purchase carbon offsets with yield
    function purchaseCarbonOffsets(uint256 _offsetAmount) external {
        // In real implementation, this would integrate with carbon offset providers
        SustainabilityMetrics storage metrics = propertyMetrics[propertyAddress];
        
        // Reduce carbon footprint
        if (metrics.carbonFootprint > _offsetAmount) {
            metrics.carbonFootprint -= _offsetAmount;
        } else {
            metrics.carbonFootprint = 0;
        }
        
        emit CarbonOffsetPurchased(propertyAddress, _offsetAmount);
        
        // Recalculate sustainability score
        updateMetrics(0);
    }
    
    // Get sustainability report
    function getSustainabilityReport() external view returns (
        uint256 score,
        uint256 carbonFootprint,
        uint256 energyRating,
        uint256 renewablePercentage
    ) {
        SustainabilityMetrics memory metrics = propertyMetrics[propertyAddress];
        return (
            sustainabilityScore,
            metrics.carbonFootprint,
            metrics.energyEfficiencyRating,
            metrics.renewableEnergyPercentage
        );
    }
    
    // Set initial sustainability data
    function setInitialMetrics(
        uint256 _carbonFootprint,
        uint256 _energyRating,
        uint256 _renewablePercentage,
        uint256 _waterOptimization,
        uint256 _wasteReduction
    ) external {
        propertyMetrics[propertyAddress] = SustainabilityMetrics({
            carbonFootprint: _carbonFootprint,
            energyEfficiencyRating: _energyRating,
            renewableEnergyPercentage: _renewablePercentage,
            waterUsageOptimization: _waterOptimization,
            wasteReductionScore: _wasteReduction,
            lastUpdated: block.timestamp
        });
        
        updateMetrics(0);
    }
}

// PropertyDashboard.jsx - Main property management interface
import React, { useState, useEffect } from 'react';
import { ethers } from 'ethers';
import PropertyTokenABI from './contracts/PropertyToken.json';
import YieldDistributorABI from './contracts/YieldDistributor.json';

const PropertyDashboard = ({ propertyAddress }) => {
    const [propertyData, setPropertyData] = useState(null);
    const [userBalance, setUserBalance] = useState(0);
    const [claimableYield, setClaimableYield] = useState(0);
    const [sustainabilityScore, setSustainabilityScore] = useState(0);
    const [isLoading, setIsLoading] = useState(true);
    
    // Contract instances
    const [propertyContract, setPropertyContract] = useState(null);
    const [yieldContract, setYieldContract] = useState(null);
    
    useEffect(() => {
        initializeContracts();
    }, [propertyAddress]);
    
    const initializeContracts = async () => {
        try {
            // Connect to user's wallet
            const provider = new ethers.providers.Web3Provider(window.ethereum);
            const signer = provider.getSigner();
            
            // Initialize property token contract
            const propContract = new ethers.Contract(
                propertyAddress,
                PropertyTokenABI.abi,
                signer
            );
            
            // Get yield distributor address
            const yieldAddress = await propContract.yieldContract();
            const yieldDistributor = new ethers.Contract(
                yieldAddress,
                YieldDistributorABI.abi,
                signer
            );
            
            setPropertyContract(propContract);
            setYieldContract(yieldDistributor);
            
            // Load property data
            await loadPropertyData(propContract, yieldDistributor);
            
        } catch (error) {
            console.error('Failed to initialize contracts:', error);
        }
    };
    
    const loadPropertyData = async (propContract, yieldDistributor) => {
        try {
            const userAddress = await propContract.signer.getAddress();
            
            // Get property details
            const property = await propContract.property();
            const userTokens = await propContract.balanceOf(userAddress);
            const claimable = await yieldDistributor.getClaimableYield(userAddress);
            
            // Get sustainability score
            const sustainabilityAddress = await propContract.sustainabilityContract();
            const sustainabilityContract = new ethers.Contract(
                sustainabilityAddress,
                [
                    "function getSustainabilityReport() view returns (uint256, uint256, uint256, uint256)"
                ],
                propContract.signer
            );
            
            const [score] = await sustainabilityContract.getSustainabilityReport();
            
            setPropertyData({
                address: property.propertyAddress,
                totalValue: ethers.utils.formatEther(property.totalValue),
                tokenSupply: property.tokenSupply.toString(),
                monthlyYield: ethers.utils.formatEther(property.monthlyYield),
                isActive: property.isActive
            });
            
            setUserBalance(ethers.utils.formatEther(userTokens));
            setClaimableYield(ethers.utils.formatUnits(claimable, 6)); // USDC has 6 decimals
            setSustainabilityScore(score.toNumber());
            setIsLoading(false);
            
        } catch (error) {
            console.error('Failed to load property data:', error);
            setIsLoading(false);
        }
    };
    
    const claimYield = async () => {
        try {
            const tx = await yieldContract.claimYield();
            await tx.wait();
            
            // Refresh claimable yield
            const userAddress = await propertyContract.signer.getAddress();
            const claimable = await yieldContract.getClaimableYield(userAddress);
            setClaimableYield(ethers.utils.formatUnits(claimable, 6));
            
            alert('Yield claimed successfully!');
        } catch (error) {
            console.error('Failed to claim yield:', error);
            alert('Failed to claim yield. Please try again.');
        }
    };
    
    if (isLoading) {
        return <div className="loading">Loading property data...</div>;
    }
    
    return (
        <div className="property-dashboard">
            <div className="property-header">
                <h1>Property Token Dashboard</h1>
                <div className="property-address">{propertyData?.address}</div>
            </div>
            
            <div className="dashboard-grid">
                {/* Property Overview */}
                <div className="card property-overview">
                    <h2>Property Overview</h2>
                    <div className="metric">
                        <span className="label">Total Value:</span>
                        <span className="value">${propertyData?.totalValue} ETH</span>
                    </div>
                    <div className="metric">
                        <span className="label">Token Supply:</span>
                        <span className="value">{propertyData?.tokenSupply}</span>
                    </div>
                    <div className="metric">
                        <span className="label">Monthly Yield:</span>
                        <span className="value">${propertyData?.monthlyYield} ETH</span>
                    </div>
                    <div className="metric">
                        <span className="label">Status:</span>
                        <span className={`status ${propertyData?.isActive ? 'active' : 'inactive'}`}>
                            {propertyData?.isActive ? 'Active' : 'Inactive'}
                        </span>
                    </div>
                </div>
                
                {/* User Holdings */}
                <div className="card user-holdings">
                    <h2>Your Holdings</h2>
                    <div className="metric">
                        <span className="label">Token Balance:</span>
                        <span className="value">{userBalance}</span>
                    </div>
                    <div className="metric">
                        <span className="label">Ownership Percentage:</span>
                        <span className="value">
                            {((userBalance / propertyData?.tokenSupply) * 100).toFixed(2)}%
                        </span>
                    </div>
                    <div className="metric">
                        <span className="label">Claimable Yield:</span>
                        <span className="value">${claimableYield} USDC</span>
                    </div>
                    <button 
                        className="claim-button"
                        onClick={claimYield}
                        disabled={parseFloat(claimableYield) === 0}
                    >
                        Claim Yield
                    </button>
                </div>
                
                {/* Sustainability Metrics */}
                <div className="card sustainability">
                    <h2>Sustainability Score</h2>
                    <div className="score-circle">
                        <div className="score-value">{sustainabilityScore}</div>
                        <div className="score-label">/ 100</div>
                    </div>
                    <div className="score-description">
                        {sustainabilityScore >= 80 && "Excellent sustainability performance"}
                        {sustainabilityScore >= 60 && sustainabilityScore < 80 && "Good sustainability practices"}
                        {sustainabilityScore >= 40 && sustainabilityScore < 60 && "Moderate sustainability efforts"}
                        {sustainabilityScore < 40 && "Needs sustainability improvements"}
                    </div>
                </div>
            </div>
        </div>
    );
};

export default PropertyDashboard;

// hardhat.config.js - Deployment configuration
require("@nomicfoundation/hardhat-toolbox");
require("dotenv").config();

module.exports = {
  solidity: {
    version: "0.8.19",
    settings: {
      optimizer: {
        enabled: true,
        runs: 200
      }
    }
  },
  networks: {
    sepolia: {
      url: process.env.SEPOLIA_RPC_URL,
      accounts: [process.env.PRIVATE_KEY]
    },
    mainnet: {
      url: process.env.MAINNET_RPC_URL,
      accounts: [process.env.PRIVATE_KEY]
    }
  },
  etherscan: {
    apiKey: process.env.ETHERSCAN_API_KEY
  }
};

// scripts/deploy.js - Deploy all contracts
const hre = require("hardhat");

async function main() {
  console.log("Deploying Elysia Property Tokenization Platform...");
  
  // Property details for deployment
  const propertyName = "Tokyo Apartment Complex Token";
  const propertySymbol = "TACT";
  const propertyAddress = "123 Shibuya Street, Tokyo, Japan";
  const totalValue = hre.ethers.utils.parseEther("1000000"); // 1M ETH value
  const tokenSupply = hre.ethers.utils.parseEther("10000"); // 10K tokens
  
  // Deploy PropertyToken contract
  const PropertyToken = await hre.ethers.getContractFactory("PropertyToken");
  const propertyToken = await PropertyToken.deploy(
    propertyName,
    propertySymbol,
    propertyAddress,
    totalValue,
    tokenSupply
  );
  
  await propertyToken.deployed();
  console.log("PropertyToken deployed to:", propertyToken.address);
  
  // Get deployed contract addresses
  const yieldDistributorAddress = await propertyToken.yieldContract();
  const sustainabilityTrackerAddress = await propertyToken.sustainabilityContract();
  
  console.log("YieldDistributor deployed to:", yieldDistributorAddress);
  console.log("SustainabilityTracker deployed to:", sustainabilityTrackerAddress);
  
  // Set initial sustainability metrics
  const SustainabilityTracker = await hre.ethers.getContractFactory("SustainabilityTracker");
  const sustainabilityTracker = SustainabilityTracker.attach(sustainabilityTrackerAddress);
  
  await sustainabilityTracker.setInitialMetrics(
    50000, // 50 tons CO2 per year
    75,    // 75% energy efficiency
    60,    // 60% renewable energy
    80,    // 80% water optimization
    70     // 70% waste reduction
  );
  
  console.log("Initial sustainability metrics set");
  
  // Verify contracts on Etherscan
  if (hre.network.name !== "hardhat") {
    console.log("Verifying contracts...");
    await hre.run("verify:verify", {
      address: propertyToken.address,
      constructorArguments: [
        propertyName,
        propertySymbol,
        propertyAddress,
        totalValue,
        tokenSupply
      ]
    });
  }
  
  console.log("\nDeployment Summary:");
  console.log("==================");
  console.log(`PropertyToken: ${propertyToken.address}`);
  console.log(`YieldDistributor: ${yieldDistributorAddress}`);
  console.log(`SustainabilityTracker: ${sustainabilityTrackerAddress}`);
}

main()
  .then(() => process.exit(0))
  .catch((error) => {
    console.error(error);
    process.exit(1);
  });

// test/PropertyToken.test.js - Comprehensive testing
const { expect } = require("chai");
const { ethers } = require("hardhat");

describe("PropertyToken", function() {
  let propertyToken, yieldDistributor, sustainabilityTracker;
  let owner, investor1, investor2;
  
  beforeEach(async function() {
    [owner, investor1, investor2] = await ethers.getSigners();
    
    const PropertyToken = await ethers.getContractFactory("PropertyToken");
    propertyToken = await PropertyToken.deploy(
      "Test Property",
      "TEST",
      "123 Test Street",
      ethers.utils.parseEther("1000"),
      ethers.utils.parseEther("1000")
    );
    
    const yieldAddress = await propertyToken.yieldContract();
    const sustainabilityAddress = await propertyToken.sustainabilityContract();
    
    yieldDistributor = await ethers.getContractAt("YieldDistributor", yieldAddress);
    sustainabilityTracker = await ethers.getContractAt("SustainabilityTracker", sustainabilityAddress);
  });
  
  describe("Property Tokenization", function() {
    it("Should deploy with correct initial values", async function() {
      const property = await propertyToken.property();
      expect(property.propertyAddress).to.equal("123 Test Street");
      expect(property.totalValue).to.equal(ethers.utils.parseEther("1000"));
      expect(property.tokenSupply).to.equal(ethers.utils.parseEther("1000"));
    });
    
    it("Should mint initial tokens to owner", async function() {
      const balance = await propertyToken.balanceOf(owner.address);
      expect(balance).to.equal(ethers.utils.parseEther("1000"));
    });
  });
  
  describe("Yield Distribution", function() {
    beforeEach(async function() {
      // Transfer tokens to investors
      await propertyToken.transfer(investor1.address, ethers.utils.parseEther("300"));
      await propertyToken.transfer(investor2.address, ethers.utils.parseEther("200"));
      
      // Set monthly yield
      await propertyToken.updatePropertyMetrics(
        ethers.utils.parseEther("1000"),
        ethers.utils.parseEther("10") // 10 ETH monthly yield
      );
    });
    
    it("Should calculate correct yield share", async function() {
      const yieldShare = await propertyToken.calculateYieldShare(investor1.address);
      const expectedShare = ethers.utils.parseEther("3"); // 30% of 10 ETH
      expect(yieldShare).to.equal(expectedShare);
    });
    
    it("Should distribute yield to holders", async function() {
      await propertyToken.distributeYield();
      
      const claimableYield1 = await yieldDistributor.getClaimableYield(investor1.address);
      const claimableYield2 = await yieldDistributor.getClaimableYield(investor2.address);
      
      expect(claimableYield1).to.equal(ethers.utils.parseEther("3"));
      expect(claimableYield2).to.equal(ethers.utils.parseEther("2"));
    });
  });
  
  describe("Sustainability Tracking", function() {
    it("Should set initial sustainability metrics", async function() {
      await sustainabilityTracker.setInitialMetrics(
        50000, // Carbon footprint
        80,    // Energy efficiency
        70,    // Renewable energy
        85,    // Water optimization
        75     // Waste reduction
      );
      
      const score = await sustainabilityTracker.sustainabilityScore();
      expect(score).to.be.greaterThan(0);
    });
    
    it("Should update sustainability score correctly", async function() {
      await sustainabilityTracker.setInitialMetrics(50000, 80, 70, 85, 75);
      const initialScore = await sustainabilityTracker.sustainabilityScore();
      
      // Purchase carbon offsets
      await sustainabilityTracker.purchaseCarbonOffsets(10000);
      
      const newScore = await sustainabilityTracker.sustainabilityScore();
      expect(newScore).to.be.greaterThan(initialScore);
    });
  });
});

// CrossChainBridge.sol - Bridge tokens between chains
pragma solidity ^0.8.19;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "./interfaces/ILayerZeroEndpoint.sol";

contract CrossChainBridge {
    ILayerZeroEndpoint public endpoint;
    mapping(uint16 => bytes) public bridgeAddresses;
    mapping(address => bool) public supportedTokens;
    
    event TokensBridged(
        address indexed token,
        address indexed user,
        uint256 amount,
        uint16 destinationChain
    );
    
    constructor(address _endpoint) {
        endpoint = ILayerZeroEndpoint(_endpoint);
    }
    
    function bridgeTokens(
        address _token,
        uint256 _amount,
        uint16 _destinationChain,
        address _recipient
    ) external payable {
        require(supportedTokens[_token], "Token not supported");
        
        // Lock tokens
        IERC20(_token).transferFrom(msg.sender, address(this), _amount);
        
        // Prepare cross-chain message
        bytes memory payload = abi.encode(_token, _recipient, _amount);
        
        // Send cross-chain message
        endpoint.send{value: msg.value}(
            _destinationChain,
            bridgeAddresses[_destinationChain],
            payload,
            payable(msg.sender),
            address(0),
            bytes("")
        );
        
        emit TokensBridged(_token, msg.sender, _amount, _destinationChain);
    }
}

// DeFiIntegration.sol - Stake property tokens in DeFi protocols
pragma solidity ^0.8.19;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "./interfaces/ICompound.sol";
import "./interfaces/IAave.sol";

contract DeFiIntegration {
    mapping(address => uint256) public stakedAmounts;
    mapping(address => address) public preferredProtocol;
    
    // Protocol addresses
    address public compoundCToken;
    address public aavePool;
    
    event TokensStaked(address indexed user, uint256 amount, address protocol);
    event YieldHarvested(address indexed user, uint256 amount);
    
    function stakeInCompound(address _token, uint256 _amount) external {
        IERC20(_token).transferFrom(msg.sender, address(this), _amount);
        
        // Approve and supply to Compound
        IERC20(_token).approve(compoundCToken, _amount);
        ICompound(compoundCToken).mint(_amount);
        
        stakedAmounts[msg.sender] += _amount;
        preferredProtocol[msg.sender] = compoundCToken;
        
        emit TokensStaked(msg.sender, _amount, compoundCToken);
    }
    
    function harvestYield() external {
        require(stakedAmounts[msg.sender] > 0, "No staked tokens");
        
        address protocol = preferredProtocol[msg.sender];
        uint256 yield;
        
        if (protocol == compoundCToken) {
            // Calculate Compound yield
            yield = ICompound(compoundCToken).balanceOfUnderlying(address(this)) - stakedAmounts[msg.sender];
            if (yield > 0) {
                ICompound(compoundCToken).redeemUnderlying(yield);
            }
        }
        
        if (yield > 0) {
            // Transfer yield to user
            IERC20(protocol).transfer(msg.sender, yield);
            emit YieldHarvested(msg.sender, yield);
        }
    }
}

// ComplianceManager.js - Handle regulatory requirements
class ComplianceManager {
    constructor(jurisdiction) {
        this.jurisdiction = jurisdiction;
        this.kycProvider = new KYCProvider();
        this.accreditationChecker = new AccreditationChecker();
    }
    
    async validateInvestor(address, investmentAmount) {
        // Check KYC status
        const kycStatus = await this.kycProvider.getStatus(address);
        if (!kycStatus.approved) {
            throw new Error('KYC verification required');
        }
        
        // Check accreditation for large investments
        if (investmentAmount > 50000) { // $50K threshold
            const accredited = await this.accreditationChecker.verify(address);
            if (!accredited) {
                throw new Error('Accredited investor status required');
            }
        }
        
        // Check jurisdiction restrictions
        const allowedJurisdictions = ['US', 'EU', 'UK', 'SG', 'JP'];
        if (!allowedJurisdictions.includes(kycStatus.jurisdiction)) {
            throw new Error('Investment not available in your jurisdiction');
        }
        
        return true;
    }
    
    generateComplianceReport(propertyAddress) {
        return {
            totalInvestors: this.getTotalInvestors(propertyAddress),
            jurisdictionBreakdown: this.getJurisdictionBreakdown(propertyAddress),
            accreditedInvestorPercentage: this.getAccreditedPercentage(propertyAddress),
            complianceStatus: 'COMPLIANT',
            lastAuditDate: new Date().toISOString()
        };
    }
}

// ValuationService.js - Real estate valuation integration
class ValuationService {
    constructor() {
        this.providers = {
            zillow: new ZillowAPI(process.env.ZILLOW_API_KEY),
            rentometer: new RentometerAPI(process.env.RENTOMETER_API_KEY),
            mashvisor: new MashvisorAPI(process.env.MASHVISOR_API_KEY)
        };
    }
    
    async getPropertyValuation(address, propertyType) {
        const valuations = await Promise.all([
            this.providers.zillow.getEstimate(address),
            this.providers.rentometer.getRentEstimate(address),
            this.providers.mashvisor.getInvestmentMetrics(address)
        ]);
        
        // Calculate weighted average valuation
        const weights = { zillow: 0.4, rentometer: 0.3, mashvisor: 0.3 };
        const weightedValue = valuations.reduce((sum, val, index) => {
            const provider = Object.keys(weights)[index];
            return sum + (val.estimatedValue * weights[provider]);
        }, 0);
        
        return {
            currentValue: Math.round(weightedValue),
            monthlyRent: valuations[1].monthlyRent,
            capRate: valuations[2].capRate,
            cashOnCash: valuations[2].cashOnCashReturn,
            lastUpdated: new Date().toISOString(),
            confidence: this.calculateConfidence(valuations)
        };
    }
    
    calculateConfidence(valuations) {
        // Calculate confidence based on variance between estimates
        const values = valuations.map(v => v.estimatedValue);
        const mean = values.reduce((a, b) => a + b) / values.length;
        const variance = values.reduce((sum, val) => sum + Math.pow(val - mean, 2), 0) / values.length;
        const coefficient = Math.sqrt(variance) / mean;
        
        // Higher confidence when estimates are close
        return Math.max(0, 100 - (coefficient * 100));
    }
}

// PropertyManager.js - Automated property management
class PropertyManager {
    constructor(propertyAddress, contractAddress) {
        this.propertyAddress = propertyAddress;
        this.contractAddress = contractAddress;
        this.sensors = new IoTSensorNetwork();
        this.maintenanceSystem = new MaintenanceSystem();
        this.tenantPortal = new TenantPortal();
    }
    
    async monitorProperty() {
        const sensorData = await this.sensors.getAllReadings(this.propertyAddress);
        
        // Check for maintenance issues
        const issues = this.detectIssues(sensorData);
        if (issues.length > 0) {
            await this.scheduleMaintenanceOrders(issues);
        }
        
        // Update energy efficiency metrics
        const energyMetrics = this.calculateEnergyEfficiency(sensorData);
        await this.updateSustainabilityScore(energyMetrics);
        
        // Monitor occupancy and rent collection
        const occupancyData = await this.tenantPortal.getOccupancyStatus();
        await this.updateYieldProjections(occupancyData);
        
        return {
            sensorData,
            issues,
            energyMetrics,
            occupancyData
        };
    }
    
    detectIssues(sensorData) {
        const issues = [];
        
        // Water leak detection
        if (sensorData.waterFlow > sensorData.baseline.waterFlow * 1.5) {
            issues.push({
                type: 'WATER_LEAK',
                severity: 'HIGH',
                location: sensorData.waterSensors.find(s => s.anomaly).location,
                estimatedCost: 2500
            });
        }
        
        // HVAC efficiency monitoring
        if (sensorData.energyUsage > sensorData.baseline.energyUsage * 1.3) {
            issues.push({
                type: 'HVAC_INEFFICIENCY',
                severity: 'MEDIUM',
                estimatedCost: 1500,
                potentialSavings: 300 // Monthly
            });
        }
        
        return issues;
    }
    
    async scheduleMaintenanceOrders(issues) {
        for (const issue of issues) {
            const order = await this.maintenanceSystem.createOrder({
                property: this.propertyAddress,
                type: issue.type,
                priority: issue.severity,
                estimatedCost: issue.estimatedCost,
                description: `Automated detection: ${issue.type}`,
                scheduledDate: this.calculateOptimalScheduleDate(issue)
            });
            
            // Notify token holders of significant expenses
            if (issue.estimatedCost > 1000) {
                await this.notifyTokenHolders(issue, order);
            }
        }
    }
    
    async updateSustainabilityScore(energyMetrics) {
        // Calculate new sustainability metrics
        const sustainabilityData = {
            energyEfficiency: energyMetrics.efficiency,
            renewablePercentage: energyMetrics.renewableUsage,
            carbonFootprint: energyMetrics.carbonEmissions,
            waterUsage: energyMetrics.waterConsumption
        };
        
        // Update on-chain sustainability tracker
        const contract = new ethers.Contract(
            this.contractAddress,
            PropertyTokenABI,
            provider
        );
        
        const sustainabilityAddress = await contract.sustainabilityContract();
        const sustainabilityContract = new ethers.Contract(
            sustainabilityAddress,
            SustainabilityTrackerABI,
            signer
        );
        
        await sustainabilityContract.updateMetrics(0); // Trigger recalculation
    }
}

// SecurityModule.sol - Enhanced security features
pragma solidity ^0.8.19;

import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/security/Pausable.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";

contract SecurityModule is ReentrancyGuard, Pausable, AccessControl {
    bytes32 public constant ADMIN_ROLE = keccak256("ADMIN_ROLE");
    bytes32 public constant OPERATOR_ROLE = keccak256("OPERATOR_ROLE");
    
    // Emergency controls
    mapping(address => bool) public emergencyStop;
    mapping(address => uint256) public lastActivity;
    
    // Transaction limits
    uint256 public maxTransactionAmount = 1000 * 10**18; // 1000 tokens
    uint256 public dailyTransactionLimit = 5000 * 10**18; // 5000 tokens
    mapping(address => uint256) public dailyTransactionAmount;
    mapping(address => uint256) public lastTransactionDate;
    
    event SecurityAlert(address indexed user, string alertType, uint256 amount);
    event TransactionBlocked(address indexed user, uint256 amount, string reason);
    
    modifier withinTransactionLimits(uint256 amount) {
        require(amount <= maxTransactionAmount, "Transaction exceeds maximum limit");
        
        // Check daily limit
        if (block.timestamp / 86400 != lastTransactionDate[msg.sender] / 86400) {
            dailyTransactionAmount[msg.sender] = 0;
        }
        
        require(
            dailyTransactionAmount[msg.sender] + amount <= dailyTransactionLimit,
            "Daily transaction limit exceeded"
        );
        
        dailyTransactionAmount[msg.sender] += amount;
        lastTransactionDate[msg.sender] = block.timestamp;
        _;
    }
    
    modifier notInEmergencyStop() {
        require(!emergencyStop[msg.sender], "Account in emergency stop");
        _;
    }
    
    // Detect suspicious activity
    function checkSuspiciousActivity(address user, uint256 amount) internal {
        uint256 timeSinceLastActivity = block.timestamp - lastActivity[user];
        
        // Flag rapid large transactions
        if (timeSinceLastActivity < 300 && amount > maxTransactionAmount / 2) { // 5 minutes
            emit SecurityAlert(user, "RAPID_LARGE_TRANSACTION", amount);
        }
        
        // Flag unusual transaction patterns
        if (amount > dailyTransactionAmount[user] * 3) {
            emit SecurityAlert(user, "UNUSUAL_TRANSACTION_SIZE", amount);
        }
        
        lastActivity[user] = block.timestamp;
    }
    
    // Emergency stop for specific address
    function emergencyStopAddress(address user) external onlyRole(ADMIN_ROLE) {
        emergencyStop[user] = true;
    }
    
    // Multi-signature requirement for large operations
    mapping(bytes32 => uint256) public multiSigProposals;
    mapping(bytes32 => mapping(address => bool)) public multiSigVotes;
    
    function proposeMultiSigOperation(
        string memory operation,
        bytes memory data
    ) external onlyRole(OPERATOR_ROLE) returns (bytes32) {
        bytes32 proposalId = keccak256(abi.encodePacked(operation, data, block.timestamp));
        multiSigProposals[proposalId] = block.timestamp;
        return proposalId;
    }
    
    function voteMultiSigOperation(bytes32 proposalId) external onlyRole(ADMIN_ROLE) {
        require(multiSigProposals[proposalId] != 0, "Proposal does not exist");
        require(!multiSigVotes[proposalId][msg.sender], "Already voted");
        
        multiSigVotes[proposalId][msg.sender] = true;
    }
}

// OptimizedPropertyToken.sol - Gas-optimized version
pragma solidity ^0.8.19;

contract OptimizedPropertyToken {
    // Pack structs to save storage slots
    struct PackedProperty {
        uint128 totalValue;    // Reduced from uint256
        uint128 monthlyYield;  // Reduced from uint256
        uint64 lastUpdated;    // Use uint64 for timestamps
        bool isActive;         // Boolean fits in same slot
    }
    
    // Use mappings instead of arrays when possible
    mapping(address => uint256) private _balances;
    mapping(address => uint256) public lastClaimTime;
    
    // Batch operations to reduce gas costs
    function batchTransfer(
        address[] calldata recipients,
        uint256[] calldata amounts
    ) external {
        require(recipients.length == amounts.length, "Array length mismatch");
        
        uint256 totalTransfer = 0;
        for (uint256 i = 0; i < recipients.length; i++) {
            totalTransfer += amounts[i];
            _balances[recipients[i]] += amounts[i];
        }
        
        require(_balances[msg.sender] >= totalTransfer, "Insufficient balance");
        _balances[msg.sender] -= totalTransfer;
    }
    
    // Use events for data that doesn't need on-chain storage
    event YieldCalculated(address indexed holder, uint256 amount, uint256 timestamp);
    
    function calculateAndEmitYield(address[] calldata holders) external {
        for (uint256 i = 0; i < holders.length; i++) {
            uint256 yield = _calculateYield(holders[i]);
            emit YieldCalculated(holders[i], yield, block.timestamp);
        }
    }
    
    // Internal function to reduce contract size
    function _calculateYield(address holder) internal view returns (uint256) {
        // Yield calculation logic
        return (_balances[holder] * 100) / 10000; // Simplified example
    }
}

// L2Deployment.js - Layer 2 deployment configuration
const deployToLayer2 = async (network) => {
    const configs = {
        polygon: {
            rpcUrl: process.env.POLYGON_RPC_URL,
            chainId: 137,
            gasPrice: '30000000000', // 30 gwei
            confirmations: 2
        },
        arbitrum: {
            rpcUrl: process.env.ARBITRUM_RPC_URL,
            chainId: 42161,
            gasPrice: '100000000', // 0.1 gwei
            confirmations: 1
        },
        optimism: {
            rpcUrl: process.env.OPTIMISM_RPC_URL,
            chainId: 10,
            gasPrice: '1000000', // 0.001 gwei
            confirmations: 1
        }
    };
    
    const config = configs[network];
    if (!config) {
        throw new Error(`Unsupported network: ${network}`);
    }
    
    console.log(`Deploying to ${network}...`);
    
    // Deploy with L2-specific optimizations
    const PropertyToken = await ethers.getContractFactory("OptimizedPropertyToken");
    const propertyToken = await PropertyToken.deploy({
        gasPrice: config.gasPrice,
        gasLimit: 2000000
    });
    
    await propertyToken.deployTransaction.wait(config.confirmations);
    
    console.log(`PropertyToken deployed to ${network}:`, propertyToken.address);
    
    // Set up cross-chain bridge if needed
    if (network !== 'mainnet') {
        await setupCrossChainBridge(propertyToken.address, network);
    }
    
    return propertyToken.address;
};

// AnalyticsDashboard.jsx - Property performance analytics
import React, { useState, useEffect } from 'react';
import { LineChart, Line, XAxis, YAxis, CartesianGrid, Tooltip, ResponsiveContainer, PieChart, Pie, Cell } from 'recharts';

const AnalyticsDashboard = ({ propertyAddress }) => {
    const [analytics, setAnalytics] = useState(null);
    const [timeframe, setTimeframe] = useState('30d');
    
    useEffect(() => {
        loadAnalytics();
    }, [propertyAddress, timeframe]);
    
    const loadAnalytics = async () => {
        try {
            // Fetch analytics data from your backend API
            const response = await fetch(`/api/analytics/${propertyAddress}?timeframe=${timeframe}`);
            const data = await response.json();
            setAnalytics(data);
        } catch (error) {
            console.error('Failed to load analytics:', error);
        }
    };
    
    if (!analytics) {
        return <div>Loading analytics...</div>;
    }
    
    const COLORS = ['#0088FE', '#00C49F', '#FFBB28', '#FF8042', '#8884D8'];
    
    return (
        <div className="analytics-dashboard">
            <div className="dashboard-header">
                <h1>Property Analytics Dashboard</h1>
                <div className="timeframe-selector">
                    <button 
                        className={timeframe === '7d' ? 'active' : ''}
                        onClick={() => setTimeframe('7d')}
                    >
                        7 Days
                    </button>
                    <button 
                        className={timeframe === '30d' ? 'active' : ''}
                        onClick={() => setTimeframe('30d')}
                    >
                        30 Days
                    </button>
                    <button 
                        className={timeframe === '90d' ? 'active' : ''}
                        onClick={() => setTimeframe('90d')}
                    >
                        90 Days
                    </button>
                </div>
            </div>
            
            <div className="metrics-grid">
                {/* Key Performance Indicators */}
                <div className="metric-card">
                    <h3>Total Value Locked</h3>
                    <div className="metric-value">${analytics.tvl.toLocaleString()}</div>
                    <div className="metric-change positive">+{analytics.tvlChange}%</div>
                </div>
                
                <div className="metric-card">
                    <h3>Monthly Yield Rate</h3>
                    <div className="metric-value">{analytics.yieldRate}%</div>
                    <div className="metric-change positive">+{analytics.yieldChange}%</div>
                </div>
                
                <div className="metric-card">
                    <h3>Active Investors</h3>
                    <div className="metric-value">{analytics.activeInvestors}</div>
                    <div className="metric-change positive">+{analytics.investorGrowth}%</div>
                </div>
                
                <div className="metric-card">
                    <h3>Sustainability Score</h3>
                    <div className="metric-value">{analytics.sustainabilityScore}/100</div>
                    <div className="metric-change positive">+{analytics.sustainabilityImprovement}</div>
                </div>
            </div>
            
            <div className="charts-grid">
                {/* Yield Distribution Over Time */}
                <div className="chart-container">
                    <h3>Yield Distribution History</h3>
                    <ResponsiveContainer width="100%" height={300}>
                        <LineChart data={analytics.yieldHistory}>
                            <CartesianGrid strokeDasharray="3 3" />
                            <XAxis dataKey="date" />
                            <YAxis />
                            <Tooltip />
                            <Line 
                                type="monotone" 
                                dataKey="yield" 
                                stroke="#8884d8" 
                                strokeWidth={2}
                            />
                        </LineChart>
                    </ResponsiveContainer>
                </div>
                
                {/* Token Holder Distribution */}
                <div className="chart-container">
                    <h3>Token Holder Distribution</h3>
                    <ResponsiveContainer width="100%" height={300}>
                        <PieChart>
                            <Pie
                                data={analytics.holderDistribution}
                                cx="50%"
                                cy="50%"
                                outerRadius={80}
                                fill="#8884d8"
                                dataKey="value"
                                label
                            >
                                {analytics.holderDistribution.map((entry, index) => (
                                    <Cell key={`cell-${index}`} fill={COLORS[index % COLORS.length]} />
                                ))}
                            </Pie>
                            <Tooltip />
                        </PieChart>
                    </ResponsiveContainer>
                </div>
                
                {/* Property Value Trend */}
                <div className="chart-container">
                    <h3>Property Valuation Trend</h3>
                    <ResponsiveContainer width="100%" height={300}>
                        <LineChart data={analytics.valuationHistory}>
                            <CartesianGrid strokeDasharray="3 3" />
                            <XAxis dataKey="date" />
                            <YAxis />
                            <Tooltip />
                            <Line 
                                type="monotone" 
                                dataKey="valuation" 
                                stroke="#82ca9d" 
                                strokeWidth={2}
                            />
                            <Line 
                                type="monotone" 
                                dataKey="marketAverage" 
                                stroke="#ffc658" 
                                strokeWidth={1}
                                strokeDasharray="5 5"
                            />
                        </LineChart>
                    </ResponsiveContainer>
                </div>
                
                {/* Sustainability Metrics */}
                <div className="chart-container">
                    <h3>Sustainability Improvements</h3>
                    <div className="sustainability-metrics">
                        <div className="sustainability-item">
                            <span className="label">Energy Efficiency</span>
                            <div className="progress-bar">
                                <div 
                                    className="progress-fill" 
                                    style={{width: `${analytics.sustainability.energyEfficiency}%`}}
                                ></div>
                            </div>
                            <span className="value">{analytics.sustainability.energyEfficiency}%</span>
                        </div>
                        
                        <div className="sustainability-item">
                            <span className="label">Renewable Energy</span>
                            <div className="progress-bar">
                                <div 
                                    className="progress-fill renewable" 
                                    style={{width: `${analytics.sustainability.renewableEnergy}%`}}
                                ></div>
                            </div>
                            <span className="value">{analytics.sustainability.renewableEnergy}%</span>
                        </div>
                        
                        <div className="sustainability-item">
                            <span className="label">Carbon Reduction</span>
                            <div className="progress-bar">
                                <div 
                                    className="progress-fill carbon" 
                                    style={{width: `${analytics.sustainability.carbonReduction}%`}}
                                ></div>
                            </div>
                            <span className="value">{analytics.sustainability.carbonReduction}%</span>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    );
};

export default AnalyticsDashboard;