去中心化金融与电影融资：从银行信贷到DeFi借贷池

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "@openzeppelin/contracts/access/AccessControl.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";

contract FilmDeFiLending is AccessControl, ReentrancyGuard {
    bytes32 public constant POOL_MANAGER_ROLE = keccak256("POOL_MANAGER_ROLE");
    bytes32 public constant LIQUIDATOR_ROLE = keccak256("LIQUIDATOR_ROLE");

    enum FilmStatus {
        PRE_PRODUCTION,
        PRODUCTION,
        POST_PRODUCTION,
        DISTRIBUTION,
        COMPLETED,
        FAILED
    }

    enum LoanStatus {
        PENDING,
        ACTIVE,
        REPAID,
        DEFAULTED,
        LIQUIDATED,
        RESTRUCTURED
    }

    enum CollateralType {
        NFT_IP,
        PRESALE_CONTRACT,
        DISTRIBUTION_RIGHTS,
        REVENUE_SHARE,
        COMPLETION_BOND,
        MIXED
    }

    struct FilmProject {
        uint256 projectId;
        address creator;
        string title;
        string ipfsCID;             // IPFS hash of project docs
        uint256 totalBudget;
        uint256 raisedAmount;
        FilmStatus status;
        uint256 createdAt;
        uint256 estimatedCompletion;
        address[] investors;
        bool isVerified;
        bool isFunded;
    }

    struct Loan {
        uint256 loanId;
        uint256 projectId;
        address borrower;
        address lender;
        uint256 amount;
        uint256 interestRate;       // Annual interest rate in basis points (1% = 100)
        uint256 duration;           // Loan duration in seconds
        uint256 startTime;
        uint256 endTime;
        LoanStatus status;
        CollateralType collateralType;
        address collateralAddress;
        uint256 collateralId;
        uint256 ltvRatio;           // Loan-to-Value ratio (0-10000)
        uint256 liquidationThreshold;
        bool isRestructured;
        uint256 repaidAmount;
    }

    struct LendingPool {
        uint256 poolId;
        string poolName;
        address poolToken;
        uint256 totalDeposits;
        uint256 totalLoans;
        uint256 availableLiquidity;
        uint256 utilizationRate;
        uint256 baseRate;
        uint256 variableRate;
        uint256 reserveFactor;
        bool isActive;
    }

    struct RevenueShare {
        uint256 shareId;
        uint256 projectId;
        address revenueSource;
        uint256 totalRevenue;
        uint256 distributedAmount;
        uint256 distributionRatio;
        uint256 lastDistribution;
        bool isActive;
    }

    mapping(uint256 => FilmProject) public filmProjects;
    mapping(uint256 => Loan) public loans;
    mapping(uint256 => LendingPool) public lendingPools;
    mapping(uint256 => RevenueShare) public revenueShares;
    mapping(address => uint256[]) public creatorProjects;
    mapping(address => uint256[]) public investorLoans;
    mapping(address => uint256) public userDeposits;

    uint256 private _projectCounter;
    uint256 private _loanCounter;
    uint256 private _poolCounter;
    uint256 private _shareCounter;

    uint256 public constant MIN_LOAN_DURATION = 30 days;
    uint256 public constant MAX_LOAN_DURATION = 365 days;
    uint256 public constant DEFAULT_LIQUIDATION_THRESHOLD = 8000; // 80%
    uint256 public constant MIN_LTV = 1000;   // 10%
    uint256 public constant MAX_LTV = 6000;   // 60%

    event FilmProjectCreated(
        uint256 indexed projectId,
        address indexed creator,
        string title,
        uint256 totalBudget
    );

    event LoanIssued(
        uint256 indexed loanId,
        uint256 indexed projectId,
        address indexed borrower,
        uint256 amount,
        uint256 interestRate
    );

    event LoanRepaid(
        uint256 indexed loanId,
        uint256 repaidAmount,
        uint256 interestPaid
    );

    event LoanDefaulted(
        uint256 indexed loanId,
        uint256 collateralValue
    );

    event PoolDeposited(
        uint256 indexed poolId,
        address indexed depositor,
        uint256 amount
    );

    event RevenueDistributed(
        uint256 indexed shareId,
        uint256 amount,
        uint256 timestamp
    );

    modifier onlyCreator(uint256 _projectId) {
        require(filmProjects[_projectId].creator == msg.sender, "Not project creator");
        _;
    }

    constructor() {
        _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
        _grantRole(POOL_MANAGER_ROLE, msg.sender);
        _grantRole(LIQUIDATOR_ROLE, msg.sender);
    }

    function createFilmProject(
        string memory _title,
        string memory _ipfsCID,
        uint256 _totalBudget,
        uint256 _estimatedCompletion
    ) external returns (uint256) {
        _projectCounter++;
        uint256 projectId = _projectCounter;

        filmProjects[projectId] = FilmProject({
            projectId: projectId,
            creator: msg.sender,
            title: _title,
            ipfsCID: _ipfsCID,
            totalBudget: _totalBudget,
            raisedAmount: 0,
            status: FilmStatus.PRE_PRODUCTION,
            createdAt: block.timestamp,
            estimatedCompletion: _estimatedCompletion,
            investors: new address[](0),
            isVerified: false,
            isFunded: false
        });

        creatorProjects[msg.sender].push(projectId);

        emit FilmProjectCreated(projectId, msg.sender, _title, _totalBudget);
        return projectId;
    }

    function createLendingPool(
        string memory _poolName,
        address _poolToken,
        uint256 _baseRate,
        uint256 _variableRate,
        uint256 _reserveFactor
    ) external onlyRole(POOL_MANAGER_ROLE) returns (uint256) {
        require(_baseRate <= 5000, "Base rate too high");
        require(_variableRate <= 10000, "Variable rate too high");
        require(_reserveFactor <= 2000, "Reserve factor too high");

        _poolCounter++;
        uint256 poolId = _poolCounter;

        lendingPools[poolId] = LendingPool({
            poolId: poolId,
            poolName: _poolName,
            poolToken: _poolToken,
            totalDeposits: 0,
            totalLoans: 0,
            availableLiquidity: 0,
            utilizationRate: 0,
            baseRate: _baseRate,
            variableRate: _variableRate,
            reserveFactor: _reserveFactor,
            isActive: true
        });

        return poolId;
    }

    function depositToPool(
        uint256 _poolId,
        uint256 _amount
    ) external nonReentrant returns (bool) {
        LendingPool storage pool = lendingPools[_poolId];
        require(pool.isActive, "Pool not active");

        IERC20(pool.poolToken).transferFrom(msg.sender, address(this), _amount);

        pool.totalDeposits += _amount;
        pool.availableLiquidity += _amount;
        userDeposits[msg.sender] += _amount;

        emit PoolDeposited(_poolId, msg.sender, _amount);
        return true;
    }

    function requestLoan(
        uint256 _projectId,
        uint256 _amount,
        uint256 _interestRate,
        uint256 _duration,
        CollateralType _collateralType,
        address _collateralAddress,
        uint256 _collateralId,
        uint256 _ltvRatio
    ) external onlyCreator(_projectId) returns (uint256) {
        FilmProject storage project = filmProjects[_projectId];
        require(project.status == FilmStatus.PRE_PRODUCTION, "Invalid project status");
        require(_amount <= project.totalBudget - project.raisedAmount, "Amount exceeds remaining budget");
        require(_duration >= MIN_LOAN_DURATION && _duration <= MAX_LOAN_DURATION, "Invalid duration");
        require(_ltvRatio >= MIN_LTV && _ltvRatio <= MAX_LTV, "Invalid LTV ratio");

        _loanCounter++;
        uint256 loanId = _loanCounter;

        loans[loanId] = Loan({
            loanId: loanId,
            projectId: _projectId,
            borrower: msg.sender,
            lender: address(0),
            amount: _amount,
            interestRate: _interestRate,
            duration: _duration,
            startTime: 0,
            endTime: 0,
            status: LoanStatus.PENDING,
            collateralType: _collateralType,
            collateralAddress: _collateralAddress,
            collateralId: _collateralId,
            ltvRatio: _ltvRatio,
            liquidationThreshold: DEFAULT_LIQUIDATION_THRESHOLD,
            isRestructured: false,
            repaidAmount: 0
        });

        emit LoanIssued(loanId, _projectId, msg.sender, _amount, _interestRate);
        return loanId;
    }

    function fundLoan(
        uint256 _loanId,
        uint256 _poolId
    ) external nonReentrant onlyRole(POOL_MANAGER_ROLE) {
        Loan storage loan = loans[_loanId];
        LendingPool storage pool = lendingPools[_poolId];
        require(loan.status == LoanStatus.PENDING, "Loan not pending");
        require(pool.availableLiquidity >= loan.amount, "Insufficient liquidity");

        loan.status = LoanStatus.ACTIVE;
        loan.lender = address(this);
        loan.startTime = block.timestamp;
        loan.endTime = block.timestamp + loan.duration;

        pool.totalLoans += loan.amount;
        pool.availableLiquidity -= loan.amount;
        _updateUtilizationRate(_poolId);

        FilmProject storage project = filmProjects[loan.projectId];
        project.raisedAmount += loan.amount;
        project.investors.push(msg.sender);

        // Transfer funds to borrower
        IERC20(pool.poolToken).transfer(loan.borrower, loan.amount);
    }

    function repayLoan(uint256 _loanId, uint256 _amount) external nonReentrant {
        Loan storage loan = loans[_loanId];
        require(loan.status == LoanStatus.ACTIVE, "Loan not active");
        require(msg.sender == loan.borrower, "Not borrower");
        require(_amount <= _calculateTotalOwed(_loanId), "Overpayment");

        uint256 interest = _calculateInterest(_loanId);
        uint256 totalOwed = loan.amount + interest;

        IERC20(lendingPools[1].poolToken).transferFrom(msg.sender, address(this), _amount);

        loan.repaidAmount += _amount;
        if (loan.repaidAmount >= totalOwed) {
            loan.status = LoanStatus.REPAID;
            FilmProject storage project = filmProjects[loan.projectId];
            project.raisedAmount -= loan.amount;
        }

        emit LoanRepaid(_loanId, _amount, interest);
    }

    function liquidateLoan(uint256 _loanId) external onlyRole(LIQUIDATOR_ROLE) {
        Loan storage loan = loans[_loanId];
        require(loan.status == LoanStatus.ACTIVE, "Loan not active");
        require(block.timestamp > loan.endTime, "Loan not expired");

        loan.status = LoanStatus.LIQUIDATED;

        // Transfer collateral to liquidator
        IERC721(loan.collateralAddress).transferFrom(loan.borrower, msg.sender, loan.collateralId);

        emit LoanDefaulted(_loanId, loan.amount);
    }

    function createRevenueShare(
        uint256 _projectId,
        address _revenueSource,
        uint256 _distributionRatio
    ) external onlyRole(POOL_MANAGER_ROLE) returns (uint256) {
        require(_distributionRatio <= 10000, "Invalid ratio");

        _shareCounter++;
        uint256 shareId = _shareCounter;

        revenueShares[shareId] = RevenueShare({
            shareId: shareId,
            projectId: _projectId,
            revenueSource: _revenueSource,
            totalRevenue: 0,
            distributedAmount: 0,
            distributionRatio: _distributionRatio,
            lastDistribution: 0,
            isActive: true
        });

        return shareId;
    }

    function distributeRevenue(uint256 _shareId, uint256 _amount) external {
        RevenueShare storage share = revenueShares[_shareId];
        require(share.isActive, "Share not active");

        share.totalRevenue += _amount;
        share.distributedAmount += _amount;
        share.lastDistribution = block.timestamp;

        // Distribute to investors based on their loan participation
        FilmProject storage project = filmProjects[share.projectId];
        for (uint256 i = 0; i < project.investors.length; i++) {
            // Distribution logic
        }

        emit RevenueDistributed(_shareId, _amount, block.timestamp);
    }

    function _calculateInterest(uint256 _loanId) internal view returns (uint256) {
        Loan storage loan = loans[_loanId];
        if (loan.startTime == 0) return 0;
        uint256 elapsed = block.timestamp - loan.startTime;
        return (loan.amount * loan.interestRate * elapsed) / (10000 * 365 days);
    }

    function _calculateTotalOwed(uint256 _loanId) internal view returns (uint256) {
        return loans[_loanId].amount + _calculateInterest(_loanId);
    }

    function _updateUtilizationRate(uint256 _poolId) internal {
        LendingPool storage pool = lendingPools[_poolId];
        if (pool.totalDeposits > 0) {
            pool.utilizationRate = (pool.totalLoans * 10000) / pool.totalDeposits;
        }
    }

    function getProjectInfo(uint256 _projectId) external view returns (FilmProject memory) {
        return filmProjects[_projectId];
    }

    function getLoanDetails(uint256 _loanId) external view returns (Loan memory) {
        return loans[_loanId];
    }

    function getPoolInfo(uint256 _poolId) external view returns (LendingPool memory) {
        return lendingPools[_poolId];
    }
}

import json
import time
import hashlib
from dataclasses import dataclass
from typing import Dict, List, Optional, Tuple
from enum import Enum

class ProjectStatus(Enum):
    PRE_PRODUCTION = "pre_production"
    PRODUCTION = "production"
    POST_PRODUCTION = "post_production"
    DISTRIBUTION = "distribution"
    COMPLETED = "completed"
    FAILED = "failed"

class LoanStatus(Enum):
    PENDING = "pending"
    ACTIVE = "active"
    REPAID = "repaid"
    DEFAULTED = "defaulted"
    LIQUIDATED = "liquidated"

class CollateralType(Enum):
    NFT_IP = "nft_ip"
    PRESALE = "presale_contract"
    DISTRIBUTION = "distribution_rights"
    REVENUE = "revenue_share"
    BOND = "completion_bond"

@dataclass
class FilmProject:
    project_id: int
    creator: str
    title: str
    budget: int
    raised: int
    status: ProjectStatus
    created_at: int
    investors: List[str]

@dataclass
class FilmLoan:
    loan_id: int
    project_id: int
    borrower: str
    amount: int
    interest_rate: float
    duration: int
    start_time: int
    end_time: int
    status: LoanStatus
    collateral_type: CollateralType
    collateral_value: int
    ltv: float
    repaid: int

@dataclass
class LendingPool:
    pool_id: int
    name: str
    total_deposits: int
    total_loans: int
    available: int
    base_rate: float
    utilization_rate: float


class FilmDeFiPlatform:
    """
    电影DeFi借贷平台：从银行信贷到链上借贷池
    """

    def __init__(self):
        self.projects: Dict[int, FilmProject] = {}
        self.loans: Dict[int, FilmLoan] = {}
        self.pools: Dict[int, LendingPool] = {}
        self.project_counter = 0
        self.loan_counter = 0
        self.pool_counter = 0

    def create_film_project(
        self,
        creator: str,
        title: str,
        budget: int
    ) -> int:
        self.project_counter += 1
        project_id = self.project_counter

        project = FilmProject(
            project_id=project_id,
            creator=creator,
            title=title,
            budget=budget,
            raised=0,
            status=ProjectStatus.PRE_PRODUCTION,
            created_at=int(time.time()),
            investors=[]
        )

        self.projects[project_id] = project

        print(f"[电影项目] #{project_id}: {title}")
        print(f"  创作者: {creator[:8]}, 预算: ${budget:,}")
        print(f"  状态: {project.status.value}")

        return project_id

    def create_lending_pool(
        self,
        name: str,
        base_rate: float
    ) -> int:
        self.pool_counter += 1
        pool_id = self.pool_counter

        pool = LendingPool(
            pool_id=pool_id,
            name=name,
            total_deposits=0,
            total_loans=0,
            available=0,
            base_rate=base_rate,
            utilization_rate=0.0
        )

        self.pools[pool_id] = pool

        print(f"[借贷池] #{pool_id}: {name}")
        print(f"  基础利率: {base_rate:.2%}")

        return pool_id

    def deposit(self, pool_id: int, depositor: str, amount: int) -> bool:
        if pool_id not in self.pools:
            raise ValueError(f"池 #{pool_id} 不存在")

        pool = self.pools[pool_id]
        pool.total_deposits += amount
        pool.available += amount

        print(f"[存款] {depositor[:8]} → 池 #{pool_id}: ${amount:,}")
        return True

    def request_loan(
        self,
        project_id: int,
        borrower: str,
        amount: int,
        duration: int,
        collateral_type: CollateralType,
        collateral_value: int
    ) -> int:
        if project_id not in self.projects:
            raise ValueError(f"项目 #{project_id} 不存在")

        project = self.projects[project_id]
        if project.creator != borrower:
            raise ValueError("只有项目创建者可以借款")

        # LTV计算
        ltv = amount / collateral_value if collateral_value > 0 else 0
        if ltv > 0.6:
            raise ValueError(f"LTV {ltv:.1%} 超过最大值 60%")

        self.loan_counter += 1
        loan_id = self.loan_counter

        # 利率计算（基于利用率）
        rate = self._calculate_rate(1)  # 简化版

        loan = FilmLoan(
            loan_id=loan_id,
            project_id=project_id,
            borrower=borrower,
            amount=amount,
            interest_rate=rate,
            duration=duration,
            start_time=0,
            end_time=0,
            status=LoanStatus.PENDING,
            collateral_type=collateral_type,
            collateral_value=collateral_value,
            ltv=ltv,
            repaid=0
        )

        self.loans[loan_id] = loan

        print(f"[贷款请求] #{loan_id}: 项目 #{project_id}")
        print(f"  借款人: {borrower[:8]}, 金额: ${amount:,}")
        print(f"  抵押: {collateral_type.value} (${collateral_value:,})")
        print(f"  LTV: {ltv:.1%}, 利率: {rate:.2%}")

        return loan_id

    def fund_loan(self, loan_id: int, pool_id: int) -> bool:
        if loan_id not in self.loans:
            raise ValueError(f"贷款 #{loan_id} 不存在")
        if pool_id not in self.pools:
            raise ValueError(f"池 #{pool_id} 不存在")

        loan = self.loans[loan_id]
        pool = self.pools[pool_id]

        if loan.status != LoanStatus.PENDING:
            raise ValueError(f"贷款 #{loan_id} 不是 PENDING 状态")
        if pool.available < loan.amount:
            raise ValueError(f"池 #{pool_id} 流动性不足")

        loan.status = LoanStatus.ACTIVE
        loan.start_time = int(time.time())
        loan.end_time = int(time.time()) + loan.duration

        pool.total_loans += loan.amount
        pool.available -= loan.amount
        pool.utilization_rate = pool.total_loans / pool.total_deposits if pool.total_deposits > 0 else 0

        project = self.projects[loan.project_id]
        project.raised += loan.amount
        project.investors.append("pool_" + str(pool_id))

        print(f"[贷款发放] #{loan_id}: ${loan.amount:,}")
        print(f"  池: #{pool_id}, 利用率: {pool.utilization_rate:.1%}")
        print(f"  到期: {time.strftime('%Y-%m-%d', time.gmtime(loan.end_time))}")

        return True

    def repay_loan(self, loan_id: int, amount: int) -> bool:
        if loan_id not in self.loans:
            raise ValueError(f"贷款 #{loan_id} 不存在")

        loan = self.loans[loan_id]
        if loan.status != LoanStatus.ACTIVE:
            raise ValueError(f"贷款 #{loan_id} 不是 ACTIVE 状态")

        interest = self._calculate_interest(loan)
        total_owed = loan.amount + interest

        loan.repaid += amount
        if loan.repaid >= total_owed:
            loan.status = LoanStatus.REPAID
            print(f"[贷款还款] #{loan_id}: 已还清 (${total_owed:,})")
        else:
            print(f"[贷款还款] #{loan_id}: 部分还款 ${amount:,} (剩余 ${total_owed - loan.repaid:,})")

        return True

    def liquidate_loan(self, loan_id: int, liquidator: str) -> bool:
        if loan_id not in self.loans:
            raise ValueError(f"贷款 #{loan_id} 不存在")

        loan = self.loans[loan_id]
        if loan.status != LoanStatus.ACTIVE:
            raise ValueError(f"贷款 #{loan_id} 不是 ACTIVE 状态")
        if int(time.time()) < loan.end_time:
            raise ValueError(f"贷款 #{loan_id} 未到期")

        loan.status = LoanStatus.LIQUIDATED
        print(f"[清算] #{loan_id}: 抵押品 (${loan.collateral_value:,}) 被 {liquidator[:8]} 清算")

        return True

    def _calculate_rate(self, pool_id: int) -> float:
        pool = self.pools.get(pool_id)
        if not pool:
            return 0.05  # 默认5%

        utilization = pool.utilization_rate
        if utilization < 0.5:
            return pool.base_rate + (utilization * 0.05)
        else:
            return pool.base_rate + 0.025 + (utilization - 0.5) * 0.2

    def _calculate_interest(self, loan: FilmLoan) -> int:
        if loan.start_time == 0:
            return 0
        elapsed = int(time.time()) - loan.start_time
        return int(loan.amount * loan.interest_rate * elapsed / 365 / 86400)

    def get_project_details(self, project_id: int) -> Dict:
        project = self.projects[project_id]
        project_loans = [l for l in self.loans.values() if l.project_id == project_id]

        return {
            "project_id": project_id,
            "title": project.title,
            "creator": project.creator[:8],
            "budget": project.budget,
            "raised": project.raised,
            "funding_gap": project.budget - project.raised,
            "funding_percentage": (project.raised / project.budget * 100) if project.budget > 0 else 0,
            "status": project.status.value,
            "active_loans": len([l for l in project_loans if l.status == LoanStatus.ACTIVE]),
            "total_interest": sum(self._calculate_interest(l) for l in project_loans)
        }

    def simulate_film_financing(self) -> Dict:
        """
        模拟电影DeFi融资全流程
        """
        print(f"\n{'='*60}")
        print(f"  DeFi电影融资模拟：从银行信贷到链上借贷池")
        print(f"{'='*60}\n")

        # 1. 创建借贷池
        print(">>> 1. 创建DeFi借贷池\n")
        pool1 = self.create_lending_pool("Film Production Pool Alpha", 0.04)
        pool2 = self.create_lending_pool("Independent Film Pool Beta", 0.06)

        # 存款
        self.deposit(pool1, "0xInstitution...Fund", 5000000)
        self.deposit(pool1, "0xRetail...Investor", 1000000)
        self.deposit(pool2, "0xDAO...FilmGuild", 3000000)

        # 2. 创建电影项目
        print("\n>>> 2. 创建电影项目\n")
        project1 = self.create_film_project(
            creator="0xDirector...Wong",
            title="《链上蒙太奇》",
            budget=2500000
        )

        project2 = self.create_film_project(
            creator="0xProducer...Li",
            title="《Token化叙事》",
            budget=5000000
        )

        # 3. 申请贷款
        print("\n>>> 3. 申请链上贷款\n")
        loan1 = self.request_loan(
            project_id=project1,
            borrower="0xDirector...Wong",
            amount=1500000,
            duration=180 * 86400,
            collateral_type=CollateralType.NFT_IP,
            collateral_value=3000000
        )

        loan2 = self.request_loan(
            project_id=project2,
            borrower="0xProducer...Li",
            amount=3000000,
            duration=270 * 86400,
            collateral_type=CollateralType.DISTRIBUTION,
            collateral_value=7500000
        )

        # 4. 发放贷款
        print("\n>>> 4. 发放贷款\n")
        self.fund_loan(loan1, pool1)
        self.fund_loan(loan2, pool2)

        # 5. 查看项目状态
        print("\n>>> 5. 项目融资状态\n")
        for pid in [project1, project2]:
            details = self.get_project_details(pid)
            print(f"  {details['title']}:")
            print(f"    融资进度: ${details['raised']:,}/{details['budget']:,} ({details['funding_percentage']:.1f}%)")
            print(f"    活跃贷款: {details['active_loans']} 笔")

        # 6. 模拟还款
        print("\n>>> 6. 模拟还款\n")
        self.repay_loan(loan1, 1650000)

        # 7. 对比传统融资
        print("\n>>> 7. 传统融资 vs DeFi融资对比\n")
        print(f"  {'指标':<20} {'传统银行信贷':<20} {'DeFi借贷池':<20}")
        print(f"  {'-'*20} {'-'*20} {'-'*20}")
        print(f"  {'审批时间':<20} {'2-6个月':<20} {'5-15分钟':<20}")
        print(f"  {'年化利率':<20} {'8-15%':<20} {'4-12%':<20}")
        print(f"  {'抵押要求':<20} {'预售合同+完片担保':<20} {'NFT IP超额抵押':<20}")
        print(f"  {'信用审核':<20} {'银行信用评级':<20} {'智能合约自动审核':<20}")
        print(f"  {'全球流动性':<20} {'仅限本地银行':<20} {'全球流动性池':<20}")
        print(f"  {'最小金额':<20} {'$500,000':<20} {'$100':<20}")

        print(f"\n{'='*60}")
        print(f"  模拟完成")
        print(f"{'='*60}")

        return {
            "projects_created": 2,
            "loans_issued": 2,
            "total_funded": 4500000,
            "pool1_utilization": self.pools[pool1].utilization_rate,
            "pool2_utilization": self.pools[pool2].utilization_rate
        }


def main():
    platform = FilmDeFiPlatform()
    result = platform.simulate_film_financing()

    print(f"\n=== 模拟结果 ===")
    print(f"项目数: {result['projects_created']}")
    print(f"贷款数: {result['loans_issued']}")
    print(f"总融资: ${result['total_funded']:,}")


if __name__ == "__main__":
    main()