script.py

# First, let's create the main directory structure and core smart contracts

import os
import json

# Create a comprehensive smart contract for the USB Stablecoin
usb_contract = '''// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/ERC20BurnableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/access/AccessControlUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/security/ReentrancyGuardUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import "@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol";

/**
 * @title USB Stablecoin
 * @dev Stablecoin token with minting/burning capabilities based on delta neutral strategies
 * @author Stabolut Protocol
 */
contract USBStablecoin is 
    Initializable,
    ERC20Upgradeable,
    ERC20BurnableUpgradeable,
    PausableUpgradeable,
    AccessControlUpgradeable,
    ReentrancyGuardUpgradeable,
    UUPSUpgradeable 
{
    bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
    bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE");
    bytes32 public constant UPGRADER_ROLE = keccak256("UPGRADER_ROLE");
    
    /// @notice Emergency circuit breaker threshold (in basis points)
    uint256 public constant CIRCUIT_BREAKER_THRESHOLD = 1000; // 10%
    
    /// @notice Maximum supply cap
    uint256 public maxSupply;
    
    /// @notice Stabolut Engine contract address
    address public stabolutEngine;
    
    /// @notice Last block number when minting occurred
    uint256 public lastMintBlock;
    
    /// @notice Minting rate limit per block
    uint256 public mintingRateLimit;
    
    /// @notice Total minted in current block
    uint256 public currentBlockMinted;
    
    event MaxSupplyUpdated(uint256 newMaxSupply);
    event MintingRateLimitUpdated(uint256 newRateLimit);
    event StabolutEngineUpdated(address newEngine);
    event CircuitBreakerTriggered(uint256 amount, uint256 threshold);
    
    /// @custom:oz-upgrades-unsafe-allow constructor
    constructor() {
        _disableInitializers();
    }
    
    function initialize(
        string memory name,
        string memory symbol,
        uint256 _maxSupply,
        uint256 _mintingRateLimit,
        address _stabolutEngine
    ) public initializer {
        __ERC20_init(name, symbol);
        __ERC20Burnable_init();
        __Pausable_init();
        __AccessControl_init();
        __ReentrancyGuard_init();
        __UUPSUpgradeable_init();
        
        _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
        _grantRole(MINTER_ROLE, msg.sender);
        _grantRole(PAUSER_ROLE, msg.sender);
        _grantRole(UPGRADER_ROLE, msg.sender);
        
        maxSupply = _maxSupply;
        mintingRateLimit = _mintingRateLimit;
        stabolutEngine = _stabolutEngine;
        
        // Grant minter role to Stabolut Engine
        _grantRole(MINTER_ROLE, _stabolutEngine);
    }
    
    /**
     * @dev Mint new USB tokens with rate limiting and circuit breaker
     * @param to Address to mint tokens to
     * @param amount Amount of tokens to mint
     */
    function mint(address to, uint256 amount) 
        external 
        onlyRole(MINTER_ROLE) 
        whenNotPaused 
        nonReentrant 
    {
        require(to != address(0), "USB: mint to zero address");
        require(amount > 0, "USB: amount must be positive");
        require(totalSupply() + amount <= maxSupply, "USB: exceeds max supply");
        
        // Rate limiting check
        if (block.number != lastMintBlock) {
            lastMintBlock = block.number;
            currentBlockMinted = 0;
        }
        
        require(
            currentBlockMinted + amount <= mintingRateLimit,
            "USB: exceeds minting rate limit"
        );
        
        // Circuit breaker check
        uint256 supplyIncreasePercentage = (amount * 10000) / totalSupply();
        if (supplyIncreasePercentage > CIRCUIT_BREAKER_THRESHOLD) {
            emit CircuitBreakerTriggered(amount, CIRCUIT_BREAKER_THRESHOLD);
            revert("USB: circuit breaker triggered");
        }
        
        currentBlockMinted += amount;
        _mint(to, amount);
    }
    
    /**
     * @dev Burn tokens when user withdraws from delta neutral strategy
     * @param from Address to burn tokens from
     * @param amount Amount of tokens to burn
     */
    function burnFrom(address from, uint256 amount) 
        public 
        override 
        onlyRole(MINTER_ROLE) 
        whenNotPaused 
    {
        require(from != address(0), "USB: burn from zero address");
        require(amount > 0, "USB: amount must be positive");
        require(balanceOf(from) >= amount, "USB: insufficient balance");
        
        _burn(from, amount);
    }
    
    /**
     * @dev Set maximum supply
     * @param _maxSupply New maximum supply
     */
    function setMaxSupply(uint256 _maxSupply) external onlyRole(DEFAULT_ADMIN_ROLE) {
        require(_maxSupply >= totalSupply(), "USB: max supply too low");
        maxSupply = _maxSupply;
        emit MaxSupplyUpdated(_maxSupply);
    }
    
    /**
     * @dev Set minting rate limit
     * @param _mintingRateLimit New minting rate limit per block
     */
    function setMintingRateLimit(uint256 _mintingRateLimit) external onlyRole(DEFAULT_ADMIN_ROLE) {
        mintingRateLimit = _mintingRateLimit;
        emit MintingRateLimitUpdated(_mintingRateLimit);
    }
    
    /**
     * @dev Update Stabolut Engine address
     * @param _stabolutEngine New engine address
     */
    function setStabolutEngine(address _stabolutEngine) external onlyRole(DEFAULT_ADMIN_ROLE) {
        require(_stabolutEngine != address(0), "USB: invalid engine address");
        
        // Revoke role from old engine
        if (stabolutEngine != address(0)) {
            _revokeRole(MINTER_ROLE, stabolutEngine);
        }
        
        stabolutEngine = _stabolutEngine;
        _grantRole(MINTER_ROLE, _stabolutEngine);
        
        emit StabolutEngineUpdated(_stabolutEngine);
    }
    
    /**
     * @dev Pause contract
     */
    function pause() external onlyRole(PAUSER_ROLE) {
        _pause();
    }
    
    /**
     * @dev Unpause contract
     */
    function unpause() external onlyRole(PAUSER_ROLE) {
        _unpause();
    }
    
    /**
     * @dev Override _beforeTokenTransfer to add pausable functionality
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal override whenNotPaused {
        super._beforeTokenTransfer(from, to, amount);
    }
    
    /**
     * @dev Override _authorizeUpgrade for UUPS upgradeable pattern
     */
    function _authorizeUpgrade(address newImplementation) 
        internal 
        override 
        onlyRole(UPGRADER_ROLE) 
    {}
    
    /**
     * @dev Returns the number of decimals used to get its user representation
     */
    function decimals() public pure override returns (uint8) {
        return 18;
    }
}'''

# Save the USB contract
with open('USBStablecoin.sol', 'w') as f:
    f.write(usb_contract)

print("✅ USB Stablecoin contract created successfully")
print("📄 Contract features:")
print("  - ERC20 compliant with burning capability")
print("  - Upgradeable using UUPS pattern")
print("  - Access control with roles")
print("  - Pausable for emergencies")
print("  - Rate limiting and circuit breaker")
print("  - Reentrancy protection")
print("  - Max supply cap")