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contracts...BrewSmartContract.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/proxy/Clones.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";

contract BrewSmartContractTest {
    BrewBank public brew_bank;
    address public account_address;
    
    function CreateBrewBank() public {
        brew_bank = new BrewBank(300, 0x5B38Da6a701c568545dCfcB03FcB875f56beddC4);
        
        address investable_implementation_address = address(new CurveAaveDaiInvestableAccount());
        
        InvestmentManager investment_manager = InvestmentManager(brew_bank.GetInvestmentManagerAddress());
        investment_manager.AddInvestmentStrategy("CURVE_AAVE_STABLE_SWAP", investable_implementation_address);
    }
    
    function CreateAccount () public {
        account_address = brew_bank.CreateAccount(address(this), "CURVE_AAVE_STABLE_SWAP");
        Investable account = Investable(account_address);
        
        account.Deposit(20);
        account.Withdraw(10);
    }
}

interface AccountFactory {
   function CreateAccount(address account_template_address) external returns (address);
}

interface AccountManager {
   function CreateAccount(address beneficiary_address, uint256 comission_rate_bps, address investment_manager_address, address account_template_address) external returns (address);
}

interface InvestmentManager {
    function AddInvestmentStrategy(string memory strategy_name, address investable_implementation_contract) external;
    function GetInvestmentStrategy(string memory strategy_name) external view returns (address);
}

interface Investable {
    function Deposit(uint256 amount) external;
    function Withdraw(uint256 amount) external;
}

interface StableSwapAave {
    function add_liquidity(uint[3] calldata _amounts,uint _min_mint_amount, bool _use_underlying) external returns (uint);
    function remove_liquidity_one_coin(uint _token_amount, int128 _i, uint _min_amount, bool _use_underlying) external returns (uint);
}

contract BrewBank is Ownable {
    uint256 public comission_rate_bps;
    address public comission_address;
    address public account_manager_address;
    address public investment_manager_address;
    
    constructor (uint256 _comission_rate_bps, address _comission_address) {
        comission_rate_bps = _comission_rate_bps;
        comission_address = _comission_address;
        
        address account_factory_address = address(new BrewAccountFactory());
        account_manager_address = address(new BrewAccountManager(account_factory_address));
        BrewAccountFactory(account_factory_address).transferOwnership(account_manager_address);
        
        investment_manager_address = address(new BrewInvestmentManager());
        BrewInvestmentManager(investment_manager_address).transferOwnership(owner());
    }
    
    function CreateAccount(address beneficiary_address, string memory investment_strategy_name) public onlyOwner returns (address) {
        address account_template_address = InvestmentManager(investment_manager_address).GetInvestmentStrategy(investment_strategy_name);
        
        address account_address = AccountManager(account_manager_address).CreateAccount(beneficiary_address, comission_rate_bps, comission_address, account_template_address);
        
        return account_address;
    }
    
    function GetAccountManagerAddress() public view returns (address)  {
        return account_manager_address;
    }
    
    function GetInvestmentManagerAddress() public view returns (address)  {
        return investment_manager_address;
    }
}

contract BrewAccountManager is AccountManager, Ownable {
    address public account_factory_address;
    mapping(address => address) beneficiary_account_address_map;
    
    constructor (address _account_factory_address) {
        account_factory_address = _account_factory_address;
    }
    
    function CreateAccount(address beneficiary_address, uint256 comission_rate_bps, address comission_address, address account_template_address) public onlyOwner returns (address) {
        address account_address = AccountFactory(account_factory_address).CreateAccount(account_template_address);
        
        ComissionableAccount account = ComissionableAccount(account_address);
        account.Initialize(comission_rate_bps, comission_address, address(this));
        account.transferOwnership(beneficiary_address);
        
        beneficiary_account_address_map[beneficiary_address] = account_address;
        
        return account_address;
    }
    
    function GetAccount(address beneficiary_address) public view returns (address) {
        address account_address = beneficiary_account_address_map[beneficiary_address];
        require(account_address != address(0), "This beneficiary_address does not exist.");
        
        return account_address;
    }
}

contract BrewAccountFactory is AccountFactory, Ownable {
    using Clones for address;
    
    function CreateAccount(address account_template_address) public onlyOwner returns (address) {
        require(account_template_address != address(0), "account_template must be set");
        address account_address = account_template_address.clone();
        
        return account_address; 
    }
}

contract BrewInvestmentManager is InvestmentManager, Ownable {
    mapping(string => address) public investment_strategies;
    
    // New investment strategies can be added at runtime, but older ones can not be edited.
    function AddInvestmentStrategy(string memory strategy_name, address investable_implementation_contract) public onlyOwner {
        require(investment_strategies[strategy_name] == address(0), "This investment strategy name is already added");
        
        investment_strategies[strategy_name] = investable_implementation_contract;
    }
    
    function GetInvestmentStrategy(string memory strategy_name) public view returns (address) {
        address investable_implementation_address = investment_strategies[strategy_name];
        require(investable_implementation_address != address(0), "This investment strategy name does not exist");
        
        return investable_implementation_address;
    }
}

contract ComissionableAccount is Initializable, OwnableUpgradeable {
    uint256 public comission_rate_bps;
    address public comission_address;
    address public account_manager_address;
    
    function Initialize(uint256 _comission_rate_bps, address _comission_address, address _account_manager_address) public initializer {
        comission_rate_bps = _comission_rate_bps;
        comission_address = _comission_address;
        account_manager_address = _account_manager_address;
        __Ownable_init();
    }
    
    function CalculateComission(uint256 amount) internal view returns (uint256){
        return (amount * comission_rate_bps)/10000;
    }
}

contract CurveAaveDaiInvestableAccount is Investable, ComissionableAccount {
    address public DAI_ADDRESS = 0x8f3Cf7ad23Cd3CaDbD9735AFf958023239c6A063;
    address public CURVE_AAVE_LP_TOKEN_ADDRESS = 0xE7a24EF0C5e95Ffb0f6684b813A78F2a3AD7D171;
    address public CURVE_AAVE_STABLE_SWAP_SMART_CONTRACT_ADDRESS = 0x445FE580eF8d70FF569aB36e80c647af338db351;
    
    uint256 public principal_amount;
    
    function Deposit(uint256 amount) public onlyOwner {
        // Transfer the amount from the owner who has already approved this transfer.
        ERC20Utils.ApprovedTransfer(amount, DAI_ADDRESS, owner());
        
        // Approve the allowance of the curve aave smart contract.
        ERC20Utils.Approve(amount, DAI_ADDRESS, CURVE_AAVE_LP_TOKEN_ADDRESS);
        
        StableSwapAave(CURVE_AAVE_STABLE_SWAP_SMART_CONTRACT_ADDRESS).add_liquidity([amount, 0, 0], 0, false);
        
        principal_amount = principal_amount + amount;
    }
    
    function Withdraw(uint256 lp_token_amount) public onlyOwner {
        require(ERC20Utils.HasBalance(lp_token_amount, CURVE_AAVE_LP_TOKEN_ADDRESS));
        
        StableSwapAave(CURVE_AAVE_STABLE_SWAP_SMART_CONTRACT_ADDRESS).remove_liquidity_one_coin(lp_token_amount, 0, 0, false);
        uint256 withdrawn_amount = ERC20Utils.GetBalance(DAI_ADDRESS);

        // Charge comission only if the withdrawn amount exceeds the principal amount.
        if (withdrawn_amount <= principal_amount) {
            TransferWithoutComission(withdrawn_amount);
                
            // Reduce the principal amount by the withdran amount.
            principal_amount = principal_amount - withdrawn_amount;
        } else {
            uint256 excess_amount = withdrawn_amount - principal_amount;
            uint256 comission_amount = CalculateComission(excess_amount);
                
            TransferWithComission(withdrawn_amount, comission_amount);

            principal_amount = 0;
        }
    }
    
    function TransferWithComission(uint256 total_amount, uint256 comission_amount) internal {
        ERC20Utils.Transfer(comission_amount, DAI_ADDRESS, comission_address);
        ERC20Utils.Transfer(total_amount - comission_amount, DAI_ADDRESS, owner());
    }
    
    function TransferWithoutComission(uint256 total_amount) internal {
        ERC20Utils.Transfer(total_amount, DAI_ADDRESS, owner());
    }
}

library ERC20Utils {
    function Approve(uint256 amount, address token_address, address spender) internal {
        IERC20(token_address).approve(spender, amount);
    }
    
    function ApprovedTransfer(uint256 amount, address token_address, address sender) internal {
        IERC20(token_address).transferFrom(sender, address(this), amount);
    }
    
    function Transfer(uint256 amount, address token_address, address recipient) internal {
        IERC20(token_address).transfer(recipient, amount);
    }
    
    function GetBalance(address token_address) internal view returns (uint256) {
        return IERC20(token_address).balanceOf(address(this));
    } 
    
    function HasBalance(uint256 amount, address token_address) internal view returns (bool) {
        return IERC20(token_address).balanceOf(address(this)) >= amount;
    } 
}