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

// Fun Simple ERC20 Token --> visit https://www.base.fun/ for full experience
// Powered by DX --> https://www.dx.app/

interface IERC20 {
    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function transfer(
        address recipient,
        uint256 amount
    ) external returns (bool);
    function approve(address spender, uint256 amount) external returns (bool);
    function allowance(
        address owner,
        address spender
    ) external returns (uint256);
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);
    function decimals() external returns (uint8);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 value
    );
}

contract SimpleERC20 is IERC20 {
    string public name;
    string public symbol;
    uint8 public constant decimals = 18;
    uint8 public constant version = 2;

    address public initialFrom;
    address public deployerFrom;
    bool public isInitialized;
    bool public dexInitiated;

    uint256 private _totalSupply;
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;

    function initialize(
        uint256 initialSupply,
        string memory _name,
        string memory _symbol,
        address _midDeployer,
        address _deployer
    ) external {
        require(!isInitialized);
        _mint(_midDeployer, initialSupply);
        initialFrom = _midDeployer;
        deployerFrom = _deployer;
        name = _name;
        symbol = _symbol;
        isInitialized = true;
    }

    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    function transfer(
        address recipient,
        uint256 amount
    ) public override returns (bool) {
        require(_validateTransfer(msg.sender), "not dex listed");

        _transfer(msg.sender, recipient, amount);
        return true;
    }

    function approve(
        address spender,
        uint256 amount
    ) public override returns (bool) {
        _approve(msg.sender, spender, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public override returns (bool) {
        require(_validateTransfer(msg.sender), "not dex listed");
        _transfer(sender, recipient, amount);
        _approve(sender, msg.sender, _allowances[sender][msg.sender] - amount);
        return true;
    }
    function Burn(uint256 amount) public returns (bool) {
        _burn(msg.sender, amount);
        return true;
    }

    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        require(amount > 0, "invalid transfer amount");

        _balances[sender] -= amount;
        _balances[recipient] += amount;
        emit Transfer(sender, recipient, amount);
    }

    function _mint(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: mint to the zero address");

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);
    }

    function _approve(address owner, address spender, uint256 amount) internal {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    function _validateTransfer(address _from) internal view returns (bool) {
        if (dexInitiated) {
            return true;
        }
        if (_from == initialFrom || _from == deployerFrom) {
            return true;
        }
        return false;
    }

    function allowance(
        address owner,
        address spender
    ) public view returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev Increase the amount of tokens that an owner allowed to a spender.
     * approve should be called when allowed_[_spender] == 0. To increment
     * allowed value is better to use this function to avoid 2 calls (and wait until
     * the first transaction is mined)
     * From MonolithDAO Token.sol
     * @param spender The address which will spend the funds.
     * @param addedValue The amount of tokens to increase the allowance by.
     */
    function increaseAllowance(
        address spender,
        uint256 addedValue
    ) public returns (bool) {
        require(spender != address(0));

        _allowances[msg.sender][spender] = (_allowances[msg.sender][spender] +
            addedValue);
        emit Approval(msg.sender, spender, _allowances[msg.sender][spender]);
        return true;
    }

    /**
     * @dev Decrease the amount of tokens that an owner allowed to a spender.
     * approve should be called when allowed_[_spender] == 0. To decrement
     * allowed value is better to use this function to avoid 2 calls (and wait until
     * the first transaction is mined)
     * From MonolithDAO Token.sol
     * @param spender The address which will spend the funds.
     * @param subtractedValue The amount of tokens to decrease the allowance by.
     */
    function decreaseAllowance(
        address spender,
        uint256 subtractedValue
    ) public returns (bool) {
        require(spender != address(0));

        _allowances[msg.sender][spender] = (_allowances[msg.sender][spender] -
            subtractedValue);
        emit Approval(msg.sender, spender, _allowances[msg.sender][spender]);
        return true;
    }
    /**
     * @dev Internal function that burns an amount of the token of a given
     * account.
     * @param account The account whose tokens will be burnt.
     * @param amount The amount that will be burnt.
     */
    function _burn(address account, uint256 amount) internal {
        require(account != address(0));
        require(amount <= _balances[account]);

        _totalSupply = _totalSupply - amount;
        _balances[account] = _balances[account] - amount;
        emit Transfer(account, address(0), amount);
    }

    function initiateDex() public {
        require(msg.sender == initialFrom, "only fun allowed");
        dexInitiated = true;
    }
}

{
  "viaIR": true,
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "remappings": [
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/"
  ]
}

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