//ChainPaint is a gamified art project fully hosted on-chain, where participants use ERC20 $PXL tokens to collectively paint a live ERC721 canvas to create a unique piece of bitmap art - saved permanently to the blockchain.

//TG: t.me/ChainPaint
//X: twitter.com/ChainPaint

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.23;

import "./IUniswapV2Router02.sol";
import "./IUniswapV2Factory.sol";
import "./PoolCreatableErc741.sol";
import "../lib/Ownable.sol";

contract ChainPaint741 is PoolCreatableErc741, Ownable {
    uint256 constant _startTotalSupply = 100000 * (10 ** _decimals);
    uint256 constant _startMaxBuyCount = (_startTotalSupply * 5) / 10000;
    uint256 constant _addMaxBuyPercentPerSec = 1; // 100%=_addMaxBuyPrecesion add 0.005%/second
    uint256 constant _addMaxBuyPrecesion = 10000;
    uint256 _taxBuy = 250;
    uint256 _taxSell = 250;
    uint256 constant _taxPrecesion = 1000;
    uint256 constant _transferZeroTaxSeconds = 1000; // zero tax transfer time
    address _deployer;
    address immutable _withdrawer;
    address public immutable rewardPool;
    uint256 public devShare = 50;
    uint256 public devSharePrecision = 100;
    uint256 public devShareMax = 50;

    constructor(
        address rewardPool_,
        address routerAddress
    ) PoolCreatableErc741("ChainPaint", "PXL", routerAddress) {
        _deployer = msg.sender;
        _withdrawer = msg.sender;
        rewardPool = rewardPool_;
    }

    modifier maxBuyLimit(uint256 amount) {
        require(amount <= maxBuy(), "max buy limit");
        _;
    }

    receive() external payable {
        uint256 devFee = (msg.value * devShare) / devSharePrecision;
        bool sent;
        if (devFee > 0) {
            (sent, ) = payable(_withdrawer).call{value: devFee}("");
            require(sent, "sent fee error: dev ether is not sent");
        }
        (sent, ) = payable(rewardPool).call{value: msg.value - devFee}("");
        require(sent, "sent fee error: rewardPool ether is not sent");
    }

    function setTax(uint256 taxBuy, uint256 taxSell) external onlyOwner {
        require(taxBuy < 250);
        require(taxSell < 250);
        _taxBuy = taxBuy;
        _taxSell = taxSell;
    }

    function setDevShare(uint256 newDevShare) external onlyOwner {
        require(newDevShare <= devShareMax);
        devShare = newDevShare;
    }

    function createPairCount() internal pure override returns (uint256) {
        return _startTotalSupply;
    }

    function maxBuy() public view returns (uint256) {
        if (!isStarted()) return _startTotalSupply;
        uint256 count = _startMaxBuyCount +
            (_startTotalSupply *
                (block.timestamp - _startTime) *
                _addMaxBuyPercentPerSec) /
            _addMaxBuyPrecesion;
        if (count > _startTotalSupply) count = _startTotalSupply;
        return count;
    }

    function transferTax() public view returns (uint256) {
        if (!isStarted()) return 0;
        uint256 deltaTime = block.timestamp - _startTime;
        if (deltaTime >= _transferZeroTaxSeconds) return 0;
        return
            (_taxPrecesion * (_transferZeroTaxSeconds - deltaTime)) /
            _transferZeroTaxSeconds;
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal override {
        // allow burning
        if (to == address(0)) {
            _burn(from, amount);
            return;
        }

        // system transfers
        if (
            from == address(0) ||
            from == address(this) ||
            from == _deployer ||
            to == _deployer
        ) {
            super._transfer(from, to, amount);
            return;
        }

        // transfers with fee
        if (_feeLocked) {
            super._transfer(from, to, amount);
            return;
        } else {
            if (from == _pair) {
                buy(to, amount);
                return;
            } else if (to == _pair) {
                sell(from, amount);
                return;
            } else transferFithFee(from, to, amount);
        }
    }

    function buy(
        address to,
        uint256 amount
    ) private maxBuyLimit(amount) lockFee {
        uint256 tax = (amount * _taxBuy) / _taxPrecesion;
        if (tax > 0) super._transfer(_pair, address(this), tax);
        super._transfer(_pair, to, amount - tax);
    }

    function sell(address from, uint256 amount) private lockFee {
        _sellTokens();
        uint256 tax = (amount * _taxBuy) / _taxPrecesion;
        if (tax > 0) super._transfer(from, address(this), tax);
        super._transfer(from, _pair, amount - tax);
    }

    function _sellTokens() private {
        uint256 sellCount = balanceOf(address(this));
        uint256 maxSwapCount = sellCount * 2;
        if (sellCount > maxSwapCount) sellCount = maxSwapCount;
        _sellTokens(sellCount, address(this));
    }

    function transferFithFee(
        address from,
        address to,
        uint256 amount
    ) private lockFee {
        uint256 tax = (amount * transferTax()) / _taxPrecesion;
        if (tax > 0) _burn(from, tax);
        super._transfer(from, to, amount - tax);
    }

    function burnCount() public view returns (uint256) {
        return _startTotalSupply - totalSupply();
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

pragma solidity ^0.8.23;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "@openzeppelin/contracts/utils/Context.sol";

contract ERC741 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) internal _balances;

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

    uint256 internal _totalSupply;
    uint8 internal constant _decimals = 9;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public pure returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(
        address account
    ) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(
        address owner,
        address spender
    ) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(
        address spender,
        uint256 amount
    ) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(
        address spender,
        uint256 addedValue
    ) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(
        address spender,
        uint256 subtractedValue
    ) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(
            currentAllowance >= subtractedValue,
            "ERC20: decreased allowance below zero"
        );
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");

        uint256 fromBalance = _balances[from];
        require(
            fromBalance >= amount,
            "ERC20: transfer amount exceeds balance"
        );
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Erases `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        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);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(
                currentAllowance >= amount,
                "ERC20: insufficient allowance"
            );
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.23;

interface IUniswapV2Factory {
    function createPair(address tokenA, address tokenB)
        external
        returns (address pair);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.23;

interface IUniswapV2Router02 {
    function swapExactTokensForETH(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function swapETHForExactTokens(
        uint256 amountOut,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable returns (uint256[] memory amounts);

    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (uint256 amountToken, uint256 amountETH, uint256 liquidity);

    function swapExactETHForTokens(
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external payable returns (uint[] memory amounts);

    function getReserves(
        address factory,
        address tokenA,
        address tokenB
    ) external view returns (uint reserveA, uint reserveB);

    function getAmountsIn(
        uint amountOut,
        address[] memory path
    ) external view returns (uint[] memory amounts);

    function getAmountsOut(
        uint amountIn,
        address[] memory path
    ) external view returns (uint[] memory amounts);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.23;

contract Ownable {
    address _owner;

    event RenounceOwnership();

    constructor() {
        _owner = msg.sender;
    }

    modifier onlyOwner() {
        require(_owner == msg.sender, "only owner");
        _;
    }

    function owner() external view virtual returns (address) {
        return _owner;
    }

    function ownerRenounce() public onlyOwner {
        _owner = address(0);
        emit RenounceOwnership();
    }

    function transferOwnership(address newOwner) external onlyOwner {
        _owner = newOwner;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.23;

import "./ERC741.sol";
import "./IUniswapV2Router02.sol";
import "./IUniswapV2Factory.sol";
import "../lib/Ownable.sol";

abstract contract PoolCreatableErc741 is ERC741 {
    IUniswapV2Router02 immutable uniswapV2Router;
    address internal _pair;
    uint256 internal _startTime;
    bool internal _feeLocked;

    constructor(
        string memory name_,
        string memory symbol_,
        address routerAddress
    ) ERC741(name_, symbol_) {
        uniswapV2Router = IUniswapV2Router02(routerAddress);
    }

    modifier lockFee() {
        _feeLocked = true;
        _;
        _feeLocked = false;
    }

    function createPair() external payable {
        _pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(
            address(this),
            uniswapV2Router.WETH()
        );
        _mint(address(this), createPairCount());
        _approve(address(this), address(uniswapV2Router), type(uint256).max);
        uniswapV2Router.addLiquidityETH{value: msg.value}(
            address(this),
            createPairCount(),
            0,
            0,
            msg.sender,
            block.timestamp
        );
        _startTime = block.timestamp;
    }

    function isStarted() internal view returns (bool) {
        return _pair != address(0);
    }

    function createPairCount() internal pure virtual returns (uint256);

    function _sellTokens(uint256 tokenAmount, address to) internal lockFee {
        if (tokenAmount == 0) return;
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();

        // make the swap
        uniswapV2Router.swapExactTokensForETH(
            tokenAmount,
            0, // accept any amount of ETH
            path,
            to,
            block.timestamp
        );
    }
}

{
  "compilationTarget": {
    "contracts/token/ChainPaint741.sol": "ChainPaint741"
  },
  "evmVersion": "paris",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": []
}