// /$$$$$$$  /$$$$$$ /$$   /$$  /$$$$$$        /$$$$$$$$  /$$$$$$   /$$$$$$   /$$$$$$  /$$     /$$ /$$$$$$  /$$$$$$$$ /$$$$$$$$ /$$      /$$
//| $$__  $$|_  $$_/| $$  /$$/ /$$__  $$      | $$_____/ /$$__  $$ /$$__  $$ /$$__  $$|  $$   /$$//$$__  $$|__  $$__/| $$_____/| $$$    /$$$
//| $$  \ $$  | $$  | $$ /$$/ | $$  \ $$      | $$      | $$  \__/| $$  \ $$| $$  \__/ \  $$ /$$/| $$  \__/   | $$   | $$      | $$$$  /$$$$
//| $$$$$$$/  | $$  | $$$$$/  | $$$$$$$$      | $$$$$   | $$      | $$  | $$|  $$$$$$   \  $$$$/ |  $$$$$$    | $$   | $$$$$   | $$ $$/$$ $$
//| $$____/   | $$  | $$  $$  | $$__  $$      | $$__/   | $$      | $$  | $$ \____  $$   \  $$/   \____  $$   | $$   | $$__/   | $$  $$$| $$
//| $$        | $$  | $$\  $$ | $$  | $$      | $$      | $$    $$| $$  | $$ /$$  \ $$    | $$    /$$  \ $$   | $$   | $$      | $$\  $ | $$
//| $$       /$$$$$$| $$ \  $$| $$  | $$      | $$$$$$$$|  $$$$$$/|  $$$$$$/|  $$$$$$/    | $$   |  $$$$$$/   | $$   | $$$$$$$$| $$ \/  | $$
//|__/      |______/|__/  \__/|__/  |__/      |________/ \______/  \______/  \______/     |__/    \______/    |__/   |________/|__/     |__/
                                                                                                                                          
// website: https://pikacrypto.com


// SPDX-License-Identifier: MIT
pragma solidity 0.8.4;

interface IThunder {
    function totalSupply() external view returns (uint256);

    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 burn(uint256 value) external;
}

pragma solidity 0.8.4;

contract Owned {
    address public owner;
    address public proposedOwner;

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        owner = msg.sender;
        emit OwnershipTransferred(address(0), msg.sender);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() virtual {
        require(msg.sender == owner);
        _;
    }

    /**
     * @dev propeses a new owner
     * Can only be called by the current owner.
     */
    function proposeOwner(address payable _newOwner) external onlyOwner {
        proposedOwner = _newOwner;
    }

    /**
     * @dev claims ownership of the contract
     * Can only be called by the new proposed owner.
     */
    function claimOwnership() external {
        require(msg.sender == proposedOwner);
        emit OwnershipTransferred(owner, proposedOwner);
        owner = proposedOwner;
    }
}


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) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}



pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @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);
}



pragma solidity ^0.8.0;


/**
 * @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);
}




pragma solidity ^0.8.0;




/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The defaut value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * 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 value {ERC20} uses, unless this function is
     * 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 view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @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:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, 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}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), 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}.
     *
     * Requirements:
     *
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for ``sender``'s tokens of at least
     * `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;
    }

    /**
     * @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) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][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) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        _approve(_msgSender(), spender, currentAllowance - subtractedValue);

        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is 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:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `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");

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        _balances[sender] = senderBalance - amount;
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, 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:
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `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");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        _balances[account] = accountBalance - amount;
        _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 Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be to transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { }
}


pragma solidity 0.8.4;




struct Wallets {
    address team;
    address charity;
    address staking;
    address liquidity;
}

contract Rai is ERC20, Owned {
    IThunder thunder;
    Wallets public thunderWallets;
    address public beneficiary;
    bool public feesEnabled;
    mapping(address => bool) public isExcludedFromFee;

    event BeneficiaryUpdated(address oldBeneficiary, address newBeneficiary);
    event FeesEnabledUpdated(bool enabled);
    event ExcludedFromFeeUpdated(address account, bool excluded);
    event ThunderWalletsUpdated();
    event Evolved(uint256 amountThunder, uint256 amountRai);

    constructor(address _thunder, Wallets memory _thunderWallets) ERC20("RAI", "RAI") {
        thunder = IThunder(_thunder);
        thunderWallets = _thunderWallets;
        // premine for uniswap liquidity
        uint256 totalSupply = 41000 ether;
        feesEnabled = false;
        _mint(_msgSender(), totalSupply);
        isExcludedFromFee[msg.sender] = true;
        isExcludedFromFee[0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D] = true;
        beneficiary = msg.sender;
    }

    function evolve(uint256 _amountThunder) external {
        thunder.transferFrom(msg.sender, address(this), _amountThunder);
        uint256 amountRai = _amountThunder / 1000;

        uint256 burnedThunder = calculateFee(_amountThunder, 2000);
        thunder.burn(burnedThunder);

        uint256 lpRewards = calculateFee(_amountThunder, 100);
        uint256 charityTeamAmount = lpRewards / 2;
        thunder.transfer(thunderWallets.liquidity, lpRewards);
        thunder.transfer(thunderWallets.charity, charityTeamAmount);
        thunder.transfer(thunderWallets.team, charityTeamAmount);
        thunder.transfer(thunderWallets.staking, _amountThunder - burnedThunder - lpRewards - charityTeamAmount * 2);

        _mint(msg.sender, amountRai);
        emit Evolved(_amountThunder, amountRai);
    }

    /**
     * @dev if fees are enabled, subtract 2.25% fee and send it to beneficiary
     * @dev after a certain threshold, try to swap collected fees automatically
     * @dev if automatic swap fails (or beneficiary does not implement swapTokens function) transfer should still succeed
     */
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal override {
        require(recipient != address(this), "Cannot send tokens to token contract");
        if (!feesEnabled || isExcludedFromFee[sender] || isExcludedFromFee[recipient]) {
            ERC20._transfer(sender, recipient, amount);
            return;
        }
        uint256 burnedFee = calculateFee(amount, 25);
        _burn(sender, burnedFee);

        uint256 transferFee = calculateFee(amount, 200);
        ERC20._transfer(sender, beneficiary, transferFee);
        ERC20._transfer(sender, recipient, amount - transferFee - burnedFee);
    }

    function calculateFee(uint256 _amount, uint256 _fee) public pure returns (uint256) {
        return (_amount * _fee) / 10000;
    }

    /**
     * @notice allows to burn tokens from own balance
     * @dev only allows burning tokens until minimum supply is reached
     * @param value amount of tokens to burn
     */
    function burn(uint256 value) public {
        _burn(_msgSender(), value);
    }

    /**
     * @notice sets recipient of transfer fee
     * @dev only callable by owner
     * @param _newBeneficiary new beneficiary
     */
    function setBeneficiary(address _newBeneficiary) public onlyOwner {
        setExcludeFromFee(_newBeneficiary, true);
        emit BeneficiaryUpdated(beneficiary, _newBeneficiary);
        beneficiary = _newBeneficiary;
    }

    /**
     * @notice sets the wallets for the thunder tokens
     * @dev only callable by owner
     * @param _newWallets updated wallets
     */
    function setThunderWallets(Wallets memory _newWallets) public onlyOwner {
        emit ThunderWalletsUpdated();
        thunderWallets = _newWallets;
    }

    /**
     * @notice sets whether account collects fees on token transfer
     * @dev only callable by owner
     * @param _enabled bool whether fees are enabled
     */
    function setFeesEnabled(bool _enabled) public onlyOwner {
        emit FeesEnabledUpdated(_enabled);
        feesEnabled = _enabled;
    }

    /**
     * @notice adds or removes an account that is exempt from fee collection
     * @dev only callable by owner
     * @param _account account to modify
     * @param _excluded new value
     */
    function setExcludeFromFee(address _account, bool _excluded) public onlyOwner {
        isExcludedFromFee[_account] = _excluded;
        emit ExcludedFromFeeUpdated(_account, _excluded);
    }
}