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// SPDX-License-Identifier: UNLICENSED

pragma solidity 0.6.12;

import "SwapperSimpleBase.sol";
import "SwapPriceCalculatorInterface.sol";

contract Swapper
{
    using SafeMath for uint256;
    
    address private admin;
    IERC20 private token;
    ISwapPriceCalculator private priceCalculator;
    
    uint256 private ethReserve;
    uint256 private ethReserveTaken;
    uint256 private ethFee;
    uint256 private ethFeeTaken;
    uint256 private tokensSold;
    
    string private constant ERR_MSG_SENDER = "ERR_MSG_SENDER";
    string private constant ERR_AMOUNT = "ERR_AMOUNT";
    string private constant ERR_ZERO_ETH = "ERR_ZERO_ETH";
    
    event Swap(uint256 receivedEth,
               uint256 expectedTokens,
               uint16 slippage,
               uint256 ethFeeAdd,
               uint256 actualTokens,
               uint256 tokensSold);
    
    // constructor:
    //--------------------------------------------------------------------------------------------------------------------------
    constructor(address _admin, address _token, address _priceCalculator) public
    {
        admin = _admin;
        token = IERC20(_token);
        priceCalculator = ISwapPriceCalculator(_priceCalculator);
    }
    
    function getAdmin() external view returns (address)
    {
        return admin;
    }
    
    function getToken() external view returns (address)
    {
        return address(token);
    }
    //--------------------------------------------------------------------------------------------------------------------------
    
    // ETH balance methods:
    //--------------------------------------------------------------------------------------------------------------------------
    function getTotalEthBalance() external view returns (uint256)
    {
        return address(this).balance;
    }
    
    function sendEth(address payable _to) external returns (uint256 ethReserveTaken_, uint256 ethFeeTaken_)
    {
        require(msg.sender == admin, ERR_MSG_SENDER);
        
        _to.transfer(address(this).balance);
        
        ethReserveTaken_ = ethReserve - ethReserveTaken;
        ethFeeTaken_ = ethFee - ethFeeTaken;
        
        ethReserveTaken = ethReserve;
        ethFeeTaken = ethFee;
    }
    //--------------------------------------------------------------------------------------------------------------------------
    
    // Tokens balance methods:
    //--------------------------------------------------------------------------------------------------------------------------
    function getTotalTokensBalance() external view returns (uint256)
    {
        return token.balanceOf(address(this));
    }
    
    function sendTokens(address _to, uint256 _amount) external
    {
        require(msg.sender == admin, ERR_MSG_SENDER);
        
        if(_amount == 0)
        {
            token.transfer(_to, token.balanceOf(address(this)));
        }
        else
        {
            token.transfer(_to, _amount);
        }
    }
    //--------------------------------------------------------------------------------------------------------------------------
    
    // Price calculator:
    //--------------------------------------------------------------------------------------------------------------------------
    function getPriceCalculator() external view returns (address)
    {
        return address(priceCalculator);
    }
    
    function setPriceCalculator(address _priceCalculator) external
    {
        require(msg.sender == admin, ERR_MSG_SENDER);
        
        priceCalculator = ISwapPriceCalculator(_priceCalculator);
    }
    
    function calcPrice(uint256 _ethAmount, bool _excludeFee) external view returns (uint256, uint256, uint256)
    {
        require(_ethAmount > 0, ERR_ZERO_ETH);
        
        return priceCalculator.calc(_ethAmount, 0, 0, ethReserve, tokensSold, _excludeFee);
    }
    //--------------------------------------------------------------------------------------------------------------------------
    
    // Current state:
    //--------------------------------------------------------------------------------------------------------------------------
    function getState() external view returns (uint256 ethReserve_,
                                               uint256 ethReserveTaken_,
                                               uint256 ethFee_,
                                               uint256 ethFeeTaken_,
                                               uint256 tokensSold_)
    {
        ethReserve_ = ethReserve;
        ethReserveTaken_ = ethReserveTaken;
        ethFee_ = ethFee;
        ethFeeTaken_ = ethFeeTaken;
        tokensSold_ = tokensSold;
    }
    //--------------------------------------------------------------------------------------------------------------------------
    
    // Swap logic methods:
    //--------------------------------------------------------------------------------------------------------------------------
    function swap(uint256 _expectedTokensAmount, uint16 _slippage, bool _excludeFee) external payable
    {
        require(msg.value > 0, ERR_ZERO_ETH);
        require(_expectedTokensAmount > 0, "ERR_ZERO_EXP_AMOUNT");
        require(_slippage <= 500, "ERR_SLIPPAGE_TOO_BIG");
        
        (uint256 actualTokensAmount, uint256 ethFeeAdd, uint256 actualEthAmount)
            = priceCalculator.calc(msg.value, _expectedTokensAmount, _slippage, ethReserve, tokensSold, _excludeFee);
            
        require(actualTokensAmount > 0, "ERR_ZERO_ACTUAL_TOKENS");
        require(msg.value == actualEthAmount, "ERR_WRONG_ETH_AMOUNT");
        
        ethFee = ethFee.add(ethFeeAdd);
        ethReserve = ethReserve.add(msg.value.sub(ethFeeAdd));
        tokensSold = tokensSold.add(actualTokensAmount);
        
        token.transfer(msg.sender, actualTokensAmount);
     
        emit Swap(msg.value, _expectedTokensAmount, _slippage, ethFeeAdd, actualTokensAmount, tokensSold);
    }
    //--------------------------------------------------------------------------------------------------------------------------
}

// SPDX-License-Identifier: UNLICENSED

pragma solidity >=0.6.0 <0.8.0; // use 0.6.12 to compile this file

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

/**
 * @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);
}

// SPDX-License-Identifier: UNLICENSED

pragma solidity 0.6.12;

interface ISwapPriceCalculator
{
    function calc(uint256 receivedEthAmount,
                  uint256 expectedTokensAmount,
                  uint16  slippage,
                  uint256 ethReserve,
                  uint256 tokensSold,
                  bool 	  excludeFee) external view returns (uint256 actualTokensAmount,
															 uint256 ethFeeAdd,
															 uint256 actualEthAmount);
}

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[{"inputs":[{"internalType":"address","name":"_admin","type":"address"},{"internalType":"address","name":"_token","type":"address"},{"internalType":"address","name":"_priceCalculator","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"receivedEth","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"expectedTokens","type":"uint256"},{"indexed":false,"internalType":"uint16","name":"slippage","type":"uint16"},{"indexed":false,"internalType":"uint256","name":"ethFeeAdd","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"actualTokens","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"tokensSold","type":"uint256"}],"name":"Swap","type":"event"},{"inputs":[{"internalType":"uint256","name":"_ethAmount","type":"uint256"},{"internalType":"bool","name":"_excludeFee","type":"bool"}],"name":"calcPrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getAdmin","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getPriceCalculator","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getState","outputs":[{"internalType":"uint256","name":"ethReserve_","type":"uint256"},{"internalType":"uint256","name":"ethReserveTaken_","type":"uint256"},{"internalType":"uint256","name":"ethFee_","type":"uint256"},{"internalType":"uint256","name":"ethFeeTaken_","type":"uint256"},{"internalType":"uint256","name":"tokensSold_","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getToken","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getTotalEthBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getTotalTokensBalance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address payable","name":"_to","type":"address"}],"name":"sendEth","outputs":[{"internalType":"uint256","name":"ethReserveTaken_","type":"uint256"},{"internalType":"uint256","name":"ethFeeTaken_","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"sendTokens","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_priceCalculator","type":"address"}],"name":"setPriceCalculator","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_expectedTokensAmount","type":"uint256"},{"internalType":"uint16","name":"_slippage","type":"uint16"},{"internalType":"bool","name":"_excludeFee","type":"bool"}],"name":"swap","outputs":[],"stateMutability":"payable","type":"function"}]

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00000000000000000000000027c79ac9f179380ef836c4151754337ecff53b7a000000000000000000000000b0dfce22af9d6ded6a2d2e83a7ecd2bd9f08d5960000000000000000000000008c3f2be95cbda68031c79409de5c0a597fe028da

-----Decoded View---------------
Arg [0] : _admin (address): 0x27c79aC9f179380Ef836C4151754337EcfF53b7A
Arg [1] : _token (address): 0xB0dfcE22aF9d6Ded6A2d2E83a7EcD2BD9f08d596
Arg [2] : _priceCalculator (address): 0x8C3f2be95cBdA68031C79409De5c0a597Fe028DA

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 00000000000000000000000027c79ac9f179380ef836c4151754337ecff53b7a
Arg [1] : 000000000000000000000000b0dfce22af9d6ded6a2d2e83a7ecd2bd9f08d596
Arg [2] : 0000000000000000000000008c3f2be95cbda68031c79409de5c0a597fe028da

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ipfs://0426d78ac6a23aa062cd079d4ed35a710dabad99828b573d712b49470b3f080f