// File: contracts/utils/Ownable.sol

pragma solidity >=0.4.21 <0.6.0;

contract Ownable {
    address private _contract_owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = msg.sender;
        _contract_owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _contract_owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_contract_owner == msg.sender, "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_contract_owner, newOwner);
        _contract_owner = newOwner;
    }
}

// File: contracts/core/IPool.sol

pragma solidity >=0.4.21 <0.6.0;

contract ICurvePool{
  function deposit(uint256 _amount) public;
  function withdraw(uint256 _amount) public;

  function get_virtual_price() public view returns(uint256);

  function get_lp_token_balance() public view returns(uint256);

  function get_lp_token_addr() public view returns(address);

  string public name;
}

// File: contracts/utils/SafeMath.sol

pragma solidity >=0.4.21 <0.6.0;

library SafeMath {
    function safeAdd(uint a, uint b) public pure returns (uint c) {
        c = a + b;
        require(c >= a, "add");
    }
    function safeSubR(uint a, uint b, string memory s) public pure returns (uint c) {
        require(b <= a, s);
        c = a - b;
    }
    function safeSub(uint a, uint b) public pure returns (uint c) {
        require(b <= a, "sub");
        c = a - b;
    }
    function safeMul(uint a, uint b) public pure returns (uint c) {
        c = a * b;
        require(a == 0 || c / a == b, "mul");
    }
    function safeDiv(uint a, uint b) public pure returns (uint c) {
        require(b > 0, "div");
        c = a / b;
    }
    function safeDivR(uint a, uint b, string memory s) public pure returns (uint c) {
        require(b > 0, s);
        c = a / b;
    }
}

// File: contracts/utils/Address.sol

pragma solidity >=0.4.21 <0.6.0;

library Address {
    function isContract(address account) internal view returns (bool) {
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != 0x0 && codehash != accountHash);
    }
    function toPayable(address account) internal pure returns (address payable) {
        return address(uint160(account));
    }
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-call-value
        (bool success, ) = recipient.call.value(amount)("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
}

// File: contracts/erc20/IERC20.sol

pragma solidity >=0.4.21 <0.6.0;

interface IERC20 {
    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address recipient, uint256 amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint256);
    function approve(address spender, uint256 amount) external returns (bool);
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// File: contracts/erc20/SafeERC20.sol

pragma solidity >=0.4.21 <0.6.0;




library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).safeAdd(value);
        callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).safeSub(value);
        callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }
    function callOptionalReturn(IERC20 token, bytes memory data) private {
        require(address(token).isContract(), "SafeERC20: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "SafeERC20: low-level call failed");

        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

// File: contracts/core/ethpool/IETHPoolBase.sol

pragma solidity >=0.4.21 <0.6.0;





contract PriceInterfaceEth{
  function get_virtual_price() public view returns(uint256);
}

contract IETHPoolBase is ICurvePool, Ownable{
  using SafeERC20 for IERC20;

  address public controller;
  address public vault;
  address public lp_token_addr;

  uint256 public lp_balance;
  uint256 public deposit_eth_amount;
  uint256 public withdraw_eth_amount;

  modifier onlyController(){
    require((controller == msg.sender)||(vault == msg.sender), "only controller can call this");
    _;
  }

  constructor() public{}

  function deposit_eth(uint256 amount) internal;

  function deposit(uint256 amount) public onlyController{
    require(amount <= address(this).balance, "IETHPoolBase, not enough amount");
    uint _amount = amount;
    deposit_eth_amount = deposit_eth_amount + _amount;
    deposit_eth(_amount);
    uint256 cur = IERC20(lp_token_addr).balanceOf(address(this));
    lp_balance = lp_balance + cur;
    IERC20(lp_token_addr).safeTransfer(msg.sender, cur);
  }

  function withdraw_from_curve(uint256 _amount) internal;

  //@_amount: lp token amount
  function withdraw(uint256 _amount) public onlyController{
      withdraw_from_curve(_amount);
      lp_balance = lp_balance - _amount;

      (bool status, ) = msg.sender.call.value(address(this).balance)("");
      require(status, "IETHPoolBase transfer eth failed");
  }

  function setController(address _controller, address _vault) public onlyOwner{
    controller = _controller;
    vault = _vault;
  }

  function get_lp_token_balance() public view returns(uint256){
    return lp_balance;
  }

  function get_lp_token_addr() public view returns(address){
    return lp_token_addr;
  }

  function() external payable{}
  function callWithData(address payable to, bytes memory data)public payable onlyOwner{
    (bool status, ) = to.call.value(msg.value)(data);
    require(status, "call failed");
  }
}

// File: contracts/core/ethpool/StethPool.sol

pragma solidity >=0.4.21 <0.6.0;




contract CurveInterfaceSteth{
  function add_liquidity(uint256[2] memory amounts, uint256 min_mint_amount) public payable returns(uint256);
  function remove_liquidity_one_coin(uint256 _token_amount, int128 i, uint256 min_mint_amount) public returns(uint256);
}

contract StethPool is IETHPoolBase{
  using SafeERC20 for IERC20;

  CurveInterfaceSteth public pool_deposit;

  constructor() public{
    name = "Steth";
    lp_token_addr = address(0x06325440D014e39736583c165C2963BA99fAf14E);
    pool_deposit = CurveInterfaceSteth(0xDC24316b9AE028F1497c275EB9192a3Ea0f67022);
    //extra_token_addr = address(0x5A98FcBEA516Cf06857215779Fd812CA3beF1B32);
  }

  function deposit_eth(uint256 _amount) internal {
    uint256[2] memory uamounts = [_amount, 0];
    pool_deposit.add_liquidity.value(_amount)(uamounts, 0);
  }


  function withdraw_from_curve(uint256 _amount) internal{
    require(_amount <= get_lp_token_balance(), "withdraw_from_curve: too large amount");
    require(address(pool_deposit).balance > 0, "money is 0");
    pool_deposit.remove_liquidity_one_coin(_amount, 0, 0);
  }

  function get_virtual_price() public view returns(uint256){
    return PriceInterfaceEth(address(pool_deposit)).get_virtual_price();
  }
}