// File: contracts/lib/InitializableOwnable.sol

/*

    Copyright 2020 DODO ZOO.
    SPDX-License-Identifier: Apache-2.0

*/

pragma solidity 0.6.9;
pragma experimental ABIEncoderV2;

/**
 * @title Ownable
 * @author DODO Breeder
 *
 * @notice Ownership related functions
 */
contract InitializableOwnable {
    address public _OWNER_;
    address public _NEW_OWNER_;
    bool internal _INITIALIZED_;

    // ============ Events ============

    event OwnershipTransferPrepared(address indexed previousOwner, address indexed newOwner);

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    // ============ Modifiers ============

    modifier notInitialized() {
        require(!_INITIALIZED_, "DODO_INITIALIZED");
        _;
    }

    modifier onlyOwner() {
        require(msg.sender == _OWNER_, "NOT_OWNER");
        _;
    }

    // ============ Functions ============

    function initOwner(address newOwner) public notInitialized {
        _INITIALIZED_ = true;
        _OWNER_ = newOwner;
    }

    function transferOwnership(address newOwner) public onlyOwner {
        emit OwnershipTransferPrepared(_OWNER_, newOwner);
        _NEW_OWNER_ = newOwner;
    }

    function claimOwnership() public {
        require(msg.sender == _NEW_OWNER_, "INVALID_CLAIM");
        emit OwnershipTransferred(_OWNER_, _NEW_OWNER_);
        _OWNER_ = _NEW_OWNER_;
        _NEW_OWNER_ = address(0);
    }
}

// File: contracts/intf/IERC20.sol


/**
 * @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);

    function decimals() external view returns (uint8);

    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    /**
     * @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);
}

// File: contracts/lib/SafeMath.sol


/**
 * @title SafeMath
 * @author DODO Breeder
 *
 * @notice Math operations with safety checks that revert on error
 */
library SafeMath {
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "MUL_ERROR");

        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "DIVIDING_ERROR");
        return a / b;
    }

    function divCeil(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 quotient = div(a, b);
        uint256 remainder = a - quotient * b;
        if (remainder > 0) {
            return quotient + 1;
        } else {
            return quotient;
        }
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SUB_ERROR");
        return a - b;
    }

    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "ADD_ERROR");
        return c;
    }

    function sqrt(uint256 x) internal pure returns (uint256 y) {
        uint256 z = x / 2 + 1;
        y = x;
        while (z < y) {
            y = z;
            z = (x / z + z) / 2;
        }
    }
}

// File: contracts/DODOFee/FeeRateImpl.sol


interface ICrowdPooling {
    function _QUOTE_RESERVE_() external view returns (uint256);
    function getShares(address user) external view returns (uint256);
}

interface IFee {
    function getUserFee(address user) external view returns (uint256);
}

interface IQuota {
    function getUserQuota(address user) external view returns (int);
}

contract FeeRateImpl is InitializableOwnable {
    using SafeMath for uint256;

    struct CPPoolInfo {
        address quoteToken;
        int globalQuota;
        address feeAddr;
        address quotaAddr;
    }

    mapping(address => CPPoolInfo) cpPools;

    function addCpPoolInfo(address cpPool, address quoteToken, int globalQuota, address feeAddr, address quotaAddr) external onlyOwner {
        CPPoolInfo memory cpPoolInfo =  CPPoolInfo({
            quoteToken: quoteToken,
            feeAddr: feeAddr,
            quotaAddr: quotaAddr,
            globalQuota: globalQuota
        });
        cpPools[cpPool] = cpPoolInfo;
    }

    function setCpPoolInfo(address cpPool, address quoteToken, int globalQuota, address feeAddr, address quotaAddr) external onlyOwner {
        cpPools[cpPool].quoteToken = quoteToken;
        cpPools[cpPool].feeAddr = feeAddr;
        cpPools[cpPool].quotaAddr = quotaAddr;
        cpPools[cpPool].globalQuota = globalQuota;
    }

    function getFeeRate(address pool, address user) external view returns (uint256) {
        CPPoolInfo memory cpPoolInfo = cpPools[pool];
        address quoteToken = cpPoolInfo.quoteToken;
        if(quoteToken == address(0)) {
            return 0;
        }else {
            uint256 userInput = IERC20(quoteToken).balanceOf(pool).sub(ICrowdPooling(pool)._QUOTE_RESERVE_());
            uint256 userStake = ICrowdPooling(pool).getShares(user);
            address feeAddr = cpPoolInfo.feeAddr;
            address quotaAddr = cpPoolInfo.quotaAddr;
            int curQuota = cpPoolInfo.globalQuota;
            if(quotaAddr != address(0))
                curQuota = IQuota(quotaAddr).getUserQuota(user);

            require(curQuota == -1 || (curQuota != -1 && int(userInput.add(userStake)) <= curQuota), "DODOFeeImpl: EXCEED_YOUR_QUOTA");

            if(feeAddr == address(0)) {
                return 0;
            } else {
                return IFee(feeAddr).getUserFee(user);
            }
        }
    }


    function getCPInfoByUser(address pool, address user) external view returns (bool isHaveCap, int curQuota, uint256 userFee) {
        CPPoolInfo memory cpPoolInfo = cpPools[pool];
        if(cpPoolInfo.quoteToken == address(0)) {
            isHaveCap = false;
            curQuota = -1;
            userFee = 0;
        }else {
            address quotaAddr = cpPoolInfo.quotaAddr;
            curQuota = cpPoolInfo.globalQuota;
            if(quotaAddr != address(0))
                curQuota = IQuota(quotaAddr).getUserQuota(user);
        
            if(curQuota == -1) {
                isHaveCap = false;
            }else {
                isHaveCap = true;
                uint256 userStake = ICrowdPooling(pool).getShares(user);
                curQuota = int(uint256(curQuota).sub(userStake));
            }

            address feeAddr = cpPoolInfo.feeAddr;
            if(feeAddr == address(0)) {
                userFee =  0;
            } else {
                userFee = IFee(feeAddr).getUserFee(user);
            }
        }

    }
}