// File: contracts/adapter/ChainlinkAdapter.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol";
import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
import "@mochifi/library/contracts/Float.sol";
import "../interfaces/IGovernanceOwned.sol";
import "../interfaces/ICSSRAdapter.sol";

contract ChainlinkAdapterEth is ICSSRAdapter {
    IGovernanceOwned public immutable owned;

    mapping(address => AggregatorV3Interface) public feed;

    modifier onlyGov() {
        require(msg.sender == owned.governance(), "!gov");
        _;
    }

    constructor(address _owned) {
        owned = IGovernanceOwned(_owned);
    }

    function update(address _asset, bytes calldata _data)
        external
        override
        returns (float memory)
    {
        return getPrice(_asset);
    }

    function setFeed(address[] calldata _assets, address[] calldata _feeds) external onlyGov {
        for(uint256 i = 0; i<_assets.length; i++) {
            feed[_assets[i]] = AggregatorV3Interface(_feeds[i]);
        }
    }

    function support(address _asset) external view override returns (bool) {
        return address(feed[_asset]) != address(0);
    }

    function getPrice(address _asset)
        public
        view
        override
        returns (float memory)
    {
        (, int256 price, , , ) = feed[_asset].latestRoundData();
        uint256 decimalSum = feed[_asset].decimals() +
            IERC20Metadata(_asset).decimals();
        if (decimalSum > 18) {
            return
                float({
                    numerator: uint256(price),
                    denominator: 10**(decimalSum - 18)
                });
        } else {
            return
                float({
                    numerator: uint256(price) * 10**(18 - decimalSum),
                    denominator: 1
                });
        }
    }

    function getLiquidity(address _asset)
        external
        view
        override
        returns (uint256)
    {
        revert("chainlink adapter does not support liquidity");
    }
}

// File: @openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @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);
}

// File: @chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface AggregatorV3Interface {

  function decimals()
    external
    view
    returns (
      uint8
    );

  function description()
    external
    view
    returns (
      string memory
    );

  function version()
    external
    view
    returns (
      uint256
    );

  // getRoundData and latestRoundData should both raise "No data present"
  // if they do not have data to report, instead of returning unset values
  // which could be misinterpreted as actual reported values.
  function getRoundData(
    uint80 _roundId
  )
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

  function latestRoundData()
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

}

// File: @mochifi/library/contracts/Float.sol



// SPDX-License-Identifier: AGPL-3.0

pragma solidity ^0.8.0;

struct float {
    uint256 numerator;
    uint256 denominator;
}

library Float {
    function multiply(uint256 a, float memory f) internal pure returns(uint256) {
        require(f.denominator != 0, "div 0");
        return a * f.numerator / f.denominator;
    }

    function inverse(float memory f) internal pure returns(float memory) {
        require(f.numerator != 0 && f.denominator != 0, "div 0");
        return float({
            numerator: f.denominator,
            denominator: f.numerator
        });
    }

    function divide(uint256 a, float memory f) internal pure returns(uint256) {
        require(f.denominator != 0, "div 0");
        return a * f.denominator / f.numerator;
    }

    function add(float memory a, float memory b) internal pure returns(float memory res) {
        require(a.denominator != 0 && b.denominator != 0, "div 0");
        res = float({
            numerator : a.numerator*b.denominator + a.denominator*b.numerator,
            denominator : a.denominator*b.denominator
        });
        if(res.numerator > 2**128 && res.denominator > 2**128){
            res.numerator = res.numerator / 2**64;
            res.denominator = res.denominator / 2**64;
        }
    }
    
    function sub(float memory a, float memory b) internal pure returns(float memory res) {
        require(a.denominator != 0 && b.denominator != 0, "div 0");
        res = float({
            numerator : a.numerator*b.denominator - b.numerator*a.denominator,
            denominator : a.denominator*b.denominator
        });
        if(res.numerator > 2**128 && res.denominator > 2**128){
            res.numerator = res.numerator / 2**64;
            res.denominator = res.denominator / 2**64;
        }
    }

    function mul(float memory a, float memory b) internal pure returns(float memory res) {
        require(a.denominator != 0 && b.denominator != 0, "div 0");
        res = float({
            numerator : a.numerator * b.numerator,
            denominator : a.denominator * b.denominator
        });
        if(res.numerator > 2**128 && res.denominator > 2**128){
            res.numerator = res.numerator / 2**64;
            res.denominator = res.denominator / 2**64;
        }
    }

    function gt(float memory a, float memory b) internal pure returns(bool) {
        require(a.denominator != 0 && b.denominator != 0, "div 0");
        return a.numerator * b.denominator > a.denominator * b.numerator;
    }

    function lt(float memory a, float memory b) internal pure returns(bool) {
        require(a.denominator != 0 && b.denominator != 0, "div 0");
        return a.numerator * b.denominator < a.denominator * b.numerator;
    }

    function gte(float memory a, float memory b) internal pure returns(bool) {
        require(a.denominator != 0 && b.denominator != 0, "div 0");
        return a.numerator * b.denominator >= a.denominator * b.numerator;
    }

    function lte(float memory a, float memory b) internal pure returns(bool) {
        require(a.denominator != 0 && b.denominator != 0, "div 0");
        return a.numerator * b.denominator <= a.denominator * b.numerator;
    }

    function equals(float memory a, float memory b) internal pure returns(bool) {
        require(a.denominator != 0 && b.denominator != 0, "div 0");
        return a.numerator * b.denominator == b.numerator * a.denominator;
    }
}

// File: contracts/interfaces/IGovernanceOwned.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

interface IGovernanceOwned {
    function governance() external view returns (address);
}

// File: contracts/interfaces/ICSSRAdapter.sol



// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@mochifi/library/contracts/Float.sol";

interface ICSSRAdapter {
    function update(address _asset, bytes memory _data)
        external
        returns (float memory price);

    function support(address _asset) external view returns (bool);

    function getPrice(address _asset)
        external
        view
        returns (float memory price);

    function getLiquidity(address _asset)
        external
        view
        returns (uint256 _liquidity);
}

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT

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);
}