// 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);

  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: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: @openzeppelin/contracts/utils/Context.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

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) {
        return msg.data;
    }
}

// File: contracts/interfaces/drops/IChainlinkPriceFactory.sol



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

interface IChainlinkPriceFactory {
    function getUSDPrice(address asset) external view returns (int256);

    function getETHPrice(address asset) external view returns (int256);
}

// File: contracts/oracle/ChainlinkPriceFactory.sol



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

import '@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol';
import '@openzeppelin/contracts/access/Ownable.sol';
import '../interfaces/drops/IChainlinkPriceFactory.sol';

/**
 * @title aggregator contract that provides USD price of tokens
 */
contract ChainlinkPriceFactory is Ownable, IChainlinkPriceFactory {
    /// @notice ETH/USD chainlink aggregator
    AggregatorV3Interface constant ETH_USD =
        AggregatorV3Interface(0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419);

    /// @notice token asset => address of USD chainlink aggregators
    mapping(address => AggregatorV3Interface) usdAggregators;

    /// @notice token asset => address of ETH chainlink aggregators
    mapping(address => AggregatorV3Interface) ethAggregators;

    function decimals() external pure returns (uint8) {
        return 18;
    }

    function setUSDAggregator(address asset, AggregatorV3Interface aggregator) external onlyOwner {
        require(asset != address(0), '!asset');
        usdAggregators[asset] = aggregator;
    }

    function setETHAggregator(address asset, AggregatorV3Interface aggregator) external onlyOwner {
        require(asset != address(0), '!asset');
        ethAggregators[asset] = aggregator;
    }

    function _formatDecimals(int256 price, uint8 priceDecimals) internal pure returns (int256) {
        if (priceDecimals == 18) {
            return price;
        } else if (priceDecimals > 18) {
            return price / int256(10 ** (priceDecimals - 18));
        }
        return price * int256(10 ** (18 - priceDecimals));
    }

    function _getETHUSDPrice() internal view returns (int256) {
        (, int256 ethPrice, , , ) = ETH_USD.latestRoundData(); // decimal is 8
        return _formatDecimals(ethPrice, 8);
    }

    function getUSDPrice(address asset) public view override returns (int256 price) {
        require(asset != address(0), '!asset');
        AggregatorV3Interface aggregator;

        if (address(usdAggregators[asset]) != address(0)) {
            aggregator = usdAggregators[asset];
            (, int256 answer, , , ) = aggregator.latestRoundData();
            price = _formatDecimals(answer, aggregator.decimals());
        } else if (address(ethAggregators[asset]) != address(0)) {
            aggregator = ethAggregators[asset];
            (, int256 ethPrice, , , ) = aggregator.latestRoundData();
            ethPrice = _formatDecimals(ethPrice, aggregator.decimals());
            price = (ethPrice * _getETHUSDPrice()) / (10 ** 18);
        }
    }

    function getETHPrice(address asset) external view override returns (int256 price) {
        require(asset != address(0), '!asset');
        int256 usdPrice = getUSDPrice(asset);

        if (usdPrice > 0) {
            price = (usdPrice * (10 ** 18)) / _getETHUSDPrice();
        }
    }
}