// 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/IAggregator.sol



//SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

interface IAggregator {
  function decimals() external view returns (uint8);
  function latestRoundData()
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );
}
// File: contracts/interfaces/IOracle.sol



//SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

/**
 * @title IOracle
 * @author LC
 * @notice Defines the basic interface for the Oracle
 */
interface IOracle {

  /**
   * @dev Emitted after the price source of an asset is updated
   * @param asset The address of the asset
   * @param source The price source of the asset
   */
  event AssetSourceUpdated(address indexed asset, address indexed source);

  /**
   * @notice Sets or replaces price sources of assets
   * @param assets The addresses of the assets
   * @param sources The addresses of the price sources
   */
  function setAssetSources(address[] calldata assets, address[] calldata sources) external;

  /**
   * @notice Returns the asset price in the base currency
   * @param asset The address of the asset
   * @return The price of the asset
   */
  function getAssetPrice(address asset) external view returns (uint256);

  /**
   * @notice Returns a list of prices from a list of assets addresses
   * @param assets The list of assets addresses
   * @return The prices of the given assets
   */
  function getAssetsPrices(address[] calldata assets) external view returns (uint256[] memory);

  /**
   * @notice Returns the address of the source for an asset address
   * @param asset The address of the asset
   * @return The address of the source
   */
  function getSourceOfAsset(address asset) external view returns (address);
}

// File: contracts/Oracle.sol



//SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

import "@openzeppelin/contracts/access/Ownable.sol";
import "./interfaces/IAggregator.sol";
import './interfaces/IOracle.sol';

/**
 * @title Oracle
 * @author LC
 * @notice Contract to get asset prices, manage price sources
 */
contract Oracle is IOracle, Ownable {

  // Map of asset price sources (asset => priceSource)
  mapping(address => IAggregator) private assetsSources;

  /**
   * @notice Constructor
   * @param assets The addresses of the assets
   * @param sources The address of the source of each asset
   */
  constructor(
    address[] memory assets,
    address[] memory sources
  ) {
    _setAssetsSources(assets, sources);
  }

  function setAssetSources(
    address[] calldata assets,
    address[] calldata sources
  ) external override onlyOwner {
    _setAssetsSources(assets, sources);
  }

  /**
   * @notice Internal function to set the sources for each asset
   * @param assets The addresses of the assets
   * @param sources The address of the source of each asset
   */
  function _setAssetsSources(address[] memory assets, address[] memory sources) internal {
    require(assets.length == sources.length, "Array parameters should be equal");
    for (uint256 i = 0; i < assets.length; i++) {
      assetsSources[assets[i]] = IAggregator(sources[i]);
      emit AssetSourceUpdated(assets[i], sources[i]);
    }
  }

  function getAssetPrice(address asset) public view override returns (uint256) {
    IAggregator source = assetsSources[asset];

    if (address(source) == address(0)) {
      return 0;
    }

    (
      /* uint80 roundID */,
      int price,
      /*uint startedAt*/,
      /*uint timeStamp*/,
      /*uint80 answeredInRound*/
    ) = source.latestRoundData();

    return uint256(price);
  }

  function getAssetsPrices(
    address[] calldata assets
  ) external view override returns (uint256[] memory) {
    uint256[] memory prices = new uint256[](assets.length);
    for (uint256 i = 0; i < assets.length; i++) {
      prices[i] = getAssetPrice(assets[i]);
    }
    return prices;
  }

  function getSourceOfAsset(address asset) external view override returns (address) {
    return address(assetsSources[asset]);
  }
}