// File: contracts/XanaPriceFeed.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

import "@openzeppelin/contracts/access/Ownable.sol";

interface IXanaAddressRegistry {
    function tokenRegistry() external view returns (address);
}

interface IXanaTokenRegistry {
    function enabled(address) external returns (bool);
}

interface IOracle {
    function decimals() external view returns (uint8);

    function latestAnswer() external view returns (int256);
}

contract XanaPriceFeed is Ownable {
    /// @notice keeps track of oracles for each tokens
    mapping(address => address) public oracles;

    /// @notice xana address registry contract
    address public addressRegistry;

    /// @notice wrapped ETH contract
    address public wETH;

    constructor(address _addressRegistry, address _wETH) public {
        addressRegistry = _addressRegistry;
        wETH = _wETH;
    }

    /**
     @notice Register oracle contract to token
     @dev Only owner can register oracle
     @param _token ERC20 token address
     @param _oracle Oracle address
     */
    function registerOracle(address _token, address _oracle)
        external
        onlyOwner
    {
        IXanaTokenRegistry tokenRegistry = IXanaTokenRegistry(
            IXanaAddressRegistry(addressRegistry).tokenRegistry()
        );
        require(tokenRegistry.enabled(_token), "invalid token");
        require(oracles[_token] == address(0), "oracle already set");

        oracles[_token] = _oracle;
    }

    /**
     @notice Update oracle address for token
     @dev Only owner can update oracle
     @param _token ERC20 token address
     @param _oracle Oracle address
     */
    function updateOracle(address _token, address _oracle) external onlyOwner {
        require(oracles[_token] != address(0), "oracle not set");

        oracles[_token] = _oracle;
    }

    /**
     @notice Get current price for token
     @dev return current price or if oracle is not registered returns 0
     @param _token ERC20 token address
     */
    function getPrice(address _token) external view returns (int256, uint8) {
        if (oracles[_token] == address(0)) {
            return (0, 0);
        }

        IOracle oracle = IOracle(oracles[_token]);
        return (oracle.latestAnswer(), oracle.decimals());
    }

    /**
     @notice Update address registry contract
     @dev Only admin
     */
    function updateAddressRegistry(address _addressRegistry)
        external
        onlyOwner
    {
        addressRegistry = _addressRegistry;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <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 () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

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

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



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <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 GSN 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 payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}