contract PriceOracleInterface {
    address public priceFeedSource;
    address public owner;
    bool public emergencyMode;

    // Modifiers
    modifier onlyOwner() {
        require(msg.sender == owner, "Only the owner can do the operation");
        _;
    }

    /// @dev constructor of the contract
    /// @param _priceFeedSource address of price Feed Source -> should be maker feeds Medianizer contract
    constructor(address _owner, address _priceFeedSource) public {
        owner = _owner;
        priceFeedSource = _priceFeedSource;
    }
    
    /// @dev gives the owner the possibility to put the Interface into an emergencyMode, which will
    /// output always a price of 600 USD. This gives everyone time to set up a new pricefeed.
    function raiseEmergency(bool _emergencyMode) public onlyOwner {
        emergencyMode = _emergencyMode;
    }

    /// @dev updates the priceFeedSource
    /// @param _owner address of owner
    function updateCurator(address _owner) public onlyOwner {
        owner = _owner;
    }

    /// @dev returns the USDETH price
    function getUsdEthPricePeek() public view returns (bytes32 price, bool valid) {
        return Medianizer(priceFeedSource).peek();
    }

    /// @dev returns the USDETH price, ie gets the USD price from Maker feed with 18 digits, but last 18 digits are cut off
    function getUSDETHPrice() public view returns (uint256) {
        // if the contract is in the emergencyMode, because there is an issue with the oracle, we will simply return a price of 600 USD
        if (emergencyMode) {
            return 600;
        }
        (bytes32 price, ) = Medianizer(priceFeedSource).peek();

        // ensuring that there is no underflow or overflow possible,
        // even if the price is compromised
        uint priceUint = uint256(price)/(1 ether);
        if (priceUint == 0) {
            return 1;
        }
        if (priceUint > 1000000) {
            return 1000000; 
        }
        return priceUint;
    }
}
/*
 This contract is the interface between the MakerDAO priceFeed and our DX platform.
 */
function getUsdEthPricePeek() public view returns (bytes32 price, bool valid) {
        return Medianizer(priceFeedSource).peek();
    }
/// @dev returns the USDETH price