/**
 * Copyright 2017-2021, bZeroX, LLC. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0.
 */

pragma solidity 0.5.17;

interface IPriceFeeds {
	function queryRate(address sourceToken, address destToken) external view returns (uint256 rate, uint256 precision);

	function queryPrecision(address sourceToken, address destToken) external view returns (uint256 precision);

	function queryReturn(
		address sourceToken,
		address destToken,
		uint256 sourceAmount
	) external view returns (uint256 destAmount);

	function checkPriceDisagreement(
		address sourceToken,
		address destToken,
		uint256 sourceAmount,
		uint256 destAmount,
		uint256 maxSlippage
	) external view returns (uint256 sourceToDestSwapRate);

	function amountInEth(address Token, uint256 amount) external view returns (uint256 ethAmount);

	function getMaxDrawdown(
		address loanToken,
		address collateralToken,
		uint256 loanAmount,
		uint256 collateralAmount,
		uint256 maintenanceMargin
	) external view returns (uint256);

	function getCurrentMarginAndCollateralSize(
		address loanToken,
		address collateralToken,
		uint256 loanAmount,
		uint256 collateralAmount
	) external view returns (uint256 currentMargin, uint256 collateralInEthAmount);

	function getCurrentMargin(
		address loanToken,
		address collateralToken,
		uint256 loanAmount,
		uint256 collateralAmount
	) external view returns (uint256 currentMargin, uint256 collateralToLoanRate);

	function shouldLiquidate(
		address loanToken,
		address collateralToken,
		uint256 loanAmount,
		uint256 collateralAmount,
		uint256 maintenanceMargin
	) external view returns (bool);

	function getFastGasPrice(address payToken) external view returns (uint256);
}