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

pragma solidity 0.5.17;

interface ProtocolLike {
	function borrowOrTradeFromPool(
		bytes32 loanParamsId,
		bytes32 loanId, // if 0, start a new loan
		bool isTorqueLoan,
		uint256 initialMargin,
		address[4] calldata sentAddresses,
		// lender: must match loan if loanId provided
		// borrower: must match loan if loanId provided
		// receiver: receiver of funds (address(0) assumes borrower address)
		// manager: delegated manager of loan unless address(0)
		uint256[5] calldata sentValues,
		// newRate: new loan interest rate
		// newPrincipal: new loan size (borrowAmount + any borrowed interest)
		// torqueInterest: new amount of interest to escrow for Torque loan (determines initial loan length)
		// loanTokenReceived: total loanToken deposit (amount not sent to borrower in the case of Torque loans)
		// collateralTokenReceived: total collateralToken deposit
		bytes calldata loanDataBytes
	) external payable returns (uint256 newPrincipal, uint256 newCollateral);

	function getTotalPrincipal(address lender, address loanToken) external view returns (uint256);

	function withdrawAccruedInterest(address loanToken) external;

	function getLenderInterestData(address lender, address loanToken)
		external
		view
		returns (
			uint256 interestPaid,
			uint256 interestPaidDate,
			uint256 interestOwedPerDay,
			uint256 interestUnPaid,
			uint256 interestFeePercent,
			uint256 principalTotal
		);

	function priceFeeds() external view returns (address);

	function getEstimatedMarginExposure(
		address loanToken,
		address collateralToken,
		uint256 loanTokenSent,
		uint256 collateralTokenSent,
		uint256 interestRate,
		uint256 newPrincipal
	) external view returns (uint256);

	function getRequiredCollateral(
		address loanToken,
		address collateralToken,
		uint256 newPrincipal,
		uint256 marginAmount,
		bool isTorqueLoan
	) external view returns (uint256 collateralAmountRequired);

	function getBorrowAmount(
		address loanToken,
		address collateralToken,
		uint256 collateralTokenAmount,
		uint256 marginAmount,
		bool isTorqueLoan
	) external view returns (uint256 borrowAmount);

	function isLoanPool(address loanPool) external view returns (bool);

	function lendingFeePercent() external view returns (uint256);

	function getSwapExpectedReturn(
		address sourceToken,
		address destToken,
		uint256 sourceTokenAmount
	) external view returns (uint256);
}