42 lines
1.4 KiB
Solidity
42 lines
1.4 KiB
Solidity
/*
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Copyright 2020 DODO ZOO.
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SPDX-License-Identifier: Apache-2.0
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*/
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pragma solidity 0.6.9;
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import {IDODOV1} from "../intf/IDODOV1.sol";
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import {IDODOSellHelper} from "./DODOSellHelper.sol";
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contract DODOSwapCalcHelper {
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address public immutable _DODO_SELL_HELPER_;
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constructor(address dodoSellHelper) public {
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_DODO_SELL_HELPER_ = dodoSellHelper;
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}
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function calcReturnAmountV1(
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uint256 fromTokenAmount,
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address[] memory dodoPairs,
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uint8[] memory directions
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) external view returns (uint256 returnAmount,uint256[] memory midPrices,uint256[] memory feeRates) {
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returnAmount = fromTokenAmount;
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midPrices = new uint256[](dodoPairs.length);
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feeRates = new uint256[](dodoPairs.length);
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for (uint256 i = 0; i < dodoPairs.length; i++) {
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address curDodoPair = dodoPairs[i];
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if (directions[i] == 0) {
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returnAmount = IDODOV1(curDodoPair).querySellBaseToken(returnAmount);
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} else {
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returnAmount = IDODOSellHelper(_DODO_SELL_HELPER_).querySellQuoteToken(
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curDodoPair,
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returnAmount
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);
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}
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midPrices[i] = IDODOV1(curDodoPair).getMidPrice();
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feeRates[i] = IDODOV1(curDodoPair)._MT_FEE_RATE_() + IDODOV1(curDodoPair)._LP_FEE_RATE_();
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}
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}
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} |