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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,106 @@ | ||
| import {useQuery} from "@tanstack/react-query"; | ||
| import {CurrencyBoxMode, SwapState} from "@/src/components/common/Swap/Swap"; | ||
| import useSwapData from "@/src/hooks/useAssetPair/useSwapData"; | ||
| import useReadonlyMira from "@/src/hooks/useReadonlyMira"; | ||
| import {buildPoolId, PoolId} from "mira-dex-ts"; | ||
|
|
||
| type Props = { | ||
| swapState: SwapState; | ||
| mode: CurrencyBoxMode; | ||
| } | ||
|
|
||
| type TradeType = 'ExactInput' | 'ExactOutput'; | ||
|
|
||
| type MultihopPreviewData = { | ||
| path: [string, string, boolean][]; | ||
| input_amount: number; | ||
| output_amount: number; | ||
| }; | ||
|
|
||
| type SwapPreviewData = { | ||
| pools: PoolId[]; | ||
| previewAmount: number; | ||
| }; | ||
|
|
||
| const useSwapPreview = ({ swapState, mode }: Props) => { | ||
| const { | ||
| sellAssetIdInput, | ||
| buyAssetIdInput, | ||
| sellDecimals, | ||
| buyDecimals, | ||
| } = useSwapData(swapState); | ||
| const inputAssetId = sellAssetIdInput.bits; | ||
| const outputAssetId = buyAssetIdInput.bits; | ||
|
|
||
| const amountString = mode === 'sell' ? swapState.sell.amount : swapState.buy.amount; | ||
| const amount = parseFloat(amountString); | ||
| const amountValid = !isNaN(amount); | ||
| const decimals = mode === 'sell' ? sellDecimals : buyDecimals; | ||
| const normalizedAmount = amountValid ? amount * 10 ** decimals : 0; | ||
| const amountNonZero = normalizedAmount > 0; | ||
|
|
||
| const tradeType: TradeType = mode === 'sell' ? 'ExactInput' : 'ExactOutput'; | ||
|
|
||
| const { data: multihopPreviewData, error: multihopPreviewError, isFetching: multihopPreviewFetching } = useQuery({ | ||
| queryKey: ['multihopPreview', inputAssetId, outputAssetId, normalizedAmount, tradeType], | ||
| queryFn: async () => { | ||
| const res = await fetch('https://dev.api.mira.ly/find_route', { | ||
| method: 'POST', | ||
| headers: { | ||
| 'Content-Type': 'application/json', | ||
| }, | ||
| body: JSON.stringify({ | ||
| input: inputAssetId, | ||
| output: outputAssetId, | ||
| amount: normalizedAmount, | ||
| trade_type: tradeType, | ||
| }), | ||
| }); | ||
|
|
||
| return await res.json(); | ||
| }, | ||
| retry: 2, | ||
| enabled: amountNonZero, | ||
| }); | ||
|
|
||
| const miraAmm = useReadonlyMira(); | ||
| const miraExists = Boolean(miraAmm); | ||
| const pool = buildPoolId(inputAssetId, outputAssetId, false); | ||
| const shouldFetchFallback = Boolean(multihopPreviewError) && miraExists && amountNonZero; | ||
|
|
||
| const { data: fallbackPreviewData, error: fallbackPreviewError, isFetching: fallbackPreviewFetching } = useQuery({ | ||
| queryKey: ['fallbackPreview', inputAssetId, outputAssetId, normalizedAmount], | ||
| queryFn: async () => { | ||
| return mode === 'sell' ? | ||
| await miraAmm?.previewSwapExactInput( | ||
| sellAssetIdInput, | ||
| normalizedAmount, | ||
| [pool], | ||
| ) : | ||
| await miraAmm?.previewSwapExactOutput( | ||
| buyAssetIdInput, | ||
| normalizedAmount, | ||
| [pool], | ||
| ); | ||
| }, | ||
| enabled: shouldFetchFallback, | ||
| }); | ||
|
|
||
| let previewData: SwapPreviewData | null = null; | ||
| if (multihopPreviewData) { | ||
| const { path, input_amount, output_amount } = multihopPreviewData as MultihopPreviewData; | ||
| previewData = { | ||
| pools: path.map(([input, output, stable]) => buildPoolId(`0x${input}`, `0x${output}`, stable)), | ||
| previewAmount: mode === 'sell' ? output_amount : input_amount, | ||
| }; | ||
| } else if (fallbackPreviewData) { | ||
| previewData = { | ||
| pools: [pool], | ||
| previewAmount: fallbackPreviewData[1].toNumber(), | ||
| }; | ||
| } | ||
|
|
||
| return { previewData, previewFetching: multihopPreviewFetching || fallbackPreviewFetching, previewError: multihopPreviewError || fallbackPreviewError }; | ||
| }; | ||
|
|
||
| export default useSwapPreview; |