import {z} from 'zod'

export type GetApiV2TradeQuoteArgs = {tokenIn: string, tokenOut: string, amountIn?: string | undefined, amountOut?: string | undefined, fee?: number | undefined};

export type GetApiV2TradeQuoteOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const quoteDataResponseDto = z.object({contractVersion: z.literal("v2"), fee: z.number(), amountIn: z.string(), amountOut: z.string(), currentSqrtPrice: z.string(), newSqrtPrice: z.string(), newTick: z.number(), tradingFees: z.string(), protocolFees: z.string(), totalFees: z.string(), feeTokenSymbol: z.string(), token0Symbol: z.string(), token1Symbol: z.string(), tokenInIsToken0: z.boolean()});

export const quoteResponseDto = z.object({status: z.number(), message: z.string(), error: z.boolean(), data: quoteDataResponseDto});

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * Offline-simulated quote against new-contract pools
 * 
 * GET /v2/trade/quote
 */
export const getApiV2TradeQuote = async (args: GetApiV2TradeQuoteArgs, options?: GetApiV2TradeQuoteOptions) => {
const {baseUrl = "https://swap-backend.stage.defi.ovh.gala.com", fetch: fetchFn = fetch} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('accept', "application/json")

if (args.tokenIn != null) query.append("tokenIn", String(args.tokenIn))
if (args.tokenOut != null) query.append("tokenOut", String(args.tokenOut))
if (args.amountIn != null) query.append("amountIn", String(args.amountIn))
if (args.amountOut != null) query.append("amountOut", String(args.amountOut))
if (args.fee != null) query.append("fee", String(args.fee))

const url = `${baseUrl.replace(/\/+$/, '')}/v2/trade/quote${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "GET", headers})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(quoteResponseDto, await res.json())
};