import {z} from 'zod'

export type GetApiV2TradeOpportunitiesArgs = {limit?: number | undefined};

export type GetApiV2TradeOpportunitiesOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const tradeV2OpportunityPoolResponseDto = z.object({fee: z.number(), tickSpacing: z.number(), protocolFees: z.number(), tradingFees: z.number(), creator: z.string().optional(), token0CompositeKey: z.string().optional(), token1CompositeKey: z.string().optional(), token0Image: z.string(), token1Image: z.string(), contractVersion: z.literal("v2"), token0: z.string(), token1: z.string(), poolName: z.string(), poolRef: z.string(), price: z.string().optional(), sqrtPrice: z.string().optional(), tick: z.number().optional(), token0Tvl: z.string().optional(), token1Tvl: z.string().optional(), tvlUsd: z.number().optional(), volume1d: z.number().optional(), volume7d: z.number().optional(), volume30d: z.number().optional(), trades1d: z.number().optional(), fee24h: z.number().optional(), apr1d: z.number().optional(), token0Price: z.number().optional(), token1Price: z.number().optional(), signals: z.array(z.enum(["new-active", "trending", "high-turnover", "high-fee", "top-volume", "bot-viable"])), opportunityScore: z.number()});

export const tradeV2OpportunitiesDataResponseDto = z.object({pools: z.array(tradeV2OpportunityPoolResponseDto), count: z.number()});

export const tradeV2OpportunitiesResponseDto = z.object({status: z.number(), message: z.string(), error: z.boolean(), data: tradeV2OpportunitiesDataResponseDto});

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
};

/**
 * Ranked new-contract opportunity pools
 * 
 * GET /v2/trade/opportunities
 */
export const getApiV2TradeOpportunities = async (args: GetApiV2TradeOpportunitiesArgs, options?: GetApiV2TradeOpportunitiesOptions) => {
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.limit != null) query.append("limit", String(args.limit))

const url = `${baseUrl.replace(/\/+$/, '')}/v2/trade/opportunities${query.size > 0 ? `?${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(tradeV2OpportunitiesResponseDto, await res.json())
};