import {z} from 'zod'

export type GetApiPairArgs = {baseToken: string, quoteToken: string};

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

export const pair = z.object({id: z.string().optional(), baseTokenSymbol: z.string().optional(), baseTokenAddress: z.string().optional(), baseTokenDecimals: z.number().int().optional(), quoteTokenSymbol: z.string().optional(), quoteTokenAddress: z.string().optional(), quoteTokenDecimals: z.number().int().optional(), listed: z.boolean().optional(), active: z.boolean().optional(), rank: z.number().int().optional(), makeFee: z.string().optional(), takeFee: z.string().optional(), createdAt: z.string().optional(), updatedAt: z.string().optional()});

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
};

/**
 * Retrieve the pair information corresponding to a baseToken and a quoteToken
 * 
 * GET /pair
 */
export const getApiPair = async (args: GetApiPairArgs, options?: GetApiPairOptions) => {
const {baseUrl = "https://dex.tomochain.com/api", fetch: fetchFn = fetch} = options ?? {}

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

if (args.baseToken != null) query.append("baseToken", String(args.baseToken))
if (args.quoteToken != null) query.append("quoteToken", String(args.quoteToken))

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