import {z} from 'zod'

export type SwapRequest = {request_id: string, source_currency: 'USDC' | 'USDT' | 'USD', target_currency: 'USDC' | 'USDT' | 'USD', amount: string, min_output_amount?: string | undefined};

export type CreateApiSwapArgs = {'X-API-Key-ID': string, 'X-API-Timestamp': string, 'X-API-Nonce': string, Digest: string, Authorization: string, body: SwapRequest};

export type CreateApiSwapOptions = {baseUrl?: string | undefined, Ed25519?: string | undefined, fetch?: typeof fetch | undefined};

export const swapResponse = z.object({request_id: z.string(), output_amount: z.string(), price: z.string(), fx_fee: z.string(), fx_fee_currency: z.enum(["USDC", "USDT", "USD"]), is_duplicate: z.boolean()});

export const swapEnvelope = z.object({code: z.literal(0), message: z.string(), data: swapResponse});

export const errorEnvelope = z.object({code: z.number().int().gte(1), message: z.string(), data: z.object({}).nullable()});

export const createApiSwapResponse = z.union([swapEnvelope, errorEnvelope]);

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
};

/**
 * Swap funds
 * 
 * POST /swap
 */
export const createApiSwap = async (args: CreateApiSwapArgs, options?: CreateApiSwapOptions) => {
const {baseUrl = "https://openapi.infini.money/v2/funds", fetch: fetchFn = fetch, Ed25519} = options ?? {}

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

if (args['X-API-Key-ID'] != null) headers.set("X-API-Key-ID", String(args['X-API-Key-ID']))
if (args['X-API-Timestamp'] != null) headers.set("X-API-Timestamp", String(args['X-API-Timestamp']))
if (args['X-API-Nonce'] != null) headers.set("X-API-Nonce", String(args['X-API-Nonce']))
if (args.Digest != null) headers.set("Digest", String(args.Digest))
if (args.Authorization != null) headers.set("Authorization", String(args.Authorization))
if (Ed25519 !== undefined) headers.set("Authorization", Ed25519)

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

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

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

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