import {z} from 'zod'

export type ApiTransactionsCustomFee = {fixed_fee?: string | undefined, percentage_fee?: number | undefined, min_percentage_fee_fixed?: string | undefined, max_percentage_fee_fixed?: string | undefined};

export type ApiTokenAddress = {blockchain: string, address: string};

export type ApiTokenVerification = 'whitelisted' | 'blacklisted' | 'community' | 'unknown';

export type ApiTokenMetadata = {name: string, symbol: string, decimals: number, image_url?: string | undefined, listed: boolean, verification: ApiTokenVerification};

export type ApiToken = {address: ApiTokenAddress, metadata: ApiTokenMetadata};

export type ApiSwapResult = 'fully_fulfilled' | 'partially_fulfilled' | 'unavailable';

export type ApiPoolReserves = Array<number>;

export type ApiSwap = {result: ApiSwapResult, input_amount: number, output_amount: number, before_reserves: ApiPoolReserves, after_reserves: ApiPoolReserves, reason?: string | undefined, left_amount?: number | undefined};

export type ApiRoutingStep = {blockchain: string, dex: string, pool_address: string, input_token: ApiToken, output_token: ApiToken, swap: ApiSwap, recommended_gas: number, average_gas: number, next?: Array<ApiRoutingStep> | undefined};

export type ApiTransactionsRequest = {sender_address: string, slippage?: number | undefined, dynamic_slippage?: boolean | undefined, referral_name?: string | undefined, custom_fee?: ApiTransactionsCustomFee | undefined, mev_protection?: boolean | undefined, paths: Array<ApiRoutingStep>};

export type CreateApiV2RouteTransactionsArgs = {body: ApiTransactionsRequest};

export type CreateApiV2RouteTransactionsOptions = {baseUrl?: string | undefined, ApiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const apiSwapTransaction = z.object({address: z.string(), value: z.string(), cell: z.string(), stateInit: z.string().optional(), send_mode: z.number().int(), query_id: z.number().int()});

export const apiTransactionsResponse = z.object({route_id: z.number().int(), transactions: z.array(apiSwapTransaction)});

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
};

/**
 * Returns pre-built transactions for the given route. It is assumed that transactions will be signed and sent by the sender via wallet
 * 
 * POST /v2/route/transactions
 */
export const createApiV2RouteTransactions = async (args: CreateApiV2RouteTransactionsArgs, options?: CreateApiV2RouteTransactionsOptions) => {
const {baseUrl = "https://backend.swap.coffee", fetch: fetchFn = fetch, ApiKey} = options ?? {}

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

if (ApiKey !== undefined) headers.set("X-Api-Key", ApiKey)

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