import {z} from 'zod'

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

export type ApiPoolSelector = {blockchains?: Array<string> | undefined, dexes?: Array<string> | undefined, max_volatility?: number | undefined};

export type ApiRouteRequestAdditionalData = {sender_address?: string | undefined, referral_name?: string | undefined};

export type ApiRouteRequest = {input_token: ApiTokenAddress, output_token: ApiTokenAddress, input_amount?: number | undefined, output_amount?: number | undefined, max_splits?: number | undefined, max_length?: number | undefined, pool_selector?: ApiPoolSelector | undefined, mev_protection?: boolean | undefined, additional_data?: ApiRouteRequestAdditionalData | undefined};

export type CreateApiV1RouteArgs = {body: ApiRouteRequest};

export type CreateApiV1RouteOptions = {baseUrl?: string | undefined, ApiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const apiTokenAddress = z.object({blockchain: z.string(), address: z.string()});

export const apiTokenVerification = z.enum(["whitelisted", "blacklisted", "community", "unknown"]);

export const apiTokenMetadata = z.object({name: z.string(), symbol: z.string(), decimals: z.number().int(), image_url: z.string().optional(), listed: z.boolean(), verification: apiTokenVerification});

export const apiToken = z.object({address: apiTokenAddress, metadata: apiTokenMetadata});

export const apiSwapResult = z.enum(["fully_fulfilled", "partially_fulfilled", "unavailable"]);

export const apiPoolReserves = z.array(z.number());

export const apiSwap = z.object({result: apiSwapResult, input_amount: z.number(), output_amount: z.number(), before_reserves: apiPoolReserves, after_reserves: apiPoolReserves, reason: z.string().optional(), left_amount: z.number().optional()});

export const apiRoutingStep: z.ZodType<ApiRoutingStep> = z.object({blockchain: z.string(), dex: z.string(), pool_address: z.string(), input_token: apiToken, output_token: apiToken, swap: apiSwap, recommended_gas: z.number(), average_gas: z.number(), next: z.array(z.lazy(() => apiRoutingStep)).optional()});

export const apiRoute = z.object({input_token: apiToken, output_token: apiToken, input_amount: z.number(), output_amount: z.number(), input_usd: z.number(), output_usd: z.number(), savings: z.number().optional(), left_amount: z.number().optional(), recommended_gas: z.number(), price_impact: z.number(), estimated_cashback_usd: z.number().optional(), partner_commission_ton: z.number().optional(), mev_protection_fee: z.number().optional(), paths: z.array(apiRoutingStep)});

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 the best route for the given trade pair
 * 
 * POST /v1/route
 */
export const createApiV1Route = async (args: CreateApiV1RouteArgs, options?: CreateApiV1RouteOptions) => {
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 = `${baseUrl.replace(/\/+$/, '')}/v1/route${query.size > 0 ? `?${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(apiRoute, await res.json())
};