import {z} from 'zod'

export type GetApiStationsSearchArgs = {apikey: string, lat: number, lng: number, rad?: number | undefined};

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

export const station = z.object({country: z.string().optional(), id: z.string(), name: z.string().optional(), brand: z.string().optional(), street: z.string().optional(), postalCode: z.string(), place: z.string().optional(), coords: z.object({lat: z.number(), lng: z.number()}), isOpen: z.boolean().optional(), closesAt: z.string().optional(), opensAt: z.string().optional(), openingTimes: z.array(z.object({days: z.array(z.enum(["mon", "tue", "wed", "thu", "fri", "sat", "sun", "hol"])).optional(), times: z.array(z.object({open: z.string().optional(), close: z.string().optional()})).optional()})).optional(), dist: z.number().optional(), fuels: z.array(z.object({category: z.enum(["diesel", "lpg", "gasoline", "cng"]), name: z.string(), price: z.number(), lastChange: z.object({timestamp: z.string(), amount: z.number()}).optional()}))});

export const stations = z.array(station);

export const response200 = z.object({apiVersion: z.string(), timestamp: z.string(), stations: stations});

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
};

/**
 * Aktuelle Kraftstoffpreise an Tankstellen im Umkreis
 * 
 * GET /stations/search
 */
export const getApiStationsSearch = async (args: GetApiStationsSearchArgs, options?: GetApiStationsSearchOptions) => {
const {baseUrl = "https://creativecommons.tankerkoenig.de/api/v4", fetch: fetchFn = fetch} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('accept', "application/json; charset=utf-8")

if (args.apikey != null) query.append("apikey", String(args.apikey))
if (args.lat != null) query.append("lat", String(args.lat))
if (args.lng != null) query.append("lng", String(args.lng))
if (args.rad != null) query.append("rad", String(args.rad))

const url = `${baseUrl.replace(/\/+$/, '')}/stations/search${query.size > 0 ? `?${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(response200, await res.json())
};