import {z} from 'zod'

export type GetApiWeatherArgs = {key: string, iataCode: string};

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

export const getApiWeatherResponse = z.object({airportIcao: z.string().optional(), airportIata: z.string().optional(), airportName: z.string().optional(), latitude: z.number().optional(), longitude: z.number().optional(), currentWeather: z.object({temp: z.number().optional(), humidity: z.number().int().optional(), pressureMm: z.number().optional(), windMps: z.number().optional(), windDir: z.number().int().optional(), condition: z.string().optional(), precipitation: z.number().optional()}).optional(), forecast: z.array(z.object({timeFrom: z.string().optional(), timeTo: z.string().optional(), temp: z.number().optional(), humidity: z.number().int().optional(), pressureMm: z.number().optional(), windMps: z.number().optional(), windDir: z.number().int().optional(), condition: z.string().optional(), precipitation: z.number().optional()})).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 current weather conditions and forecasts for an airport using its IATA code.
 * 
 * GET /weather
 */
export const getApiWeather = async (args: GetApiWeatherArgs, options?: GetApiWeatherOptions) => {
const {baseUrl = "https://aviation-edge.com/v2/public", fetch: fetchFn = fetch, key} = options ?? {}

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

if (args.key != null) query.append("key", String(args.key))
if (args.iataCode != null) query.append("iataCode", String(args.iataCode))
if (key !== undefined) query.set("key", key)

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