import {z} from 'zod'

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

export const getApiRefugeeCampsResponse = z.object({"refugee-camps": z.array(z.object({area_type_en: z.string().optional(), area_type_gr: z.string().optional(), capacity: z.number().optional(), current_hosts: z.number().optional(), description: z.string().optional(), last_update: z.string().optional(), latitude: z.number().optional(), longtitude: z.number().optional(), name_en: z.string().optional(), name_gr: z.string().optional(), recorded_events: z.array(z.object({case_detection_week: z.string().optional(), confirmed_cases: z.number().optional(), quarantine_duration_days: z.number().optional(), samples: z.number().optional()})).optional(), region_en: z.string().optional(), region_gr: z.string().optional(), total_confirmed_cases: z.number().optional(), total_confirmed_samples: 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
};

/**
 * Recorded cases in Refugee Camps
 * 
 * GET /refugee-camps
 */
export const getApiRefugeeCamps = async (options: GetApiRefugeeCampsOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

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