import {z} from 'zod'

export type GetApiRouteCalculateArgs = {Authorization: string, Accept: string, query: string, routeType: 'fastest' | 'shortest'};

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

export const totalSize = z.number().int();

export const pageSize = z.number().int();

export const totalPages = z.number().int();

export const currentPage = z.number().int();

export const version = z.object({obsoleteDate: z.string().nullable().optional(), resourceVersion: z.string().optional()});

export const messageWarning = z.array(z.object({type: z.string().optional(), description: z.string().optional(), id: z.string().nullable().optional(), code: z.number().int().optional(), properties: z.array(z.string()).optional()}));

export const routeObject = z.object({routeType: z.enum(["Fastest", "Shortest"]).optional(), lengthInKilometers: z.number().optional()});

export const getApiRouteCalculateResponse = z.object({totalSize: totalSize.optional(), pageSize: pageSize.optional(), totalPages: totalPages.optional(), currentPage: currentPage.optional(), version: version.optional(), messages: messageWarning.optional(), content: routeObject.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
};

/**
 * Calculates the distance for a given route
 * 
 * GET /route/calculate
 */
export const getApiRouteCalculate = async (args: GetApiRouteCalculateArgs, options?: GetApiRouteCalculateOptions) => {
const {baseUrl = "https://api.loket-acc.nl/geolocation", fetch: fetchFn = fetch} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('accept', "application/json;version=2018-01-01")

if (args.Authorization != null) headers.set("Authorization", String(args.Authorization))
if (args.Accept != null) headers.set("Accept", String(args.Accept))
if (args.query != null) query.append("query", String(args.query))
if (args.routeType != null) query.append("routeType", String(args.routeType))

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