import {z} from 'zod'

export type GetApiShoppingFlightDatesArgs = {origin: string, destination: string, departureDate?: string | undefined, oneWay?: boolean | undefined, duration?: string | undefined, nonStop?: boolean | undefined, maxPrice?: number | undefined, viewBy?: ('DATE' | 'DURATION' | 'WEEK') | undefined};

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

export const price = z.object({total: z.string().optional()});

export const flightDate = z.object({type: z.string().optional(), origin: z.string().optional(), destination: z.string().optional(), departureDate: z.string().optional(), returnDate: z.string().optional(), price: price.optional(), links: z.object({flightDestinations: z.string().optional(), flightOffers: z.string().optional()}).optional()});

export const currencyDictionary = z.unknown();

export const locationDictionary = z.unknown();

export const dictionaries = z.object({currencies: currencyDictionary.optional(), locations: locationDictionary.optional()});

export const links = z.object({self: z.string().optional()});

export const defaults = z.object({departureDate: z.string().optional(), oneWay: z.boolean().optional(), duration: z.string().optional(), nonStop: z.boolean().optional(), viewBy: z.enum(["DATE", "DURATION", "WEEK"]).optional()});

export const meta = z.object({currency: z.string().optional(), links: links.optional(), defaults: defaults.optional()});

export const issue = z.object({status: z.number().int().optional(), code: z.number().int().optional(), title: z.string().optional(), detail: z.string().optional(), source: z.object({pointer: z.string().optional(), parameter: z.string().optional(), example: z.string().optional()}).optional()});

export const flightDates = z.object({data: z.array(flightDate).optional(), dictionaries: dictionaries.optional(), meta: meta.optional(), warnings: z.array(issue).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
};

/**
 * Find the cheapest flight dates from an origin to a destination.
 * 
 * GET /shopping/flight-dates
 */
export const getApiShoppingFlightDates = async (args: GetApiShoppingFlightDatesArgs, options?: GetApiShoppingFlightDatesOptions) => {
const {baseUrl = "https://test.api.amadeus.com/v1", fetch: fetchFn = fetch} = options ?? {}

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

if (args.origin != null) query.append("origin", String(args.origin))
if (args.destination != null) query.append("destination", String(args.destination))
if (args.departureDate != null) query.append("departureDate", String(args.departureDate))
if (args.oneWay != null) query.append("oneWay", String(args.oneWay))
if (args.duration != null) query.append("duration", String(args.duration))
if (args.nonStop != null) query.append("nonStop", String(args.nonStop))
if (args.maxPrice != null) query.append("maxPrice", String(args.maxPrice))
if (args.viewBy != null) query.append("viewBy", String(args.viewBy))

const url = `${baseUrl.replace(/\/+$/, '')}/shopping/flight-dates${query.size > 0 ? `?${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(flightDates, await res.json())
};