import {z} from 'zod'

export type GetApiApiV1VisaGroupArgs = {passports: string, allow?: string | undefined};

export type GetApiApiV1VisaGroupOptions = {baseUrl?: string | undefined, apiKeyHeader?: string | undefined, fetch?: typeof fetch | undefined};

export const iSO3 = z.string().min(3).max(3);

export const visaRequirement = z.enum(["visa_free", "visa_required", "e_visa", "visa_on_arrival", "eta", "no_admission"]);

export const groupDestination = z.object({destination: iSO3.optional(), group_requirement: visaRequirement.optional(), group_visa_free_days: z.number().int().nullable().optional(), by_passport: z.record(z.string(), z.object({requirement: visaRequirement.optional(), visa_free_days: z.number().int().nullable().optional()})).optional()});

export const groupResponse = z.object({passports: z.array(iSO3), allow: z.array(visaRequirement), total: z.number().int(), excluded: z.object({requirement_not_allowed: z.number().int().optional(), incomplete_data: z.number().int().optional()}).optional(), destinations: z.array(groupDestination)});

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
};

/**
 * Group trip — multi-passport intersection (Hobby+)
 * 
 * GET /api/v1/visa/group
 * 
 * Also accepts auth: apiKeyQuery
 */
export const getApiApiV1VisaGroup = async (args: GetApiApiV1VisaGroupArgs, options?: GetApiApiV1VisaGroupOptions) => {
const {baseUrl = "https://visa.orizn.app", fetch: fetchFn = fetch, apiKeyHeader} = options ?? {}

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

if (args.passports != null) query.append("passports", String(args.passports))
if (args.allow != null) query.append("allow", String(args.allow))
if (apiKeyHeader !== undefined) headers.set("x-api-key", apiKeyHeader)

const url = `${baseUrl.replace(/\/+$/, '')}/api/v1/visa/group${query.size > 0 ? `?${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(groupResponse, await res.json())
};