import {z} from 'zod'

export type ISO3 = string;

export type GetApiApiV1VisaCheckArgs = {passport: ISO3, destination: ISO3, Accept?: ('application/json' | 'text/markdown') | undefined};

export type GetApiApiV1VisaCheckOptions = {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 visaCheckResponse = z.object({passport: iSO3, destination: iSO3, requirement: visaRequirement, visa_free_days: z.number().int().nullable().optional(), visa_required: z.boolean(), _hint: z.string().optional(), _upgrade_preview: z.object({documents_required: z.number().int().optional(), process_steps: z.number().int().optional(), embassy_info: z.boolean().optional(), transit_visa: z.boolean().optional(), visa_fees: z.boolean().optional(), processing_times: z.boolean().optional(), vaccinations: z.number().int().optional(), safety_advisory: z.string().optional(), health_requirements: z.boolean().optional(), remote_work_visa: z.boolean().optional(), languages: z.number().int().optional(), upgrade_url: z.string().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
};

/**
 * Lightweight yes/no visa check
 * 
 * GET /api/v1/visa/check
 * 
 * Also accepts auth: apiKeyQuery
 */
export const getApiApiV1VisaCheck = async (args: GetApiApiV1VisaCheckArgs, options?: GetApiApiV1VisaCheckOptions) => {
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.passport != null) query.append("passport", String(args.passport))
if (args.destination != null) query.append("destination", String(args.destination))
if (args.Accept != null) headers.set("Accept", String(args.Accept))
if (apiKeyHeader !== undefined) headers.set("x-api-key", apiKeyHeader)

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