import {z} from 'zod'

export type GetApiReportingCustomersArgs = {type?: ('total-customers' | 'customers-with-most-sales' | 'customers-with-most-orders' | 'customers-with-most-reviews' | 'top-customer-groups') | undefined, start?: string | undefined, end?: string | undefined, channel?: string | undefined};

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

export const adminReportingCustomers = z.object({entity: z.string().nullable().optional(), type: z.string().nullable().optional(), dateRange: z.array(z.unknown()).nullable().optional(), statistics: z.record(z.string(), z.unknown()).nullable().optional()});

export const getApiReportingCustomersResponse = z.array(adminReportingCustomers);

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
};

/**
 * Reporting — customers
 * 
 * GET /reporting/customers
 */
export const getApiReportingCustomers = async (args: GetApiReportingCustomersArgs, options?: GetApiReportingCustomersOptions) => {
const {baseUrl = "http://localhost:8000/api/admin", fetch: fetchFn = fetch, bearerAuth} = options ?? {}

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

if (args.type != null) query.append("type", String(args.type))
if (args.start != null) query.append("start", String(args.start))
if (args.end != null) query.append("end", String(args.end))
if (args.channel != null) query.append("channel", String(args.channel))
if (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

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