import {z} from 'zod'

export type GetApiCouponsArgs = {page?: number | undefined, items?: number | undefined};

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

export const couponDiscountMode = z.enum(["code", "bank", "custom_bins"]);

export const couponDuration = z.enum(["once", "forever"]);

export const coupon = z.object({id: z.string().optional(), name: z.string().optional(), discount_mode: couponDiscountMode.optional(), display_name: z.string().nullable().optional(), amount_off_in_cents: z.number().int().nullable().optional(), percent_off: z.number().nullable().optional(), automatically_applies: z.boolean().optional(), max_redemptions: z.number().int().nullable().optional(), times_redeemed: z.number().int().optional(), currency: z.string().nullable().optional(), duration: couponDuration.optional(), expires_at: z.string().nullable().optional(), status: z.string().optional()});

export const getApiCouponsResponse = z.array(coupon);

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
};

/**
 * Listar cupones
 * 
 * GET /coupons
 */
export const getApiCoupons = async (args: GetApiCouponsArgs, options?: GetApiCouponsOptions) => {
const {baseUrl = "https://app.recurrente.com/api", fetch: fetchFn = fetch, secretKey} = options ?? {}

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

if (args.page != null) query.append("page", String(args.page))
if (args.items != null) query.append("items", String(args.items))
if (secretKey !== undefined) headers.set("X-SECRET-KEY", secretKey)

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