import {z} from 'zod'

export type SubscriptionEventCreate = {event_type: 'activation' | 'purchase' | 'renewal' | 'balance_topup' | 'promocode_activation' | 'referral_link_visit' | 'promo_group_change', user_id: number, subscription_id?: (number | null) | undefined, transaction_id?: (number | null) | undefined, amount_kopeks?: (number | null) | undefined, currency?: (string | null) | undefined, message?: (string | null) | undefined, occurred_at?: (string | null) | undefined, extra?: {[key: string]: unknown} | undefined};

export type CreateApiNotificationsSubscriptionsArgs = {body: SubscriptionEventCreate};

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

export const subscriptionEventResponse = z.object({id: z.number().int(), event_type: z.string(), user_id: z.number().int(), user_full_name: z.string(), user_username: z.string().nullable().optional(), user_telegram_id: z.number().int().nullable().optional(), subscription_id: z.number().int().nullable().optional(), transaction_id: z.number().int().nullable().optional(), amount_kopeks: z.number().int().nullable().optional(), currency: z.string().nullable().optional(), message: z.string().nullable().optional(), occurred_at: z.string(), created_at: z.string(), extra: z.record(z.string(), z.unknown()).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
};

/**
 * Receive Subscription Event
 * 
 * POST /notifications/subscriptions
 */
export const createApiNotificationsSubscriptions = async (args: CreateApiNotificationsSubscriptionsArgs, options: CreateApiNotificationsSubscriptionsOptions) => {
const {baseUrl, fetch: fetchFn = fetch, APIKeyHeader} = options ?? {}

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

if (APIKeyHeader !== undefined) headers.set("X-API-Key", APIKeyHeader)

const url = `${baseUrl.replace(/\/+$/, '')}/notifications/subscriptions${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(subscriptionEventResponse, await res.json())
};