import {z} from 'zod'

export type SubscriptionType = 'Events' | 'CalendarEvents' | 'SyncStatus' | 'DailyHabit' | 'OneOnOne' | 'Task' | 'GtdTaskCache' | 'AssistCompleted' | 'AssistPlanned' | 'NewSubscription' | 'Moment' | 'Quest' | 'ProductUsage' | 'User' | 'Team' | 'SchedulingLink' | 'Analytics' | 'SmartMeeting' | 'SmartHabit' | 'Unsubscribe' | 'AssistantInteraction' | 'UserReset' | 'PipelineMigration' | 'ProactiveGtd' | 'ActionItemCreation' | 'AssistMigration' | 'AssistDowngrade' | 'MeetingHub';

export type Subscription = {subscriptionType?: SubscriptionType | undefined};

export type SubscribeAction = {subscription?: Subscription | undefined, subscriptionId?: string | undefined};

export type CreateApiWsSubscribeArgs = {connectionId: string, body: SubscribeAction};

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

export const subscriptionType = z.enum(["Events", "CalendarEvents", "SyncStatus", "DailyHabit", "OneOnOne", "Task", "GtdTaskCache", "AssistCompleted", "AssistPlanned", "NewSubscription", "Moment", "Quest", "ProductUsage", "User", "Team", "SchedulingLink", "Analytics", "SmartMeeting", "SmartHabit", "Unsubscribe", "AssistantInteraction", "UserReset", "PipelineMigration", "ProactiveGtd", "ActionItemCreation", "AssistMigration", "AssistDowngrade", "MeetingHub"]);

export const webSocketResponseEnvelope = z.object({data: z.unknown(), delete: z.boolean(), type: subscriptionType, compressed: z.boolean(), subscriptionId: z.string().nullable(), notificationKeys: z.array(z.string())});

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
};

/**
 * POST /ws/subscribe
 */
export const createApiWsSubscribe = async (args: CreateApiWsSubscribeArgs, options: CreateApiWsSubscribeOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

if (args.connectionId != null) headers.set("connectionId", String(args.connectionId))

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