import { storage } from '../storage';
import { eventBus } from '../routes/shared';
import { webPushService } from '../services/web-push.service';

/**
 * Sends web-push notifications about a task update to all task participants
 * who do NOT have an active SSE connection (i.e. are offline).
 *
 * Recipients = assignedTo + createdBy + all active taskUserAccess members,
 * minus the actor who triggered the event.
 */
export async function pushTaskUpdated(opts: {
  taskId: number;
  organizationId: number;
  formId: number;
  taskTitle: string;
  actorId: number;
}): Promise<void> {
  const { taskId, organizationId, formId, taskTitle, actorId } = opts;

  try {
    const candidates = new Set<number>();

    // Core fields: assignedTo / createdBy
    const task = await storage.getTask(taskId, organizationId);
    if (task) {
      if (task.assignedTo) candidates.add(task.assignedTo);
      if (task.createdBy) candidates.add(task.createdBy);
    }

    // All users who have interacted with the task (non-revoked access records)
    const accessList = await storage.getTaskUserAccess(taskId, organizationId);
    for (const entry of accessList) {
      if (!entry.revokedAt) {
        candidates.add(entry.userId);
      }
    }

    // Exclude the actor who triggered the event — they see it instantly
    candidates.delete(actorId);

    for (const uid of candidates) {
      if (!eventBus.isUserConnected(uid, organizationId)) {
        await webPushService.sendToUser(uid, organizationId, {
          title: 'Задача обновлена',
          body: taskTitle,
          icon: '/favicon.svg',
          url: `/forms/${formId}/tasks/${taskId}`,
          tag: `task-updated-${taskId}`,
        });
      }
    }
  } catch (err) {
    console.error('[WebPush] pushTaskUpdated error:', err);
  }
}