/**
 * Web Push Notification Service
 *
 * Implementation of notification service using Web Push API with service workers
 * for web/PWA builds. This is a wrapper around the existing PushNotificationPermission
 * component logic, providing a consistent interface with the native notification service.
 *
 * @author Matthew Raymer
 * @version 1.0.0
 * @since 2026-01-21
 */

import type {
  NotificationServiceInterface,
  DailyNotificationOptions,
  NotificationStatus,
  PermissionStatus,
} from "./NotificationService";
import { logger } from "@/utils/logger";

/**
 * Web Push notification implementation for web/PWA builds
 *
 * Features:
 * - Uses Web Push API with VAPID authentication
 * - Service worker-based message delivery
 * - Requires server-side push infrastructure
 * - Limited background support (browser-dependent)
 *
 * Limitations:
 * - Requires active service worker
 * - iOS: Limited to Home Screen PWAs on iOS 16.4+
 * - Android: Works in Chrome 42+
 * - Requires network connection for delivery
 *
 * @note This is currently a stub implementation that will be fully integrated
 * with the existing PushNotificationPermission.vue component logic in a
 * future update. For now, it provides the interface structure.
 */
export class WebPushNotificationService
  implements NotificationServiceInterface
{
  private readonly platformName = "web";

  /**
   * Check if Web Push is supported in the current browser
   */
  isSupported(): boolean {
    const supported =
      "serviceWorker" in navigator &&
      "PushManager" in window &&
      "Notification" in window;

    if (!supported) {
      logger.warn(
        "[WebPushNotificationService] Web Push is not supported in this browser",
      );
    }

    return supported;
  }

  /**
   * Request notification permissions via browser API
   */
  async requestPermissions(): Promise<boolean> {
    try {
      if (!this.isSupported()) {
        logger.error("[WebPushNotificationService] Web Push not supported");
        return false;
      }

      logger.debug(
        "[WebPushNotificationService] Requesting browser notification permissions",
      );

      const permission = await Notification.requestPermission();
      const granted = permission === "granted";

      logger.debug(
        "[WebPushNotificationService] Permission result:",
        permission,
      );

      return granted;
    } catch (error) {
      logger.error(
        "[WebPushNotificationService] Permission request failed:",
        error,
      );
      return false;
    }
  }

  /**
   * Check current browser notification permission status
   */
  async checkPermissions(): Promise<PermissionStatus> {
    if (!this.isSupported()) {
      return {
        granted: false,
        details: {
          notifications: false,
        },
      };
    }

    const granted = window.Notification?.permission === "granted";

    return {
      granted,
      details: {
        notifications: granted,
      },
    };
  }

  /**
   * Schedule a daily notification via Web Push
   *
   * @note This is a stub implementation. The actual scheduling will be
   * integrated with the existing PushNotificationPermission.vue component
   * and web push server infrastructure.
   *
   * @param options Notification configuration
   * @returns Promise that resolves to true if scheduling succeeded
   */
  async scheduleDailyNotification(
    options: DailyNotificationOptions,
  ): Promise<boolean> {
    try {
      logger.info("[WebPushNotificationService] Schedule requested:", {
        time: options.time,
        title: options.title,
      });

      // TODO: Integrate with existing PushNotificationPermission.vue logic
      // This will involve:
      // 1. Subscribing to push service with VAPID key
      // 2. Sending subscription to server with schedule time
      // 3. Server will send push messages at scheduled time

      logger.warn(
        "[WebPushNotificationService] Scheduling not yet implemented - use PushNotificationPermission.vue component directly",
      );

      return false;
    } catch (error) {
      logger.error("[WebPushNotificationService] Schedule failed:", error);
      return false;
    }
  }

  /**
   * Cancel daily web push notifications
   *
   * @note This is a stub implementation. Will be integrated with existing
   * web push unsubscribe logic.
   */
  async cancelDailyNotification(): Promise<void> {
    try {
      logger.info("[WebPushNotificationService] Cancel requested");

      // TODO: Integrate with existing unsubscribe logic from App.vue
      // This will involve:
      // 1. Getting current service worker subscription
      // 2. Calling subscription.unsubscribe()
      // 3. Notifying server to stop sending push messages

      logger.warn(
        "[WebPushNotificationService] Cancellation not yet implemented - use existing App.vue logic",
      );
    } catch (error) {
      logger.error("[WebPushNotificationService] Cancel failed:", error);
    }
  }

  /**
   * Get current web push notification status
   *
   * @note This is a stub implementation. Will be integrated with existing
   * settings retrieval logic.
   */
  async getStatus(): Promise<NotificationStatus> {
    try {
      // TODO: Integrate with existing settings from database
      // Check settings.notifyingNewActivityTime and settings.notifyingReminderTime

      logger.debug(
        "[WebPushNotificationService] Status check - stub implementation",
      );

      return {
        enabled: false,
        notificationType: "web-push",
      };
    } catch (error) {
      logger.error("[WebPushNotificationService] Get status failed:", error);
      return {
        enabled: false,
        notificationType: "web-push",
      };
    }
  }

  /**
   * Get platform identifier
   */
  getPlatformName(): string {
    return this.platformName;
  }
}
