// Simple notification storage using localStorage
export interface NotificationRequest {
  id: string;
  libraryName: string;
  passTypes: ('Pass Only' | 'Backpack Only' | 'Both')[];
  email?: string; // Optional for future email notifications
  createdAt: string;
  lastChecked?: string;
}

export class NotificationManager {
  private static STORAGE_KEY = 'park-pass-notifications';

  static getNotifications(): NotificationRequest[] {
    if (typeof window === 'undefined') return [];
    try {
      const stored = localStorage.getItem(this.STORAGE_KEY);
      return stored ? JSON.parse(stored) : [];
    } catch {
      return [];
    }
  }

  static addNotification(request: Omit<NotificationRequest, 'id' | 'createdAt'>): NotificationRequest {
    const newRequest: NotificationRequest = {
      ...request,
      id: Date.now().toString() + Math.random().toString(36).substr(2, 9),
      createdAt: new Date().toISOString(),
    };

    const notifications = this.getNotifications();
    notifications.push(newRequest);
    
    if (typeof window !== 'undefined') {
      localStorage.setItem(this.STORAGE_KEY, JSON.stringify(notifications));
    }
    
    return newRequest;
  }

  static removeNotification(id: string): void {
    const notifications = this.getNotifications().filter(n => n.id !== id);
    if (typeof window !== 'undefined') {
      localStorage.setItem(this.STORAGE_KEY, JSON.stringify(notifications));
    }
  }

  static updateLastChecked(id: string): void {
    const notifications = this.getNotifications();
    const notification = notifications.find(n => n.id === id);
    if (notification) {
      notification.lastChecked = new Date().toISOString();
      if (typeof window !== 'undefined') {
        localStorage.setItem(this.STORAGE_KEY, JSON.stringify(notifications));
      }
    }
  }
}

// Geolocation utilities
export function calculateDistance(lat1: number, lng1: number, lat2: number, lng2: number): number {
  const R = 3959; // Earth's radius in miles
  const dLat = (lat2 - lat1) * Math.PI / 180;
  const dLng = (lng2 - lng1) * Math.PI / 180;
  const a = Math.sin(dLat / 2) * Math.sin(dLat / 2) +
    Math.cos(lat1 * Math.PI / 180) * Math.cos(lat2 * Math.PI / 180) *
    Math.sin(dLng / 2) * Math.sin(dLng / 2);
  const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
  return R * c;
}

export async function getCurrentLocation(): Promise<{ lat: number; lng: number } | null> {
  return new Promise((resolve) => {
    if (!navigator.geolocation) {
      resolve(null);
      return;
    }

    navigator.geolocation.getCurrentPosition(
      (position) => {
        resolve({
          lat: position.coords.latitude,
          lng: position.coords.longitude,
        });
      },
      () => {
        resolve(null);
      },
      { timeout: 10000 }
    );
  });
}

// Web Push Notification utilities
export class WebPushManager {
  static async requestPermission(): Promise<boolean> {
    if (!('Notification' in window)) {
      console.log('This browser does not support notifications');
      return false;
    }

    if (Notification.permission === 'granted') {
      return true;
    }

    if (Notification.permission === 'denied') {
      return false;
    }

    const permission = await Notification.requestPermission();
    return permission === 'granted';
  }

  static async showNotification(title: string, body: string, options?: NotificationOptions): Promise<void> {
    if (!await this.requestPermission()) {
      console.log('Notification permission denied');
      return;
    }

    new Notification(title, {
      body,
      icon: '/favicon.ico',
      badge: '/favicon.ico',
      tag: 'park-pass-notification',
      requireInteraction: true,
      ...options
    });
  }

  static isSupported(): boolean {
    return 'Notification' in window;
  }

  static getPermissionStatus(): NotificationPermission {
    return Notification.permission;
  }
}

// Zip code to coordinates lookup (San Diego area zip codes)
const ZIP_COORDINATES: Record<string, { lat: number; lng: number; area: string }> = {
  // Central San Diego
  '92101': { lat: 32.7157, lng: -117.1611, area: 'Downtown' },
  '92102': { lat: 32.7081, lng: -117.1367, area: 'Golden Hill' },
  '92103': { lat: 32.7441, lng: -117.1739, area: 'Hillcrest' },
  '92104': { lat: 32.7489, lng: -117.1364, area: 'Normal Heights' },
  '92105': { lat: 32.7089, lng: -117.1242, area: 'City Heights' },
  '92106': { lat: 32.7330, lng: -117.1430, area: 'Point Loma' },
  '92107': { lat: 32.7572, lng: -117.2528, area: 'Ocean Beach' },
  '92108': { lat: 32.7678, lng: -117.1189, area: 'Mission Valley' },
  '92109': { lat: 32.7889, lng: -117.2306, area: 'Pacific Beach' },
  '92110': { lat: 32.7742, lng: -117.1936, area: 'Mission Bay' },
  '92111': { lat: 32.7714, lng: -117.1789, area: 'Linda Vista' },
  '92113': { lat: 32.6781, lng: -117.0200, area: 'Skyline' },
  '92114': { lat: 32.7030, lng: -117.1289, area: 'Logan Heights' },
  '92115': { lat: 32.7328, lng: -117.1461, area: 'Oak Park' },
  '92116': { lat: 32.7644, lng: -117.1164, area: 'Kensington' },
  '92117': { lat: 32.8328, lng: -117.2050, area: 'Clairemont' },
  '92118': { lat: 32.6100, lng: -117.0842, area: 'Coronado' },
  '92119': { lat: 32.7482, lng: -117.0704, area: 'College Area' },
  '92120': { lat: 32.7678, lng: -117.0731, area: 'Del Cerro' },
  '92121': { lat: 32.8797, lng: -117.2072, area: 'Sorrento Valley' },
  '92122': { lat: 32.8544, lng: -117.2144, area: 'University City' },
  '92123': { lat: 32.8100, lng: -117.1350, area: 'Serra Mesa' },
  '92124': { lat: 32.8086, lng: -117.0547, area: 'Tierrasanta' },
  '92126': { lat: 32.8831, lng: -117.1558, area: 'Mira Mesa' },
  '92127': { lat: 32.9581, lng: -117.1089, area: 'Rancho Penasquitos' },
  '92128': { lat: 33.0200, lng: -117.1156, area: 'Rancho Bernardo' },
  '92129': { lat: 32.9584, lng: -117.1253, area: 'Rancho Penasquitos' },
  '92130': { lat: 32.9340, lng: -117.2340, area: 'Carmel Valley' },
  '92131': { lat: 32.9286, lng: -117.1311, area: 'Carmel Mountain' },
  '92132': { lat: 32.6747, lng: -117.0742, area: 'Paradise Hills' },
  '92154': { lat: 32.5592, lng: -117.0431, area: 'San Ysidro' },
  '92173': { lat: 32.6400, lng: -117.0200, area: 'San Diego East' },
};

export function getCoordinatesFromZip(zipCode: string): { lat: number; lng: number; area: string } | null {
  return ZIP_COORDINATES[zipCode] || null;
}

export function isValidSanDiegoZip(zipCode: string): boolean {
  return zipCode in ZIP_COORDINATES;
}