using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using GB5Shared.DTO.PushNotification;
using GB5Shared.DTO.Framework.Login;

namespace GB5Shared.PushNotification
{
    public interface IPushNotificationDAL
    {
        /// <summary>
        /// Saves a user’s Firebase device token
        /// </summary>
        /// <param name="loginDTO">The user’s login context and details.</param>
        /// <param name="token">The device token to save.</param>
        /// <returns>A message indicating success or failure.</returns>
        Task<string> SaveUserToken(LoginDTO loginDTO, string token);

        /// <summary>
        /// Subscribes a user’s device token to a specific Firebase topic.
        /// Example topics: “DEV”, “Payroll”, “Announcements”.
        /// </summary>
        /// <param name="token">The user’s Firebase device token.</param>
        /// <param name="topic">The topic name to subscribe the user to.</param>
        /// <returns>A message indicating subscription success or failure.</returns>
        Task<string> SubscribeUserToTopic(string token, string topic);

        /// <summary>
        /// Sends a push notification to all users subscribed to a specific Firebase topic.
        /// </summary>
        /// <param name="pushNotificationDTO">The notification data including topic, title, and body.</param>
        /// <returns>
        /// A message indicating success with the Firebase message ID, or an error message on failure.
        /// </returns>
        Task<string> SendNotificationToTopic(PushNotificationDTO pushNotificationDTO);

        /// <summary>
        /// Sends a push notification to one or multiple users based on their stored tokens.
        /// </summary>
        /// <param name="pushNotificationDTO">The notification data including user IDs, title, and body.</param>
        /// <returns>
        /// A message summarizing how many notifications were successfully sent or skipped.
        /// </returns>
        Task<string> SendNotificationToUsers(PushNotificationDTO pushNotificationDTO);
    }

    public class UserTokenCache
    {
        public string Token { get; set; }
        public DateTime Expiration { get; set; }
        public int UserId { get; set; }
        public int ServerId { get; set; }
        public string DatabaseName { get; set; }
        public long LoginEventLogId { get; set; }
    }

    public class UserKeysCache
    {
        public List<string> Keys { get; set; } = new List<string>();
    }
}