using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Identity.Data;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.AspNetCore.SignalR;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Caching.Memory;
using StackExchange.Redis;
using System.Diagnostics;
using System.Security.Cryptography.Xml;
using WebAppServer1.ApplicationDbContext;
using WebAppServer1.Authentication;
using WebAppServer1.Models;
using WebAppServer1.Tool;

namespace WebAppServer1.Chat
{
    public class Chat : Hub
    {

        private readonly ILogger<Chat> logger;
        private readonly IConnectionMultiplexer _redis;
        private readonly AppDbContext pgSql;
        private readonly TokenService jwtService;
      

        public Chat(ILogger<Chat> _logger, IConnectionMultiplexer redis, AppDbContext _pgsql,TokenService _jwtService)
        {
            logger = _logger;
            _redis = redis;
            pgSql = _pgsql;
            jwtService = _jwtService;
        }

        //wss子端点API

        //在线事件
        public override async Task OnConnectedAsync()
        {
            var db = _redis.GetDatabase();
            await db.SetAddAsync("AllConnections", Context.ConnectionId);
            await BroadcastOnlineCount();
            Console.WriteLine("在线id:"+Context.UserIdentifier);
            if (Context.UserIdentifier != null)
            {
                int userId = int.Parse(Context.UserIdentifier!);
                var update = await pgSql.Users.FindAsync(userId);
                if (update != null)
                {
                    update.IsOnline = true;
                    pgSql.Update(update);
                    await pgSql.SaveChangesAsync();
                }
                List<int> friends = await pgSql.Friends.Where(f => f.Status == FriendStatus.Accepted &&
                           (f.UserId == userId || f.FriendId == userId)).Select
                           (f => f.UserId == userId ? f.FriendId : f.UserId).ToListAsync();
                var friendIds = friends.Select(id => id.ToString()).ToList();
                await Clients.Users(friendIds).SendAsync("UserStatusChanged", userId, true);
            }
            await base.OnConnectedAsync();
        }


        //掉线事件
        public override async Task OnDisconnectedAsync(Exception? exception)
        {
            var db = _redis.GetDatabase();
            await db.SetRemoveAsync("AllConnections", Context.ConnectionId);
            // 遍历所有群组，移除该连接
            var server = _redis.GetServer(_redis.GetEndPoints().First());
            foreach (var key in server.Keys(pattern: "Group:*"))
            {
                await db.SetRemoveAsync(key, Context.ConnectionId);
                var groupName = key.ToString().Replace("Group:", "");
                await BroadcastGroupCount(groupName);
            }
            await BroadcastOnlineCount();

            Console.WriteLine("掉线id:" + Context.UserIdentifier);
            if (Context.UserIdentifier != null)
            {
                int userId = int.Parse(Context.UserIdentifier!);
                var update = await pgSql.Users.FindAsync(userId);
                if (update != null)
                {
                    update.IsOnline = false;
                    pgSql.Update(update);
                    await pgSql.SaveChangesAsync();
                }
                List<int> friends = await pgSql.Friends.Where(f => f.Status == FriendStatus.Accepted &&
                           (f.UserId == userId || f.FriendId == userId)).Select
                           (f => f.UserId == userId ? f.FriendId : f.UserId).ToListAsync();
                var friendIds = friends.Select(id => id.ToString()).ToList();
                await Clients.Users(friendIds).SendAsync("UserStatusChanged", userId, false);
            }


            await base.OnDisconnectedAsync(exception);
        }

        //简单广播消息
        [Authorize]
        public async Task SendMessage(string user, string message)
        {
            logger.LogWarning("广播消息");
            //测试发送
            var exuser = Context.User?.Identity?.Name ?? "匿名";
            await Clients.All.SendAsync("ReceiveMessage", exuser, message);
        }

        //群聊分组消息
        public async Task JoinGroup(string groupName)
        {
            var db = _redis.GetDatabase();
            await Groups.AddToGroupAsync(Context.ConnectionId, groupName);
            await db.SetAddAsync($"Group:{groupName}", Context.ConnectionId);
            await BroadcastGroupCount(groupName);

            logger.LogWarning($"用户: {Context.ConnectionId}加入了{groupName}群组!");
            await Clients.Group(groupName).SendAsync("ReceiveMessage", groupName, "系统", $"{Context.ConnectionId} 加入了群组");
        }

        public async Task LeaveGroup(string groupName)
        {
            var db = _redis.GetDatabase();
            await Groups.RemoveFromGroupAsync(Context.ConnectionId, groupName);
            await db.SetRemoveAsync($"Group:{groupName}", Context.ConnectionId);
            await BroadcastGroupCount(groupName);
            logger.LogInformation($"用户{Context.ConnectionId}---离开了---{groupName}群组");
            await Clients.Group(groupName).SendAsync("ReceiveMessage",groupName, "系统", $"{Context.ConnectionId} 离开了群聊 {groupName}");
        }
        [Authorize]
        public async Task SendMessageToGroup(string groupName, string user, string message)
        {
            logger.LogInformation($"用户{user}发来的的消息:{message}");
            await Clients.Group(groupName).SendAsync("ReceiveMessage", groupName, user, message);
        }

        //获取聊天记录
        [Authorize]
        public async Task<List<ChatMessageDto>> GetChatRecord(int friendId)
        {
            var exfriendId = await pgSql.Users.FindAsync(friendId);
            if (exfriendId == null) return new List<ChatMessageDto>();
            //if (Context.UserIdentifier == null)
            var userId = int.Parse(Context.UserIdentifier!);
            return await pgSql.Messages
                .Where(a => (a.SenderId == userId && a.ReceiverId == friendId) ||
                (a.SenderId == friendId && a.ReceiverId == userId))
                .OrderBy(f => f.Id)
                .Select(f => new ChatMessageDto
                {
                    MessageId = f.Id,
                    Message = f.Content,
                    IsRead = f.IsRead,
                    SenderId = f.SenderId,
                    ReceiverId = f.ReceiverId,
                    IsMine = f.SenderId == userId
                })
                .ToListAsync();
        }


        //发送已读回执
        public async Task SendReadReceipt(int messageId)
        {
            var update = await pgSql.Messages.FindAsync(messageId);
            if (update == null) return;

            update.IsRead = true;
            pgSql.Messages.Update(update);
            await pgSql.SaveChangesAsync();

            // 通知消息发送者该消息已读
            await Clients.User(update.SenderId.ToString())
                .SendAsync("SendReadReceipt", messageId);
        }


        //发送私聊消息
        [Authorize]
        public async Task SendPrivateMessage(string friendId, string message)
        {

            int intFriendId = int.Parse(friendId);
            int intUserId = int.Parse(Context.UserIdentifier!);
            var receiver = await pgSql.Users.FindAsync(intFriendId);
            if (receiver == null) return;
            var sender = await pgSql.Users.FindAsync(intUserId);
            if (sender == null) return;
            bool isfriend = await pgSql.Friends.Where
            (a => (a.UserId == intUserId && a.FriendId == intFriendId &&a.Status == FriendStatus.Accepted) || 
            (a.UserId == intFriendId && a.FriendId == intUserId && a.Status == FriendStatus.Accepted)).AnyAsync();
            if (!isfriend)
            {
                await Clients.Caller.SendAsync("SendPrivateMessage", new ChatMessageDto
                {
                    IsMine = true,
                    Message = "双方不是朋友关系,暂时无法发送消息,请添加好友后再发送消息!",
                    SenderId = intUserId,
                    ReceiverId = receiver.Id
                });
                return;
            }

            var newMessage = new Message
            {
                SenderId = intUserId,
                ReceiverId = receiver.Id,
                Content = message,
                CreatedAt = DateTime.UtcNow,
                MessageType = MessageType.Text,
                IsDeleted = false,
                IsRead = false
            };
            pgSql.Messages.Add(newMessage);
            await pgSql.SaveChangesAsync();

            // 发给接收者
            await Clients.User(friendId).SendAsync("SendPrivateMessage",new ChatMessageDto
            {
                IsMine = false,
                Message = message,
                SenderId = intUserId,
                ReceiverId = receiver.Id,
                MessageId = newMessage.Id,
                Nickname = sender.Nickname,
                AvatarUrl = sender.AvatarUrl,
            });

            // 同时回给发送者，保证前端立即显示
            await Clients.Caller.SendAsync("SendPrivateMessage", new ChatMessageDto
            {
                IsMine = true,
                Message = message,
                SenderId = int.Parse(Context.UserIdentifier!),
                ReceiverId = receiver.Id,
                MessageId = newMessage.Id,
                Nickname = receiver.Nickname,
                AvatarUrl = receiver.AvatarUrl
            });
        }


        //添加好友申请
        public async Task<bool> AddFriend(int userId)
        {
            var senderId = int.Parse(Context.UserIdentifier!);
            var exuser = await pgSql.Friends.Where(a => a.UserId == userId && a.FriendId == senderId || 
            (a.FriendId == userId && a.UserId == senderId))
                .AnyAsync();
            Console.WriteLine("测试结果:"+exuser);
            if (exuser) return false;
            pgSql.Friends.Add(new Friend
            {
                UserId = senderId,
                FriendId = userId,
                CreatedAt = DateTime.UtcNow,
                Status = FriendStatus.Accepted
            });
            await pgSql.SaveChangesAsync();
            return true;
        }

        //获取好友列表
        public async Task<List<FriendsResultResponse>> GetFriendsAsync(int userId)
        {
            var friends = await pgSql.Friends
                .Where(f => f.Status == FriendStatus.Accepted &&
                           (f.UserId == userId || f.FriendId == userId))
                .Select(f => f.UserId == userId
                    ? new FriendsResultResponse
                    {
                        Id = f.FriendUser.Id,
                        Nickname = f.FriendUser.Nickname,
                        Username = f.FriendUser.Username,
                        Signature = f.FriendUser.Signature,
                        AvatarUrl = f.FriendUser.AvatarUrl,
                        IsOnline = f.FriendUser.IsOnline
                    }
                    : new FriendsResultResponse
                    {
                        Id = f.User.Id,
                        Nickname = f.User.Nickname,
                        Username = f.User.Username,
                        Signature = f.User.Signature,
                        AvatarUrl = f.User.AvatarUrl,
                        IsOnline = f.User.IsOnline
                    })
                .ToListAsync();

            return friends;
        }

        //搜索好友
        public async Task<object> SearchFriends(string username)
        {
            User? user = null;

            if (int.TryParse(username, out int userId))
            {
                user = await pgSql.Users.FindAsync(userId);
                Console.WriteLine("按 ID 查询: " + userId);
            }
            if (user == null)
            {
                user = await pgSql.Users.FirstOrDefaultAsync(a => a.Username == username);
            }
            return user == null
                ? new { success = false }
                : new
                {
                    success = true,
                    userid = user.Id,
                    username = user.Username,
                    nickname = user.Nickname,
                    avatarurl = user.AvatarUrl,
                    signature = user.Signature,
                    isonline = user.IsOnline
                };
        }

        //获取用户表单测试
        public async Task<List<object>> GetFormData()
        {
            var users = await pgSql.Users
                .Select(u => new {
                    Id = u.Id,
                    Name = u.Username,
                    Password = u.PasswordHash,
                    CreatedDate = u.CreatedAt,
                    LastModifiedDate = u.LastActive
                })
                .ToListAsync();

            return users.Cast<object>().ToList();
        }


        //刷新Token
        // 刷新 Token
        public async Task RefreshAccessToken(string refreshToken)
        {
            var token = await pgSql.Tokens.FirstOrDefaultAsync(t => t.RefreshToken == refreshToken);

            if (token == null || token.IsRevoked || token.ExpiresAt < DateTime.UtcNow)
            {
                await Clients.Caller.SendAsync("RefreshFailed", "Refresh token invalid or expired");
                return;
            }

            var newAccessToken = jwtService.GenerateAccessToken(token.UserName, token.UserId);
            var newRefreshToken = await jwtService.GenerateRefreshToken(token.UserId, token.UserName);

            token.IsRevoked = true;
            await pgSql.SaveChangesAsync();

            await Clients.Caller.SendAsync("ReceiveNewAccessToken", newAccessToken, newRefreshToken);
        }

        //登录认证
        public async Task<LoginResultResponse> LoginAuthentication(string username, string password, string ua)
        {
            var user = await pgSql.Users.FirstOrDefaultAsync(a => a.Username == username && a.PasswordHash == password);
            if (user == null)
            {
                //await Clients.Client(Context.ConnectionId).SendAsync("LoginResult",false,"用户名或密码错误!");
                return new LoginResultResponse { Success = false }; 
            }
            if (user == null) { return new LoginResultResponse { Success = false }; }
            var accessToken = jwtService.GenerateAccessToken(user.Username,user.Id);
            var refreshToken = await jwtService.GenerateRefreshToken(user.Id, username);
            //await Clients.Client(Context.ConnectionId).SendAsync("LoginResult", true, accessToken, refreshToken);
            logger.LogInformation($"用户:{username}正在进行登录认证!密码:{password}===accessToken:{accessToken}");
            var ip = Context.GetHttpContext()?.Connection?.RemoteIpAddress?.ToString();
            if (ip == null ) { return new LoginResultResponse { Success = false }; }
            pgSql.LoginRecords.Add(new LoginRecord
            {
                UserId = user.Id,
                LoginTime = DateTime.UtcNow,
                IpAddress = ip,
                DeviceInfo = ua,
                IsSuccess = true
            });
            await pgSql.SaveChangesAsync();
            return new LoginResultResponse 
            {
                Success = true,
                AccessToken = accessToken,
                RefreshToken = refreshToken,
                Nickname = user.Nickname,
                Id = user.Id,
                IsOnline = true,
                AvatarUrl = user.AvatarUrl,
                Signature = user.Signature
            };
        }
        //新用户注册
        public async Task<object> Register()
        {  
            var newUser = new User
            {
                Username = "user_" + Guid.NewGuid().ToString("N").Substring(0, 8),
                Nickname = GenerateTool.GenerateRandomNickname(),
                PasswordHash = GenerateTool.GeneratePassword(),
                Signature = GenerateTool.GenerateRandomSignature(),
                AvatarUrl = GenerateTool.GenerateRandomAvatarUrl(),
                CreatedAt = DateTime.UtcNow,
                LastActive = DateTime.UtcNow
            };
            pgSql.Add(newUser);
            await pgSql.SaveChangesAsync();
            logger.LogInformation($"新用户:{newUser.Username}正在进行登录注册操作!密码:{newUser.Nickname}");
            return new 
            {
                Username = newUser.Username,
                Password = newUser.PasswordHash,
                Success = true
            };
            
        }

        //统计在线人数
        private async Task BroadcastOnlineCount()
        {
            var db = _redis.GetDatabase();
            var count = await db.SetLengthAsync("AllConnections");
            await Clients.All.SendAsync("OnlineCount", count);
        }

        //统计群组在线人数
        private async Task BroadcastGroupCount(string groupName)
        {
            var db = _redis.GetDatabase();
            var count = await db.SetLengthAsync($"Group:{groupName}");
            await Clients.Group(groupName).SendAsync("GroupCount", groupName, count);
        }


    }
}