using QuestShare.Server.Models;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.Security.Cryptography;

namespace QuestShare.Server.Managers
{
    public static class ClientManager
    {
        public static string AddClient(string connectionId, ulong characterId)
        {
            using var context = new QuestShareContext();
            var token = GenerateToken();
            context.Clients.Add(new Client
            {
                ConnectionId = connectionId,
                CharacterId = characterId,
                Token = token
            });
            context.SaveChanges();
            return token;
        }
        public static void RemoveClient(string connectionId)
        {
            using var context = new QuestShareContext();
            var client = context.Clients.FirstOrDefault(c => c.ConnectionId == connectionId);
            if (client != null)
            {
                context.Clients.Remove(client);
            }
            context.SaveChanges();
        }
        public static Client? GetClient(string connectionId, string token = "")
        {
            using var context = new QuestShareContext();
            var client = context.Clients.FirstOrDefault(c => c.ConnectionId == connectionId || c.Token == token);
            if (client != null)
            {
                if (token != "" && client.Token != token)
                {
                    Log.Warning($"[ClientManager] Found a client, but tokens did not match. {token} != {client.Token}");
                    return null;
                }
                if (client.ConnectionId != connectionId)
                {
                    Log.Information($"[ClientManager] Changing connection ID from {connectionId} to {client.ConnectionId} for token {token}");
                    ChangeClientConnectionId(client.ConnectionId, connectionId);
                }
                return client;
            } else
            {
                Log.Warning($"[ClientManager] Unable to find client for {connectionId} or token {token}");
                return null;
            }
        }
        public static Client? GetClient(ulong characterId)
        {
            using var context = new QuestShareContext();
            var client = context.Clients.FirstOrDefault(c => c.CharacterId == characterId);
            if (client != null)
            {
                return client;
            }
            else
            {
                return null;
            }
        }

        public static void ChangeClientConnectionId(string oldConnectionId, string newConnectionId)
        {
            using var context = new QuestShareContext();
            var client = context.Clients.FirstOrDefault(c => c.ConnectionId == oldConnectionId);
            if (client != null)
            {
                client.ConnectionId = newConnectionId;
                context.SaveChanges();
            }
        }

        private static string GenerateToken()
        {
            var random = RandomNumberGenerator.GetHexString(32, true);
            return random;
        }
    }
}