using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using RainOpsMini.Helpers;
using RainOpsMini.Helpers.RCON;
using RainOpsMini.Models;

namespace RainOpsMini.Services
{
    public class OnlineUserService
    {
        // Panel Users: Username -> ConnectionCount
        private ConcurrentDictionary<string, int> _panelUsers = new ConcurrentDictionary<string, int>();
        private readonly RconDataCache _rconCache;

        public OnlineUserService(RconDataCache rconCache)
        {
            _rconCache = rconCache;
        }

        public void UserConnected(string username)
        {
            if (string.IsNullOrEmpty(username)) return;
            _panelUsers.AddOrUpdate(username, 1, (k, v) => v + 1);
        }

        public void UserDisconnected(string username)
        {
            if (string.IsNullOrEmpty(username)) return;
            _panelUsers.AddOrUpdate(username, 0, (k, v) => v > 1 ? v - 1 : 0);
            
            // Clean up zeros
            if (_panelUsers.TryGetValue(username, out int count) && count <= 0)
            {
                _panelUsers.TryRemove(username, out _);
            }
        }

        public List<string> GetOnlinePanelUsers()
        {
            return _panelUsers.Where(kvp => kvp.Value > 0).Select(kvp => kvp.Key).ToList();
        }

        public List<CameramanInfo> GetOnlineCameramen()
        {
            // Priority 1: Check Current Directory (likely Project Root in Dev, or App Root in Prod)
            var configPath = Path.Combine(Directory.GetCurrentDirectory(), "SquadGame", "ServerConfig", "Admins.cfg");
            
            // Priority 2: Check Base Directory (Bin folder)
            if (!File.Exists(configPath))
            {
                configPath = Path.Combine(Environment.CurrentDirectory, "SquadGame", "ServerConfig", "Admins.cfg");
            }
            
            if (!File.Exists(configPath)) return new List<CameramanInfo>();

            // RainOpsMini.Helpers.RainOpsLog.Log($"Loading Admins.cfg from: {configPath}");

            var groupsWithCameraman = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
            var onlineCameramen = new List<CameramanInfo>();

            try
            {
                var lines = File.ReadAllLines(configPath);
                
                // 1. Identify Groups with 'cameraman' permission
                foreach (var line in lines)
                {
                    var trimLine = line.Trim();
                    if (string.IsNullOrWhiteSpace(trimLine) || trimLine.StartsWith("//") || trimLine.StartsWith("#")) continue;

                    if (trimLine.StartsWith("Group=", StringComparison.OrdinalIgnoreCase))
                    {
                        // Format: Group=GroupName:perm1,perm2...
                        var parts = trimLine.Substring(6).Split(':');
                        if (parts.Length >= 2)
                        {
                            var groupName = parts[0].Trim();
                            var perms = parts[1].Split(',').Select(p => p.Trim().ToLower()).ToHashSet();
                            
                            if (perms.Contains("cameraman"))
                            {
                                groupsWithCameraman.Add(groupName);
                            }
                        }
                    }
                }

                // 2. Identify Admins in those groups
                var definedCameramen = new List<CameramanInfo>();
                foreach (var line in lines)
                {
                    var trimLine = line.Trim();
                    if (string.IsNullOrWhiteSpace(trimLine) || trimLine.StartsWith("//") || trimLine.StartsWith("#")) continue;

                    if (trimLine.StartsWith("Admin=", StringComparison.OrdinalIgnoreCase))
                    {
                        // Format: Admin=SteamID:GroupName//Comment
                        var content = trimLine.Substring(6);
                        var parts = content.Split(':');
                        if (parts.Length >= 2)
                        {
                            var steamId = parts[0].Trim();
                            var rest = parts[1];
                            
                            // Split GroupName and Comment
                            string groupName;
                            string comment = "";
                            
                            int commentIdx = rest.IndexOf("//");
                            if (commentIdx >= 0)
                            {
                                groupName = rest.Substring(0, commentIdx).Trim();
                                comment = rest.Substring(commentIdx + 2).Trim();
                            }
                            else
                            {
                                groupName = rest.Trim();
                            }

                            if (groupsWithCameraman.Contains(groupName))
                            {
                                definedCameramen.Add(new CameramanInfo
                                {
                                    SteamId = steamId,
                                    Name = comment, // Use comment as name
                                    GroupName = groupName
                                });
                            }
                        }
                    }
                }

                // 3. Check online status
                // We use cached player list
                var currentPlayers = _rconCache.Players ?? new List<PlayerInfo>();
                // Safe dictionary creation to avoid duplicate keys exception
                var onlineSteamIds = new Dictionary<string, string>();
                foreach (var p in currentPlayers)
                {
                    if (!string.IsNullOrEmpty(p.SteamId) && !onlineSteamIds.ContainsKey(p.SteamId))
                    {
                        onlineSteamIds[p.SteamId] = p.Name;
                    }
                }

                foreach (var cam in definedCameramen)
                {
                    if (onlineSteamIds.ContainsKey(cam.SteamId))
                    {
                        cam.IsOnline = true;
                        // Optionally update name from actual player name if available
                        // cam.Name = $"{cam.Name} ({onlineSteamIds[cam.SteamId]})";
                        onlineCameramen.Add(cam);
                    }
                }
            }
            catch (Exception ex)
            {
                RainOpsLog.Log($"Error parsing Admins.cfg: {ex.Message}");
            }

            return onlineCameramen;
        }
    }

    public class CameramanInfo
    {
        public string SteamId { get; set; } = "";
        public string Name { get; set; } = "";
        public string GroupName { get; set; } = "";
        public bool IsOnline { get; set; }
    }
}