using System;
using System.Collections.Generic;
using Sys = Cosmos.System;

namespace CMLeonOS
{
    public class Shell
    {
        private string prompt = "/";
        private List<string> commandHistory = new List<string>();
        private FileSystem fileSystem;
        private UserSystem userSystem;

        public Shell()
        {
            fileSystem = new FileSystem();
            userSystem = new UserSystem();
        }

        public void Run()
        {
            while (true)
            {
                Console.Write(prompt);
                var input = Console.ReadLine();
                commandHistory.Add(input);
                var parts = input.Split(' ', StringSplitOptions.RemoveEmptyEntries);
                if (parts.Length > 0)
                {
                    var command = parts[0].ToLower();
                    var args = parts.Length > 1 ? string.Join(" ", parts, 1, parts.Length - 1) : "";
                    ProcessCommand(command, args);
                }
            }
        }

        private void ProcessCommand(string command, string args)
        {
            switch (command)
            {
                case "echo":
                    ProcessEcho(args);
                    break;
                case "clear":
                case "cls":
                    Console.Clear();
                    break;
                case "restart":
                    Console.WriteLine("Restarting system...");
                    Sys.Power.Reboot();
                    break;
                case "shutdown":
                    Console.WriteLine("Shutting down system...");
                    Sys.Power.Shutdown();
                    break;
                case "help":
                    Console.WriteLine("Available commands:");
                    Console.WriteLine("  echo <text>    - Display text (supports \\n for newline)");
                    Console.WriteLine("  clear/cls      - Clear the screen");
                    Console.WriteLine("  restart        - Restart the system");
                    Console.WriteLine("  shutdown       - Shutdown the system");
                    Console.WriteLine("  time           - Display current time");
                    Console.WriteLine("  date           - Display current date");
                    Console.WriteLine("  prompt <text>  - Change command prompt");
                    Console.WriteLine("  calc <expr>    - Simple calculator");
                    Console.WriteLine("  history        - Show command history");
                    Console.WriteLine("  background <hex> - Change background color");
                    Console.WriteLine("  cuitest        - Test CUI framework");
                    Console.WriteLine("  edit <file>    - Simple code editor");
                    Console.WriteLine("  ls <dir>       - List files and directories");
                    Console.WriteLine("  cd <dir>       - Change directory");
                    Console.WriteLine("  pwd            - Show current directory");
                    Console.WriteLine("  mkdir <dir>    - Create directory");
                    Console.WriteLine("  rm <file>      - Remove file");
                    Console.WriteLine("  rmdir <dir>     - Remove directory");
                    Console.WriteLine("  cat <file>     - Display file content");
                    Console.WriteLine("  echo <text> > <file> - Write text to file");
                    Console.WriteLine("  cpass          - Change password");
                    Console.WriteLine("  version        - Show OS version");
                    Console.WriteLine("  about          - Show about information");
                    Console.WriteLine("  help           - Show this help message");
                    break;
                case "time":
                    Console.WriteLine(DateTime.Now.ToString());
                    break;
                case "date":
                    Console.WriteLine(DateTime.Now.ToShortDateString());
                    break;
                case "prompt":
                    ChangePrompt(args);
                    break;
                case "calc":
                    Calculate(args);
                    break;
                case "history":
                    ShowHistory();
                    break;
                case "background":
                    ChangeBackground(args);
                    break;
                case "cuitest":
                    TestCUI();
                    break;
                case "edit":
                    EditFile(args);
                    break;
                case "ls":
                    fileSystem.ListFiles(args);
                    break;
                case "cd":
                    fileSystem.ChangeDirectory(args);
                    break;
                case "pwd":
                    Console.WriteLine(fileSystem.CurrentDirectory);
                    break;
                case "mkdir":
                    if (string.IsNullOrEmpty(args))
                    {
                        Console.WriteLine("Error: Please specify a directory name");
                    }
                    else
                    {
                        fileSystem.MakeDirectory(args);
                    }
                    break;
                case "rm":
                    if (string.IsNullOrEmpty(args))
                    {
                        Console.WriteLine("Error: Please specify a file name");
                    }
                    else
                    {
                        fileSystem.DeleteFile(args);
                    }
                    break;
                case "rmdir":
                    if (string.IsNullOrEmpty(args))
                    {
                        Console.WriteLine("Error: Please specify a directory name");
                    }
                    else
                    {
                        fileSystem.DeleteDirectory(args);
                    }
                    break;
                case "cat":
                    if (string.IsNullOrEmpty(args))
                    {
                        Console.WriteLine("Error: Please specify a file name");
                    }
                    else
                    {
                        Console.WriteLine(fileSystem.ReadFile(args));
                    }
                    break;
                case "version":
                    Console.WriteLine("CMLeonOS v1.0");
                    break;
                case "about":
                    Console.WriteLine("CMLeonOS Test Project");
                    Console.WriteLine("By LeonOS 2 Developement Team");
                    Console.WriteLine("A simple operating system built with Cosmos");
                    break;
                case "cpass":
                    userSystem.ChangePassword();
                    break;
                default:
                    Console.WriteLine($"Unknown command: {command}");
                    break;
            }
        }

        private void ProcessEcho(string args)
        {
            // 支持基本的转义字符
            var processedArgs = args.Replace("\\n", "\n");
            Console.WriteLine(processedArgs);
        }

        private void ChangePrompt(string args)
        {
            if (!string.IsNullOrEmpty(args))
            {
                prompt = args;
            }
            else
            {
                prompt = "/";
            }
        }

        private void Calculate(string expression)
        {
            try
            {
                // 简单的计算器，只支持加减乘除
                var parts = expression.Split(' ');
                if (parts.Length == 3)
                {
                    double num1 = double.Parse(parts[0]);
                    string op = parts[1];
                    double num2 = double.Parse(parts[2]);
                    double result = 0;

                    switch (op)
                    {
                        case "+":
                            result = num1 + num2;
                            break;
                        case "-":
                            result = num1 - num2;
                            break;
                        case "*":
                            result = num1 * num2;
                            break;
                        case "/":
                            if (num2 != 0)
                            {
                                result = num1 / num2;
                            }
                            else
                            {
                                Console.WriteLine("Error: Division by zero");
                                return;
                            }
                            break;
                        default:
                            Console.WriteLine("Error: Invalid operator. Use +, -, *, /");
                            return;
                    }

                    Console.WriteLine($"Result: {result}");
                }
                else
                {
                    Console.WriteLine("Error: Invalid expression. Use format: calc <num> <op> <num>");
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error: {ex.Message}");
            }
        }

        private void ShowHistory()
        {
            for (int i = 0; i < commandHistory.Count; i++)
            {
                Console.WriteLine($"{i + 1}: {commandHistory[i]}");
            }
        }

        private void ChangeBackground(string hexColor)
        {
            try
            {
                // 移除#前缀（如果有）
                hexColor = hexColor.TrimStart('#');

                // 解析16进制颜色代码
                if (hexColor.Length == 6)
                {
                    int r = Convert.ToInt32(hexColor.Substring(0, 2), 16);
                    int g = Convert.ToInt32(hexColor.Substring(2, 2), 16);
                    int b = Convert.ToInt32(hexColor.Substring(4, 2), 16);

                    // 简单的颜色映射，将RGB值映射到最接近的ConsoleColor
                    ConsoleColor color = GetClosestConsoleColor(r, g, b);
                    Console.BackgroundColor = color;
                    Console.Clear();
                    Console.WriteLine($"Background color changed to: #{hexColor}");
                }
                else
                {
                    Console.WriteLine("Error: Invalid hex color format. Use format: #RRGGBB or RRGGBB");
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error changing background color: {ex.Message}");
            }
        }

        private ConsoleColor GetClosestConsoleColor(int r, int g, int b)
        {
            // 简单的颜色映射逻辑
            // 将RGB值映射到最接近的ConsoleColor
            ConsoleColor[] colors = new ConsoleColor[]
            {
                ConsoleColor.Black,
                ConsoleColor.DarkBlue,
                ConsoleColor.DarkGreen,
                ConsoleColor.DarkCyan,
                ConsoleColor.DarkRed,
                ConsoleColor.DarkMagenta,
                ConsoleColor.DarkYellow,
                ConsoleColor.Gray,
                ConsoleColor.DarkGray,
                ConsoleColor.Blue,
                ConsoleColor.Green,
                ConsoleColor.Cyan,
                ConsoleColor.Red,
                ConsoleColor.Magenta,
                ConsoleColor.Yellow,
                ConsoleColor.White
            };
            ConsoleColor closestColor = ConsoleColor.Black;
            double smallestDistance = double.MaxValue;

            foreach (ConsoleColor color in colors)
            {
                // 为每个ConsoleColor计算RGB值
                // 这里使用简单的映射，实际效果可能不是很准确
                int cr, cg, cb;
                GetRGBFromConsoleColor(color, out cr, out cg, out cb);

                // 计算欧几里得距离
                double distance = Math.Sqrt(Math.Pow(r - cr, 2) + Math.Pow(g - cg, 2) + Math.Pow(b - cb, 2));
                if (distance < smallestDistance)
                {
                    smallestDistance = distance;
                    closestColor = color;
                }
            }

            return closestColor;
        }

        private void GetRGBFromConsoleColor(ConsoleColor color, out int r, out int g, out int b)
        {
            // 简单的ConsoleColor到RGB的映射
            switch (color)
            {
                case ConsoleColor.Black:
                    r = 0; g = 0; b = 0; break;
                case ConsoleColor.DarkBlue:
                    r = 0; g = 0; b = 128; break;
                case ConsoleColor.DarkGreen:
                    r = 0; g = 128; b = 0; break;
                case ConsoleColor.DarkCyan:
                    r = 0; g = 128; b = 128; break;
                case ConsoleColor.DarkRed:
                    r = 128; g = 0; b = 0; break;
                case ConsoleColor.DarkMagenta:
                    r = 128; g = 0; b = 128; break;
                case ConsoleColor.DarkYellow:
                    r = 128; g = 128; b = 0; break;
                case ConsoleColor.Gray:
                    r = 192; g = 192; b = 192; break;
                case ConsoleColor.DarkGray:
                    r = 128; g = 128; b = 128; break;
                case ConsoleColor.Blue:
                    r = 0; g = 0; b = 255; break;
                case ConsoleColor.Green:
                    r = 0; g = 255; b = 0; break;
                case ConsoleColor.Cyan:
                    r = 0; g = 255; b = 255; break;
                case ConsoleColor.Red:
                    r = 255; g = 0; b = 0; break;
                case ConsoleColor.Magenta:
                    r = 255; g = 0; b = 255; break;
                case ConsoleColor.Yellow:
                    r = 255; g = 255; b = 0; break;
                case ConsoleColor.White:
                    r = 255; g = 255; b = 255; break;
                default:
                    r = 0; g = 0; b = 0; break;
            }
        }

        private void TestCUI()
        {
            // 创建CUI实例
            var cui = new CUI("CMLeonOS CUI Test");
            
            // 设置状态
            cui.SetStatus("Testing CUI...");
            
            // 渲染CUI界面（只渲染顶栏）
            cui.Render();
            
            // 显示测试消息
            Console.WriteLine();
            Console.WriteLine("CUI Framework Test");
            Console.WriteLine("-------------------");
            Console.WriteLine("Testing CUI functionality...");
            Console.WriteLine();
            
            // 测试不同类型的消息
            Console.ForegroundColor = ConsoleColor.Green;
            Console.WriteLine("Success: Success message test");
            Console.ResetColor();
            
            Console.ForegroundColor = ConsoleColor.Red;
            Console.WriteLine("Error: Error message test");
            Console.ResetColor();
            
            Console.WriteLine("Normal message test");
            Console.WriteLine();
            
            // 测试用户输入
            Console.Write("Enter your name: ");
            var input = Console.ReadLine();
            Console.WriteLine();
            Console.WriteLine($"Hello, {input}!");
            Console.WriteLine();
            
            // 渲染底栏
            cui.RenderBottomBar();
            
            // 等待用户按任意键返回
            Console.WriteLine();
            Console.WriteLine("Press any key to return to shell...");
            Console.ReadKey(true);
            
            // 重置控制台
            Console.Clear();
        }

        private void EditFile(string fileName)
        {
            if (string.IsNullOrEmpty(fileName))
            {
                Console.WriteLine("Error: Please specify a file name");
                return;
            }
            
            try
            {
                var editor = new Editor(fileName, fileSystem);
                editor.Run();
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error starting editor: {ex.Message}");
            }
        }
    }
}