/*
    Copyright 2010 MCSharp team (Modified for use with MCZall/MCLawl/MCGalaxy)
    
    Dual-licensed under the Educational Community License, Version 2.0 and
    the GNU General Public License, Version 3 (the "Licenses"); you may
    not use this file except in compliance with the Licenses. You may
    obtain a copy of the Licenses at
    
    http://www.opensource.org/licenses/ecl2.php
    http://www.gnu.org/licenses/gpl-3.0.html
    
    Unless required by applicable law or agreed to in writing,
    software distributed under the Licenses are distributed on an "AS IS"
    BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
    or implied. See the Licenses for the specific language governing
    permissions and limitations under the Licenses.
 */
using System;
using System.IO;
using System.Reflection;
using System.Threading;
using MCGalaxy.UI;

namespace MCGalaxy.Cli {
    public static class CLI {

        // This is a different class to Program.cs, because the GUI project also
        // references this file, and we can't have duplicate Main methods
        public static void RunCLI() {
            if (!File.Exists("MCGalaxy_.dll")) {
                Console.WriteLine("Cannot start server as MCGalaxy_.dll is missing from " + Environment.CurrentDirectory);
                Console.WriteLine("Download from " + Updater.UploadsURL);
                Console.WriteLine("Press any key to exit...");
                Console.ReadKey(true);
                return;
            }
            // separate method, in case MCGalaxy_.dll is missing
            StartCLI();
        }
        
        static void StartCLI() {
            FileLogger.Init();
            Server.RestartPath = Path.GetFileName(Assembly.GetEntryAssembly().Location);
            AppDomain.CurrentDomain.UnhandledException += GlobalExHandler;
            
            try {
                Logger.LogHandler += LogMessage;
                Updater.NewerVersionDetected += LogNewerVersionDetected;
                
                Server.Start();
                Console.Title = Server.Config.Name + " - " + Server.SoftwareNameVersioned;
                Console.CancelKeyPress += OnCancelKeyPress;
                ConsoleLoop();
            } catch (Exception e) {
                Logger.LogError(e);
                FileLogger.Flush(null);
            }
        }
        
        static void OnCancelKeyPress(object sender, ConsoleCancelEventArgs e) {
            switch (e.SpecialKey) {
                case ConsoleSpecialKey.ControlBreak:
                    // Cannot set e.Cancel for this one
                    Write("&e-- Server shutdown (Ctrl+Break) --");
                    Thread stopThread = Server.Stop(false, Server.Config.DefaultShutdownMessage);
                    stopThread.Join();
                    break;
                    
                case ConsoleSpecialKey.ControlC:
                    e.Cancel = true;
                    Write("&e-- Server shutdown (Ctrl+C) --" );
                    Server.Stop(false, Server.Config.DefaultShutdownMessage);
                    break;
            }
        }
        
        public static void LogAndRestart(Exception ex) {
            Logger.LogError(ex);
            FileLogger.Flush(null);
            
            Thread.Sleep(500);
            if (Server.Config.restartOnError) {
                Thread stopThread = Server.Stop(true, "Server restart - unhandled error");
                stopThread.Join();
            }
        }
        
        static void GlobalExHandler(object sender, UnhandledExceptionEventArgs e) {
            LogAndRestart((Exception)e.ExceptionObject);
        }

        static void LogMessage(LogType type, string message) {
            if (!Server.Config.ConsoleLogging[(int)type]) return;
            
            switch (type) {
                case LogType.Error:
                    Write("!!!Error! See " + FileLogger.ErrorLogPath + " for more information.");
                    break;
                case LogType.BackgroundActivity:
                    break;
                default:
                    string now = DateTime.Now.ToString("(HH:mm:ss) ");
                    Write(now + message);
                    break;
            }
        }

        static void LogNewerVersionDetected(object sender, EventArgs e) {
            Write("&cMCGalaxy update available! Update by replacing with the files from " + Updater.UploadsURL);
        }

        static void ConsoleLoop() {
            int eofs = 0;
            while (true) {
                try {
                    string msg = Console.ReadLine();
                    // null msg is triggered in two cases:
                    //   a) when pressing Ctrl+C to shutdown CLI on Windows
                    //   b) underlying terminal provides a bogus EOF
                    // b) actually happens very rarely (e.g. a few times on startup with wine mono),
                    // so ignore the first few EOFs to workaround this case
                    if (msg == null) {
                        eofs++;
                        if (eofs >= 15) { Write("&e** EOF, console no longer accepts input **"); break; }
                        continue;
                    }
                    
                    msg = msg.Trim();
                    if (msg == "/") {
                        UIHelpers.RepeatCommand();
                    } else if (msg.Length > 0 && msg[0] == '/') {
                        UIHelpers.HandleCommand(msg.Substring(1));
                    } else {
                        UIHelpers.HandleChat(msg);
                    }
                } catch (Exception ex) {
                    // ArgumentException is raised on Mono when you type a message into a large CLI window,
                    // resize the CLI window to be smaller, and try to backspace when the message is biger
                    // than the smaller resized CLI window
                    Logger.LogError(ex);
                }
            }
        }
        
        static void Write(string message) {
            int index = 0;
            char col = 'S';
            message = UIHelpers.Format(message);
            
            while (index < message.Length) {
                char curCol = col;
                string part = UIHelpers.OutputPart(ref col, ref index, message);
                if (part.Length > 0) {
                    Console.ForegroundColor = GetConsoleCol(curCol);
                    Console.Write(part);
                }
            }
            
            Console.ForegroundColor = ConsoleColor.White;
            Console.WriteLine();
        }

        static ConsoleColor GetConsoleCol(char c) {
            if (c == 'S') return ConsoleColor.White;
            Colors.Map(ref c);
            
            switch (c) {
                    case '0': return ConsoleColor.Black;
                    case '1': return ConsoleColor.DarkBlue;
                    case '2': return ConsoleColor.DarkGreen;
                    case '3': return ConsoleColor.DarkCyan;
                    case '4': return ConsoleColor.DarkRed;
                    case '5': return ConsoleColor.DarkMagenta;
                    case '6': return ConsoleColor.DarkYellow;
                    case '7': return ConsoleColor.Gray;
                    case '8': return ConsoleColor.DarkGray;
                    case '9': return ConsoleColor.Blue;
                    case 'a': return ConsoleColor.Green;
                    case 'b': return ConsoleColor.Cyan;
                    case 'c': return ConsoleColor.Red;
                    case 'd': return ConsoleColor.Magenta;
                    case 'e': return ConsoleColor.Yellow;
                    case 'f': return ConsoleColor.White;
                    
                default:
                    if (!Colors.IsDefined(c)) return ConsoleColor.White;
                    return GetConsoleCol(Colors.Get(c).Fallback);
            }
        }
    }
}