using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using AniNIX.Shared;

namespace AniNIX.TheRaven {

    public sealed class Raven : IDisposable {

        /* These are the private globals for this instance
         * They should never be accessible outside this Raven
         */
        //These are the basic configuration information to be overwritten
        public String Host { get; private set; } //This is the Host we are connecting to. 
        public int Port { get; private set; } // This is Port to connect on
        public string Nick { get; private set; } // This is the Nickname for this Raven to use.
        private string _nickServPass; // This is the password we will send to NickServ to identify
        private string _autoSend; // This is the command we will automatically send to the Host
        private string _configFile; // This is the configuration directory. 
        private Connection _connection; //This is the socket to the Host

        public List<String> channels; //This is the list of channels to join
        public List<String> whitelist; //This is the list of admin users.
        public List<String> blacklist; // This is the list of blocked people.
        public String helpText; // This is the text to send when people ask for help -- this is configurable to allow for skinning	
        public List<String> searches; //These are the searches
        public String searchesIndex; //This is the helptext for the searches
        public List<String> magic8; //These are the strings to return like a Magic 8-ball to questions. 
        public List<String> crowFacts; //These are the possible CrowFacts
        public List<String> crowFactsSubscribers = new List<String>(); //These are the subscribers to CrowFacts
        public Dictionary<String,String> notifications = new Dictionary<String,String>(); // This is the notifications list for TheRaven.

        public Random randomSeed = new Random(); //This is our random seed

        public Dictionary<String,int> MailerCount = new Dictionary<String,int>(); // Messages may only be sent up to a maximum to the admins.

        /// <summary>
        /// Show the settings used by this Raven.
        /// </summary>
        /// <returns>A string representing this Raven</returns>
        public override string ToString() {
            StringBuilder sb = new StringBuilder();
            sb.Append("### AniNIX::TheRaven -- Running Values ###\n");
            sb.Append(String.Format("Host: {0}\n",Host));
            sb.Append(String.Format("Port: {0}\n",Port));
            sb.Append(String.Format("Nick: {0}\n",Nick));
            sb.Append("NickServPass: ****\n");
            sb.Append(String.Format("Auto: {0}\n",_autoSend));
            sb.Append(String.Format("Conf: {0}\n",_configFile));
            sb.Append(String.Format("Verbosity: {0}\n",ReportMessage.verbosity));
            return sb.ToString();
        }

        /// <summary>
        /// Read from the files in the /usr/local/etc/TheRaven directory to configure this Raven
        /// </summary>
        // TODO: This and ParseArgs may get punted into their own static class to improve readability.
        private void ConfigureSelfFromFiles() {

            String confFilePath = String.Format("/usr/local/etc/TheRaven/{0}",_configFile);

            if (!File.Exists(confFilePath)) {
                ReportMessage.Log(Verbosity.Error,"Configuration file doesn't exist.");
                return;
            }

            ReportMessage.Log(Verbosity.Always,String.Format("Reading from config file in /usr/local/etc/{0} and the global files in the same directory...",_configFile)); 
            Configure conf = new Configure(confFilePath);

            //These are locals that will be used throughout
            Dictionary<String,String> loginDefaults = conf.ReadSection("Login");
            this.Host = loginDefaults["host"];
            this.Port = Int32.Parse(loginDefaults["port"]);
            this.Nick = loginDefaults["username"];
            this._nickServPass = loginDefaults["password"];

            channels=new List<String>();
            foreach (String channel in conf.ReadSectionLines("Rooms")) {
                channels.Add(String.Format("#{0}",channel));
            }

            //Parse the lists.
            notifications = conf.ReadSection("Notifications");
            whitelist = conf.ReadSectionLines("Whitelist");
            blacklist = conf.ReadSectionLines("Blacklist");
            helpText = "Available commands are r.raven, r.magic8, r.uptime, r.heartbeat, r.msg <memo for admin>, r.d <dice test>, r.tinyurl <url>, and r.searches";
            searches = conf.ReadSectionLines("Searches");
            StringBuilder searchIndexBuilder = new StringBuilder();
            foreach (String searchLine in searches) { 
                String[] byPipe = searchLine.Split('|');
                if (byPipe.Length > 3) searchIndexBuilder.Append(String.Format("{0} <{1} search>, ",byPipe[0],byPipe[3]));
            }
            searchesIndex = searchIndexBuilder.ToString();

            //Read the globals 
            magic8 = (new Configure("/usr/local/etc/TheRaven/magic8.txt")).GetLines();
            crowFacts = (new Configure("/usr/local/etc/TheRaven/crowfacts.txt")).GetLines();
        }

        /// <summary>
        /// Parse arguments from the command line.
        /// </summary>
        //TODO: Move this to RavenConfigure and add struct for these configurations
        public void ParseArguments(String[] args) {
            if (args != null) {
                for (int i = 0; i < args.Length; i++) {
                    ReportMessage.Log(Verbosity.Verbose,String.Format("Handling Argument {0}: {1}",i,args[i]));
                    switch (args[i]) {
                        case "-n":
                            if (i < args.Length-1) Nick = args[++i];
                            break;
                        case "-h":
                            if (i < args.Length-1) Host = args[++i];
                            break;
                        case "-p":
                            if (i < args.Length-1) try {
                                Port = Int32.Parse(args[++i]);
                            } catch (Exception e) {
                                e.ToString();
                                Port = 6667;
                            }
                            break;
                        case "-v":
                            ReportMessage.verbosity = Verbosity.VeryVerbose;	
                            break;
                        case "-q":
                            ReportMessage.verbosity = Verbosity.Quiet;
                            break;
                        case "-P":
                            if (i < args.Length-1) _nickServPass = args[++i];
                            break;
                            //TODO: Add daemonizing?
                        case "-a":
                            if (i < args.Length-1) _autoSend = args[++i];
                            break;
                        case "--help":
                            //TODO Add helptext
                            break;
                        case "-c":
                            if (i < args.Length-1) _configFile = args[++i];
                            break;
                        case "--version":
                            ReportMessage.Log(Verbosity.Always,"AniNIX::TheRaven version 0.2");
                            break;
                    }
                }
            }
        }		

        /// <summary>
        /// Create a new Raven instance
        /// </summary>
        /// <param name="args">
        /// The arguments for creating the bot
        /// </param>
        public Raven(string[] args) {
            ReportMessage.Log(Verbosity.Always,"Reading arguments...");
            // If we have arguments
            this.ParseArguments(args);
            this.ConfigureSelfFromFiles();
            ReportMessage.Log(Verbosity.VeryVerbose,"Started with these values:");
            ReportMessage.Log(Verbosity.VeryVerbose,this.ToString());
        }

        /// <summary>
        /// Create a raven with default settings.
        /// </summary>
        public Raven(String host = "localhost", int port = 6667, String nick = "TheRaven-Guest", String nickServPass = "null", String autoSend = null, String _configFile = "raven.conf", Verbosity verbosity = Verbosity.Verbose) {
            this.Host = host;
            Port = port;
            Nick = nick;
            _nickServPass = nickServPass;
            _autoSend = autoSend;
            this._configFile = _configFile;
            ReportMessage.verbosity = verbosity;
        }

        /// <summary>
        /// Identify to the server and join the initial channels
        /// </summary> 
        public void IdentifySelfToServer() {
            ReportMessage.Log(Verbosity.Always,"Identifying to the server");
            //Read for the initial two NOTICE messages about Hostnames
            IRCServerMessage response = null;
            int countNotice = 0;
            while (countNotice < 2) {
                response = _connection.Read();
                if (response.msgCode.Equals("NOTICE")) countNotice += 1;
            }
            ReportMessage.Log(Verbosity.VeryVerbose,"Past the notices.");

            //Send USER and NICK lines to identify. 
            IRCClientMessage send = new IRCClientMessage();
            send.CreateCustomMessage(String.Format("NICK {0}\nUSER {0} * * :{0}",Nick));
            _connection.Write(send);
            ReportMessage.Log(Verbosity.VeryVerbose,"USER and NICK sent");

            //thanks to cfrayne for the refactor
            do {
                response = _connection.Read();
                if (response.msgCode != null && response.msgCode.Equals("433")) throw new AlreadyIdentifiedException();
            } while (response.msgCode == null || !response.msgCode.Equals("266"));

            //Identify to NickServ
            send.NickServIdent(_nickServPass);
            _connection.Write(send);
            ReportMessage.Log(Verbosity.VeryVerbose,"Identified to NickServ");

            //Send the autosend
            send.CreateCustomMessage(_autoSend);
            _connection.Write(send);
            ReportMessage.Log(Verbosity.VeryVerbose,"Sent autosend");		

            //Join the default channels
            foreach (String channel in channels) {
                if (channel != null && channel.Length > 2 && channel[0] == '#') {
                    send.CreateJoinMessage(channel);
                    _connection.Write(send);
                }
            }
        }

        /// <summary> 
        /// Read from the connection, and for each message act appropriately.
        /// </summary>
        public void LoopOnTraffic() {
            ReportMessage.Log(Verbosity.Verbose,"Looping on trafffic now! We're useful!");
            while (true) {
                IRCServerMessage response = _connection.Read();
                if (response != null && response.message != null && response.message.Length > 3 && response.message.Substring(0,2).Equals("r.")) {
                    RavenCommand.Respond(_connection,response,this);
                } else if (response != null) {
                    //Try to notify the admins when a given string is found in a given channel
                    String result;
                    if (notifications.TryGetValue(response.target,out result)) {
                        if (response.message.Contains(result)) {
                            try {
                                ExecuteCommand.Run(String.Format("/usr/local/bin/djinni admin \"Found {1} in {0}\"",response.target,result));
                            } catch (Exception e) {
                                ReportMessage.Log(Verbosity.Error,e.ToString());
                            }

                        }
                    }

                    // Integrate with the ALICE chatbot project.
                    // TODO Create a local instance instead
                    if (response.msgCode.Equals("PRIVMSG") && !String.IsNullOrWhiteSpace(response.message) && (response.target.Equals(Nick) || response.message.StartsWith(String.Format("{0}:",Nick)) || response.message.EndsWith(String.Format("{0}!",Nick)) || response.message.EndsWith(String.Format("{0}?",Nick)) || response.message.EndsWith(String.Format("{0}.",Nick)) || response.message.EndsWith(String.Format("{0}",Nick)))) {
                        IRCClientMessage send = new IRCClientMessage();
                        try {
                            String aliceResponse = ExecuteCommand.Run(String.Format("bash /usr/local/src/TheRaven/chatbot-support.bash \"{0}\" {1}",response.message.Replace("'","").Replace("\"","").Split('\n')[0].Trim(),Nick)).Trim();
                            if (String.IsNullOrWhiteSpace(aliceResponse)) throw new Exception("No response from ALICE chatbot service");
                            send.PrivMsg(aliceResponse,(response.target.Equals(Nick))?response.user:response.target);
                        } catch (Exception e) {
                            e.ToString();
                            send.PrivMsg("Cannot talk right now.",(response.target.Equals(Nick))?response.user:response.target);
                        }
                        _connection.Write(send);
                    }

                    /* CROWFACTS the deserving */
                    else if (crowFactsSubscribers.Contains(response.user) && randomSeed.Next(10) < 8) {
                        IRCClientMessage send = new IRCClientMessage();
                        int location = randomSeed.Next(crowFacts.Count);
                        send.PrivMsg(crowFacts[location],response.user);
                        _connection.Write(send);
                    }

                    // If the WebPage
                    if (WebPageAPI.URLRegEx.Match(response.message).Success) {
                        try { 
                        String title = WebPageAPI.GetPageTitle(WebPageAPI.URLRegEx.Match(response.message).Value); 
                        if (!String.IsNullOrWhiteSpace(title)) { 
                        IRCClientMessage send = new IRCClientMessage();
                        send.PrivMsg(String.Format("Web page title: {0}",title),(response.target.Equals(Nick))?response.user:response.target);
                        _connection.Write(send);
                        }
                        } catch (Exception e) {
                            e.ToString();
                        }
                    }
                }
            }
        }

        /// <summary>
        /// Close the _connection
        /// </summary>
        private void CloseConnection() {
            this._connection.Dispose();
        }

        /// <summary>
        /// Execute the work of connecting the IRCbot to the network and handle the traffic.
        /// </summaray>
        /// <returns> The proper OS-level exit status -- if there are problems, return 1; else return 0 </returns>
        public int Run() {
            ReportMessage.Log(Verbosity.Verbose,"Beginning...");

            //create a new _connection to the Host.
            try { 
                _connection = new Connection(this.Host,this.Port);
                IdentifySelfToServer();
                LoopOnTraffic();
                // Allow the program to exit cleanly

            } catch (RavenExitedException e) {
                this.CloseConnection();
                this.Dispose();
                ReportMessage.Log(Verbosity.Always,String.Format("Exited cleanly.\n{0}",e.Message));
                return 0;
            } 
            //Cleanly exit
            return 0;
        }

        /* Make a Raven disposable */

        /// <summary>
        /// Clean up this Connection, implementing IDisposable
        /// </summary>
        public void Dispose() {
            this.Dispose(true);
            GC.SuppressFinalize(this);
        }
        /// <summary>
        /// Force the GarbageCollector to Dispose if programmer does not
        /// </summary>
        ~Raven() {
            Dispose(false);
            ReportMessage.Log(Verbosity.Error,"Programmer forgot to dispose of Raven. Marking for Garbage Collector");
        }

        // This bool indicates whether we have disposed of this Raven
        public bool _isDisposed = false;

        /// <summary>
        /// Dispose of this Raven's's resources responsibly.
        /// </summary>
        private void Dispose(bool disposing) {
            if (!_isDisposed) {
                if (disposing) {
                    Host = null;
                    Port = 0;
                    _nickServPass = null;
                    _autoSend = null;                    _configFile = null;
                    whitelist = null;
                    blacklist = null;
                    magic8 = null;
                    crowFacts = null;
                    crowFactsSubscribers = null;
                    channels = null;
                    searches = null;

                }
                _connection.Dispose();
            }
            this._isDisposed = true;		
        }

        /// <summary>
        /// The default function
        /// </summary>
        static int Main(string[] args) {
            Raven theRaven = new Raven(args);
            ReportMessage.Log(Verbosity.Verbose,"### AniNIX::TheRaven ###");
            //Continue until we cleanly exit. 
            while (true) {
                try {
                    return theRaven.Run();
                    //If we are already identified, we're done. 
                } catch (AlreadyIdentifiedException e) {
                    ReportMessage.Log(Verbosity.Error,"There is already a Raven on this Host.");
                    ReportMessage.Log(Verbosity.Error,e.Message);
                    return 0;
                    // Timeouts should result in a respawn
                } catch (RavenTimedOutException e) {
                    ReportMessage.Log(Verbosity.Always,"Connection timed out. Respawning");
                    ReportMessage.Log(Verbosity.Verbose,e.Message);
                    continue;
                    //If an exception gets here, something went wrong
                } catch (Exception e) {
                    ReportMessage.Log(Verbosity.Error,"Unexpected exception caught!");
                    ReportMessage.Log(Verbosity.Error,e.ToString());
                    return 1;
                }
            }
        }
    }
}