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

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
        private string _nick; // 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 configDir; // This is the configuration directory. 
        private Connection _connection; //This is the socket to the Host

        public List<String> channels = new List<String>(); //This is the list of channels to join
        public List<String> whitelist = new List<String>(); //This is the list of admin users.
        public List<String> blacklist = new List<String>(); // This is the list of blocked people.
        public String helpText = null; // This is the text to send when people ask for help -- this is configurable to allow for skinning	
        public List<String> searches = new List<String>(); //These are the searches
        public String[] magic8 = null; //These are the strings to return like a Magic 8-ball to questions. 
        public String[] crowFacts = null; //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.

        public static Verbosity verbosity { get; private set; } // This is the level to which this and all Raven instances will log.

        /// <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",configDir));
            sb.Append(String.Format("Verbosity: {0}\n",Raven.verbosity));
            return sb.ToString();
        }

        /// <summary>
        /// Read from the files in the 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 configDir) {

            if (configDir==null || configDir == "" || !Directory.Exists(configDir)) {
                ReportMessage.Log(Verbosity.Error,"Configuration directory does not exist!");
                return;
            }


            ReportMessage.Log(Verbosity.Always,String.Format("Reading from files in {0}...",configDir)); 

            //These are locals that will be used throughout
            ReportMessage.Log(Verbosity.Verbose,"Reading login defaults");
            String[] loginDefaults = RavenConfigure.ReadLineDelimitedFile(Path.Combine(configDir,"loginDefaults.txt")).ToArray();
            //We have to populate these properties fom the list explicitly
            if (loginDefaults.Length < 4) {
                ReportMessage.Log(Verbosity.Error,"Login defaults are incomplete. No changes made.");
            } else {
                Host = (Host==null) ? loginDefaults[0] : Host;
                try {
                    Port = (Port == 0)  ? Int32.Parse(loginDefaults[1]) : Port;
                } catch (Exception e) {
                    ReportMessage.Log(Verbosity.Verbose,"Cannot parse Port.");
                    e.ToString();
                    Port = 6667;
                }
                _nick = (_nick == null) ? loginDefaults[2] : _nick;
                _nickServPass = (_nickServPass == null) ? loginDefaults[3] : _nickServPass;
            }

            //Read all the channels to join.
            List<String> tempChannels = RavenConfigure.ReadLineDelimitedFile(Path.Combine(configDir,"rooms.txt"));
            // Because the convention is to use # for comments, channels in the rooms.txt file do not start with a #
            foreach (String channel in tempChannels) {
                channels.Add(String.Format("#{0}",channel));
            }

            //Read the whitelist of folks allowed to execute administrative commands
            whitelist = RavenConfigure.ReadLineDelimitedFile(Path.Combine(configDir,"whitelist.txt"));

            //Read the blacklist of folks not allowed to do anything.
            blacklist = RavenConfigure.ReadLineDelimitedFile(Path.Combine(configDir,"blacklist.txt"));

            //Read the helptext
            helpText = RavenConfigure.ReadFirstLineFromFile(Path.Combine(configDir,"helptext.txt"));

            //Read the searches to use
            searches = RavenConfigure.ReadLineDelimitedFile(Path.Combine(configDir,"searches.txt"));

            //Read the Magic8 options
            magic8 = RavenConfigure.ReadLineDelimitedFileToArr(Path.Combine(configDir,"magic8.txt"));

            //Read the CrowFacts
            crowFacts = RavenConfigure.ReadLineDelimitedFileToArr(Path.Combine(configDir,"crowfacts.txt"));

            //Read the notifications
            foreach (String combo in RavenConfigure.ReadLineDelimitedFileToArr(Path.Combine(configDir,"notifications.txt"))) {
                String[] byPipe = combo.Split('|');
                notifications.Add(String.Format("#{0}",byPipe[0]),byPipe[1]);
            }
        }

        /// <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":
                            Raven.verbosity = Verbosity.VeryVerbose;	
                            break;
                        case "-q":
                            Raven.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) configDir = args[++i];
                            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(configDir);

            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 configDir = "/usr/local/etc/TheRaven-Local", Verbosity verbosity = Verbosity.Verbose) {
            this.Host = host;
            Port = port;
            _nick = nick;
            _nickServPass = nickServPass;
            _autoSend = autoSend;
            this.configDir = configDir;
            Raven.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 {
                                RavenExecute.Command(String.Format("djinni admin \"Found {1} in {0}\"",response.target,result));
                            } catch (Exception e) {
                                ReportMessage.Log(Verbosity.Error,e.ToString());
                            }

                        }
                    }

                    //TODO Implement the dialog options and link reponse

                /* CROWFACTS the deserving */

                if (crowFactsSubscribers.Contains(response.user) && randomSeed.Next(10) < 8) {
                    IRCClientMessage send = new IRCClientMessage();
                    int location = randomSeed.Next(crowFacts.Length);
                    send.PrivMsg(crowFacts[location],response.user);
                    _connection.Write(send);
                }
                }

            }
        }

        /// <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;
                    configDir = 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;
                }
            }
        }
    }
}