//#define SQLLITE_CONNECTION_TEST
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SQLite;
using System.Diagnostics;
using Enterprise.Logging;
using libxmltv;
using libxmltv.Interfaces;
using libxmltv.Core;
namespace GBPVRProgramDatabaseFixer
{
    public interface ISQLLITE
    {
        List<SQLLITE.IPROGRAMME> Programs { get; }
        List<SQLLITE.IRECORDING_SCHEDULE> Recordings { get; }
        List<SQLLITE.ICHANNEL> Channels { get; }
        IDateTimeRange GetProgramsDateRange(List<SQLLITE.IPROGRAMME> programs);
        List<SQLLITE.IPROGRAMME> CreateUpdatedProgramsList(List<SQLLITE.IPROGRAMME> gbpvr_programs, List<libxmltv.Interfaces.IProgramDefinition> xmltv_programs, out List<SQLLITE.IPROGRAMME> removed_programs);

    }
    public class SQLLITE : ISQLLITE
    {
        public static ISQLLITE Create(string database, EventHandler<EventArgs> OnInstanceCreated)
        {
            return new SQLLITE(database, OnInstanceCreated);
        }

        #region DATABASE DEFINITIONS

        public interface ICHANNEL
        {
            Int64 oid { get; }
            String name { get; }
            String channelID { get; }
            Int64 channel_number { get; }
            String favourite_channel { get; }
            String display_name { get; }
        }
        private class CHANNEL : ICHANNEL
        {
            public CHANNEL() 
            {
                BaseDatabaseDefinition<CHANNEL>.CreateDefault(this); 
            }
            //public RECORDING_SCHEDULE(SQLiteDataReader r, int index) { BaseDatabaseDefinition<RECORDING_SCHEDULE>.Create(this, r, index); }

            public static void Create(ref CHANNEL instance, SQLiteDataReader r, int index)
            {
                BaseDatabaseDefinition<CHANNEL>.Create(ref instance, r, index);
            }
            #region ICHANNEL members
            public Int64 oid { get; set; }
            public String name { get; set; }
            public String channelID { get; set; }
            public Int64 channel_number { get; set; }
            public String favourite_channel { get; set; }
            public String display_name { get; set; }
            #endregion
        }
        public interface IRECORDING_SCHEDULE
        {
            Int64 oid { get; }
            Int64 programme_oid { get; }
            Int64 capture_source_oid { get; }
            Int16 status { get; }
            String filename { get; }
            Int64 recording_type { get; }
            Int64 recording_group { get; }
            DateTime manual_start_time { get; }
            DateTime manual_end_time { get; }
            Int64 manual_channel_oid { get; }
            Int64 quality_level { get; }
            Int64 pre_pad_minutes { get; }
            Int64 post_pad_minutes { get;}
            Int32 priority { get; }
            String conversion_profile { get; }
        }

        private static class BaseDatabaseDefinition<T>
        {
            public static void CreateDefault(T instance)
            {
                try
                {
                    Type t = typeof(T);
                    var props = t.GetProperties();
                    foreach (var prop in props)
                    {
                        Type prop_type = prop.PropertyType;
                        object field_value = null;
                        try
                        {
                            if (prop_type == typeof(string))
                            {
                                field_value = string.Empty;
                            }
                            else
                            {
                                field_value = Activator.CreateInstance(prop_type);
                            }
                        }
                        catch (Exception ex)
                        {
                            throw ex;
                        }
                        prop.SetValue(instance, field_value, null);
                    }
                }
                catch (Exception ex)
                {
                    throw ex;
                }
            }
            public static void Create(ref T instance, SQLiteDataReader r, int index)
            {                
                string field_name = r.GetName(index);
                Type field_type = r.GetFieldType(index);
                object field_value = r.GetValue(index);
                //gLog.Verbose.Debug.WriteLine("Name: '{0}' Type: '{1}' Value: '{2}'", field_name, field_type.Name, field_value == null ? "null" : field_value.ToString());

                Type t = typeof(T);
                var props = t.GetProperties();
                foreach (var prop in props)
                {
                    if (prop.Name.ToLower() == field_name.ToLower())
                    {
                        if (prop.PropertyType == field_type)
                        {
                            Type db_type = field_value.GetType();
                            try
                            {
                                if (db_type == typeof(System.DBNull))
                                {
                                    prop.SetValue(instance, null, null);
                                }
                                else
                                {
                                    prop.SetValue(instance, field_value, null);
                                }
                                
                            }
                            catch (Exception ex) 
                            {
                                throw ex;
                            }
                        }
                        else
                        {
                            gLog.Verbose.Debug.WriteLine("Found Property: {0} but there was a type mismatch. Property Type: '{1}' Expected: '{2}'", prop.Name, prop.PropertyType.Name, field_type.Name);
                            throw new InvalidOperationException(string.Format("Found Property: {0} but there was a type mismatch. Property Type: '{1}' Expected: '{2}'", prop.Name, prop.PropertyType.Name, field_type.Name));
                        }
                    }
                }

            }
        }

        private class RECORDING_SCHEDULE : IRECORDING_SCHEDULE
        {
            public RECORDING_SCHEDULE() 
            {
                BaseDatabaseDefinition<RECORDING_SCHEDULE>.CreateDefault(this); 
            }
            //public RECORDING_SCHEDULE(SQLiteDataReader r, int index) { BaseDatabaseDefinition<RECORDING_SCHEDULE>.Create(this, r, index); }

            public static void Create(ref RECORDING_SCHEDULE instance, SQLiteDataReader r, int index)
            {
                BaseDatabaseDefinition<RECORDING_SCHEDULE>.Create(ref instance, r, index); 
            }

            #region IRECORDING_SCHEDULE members
            public Int64 oid { get; set;}
            public Int64 programme_oid { get; set;}
            public Int64 capture_source_oid { get; set;}
            public Int16 status { get; set; }
            public String filename { get; set; }
            public Int64 recording_type { get;set; }
            public Int64 recording_group { get; set;}
            public DateTime manual_start_time { get; set;}
            public DateTime manual_end_time { get; set; }
            public Int64 manual_channel_oid { get; set; }
            public Int64 quality_level { get; set; }
            public Int64 pre_pad_minutes { get; set; }
            public Int64 post_pad_minutes { get; set; }
            public Int32 priority { get; set; }
            public String conversion_profile { get; set; }
            #endregion
        }

        public interface IPROGRAMME
        {
            Int64 oid { get; set; }
            String name { get; set; }
            String sub_title { get; set; }
            String description { get; set; }
            DateTime start_time { get; set; }
            DateTime end_time { get; set; }
            Int64 channel_oid { get; set; }
            String unique_identifier { get; set; }
            String rating { get; set; }

            IProgramDefinition AsXMLTVProgramDefinition(ISQLLITE sqllite);
        }
        private class PROGRAMME : IPROGRAMME
        {
            public PROGRAMME() 
            {
                BaseDatabaseDefinition<PROGRAMME>.CreateDefault(this); 
            }
            //public PROGRAMME(SQLiteDataReader r, int index) : base(r, index) { }
            public static void Create(ref PROGRAMME instance, SQLiteDataReader r, int index)
            {
                BaseDatabaseDefinition<PROGRAMME>.Create(ref instance, r, index);
            }
            #region IPROGRAMME members
            public Int64 oid { get; set; }
            public String name { get; set; }
            public String sub_title { get; set; }
            public String description { get; set; }
            public DateTime start_time { get; set; }
            public DateTime end_time { get; set; }
            public Int64 channel_oid { get; set; }
            public String unique_identifier { get; set; }
            public String rating { get; set; }
            public IProgramDefinition AsXMLTVProgramDefinition(ISQLLITE sqllite)
            {
                ProgramList.ProgramDefintion definition = new ProgramList.ProgramDefintion();
                var channel = sqllite.Channels.Find(s => s.oid == this.channel_oid);
                definition.ChannelName = channel.display_name;
                definition.ChannelNumber = (int)channel.channel_number;
                definition.Description = this.description;
                definition.Start = this.start_time.ToDateTimeString();
                definition.Stop = this.end_time.ToDateTimeString();
                definition.SubTitle = this.sub_title;
                definition.Title = this.name;
                return definition;
            }
            #endregion
        }
        #endregion
        private static class TABLES
        {
            public const string RECORDING_SCHEDULE = "RECORDING_SCHEDULE";
            public const string PROGRAMME = "PROGRAMME";
            public const string CHANNEL = "CHANNEL";
        }

        //public SQLLite() { }
        protected SQLLITE(string database, EventHandler<EventArgs> OnInstanceCreated) 
        {
            this.OnInstanceCreated = OnInstanceCreated;
            //CreateConnection(database);
            this.Database = database;
            if (!CreateDatabaseBackup())
            {
                gLog.Error.WriteLine("Failed to backup database.");
                return;
            }
            ConnectionTest();
            ReadChannelData();
            ReadRecodringScheduleData();
            ReadProgrammeData();
            OnCreatedInstance(this, new EventArgs());
        }

        [NonSerialized]
        private EventHandler<EventArgs> _OnInstanceCreated;
        private EventHandler<EventArgs> OnInstanceCreated { get { return _OnInstanceCreated; } set { _OnInstanceCreated = value; } }
        
        private void OnCreatedInstance(object sender, EventArgs e)
        {
            if (OnInstanceCreated != null) { OnInstanceCreated.Invoke(sender, e); }
        }

        private string Database;
        #region ISQLLITE members        
        public List<IPROGRAMME> Programs { get; private set; }
        public List<IRECORDING_SCHEDULE> Recordings { get; private set; }
        public List<ICHANNEL> Channels { get; private set; }

        public IDateTimeRange GetProgramsDateRange(List<SQLLITE.IPROGRAMME> programs)
        {
            var list = new List<IPROGRAMME>(programs.ToArray());
            DateTime first = new DateTime();
            DateTime last = new DateTime();
            first = list.OrderBy(s => s.start_time).ToList().First().start_time;            
            last = list.OrderBy(s => s.start_time).ToList().Last().start_time;
            gLog.Verbose.Debug.WriteLine("\tFirst: {0} = ({1})", first.ToString("yyyy/MM/dd HH:mm:ss.fffffff"), first.ToDateTimeString());
            gLog.Verbose.Debug.WriteLine("\tLast: {0} = ({1})", last.ToString("yyyy/MM/dd HH:mm:ss.fffffff"), last.ToDateTimeString());
            var range = DateTimeRange.Create(first, last);
            return range;
        }

        public List<SQLLITE.IPROGRAMME> CreateUpdatedProgramsList(List<SQLLITE.IPROGRAMME> gbpvr_programs, List<libxmltv.Interfaces.IProgramDefinition> xmltv_programs, out List<SQLLITE.IPROGRAMME> gbpvr_programs_not_found)
        {
            gbpvr_programs_not_found = new List<IPROGRAMME>();
            gbpvr_programs = gbpvr_programs.OrderBy(s => s.start_time).ToList();            
            List<SQLLITE.IPROGRAMME> source_valid = new List<IPROGRAMME>();
            //if (range == null)
            //{
            //    gLog.Warn.WriteLine("The DateTimeRange passed in is null...returning the original program list");
            //    return list;
            //}
            //gLog.Warn.WriteLine("FilterProgramsByDateRange has not been implemented");

            double total = gbpvr_programs.Count;
            double index = 0;
            double progress = 0;
            foreach (var program in gbpvr_programs)
            {
                ////if (program.start_time >= range.Start &&
                ////    program.start_time <= range.End)
                ////{
                ////    list2.Add(program);
                ////}
                ////else
                ////{
                ////    removed_programs.Add(program);
                ////}   
                //progress = 100.0 * (index / total);
                //gLog.ReportProgress(this, new ReportProgressEventArgs((int)progress, string.Format("Filtering GBPVR Programs: {0:00}%", (int)progress)));
                //var xmltv_entry = program.AsXMLTVProgramDefinition(this);
                //if (xmltv_programs.Contains(xmltv_entry))
                //{
                //    source_valid.Add(program);
                //}
                //else
                //{
                //    gbpvr_programs_not_found.Add(program);
                //}
                //index++;
                var channel_oid = program.channel_oid;
                var channel = this.Channels.Find(s => s.oid == channel_oid);
                var start_date = program.start_time;
                var xmltv_entry = xmltv_programs.Find(s => s.ChannelNumber == channel.channel_number && s.Start == start_date.ToDateTimeString());
                if (xmltv_entry == null)
                {
                    gbpvr_programs_not_found.Add(program);
                }
                else
                {
                    var updated_program = program;
                    updated_program.description = xmltv_entry.Description;
                    updated_program.end_time = DateTime.Parse(xmltv_entry.Stop);
                    updated_program.name = xmltv_entry.Title;
                    updated_program.start_time = DateTime.Parse(xmltv_entry.Start);                    
                    updated_program.sub_title = xmltv_entry.SubTitle;
                    source_valid.Add(updated_program);
                }
            }

            //for (int i = 0; i < programs.Count(); i++)
            //{
            //    var gbpvr_entry = gbpvr[i];
            //    var xmltv_entry = gbpvr_entry.AsXMLTVProgramDefinition(sqlite);
            //    if (!xmltv[i].Equals(xmltv_entry))
            //    {
            //        gLog.Warn.WriteLine("Warning GBPVR Program oid: {0} might be invalid", gbpvr_entry.oid);
            //    }
            //}

            source_valid = source_valid.OrderBy(s => s.channel_oid).ThenBy(s => s.start_time).ToList();
            gbpvr_programs_not_found = gbpvr_programs_not_found.OrderBy(s => s.channel_oid).ThenBy(s => s.start_time).ToList();

            gLog.Info.WriteLine("Total XMLTV Programs: 0x{0:x8}", xmltv_programs.Count);
            gLog.Info.WriteLine("Updated: 0x{0:x8} GB-PVR Programs", source_valid.Count);
            gLog.Info.WriteLine("Could not find: 0x{0:x8} GB-PVR Programs", gbpvr_programs_not_found.Count);
            gLog.Info.WriteLine("Total GB-PVR Programs: 0x{0:x8}", source_valid.Count + gbpvr_programs_not_found.Count);

            return source_valid;
        }
        #endregion


        private string CreateConnectionString()
        {
            string connection_string = string.Format("Data Source={0}", this.Database);
            return connection_string;
        }

        private SQLiteConnection CreateConnection() { SQLiteConnection connection = new SQLiteConnection(CreateConnectionString()); return connection; }

        [Conditional("SQLLITE_CONNECTION_TEST")]
        private void ConnectionTest()
        {
            try
            {
                using (SQLiteConnection con = CreateConnection())
                {
                    con.Open();
                    string command_text = string.Format("select * from {0};", TABLES.CHANNEL);
                    gLog.Verbose.Debug.WriteLine("Executing Command: '{0}'", command_text);
                    using (SQLiteCommand cmd = new SQLiteCommand(command_text, con))
                    {
                        using (SQLiteDataReader r = cmd.ExecuteReader())
                        {
                            if (!r.HasRows)
                            {
                                gLog.Warn.WriteLine("Query: '{0}' returned no rows.", cmd.CommandText);
                            }
                            else
                            {
                                while (r.Read())
                                {
                                    for (int i = 0; i < r.FieldCount; i++)
                                    {
                                        string field_name = r.GetName(i);
                                        Type field_type = r.GetFieldType(i);
                                        object field_value = r.GetValue(i);
                                        gLog.Verbose.Debug.WriteLine("Name: '{0}' Type: '{1}' Value: '{2}'", field_name, field_type.Name, field_value == null ? "null" : field_value.ToString());
                                    }
                                    break;
                                }
                            }
                        }
                    }
                    con.Clone();
                }
                OnCreatedInstance(this, new EventArgs());
            }
            catch (Exception ex)
            {
                gLog.Error.WriteLine(ex.ToString());
            }
        }


        private bool CreateDatabaseBackup()
        {
            try
            {
                string backup_file = string.Format("{0}.{1}", this.Database, DateTime.Now.ToString("yyyyMMddHHmmss"));
                gLog.Info.WriteLine("Creating Database backup...");
                gLog.Info.WriteLine("\tSource: {0}", this.Database);
                gLog.Info.WriteLine("\tDestination: {0}", backup_file);

                System.IO.File.Copy(this.Database, backup_file);
                return true;
            }
            catch (Exception ex)
            {
                gLog.Error.WriteLine(ex.ToString());
                return false;
            }
        }
        private void ReadChannelData()
        {
            try
            {
                List<ICHANNEL> channels = new List<ICHANNEL>();
                using (SQLiteConnection con = CreateConnection())
                {
                    con.Open();
                    string command_text = string.Format("select * from {0};", TABLES.CHANNEL);
                    gLog.Verbose.Debug.WriteLine("Executing Command: '{0}'", command_text);
                    using (SQLiteCommand cmd = new SQLiteCommand(command_text, con))
                    {
                        using (SQLiteDataReader r = cmd.ExecuteReader())
                        {
                            if (!r.HasRows)
                            {
                                gLog.Warn.WriteLine("Query: '{0}' returned no rows.", cmd.CommandText);
                            }
                            else
                            {
                                while (r.Read())
                                {
                                    CHANNEL channel = new CHANNEL();
                                    for (int i = 0; i < r.FieldCount; i++)
                                    {
                                        CHANNEL.Create(ref channel, r, i);
                                    }
                                    channels.Add(channel);
                                }
                            }
                        }
                    }
                    con.Clone();
                }
                this.Channels = channels;
            }
            catch (Exception ex)
            {
                gLog.Error.WriteLine(ex.ToString());
            }
        }
        private void ReadProgrammeData()
        {
            try
            {
                List<IPROGRAMME> programs = new List<IPROGRAMME>();
                using (SQLiteConnection con = CreateConnection())
                {
                    con.Open();
                    string command_text = string.Format("select * from {0};", TABLES.PROGRAMME);
                    gLog.Verbose.Debug.WriteLine("Executing Command: '{0}'", command_text);
                    using (SQLiteCommand cmd = new SQLiteCommand(command_text, con))
                    {
                        using (SQLiteDataReader r = cmd.ExecuteReader())
                        {
                            if (!r.HasRows)
                            {
                                gLog.Warn.WriteLine("Query: '{0}' returned no rows.", cmd.CommandText);
                            }
                            else
                            {
                                while (r.Read())
                                {
                                    PROGRAMME program = new PROGRAMME();
                                    for (int i = 0; i < r.FieldCount; i++)
                                    {
                                        PROGRAMME.Create(ref program, r, i);
                                    }
                                    programs.Add(program);
                                }
                            }
                        }
                    }
                    con.Clone();
                }
                this.Programs = programs;
            }
            catch (Exception ex)
            {
                gLog.Error.WriteLine(ex.ToString());
            }
        }
        private void ReadRecodringScheduleData()
        {
            try
            {
                List<IRECORDING_SCHEDULE> recordings = new List<IRECORDING_SCHEDULE>();
                using (SQLiteConnection con = CreateConnection())
                {
                    con.Open();
                    string command_text = string.Format("select * from {0};", TABLES.RECORDING_SCHEDULE);
                    gLog.Verbose.Debug.WriteLine("Executing Command: '{0}'", command_text);
                    using (SQLiteCommand cmd = new SQLiteCommand(command_text, con))
                    {
                        using (SQLiteDataReader r = cmd.ExecuteReader())
                        {
                            if (!r.HasRows)
                            {
                                gLog.Warn.WriteLine("Query: '{0}' returned no rows.", cmd.CommandText);
                            }
                            else
                            {
                                while (r.Read())
                                {
                                    RECORDING_SCHEDULE recording = new RECORDING_SCHEDULE();
                                    for (int i = 0; i < r.FieldCount; i++)
                                    {
                                        RECORDING_SCHEDULE.Create(ref recording, r, i);
                                    }
                                    recordings.Add(recording);
                                }
                            }
                        }
                    }
                    con.Clone();
                }
                this.Recordings = recordings;
            }
            catch (Exception ex)
            {
                gLog.Error.WriteLine(ex.ToString());
            }
        }

    }
}