using System;

using System.Reflection;





namespace MSR.LST.ConferenceXP.ArchiveService

{

    /// <summary>

    /// Constants class..Static to hold all the constants for the application

    /// </summary>

    public abstract class Constants

    {

        public static string    PersistenceCName = "ArchiveService@microsoft.com";      // name of us as a participant

        public static string    PersistenceName = "Archive Service";



        public static int       MaxDBStringSize = 255;                                   // no. of chars allowed in varchar datatypes



        public static string    SQLConnectionString = 

            "Initial Catalog='ArchiveService';Data Source=.;Integrated Security=true;Connect Timeout=120";



        public const int        TicksPerMs = 10000;                                     // handy constant

        public static int       CommandTimeout = 60;                                    // command timeout used on commands in DBHelper



        // Recording constants

        public static int       InitialStreams = 4;                                     // number of streams we expect 

        public static int       BufferSize = 405 * 8080 / 4;                            // 1/4 of the data than an intermediate page in a SQL BLOB can hold

        public static int       BufferTimeout = -1;                                     // timeout before buffer writes to disk; turned off

        public static int       IndexCapacity = BufferSize / 1024;                      // allow for 1024 byte frames

        public static int       InitialBuffers = 2;                                     // basic # of buffers necessary under small load

        public static int       MaxBuffers = 8;                                         // under horrendous load, we can peak to this

        public static int       StopAfterVenueEmptySec = 60;                            // <x> sec after a venue is empty, we stop recording



        // Playback constants

        public static int       BuffersPerStream  = 2;                                  // One to buffer, one to send.  30 sec buffering / sender.

        public static long      LongestSleepTime = 1000 * TicksPerMs;                   // The longest time the sending thread should nap.

        public static int       PlaybackBufferInterval = 10 * 1000 * TicksPerMs;        // temporal length of buffer, in ms

                                            // intentionally equivelant to the time a recording buffer of medium-qual video

        public static int       TicksSpent = 16 * TicksPerMs;                           // a debugging constant for displaying too much time spent

        public static int       SenderCreationLeadTime = 500 * TicksPerMs;              // time before a sender is needed that is created



        // remoting stuff

        public static int       TCPListeningPort = 8082;                                // port that our remoting object listens on





        #region App.Config Overrides

        private const string baseName = "MSR.LST.ConferenceXP.ArchiveService.";



        /// <summary>

        /// This static constructor reads for every non-constant static field in the class and checks for an app.config override.

        /// </summary>

        static Constants()

        {

            Type myType = typeof(Constants);

            FieldInfo[] fields = myType.GetFields(BindingFlags.Public | BindingFlags.Static);

            foreach (FieldInfo field in fields)

            {

                if (field.IsLiteral) // Is Constant?

                    continue; // We can't set it



                string fullName = baseName + field.Name;

                string configOverride = System.Configuration.ConfigurationManager.AppSettings[fullName];

                if (configOverride != null && configOverride != String.Empty)

                {

                    Type newType = field.FieldType;

                    object newValue = Convert.ChangeType(configOverride, newType);

                    field.SetValue(null, newValue);

                }

            }

        }

        #endregion

    }

}