/*
 * Copyright (C) 2007-2012 Xagasoft, All rights reserved.
 *
 * This file is part of the libgats library and is released under the
 * terms of the license contained in the file LICENSE.
 */

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

namespace Com.Xagasoft.Gats
{
    /// <summary>
    /// Encapsulates a single list of GatsObjects.
    /// </summary>
    /// <remarks>
    /// A list of arbitrary size containing ordered GatsObjects.  All standard
    /// .NET IList, ICollection, and IEnumerable interfaces are implemented,
    /// so a GatsList should work just like a standard List, but with a few
    /// extras.
    /// </remarks>
    public class GatsList : GatsObject, IList<GatsObject>,
        ICollection<GatsObject>, IEnumerable<GatsObject>
//        IReadOnlyList<GatsObject>, IReadOnlyCollection<GatsObject>,
//        These two are in .net 4.5, not 4.0, mono can't use them.
    {
        private List<GatsObject> Value = new List<GatsObject>();

        public GatsList()
        {
        }

        public override string ToString()
        {
            StringBuilder bld = new StringBuilder();
            bld.Append("[");
            for( int j = 0; j < Value.Count-1; j++ )
            {
                bld.Append( Value[j] );
                bld.Append(", ");
            }
            bld.Append( Value[Value.Count-1] );
            bld.Append("]");
            return bld.ToString();
        }

        public override void Read( Stream s, char type )
        {
            for(;;)
            {
                GatsObject obj = GatsObject.Read( s );
                if( obj == null )
                    break;
                Value.Add( obj );
            }
        }

        public override void Write( Stream s )
        {
            s.WriteByte( (int)'l' );
            foreach( GatsObject obj in Value )
            {
                obj.Write( s );
            }
            s.WriteByte( (int)'e' );
        }

        //
        // Helper functions
        //

        /// <summary>
        /// Helper function to add a new GatsString to the list.
        /// </summary>
        /// <param name="val">The byte array to be added as a GatsString</param>
        public void Add( byte[] val )
        {
            Add( new GatsString( val ) );
        }

        /// <summary>
        /// Helper function to add a new GatsString to the list.
        /// </summary>
        /// <remarks>
        /// The string is encoded UTF-8 by .NETs internal facilities.
        /// </remarks>
        /// <param name="val">The string to be added as a GatsString</param>
        public void Add( string val )
        {
            Add( new GatsString( val ) );
        }

        /// <summary>
        /// Helper function to add a new GatsInteger to the list.
        /// </summary>
        /// <remarks>
        /// Implicit upcasting should allow all integer types (byte, short,
        /// int, long), and automatic unboxing should allow all object variants
        /// to be passed into this method without problem.
        /// </remarks>
        /// <param name="val">The long to be added as a GatsInteger</param>
        public void Add( long val )
        {
            Add( new GatsInteger( val ) );
        }

        /// <summary>
        /// Helper function to add a new GatsFloat to the list.
        /// </summary>
        /// <remarks>
        /// Implicit upcasting should allow floats and doubles to both be
        /// accepted by this method.  Please note that decimal types are not
        /// strictly compatible, please see GatsFloat for more details.
        /// </remarks>
        /// <param name="val">The double to be added as a GatsFloat</param>
        public void Add( double val )
        {
            Add( new GatsFloat( val ) );
        }

        /// <summary>
        /// Helper function to add a new GatsBoolean to the list.
        /// </summary>
        /// <param name="val">
        /// The boolean value to be added as a GatsBoolean
        /// </param>
        public void Add( bool val )
        {
            Add( new GatsBoolean( val ) );
        }

        /// <summary>
        /// Helper to append a GatsNull to the list.
        /// </summary>
        public void AddNull()
        {
            Add( new GatsNull() );
        }

        /// <summary>
        /// Helper to append a GatsDictionary to the list.
        /// </summary>
        /// <remarks>
        /// A new GatsDictionary is constructed, appended to the list, and
        /// returned.
        /// </remarks>
        public GatsDictionary AddDict()
        {
            GatsDictionary dict = new GatsDictionary();
            Add( dict );
            return dict;
        }

        /// <summary>
        /// Helper to append a GatsList to the list.
        /// </summary>
        /// <remarks>
        /// A new GatsList is constructed, appended to the list, and returned.
        /// </remarks>
        public GatsList AddList()
        {
            GatsList list = new GatsList();
            Add( list );
            return list;
        }

        //
        // List interface overrides under here.
        //
        public int IndexOf( GatsObject obj )
        {
            return Value.IndexOf( obj );
        }

        public void Insert( int idx, GatsObject obj )
        {
            Value.Insert( idx, obj );
        }

        public void RemoveAt( int idx )
        {
            Value.RemoveAt( idx );
        }

        public GatsObject this[int idx] {
            get { return this.Value[idx]; }
            set { this.Value[idx] = value; }
        }
        
        public int Count {
            get { return this.Value.Count; }
        }

        public bool IsReadOnly {
            get { return false; } // this.Value.IsReadOnly; }
        }

        public void Add( GatsObject obj )
        {
            Value.Add( obj );
        }

        public void Clear()
        {
            Value.Clear();
        }

        public bool Contains( GatsObject obj )
        {
            return Value.Contains( obj );
        }

        public void CopyTo( GatsObject[] result, int count )
        {
            Value.CopyTo( result, count );
        }

        public bool Remove( GatsObject obj )
        {
            return Value.Remove( obj );
        }

        IEnumerator<GatsObject> IEnumerable<GatsObject>.GetEnumerator()
        {
            return Value.GetEnumerator();
        }
        
        IEnumerator IEnumerable.GetEnumerator()
        {
            return Value.GetEnumerator();
        }

        public bool IsFixedSize {
            get { return false; } // this.Value.IsFixedSize; }
        }

        public bool IsSynchronized {
            get { return false; } // this.Value.IsSynchronized; }
        }

        public object SyncRoot {
            get { return null; } // this.Value.SyncRoot; }
        }

    }
}