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

namespace Com.Xagasoft.Gats
{
    public class GatsDictionary : GatsObject, IDictionary<string, GatsObject>
//	    ICollection<KeyValuePair<string, GatsObject>>,
//      IEnumerable<KeyValuePair<string, GatsObject>>
    {
        private Dictionary<string, GatsObject> Value =
            new Dictionary<string, GatsObject>();

        public GatsDictionary()
        {
        }

        public override string ToString()
        {
            StringBuilder bld = new StringBuilder();
            bld.Append("{");
            bool begin = true;
            foreach( KeyValuePair<string, GatsObject> j in Value )
            {
                if( begin )
                    begin = false;
                else
                    bld.Append(", ");
                bld.Append( j.Key );
                bld.Append(" = ");
                bld.Append( j.Value );
            }
            bld.Append("}");
            return bld.ToString();
        }

        public override void Read( Stream s, char type )
        {
            for(;;)
            {
                GatsObject key = GatsObject.Read( s );
                if( key == null )
                    break;
                if( key.GetType() != typeof(GatsString) )
                    throw new GatsException( GatsException.Type.InvalidFormat );
                Value.Add( key.ToString(), GatsObject.Read( s ) );
            }
        }

        public override void Write( Stream s )
        {
            s.WriteByte( (int)'d' );
            foreach( KeyValuePair<string, GatsObject> j in Value )
            {
                new GatsString( j.Key ).Write( s );
                j.Value.Write( s );
            }
            s.WriteByte( (int)'e' );
        }

        //
        // List interface overrides under here.
        //
        public void Add( string key, GatsObject obj )
        {
            Value.Add( key, obj );
        }

        public bool Remove( string key )
        {
            return Value.Remove( key );
        }

        public bool ContainsKey( string key )
        {
            return Value.ContainsKey( key );
        }

        public bool TryGetValue( string key, out GatsObject obj )
        {
            return Value.TryGetValue( key, out obj );
        }

        public GatsObject this[string key]
        {
            get { return this.Value[key]; }
            set { this.Value[key] = value; }
        }
        
        public ICollection<string> Keys
        {
            get { return this.Value.Keys; }
        }

        public ICollection<GatsObject> Values
        {
            get { return this.Value.Values; }
        }

        public int Count
        {
            get { return this.Value.Count; }
        }

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

        public void Add( KeyValuePair<string,GatsObject> pair )
        {
            ((IDictionary<string,GatsObject>)Value).Add( pair );
        }

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

        public bool Contains( KeyValuePair<string,GatsObject> pair )
        {
            return ((IDictionary<string,GatsObject>)Value).Contains( pair );
        }

        public void CopyTo( KeyValuePair<string,GatsObject>[] result,
                int count )
        {
            ((IDictionary<string,GatsObject>)Value).CopyTo( result, count );
        }
        
        public bool Remove( KeyValuePair<string,GatsObject> pair )
        {
            return ((IDictionary<string,GatsObject>)Value).Remove( pair );
        }

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

        IEnumerator IEnumerable.GetEnumerator()
        {
            return Value.GetEnumerator();
        }
    }
}