using System;
using System.Linq;
using System.Reflection;
using System.Security.Cryptography;
using System.Text;

namespace Cosmos.Compiler.Assembler
{
    public class Label : Instruction
    {
        public static string GetFullName( MethodBase aMethod )
        {
            return MethodInfoLabelGenerator.GenerateLabelName( aMethod );
        }

        public static string FilterStringForIncorrectChars( string aName )
        {
            return String.Intern( DataMember.FilterStringForIncorrectChars( aName.Replace( ".", "__DOT__" ) ) );
        }


        public Label( MethodBase aMethod )
            : this( MethodInfoLabelGenerator.GenerateLabelName( aMethod ) )
        {
        }

        public Label( string aName )
        {
            mName = aName;
            if( !aName.StartsWith( "." ) )
            {
                LastFullLabel = aName;
                QualifiedName = aName;
            }
            else
            {
                QualifiedName = LastFullLabel + aName;
            }
        }





        public static string GetLabel( object aObject )
        {
            Label xLabel = aObject as Label;
            if( xLabel == null )
                return "";
            return xLabel.Name;
        }

        public static string LastFullLabel
        {
            get;
            set;
        }


        public string QualifiedName
        {
            get;
            private set;
        }


        public bool IsGlobal
        {
            get;
            set;
        }

        public string Name
        {
            get { return mName; }
        }

        private string mName;

        public override void WriteText( Assembler aAssembler, System.IO.TextWriter aOutput )
        {
            if( IsGlobal )
            {
                aOutput.Write( "global " );
                aOutput.WriteLine( FilterStringForIncorrectChars( QualifiedName ) );
            }
            aOutput.Write( FilterStringForIncorrectChars( QualifiedName ) );
            aOutput.Write( ":" );
        }

        public override bool IsComplete( Assembler aAssembler )
        {
            return true;
        }

        public override void UpdateAddress( Assembler aAssembler, ref ulong aAddress )
        {
            base.UpdateAddress( aAssembler, ref aAddress );
        }


        public override void WriteData( Assembler aAssembler, System.IO.Stream aOutput )
        {
        }
    }
}