using System;
using System.Collections.Generic;
using hwo.bitworks.identity;

namespace hwo.bitworks
{
	public class MultipleBitsSource
	{
		static Dictionary<Type,List<MultipleBitsSource>> knownSources = new Dictionary<Type, List<MultipleBitsSource>>();

		static protected void register(MultipleBitsSource s){
			Type t = s.GetType();
			if (!knownSources.ContainsKey(t)){
				knownSources.Add(t,new List<MultipleBitsSource>());
			}
			knownSources[t].Add(s);
		}

		protected LogicBase[] sources;

		public MultipleBitsSource()
		{
			register(this);
			this.sources = null;
		}

		public MultipleBitsSource(LogicBase[] sources)
		{
			this.sources = sources;
		}

		public virtual int getBits(){
			return sources.Length;
		}


		public virtual bool bitValue(int bit){
			throw new NotImplementedException(String.Format("Class {0} doesn't implement needed method 'bool bitValue(int bit)'",this.GetType().FullName));
		}

		public LogicBase getLogicalBase(int bit){
			return new BIT(this,bit);
		}

		public LogicBase[] getLogicalBases(){
			return getLogicalBases(0,getBits());
		}
		public LogicBase[] getLogicalBases(int start,int len){
			LogicBase[] lb = new LogicBase[len];

			for (int n=0;n<len;n++){
				lb[n] = getLogicalBase(n + start);
			}

			return lb;
		}

		public virtual BitIdentity getBitIdentity(int bit){
			throw new NotImplementedException(String.Format("Class {0} doesn't implement needed method 'BitIdentity getBitIdentity(int bit)'",this.GetType().FullName));
		}

		public class BIT : LogicBase {
			MultipleBitsSource source;
			int bit;

			public BIT(MultipleBitsSource source,int bit)
				:base(new LogicBase[0])
			{
				this.source = source;
				this.bit = bit;
			}

			public override bool value()
			{
				return source.bitValue(this.bit);
			}

			public override identity.BitIdentity identity()
			{
				return source.getBitIdentity(this.bit);
			}
		}

		public string SourceName {
			get {
				int no = knownSources[GetType()].IndexOf(this);
				return string.Format("{0}[{1}]",GetType().Name,no);
			}
		}
	}
}