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package prompto.utils;

import java.util.Collection;
import java.util.Iterator;

import prompto.expression.IExpression;
import prompto.intrinsic.IterableWithCounts;
import prompto.runtime.Context;
import prompto.value.IValue;

public class IValueIterable implements IterableWithCounts {

	Context context;
	Collection iterable;
	
	public IValueIterable(Context context, Collection iterable) {
		this.context = context;
		this.iterable = iterable;
	}

	@Override
	public Long getCount() {
		return (long)iterable.size();
	}
	
	@Override
	public Long getTotalCount() {
		return (long)iterable.size();
	}
	
	@Override
	public Iterator iterator() {
		return new Iterator() {
		
			Iterator iterator = iterable.iterator();
			
			@Override
			public boolean hasNext() {
				return iterator.hasNext();
			}
	
			@Override
			public IValue next() {
				try {
					Object value = iterator.next();
					if (value instanceof IExpression)
						value = ((IExpression) value).interpret(context);
					if (value instanceof IValue)
						return (IValue) value;
					else
						throw new InternalError("Item not a value!");
				} catch (Throwable t) {
					throw new InternalError(t.getMessage());
				}
	
			}
	
			@Override
			public void remove() {
				throw new InternalError("Should never get there");
			}
		};
	}
}