package jcgp.backend.function;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;


/**
 * 
 * @author Eduardo Pedroni
 *
 */
public abstract class FunctionSet {
		protected Function[] functionList;
		protected ArrayList<Integer> allowedFunctions;
		protected String name;
		
		public int getAllowedFunctionCount() {
			return allowedFunctions.size();
		}
		
		public int getTotalFunctionCount() {
			return functionList.length;
		}
		
		public Function getAllowedFunction(int index) {
			return functionList[allowedFunctions.get(index)];
		}
		
		public Function getFunction(int index) {
			return functionList[index];
		}
		
		public int getMaxArity(){
			int arity = 0;
			for (Function function : functionList) {
				if (function.getArity() > arity) {
					arity = function.getArity();
				}
			}
			return arity;
		}
		
		public String getName() {
			return name;
		}
		
		public void disableFunction(int index) {
			if (index < functionList.length) {
				for (Iterator<Integer> iterator = allowedFunctions.iterator(); iterator.hasNext();) {
					int function = iterator.next();
					if (function == index) {
						iterator.remove();
					}
				}
			} else {
				throw new IndexOutOfBoundsException("Function " + index + " does not exist, the set only has " + functionList.length + " functions.");
			}
		}
		
		public void enableFunction(int index) {
			if (!allowedFunctions.contains(index)) {
				allowedFunctions.add(index);
				Collections.sort(allowedFunctions);
			}
		}
		
		@Override
		public String toString() {
			return name;
		}
		
		public boolean isEnabled(Function f) {
			for (int i = 0; i < allowedFunctions.size(); i++) {
				if (functionList[allowedFunctions.get(i)] == f) {
					return true;
				}
			}
			return false;
		}
		
		protected void enableAll() {
			allowedFunctions = new ArrayList<Integer>();
			for (int i = 0; i < functionList.length; i++) {
				allowedFunctions.add(i);
			}
		}
	}