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/**
 * Copyright (C) 2010-2018 Gordon Fraser, Andrea Arcuri and EvoSuite
 * contributors
 *
 * This file is part of EvoSuite.
 *
 * EvoSuite is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3.0 of the License, or
 * (at your option) any later version.
 *
 * EvoSuite is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with EvoSuite. If not, see .
 */
/**
 * 
 */
package org.evosuite.coverage.mutation;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.evosuite.graphs.cfg.BytecodeInstruction;
import org.objectweb.asm.tree.AbstractInsnNode;
import org.objectweb.asm.tree.InsnList;


/**
 * MutationPool class.
 *
 * @author fraser
 */
public class MutationPool {

	// maps className -> method inside that class -> list of branches inside that method 
	private static Map>> mutationMap = new HashMap>>();

	// maps the mutationIDs assigned by this pool to their respective Mutations
	private static Map mutationIdMap = new HashMap();

	private static int numMutations = 0;

	/**
	 * addMutation
	 *
	 * @param className a {@link java.lang.String} object.
	 * @param methodName a {@link java.lang.String} object.
	 * @param mutationName a {@link java.lang.String} object.
	 * @param instruction a {@link org.evosuite.graphs.cfg.BytecodeInstruction} object.
	 * @param mutation a {@link org.objectweb.asm.tree.AbstractInsnNode} object.
	 * @param distance a {@link org.objectweb.asm.tree.InsnList} object.
	 * @return a {@link org.evosuite.coverage.mutation.Mutation} object.
	 */
	public static Mutation addMutation(String className, String methodName,
	        String mutationName, BytecodeInstruction instruction,
	        AbstractInsnNode mutation, InsnList distance) {

		if (!mutationMap.containsKey(className))
			mutationMap.put(className, new HashMap>());

		if (!mutationMap.get(className).containsKey(methodName))
			mutationMap.get(className).put(methodName, new ArrayList());

		Mutation mutationObject = new Mutation(className, methodName, mutationName,
		        numMutations++, instruction, mutation, distance);
		mutationMap.get(className).get(methodName).add(mutationObject);
		mutationIdMap.put(mutationObject.getId(), mutationObject);

		return mutationObject;
	}

	/**
	 * addMutation
	 *
	 * @param className a {@link java.lang.String} object.
	 * @param methodName a {@link java.lang.String} object.
	 * @param mutationName a {@link java.lang.String} object.
	 * @param instruction a {@link org.evosuite.graphs.cfg.BytecodeInstruction} object.
	 * @param mutation a {@link org.objectweb.asm.tree.InsnList} object.
	 * @param distance a {@link org.objectweb.asm.tree.InsnList} object.
	 * @return a {@link org.evosuite.coverage.mutation.Mutation} object.
	 */
	public static Mutation addMutation(String className, String methodName,
	        String mutationName, BytecodeInstruction instruction, InsnList mutation,
	        InsnList distance) {

		if (!mutationMap.containsKey(className))
			mutationMap.put(className, new HashMap>());

		if (!mutationMap.get(className).containsKey(methodName))
			mutationMap.get(className).put(methodName, new ArrayList());

		Mutation mutationObject = new Mutation(className, methodName, mutationName,
		        numMutations++, instruction, mutation, distance);
		mutationMap.get(className).get(methodName).add(mutationObject);

		mutationIdMap.put(mutationObject.getId(), mutationObject);

		return mutationObject;
	}

	/**
	 * Returns a List containing all mutants in the given class and method
	 *
	 * Should no such mutant exist an empty List is returned
	 *
	 * @param className a {@link java.lang.String} object.
	 * @param methodName a {@link java.lang.String} object.
	 * @return a {@link java.util.List} object.
	 */
	public static List retrieveMutationsInMethod(String className,
	        String methodName) {
		List r = new ArrayList();
		if (mutationMap.get(className) == null)
			return r;
		List mutants = mutationMap.get(className).get(methodName);
		if (mutants != null)
			r.addAll(mutants);
		return r;
	}

	/**
	 * getMutants
	 *
	 * @return a {@link java.util.List} object.
	 */
	public static List getMutants() {
		return new ArrayList(mutationIdMap.values());
	}
	
	public static Mutation getMutant(int id) {
		return mutationIdMap.get(id);
	}

	/**
	 * Remove all known mutants
	 */
	public static void clear() {
		mutationMap.clear();
		mutationIdMap.clear();
		numMutations = 0;
	}

	/**
	 * Returns the number of currently known mutants
	 *
	 * @return The number of currently known mutants
	 */
	public static int getMutantCounter() {
		return numMutations;
	}
}