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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.instrumentation.testability;

import java.util.List;

import org.evosuite.instrumentation.TransformationStatistics;
import org.evosuite.instrumentation.testability.BooleanHelper;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.objectweb.asm.tree.AbstractInsnNode;
import org.objectweb.asm.tree.ClassNode;
import org.objectweb.asm.tree.InsnList;
import org.objectweb.asm.tree.InsnNode;
import org.objectweb.asm.tree.MethodInsnNode;
import org.objectweb.asm.tree.MethodNode;

/**
 * ComparisonTransformation class.
 *
 * @author Gordon Fraser
 */
public class ComparisonTransformation {

	private final ClassNode cn;

	/**
	 * Constructor for ComparisonTransformation.
	 *
	 * @param cn a {@link org.objectweb.asm.tree.ClassNode} object.
	 */
	public ComparisonTransformation(ClassNode cn) {
		this.cn = cn;
	}

	/**
	 * transform
	 *
	 * @return a {@link org.objectweb.asm.tree.ClassNode} object.
	 */
	@SuppressWarnings("unchecked")
	public ClassNode transform() {
		List methodNodes = cn.methods;
		for (MethodNode mn : methodNodes) {
			transformMethod(mn);
		}
		return cn;
	}

	/**
	 * transformMethod
	 *
	 * @param mn a {@link org.objectweb.asm.tree.MethodNode} object.
	 */
	public void transformMethod(MethodNode mn) {
		AbstractInsnNode node = mn.instructions.getFirst();
		while (node != mn.instructions.getLast()) {
			AbstractInsnNode next = node.getNext();
			if (node instanceof InsnNode) {
				InsnNode in = (InsnNode) node;
				if (in.getOpcode() == Opcodes.LCMP) {
					insertLongComparison(in, mn.instructions);
					TransformationStatistics.transformedComparison();
				} else if (in.getOpcode() == Opcodes.DCMPG) {
					TransformationStatistics.transformedComparison();
					insertDoubleComparisonG(in, mn.instructions);
				} else if (in.getOpcode() == Opcodes.DCMPL) {
					TransformationStatistics.transformedComparison();
					insertDoubleComparisonL(in, mn.instructions);
				} else if (in.getOpcode() == Opcodes.FCMPG) {
					TransformationStatistics.transformedComparison();
					insertFloatComparisonG(in, mn.instructions);
				} else if (in.getOpcode() == Opcodes.FCMPL) {
					TransformationStatistics.transformedComparison();
					insertFloatComparisonL(in, mn.instructions);
				}
			}
			node = next;
		}
	}

	private void insertLongComparison(AbstractInsnNode position, InsnList list) {
		MethodInsnNode get = new MethodInsnNode(Opcodes.INVOKESTATIC,
		        Type.getInternalName(BooleanHelper.class), "longSub",
		        Type.getMethodDescriptor(Type.INT_TYPE, new Type[] { Type.LONG_TYPE,
		                Type.LONG_TYPE }), false);
		list.insert(position, get);
		list.remove(position);
	}

	private void insertFloatComparisonG(AbstractInsnNode position, InsnList list) {
		MethodInsnNode get = new MethodInsnNode(Opcodes.INVOKESTATIC,
		        Type.getInternalName(BooleanHelper.class), "floatSubG",
		        Type.getMethodDescriptor(Type.INT_TYPE, new Type[] { Type.FLOAT_TYPE,
		                Type.FLOAT_TYPE }), false);
		list.insert(position, get);
		list.remove(position);
	}

	private void insertFloatComparisonL(AbstractInsnNode position, InsnList list) {
		MethodInsnNode get = new MethodInsnNode(Opcodes.INVOKESTATIC,
				Type.getInternalName(BooleanHelper.class), "floatSubL",
				Type.getMethodDescriptor(Type.INT_TYPE, new Type[] { Type.FLOAT_TYPE,
						Type.FLOAT_TYPE }), false);
		list.insert(position, get);
		list.remove(position);
	}

	private void insertDoubleComparisonG(AbstractInsnNode position, InsnList list) {
		MethodInsnNode get = new MethodInsnNode(Opcodes.INVOKESTATIC,
		        Type.getInternalName(BooleanHelper.class), "doubleSubG",
		        Type.getMethodDescriptor(Type.INT_TYPE, new Type[] { Type.DOUBLE_TYPE,
		                Type.DOUBLE_TYPE }), false);
		list.insert(position, get);
		list.remove(position);
	}

	private void insertDoubleComparisonL(AbstractInsnNode position, InsnList list) {
		MethodInsnNode get = new MethodInsnNode(Opcodes.INVOKESTATIC,
				Type.getInternalName(BooleanHelper.class), "doubleSubL",
				Type.getMethodDescriptor(Type.INT_TYPE, new Type[] { Type.DOUBLE_TYPE,
						Type.DOUBLE_TYPE }), false);
		list.insert(position, get);
		list.remove(position);
	}

}