/**
 * Copyright (C) 2010-2017 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 <http://www.gnu.org/licenses/>.
 */
package org.evosuite.instrumentation;

import java.io.File;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.evosuite.Properties;
import org.evosuite.classpath.ResourceList;
import org.evosuite.utils.FileIOUtils;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Testing might require adapting function signatures, for example Object
 * classes.
 * 
 * @author Gordon Fraser
 */
public class ObjectSignatureAdapter extends ClassVisitor {

	/** Constant <code>logger</code> */
	protected static final Logger logger = LoggerFactory.getLogger(ObjectSignatureAdapter.class);

	private final String className;

	private boolean exclude = false;

	private Map<String, String> descriptors = new HashMap<String, String>();

	/**
	 * <p>
	 * Constructor for ObjectSignatureAdapter.
	 * </p>
	 * 
	 * @param visitor
	 *            a {@link org.objectweb.asm.ClassVisitor} object.
	 * @param className
	 *            a {@link java.lang.String} object.
	 */
	public ObjectSignatureAdapter(ClassVisitor visitor, String className) {
		super(Opcodes.ASM5, visitor);

		this.className = ResourceList.getClassNameFromResourcePath(className);

		if (!(this.className.startsWith(Properties.PROJECT_PREFIX))
		        && !(this.className.startsWith(Properties.TARGET_CLASS_PREFIX))) {
			exclude = true;
		} else {
			exclude = false;

			// Initialize descriptors
			// mutation-report/className.obj contains method signatures
			File file = new File(Properties.OUTPUT_DIR + "/" + className + ".obj");
			List<String> lines = FileIOUtils.readFile(file);
			descriptors = new HashMap<String, String>();
			for (String line : lines) {
				line = line.trim();
				// Skip comments
				if (line.startsWith("#"))
					continue;

				String[] parameters = line.split(",");
				if (parameters.length == 2) {
					descriptors.put(parameters[0], parameters[1]);
					logger.info("Adding descriptor: " + parameters[1]);
				} else if (parameters.length == 3) {
					// TODO: Handle signature
					descriptors.put(parameters[0], parameters[1]);
				}
			}
		}
	}

	/** {@inheritDoc} */
	@Override
	public MethodVisitor visitMethod(int methodAccess, String name, String descriptor,
	        String signature, String[] exceptions) {

		if (!exclude) {
			// If we have a signature for this method:
			if (descriptors.containsKey(name + descriptor)) {
				// descriptor = Type.getMethodDescriptor(arg0, arg1);
				// signature = Type.getMethodSignature(arg0, arg1);
				logger.info("Changing descriptor from " + descriptor + " to "
				        + descriptors.get(name + descriptor));
				descriptor = descriptors.get(name + descriptor);
			} else {
				logger.info("Couldn't find descriptor from " + name + descriptor);
			}
		}
		MethodVisitor mv = super.visitMethod(methodAccess, name, descriptor, signature,
		                                     exceptions);
		mv = new ObjectCallAdapter(mv, descriptors);

		return mv;
	}
}