/**
 * 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.assertion;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Field;

import org.evosuite.TestGenerationContext;
import org.evosuite.testcase.TestCase;
import org.evosuite.testcase.execution.CodeUnderTestException;
import org.evosuite.testcase.execution.Scope;
import org.evosuite.utils.NumberFormatter;

public class PrimitiveFieldAssertion extends Assertion {

	private static final long serialVersionUID = 2827276810722210456L;

	protected transient Field field;

	/**
	 * <p>
	 * Getter for the field <code>field</code>.
	 * </p>
	 * 
	 * @return a {@link java.lang.reflect.Field} object.
	 */
	public Field getField() {
		return field;
	}

	public void setField(Field field) {
		this.field = field;
	}

	/** {@inheritDoc} */
	@Override
	public String getCode() {
		if (value == null) {
			return "assertNull(" + source.getName() + "." + field.getName() + ");";
		} else if (value.getClass().equals(Long.class)) {
			return "assertEquals(" + NumberFormatter.getNumberString(value) + ", "
			        + source.getName() + "." + field.getName() + ");";
		} else if (value.getClass().equals(Float.class)) {
			return "assertEquals(" + NumberFormatter.getNumberString(value) + ", "
			        + source.getName() + "." + field.getName() + ", 0.01F);";
		} else if (value.getClass().equals(Double.class)) {
			return "assertEquals(" + NumberFormatter.getNumberString(value) + ", "
			        + source.getName() + "." + field.getName() + ", 0.01D);";
		} else if (value.getClass().equals(Character.class)) {
			return "assertEquals(" + NumberFormatter.getNumberString(value) + ", "
			        + source.getName() + "." + field.getName() + ");";
		} else if (value.getClass().equals(String.class)) {
			return "assertEquals(" + NumberFormatter.getNumberString(value) + ", "
			        + source.getName() + "." + field.getName() + ");";
		} else
			return "assertEquals(" + NumberFormatter.getNumberString(value) + ", "
			        + source.getName() + "." + field.getName() + ");";
	}

	/** {@inheritDoc} */
	@Override
	public Assertion copy(TestCase newTestCase, int offset) {
		PrimitiveFieldAssertion s = new PrimitiveFieldAssertion();
		s.source = newTestCase.getStatement(source.getStPosition() + offset).getReturnValue();
		s.value = value;
		s.field = field;
		s.comment = comment;
		s.killedMutants.addAll(killedMutants);
		return s;
	}

	/** {@inheritDoc} */
	@Override
	public boolean evaluate(Scope scope) {
		try {
			Object obj = source.getObject(scope);
			if (obj != null) {
				try {
					Object val = field.get(obj);
					if (val != null)
						return val.equals(value);
					else
						return value == null;
				} catch (Exception e) {
					return true;
				}
			} else
				return true;
		} catch (CodeUnderTestException e) {
			throw new UnsupportedOperationException();
		}
	}

	/** {@inheritDoc} */
	@Override
	public int hashCode() {
		final int prime = 31;
		int result = super.hashCode();
		result = prime * result + ((field == null) ? 0 : field.hashCode());
		return result;
	}

	/** {@inheritDoc} */
	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (!super.equals(obj))
			return false;
		if (getClass() != obj.getClass())
			return false;
		PrimitiveFieldAssertion other = (PrimitiveFieldAssertion) obj;
		if (field == null) {
			if (other.field != null)
				return false;
		} else if (!field.equals(other.field))
			return false;
		return true;
	}

	private void writeObject(ObjectOutputStream oos) throws IOException {
		oos.defaultWriteObject();
		// Write/save additional fields
		oos.writeObject(field.getDeclaringClass().getName());
		oos.writeObject(field.getName());
	}

	// assumes "static java.util.Date aDate;" declared
	private void readObject(ObjectInputStream ois) throws ClassNotFoundException,
	        IOException {
		ois.defaultReadObject();

		// Read/initialize additional fields
		Class<?> methodClass = TestGenerationContext.getInstance().getClassLoaderForSUT().loadClass((String) ois.readObject());
		String fieldName = (String) ois.readObject();

		try {
			field = methodClass.getField(fieldName);
		} catch (SecurityException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (NoSuchFieldException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}