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/**
 * Copyright (C) 2010-2016 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.runtime;

import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import org.evosuite.runtime.instrumentation.InstrumentedClass;
import org.evosuite.runtime.instrumentation.RemoveFinalClassAdapter;
import org.mockito.asm.Opcodes;

/**
 * The content of arrays in reflection methods may differ between classloaders, therefore
 * we sort the output alphabetically
 * 
 * @author gordon
 *
 */
public class Reflection {

	private static  T[] sortArrayInPlace(T[] original) {
		List methods = Arrays.asList(original);
		Collections.sort(methods, new Comparator() {
			@Override
			public int compare(T o1, T o2) {
				return o1.toString().compareTo(o2.toString());
			}
		});
		
		methods.toArray(original);
		return original;
	}
	
	public static Annotation[] getAnnotations(Class clazz) throws SecurityException {
		return sortArrayInPlace(clazz.getAnnotations());
	}

	public static Class[] getClasses(Class clazz) throws SecurityException {
		return sortArrayInPlace(clazz.getClasses());
	}

	// TODO: Should return mocked methods?
	public static Method[] getMethods(Class clazz) throws SecurityException {
		return sortArrayInPlace(clazz.getMethods());
	}

	public static Field[] getFields(Class clazz) throws SecurityException {
		return sortArrayInPlace(clazz.getFields());
	}

	public static Constructor[] getConstructors(Class clazz) throws SecurityException {
		return sortArrayInPlace(clazz.getConstructors());
	}

	public static Class[] getInterfaces(Class clazz) throws SecurityException {
		return sortArrayInPlace(Arrays.stream(clazz.getInterfaces()).filter(c -> !c.equals(InstrumentedClass.class)).toArray(Class[]::new));
	}

	public static Annotation[] getDeclaredAnnotations(Class clazz) throws SecurityException {
		return sortArrayInPlace(clazz.getDeclaredAnnotations());
	}
	
	public static Class[] getDeclaredClasses(Class clazz) throws SecurityException {
		return sortArrayInPlace(clazz.getDeclaredClasses());
	}

	public static Method[] getDeclaredMethods(Class clazz) throws SecurityException {
		return sortArrayInPlace(clazz.getDeclaredMethods());
	}
	
	public static Field[] getDeclaredFields(Class clazz) throws SecurityException {
		return sortArrayInPlace(clazz.getDeclaredFields());
	}

	public static Constructor[] getDeclaredConstructors(Class clazz) throws SecurityException {
		return sortArrayInPlace(clazz.getDeclaredConstructors());
	}
	
	public static int getModifiers(Class clazz) {
		int modifier = clazz.getModifiers();
		if(RemoveFinalClassAdapter.finalClasses.contains(clazz.getCanonicalName())) {
			modifier = modifier | Opcodes.ACC_FINAL;
		}
		return modifier;
	}

	public static void setField(Field field, Object sourceObject, Object value) throws IllegalAccessException {
		if (field.getType().equals(int.class))
			field.setInt(sourceObject, getIntValue(value));
		else if (field.getType().equals(boolean.class))
			field.setBoolean(sourceObject, (Boolean) value);
		else if (field.getType().equals(byte.class))
			field.setByte(sourceObject, (byte) getIntValue(value));
		else if (field.getType().equals(char.class))
			field.setChar(sourceObject, getCharValue(value));
		else if (field.getType().equals(double.class))
			field.setDouble(sourceObject, getDoubleValue(value));
		else if (field.getType().equals(float.class))
			field.setFloat(sourceObject, getFloatValue(value));
		else if (field.getType().equals(long.class))
			field.setLong(sourceObject, getLongValue(value));
		else if (field.getType().equals(short.class))
			field.setShort(sourceObject, (short) getIntValue(value));
		else {
			field.set(sourceObject, value);
		}
	}

	private static int getIntValue(Object object) {
		if (object instanceof Number) {
			return ((Number) object).intValue();
		} else if (object instanceof Character) {
			return ((Character) object).charValue();
		} else
			return 0;
	}

	private static long getLongValue(Object object) {
		if (object instanceof Number) {
			return ((Number) object).longValue();
		} else if (object instanceof Character) {
			return ((Character) object).charValue();
		} else
			return 0L;
	}

	private static float getFloatValue(Object object) {
		if (object instanceof Number) {
			return ((Number) object).floatValue();
		} else if (object instanceof Character) {
			return ((Character) object).charValue();
		} else
			return 0F;
	}

	private static double getDoubleValue(Object object) {
		if (object instanceof Number) {
			return ((Number) object).doubleValue();
		} else if (object instanceof Character) {
			return ((Character) object).charValue();
		} else
			return 0.0;
	}

	private static char getCharValue(Object object) {
		if (object instanceof Character) {
			return ((Character) object).charValue();
		} else if (object instanceof Number) {
			return (char) ((Number) object).intValue();
		} else
			return '0';
	}

}