/*
 * Copyright (C) 2011-2016 Markus Junginger, greenrobot (http://greenrobot.org)
 *
 * This file is part of greenDAO Generator.
 *
 * greenDAO Generator is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * greenDAO Generator 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with greenDAO Generator.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.greenrobot.greendao.performance.target;

import java.lang.reflect.Array;

// XXX these should be changed to reflect the actual memory allocator we use.
// it looks like right now objects want to be powers of 2 minus 8
// and the array size eats another 4 bytes

/**
 * ArrayUtils contains some methods that you can call to find out
 * the most efficient increments by which to grow arrays.
 */
public class ArrayUtils
{
    private static Object[] EMPTY = new Object[0];
    private static final int CACHE_SIZE = 73;
    private static Object[] sCache = new Object[CACHE_SIZE];

    private ArrayUtils() { /* cannot be instantiated */ }

    public static int idealByteArraySize(int need) {
        for (int i = 4; i < 32; i++)
            if (need <= (1 << i) - 12)
                return (1 << i) - 12;

        return need;
    }

    public static int idealBooleanArraySize(int need) {
        return idealByteArraySize(need);
    }

    public static int idealShortArraySize(int need) {
        return idealByteArraySize(need * 2) / 2;
    }

    public static int idealCharArraySize(int need) {
        return idealByteArraySize(need * 2) / 2;
    }

    public static int idealIntArraySize(int need) {
        return idealByteArraySize(need * 4) / 4;
    }

    public static int idealFloatArraySize(int need) {
        return idealByteArraySize(need * 4) / 4;
    }

    public static int idealObjectArraySize(int need) {
        return idealByteArraySize(need * 4) / 4;
    }

    public static int idealLongArraySize(int need) {
        return idealByteArraySize(need * 8) / 8;
    }

    /**
     * Checks if the beginnings of two byte arrays are equal.
     *
     * @param array1 the first byte array
     * @param array2 the second byte array
     * @param length the number of bytes to check
     * @return true if they're equal, false otherwise
     */
    public static boolean equals(byte[] array1, byte[] array2, int length) {
        if (array1 == array2) {
            return true;
        }
        if (array1 == null || array2 == null || array1.length < length || array2.length < length) {
            return false;
        }
        for (int i = 0; i < length; i++) {
            if (array1[i] != array2[i]) {
                return false;
            }
        }
        return true;
    }

    /**
     * Returns an empty array of the specified type.  The intent is that
     * it will return the same empty array every time to avoid reallocation,
     * although this is not guaranteed.
     */
    public static <T> T[] emptyArray(Class<T> kind) {
        if (kind == Object.class) {
            return (T[]) EMPTY;
        }

        int bucket = ((System.identityHashCode(kind) / 8) & 0x7FFFFFFF) % CACHE_SIZE;
        Object cache = sCache[bucket];

        if (cache == null || cache.getClass().getComponentType() != kind) {
            cache = Array.newInstance(kind, 0);
            sCache[bucket] = cache;

            // Log.e("cache", "new empty " + kind.getName() + " at " + bucket);
        }

        return (T[]) cache;
    }

    /**
     * Checks that value is present as at least one of the elements of the array.
     * @param array the array to check in
     * @param value the value to check for
     * @return true if the value is present in the array
     */
    public static <T> boolean contains(T[] array, T value) {
        for (T element : array) {
            if (element == null) {
                if (value == null) return true;
            } else {
                if (value != null && element.equals(value)) return true;
            }
        }
        return false;
    }
}
