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/**
 * Copyright 2013 Joan Zapata
 *
 * This file is part of Android-pdfview.
 *
 * Android-pdfview 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.
 *
 * Android-pdfview 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 Android-pdfview.  If not, see .
 */
package com.joanzapata.pdfview.util;

import java.util.ArrayList;
import java.util.List;

public class ArrayUtils {

    private ArrayUtils() {
        // Prevents instantiation
    }

    /** Transforms (0,1,2,2,3) to (0,1,2,3) */
    public static int[] deleteDuplicatedPages(int[] pages) {
        List result = new ArrayList();
        int lastInt = -1;
        for (Integer currentInt : pages) {
            if (lastInt != currentInt) {
                result.add(currentInt);
            }
            lastInt = currentInt;
        }
        int[] arrayResult = new int[result.size()];
        for (int i = 0; i < result.size(); i++) {
            arrayResult[i] = result.get(i);
        }
        return arrayResult;
    }

    /** Transforms (0, 4, 4, 6, 6, 6, 3) into (0, 1, 1, 2, 2, 2, 3) */
    public static int[] calculateIndexesInDuplicateArray(int[] originalUserPages) {
        int[] result = new int[originalUserPages.length];
        if (originalUserPages.length == 0) {
            return result;
        }

        int index = 0;
        result[0] = originalUserPages[0];
        for (int i = 1; i < originalUserPages.length; i++) {
            if (originalUserPages[i] != originalUserPages[i - 1]) {
                index++;
            }
            result[i] = index;
        }

        return result;
    }

    public static String arrayToString(int[] array) {
        StringBuilder builder = new StringBuilder("[");
        for (int i = 0; i < array.length; i++) {
            builder.append(array[i]);
            if (i != array.length - 1) {
                builder.append(",");
            }
        }
        builder.append("]");
        return builder.toString();
    }
}