/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.inputmethod.latin.utils;

import java.util.Arrays;

public final class CoordinateUtils {
    private static final int INDEX_X = 0;
    private static final int INDEX_Y = 1;
    private static final int ELEMENT_SIZE = INDEX_Y + 1;

    private CoordinateUtils() {
        // This utility class is not publicly instantiable.
    }

    public static int[] newInstance() {
        return new int[ELEMENT_SIZE];
    }

    public static int x(final int[] coords) {
        return coords[INDEX_X];
    }

    public static int y(final int[] coords) {
        return coords[INDEX_Y];
    }

    public static void set(final int[] coords, final int x, final int y) {
        coords[INDEX_X] = x;
        coords[INDEX_Y] = y;
    }

    public static void copy(final int[] destination, final int[] source) {
        destination[INDEX_X] = source[INDEX_X];
        destination[INDEX_Y] = source[INDEX_Y];
    }

    public static int[] newCoordinateArray(final int arraySize) {
      return new int[ELEMENT_SIZE * arraySize];
    }

    public static int[] newCoordinateArray(final int arraySize,
        final int defaultX, final int defaultY) {
      final int[] result = new int[ELEMENT_SIZE * arraySize];
      for (int i = 0; i < arraySize; ++i) {
        setXYInArray(result, i, defaultX, defaultY);
      }
      return result;
    }

    public static int xFromArray(final int[] coordsArray, final int index) {
        return coordsArray[ELEMENT_SIZE * index + INDEX_X];
    }

    public static int yFromArray(final int[] coordsArray, final int index) {
        return coordsArray[ELEMENT_SIZE * index + INDEX_Y];
    }

    public static int[] coordinateFromArray(final int[] coordsArray, final int index) {
        final int baseIndex = ELEMENT_SIZE * index;
        return Arrays.copyOfRange(coordsArray, baseIndex, baseIndex + ELEMENT_SIZE);
    }

    public static void setXYInArray(final int[] coordsArray, final int index,
            final int x, final int y) {
        final int baseIndex = ELEMENT_SIZE * index;
        coordsArray[baseIndex + INDEX_X] = x;
        coordsArray[baseIndex + INDEX_Y] = y;
    }

    public static void setCoordinateInArray(final int[] coordsArray, final int index,
            final int[] coords) {
        final int baseIndex = ELEMENT_SIZE * index;
        coordsArray[baseIndex + INDEX_X] = coords[INDEX_X];
        coordsArray[baseIndex + INDEX_Y] = coords[INDEX_Y];
    }

    public static void copyArray(final int[] destination, final int[] source) {
        System.arraycopy(source, 0, destination, 0, source.length);
    }
}