/*
 * Copyright 2014 MovingBlocks
 *
 * 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 org.terasology.world.generation.facets.base;

import org.terasology.math.geom.Rect2i;
import org.terasology.math.Region3i;
import org.terasology.world.generation.Border3D;
import org.terasology.world.generation.WorldFacet2D;

/**
 */
public class BaseFacet2D implements WorldFacet2D {

    private Rect2i worldRegion;
    private Rect2i relativeRegion;

    public BaseFacet2D(Region3i targetRegion, Border3D border) {
        worldRegion = border.expandTo2D(targetRegion);
        relativeRegion = border.expandTo2D(targetRegion.size());
    }

    @Override
    public final Rect2i getWorldRegion() {
        return worldRegion;
    }

    @Override
    public final Rect2i getRelativeRegion() {
        return relativeRegion;
    }

    protected final int getRelativeIndex(int x, int z) {
        if (!relativeRegion.contains(x, z)) {
            throw new IllegalArgumentException(String.format("Out of bounds: (%d, %d) for region %s", x, z, relativeRegion.toString()));
        }
        return x - relativeRegion.minX() + relativeRegion.sizeX() * (z - relativeRegion.minY());
    }

    protected final int getWorldIndex(int x, int z) {
        if (!worldRegion.contains(x, z)) {
            throw new IllegalArgumentException(String.format("Out of bounds: (%d, %d) for region %s", x, z, worldRegion.toString()));
        }
        return x - worldRegion.minX() + worldRegion.sizeX() * (z - worldRegion.minY());
    }
}