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package net.mostlyoriginal.api.utils;

import com.badlogic.gdx.maps.tiled.TiledMapTileLayer;
import com.badlogic.gdx.utils.Array;

/**
 * Creates a mask based on tiles with a certain propertyKey.
 * 
 * Useful for creating a mask for collidable parts of the map.
 *
 * @author Daan van Yperen
 */
public class MapMask {

    public final boolean[][] v;
    public final int height;
    public final int width;
    private final int tileWidth;
    private final int tileHeight;
    private final Array layers;
    private final String propertyKey;

    public MapMask(int height, int width, int tileWidth, int tileHeight) {
        this(height,width,tileWidth,tileHeight,null,null);
    }

    public MapMask(int height, int width, int tileWidth, int tileHeight, Array layers, String propertyKey) {
        this.height = height;
        this.width = width;
        this.tileWidth = tileWidth;
        this.tileHeight = tileHeight;
        v = new boolean[height][width];
        this.layers = layers;
        this.propertyKey = propertyKey;
        refresh();
    }

    public void refresh() {
        if ( layers != null )
        generate(this.layers, this.propertyKey);
    }

    public void set(final int x, final int y, boolean value) {
        if (x >= width || x < 0 || y < 0 || y >= height) return;
        v[y][x] = value;
    }

    /**
     * @param x grid coordinates
     * @param y grid coordinates.
     * @return TRUE when property found at TILE coordinates, FALSE if otherwise or out of bounds.
     */
    public boolean atGrid(final int x, final int y, boolean outOfBoundsResult) {
        if (x >= width || x < 0 || y < 0 || y >= height) return outOfBoundsResult;
        return v[y][x];
    }

    /**
     * @param x
     * @param y
     * @return TRUE when property found at PIXEL coordinates.
     */
    public boolean atScreen(final int x, final int y, boolean outOfBoundsResult) {
        return atGrid((int) (x / tileWidth), (int) (y / tileHeight), outOfBoundsResult);
    }

    public boolean atScreen(final float x, final float y, boolean outOfBoundsResult) {
        return atGrid((int) ((int) x / tileWidth), (int) ((int) y / tileHeight), outOfBoundsResult);
    }

    public void generate(Array layers, String propertyKey) {
        clear();
        for (TiledMapTileLayer layer : layers) {
            for (int ty = 0; ty < height; ty++) {
                for (int tx = 0; tx < width; tx++) {
                    final TiledMapTileLayer.Cell cell = layer.getCell(tx, ty);
                    if (cell != null && cell.getTile() != null && cell.getTile().getProperties().containsKey(propertyKey)) {
                        v[ty][tx] = true;
                    }
                }
            }
        }
    }

    public void clear() {
        for (int ty = 0; ty < height; ty++) {
            for (int tx = 0; tx < width; tx++) {
                v[ty][tx] = false;
            }
        }
    }
}