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/*
 * Copyright (c) 2021, Peter Abeles. All Rights Reserved.
 *
 * This file is part of BoofCV (http://boofcv.org).
 *
 * 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 boofcv.alg.drawing;

import boofcv.abst.distort.FDistort;
import boofcv.alg.misc.ImageMiscOps;
import boofcv.core.image.ConvertImage;
import boofcv.struct.image.GrayF32;
import boofcv.struct.image.GrayU8;
import georegression.struct.point.Point2D_F64;

/**
 * Rendering engine for fiducials into a gray scale image.
 *
 * @author Peter Abeles
 */
public class FiducialImageEngine extends FiducialRenderEngine {
	protected GrayU8 gray = new GrayU8(1, 1);

	// number of pixels in the border
	private int borderPixels;

	// value of the two color squares
	private int white = 255;
	private int black = 0;

	// What color it will draw shapes with
	private int drawColor = black;

	/**
	 * Specifies image size and the border.
	 *
	 * @param borderPixels size of white border around document
	 * @param markerPixels size of workable region inside the document
	 */
	public void configure( int borderPixels, int markerPixels ) {
		this.borderPixels = borderPixels;

		int width = markerPixels + 2*borderPixels;
		gray.reshape(width, width);
	}

	public void configure( int borderPixels, int markerWidth, int markerHeight ) {
		this.borderPixels = borderPixels;

		int width = markerWidth + 2*borderPixels;
		int height = markerHeight + 2*borderPixels;
		gray.reshape(width, height);
	}

	@Override
	public void init() {
		ImageMiscOps.fill(gray, white);
	}

	@Override public void setGray( double value ) {
		drawColor = (int)(255*value);
	}

	@Override
	public void circle( double cx, double cy, double radius ) {
		int x0 = borderPixels + (int)Math.round(cx - radius);
		int y0 = borderPixels + (int)Math.round(cy - radius);
		int x1 = borderPixels + (int)Math.round(cx + radius) + 1;
		int y1 = borderPixels + (int)Math.round(cy + radius) + 1;

		// border adjusted center
		double bcx = borderPixels + cx;
		double bcy = borderPixels + cy;

		// bound it inside the image
		x0 = Math.max(0, x0);
		y0 = Math.max(0, y0);
		x1 = Math.min(gray.width, x1);
		y1 = Math.min(gray.height, y1);

		// Brute force circle filling algorithm
		double r2 = radius*radius;
		for (int y = y0; y < y1; y++) {
			double dy = y - bcy;
			for (int x = x0; x < x1; x++) {
				double dx = x - bcx;
				if (dx*dx + dy*dy <= r2)
					gray.unsafe_set(x, y, drawColor);
			}
		}
	}

	@Override
	public void rectangle( double x0, double y0, double x1, double y1 ) {
		int pixelX0 = borderPixels + (int)(x0 + 0.5);
		int pixelY0 = borderPixels + (int)(y0 + 0.5);
		int pixelX1 = borderPixels + (int)(x1 + 0.5);
		int pixelY1 = borderPixels + (int)(y1 + 0.5);

		ImageMiscOps.fillRectangle(gray, drawColor, pixelX0, pixelY0, pixelX1 - pixelX0, pixelY1 - pixelY0);
	}

	@Override
	public void square( double x0, double y0, double width0, double thickness ) {

		int X0 = borderPixels + (int)(x0 + 0.5);
		int Y0 = borderPixels + (int)(y0 + 0.5);
		int WIDTH = (int)(width0 + 0.5);
		int THICKNESS = (int)(thickness + 0.5);

		ImageMiscOps.fillRectangle(gray, drawColor, X0, Y0, WIDTH, THICKNESS);
		ImageMiscOps.fillRectangle(gray, drawColor, X0, Y0 + WIDTH - THICKNESS, WIDTH, THICKNESS);
		ImageMiscOps.fillRectangle(gray, drawColor, X0, Y0 + THICKNESS, THICKNESS, WIDTH - THICKNESS*2);
		ImageMiscOps.fillRectangle(gray, drawColor, X0 + WIDTH - THICKNESS, Y0 + THICKNESS, THICKNESS, WIDTH - THICKNESS*2);
	}

	@Override
	public void draw( GrayU8 image, double x0, double y0, double x1, double y1 ) {
		int X0 = borderPixels + (int)(x0 + 0.5);
		int Y0 = borderPixels + (int)(y0 + 0.5);
		int X1 = borderPixels + (int)(x1 + 0.5);
		int Y1 = borderPixels + (int)(y1 + 0.5);

		GrayU8 out = new GrayU8(X1 - X0, Y1 - Y0);
		new FDistort(image, out).scale().apply();

		gray.subimage(X0, Y0, X1, Y1).setTo(out);
	}

	@Override
	public void inputToDocument( double x, double y, Point2D_F64 document ) {
		document.x = x + borderPixels;
		document.y = y + borderPixels;
	}

	public int getBorderPixels() {
		return borderPixels;
	}

	public GrayU8 getGray() {
		return gray;
	}

	public GrayF32 getGrayF32() {
		GrayF32 out = new GrayF32(gray.width, gray.height);
		ConvertImage.convert(gray, out);
		return out;
	}

	public int getWhite() {
		return white;
	}

	public void setWhite( int white ) {
		this.white = white;
	}

	public int getBlack() {
		return black;
	}

	public void setBlack( int black ) {
		this.black = black;
	}
}