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/*
 * Copyright (c) 2022, 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.fiducial.qrcode;

import georegression.struct.point.Point2D_I32;

/**
 * Abstract class for creating qr codes. Contains the logic for rendering the QR Code but is missing
 * the actual renderer.
 *
 * @author Peter Abeles
 */
@SuppressWarnings({"NullAway.Init"})
public class QrCodeGenerator extends QrGeneratorBase {

	QrCode qr;

	public QrCodeGenerator( double markerWidth ) {
		super(markerWidth);
	}

	public QrCodeGenerator() {}

	/**
	 * Generates a QR Code with the specified message. An exception is thrown if the message is
	 * too long to be encoded.
	 */
	public QrCodeGenerator render( QrCode qr ) {
		initialize(qr);

		render.init();
		positionPattern(0, 0, qr.ppCorner);
		positionPattern((numModules - 7)*moduleWidth, 0, qr.ppRight);
		positionPattern(0, (numModules - 7)*moduleWidth, qr.ppDown);

		timingPattern(7*moduleWidth, 6*moduleWidth, moduleWidth, 0, numModules - 7*2);
		timingPattern(6*moduleWidth, 7*moduleWidth, 0, moduleWidth, numModules - 7*2);

		formatInformation();

		if (qr.version >= QrCode.VERSION_ENCODED_AT)
			versionInformation();

		// render alignment patterns

		int[] alignment = QrCode.VERSION_INFO[qr.version].alignment;
		for (int i = 0; i < alignment.length; i++) {
			int row = alignment[i];

			for (int j = 0; j < alignment.length; j++) {
				if (i == 0 && j == 0)
					continue;
				if (i == alignment.length - 1 && j == 0)
					continue;
				if (i == 0 && j == alignment.length - 1)
					continue;

				int col = alignment[j];
				alignmentPattern(col, row);
			}
		}

		if (renderData) {
			if (qr.rawbits.length != QrCode.VERSION_INFO[qr.version].codewords)
				throw new RuntimeException("Unexpected length of raw data.");

			// mark which modules can store data
			bitLocations = QrCodeCodeWordLocations.qrcode(qr.version).bits;

			int numBytes = bitLocations.size()/8;
			if (numBytes != qr.rawbits.length)
				throw new RuntimeException("Egads. unexpected length of qrcode raw data");

			// Render the output data
			renderData();
		}

		qr.bounds.set(0, 0, 0);
		qr.bounds.set(1, markerWidth, 0);
		qr.bounds.set(2, markerWidth, markerWidth);
		qr.bounds.set(3, 0, markerWidth);

		return this;
	}

	@SuppressWarnings("NullAway")
	protected void initialize( QrCode qr ) {
		this.qr = qr;
		this.numModules = QrCode.totalModules(qr.version);
		this.moduleWidth = markerWidth/numModules;
		this.bitLocations = null;
	}

	/**
	 * Renders the raw data bit output while applying the selected mask
	 */
	private void renderData() {
		QrCodeMaskPattern mask = qr.mask;
		int count = 0;

		int length = bitLocations.size() - bitLocations.size()%8;
		while (count < length) {
			int bits = qr.rawbits[count/8] & 0xFF;

			int N = Math.min(8, bitLocations.size() - count);

			for (int i = 0; i < N; i++) {
				Point2D_I32 coor = bitLocations.get(count + i);
				int value = mask.apply(coor.y, coor.x, ((bits >> i) & 0x01));
//				int value = ((bits >> i ) & 0x01);
				if (value > 0) {
					square(coor.y, coor.x);
				}
			}
			count += 8;
		}
	}

	static PackedBits32 formatInformationBits( QrCode qr ) {
		PackedBits32 bits = new PackedBits32(15);
		bits.data[0] = QrCodePolynomialMath.encodeFormatBits(qr.error, qr.mask.bits);
		bits.data[0] ^= QrCode.FORMAT_MASK;
		return bits;
	}

	private void formatInformation() {
		PackedBits32 bits = formatInformationBits(qr);
//		System.out.println("encoder format bits "+Integer.toBinaryString(bits.data[0]));

		for (int i = 0; i < 15; i++) {
			if (bits.get(i) == 0) {
				continue;
			}
			if (i < 6) {
				square(i, 8);
			} else if (i < 8) {
				square(i + 1, 8);
			} else if (i == 8) {
				square(8, 7);
			} else {
				square(8, 14 - i);
			}

			if (i < 8) {
				square(8, numModules - i - 1);
			} else {
				square(numModules - (15 - i), 8);
			}
		}
		square(numModules - 8, 8);
	}

	private void versionInformation() {
		PackedBits32 bits = new PackedBits32(18);
		bits.data[0] = QrCodePolynomialMath.encodeVersionBits(qr.version);
//		System.out.println("encoder version bits "+Integer.toBinaryString(bits.data[0]));

		for (int i = 0; i < 18; i++) {
			if (bits.get(i) == 0) {
				continue;
			}

			int row = i/3;
			int col = i%3;

			// top right
			square(row, numModules - 11 + col);
			// bottom left
			square(numModules - 11 + col, +row);
		}
	}

	private void alignmentPattern( int gridX, int gridY ) {
		double x = (gridX - 2)*moduleWidth;
		double y = (gridY - 2)*moduleWidth;

		render.square(x, y, moduleWidth*5, moduleWidth);
		render.square(x + moduleWidth*2, y + moduleWidth*2, moduleWidth);

		QrCode.Alignment a = qr.alignment.grow();
		a.moduleX = gridX;
		a.moduleY = gridY;
		a.pixel.setTo((gridX + 0.5)*moduleWidth, (gridY + 0.5)*moduleWidth);
	}
}