package thridparty;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.Writer;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import com.google.zxing.qrcode.encoder.ByteMatrix;
import com.google.zxing.qrcode.encoder.Encoder;
import com.google.zxing.qrcode.encoder.QRCode;
import java.util.Map;

/**
 * Original class: com.google.zxing.qrcode.QRCodeWriter
 *
 * @Author dswitkin@google.com (Daniel Switkin)
 * @License Apache License Version 2.0
 *
 * Updated by Mara
 * Update Date 2019-9-26
 * ===> Original class is final so I have to modify it by copying all codes here
 */
public class QRCodeWriter implements Writer {

    protected static final int QUIET_ZONE_SIZE = 4;
    protected QRCode code;
    protected int leftPadding, topPadding;

    @Override
    public BitMatrix encode(String contents, BarcodeFormat format, int width, int height)
            throws WriterException {

        return encode(contents, format, width, height, null);
    }

    @Override
    public BitMatrix encode(String contents,
            BarcodeFormat format,
            int width,
            int height,
            Map<EncodeHintType, ?> hints) throws WriterException {

        if (contents.isEmpty()) {
            throw new IllegalArgumentException("Found empty contents");
        }

        if (format != BarcodeFormat.QR_CODE) {
            throw new IllegalArgumentException("Can only encode QR_CODE, but got " + format);
        }

        if (width < 0 || height < 0) {
            throw new IllegalArgumentException("Requested dimensions are too small: " + width + 'x'
                    + height);
        }

        ErrorCorrectionLevel errorCorrectionLevel = ErrorCorrectionLevel.L;
        int quietZone = QUIET_ZONE_SIZE;
        if (hints != null) {
            if (hints.containsKey(EncodeHintType.ERROR_CORRECTION)) {
                errorCorrectionLevel = ErrorCorrectionLevel.valueOf(hints.get(EncodeHintType.ERROR_CORRECTION).toString());
            }
            if (hints.containsKey(EncodeHintType.MARGIN)) {
                quietZone = Integer.parseInt(hints.get(EncodeHintType.MARGIN).toString());
            }
        }

        code = Encoder.encode(contents, errorCorrectionLevel, hints);
        return renderResult(width, height, quietZone);
    }

    // Note that the input matrix uses 0 == white, 1 == black, while the output matrix uses
    // 0 == black, 255 == white (i.e. an 8 bit greyscale bitmap).
    public BitMatrix renderResult(int width, int height, int quietZone) {
        ByteMatrix input = code.getMatrix();
        if (input == null) {
            throw new IllegalStateException();
        }
        int inputWidth = input.getWidth();
        int inputHeight = input.getHeight();
        int qrWidth = inputWidth + (quietZone * 2);
        int qrHeight = inputHeight + (quietZone * 2);
        int outputWidth = Math.max(width, qrWidth);
        int outputHeight = Math.max(height, qrHeight);

        int multiple = Math.min(outputWidth / qrWidth, outputHeight / qrHeight);
        // Padding includes both the quiet zone and the extra white pixels to accommodate the requested
        // dimensions. For example, if input is 25x25 the QR will be 33x33 including the quiet zone.
        // If the requested size is 200x160, the multiple will be 4, for a QR of 132x132. These will
        // handle all the padding from 100x100 (the actual QR) up to 200x160.
        leftPadding = (outputWidth - (inputWidth * multiple)) / 2;
        topPadding = (outputHeight - (inputHeight * multiple)) / 2;

        BitMatrix output = new BitMatrix(outputWidth, outputHeight);

        for (int inputY = 0, outputY = topPadding; inputY < inputHeight; inputY++, outputY += multiple) {
            // Write the contents of this row of the barcode
            for (int inputX = 0, outputX = leftPadding; inputX < inputWidth; inputX++, outputX += multiple) {
                if (input.get(inputX, inputY) == 1) {
                    output.setRegion(outputX, outputY, multiple, multiple);
                }
            }
        }

        return output;
    }

    /**
     * get/set -- to help to expose the values
     */
    public QRCode getCode() {
        return code;
    }

    public void setCode(QRCode code) {
        this.code = code;
    }

    public int getLeftPadding() {
        return leftPadding;
    }

    public void setLeftPadding(int leftPadding) {
        this.leftPadding = leftPadding;
    }

    public int getTopPadding() {
        return topPadding;
    }

    public void setTopPadding(int topPadding) {
        this.topPadding = topPadding;
    }

}
