package com.adins.mss.base.receipt;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.view.View;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;

import java.util.EnumMap;
import java.util.Map;

import static android.graphics.Color.BLACK;
import static android.graphics.Color.WHITE;

public class Barcode extends View {

    public Barcode(Context context) {
        super(context);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        //EMPTY
    }

    public static Bitmap encode(String contents, BarcodeFormat format, int img_width, int img_height) throws WriterException
    {
        if (contents == null) {
            return null;
        }
        Map<EncodeHintType, Object> hints = null;
        String encoding = guessAppropriateEncoding(contents);
        if (encoding != null) {
            hints = new EnumMap<>(EncodeHintType.class);
            hints.put(EncodeHintType.CHARACTER_SET, encoding);
        }
        MultiFormatWriter writer = new MultiFormatWriter();
        BitMatrix result;
        try {
            result = writer.encode(contents, format, img_width, img_height, hints);
        } catch (IllegalArgumentException iae) {
            // Unsupported format
            return null;
        }
        int width = result.getWidth();
        int height = result.getHeight();
        int[] pixels = new int[width * height];
        for (int y = 0; y < height; y++) {
            int offset = y * width;
            for (int x = 0; x < width; x++) {
                pixels[offset + x] = result.get(x, y) ? BLACK : WHITE;
            }
        }

        Bitmap bitmap = Bitmap.createBitmap(width, height,
                Bitmap.Config.ARGB_8888);
        bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
        return bitmap;
    }

    private static String guessAppropriateEncoding(CharSequence contents) {
        // Very crude at the moment
        for (int i = 0; i < contents.length(); i++) {
            if (contents.charAt(i) > 0xFF) {
                return "UTF-8";
            }
        }
        return null;
    }
}
