package main

import (
	"fmt"
	"image"
	_ "image/png" // Required to decode PNG files
	"log"
    "flag"
	"os"

	"github.com/makiuchi-d/gozxing"
	"github.com/makiuchi-d/gozxing/qrcode"
)

func main() {
    input := flag.String("input", "qrcode.png", "Input filename for QR code")
    flag.Parse()

	// Open the PNG file
	file, err := os.Open(*input)
	if err != nil {
		log.Fatal(err)
	}
	defer file.Close()

	// Decode the image
	img, _, err := image.Decode(file)
	if err != nil {
		log.Fatal(err)
	}

	// Convert image to BinaryBitmap
	bmp, err := gozxing.NewBinaryBitmapFromImage(img)
	if err != nil {
		log.Fatal(err)
	}

	// Prepare a QR code reader
	reader := qrcode.NewQRCodeReader()

	// Decode the QR code
	result, err := reader.Decode(bmp, nil)
	if err != nil {
		log.Fatal(err)
	}

	// Print the decoded content
	fmt.Println("Decoded QR code:", result.GetText())
}