package main

import (
	"fmt"
	"image/color"

	"codeberg.org/go-pdf/fpdf"
	"github.com/yeqown/go-qrcode/v2"
	"github.com/yeqown/go-qrcode/writer/standard"
)

// 1

var cols = 4
var rows = 7
var qrSize = 35
var offset = qrSize/2 + 5

func main() {
	qrc, err := qrcode.New("https://nanocat.net")
	if err != nil {
		fmt.Printf("could not generate QRCode: %v", err)
		return
	}

	b := newBWC()
	qrBytes := standard.NewWithWriter(&b,
		standard.WithBuiltinImageEncoder(standard.PNG_FORMAT),
		standard.WithCircleShape(),
		standard.WithFgGradient(&standard.LinearGradient{
			Stops: []standard.ColorStop{{
				T: 0.0,
				Color: color.RGBA{
					R: 255,
					G: 0,
					B: 0,
					A: 0,
				},
			}, {
				T: 1.0,
				Color: color.RGBA{
					R: 0,
					G: 255,
					B: 0,
					A: 0,
				},
			}},
			Angle: 45,
		}), standard.WithLogoImageFileJPEG("cat-pet-animal-domestic-104827.jpeg"),
	)

	// save file
	if err = qrc.Save(qrBytes); err != nil {
		fmt.Printf("could not save image: %v", err)
	}

	pdf := fpdf.New("P", "mm", "A4", "")
	pageWidth, pageHeight := pdf.GetPageSize()

	// register the qr
	pdf.RegisterImageOptionsReader("qr", fpdf.ImageOptions{
		ImageType:             "png",
		ReadDpi:               false,
		AllowNegativePosition: false,
	}, b)

	pdf.AddPage()
	pdf.SetFont("Arial", "B", 16)

	text := "foobar"
	textWidth := pdf.GetStringWidth(text)

	colWidth := pageWidth / float64(cols)
	rowHeight := pageHeight / float64(rows)

	for i := 0; i < rows; i++ {
		for j := 0; j < cols; j++ {
			pdf.Text(colWidth*float64(j)+colWidth/2-textWidth/2,
				rowHeight*float64(i)+rowHeight/2-float64(offset),
				text)

			pdf.Image("qr",
				colWidth*float64(j)+colWidth/2-float64(qrSize)/2, rowHeight*float64(i)+rowHeight/2+float64(offset),
				float64(qrSize), float64(qrSize),
				false, "tp", 0, "")

		}
	}

	err = pdf.OutputFileAndClose("hello.pdf")
	if err != nil {
		panic(err)
	}
	fmt.Println(pageWidth, pageHeight)
}