package main

import (
	"flag"
	"fmt"
	"os"

	"code.ppl.town/justin/qr_labels/qr_labels"
)

var flagLabel string
var flagQRCode string
var flagQRSize float64
var flagRows, flagCols uint
var flagFontSize float64
var flagFont string
var flagFontStyle string
var flagBorders bool = true
var flagFilename string
var flagCodeIsLabel bool

func main() {

	flag.StringVar(&flagLabel, "label", "", "label (printed above QR code)")
	flag.StringVar(&flagQRCode, "code", "", "string to turn into a QR code (URL, text etc)")
	flag.Float64Var(&flagQRSize, "size", 50.0, "size of the QR code")

	flag.UintVar(&flagRows, "rows", 4, "number of rows on the page")
	flag.UintVar(&flagCols, "cols", 3, "number of columns on the page")
	flag.StringVar(&flagFont, "font", "Helvetica", "name of the font")
	flag.Float64Var(&flagFontSize, "font-size", 24.0, "font-size, in pts")
	flag.StringVar(&flagFontStyle, "font-style", "", "font style, combine 'B', 'U', 'S', 'I' characters")
	flag.BoolVar(&flagBorders, "borders", false, "print borders between labels")
	flag.StringVar(&flagFilename, "output", "", "filename to write the PDF")

	flag.BoolVar(&flagCodeIsLabel, "code-is-label", false, "use the -code as the -label")

	flag.Parse()

	if flagFilename == "" {
		fmt.Println("you need to supply an -output filename")
		os.Exit(1)
	}

	if flagQRCode == "" {
		fmt.Println("you need to supply a QR -code string")
		os.Exit(1)
	}

	if flagCodeIsLabel && flagLabel != "" {
		fmt.Println("you cannot use both -code-is-label and -label")
		os.Exit(1)
	}

	if flagCodeIsLabel {
		flagLabel = flagQRCode
	}

	f, err := os.Create(flagFilename)
	if err != nil {
		fmt.Printf("failed to create output file: %s\n", err.Error())
		os.Exit(1)
	}

	err = qr_labels.GeneratePage(f,
		flagQRCode,
		flagLabel,
		qr_labels.WithQRSize(flagQRSize),
		qr_labels.WithFont(flagFont, flagFontSize, flagFontStyle),
		qr_labels.WithBorders(flagBorders),
		qr_labels.WithGrid(int(flagRows), int(flagCols)),
	)

	if err != nil {
		fmt.Printf("could not generate pdf: %s\n", err.Error())
		os.Exit(1)
	}

}