class PDFUtil constructor(val context: Context) {

    /**Dimension For A4 Size Paper (1 inch = 72 points)**/
    val PDF_PAGE_WIDTH = 595 //8.26 Inch
    val PDF_PAGE_HEIGHT = 842 //11.69 Inch

    /* Font Resource */
    val fontStrawberry = ResourcesCompat.getFont(context, R.font.goryeongstrawberry)  // Strawberry font


    // A4 Size Page Info
    val A4 = a4Paper()

    // Paint object to make a Text
    val title: Paint = Paint()  // Title paint, Goryoengstrawberry font


    // A4 Size Paper Initializer
    private fun a4Paper() : PdfDocument.PageInfo {

        // Page Information : Page's Width, Height, and PageNumber
        val myPageInfo: PdfDocument.PageInfo =
            PdfDocument.PageInfo.Builder(PDF_PAGE_WIDTH, PDF_PAGE_HEIGHT, 1).create()

        return myPageInfo
    }

    // Draw Title
    fun titleText(text : String, canvas: Canvas) {
        title.setTypeface(fontStrawberry)
        title.color = ContextCompat.getColor(context, R.color.orange_80)
        title.textSize = 16f
        title.textAlign = Paint.Align.CENTER

        // Draw Text
        canvas.drawText(text, (canvas.width / 2).toFloat(), (canvas.height / 2).toFloat(), title)

    }


    @Throws(IOException::class)
    fun savePdfFileExternalStorage(filename: String, document: PdfDocument, context : Context) {

        try {
            // First, creating External Storage Directory, and a file name,
            // Second, write our PDF file to that location.
            // Third, close file
            val dir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)
            val file = File(dir, filename)
            val fos = FileOutputStream(file)
            document.writeTo(fos)
            fos.close()

            // on below line we are displaying a toast message as PDF file generated..
            Toast.makeText(context, "PDF 파일이 다운로드 폴더에 저장되었습니다.", Toast.LENGTH_SHORT).show()
        } catch (e: Exception) {
            // below line is used
            // to handle error
            e.printStackTrace()

            // on below line we are displaying a toast message as fail to generate PDF
            Toast.makeText(context, "PDF파일 작성에 실패했습니다.", Toast.LENGTH_SHORT).show()
        }
    }

}