#!/usr/bin/env python3

from cairosvg import (svg2pdf, svg2png)
from qrr import qr_rechnung

def help(args):
    return '\n'.join([
        '{0}: Ungültige Eingabe',
        'Aufruf: {0} TEXTDATEI [SVG-ZIELDATEI]',
        'Alternativ kann die ZIELDATEI auch mit .pdf oder .png enden.'
        ]).format(args[0])


def main(args):
    try:
        textfile = args[1]
    except IndexError:
        print(help(args))
        return 1
    try:
        output_format = 'svg'
        svgfile = args[2]
        if svgfile[-4:] == '.svg':
            pass
        elif svgfile[-4:] == '.png':
            svgfile = svgfile[:-4]+'.svg'
            output_format = 'png'

        elif svgfile[-4:] == '.pdf':
            svgfile = svgfile[:-4]+'.svg'
            output_format = 'pdf'
        else:
            svgfile += '.svg'
    except IndexError:
        try:
            assert textfile[-4:] == '.txt'
            svgfile = textfile[:-4]+'.svg'
        except AssertionError:
            print(help(args))
            return 1
    try:
        x = qr_rechnung(textfile=textfile)
        x.write_file(svgfile, force=False)
    except (PermissionError, FileNotFoundError) as e:
        print(e)
        return 1
    if output_format == 'svg':
        return 0
    elif output_format == 'png':
        svg2png(url=svgfile, write_to=svgfile[:-4]+'.png', dpi=600)
        return 0
    elif output_format == 'pdf':
        svg2pdf(url=svgfile, write_to=svgfile[:-4]+'.pdf')
        return 0
    else:
        print(f"ERROR: Unbekanntes Output_format: {output_format}")
        return 1


if __name__ == '__main__':
    import sys
    sys.exit(main(sys.argv))