#! /usr/bin/env python3
import serial
import codecs

import argparse


serialdevice='/dev/ttyUSB0'



chars=" qwertzuiopü+asdfghjklöä#yxcvbnm,.-QWERTZUIOPÜ*ASDFGHJKLÖÄ'YXCVBNM;:_1234567890ß!\"§$%&/()=?°²³"



'''
Teilung 10: 65
Teilung 12: 78
Teilung 15: 97
'''

def main():
    parser = argparse.ArgumentParser(description='Send Textfile over serial')
    parser.add_argument('filename', help="file to print")
    parser.add_argument('-d', '--device', nargs='?', help="serial device name")
    parser.add_argument('-l', '--length', nargs='?', type=int, help="maximum line length")
    parser.add_argument('-x','--dryrun', action="store_true", help="do not send anything to printer")
    
    args = parser.parse_args()
    
    charsperline=65
    if args.length is not None:
        charsperline=int(args.length)
        print("args.length: "+str(args.length))
    print("Checking for maximum line length: "+str(charsperline))
        
    
    filename=args.filename
    if args.device is not None:
        serialdevice=args.device

    lines=[]

    with codecs.open(filename, encoding='utf-8') as file:
        lines=file.readlines()
        
    lines=[x.rstrip() for x in lines] # remove whitespaces and linebreaks
    
    for iline,line in enumerate(lines):
        if not set(line).issubset(chars):
            print(str(iline)+":"+str(line))
            print("Contains non printable characters")
            exit()
        if len(line)>charsperline:
            print(str(iline)+":"+str(line))
            print("Line is too long." +str(len(line))+">"+str(charsperline))
            exit()
            
    if (args.dryrun):
        print("Dry Run enabled. Exiting")
        exit()
        
    with serial.Serial(serialdevice, 9600, timeout=1) as ser:
        
        for line in lines:
            print(line)
            ser.write(line.encode())
            ser.write(b'\n')






if __name__ == "__main__":
    main()