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

import argparse


serialdevice='/dev/ttyUSB0'



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



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('-w', '--wait', nargs='?', type=int, help="wait after x characters")
    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))
    
    waitafter=0
    if args.wait is not None:
        waitafter=int(args.wait)
        print("Waiting after every "+str(charsperline)+" characters sent")
        
    
    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
    
    lines=[x.replace("´", "´ ") for x in lines] # add space to chars where printer is not advancing
    lines=[x.replace("`", "` ") for x in lines] # add space to chars where printer is not advancing
    
    
    
    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")
        
        
    with serial.Serial(serialdevice, 9600, timeout=1) as ser:
        
        charssent=0
        for iline,line in enumerate(lines):
            if waitafter>0 and charssent>waitafter:
                input("Press Enter to continue...")
                charssent=0
            print(str(iline)+"/"+str(len(lines))+" ("+str(charssent)+")"+":"+str(line))
            charssent+=len(line)
            if (not args.dryrun):
                ser.write(line.encode())
                ser.write(b'\n')






if __name__ == "__main__":
    main()