#!/usr/bin/env python

# Modified by Stephen Stebbing to upload source code

# ESP8266 luatool
# Author e-mail: 4ref0nt@gmail.com
# Site: http://esp8266.ru
# Contributions from: https://github.com/sej7278
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
# Street, Fifth Floor, Boston, MA 02110-1301 USA.

import sys
import serial
from time import sleep
import argparse

version="0.6.1"

def writeln(data, check = 1):
    if s.inWaiting() > 0:
       s.flushInput()
    if len( data ) > 0:
        sys.stdout.write("\r\n->")
        sys.stdout.write(data.split("\r")[0])
    s.write(data)
    sleep(0.3)
    if check > 0 :
       line = ''
       char = ''
       while char != chr(62) : # '>'
           char = s.read(1)
           if char == '' :
               raise Exception('No proper answer from MCU')
           if char == chr(13) or char == chr(10) :
              if line != '':
                 if line+'\r' == data :
                    sys.stdout.write(" -> ok")
                 else :
                    if line[:4] == "lua:" :
                       sys.stdout.write("\r\n\r\nLua ERROR: %s" % line)
                       raise Exception('ERROR from Lua interpreter\r\n\r\n')
                    else :
                       data = data.split("\r")[0]
                       sys.stdout.write("\r\n\r\nERROR")
                       sys.stdout.write("\r\n send string    : '%s'" % data)
                       sys.stdout.write("\r\n expected echo  : '%s'" % data)
                       sys.stdout.write("\r\n but got answer : '%s'" % line)
                       sys.stdout.write("\r\n\r\n")
                       raise Exception('Error sending data to MCU\r\n\r\n')
                 line = ''
           else :
              line += char
    else:
       sys.stdout.write(" -> send without check")

def writer(data):
    writeln( data +"\r")


if __name__ == '__main__':
    # parse arguments or use defaults
    parser = argparse.ArgumentParser(description='ESP8266 Lua script uploader.')
    parser.add_argument('-p', '--port',    default='/dev/ttyUSB0', help='Device name, default /dev/ttyUSB0')
    parser.add_argument('-b', '--baud',    default=9600,           help='Baudrate, default 9600')
    parser.add_argument('-f', '--src',     default='main.lua',     help='Source file on computer, default main.lua')
    parser.add_argument('-v', '--verbose', action='store_true',    help="Show progress messages.")
    args = parser.parse_args()

    # open source file for reading
    try:
        f = open(args.src,"rt")
    except:
        sys.stderr.write("Could not open input file \"%s\"\n" % args.src)
        sys.exit(1)

    # open serial port
    try:
        s = serial.Serial(args.port, args.baud)
    except:
        sys.stderr.write("Could not open port %s\n" % (args.port))
        sys.exit(1)

    # set serial timeout
    if args.verbose: sys.stderr.write("Upload starting\r\n")
    s.timeout = 3
    if args.verbose: sys.stderr.write("Set timeout %s\r\n" % s.timeout)
    s.interCharTimeout = 3
    if args.verbose: sys.stderr.write("Set interCharTimeout %s\r\n" % s.interCharTimeout)


    # read source file line by line and write to device
    if args.verbose: sys.stderr.write("\r\nStage 2. Creating file in flash memory and write first line")
    line = f.readline()
    if args.verbose: sys.stderr.write("\r\nStage 3. Start writing data")
    while line != '':
        writer(line.strip())
        line = f.readline()

    # close both files
    f.close()

    # close serial port
    s.flush()
    s.close()

    # flush screen
    sys.stdout.flush()
    sys.stderr.flush()
    sys.stderr.write("\r\n--->>> All done <<<---\r\n")