#!/usr/bin/python
# Author: Zion Orent <zorent@ics.com>
# Copyright (c) 2015 Intel Corporation.
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

from __future__ import print_function
import time, sys, signal, atexit
from upm import pyupm_hm11 as upmHm11

def main():
    # Instantiate a HM11 BLE Module on UART 0
    my_ble_obj = upmHm11.HM11(0)

    ## Exit handlers ##
    # This stops python from printing a stacktrace when you hit control-C
    def SIGINTHandler(signum, frame):
        raise SystemExit

    # This function lets you run code on exit,
    # including functions from my_ble_obj
    def exitHandler():
        print("Exiting")
        sys.exit(0)

    # Register exit handlers
    atexit.register(exitHandler)
    signal.signal(signal.SIGINT, SIGINTHandler)

    bufferLength = 256

    # make sure port is initialized properly. 9600 baud is the default.
    if (not my_ble_obj.setupTty(upmHm11.cvar.int_B9600)):
        print("Failed to setup tty port parameters")
        sys.exit(0)

    usageStr = ("Usage:\n"
    "Pass a commandline argument (any argument) to this program\n"
    "to query the radio configuration and output it.  NOTE: the\n"
    "radio must be in CONFIG mode for this to work.\n\n"
    "Running this program without arguments will simply transmit\n"
    "'Hello World!' every second, and output any data received from\n"
    "another radio.\n\n")
    print(usageStr)

    # simple helper function to send a command and wait for a response
    def sendCommand(bleObj, cmd):
        bleBuffer = upmHm11.charArray(bufferLength)
        bleObj.writeData(cmd, len(cmd))

        # wait up to 1 second
        if (bleObj.dataAvailable(1000)):
            bleObj.readData(bleBuffer, bufferLength)
            bleData = ""
            # read only the number of characters
            # specified by myGPSSensor.readData
            for x in range(0, bufferLength):
                if (bleBuffer.__getitem__(x) == '\0'):
                    break
                else:
                    bleData += bleBuffer.__getitem__(x)
            print(bleData)
        else:
            print("Timed out waiting for response")

    if (len(sys.argv) > 1):
        print("Sending command line argument (" + sys.argv[1] + ")...")
        sendCommand(my_ble_obj, sys.argv[1])
    else:
        # query the module address
        addr = "AT+ADDR?";
        print("Querying module address (" + addr + ")...")

        sendCommand(my_ble_obj, addr)
        time.sleep(1)
        # query the module address
        pin = "AT+PASS?";
        print("Querying module PIN (" + pin + ")...")
        sendCommand(my_ble_obj, pin)

        # Other potentially useful commands are:
        #
        # AT+VERS? - query module version
        # AT+ROLE0 - set as slave
        # AT+ROLE1 - set as master
        # AT+CLEAR - clear all previous settings
        # AT+RESET - restart the device
        #
        # A comprehensive list is available from the datasheet at:
        # http://www.seeedstudio.com/wiki/images/c/cd/Bluetooth4_en.pdf

if __name__ == '__main__':
    main()
