#!/usr/bin/env 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_ehr as upmehr

def main():
    # Instantiate a  Ear-clip Heart Rate sensor on digital pin D2
    myHeartRateSensor = upmehr.EHR(2)

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

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

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

    # set the beat counter to 0, init the clock and start counting beats
    myHeartRateSensor.clearBeatCounter()
    myHeartRateSensor.initClock()
    myHeartRateSensor.startBeatCounter()

    while(1):
        # we grab these (millis and flowCount) just for display
        # purposes in this example
        millis = myHeartRateSensor.getMillis()
        beats = myHeartRateSensor.beatCounter()

        # heartRate() requires that at least 5 seconds pass before
        # returning anything other than 0
        fr = myHeartRateSensor.heartRate()

        # output milliseconds passed, beat count, and computed heart rate
        outputStr = "Millis: {0} Beats: {1} Heart Rate: {2}".format(
        millis, beats, fr)
        print(outputStr)
        time.sleep(1)

if __name__ == '__main__':
    main()
