"""
    An inbound application that answers the call, prompts the caller to 
    record a message (and to press any key to stop recording), plays a beep 
    to indicate that it is recording and then records for a maximum of 60 
    seconds. 

    The recorded filename is 
    samples/voicemail1/recordedMessageFrom<callFrom>.wav The application 
    will check that the recorded message file exists before exiting. 

    Actions:
        - check the channel state
        - ring and answer
        - use TTS to play a prompt
        - record a file
        - check that the file exists
        - hang up

    This application is part of the Voice Mail tutorial at https://cloud.aculab.com/documents/voicemail.
"""

from prosody.uas import Hangup, Error

__uas_version__  = "0.0.1"
__uas_identify__ = "application"

def main (channel, application_instance_id, file_man, my_log, application_parameters):
    return_code = 0
    try:
        # check the incoming channel state
        state = channel.state()
        if state == channel.State.CALL_INCOMING:
            state = channel.ring()   # this can raise a Hangup exception
            if state == channel.State.RING_INCOMING:
                state = channel.answer() # this can raise a Hangup exception
        else:
            raise Hangup('No inbound call, state is {0}'.format(state))
        if state != channel.State.ANSWERED:
            raise Hangup('Failed to answer inbound call, state is {0}'.format(state))
        
        my_log.info("Answered an inbound call")
        
        cause = channel.FilePlayer.say ("Please record a message after the tone. Press any digit to stop the recording.")
        if cause != channel.FilePlayer.Cause.NORMAL:
            raise Error("Say please record failed: cause is {0}".format(cause))
    
        msg_file_name = "samples/voicemail1/recordedMessageFrom{0}.wav".format(channel.Details.call_from)

        cause = channel.DTMFPlayer.play ('#')
        if cause != channel.DTMFPlayer.Cause.NORMAL:
            raise Error ("Play # failed: cause is {0}".format (digits, cause))

        cause = channel.FileRecorder.record(msg_file_name, milliseconds_max_silence=3000,
                                            seconds_timeout=60, barge_in=True)
        if cause != channel.FileRecorder.Cause.SILENCE and cause != channel.FileRecorder.Cause.BARGEIN:
            raise Error("Record message failed: cause is {0}".format(cause))

        if file_man.exists("samples/voicemail1/recordedMessageFrom{0}.wav".format(channel.Details.call_from)):
            cause = channel.FilePlayer.say ("Your message has been saved. Good bye.")
            if cause != channel.FilePlayer.Cause.NORMAL:
                raise Error("Say saved failed: cause is {0}".format(cause))
        else:
            cause = channel.FilePlayer.say ("Your message could not be saved. Good bye.")
            if cause != channel.FilePlayer.Cause.NORMAL:
                raise Error("Say saved failed: cause is {0}".format(cause))

    except Hangup as exc:
        my_log.info ("Hangup exception: {0}.".format(exc))
        return_code = 100

    except Error as exc:
        my_log.error("Error execption caught: {0}".format(exc))
        return_code = -101

    except Exception as exc:
        my_log.exception("Unexpected exception caught: {0}".format(exc))
        return_code = -102

    finally:
        if channel.state() != channel.State.IDLE:
            channel.hang_up()
    my_log.info("Example completed")
    return return_code