#!/usr/bin/env python
#
# Script to receive commands from uir/irman device and issue actions for them
#
# (C) 2005 Nedko Arnaudov <nedko@arnaudov.name>
#
# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

import serial
import time
import sys
import os

# unix device file of serial port where device is attached
serial_device = '/dev/ttyS1'

# how many times code should be received, before issuing command
threshold = 2

# repeat period, in count of times code is received
repeat_period = 3

# codes are for JVC RM-C71
commands = {
    '0067C0':
    {'description': 'mute'},

    '019C':
    {'description': 'power'},

    '01F8':
    {'description': '1'},

    'F8':
    {'description': '2'},

    '0183C0':
    {'description': '3'},

    '78':
    {'description': '4'},

    '01C3C0':
    {'description': '5'},

    '00C3C0':
    {'description': '6'},

    '019E':
    {'description': '7'},

    '38':
    {'description': '8'},

    '01E3C0':
    {'description': '9'},

    '0F':
    {'description': '0'},

    '0FCCF0':
    {'description': 'red',
     'type': 'system',
     'command': 'mpc play'},

    '3C66':
    {'description': 'green',
     'type': 'system',
     'command': 'mpc pause'},

    '3E66':
    {'description': 'yellow',
     'type': 'system',
     'command': 'mpc stop'},

    '3CCCF0':
    {'description': 'blue',
     'type': 'system',
     'command': 'mpc toggle'},

    '0F3C':
    {'description': 'teletext'},

    '01E670':
    {'description': 'P.MODE/OK'},

    '0187C0':
    {'description': 'AV'},

    '00E670':
    {'description': 'MENU'},

    '0199F0':
    {'description': 'left/volume down',
     'type': 'system',
     'command': 'mpc volume -5'},

    '01E7C0':
    {'description': 'up/next program',
     'type': 'system',
     'command': 'mpc next'},

    'CC':
    {'description': 'right/volume up',
     'type': 'system',
     'command': 'mpc volume +5'},

    '30':
    {'description': 'down/previous program',
     'type': 'system',
     'command': 'mpc prev'},
    };

def receive_cmd():
    bytes = []
    bytes.append(ord(serial_port.read()))
    bytes.append(ord(serial_port.read()))
    bytes.append(ord(serial_port.read()))
    bytes.append(ord(serial_port.read()))
    bytes.append(ord(serial_port.read()))
    bytes.append(ord(serial_port.read()))

    # strip traling zero bytes
    for i in [5,4,3,2,0]:
        if bytes[i] != 0:
            break
        del bytes[i]

    cmd = ""
    for byte in bytes:
        cmd += "%02X" % byte

    return cmd

def print_cmd(cmd):
    if not commands.has_key(cmd):
        print "unknown: " + cmd
        return

    if commands[cmd].has_key('description'):
        print "\"%s\"" % commands[cmd]['description']
    else:
        print commands[cmd]

def execute_cmd(cmd, repeat):
    if repeat:
        print "repeat:",
    print_cmd(cmd)

    if cmd == "0738":
        raise "exit"

    if not commands.has_key(cmd):
        return

    if not commands[cmd].has_key('type'):
        return

    if commands[cmd]['type'] == 'system':
        print "Executing \"%s\"" % commands[cmd]['command']
        os.system(commands[cmd]['command'])

try:
    # Create serial port object
    print "Opening \"%s\" ..." % serial_device
    serial_port = serial.Serial(serial_device,9600,8)

    # Start Initialization
    print "Initializing device ..."
    serial_port.setDTR()
    serial_port.setRTS()
    time.sleep(1)
    serial_port.write("I")
    time.sleep(.5)
    serial_port.write("R")
    time.sleep(1)

    # Read device response
    print "Reading device response..."
    x = serial_port.read()
    y = serial_port.read()
    print "%c%c"%(x,y)

    if x != 'O' or y != 'K':
        print "Bad initialization response from device"
        sys.exit(0)

    repeated = 0

    while 1: #loop forever
        cmd = receive_cmd();

        if repeated != 0 and last == cmd:
            repeated += 1
        else:
            repeated = 1
            last = cmd

        if repeated == threshold:
            execute_cmd(cmd, False)
        elif repeated > threshold and ((repeated - threshold) % repeat_period) == 0:
            execute_cmd(cmd, True)
except "exit":
    print "Exiting because IR command"
    sys.exit(0)
except KeyboardInterrupt:
    print "Exiting because of keyboard interrupt"
    sys.exit(1)