#!/usr/bin/env python
"""
Copyright 2007 Martin T. Dengler <martin@martindengler.com>

Controls LG-37Z55 TV via serial (via pyserial).

USAGE EXAMPLES

Command line:
python ./tv_control.py on
python ./tv_control.py ison && python ./tv_control.py off
python ./tv_control.py onoff
python ./tv_control.py on input pc volume 30

python usage example:

>>> import tv_control
>>> tv = tv_control.tv(port=0)  # also try port="/dev/ttyUSB1" for USB->serial
>>> tv.on()
>>> print tv.ison()
True
>>> tv.onoff()
>>> print tv.ison()
False

Requires pyserial.


SUPPORTED MODELS

    Will probably work for other LG models, but is completely untested.

    Access via USB-to-serial gateways should work fine.


LICENSE

    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 3 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.

SOURCE

    The source code is available at
    http://www.martindengler.com/proj/tv_control.py


"""

import os
import sys
import time

serial = "/dev/ttyUSB1"
set = 0


SOURCE_TV        = 10
SOURCE_AV1       = 20
SOURCE_AV2       = 21
SOURCE_AV3       = 22
SOURCE_SVIDEO    = 30
SOURCE_COMPONENT = 40
SOURCE_RGB_PC    = 50
SOURCE_HDMI_PC   = 90



def on():
    power(on=True)

def off():
    power(on=False)

def power(on=True):
    command("ka %s %s" % (set, on and 1 or 0))

def input_tv():
    input(source=SOURCE_TV)

def input_dvd():
    input(source=SOURCE_AV1)

def input_wii():
    input(source=SOURCE_SVIDEO)

def input_pc():
    input(source=SOURCE_HDMI_PC)

def input(source=SOURCE_HDMI_PC):
    command("xb %s %s" % (set, source))

def mute(nosound=True):
    cmd = "ke %s %s" % (set, nosound and "0" or "1")
    command(cmd)
    command(cmd) #mute command seems sometimes to be ignored

def volume(level=10):
    """valid levels are between 0 and 100 (decimal)"""
    command("kf %s %0x" % (set, level))

def command(s):
    cmd = '/bin/echo -e "%s\\n" > %s' % (s, serial)
    print "executing: %s" % (cmd.strip())
    os.system(cmd)

def pause():
    print "pausing"
    time.sleep(5)

def main(cmds):
    for cmd in cmds:
        if cmd in globals():
            eval("%s()" % cmd)
    return 0

if __name__ == "__main__":
    sys.exit(main(sys.argv[1:]))