#!/usr/bin/python

"""
ratatat - Battery monitor script for ratpoison

Copyright 2009, Michael DeHaan <mdehaan@redhat.com>

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., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301  USA
"""

import time
import os.path
import string

class RatATat():

    def __init__(self):
       # FIXME: config parser or getopt
       self.DEBUG_MODE = 0
       self.BATT_LOW_PERCENTAGE = 35
       self.BATT_CRITICAL_PERCENTAGE = 10
       self.alerts = []
       self.ONCE = True

    def proc2hash(self,fname):
        results = {}
        fh = open(fname)
        data = fh.read()
        fh.close()
        for line in data.split("\n"):
            tokens = line.split(":",1)
            if len(tokens) == 2:
                key = tokens[0].strip()
                value = tokens[1].strip()
                results[key] = value
        return results

    def cleanup(self,stringy):
        return stringy.lower().replace("mwh","").strip()

    def battery_alerts(self,alerts):
        """
        Show critical battery events on OSD, but don't bother the user unless he needs to care.
        """
        batt_state      = self.proc2hash("/proc/acpi/battery/BAT0/state")
        batt_info       = self.proc2hash("/proc/acpi/battery/BAT0/info")
        capacity        = float(self.cleanup(batt_state["remaining capacity"]))
        real_capacity   = float(self.cleanup(batt_info["last full capacity"]))
        charging_state  = self.cleanup(batt_state["charging state"]) # charged, charging?
        percentage      = int(100 * (capacity / real_capacity))
  
        if self.DEBUG_MODE or self.ONCE or charging_state == "discharging":
            if percentage < self.BATT_LOW_PERCENTAGE:
                alerts.append("BATT LOW [%s]" % percentage)
            elif percentage < self.BATT_CRITICAL_PERCENTAGE:
                alerts.append("*** BATT CRITICAL [%s] *** " % percentage)
            elif self.ONCE or self.DEBUG_MODE:
                alerts.append("BATT OK [%s]" % percentage)
            self.ONCE = False


    def run(self):
        self.ONCE = True
        while True:
            alerts = []
            self.battery_alerts(alerts)
            if len(alerts) > 0:
                message = " | ".join(alerts)
                message = message.replace(";","_")
                os.system("ratpoison -c 'echo %s'" % message)
            time.sleep(25)

if __name__ == "__main__":
   notifier = RatATat()
   notifier.run()