#!/usr/bin/env python
import serial
import gobject
import os
import sys
import subprocess

class serial_checker (gobject.GObject):
    def __init__(self):
        self.config = {"port":0,"carrier_detect_pressed":"echo carrier\ detect\ pressed\n"}
        #read the config file
        cfile = os.path.expanduser("~/.serial_switch" )
        file_lines = open(cfile)
        for line in file_lines:
            #trim the white spaces
            line = line.strip()
            #if the line has length and the first char isn't a hash
            if len(line) and line[0]!="#":
                #this is a parsible line
                (key,value) = line.split(":",1)
                self.config[key.strip()] = value.strip()
                
        self.cd_switch_down = False
        self.cd_switch_action_running = False
        gobject.GObject.__init__(self)
        self.switch_count = 0
        #define our serial
        self.ser = serial.Serial(self.config["port"])
        self.mainloop = gobject.MainLoop()
        gobject.timeout_add(150, self.check_switches )
    
    def cd_switch_action(self):
        #what is the user requested command?
        command = self.config["carrier_detect_pressed"]
        #print command
        #run the command, this should be in a thread or asynchronous
        subprocess.Popen(command,shell=True)
        
    def run(self):
        #run the main loop
            self.mainloop.run()
    
    #check the switches
    def check_switches(self):
        cdval = self.ser.getCD()
        if (cdval):
            if(self.cd_switch_down==False):
                self.cd_switch_down = True
                #try to run the cd switch action
                self.cd_switch_action()
        else:
            self.cd_switch_down = False

        return True
    
    #when the class is closed, clean up
    def __del__(self):
        self.ser.close()
        self.mainloop.quit()
        

if (__name__=="__main__"):
    ser_check = serial_checker()
    ser_check.run()

# this is a config file for serial_switch
# all configurations will be in key:value format

# serial port (default /dev/ttyS0 )
#port:/dev/ttyS0

#what happens when the carrier_detect switch is pressed
carrier_detect_pressed: gmrun