--
--  rhctl
--
--  Copyright (C) 2009 Christian Pointner <equinox@spreadspace.org>
--
--  This file is part of rhctl.
--
--  rhctl 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
--  any later version.
--
--  rhctl 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 rhctl. If not, see <http://www.gnu.org/licenses/>.
--

socket = require("socket")

function send_mail(address, subject, bodytext)
   local fp = assert(io.popen("/usr/sbin/mini_sendmail -smailrelay -fnoreply@helsinki.at " .. address, "w"))
   
   fp:write("Subject: " .. subject .. "\n")
   fp:write("To: " .. address .. "\n")
   fp:write("\n")
   fp:write(bodytext)
   fp:write("\n")
   fp:close()
end

current_state = nil

function process_cmd(message)
   log.printf(log.DEBUG, "received message: '%s'", message)
   
   silence_state = string.match(message, "S0S,(%d)")

   if(silence_state and silence_state ~= current_state) then
      if(silence_state == "0") then
         log.printf(log.NOTICE, "seen some noise")
         send_mail("silence@helsinki.at", "[RHCTL] sees some noise", 
                   "There is some noise at output 1 of the audioswitch\nCurrent State is: " .. message) 
      else
         if (silence_state == "1") then
            log.printf(log.NOTICE, "silence detected")
            send_mail("logs@helsinki.at", "[RHCTL] silence detected ", 
                      "Silence detected at output 1 of the audioswitch, make some noise!!\nCurrent State is:  " .. message) 
         end
      end
      current_state = silence_state      
   end
   
   return 0
end

function main_loop(opt) 
   log.printf(log.NOTICE, "main_loop started")
   local sig = signal.init()
   local cmdfd = cmd.init()
   
   cmd.send_string("listen silence");
   cmd.send_string("switch *0SS");
   
   local return_value = 0
   while return_value == 0 do
      local readable, _, err = socket.select({ sig , cmdfd }, nil)
      if(err) then
         log.printf(log.ERROR, "select returned with error: %s", err)
         return_value = -1
      else
         for _, input in ipairs(readable) do
            if(input == sig) then
               return_value = signal.handle()
               if(return_value == 1) then break end
            else 
               if(input == cmdfd) then
                  return_value = cmd.recv_data(process_cmd)
                  if(return_value ~= 0) then break end
               else
                  log.printf(log.ERROR, "select returned invalid handle??")
                  return_value = -1
                  break;
               end
            end
         end
      end
   end
   
   signal.stop()
   return return_value
end