--
--  rhnop
--
--  Copyright (C) 2011 Christian Pointner <equinox@helsinki.at>
--
--  This file is part of rhnop.
--
--  rhnop 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.
--
--  rhnop 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 rhnop. If not, see <http://www.gnu.org/licenses/>.
--

local last_cart = nil

mq = require "mq"
playlog = require "playlog"
rddb = require "rddb"
conf = require "conf"

function handle_now(timestamp, nowcart, nowlen)
   local results, err = rddb:getCartInfo(nowcart);
   if results == nil then
      io.stderr:write("can't fetch cart info: " .. err .. "\n")
   else
--      print(timestamp .. " Info: '" .. results.TITLE .. "' von '" .. results.ARTIST .. "' aus '" .. results.ALBUM .. "'")
      local ret, err = playlog:insertNowMusic(timestamp, nowcart, nowlen, results.TITLE, results.ARTIST, results.ALBUM)
      if ret == nil then
         io.stderr:write("can't insert music info: " .. err .. "\n")
      else
         pipe.signal(timestamp)
      end
   end
end

function handle_message(msg)
   local timestamp, nowcart, nowlen, nextcart, nextlen = string.match(msg, "^(%d+) (%d+) (%d+) (%d+) (%d+)$");
   if not timestamp or not nowcart or not nowlen or not nextcart or not nextlen then
      io.stderr:write("ignoring malformed message\n")
   else
      -- TODO better sanity checks: is now info new or just next?
      if last_cart ~= nowcart then
         last_cart = nowcart
         handle_now(timestamp, nowcart, nowlen)
      end
      -- TODO handle next info
   end
end

function main_loop()
   local q, err = mq.create(conf.queue_name, "ro")
   if q == nil then
      io.stderr:write("creation of message queue failed: " .. err .. "\n")
      os.exit(1)
   end
   
   local ret, err = playlog:init()
   if ret == nil then
      io.stderr:write("creation of playlog failed: " .. err .. "\n")
      os.exit(1)
   end
   last_cart = assert(playlog:getLastCart())
  
   local ret, err = rddb:init()
   if ret == nil then
      io.stderr:write("opening rivendell db failed: " .. err .. "\n")
      playlog:close()
      os.exit(1)
   end

   while true do
      local msg, prio = mq.receive(q)
      if msg == nil then
         io.stderr:write("recv error: " .. prio .. "\n")
         rddb:close()
         playlog:close()
         os.exit(2)
      end
      handle_message(msg)
   end
end