module System where
import qualified Data.Map as M
import Control.Monad.Reader
import System.IO
import Data.List
import API


plugin :: InfinityPlugin
plugin = InfinityPlugin {
  name        =  "System",
  commands    = [("join","joins a channel")
                ,("part","parts a channel")
                ,("list","list commands")
                ,("help","shows help for a command")
                ,("version","show version info")],
  action = system
}

system :: PLUGIN
system user channel command args = do
  case command of
    "join" -> do
      admins <- asks admins
      if user `elem` admins then
          case args of
            Nothing -> retJust $ "Need a channel..."
            Just av -> do
                      mapM_ (send "JOIN") (words av)
                      retJust $ "joined " ++ (concat $ intersperse " " $ words av)
       else retJust "Can't do that..."
    "part" -> do
      admins <- asks admins
      if user `elem` admins then 
          case args of
            Nothing -> send "PART" channel >> retNothing
            Just av -> do
                      mapM_ (\ch -> send "PART" ch) (words av)
                      retJust $ "parted " ++ (concat $ intersperse " " $ words av)
       else retJust "Can't do that..."
    "list" -> do
      plist <- getplugs
      let plist' = map (\p -> ((name p)++" provides: "++(concat . (intersperse " ") .  fst . unzip . commands $ p))) plist
      retJust $ unlines plist'
    "help" -> do
      plist   <- getplugs
      case args of
        Nothing -> retJust $ "Need a command, try '!help help!"
        Just av -> do
            let cmd    = (head . words) av
                plist' = filter (\p -> cmd `elem` (fst . unzip . commands $ p)) plist
            if null plist' then do
                  retJust $ "No plugin with command '"++cmd++"' found..."
             else do
                   let x = head plist'
                   retJust $ M.findWithDefault "No help available..." cmd $ (M.fromList . commands) x
    "version" -> infinityVer >>= retJust