{-|
Module      : Werewolf.Command.Pass
Description : Handler for the pass subcommand.

Copyright   : (c) Henry J. Wylde, 2016
License     : BSD3
Maintainer  : public@hjwylde.com

Handler for the pass subcommand.
-}

module Werewolf.Command.Pass (
    -- * Handle
    handle,
) where

import Control.Lens
import Control.Monad.Except
import Control.Monad.Extra
import Control.Monad.Random
import Control.Monad.State
import Control.Monad.Writer

import Data.Text (Text)

import Game.Werewolf
import Game.Werewolf.Command
import Game.Werewolf.Command.Necromancer as Necromancer
import Game.Werewolf.Command.Witch       as Witch
import Game.Werewolf.Engine
import Game.Werewolf.Message.Error

import Werewolf.System

handle :: (MonadIO m, MonadRandom m) => Text -> Text -> m ()
handle callerName tag = do
    unlessM (doesGameExist tag) $ exitWith failure
        { messages = [noGameRunningMessage callerName]
        }

    game <- readGame tag

    command <- case game ^. stage of
            NecromancersTurn    -> return $ Necromancer.passCommand callerName
            WitchsTurn          -> return $ Witch.passCommand callerName
            _                   -> exitWith failure
                { messages = [playerCannotDoThatRightNowMessage callerName]
                }

    result <- runExceptT . runWriterT $ execStateT (apply command >> checkStage >> checkGameOver) game
    case result of
        Left errorMessages      -> exitWith failure { messages = errorMessages }
        Right (game', messages) -> writeOrDeleteGame tag game' >> exitWith success { messages = messages }