{-|
Module      : Werewolf.Commands.Help
Description : Options and handler for the help subcommand.

Copyright   : (c) Henry J. Wylde, 2015
License     : BSD3
Maintainer  : public@hjwylde.com

Options and handler for the help subcommand.
-}

{-# LANGUAGE OverloadedStrings #-}

module Werewolf.Commands.Help (
    -- * Options
    Options(..), Command(..),

    -- * Handle
    handle,
) where

import Control.Lens
import Control.Monad.IO.Class

import           Data.Text (Text)
import qualified Data.Text as T

import Game.Werewolf.Response
import Game.Werewolf.Role     as Role

-- | Options.
data Options = Options
    { argCommand :: Maybe Command
    } deriving (Eq, Show)

-- | Command.
data Command = Commands | Description | Rules | Roles
    deriving (Eq, Show)

-- | Handle.
handle :: MonadIO m => Text -> Options -> m ()
handle callerName (Options (Just Commands)) = exitWith success
    { messages = map (privateMessage callerName) commandsMessages
    }
handle callerName (Options (Just Description)) = exitWith success
    { messages = map (privateMessage callerName) descriptionMessages
    }
handle callerName (Options (Just Roles)) = exitWith success
    { messages = map (\role -> privateMessage callerName $ T.intercalate "\n"
        [ T.snoc (role ^. Role.name) ':'
        , role ^. description
        , role ^. advice
        ]) allRoles
    }
handle callerName (Options (Just Rules)) = exitWith success
    { messages = map (privateMessage callerName) rulesMessages
    }
handle callerName (Options Nothing) = exitWith success
    { messages = map (privateMessage callerName) helpMessages
    }

commandsMessages :: [Text]
commandsMessages =
    [ "end - ends the current game."
    , "heal PLAYER - heal a devoured player."
    , "pass - pass on healing or poisoning a player."
    , "ping - pings the status of the current game publicly."
    , "poison PLAYER - poison a player."
    , "protect PLAYER - protect a player."
    , "quit - quit the current game."
    , "see PLAYER - see a player's allegiance."
    , "start [--extra-roles ROLE,...] PLAYER... - starts a new game with the given players and extra roles. A game requires at least 7 players."
    , "status - gets the status of the current game."
    , "vote PLAYER - vote against a player."
    ]

descriptionMessages :: [Text]
descriptionMessages = map (T.intercalate "\n")
    [ [ T.unwords
        [ "Deep in the American countryside,"
        , "the little town of Millers Hollow has recently been infiltrated by Werewolves."
        ]
      , T.unwords
        [ "Each night, murders are committed by the Villagers,"
        , "who due to some mysterious phenomenon (possibly the greenhouse effect)"
        , "have become Werewolves."
        ]
      , T.unwords
        [ "It is now time to take control and eliminate this ancient evil,"
        , "before the town loses its last few inhabitants."
        ]
      ]
    , [ "Objective of the Game:"
      , "For the Villagers: lynch all of the Werewolves."
      , "For the Werewolves: devour all of the Villagers."
      ]
    ]

rulesMessages :: [Text]
rulesMessages = map (T.intercalate "\n")
    [ [ T.unwords
        [ "Each night, the Werewolves bite, kill and devour one Villager."
        , "During the day they try to conceal their identity and vile deeds from the Villagers."
        , "The number of Werewolves in play depends upon"
        , " the number of players and variants used in the game."
        ]
      , T.unwords
        [ "Each day,"
        , "the survivors gather in the town square and try to discover who the Werewolves are."
        , "This is done by studying the other player's social behaviours"
        , "for hidden signs of lycanthropy."
        , "After discussing and debating, the village votes to lynch a suspect,"
        , "who is then hanged, burned and eliminated from the game."
        ]
      ]
    , [ T.unwords
        [ "Each player is informed of their role (see `help roles' for a list)"
        , "at the start of the game. A game begins at night and follows a standard cycle."
        ]
      , "1. The village falls asleep."
      , "2. The Defender wakes up and protects someone."
      , "3. The Seer wakes up and sees someone's allegiance."
      , "4. The Werewolves wake up and select a victim."
      , "5. The Witch wakes up and may heal the victim and/or poison someone."
      , "6. The village wakes up and find the victim."
      , "7. The village votes to lynch a suspect."
      , "The game is over when only Villagers or Werewolves are left alive."
      ]
    ]

helpMessages :: [Text]
helpMessages =
    [ "help commands - print the in-game commands."
    , "help description - print the game description."
    , "help roles - print the roles and their description."
    , "help rules - print the game rules."
    ]