{- |

mtlstats
Copyright (C) 2019 Rhéal Lamothe
<rheal.lamothe@gmail.com>

This program 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 (at
your option) any later version.

This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.

-}

module Mtlstats.Prompt (
  -- * Prompt Functions
  drawPrompt,
  promptHandler,
  strPrompt,
  numPrompt,
  -- * Individual prompts
  gameYearPrompt,
  gameDayPrompt,
  otherTeamPrompt,
  homeScorePrompt,
  awayScorePrompt,
  playerNumPrompt,
  playerNamePrompt,
  playerPosPrompt
) where

import Control.Monad (when)
import Control.Monad.Trans.State (gets, modify)
import Data.Char (isDigit, toUpper)
import Data.Foldable (forM_)
import Lens.Micro ((^.), (.~), (?~))
import Lens.Micro.Extras (view)
import Text.Read (readMaybe)
import qualified UI.NCurses as C

import Mtlstats.Actions
import Mtlstats.Types

-- | Draws the prompt to the screen
drawPrompt :: Prompt -> ProgState -> C.Update C.CursorMode
drawPrompt p s = do
  promptDrawer p s
  return C.CursorVisible

-- | Event handler for a prompt
promptHandler :: Prompt -> C.Event -> Action ()
promptHandler p (C.EventCharacter '\n') = do
  val <- gets $ view inputBuffer
  modify $ inputBuffer .~ ""
  promptAction p val
promptHandler p (C.EventCharacter c) = let
  c' = toUpper c
  in when (promptCharCheck p c') $
   modify $ addChar c'
promptHandler _ (C.EventSpecialKey C.KeyBackspace) =
  modify removeChar
promptHandler p (C.EventSpecialKey k) =
  promptSpecialKey p k
promptHandler _ _ = return ()

-- | Builds a string prompt
strPrompt
  :: String
  -- ^ The prompt string
  -> (String -> Action ())
  -- ^ The callback function for the result
  -> Prompt
strPrompt pStr act = Prompt
  { promptDrawer     = drawSimplePrompt pStr
  , promptCharCheck  = const True
  , promptAction     = act
  , promptSpecialKey = const $ return ()
  }

-- | Builds a numeric prompt
numPrompt
  :: String
  -- ^ The prompt string
  -> (Int -> Action ())
  -- ^ The callback function for the result
  -> Prompt
numPrompt pStr act = Prompt
  { promptDrawer     = drawSimplePrompt pStr
  , promptCharCheck  = isDigit
  , promptAction     = \inStr -> forM_ (readMaybe inStr) act
  , promptSpecialKey = const $ return ()
  }

-- | Prompts for the game year
gameYearPrompt :: Prompt
gameYearPrompt = numPrompt "Game year: " $
  modify . (progMode.gameStateL.gameYear ?~)

-- | Prompts for the day of the month the game took place
gameDayPrompt :: Prompt
gameDayPrompt = numPrompt "Day of month: " $
  modify . (progMode.gameStateL.gameDay ?~)

-- | Prompts for the other team name
otherTeamPrompt :: Prompt
otherTeamPrompt = strPrompt "Other team: " $
  modify . (progMode.gameStateL.otherTeam .~)

-- | Prompts for the home score
homeScorePrompt :: Prompt
homeScorePrompt = numPrompt "Home score: " $
  modify . (progMode.gameStateL.homeScore ?~)

-- | Prompts for the away score
awayScorePrompt :: Prompt
awayScorePrompt = numPrompt "Away score: " $
  modify . (progMode.gameStateL.awayScore ?~)

-- | Prompts for a new player's number
playerNumPrompt :: Prompt
playerNumPrompt = numPrompt "Player number: " $
  modify . (progMode.createPlayerStateL.cpsNumber ?~)

-- | Prompts for a new player's name
playerNamePrompt :: Prompt
playerNamePrompt = strPrompt "Player name: " $
  modify . (progMode.createPlayerStateL.cpsName .~)

-- | Prompts for a new player's position
playerPosPrompt :: Prompt
playerPosPrompt = strPrompt "Player position: " $
  modify . (progMode.createPlayerStateL.cpsPosition .~)

drawSimplePrompt :: String -> ProgState -> C.Update ()
drawSimplePrompt pStr s = C.drawString $ pStr ++ s^.inputBuffer