module Server.Util where

import Control.Exception

import qualified Data.Matrix as M

import Linear

import System.Directory

import System.IO.Error

import System.Random

import Library.Types

-- | Remove a file if it exists
removeIfExists
  :: FilePath -- File to remove
  -> IO ()
removeIfExists fileName = removeFile fileName `catch` handleExists
  where handleExists e
          | isDoesNotExistError e = return ()
          | otherwise = throwIO e

newWizard
  :: Position
  -> Float
  -> Wizard
newWizard pos rot =
  Wizard
    { wizardWands   = []
    , wizardRot     = rot
    , wizardPos     = pos
    , wizardMana    = 100
    , wizardHealth  = 100
    , wizardEffects = []
    }

rollInitPosition
  :: ServerMap
  -> IO Position
rollInitPosition arena = do
  r <- randomRIO (1, M.nrows arena)
  c <- randomRIO (1, M.ncols arena)
  if arena M.! (r, c) == Air
  then
    pure $ (fromIntegral <$> V2 r c) + V2 0.5 0.5
  else
    rollInitPosition arena