{-|
Module      : Projectile.Nuke
Description : Tactical nuclear projectile
Copyright   : (c) Christopher Howard, 2016
License     : GPL-3
Maintainer  : ch.howard@zoho.com
-}

module Projectile.Nuke ( Nuke(..)
                       , new
                       ) where

import Prelude ((+), (>=), (<), Maybe(..), Bool(..), (*), (.), ($), cos, sin)
import Graphics.Gloss.Data.Picture ( Picture(Blank, Circle, Color, Scale) )
import Graphics.Gloss.Data.Color ( white, green )
import Data.WrapAround ( WP, WM )
import Data.Maybe ( fromMaybe )

import Combat
import Animation
import Updating
import qualified Moving as M ( Moving(..), Locatable(..), Colliding(..), newLocation )
import ResourceTracker
import Common
import Math

velocityC = 200.0
punch = 8.0
residualPunch = 0.1
detTime = 1.5

data Nuke = Nuke { velocity :: Velocity
                 , center :: WP
                 , wmap :: WM
                 , clock :: Time
                 , initialBlastCompleted :: Bool
                 , rt :: RT
                 }

new :: WM -> ResourceTracker -> Angle -> WP -> Velocity -> Nuke
new a b c d (e, f) =
  Nuke { velocity = (x + e, y + f)
       , center = d
       , wmap = a
       , clock = 0.0
       , initialBlastCompleted = False
       , rt = b
       }
  where (x, y) = appPair ((* velocityC) . ($ c)) (cos, sin)

instance Animation Nuke where
  image s t = if c < detTime
                then Color green (Circle 2.0)
                else if c < detTime + 0.05
                       then f "nuke-0.bmp"
                       else if c < detTime + 0.1
                         then f "nuke-1.bmp"
                         else if c < detTime + 0.15
                                then f "nuke-2.bmp"
                                else if c < detTime + 0.2
                                  then f "nuke-3.bmp"
                                  else Blank
    where f = \x -> Scale 2 2
                (fromMaybe (Color white (Circle 125)) (getImage (rt s) x))
          c = clock s


instance M.Colliding Nuke where

  collisionRadius s = if clock s < detTime then 2 else 200

instance M.Moving Nuke where

  velocity b = velocity b

instance M.Locatable Nuke where

  center b = center b

expFormula a = clock a >= detTime + 0.5 

instance SimpleTransient Nuke where

  expired = expFormula

instance InternallyUpdating Nuke where

  preUpdate s t = s { clock = clock s + t
                    , velocity = if clock s >= detTime then (0, 0) else velocity s
                    }

  postUpdate s t = s { center = M.newLocation (wmap s) (center s) (velocity s) t
                     , initialBlastCompleted = clock s >= detTime
                     }

instance Damaging Nuke where

  damageEnergy s =
    if clock s < detTime
      then 0
      else if initialBlastCompleted s then residualPunch else punch

instance Transient Nuke where

  expired' s = if expFormula s then Just [] else Nothing

instance Damageable Nuke where

  inflictDamage s _ = s