-- Code for the player's ship.
import "CoreLibs/object"
import "CoreLibs/graphics"
import "CoreLibs/sprites"
import "CoreLibs/timer"
import "bullet"

local gfx <const> = playdate.graphics

-- the amount of charge needed to increase the shot size by 1
local SHOT_INCREMENT <const> = 10
-- maximum value the reserve charge can reach
local MAX_CHARGE <const> = 100

class("Kani").extends(gfx.sprite)

function Kani:init()
   local img = gfx.image.new("images/kani.png")
   Kani.super.init(self, img)
   print(self)
   self:setCollideRect(0, 0, self:getSize())
   self.vector = {x=0,y=0} -- movement direction
   self:setGroupMask(0x2)
   self:setCollidesWithGroupsMask(0x19)

   self.reserveCharge = 100
   self.shotCharge = 0
   self.firingMode = false

   -- input handlers
   self.inputHandlers = {
      upButtonDown =    function() self.vector.y = -1 end,
      downButtonDown =  function() self.vector.y = 1 end,
      leftButtonDown =  function() self.vector.x = -1 end,
      rightButtonDown = function() self.vector.x = 1 end,
      upButtonUp =      function() self.vector.y = 0 end,
      downButtonUp =    function() self.vector.y = 0 end,
      leftButtonUp =    function() self.vector.x = 0 end,
      rightButtonUp =   function() self.vector.x = 0 end,
      cranked = function(change, accelChange) self:chargeReserve(change) end,
      AButtonDown = function()
         self.firingTimer = playdate.timer.keyRepeatTimerWithDelay(0, 500, self.chargeShot, self)
      end,
      AButtonUp = function() self:fire() end,
   }
end

function Kani:chargeReserve(change)
   self.reserveCharge = math.min(self.reserveCharge + change / 15, 100)
   print("Reserve charge at " .. self.reserveCharge)
end

function Kani:chargeShot()
   if self.reserveCharge > SHOT_INCREMENT then
      self.shotCharge += 1
      self.reserveCharge -= SHOT_INCREMENT
      print("Shot charged to size " .. self.shotCharge)
   end
end

function Kani:fire()
   self.firingTimer:remove()

   if self.shotCharge <= 0 then
      return
   end

   print("Creating bullet of size " .. self.shotCharge)
   local bullet = Bullet(self.shotCharge * 2)
   bullet:moveTo(self.x+16, self.y)
   bullet:add()
   self.shotCharge = 0
end

function Kani:addInputHandlers()
   playdate.inputHandlers.push(self.inputHandlers)
end

function Kani:removeInputHandlers()
   playdate.inputHandlers.pop()
end

-- move that crab!
function Kani:update()
   local collisions = select(3, self:moveWithCollisions(self.x + self.vector.x, self.y + self.vector.y))
   for i=0, #collisions, 1 do
      -- handle collisions
   end
end