require("mobdebug").start()
require "box2d"

--swivil
application:setOrientation(Application.LANDSCAPE_LEFT)


	world = b2.World.new(0,10,true)

-- function to create bounding walls as a shape
function wall(x,y,width,height,name)
	local wall = Shape.new()
	
	wall:beginPath()
-- we use (0,0) as center of shape and therefor use half of width and height
	wall:moveTo(-width/2,-height/2)
	wall:lineTo(width/2,-height/2)
	wall:lineTo(width/2,height/2)
	wall:lineTo(-width/2,height/2)
	wall:closePath()
	wall:endPath()
	wall:setPosition(x,y)
	
-- create box2d physical object
	local body = world:createBody{type=b2.STATIC_BODY}
	body:setPosition(wall:getX(),wall:getY())
	body:setAngle(wall:getRotation() * math.pi/180)
	
	local poly = b2.PolygonShape.new()
	poly:setAsBox(wall:getWidth()/2,wall:getHeight()/2)
	
	local fixture = body:createFixture{shape = poly, density = 1.0,friction = 0.1,
	restitution = 0.2}
	
	wall.body = body
	wall.body.type = "wall"
  wall.body.name = name
	
-- add to scene
	stage:addChild(wall)

-- return created object
	return wall
end

--Create floor as collision object
function impact(x,y,width,height)
  local impact = Shape.new
  
end
-- create our grenade object using an image and make it abide by law of physics
function grenade(x,y)
	local grenade = Bitmap.new(Texture.new("ball.png"))
	
-- reference the center of img for positioning
	grenade:setAnchorPoint(0.5,0.5)
	grenade:setPosition(x,y)
	
-- get radius
	local radius = grenade:getWidth()/2
	
-- create box2d physical object
	local body = world:createBody{type = b2.DYNAMIC_BODY}
	body:setPosition(grenade:getX(),grenade:getY())
	body:setAngle(grenade:getRotation() * math.pi/180)
	local circle = b2.CircleShape.new(0, 0, radius)
	local fixture = body:createFixture{shape = circle, density = 1.0, friction = 0.1,
	restitution = 0.2}
	grenade.body = body
	grenade.body.type = "grenade"
	
-- add to scene
	stage:addChild(grenade)
	
-- return created object
	return grenade
end

--function explosion(x,y)
	--get images
	local explode1 = Bitmap.new(Texture.new("explode1.png"))
	local explode2 = Bitmap.new(Texture.new("explode2.png"))
	local explode3 = Bitmap.new(Texture.new("explode3.png"))
	local explode4 = Bitmap.new(Texture.new("explode4.png"))
	local explode5 = Bitmap.new(Texture.new("explode5.png"))
	local explode6 = Bitmap.new(Texture.new("explode6.png"))
	local explode7 = Bitmap.new(Texture.new("explode7.png"))
	local explode8 = Bitmap.new(Texture.new("explode8.png"))
	local explode9 = Bitmap.new(Texture.new("explode9.png"))
	local explode10 = Bitmap.new(Texture.new("explode10.png"))
	local explode11 = Bitmap.new(Texture.new("explode11.png"))
	local explode12 = Bitmap.new(Texture.new("explode12.png"))
	local explode13 = Bitmap.new(Texture.new("explode13.png"))
	local explode14 = Bitmap.new(Texture.new("explode14.png"))
	
	--set anchor points
	explode1:setAnchorPoint(0.5,0.5)
	explode2:setAnchorPoint(0.5,0.5)
	explode3:setAnchorPoint(0.5,0.5)
	explode4:setAnchorPoint(0.5,0.5)
	explode5:setAnchorPoint(0.5,0.5)
	explode6:setAnchorPoint(0.5,0.5)
	explode7:setAnchorPoint(0.5,0.5)
	explode8:setAnchorPoint(0.5,0.5)
	explode9:setAnchorPoint(0.5,0.5)
	explode10:setAnchorPoint(0.5,0.5)
	explode11:setAnchorPoint(0.5,0.5)
	explode12:setAnchorPoint(0.5,0.5)
	explode13:setAnchorPoint(0.5,0.5)
	explode14:setAnchorPoint(0.5,0.5)
	
	--create movieclip
	local explode = MovieClip.new{
		{1,10,explode1},{11,20,explode2},{21,30,explode3},{31,40,explode4},
		{41,50,explode5},{51,60,explode6},{61,70,explode7},{71,80,explode8},
		{81,90,explode9},{91,100,explode10},{101,110,explode11},{111,120,explode12},
		{121,130,explode13},{131,140,explode14}
	}
	
	--set position
	--explode:setPosition(x,y)
	
	--explode:gotoAndStop(1)
	
	--goto first image and play
	--explode:gotoAndPlay(1)
		
	--create box2d physical object
	local body = world:createBody{type = b2.STATIC_BODY}
	body:setPosition(explode:getX(), explode:getY())
	body:setAngle(explode:getRotation() * math.pi/180)
	local poly = b2.PolygonShape.new()
	poly:setAsBox(explode:getWidth()/2,explode:getHeight()/2)
	local fixture = body:createFixture{shape = poly, density = 1.0,
	friction = 0.1, restitution = 0.2}
	explode.body = body
	explode.body.type = "explode"
	
	--add to scene
	stage:addChild(explode)
	
	--return created object
--	return explode	
--end

-- Define begin collision event handler function
function onBeginContact(event)
	--getting contact bodies
	local fixtureA = event.fixtureA
	local fixtureB = event.fixtureB
	local bodyA = fixtureA:getBody()
	local bodyB = fixtureB:getBody()
	
	-- check if colliding body is the wall
	--if bodyA.type and bodyA.type == "grenade" then
  if event.contact and bodyB.type == "grenade" then
		--run the explosion 
    --local x,y = bodyA:getX(), bodyA:getY()
		--world:explosion(x,y)
	explode:setPosition(stage.grenade:getX(),stage.grenade:getY())
	--explode:setPosition(100,100)
  explode.movieclip:gotoAndStop(1)
	end
end

world:addEventListener(Event.BEGIN_CONTACT, onBeginContact)
-- Create a mouse joint on mouse down
--create empty box2d body for joint since mouse cursur is not a body ...
--...we need dumm body to create joint
	local ground = world:createBody({})
--joint with dummy body
local mousejoint = nil
function onMouseDown(event)
	if stage.grenade:hitTestPoint(event.x,event.y) then
		local jointDef = b2.createMouseJointDef(ground, stage.grenade.body,
		event.x,event.y,100000)
		mouseJoint = world:createJoint(jointDef)
	end
end

-- Update the target of mouse joint on mouse move
function onMouseMove(event)
	if mouseJoint ~= nil then
		mouseJoint:setTarget(event.x,event.y)
	end
end

-- Destroy the mouse joint on mouse update
function onMouseUp(event)
	if mouseJoint ~= nil then
		world:destroyJoint(mouseJoint)
		mouseJoint = nil
	end
end

-- Mouse event listeners
stage:addEventListener(Event.MOUSE_DOWN, onMouseDown, world.grenade)
stage:addEventListener(Event.MOUSE_MOVE, onMouseMove)
stage:addEventListener(Event.MOUSE_UP, onMouseUp)

-- Create function to run box2d world and move all sprites according to their 
-- box2d body objects
function onEnterFrame()
	world:step(1/60, 8, 3)
	for i = 1, stage:getNumChildren() do
		--get specific sprites
		local sprite = stage:getChildAt(i)
		--check if sprite has a body
		if sprite.body then
			--update position to match box2d world object's position
			local body = sprite.body
			local bodyX, bodyY = body:getPosition()
			sprite:setPosition(bodyX,bodyY)
			sprite:setRotation(body:getAngle() * 180 / math.pi)
		end
	end
end

--create world instance with bounding walls and grenade
--function init()

	local screenW = application:getContentWidth()
	local screenH = application:getContentHeight()

--create bounding walls outside the scene
    wall(0,screenH/2,10,screenH,"wall")
    wall(screenW/2,0,screenW,10,"wall")
    wall(screenW,screenH/2,10,screenH,"wall")
    wall(screenW/2,screenH,screenW,10,"wall")

--create grenade
	stage.grenade = grenade(60,60)
	
--run world
	stage:addEventListener(Event.ENTER_FRAME, onEnterFrame)
	--stage:addEventListener("exitBegin", onExitBegin)
--end