local gc=love.graphics
local kb=love.keyboard

local abs=math.abs
local max,min=math.max,math.min
local rnd=math.random

local scene={}

local state
local bx,by=640,360--Ball posotion
local vx,vy=0,0--Ball velocity
local ry=0--Rotation Y

local p1,p2--Player data

function scene.sceneInit()
	BG.set("none")
	BGM.play("way")
	state=0

	bx,by=640,360
	vx,vy=0,0
	ry=0

	p1={
		score=0,
		y=360,
		vy=0,
		y0=false,
	}
	p2={
		score=0,
		y=360,
		vy=0,
		y0=false,
	}
end

local function start()
	state=1
	vx=rnd()>.5 and 6 or -6
	vy=rnd()*6-3
end
function scene.keyDown(key)
	if key=="space"then
		if state==0 then
			start()
		end
	elseif key=="r"then
		state=0
		bx,by=640,360
		vx,vy=0,0
		ry=0
		p1.score,p2.score=0,0
		SFX.play("hold")
	elseif key=="w"or key=="s"then
		p1.y0=false
	elseif key=="up"or key=="down"then
		p2.y0=false
	elseif key=="escape"then
		SCN.back()
	end
end
function scene.touchDown(x,y)
	scene.touchMove(x,y)
	if state==0 then start()end
end
function scene.touchMove(x,y)(x<640 and p1 or p2).y0=y end
function scene.mouseMove(x,y)(x<640 and p1 or p2).y0=y end

--Rect Area X:150~1130 Y:20~700
function scene.update()
	--Update pads
	local P=p1
	while P do
		if P.y0 then
			if P.y>P.y0 then
				P.y=max(P.y-8,P.y0,70)
				P.vy=-8
			elseif P.y<P.y0 then
				P.y=min(P.y+8,P.y0,650)
				P.vy=8
			else
				P.vy=P.vy*.5
			end
		else
			if kb.isDown(P==p1 and"w"or"up")then P.vy=max(P.vy-1,-8)end
			if kb.isDown(P==p1 and"s"or"down")then P.vy=min(P.vy+1,8)end
			P.y=P.y+P.vy
			P.vy=P.vy*.9
			if P.y>650 then
				P.vy=-P.vy*.5
				P.y=650
			elseif P.y<70 then
				P.vy=-P.vy*.5
				P.y=70
			end
		end
		P=P==p1 and p2
	end

	--Update ball
	bx,by=bx+vx,by+vy
	if ry~=0 then
		if ry>0 then
			ry=max(ry-.1,0)
			vy=vy-.1
		else
			ry=min(ry+.1,0)
			vy=vy+.1
		end
	end
	if state==1 then--Playing
		if bx<160 or bx>1120 then
			P=bx<160 and p1 or p2
			local d=by-P.y
			if abs(d)<60 then
				vx=-vx-(vx>0 and .05 or -.5)
				vy=vy+d*.08+P.vy*.5
				ry=P.vy
				SFX.play("collect")
			else
				state=2
			end
		end
		if by<30 or by>690 then
			by=by<30 and 30 or 690
			vy,ry=-vy,-ry
			SFX.play("collect")
		end
	elseif state==2 then--Game over
		if bx<-120 or bx>1400 or by<-40 or by>760 then
			P=bx>640 and p1 or p2
			P.score=P.score+1
			TEXT.show("+1",bx>1400 and 470 or 810,226,50,"score")
			SFX.play("reach")

			state=0
			bx,by=640,360
			vx,vy=0,0
		end
	end
	bx,by,vx,vy,ry=bx,by,vx,vy,ry
end

function scene.draw()
	--Draw score
	setFont(100)
	gc.setColor(.4,.4,.4)
	mStr(p1.score,470,20)
	mStr(p2.score,810,20)

	--Draw boundary
	gc.setColor(1,1,1)
	gc.setLineWidth(6)
	gc.line(130,20,1160,20)
	gc.line(130,700,1160,700)

	--Draw ball & speed line
	gc.setColor(1,1,1-abs(ry)*.16)
	gc.circle("fill",bx,by,10)
	gc.setColor(1,1,1,.1)
	gc.line(bx+vx*22,by+vy*22,bx+vx*30,by+vy*30)

	--Draw pads
	gc.setColor(1,.8,.8)
	gc.rectangle("fill",130,p1.y-50,20,100)
	gc.setColor(.8,.8,1)
	gc.rectangle("fill",1130,p2.y-50,20,100)
end

scene.widgetList={
	WIDGET.newKey{name="reset",x=640,y=45,w=150,h=50,font=35,code=pressKey"r"},
	WIDGET.newKey{name="back",x=640,y=675,w=150,h=50,font=35,code=backScene},
}

return scene