balls = {}
hideTool = 0

function init()
	throw = LoadSound("throw/m0.ogg")
	snd = LoadSound("tools/snowball0.ogg")

	RegisterTool("snowball", "loc@SNOWBALL", "vox/snowball.vox")
end

function rnd(mi, ma)
	return math.random()*(ma-mi)+mi
end

function rndVec(length)
	local v = VecNormalize(Vec(math.random()-0.5, math.random()-0.5, math.random()-0.5))
	return VecScale(v, length)	
end

function impact(shape, point, normal, velocity)
	local r = math.random()
	if r < 0.33 then
		AddSnow(shape, point, 0.22)
	elseif r < 0.66 then
		AddSnow(shape, point, 0.24)
	else
		AddSnow(shape, point, 0.26)
	end
	PlaySound(snd, point)
	ParticleReset()
	ParticleTile(4)
	ParticleCollide(1)
	ParticleSticky(0.1)
	local vel = VecSub(velocity, VecScale(normal, VecDot(normal, velocity)))
	for i=1, 150 do
		local dir = VecNormalize(VecAdd(normal, rndVec(0.7)))
		local p = VecAdd(point, VecScale(VecNormalize(VecSub(dir, VecScale(normal, VecDot(normal, dir)))), 0.2))
		local v = VecAdd(VecScale(vel, rnd(0, 0.5)), VecScale(dir, rnd(0, 2)))
		ParticleRadius(rnd(0.02, 0.06))
		ParticleGravity(rnd(-10, -5))
		SpawnParticle(p, v, rnd(2,3))
	end
	ParticleReset()
	ParticleType("smoke")
	ParticleCollide(0)
	for i=1, 20 do
		local dir = VecNormalize(VecAdd(normal, rndVec(0.9)))
		local p = VecAdd(point, VecScale(VecNormalize(VecSub(dir, VecScale(normal, VecDot(normal, dir)))), 0.2))
		local v = VecScale(dir, rnd(0, 2))
		ParticleAlpha(0.3, 0)
		ParticleRadius(0.15, 0.25)
		ParticleGravity(rnd(-2, -1))
		SpawnParticle(p, v, rnd(2,4))
	end
end

function tick(dt)
	if GetString("game.player.tool") == "snowball" then
		SetInt("game.tool.snowball.ammo", 9999)
		SetToolTransform(Transform(Vec(0.3, -0.3-hideTool*0.5, -0.5+hideTool*0.5)))	
		if GetBool("game.player.canusetool") and InputPressed("usetool") then
			local t = GetCameraTransform()
			local fwd = TransformToParentVec(t, Vec(0,0,-1))
			local pos = TransformToParentPoint(t, Vec(0.3, -0.3, -0.5))
			local vel = VecAdd(VecScale(fwd, 16), Vec(0, 4, 0))
			local entities = Spawn("<body dynamic='true'><vox file='snowball.vox'/></body>", Transform(pos))
			local body = entities[1]
			local shape = entities[2]
			SetShapeCollisionFilter(shape, 0, 0)
			SetBodyVelocity(body, vel)
			SetBodyAngularVelocity(body, Vec(rnd(-5, 5), rnd(-5, 5), rnd(-5, 5)))
			balls[#balls+1] = body
			PlaySound(throw)
			hideTool = 1
			SetValue("hideTool", 0, "easeout", 0.3)
		end
	end
end


function update(dt)
	if #balls > 0 then
		local newBalls = {}
		for i=1, #balls do
			local body = balls[i]
			local pos = GetBodyTransform(body).pos
			if pos[2] < -5 then
				Delete(body)
			else
				QueryRejectBody(body)
				local hit, point, normal, shape = QueryClosestPoint(pos, 0.3)
				if hit then
					point = VecAdd(point, VecScale(normal, 0.05))
					impact(shape, point, normal, GetBodyVelocity(body))
					Delete(body)
				else
					newBalls[#newBalls+1] = body
				end
			end
		end
		balls = newBalls	
	end
end