--Displays numbers for damage

local drawables = {}

net.Receive("art_damage_ent",function()
	--print("Notified of damage")
	local who = net.ReadEntity()
	local dmg = net.ReadDouble()

	--A random vector in the entity
	if not IsValid(who) then return end
	local aa,bb = who:WorldSpaceAABB()
	local mr = math.random
	local rx,ry,rz = mr(aa.x,bb.x),mr(aa.y,bb.y),mr(aa.z,bb.z)
	local drawinfo = {
		starttime = CurTime(),
		ammt = dmg,
		startpos = Vector(rx,ry,rz)
	}

	--Max 255 drawables at once
	drawables[(#drawables + 1) % 255] = drawinfo
end)

hook.Add( "PostDrawOpaqueRenderables", "art_damage_draw", function()
	local trace = LocalPlayer():GetEyeTrace()
	local angle = trace.HitNormal:Angle()

	local lpp,sp = LocalPlayer():GetPos(),trace.HitPos
	local to = lpp - sp
	local matang = to:Angle()

	matang.r = 90
	matang.y = matang.y + 90
	matang.p = 0

	render.DrawLine( trace.HitPos, trace.HitPos + 8 * angle:Forward(), Color( 255, 0, 0 ), true )
	render.DrawLine( trace.HitPos, trace.HitPos + 8 * -angle:Right(), Color( 0, 255, 0 ), true )
	render.DrawLine( trace.HitPos, trace.HitPos + 8 * angle:Up(), Color( 0, 0, 255 ), true )

	surface.SetFont( "Trebuchet24" )
	for k,v in pairs(drawables) do
		local ct = CurTime()
		local delta = ct - v.starttime
		local alpha = 255 * (math.log(v.ammt) - (delta / 2))
		if alpha < 1 then
			drawables[k] = nil
			continue
		end
		local lam = math.log(v.ammt)
		local lad = 20 / lam
		local opx = math.sin(delta) * lad
		local opy = math.cos(delta) * lad
		local dpos = v.startpos + Vector(opx,opy,delta * 100 * (1 / v.ammt) + 20)
		local nmatang = (lpp - dpos):Angle()
		nmatang.r = 90
		nmatang.y = nmatang.y + 90
		nmatang.p = 0
		surface.SetTextColor( 255, 255, 255, alpha )
		cam.Start3D2D( dpos, nmatang, lam )
			surface.SetTextPos(0,0)
			surface.DrawText(tostring(v.ammt))
		cam.End3D2D()
	end
end )