local gun_shot = {}

function gun_shot_init(e)
	CollisionOff(e)
	Scale(e, 80)
	Hide(e)
end

function FireGunShot(x,y,z,xi,yi,zi,soundVolume)
	for k,v in pairs (gun_shot) do
		if not v.used then
			gun_shot[k] = {x  = x,  y  = y,  z  = z, 
						   xi = xi, yi = yi, zi = zi, 
						   used = true, expiry_time = g_Time + 5000}
			Show(k)
			PlaySoundIfSilent(k, 0)
			SetSoundVolume(soundVolume)
			return
		end
	end
end

local function CloserThan(x, z, dist)
	local dX, dZ = x - g_PlayerPosX, z - g_PlayerPosZ
	
	return (dX*dX + dZ*dZ) < dist*dist
end
	
function gun_shot_main(e)

	local vars = gun_shot[e]
	
	if vars == nil then
	
		local Ent = g_Entity[e]
	
		if Ent ~= nil then
			
			gun_shot[e] = 
			   {x = 0, y = 0, z = 0, xi = 0, yi = 0, zi = 0, 
			    used = false, expiry_time = math.huge};
		end
		return
		
	elseif vars.used then
	
		vars.x = vars.x + vars.xi 
		vars.y = vars.y + vars.yi 
		vars.z = vars.z + vars.zi 
		
		local terrH = GetTerrainHeight(vars.x, vars.z)
		if vars.y < terrH or g_Time > vars.expiry_time then
			-- shot has hit the ground or expired
		
			Hide(e)
			gun_shot[e].used = false
			gun_shot[e].expiry_time = math.huge
			return
		end
		
		if CloserThan (vars.x, vars.z, 40) then 
			HurtPlayer(e, 1) 
			Hide(e)
			gun_shot[e].used = false
			gun_shot[e].expiry_time = math.huge
		end
		
		ResetPosition(e, vars.x, vars.y, vars.z)
		RotateToCamera(e)

	end
end