-- global
pova = {}


-- set player table and defaults on join
minetest.register_on_joinplayer(function(player)
	pova[ player:get_player_name() ] = {
		default = {speed = 1, jump = 1, gravity = 1}}
end)

-- reset player table and defaults on respawn
minetest.register_on_respawnplayer(function(player)
	pova[ player:get_player_name() ] = {
		default = {speed = 1, jump = 1, gravity = 1}}
end)

-- blank player table on leave
minetest.register_on_leaveplayer(function(player)
	pova[ player:get_player_name() ] = nil
end)


-- main counter that runs every second and totals override list
local timer = 0
minetest.register_globalstep(function(dtime)

	timer = timer + dtime

	-- every 1 second
	if timer < 1 then
		return
	end

	-- reset time for next check
	timer = 0

	-- define locals outside loop
	local name
	local speed, jump, gravity

	-- loop through players
	for _,player in ipairs(minetest.get_connected_players()) do

		name = player:get_player_name()

		if pova[name] then

			-- check for new defaults
			speed = pova[name]["default"].speed or 1
			jump = pova[name]["default"].jump or 1
			gravity = pova[name]["default"].gravity or 1

			for id, var in pairs(pova[name]) do

				if var and id ~= "default" then

					-- add any additional changes
					speed = speed + (pova[name][id].speed or 0)
					jump = jump + (pova[name][id].jump or 0)
					gravity = gravity + (pova[name][id].gravity or 0)
				end

			end

			print ("speed: " .. speed .. " / jump: " .. jump .. " / gravity: " .. gravity)

			player:set_physics_override(speed, jump, gravity)

		end

	end

end)


-- axe tool that adds to override table on use
minetest.register_craftitem("pova:axe", {
	description = "Test Axe (left to apply, right to remove effects)",
	inventory_image = "default_tool_steelaxe.png",
	liquids_pointable = true,

	on_use = function(itemstack, user, pointed_thing)

		local name = user:get_player_name()

		-- set new defaults
		pova[name]["default"].speed = 2
		pova[name]["default"].jump = 0.5
		pova[name]["default"].gravity = 1.0

		-- define and set changes to apply
		pova[name]["test"] = {}
		pova[name]["test"].speed = 1
		pova[name]["test"].jump = 2
		pova[name]["test"].gravity = 0.5
	end,

	on_place = function(itemstack, user, pointed_thing)

		local name = user:get_player_name()

		-- reset defaults
		pova[name]["default"].speed = 1
		pova[name]["default"].jump = 1
		pova[name]["default"].gravity = 1

		-- remove changes
		pova[name]["test"] = nil
	end,
})