-- Based on 4itemnames mod by 4aiman

local wield = {}
local wieldindex = {}
local huds = {}
local dtimes = {}
local dlimit = 3  -- HUD element will be hidden after this many seconds

local function set_hud(player)
	if not player:is_player() then return end
	local player_name = player:get_player_name()
	-- Fixed offset in config file
	local fixed = tonumber(core.settings:get("show_wielded_item_y_offset"))
	local off
	if fixed and fixed ~= -1 then
		-- Manual offset
		off = {x=0, y=-fixed}
	else
		-- Offset to hudbars
		local rows = math.floor((#hb.get_hudbar_identifiers()-1) / 2) + 1
		local vmargin = tonumber(core.settings:get("hudbars_vmargin")) or 24
		off = {x=0, y=-101 - vmargin*rows}

		-- Dirty trick to avoid collision with Minetest's status text (e.g. “Volume changed to 0%”)
		if off.y >= -167 and off.y <= -156 then
			off.y = -181
		end
	end

	huds[player_name] = player:hud_add({
		type = "text",
		position = {x=0.5, y=1},
		offset = off,
		alignment = {x=0, y=0},
		number = 0xFFFFFF ,
		text = "",
		z_index = 100,
	})
end

core.register_on_joinplayer(function(player)
	set_hud(player)

	local name = player:get_player_name()
	wield[name] = player:get_wielded_item():get_name()
	wieldindex[name] = player:get_wield_index()
end)

core.register_on_leaveplayer(function(player)
	local name = player:get_player_name()
	wield[name] = nil
	wieldindex[name] = nil
end)

local function get_first_line(text)
	-- Cut off text after first newline
	local firstnewline = string.find(text, "\n")
	if firstnewline then
		text = string.sub(text, 1, firstnewline-1)
	end
	return text
end

mcl_player.register_globalstep(function(player, dtime)
	local player_name = player:get_player_name()
	local wstack = player:get_wielded_item()
	local wname = wstack:get_name()
	local windex = player:get_wield_index()

	if dtimes[player_name] and dtimes[player_name] < dlimit then
		dtimes[player_name] = dtimes[player_name] + dtime
		if dtimes[player_name] > dlimit and huds[player_name] then
			player:hud_change(huds[player_name], 'text', "")
		end
	end

	-- Update HUD when wielded item or wielded index changed
	if wname ~= wield[player_name] or windex ~= wieldindex[player_name] then
		wieldindex[player_name] = windex
		wield[player_name] = wname
		dtimes[player_name] = 0

		if huds[player_name] then

			-- Get description (various fallback checks for old Minetest versions)
			local def = core.registered_items[wname]
			local desc
			if wstack.get_short_description then
				-- get_short_description()
				desc = wstack:get_short_description()
			end
			if (not desc or desc == "") and wstack.get_description then
				-- get_description()
				desc = wstack:get_description()
				desc = get_first_line(desc)
			end
			if (not desc or desc == "") and not wstack.get_description then
				-- Metadata (old versions only)
				local meta = wstack:get_meta()
				desc = meta:get_string("description")
				desc = get_first_line(desc)
			end
			if not desc or desc == "" then
				-- Item definition
				desc = def.description
				desc = get_first_line(desc)
			end
			if not desc or desc == "" then
				-- Final fallback: itemstring
				desc = wname
			end

			-- Print description
			if desc then
				-- Optionally append the 'technical' itemname
				local tech = core.settings:get_bool("show_wielded_item_itemname", false)
				if tech and desc ~= "" then
					desc = desc .. " ["..wname.."]"
				end
				player:hud_change(huds[player_name], 'text', desc)
			end
		end
	end
end)

