local S = minetest.get_translator("tutorial_areas")

-- Legacy support: Name of the HUD type field for 'hud_add'.
local hud_type_field_name
if minetest.features.hud_def_type_field then
	-- engine version 5.9.0 and later
	hud_type_field_name = "type"
else
	-- All engine versions before 5.9.0
	hud_type_field_name = "hud_elem_type"
end

areas.hud = {}

minetest.register_globalstep(function(dtime)
	for _, player in pairs(minetest.get_connected_players()) do
		local name = player:get_player_name()
		local pos = vector.round(player:get_pos())
		local areaStrings = {}
		for id, area in pairs(areas:getAreasAtPos(pos)) do
			if not area.hidden then
				table.insert(areaStrings, S("You are here: @1", S(area.name)))
			end
		end
		local areaString = table.concat(areaStrings, "\n")
		local hud = areas.hud[name]
		if not hud then
			hud = {}
			areas.hud[name] = hud
			hud.areasId = player:hud_add({
				[hud_type_field_name] = "text",
				name = "Areas",
				number = 0xFFFFFF,
				position = {x=1, y=0.25},
				offset = {x=-12, y=17},
				text = areaString,
				scale = {x=200, y=60},
				alignment = {x=-1, y=1},
			})
			hud.oldAreas = areaString
			return
		elseif hud.oldAreas ~= areaString then
			player:hud_change(hud.areasId, "text", areaString)
			hud.oldAreas = areaString
		end
	end
end)

minetest.register_on_leaveplayer(function(player)
	areas.hud[player:get_player_name()] = nil
end)