local wibox = require("wibox")
local layout = require("awful.layout")

local screen_widgets = {} -- need one widget per screen

local layout_icons = {
	cornernw   = "TT=",
	cornerne   = "=TT",
	cornersw   = "LL=",
	cornerse   = "=LL",
	fairh      = "#_#",
	fairv      = "##H",
	max        = "[M]",
	floating   = "><>",
	magnifier  = "=O=",
	fullscreen = "[*]",
	spiral     = "[]@",
	dwindle    = "[]\\",
	tile       = "[]=",
	tiletop    = "LLL",
	tilebottom = "TTT",
	tileleft   = "=[]",
}

function update(screen_index)
	local s = screen[screen_index or 1]
	local w = screen_widgets[s]
	local l = layout.get(s)

	-- create widget if not existing
	if w == nil then
		screen_widgets[s] = { widget = wibox.widget.textbox(), layout = l }
		w = screen_widgets[s]
		--w._layoutbox_tooltip = tooltip {objects = {w}, delay_show = 1}

	-- skip if no change
	elseif w.layout == l then
		return
	end

	-- set widget
	local name = layout.getname(l)
	--w._layoutbox_tooltip:set_text(name)
	w.widget:set_text(layout_icons[name]) -- TODO handle nil
	return w.widget
end

function update_screens()
	for s, w in pairs(boxes) do
		if s.valid then
			update(s)
		end
	end
end

function update_current_tag(t)
	update(t.screen)
end

tag.connect_signal("property::selected", update_current_tag)
tag.connect_signal("property::layout",   update_current_tag)
tag.connect_signal("property::screen",   update_screens)

return update