--[[

     Awesome-Freedesktop
     Freedesktop.org compliant desktop entries and menu

     Menu section

     Licensed under GNU General Public License v2
      * (c) 2016, Luke Bonham
      * (c) 2014, Harvey Mittens

--]]

local Gio = require('lgi').Gio
local awful_menu = require('awful.menu')
local menu_gen = require('menubar.menu_gen')
local menu_utils = require('menubar.utils')

local io, pairs, string, table, os = io, pairs, string, table, os

-- Expecting a wm_name of awesome omits too many applications and tools
menu_utils.wm_name = ''

-- Menu
-- freedesktop.menu
local menu = {}

-- Check if a path is a directory.
-- @tparam string path The directory path
-- @treturn boolean True if path exists and is a directory
function menu.is_dir(path)
	return Gio.File.new_for_path(path):query_file_type({}) == 'DIRECTORY'
end

-- Remove non existent paths in order to avoid issues
local existent_paths = {}
for k, v in pairs(menu_gen.all_menu_dirs) do
	if menu.is_dir(v) then
		table.insert(existent_paths, v)
	end
end
menu_gen.all_menu_dirs = existent_paths

-- Determines whether an table includes a certain element
-- @param tab a given table
-- @param val the element to search for
-- @return true if the given string is found within the search table; otherwise, false if not
function menu.has_value(tab, val)
	for index, value in pairs(tab) do
		if val:find(value) then
			return true
		end
	end
	return false
end

-- Use MenuBar parsing utils to build a menu for Awesome
-- @return awful.menu
function menu.build(args)
	local args = args or {}
	local before = args.before or {}
	local after = args.after or {}
	local skip_items = args.skip_items or {}
	local sub_menu = args.sub_menu or false

	local result = {}
	local _menu = awful_menu({ items = before })

	menu_gen.generate(function(entries)
		-- Add category icons
		for k, v in pairs(menu_gen.all_categories) do
			table.insert(result, { k, {}, v.icon })
		end

		-- Get items table
		for k, v in pairs(entries) do
			for _, cat in pairs(result) do
				if cat[1] == v.category then
					if not menu.has_value(skip_items, v.name) then
						table.insert(cat[2], { v.name, v.cmdline, v.icon })
					end
					break
				end
			end
		end

		-- Cleanup things a bit
		for i = #result, 1, -1 do
			local v = result[i]
			if #v[2] == 0 then
				-- Remove unused categories
				table.remove(result, i)
			else
				--Sort entries alphabetically (by name)
				table.sort(v[2], function(a, b)
					return string.byte(a[1]) < string.byte(b[1])
				end)
				-- Replace category name with nice name
				v[1] = menu_gen.all_categories[v[1]].name
			end
		end

		-- Sort categories alphabetically also
		table.sort(result, function(a, b)
			return string.byte(a[1]) < string.byte(b[1])
		end)

		-- Add menu item to hold the generated menu
		if sub_menu then
			result = { { sub_menu, result } }
		end

		-- Add items to menu
		for _, v in pairs(result) do
			_menu:add(v)
		end
		for _, v in pairs(after) do
			_menu:add(v)
		end
	end)

	-- Hold the menu in the module
	menu.menu = _menu

	return _menu
end

return menu