--   This file is part of Reno desktop.
--
--  Reno desktop is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
--
--  Reno desktop is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
--
--  You should have received a copy of the GNU General Public License along with Reno desktop. If not, see <https://www.gnu.org/licenses/>. 
-- Asynchronous XDG data aggregator
local menu_utils = require("menubar.utils")
local menu_gen = require("menubar.menu_gen")
local gears = require("gears")
local json = require("dkjson")
local lib = require("xdg_data")
menu_utils.wm_name = ""

-- Directories to scan for .desktop files
local desktop_dirs = {os.getenv("HOME").."/Desktop"}
local desktop_dirs_complete = 0
local _ = ((table.concat(gears.filesystem.get_xdg_data_dirs(),":") or
"/usr/share:/usr/local/share")..":"..os.getenv("HOME").."/.local/share"):gsub("[^:]*",function(path)
    if gears.filesystem.dir_readable(path.."/applications") then
        table.insert(desktop_dirs, path.."/applications")
    end
end)


-- Global xdg data struct
_G.xdg = lib.init_xdg_struct()
-- Load cached applications
local cache = lib.load_xdg_cache()
-- Add missing category entries as defined by awesome
lib.add_categories(xdg,menu_gen.all_categories)
-- Asynchronous scanning process
lib.async_process_dirs(xdg,desktop_dirs,cache,function(v)
    -- Count completed directory
    desktop_dirs_complete = desktop_dirs_complete + 1
    -- Call a global signal
    awesome.emit_signal("xdg::dir_finished",v)
end)

local count = function(t)
    local n = 0
    for _,_ in pairs(t) do
        n = n + 1
    end
    return n
end

awesome.connect_signal("xdg::dir_finished",function(dir)
    -- We only send the all_finished signal when all directories finished processing
    if desktop_dirs_complete == #desktop_dirs then
        -- Clean up empty categories
        for k,v in pairs(xdg.categories) do
            if count(v.apps) == 0 then
                xdg.categories[k] = nil
            end
        end
        -- Save the cache if it doesn't exist yet
        io.open(gears.filesystem.get_xdg_cache_home()..".reno_xdg_cache.json","w"):write(json.encode(xdg)):close()
        -- Finally, call the all_finished signal
        awesome.emit_signal("xdg::all_finished")
    end
end)

-- Before exiting, save all xdg cache
awesome.connect_signal("exit",function()
    io.open(gears.filesystem.get_xdg_cache_home()..".reno_xdg_cache.json","w"):write(json.encode(xdg)):close()
end)