-- Wi-Fi widget type for GNU/Linux using iw
-- Copyright (C) 2016  Marius M. <mellich@gmx.net>
-- Copyright (C) 2017  mutlusun <mutlusun@github.com>
-- Copyright (C) 2019  Nguyễn Gia Phong <vn.mcsinyx@gmail.com>
-- Copyright (C) 2019  Xaver Hellauer <xaver@hellauer.bayern>
--
-- This file is part of Vicious.
--
-- Vicious 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 2 of the
-- License, or (at your option) any later version.
--
-- Vicious 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 Vicious.  If not, see <https://www.gnu.org/licenses/>.

-- {{{ Grab environment
local type = type
local tonumber = tonumber

local helpers = require("vicious.helpers")
local spawn = require("vicious.spawn")
-- }}}

-- Wifiiw: provides wireless information for a requested interface
-- using iw instead of deprecated iwconfig
-- vicious.widgets.wifiiw
local wifiiw_linux = {}

local LINK = "PATH=$PATH:/sbin/:/usr/sbin:/usr/local/sbin iw dev %s link"
local INFO = "PATH=$PATH:/sbin/:/usr/sbin:/usr/local/sbin iw dev %s info"

-- {{{ Wireless widget type
function wifiiw_linux.async(format, warg, callback)
    if type(warg) ~= "string" then return callback{} end
    local winfo = {}

    local function parse_link(stdout)
        winfo["{bssid}"] = stdout:match"Connected to ([%x:]*)" or "N/A"
        winfo["{ssid}"] = stdout:match"SSID: ([^\n]*)" or "N/A"
        winfo["{freq}"] = tonumber(stdout:match"freq: (%d+)" or 0)
        winfo["{sign}"] = -- Signal level can be negative; w/o unit (dBm)
            tonumber(stdout:match"signal: (%-?%d+)" or 0)
        winfo["{linp}"] = -- Link Quality (-100dBm->0%, -50dBm->100%)
            winfo["{sign}"] ~= 0 and 200 + winfo["{sign}"]*2 or 0
        winfo["{rate}"] = -- Transmission rate, without unit (Mb/s)
            tonumber(stdout:match"tx bitrate: ([%d%.]+)" or 0)
    end

    local function parse_info(stdout)
        winfo["{mode}"] = stdout:match"type ([^\n]*)" or "N/A"
        winfo["{chan}"] = tonumber(stdout:match"channel (%d+)" or 0)
        -- Transmission power, without unit (dBm)
        winfo["{txpw}"] = tonumber(stdout:match"txpower (%-?%d+)" or 0)
    end

    spawn.easy_async_with_shell(
        LINK:format(warg),
        function (std_out, std_err, exit_reason, exit_code)
            parse_link(std_out)
            spawn.easy_async_with_shell(
                INFO:format(warg),
                function (stdout, stderr, exitreason, exitcode)
                    parse_info(stdout)
                    callback(winfo)
                end)
        end)
end
-- }}}

return helpers.setasyncall(wifiiw_linux)