--[[

     Licensed under GNU General Public License v2
      * (c) 2013, Luca CPZ
      * (c) 2010, Adrian C. <anrxc@sysphere.org>

--]]

local helpers = require('lain.helpers')
local shell = require('awful.util').shell
local wibox = require('wibox')
local string = string

-- ALSA volume
-- lain.widget.alsa

local function factory(args)
	args = args or {}
	local alsa = { widget = args.widget or wibox.widget.textbox() }
	local timeout = args.timeout or 5
	local settings = args.settings or function() end

	alsa.cmd = args.cmd or 'amixer'
	alsa.channel = args.channel or 'Master'
	alsa.togglechannel = args.togglechannel

	local format_cmd = string.format('%s get %s', alsa.cmd, alsa.channel)

	if alsa.togglechannel then
		format_cmd = {
			shell,
			'-c',
			string.format('%s get %s; %s get %s', alsa.cmd, alsa.channel, alsa.cmd, alsa.togglechannel),
		}
	end

	alsa.last = {}

	function alsa.update()
		helpers.async(format_cmd, function(mixer)
			local l, s = string.match(mixer, '([%d]+)%%.*%[([%l]*)')
			l = tonumber(l)
			if alsa.last.level ~= l or alsa.last.status ~= s then
				volume_now = { level = l, status = s }
				widget = alsa.widget
				settings()
				alsa.last = volume_now
			end
		end)
	end

	helpers.newtimer(string.format('alsa-%s-%s', alsa.cmd, alsa.channel), timeout, alsa.update)

	return alsa
end

return factory