local widget_types = {
	basic = require("classes/mpc/widget"),
}

local P = {
	name = "mpc"
}
P.__index = P

---
-- Internal methods
---
function P:_cmd(command)
	-- Build complete pamixer arguments, combining sink and options.
	-- Must have a leading space.
	return "mpc --host " .. self.mpd_host .. " " .. command
end

function P:_get_status()
	-- Update mute status and volume.
	-- Values in this table are updated.
	awful.spawn.easy_async(
		self:_cmd("current --format \"title=%title% artist=%artist%\""),
		function(stdout, stderr, exitreason, exitcode)

			if (stdout == "") then
				return
			end

			self.current_title = string.match(stdout, "title=(.*)artist=")
			self.current_artist = string.match(stdout, "artist=(.*)")
			self:_update_widget()
		end
	)

	awful.spawn.easy_async(
		self:_cmd("status"),
		function(stdout, stderr, exitreason, exitcode)

			self.is_playing = string.match(stdout, "(%[playing)") or false
			self.is_paused = string.match(stdout, "(%[paused)") or false
			self.is_stopped = not (self.is_playing or self.is_paused)

			self.volume = string.match(stdout, "volume: ?(%d?%d?%d)%%")
			self:_update_widget()
		end
	)

	-- This is used inside a timer, so return true to keep it running.
	return true
end



function P:_update_widget()
	self.widget:update{
		title = self.current_title,
		artist = self.current_artist,
		play = self.is_playing,
		pause = self.is_paused,
		stop = self.is_stopped,
		volume = self.volume or 0
	}
end

---
-- Simple actions
---
function P:volume_up()
	awful.spawn(self:_cmd("volume +5"), false)
	self:_get_status()
end

function P:volume_down()
	awful.spawn(self:_cmd("volume -5"), false)
	self:_get_status()
end

function P:toggle()
	awful.spawn(self:_cmd("toggle"), false)
	self:_get_status()
end

function P:next()
	awful.spawn(self:_cmd("next"), false)
	self:_get_status()
end

function P:prev()
	awful.spawn(self:_cmd("prev"), false)
	self:_get_status()
end


---
-- Create new volume_interface
---
function P:new(args)
	-- Arguments
	local m = {
		update_interval = args.update_interal or 1,
		widget_type = args.widget_type or "basic",
		mpd_host = args.mpd_host or "localhost",
	}
	setmetatable(m, self)

	-- Create widget for this volume interface
	m.widget = widget_types[m.widget_type]:new()

	m.widget.widget:connect_signal("button::press",
		function(_, _, _, button, mods)
			if (button == 3) or (button == 1)then
				m:toggle()
			end
		end
	)

	m.widget.right:connect_signal("button::press",
		function(_, _, _, button, mods)
			if (button == 4) then -- Scroll up
				m:prev()
			elseif (button == 5) then -- Scroll down
				m:next()
			end
		end
	)


	m.widget.left:connect_signal("button::press",
		function(_, _, _, button, mods)
			if (button == 4) then -- Scroll up
				m:volume_up()
			elseif (button == 5) then -- Scroll down
				m:volume_down()
			end
		end
	)

	-- Polling timer
	m.timer_poll = gears.timer {
		timeout   = m.update_interval,
		call_now  = true,
		autostart = true,
		callback  = function()
			m:_get_status()
		end
	}

	--[[
	-- Timer waiting for changes
	-- DO NOT USE, WILL DOS MPD
	m.timer_wait = gears.timer {
		timeout   = 0.1,
		call_now  = true,
		autostart = true,
		callback  = function()
			awful.spawn.easy_async(
				m:_cmd("current --wait"),
				function(stdout, stderr, exitreason, exitcode)
					m:_get_status()
				end
			)
		end
	}
	--]]

	return m
end

return P