local widget_types = {
	bar = require("volume/bar_widget"),
	arc = require("volume/arc_widget")
}

local P = {}

---
-- Internal methods
---
function P:_full_args()
	-- Build complete pamixer arguments, combining sink and options.
	-- Must have a leading space.
	if (self.pa_sink == "") then
		return " " .. self.pa_options
	else
		return " --sink" .. self.pa_sink .. " " .. self.pa_options
	end
end

function P:_get_status()
	-- Update mute status and volume.
	-- Values in this table are updated.
	awful.spawn.easy_async(
		"pamixer --get-mute --get-volume" .. self:_full_args(),
		function(stdout, stderr, exitreason, exitcode)

			-- Get mute state
			local muted = string.match(stdout, "(%w%w%w%w%w?) ")
			self.muted = (muted == "true")

			local value = string.match(stdout, "(%d?%d?%d)") -- (\d?\d?\d)\%)

			if (value == nil) then
				self.volume = nil
				self._ready = false
			else
	 			self.volume = tonumber(string.format("% 3d", value))
				self._ready = true
			end

			self:_update_widget()
		end
	)

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



function P:_update_widget()
	if (not self._ready) then
		self.widget:set_state("error")
		self.widget:set_value(self.max_value);
		self.widget:set_tooltip("Volume error");
		return
	end

	self.widget:set_value(self.volume);
	self.widget:set_state(self.muted)
	self.widget:set_tooltip("Volume " .. self.volume .. "%");


	if (self.muted) then
		self.widget:set_state("muted")
	else
		self.widget:set_state("unmuted")
	end
end

---
-- Simple actions
---
function P:volume_up()
	if (not self._ready) or (self.volume >= self.max_value) then
		return
	end

	if self.muted then
		self:unmute()
	end

	awful.spawn("pamixer --increase 5" .. self:_full_args(), false)
	wrapper.sound.play("volume_up")
	self.volume = self.volume + 5
	if self.volume > self.max_value then
		self.volume = self.max_value
	end
	self:_update_widget()
end

function P:volume_down()
	if (not self._ready) or (self.volume <= 0) then
		return
	end

	if self.muted then
		self:unmute()
	end

	awful.spawn("pamixer --decrease 5" .. self:_full_args(), false)
	wrapper.sound.play("volume_down")
	self.volume = self.volume - 5
	if self.volume < 0 then
		self.volume = 0
	end
	self:_update_widget()
end

function P:volume_set(value)
	if (not self._ready) then
		return
	end

	if self.muted then
		self:unmute()
	end

	if (value < 0) then
		value = 0
	end

	if (value > self.max_value) then
		value = self.max_value
	end

	awful.spawn("pamixer --set_volume " .. tostring(value) .. self:_full_args(), false)
	self.volume = value
	self:_update_widget()
end

function P:mute()
	if (not self._ready) then
		return
	end

	self.muted = true
	awful.spawn("pamixer --mute" .. self:_full_args(), false)
	v:_update_widget()
end

function P:unmute()
	if (not self._ready) then
		return
	end

	self.muted = false
	awful.spawn("pamixer --unmute" .. self:_full_args(), false)
	self:_update_widget()
end

function P:toggle_mute()
	if (not self._ready) then
		return
	end

	if self.muted then
		self:unmute()
	else
		self:mute()
	end
end


---
-- Create new volume_interface
---
function P:new(args)
	-- Arguments
	v = {
		pa_options = args.cli_options or "",
		pa_sink = args.pa_sink or "",
		update_interval = args.update_interal or 5,
		enable_tooltip = args.enable_tooltip or true,
		max_value = args.max_value or 100,
		widget_type = args.widget_type or "arc",


		_ready = false, -- is all the information in this class up-to-date?
		-- if this is false, ui will show an error and most methods will
		-- do nothing. Updated in _get_status()
	}

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

	-- Attach button press signals
	v.widget.widget:connect_signal("button::press",
		function(_, _, _, button, mods)
			if (button == 3) then  -- Right-click
				v:toggle_mute()
			elseif (button == 4) then  -- Scroll up
				v:volume_up()
			elseif (button == 5) then  -- Scroll down
				v:volume_down()
			end
		end
	)

	setmetatable(v, self)
	self.__index = self

	-- This timer keeps mute and volume status up-to-date.
	v.timer = gears.timer {
		timeout   = v.update_interval,
		call_now  = true,
		autostart = true,
		callback  = function()
			v:_get_status()
		end
	}

	return v
end

return P