-------------------------------------------------
-- Volume Arc Widget for Awesome Window Manager
-- Shows the current volume level
-- More details could be found here:
-- https://github.com/streetturtle/awesome-wm-widgets/tree/master/volumearc-widget

-- @author Pavel Makhov
-- @copyright 2018 Pavel Makhov
-------------------------------------------------

local awful = require("awful")
local beautiful = require("beautiful")
local spawn = require("awful.spawn")
local watch = require("awful.widget.watch")
local wibox = require("wibox")

local GET_VOLUME_CMD = 'amixer -D pulse sget Master'
local INC_VOLUME_CMD = 'amixer -D pulse sset Master 5%+'
local DEC_VOLUME_CMD = 'amixer -D pulse sset Master 5%-'
local TOG_VOLUME_CMD = 'amixer -D pulse sset Master toggle'

local PATH_TO_ICON = "/usr/share/icons/Arc/status/symbolic/audio-volume-muted-symbolic.svg"

local widget = {}

local function worker(args)

    local args = args or {}

    local main_color = args.main_color or beautiful.fg_color
    local mute_color = args.mute_color or beautiful.fg_urgent
    local path_to_icon = args.path_to_icon or PATH_TO_ICON
    local thickness = args.thickness or 2
    local height = args.height or 18

    local get_volume_cmd = args.get_volume_cmd or GET_VOLUME_CMD
    local inc_volume_cmd = args.inc_volume_cmd or INC_VOLUME_CMD
    local dec_volume_cmd = args.dec_volume_cmd or DEC_VOLUME_CMD
    local tog_volume_cmd = args.tog_volume_cmd or TOG_VOLUME_CMD

    local icon = {
        id = "icon",
        image = path_to_icon,
        resize = true,
        widget = wibox.widget.imagebox,
    }

    local volumearc = wibox.widget {
        icon,
        max_value = 1,
        thickness = thickness,
        start_angle = 4.71238898, -- 2pi*3/4
        forced_height = height,
        forced_width = height,
        bg = "#ffffff11",
        paddings = 2,
        widget = wibox.container.arcchart
    }

    local update_graphic = function(widget, stdout, _, _, _)
        local mute = string.match(stdout, "%[(o%D%D?)%]")   -- \[(o\D\D?)\] - [on] or [off]
        local volume = string.match(stdout, "(%d?%d?%d)%%") -- (\d?\d?\d)\%)
        volume = tonumber(string.format("% 3d", volume))

        widget.value = volume / 100;
        widget.colors = mute == 'off'
                and { mute_color }
                or { main_color }
    end

    volumearc:connect_signal("button::press", function(_, _, _, button)
        if (button == 4) then awful.spawn(inc_volume_cmd, false)
        elseif (button == 5) then awful.spawn(dec_volume_cmd, false)
        elseif (button == 1) then awful.spawn(tog_volume_cmd, false)
        end

        spawn.easy_async(get_volume_cmd, function(stdout, stderr, exitreason, exitcode)
            update_graphic(volumearc, stdout, stderr, exitreason, exitcode)
        end)
    end)

    watch(get_volume_cmd, 1, update_graphic, volumearc)

    return volumearc
end

return setmetatable(widget, { __call = function(_, ...) return worker(...) end })