--[[
                                                     
        Licensed under GNU General Public License v2 
        * (c) 2016, Alexandre Terrien                
                                                     
--]]

local helpers      = require("lain.helpers")
local json         = require("lain.util.dkjson")
local focused      = require("awful.screen").focused
local pread        = require("awful.util").pread
local naughty      = require("naughty")
local wibox        = require("wibox")
local next         = next
local os           = { getenv = os.getenv }
local table        = table
local setmetatable = setmetatable

-- Google Play Music Desktop infos
-- lain.widget.contrib.gpmdp
local gpmdp = {}

local function factory(args)
    local args          = args or {}
    local timeout       = args.timeout or 2
    local notify        = args.notify or "off"
    local followtag     = args.followtag or false
    local file_location = args.file_location or
                          os.getenv("HOME") .. "/.config/Google Play Music Desktop Player/json_store/playback.json"
    local settings      = args.settings or function() end

    gpmdp.widget = wibox.widget.textbox()

    gpmdp_notification_preset = {
        title   = "Now playing",
        timeout = 6
    }

    helpers.set_map("gpmdp_current", nil)

    function gpmdp.update()
        local filelines = helpers.lines_from(file_location)

        if not next(filelines) then
            local gpm_now = { running = false, playing = false }
        else
            dict, pos, err = json.decode(table.concat(filelines), 1, nil)
            local gpm_now = {}
            gpm_now.artist    = dict.song.artist
            gpm_now.album     = dict.song.album
            gpm_now.title     = dict.song.title
            gpm_now.cover_url = dict.song.albumArt
            gpm_now.playing   = dict.playing
        end

        if pread("pidof 'Google Play Music Desktop Player'") ~= '' then
            gpm_now.running = true
        else
            gpm_now.running = false
        end

        gpmdp_notification_preset.text = string.format("%s (%s) - %s", gpm_now.artist, gpm_now.album, gpm_now.title)
        widget = gpmdp.widget
        settings()

        if gpm_now.playing then
            if notify == "on" and gpm_now.title ~= helpers.get_map("gpmdp_current") then
                helpers.set_map("gpmdp_current", gpm_now.title)

                if followtag then gpmdp_notification_preset.screen = focused() end

                helpers.async(string.format("curl %d -o /tmp/gpmcover.png", gpm_now.cover_url),
                function(f)
                    gpmdp.id = naughty.notify({
                        preset = gpmdp_notification_preset,
                        icon = "/tmp/gpmcover.png",
                        replaces_id = gpmdp.id
                    }).id
                end)
            end
        elseif not gpm_now.running then
            helpers.set_map("gpmdp_current", nil)
        end
    end

    gpmdp.timer = helpers.newtimer("gpmdp", timeout, gpmdp.update, true, true)

    return gpmdp
end

return setmetatable(gpmdp, { __call = function(_, ...) return factory(...) end })