local mpd    = require 'mpd'

local lm     = require 'lm'

local pubsub = require 'pubsub'

local tune_enabled = false

local mpd_pub_song = { }

pubsub.handler ( 'http://jabber.org/protocol/tune',

	function ( from, node, data )

		local self = false

		if from == lm.connection.bless ( main.connection () ):jid():gsub ( '/.*', '' ) then -- o_O

			self         = true

			mpd_pub_song = { }

		end

		local item = data:child ()

		local text = ''

		while item do

			local name  = item:name ()

			local value = item:value ()

			if self then

				mpd_pub_song[name] = value or ''

			end

			text = ("%s\n- %s: %s"):format ( text, item:name (), item:value () or '' )

			item = item:next ()

		end

		if main.yesno ( main.option ( 'lua_pep_notification' ) ) then

			if text ~= '' then

				text = 'Now listening to:' .. text

			else

				text = 'Now not listening to anything'

			end

		end

		main.print_info ( from, text )

		return true

	end )

local function mpd_getstatus ()

	local status = mpd.call_command { 'status' }

	if not tune_enabled or ( status.state ~= 'play' and status.state ~= 'pause' ) then

		for k, v in pairs ( mpd_pub_song ) do -- if there is anything published, publish nothing

			return { }

		end

		return nil

	end

	local song      = mpd.call_command { 'currentsong' }

	local dir, file = song.file:match ( '(.+)/(.-)' )

	-- populate according to currentsong fields: artist - artist, length - time, source - album, title - title, track - id, rating - ?, uri - ?

	local ret = {

		artist = song.artist or 'Unknown',

		length = song.time,

		source = song.album  or dir,

		title  = song.title  or file,

		track  = song.id,

	}

	if not song.time or song.time == '0' then -- XXX

		ret.length = nil

	end

	local modified = false

	for k, v in pairs ( ret ) do

		if mpd_pub_song[k] ~= v then

			modified = true

			break

		end

	end

	if not modified then

		for k, v in pairs ( mpd_pub_song ) do

			if ret[k] ~= v then

				modified = true

				break

			end

		end

	end

	if modified then

		return ret

	else

		return nil

	end

end

local function mpd_callback ()

	local sdata = mpd_getstatus ()

	if sdata then

		pep.publish ( lm.connection.bless ( main.connection () ), 'http://jabber.org/protocol/tune',

			function ()

			end,

			function ( mesg )

				print ( 'Error publishing tune: ' .. mesg )

			end, sdata )

	end

	if tune_enabled then

		return true

	else

		return false

	end

end

-- do not call it too fast, or you end up with many daemons at once

local function enable_tune ( yn )

	if yn == nil then

		yn = true

	end

	if yn then

		if not tune_enabled then

			main.timer ( 15, mpd_callback )

			tune_enabled = true

			-- update status

		end

	else

		if tune_enabled then

			tune_enabled = false

			-- update status

		end

	end

end

main.command ( 'tune',

	function ( args )

		local enable = main.yesno ( args )

		if enable == nil then

			if tune_enabled then

				print ( "Tune notifications enabled" )

			else

				print ( "Tune notifications disabled" )

			end

		else

			enable_tune ( enable )

		end

	end, false, 'yesno' )

commands_help['tune'] = "[enable|disable|on|off|yes|no|true|false]\n\nEnables or disables publishing of notifications about playing music in your player (currently only mpd is supported)."

hooks_d['hook-post-connect'].tune =

	function ( args )

		if tune_enabled then

			mpd_callback ()

		end

	end

main.add_feature ( 'http://jabber.org/protocol/tune+notify' )

main.add_feature ( 'http://jabber.org/protocol/tune' )

-- vim: se ts=4: --