-- Requires libsocket

-- TODO:

-- do pubsub tunes+notify instead of status hacking

require 'socket'

local settings = {

	hostname     = "localhost",

	password     = nil,

	port         = 6600,

}

mpd = {}

-- separator allows split output into records, that are started by any of present in separator keys

-- returns table of field (lowercase) - value records

-- command status is returned in STATUS field

-- on unexpected errors returns just false, dropping any available data

function mpd.receive_message ( tcp, separator )

	local ret  = {}

	local line = tcp:receive ( '*l' )

	while line and not ( line:find ( '^OK' ) or line:find ( '^ACK' ) ) do

		local key, val = line:match ( '^(.-):%s*(.*)$' )

		if key then

			if separator then

				key = key:lower ()

				if separator[key] then

					table.insert ( ret, {} )

				end

				ret[#ret][key]   = val

			else

				ret[key:lower()] = val

			end

		end

		line = tcp:receive ( '*l' )

	end

	if not line then

		return false -- an error occured, ret, most likely, does not contains exact and complete info...

	else

		ret.STATUS = line:match ( '^%S+' )

		return ret

	end

end

-- use: mpd.call_command { 'status' }

--      mpd.call_command { 'lsinfo misc', list = { file = true, directory = true } }

--      mpd.call_command { 'next', noret = true }

--      mpd.call_command { 'status', 'currentsong' }

-- on one command returns just results of that command, on multi - array of results

-- on errors returns nil

-- noret can terminate socket too early, thus, do not use it with lists of commands

function mpd.call_command ( opts )

	local tcp = socket.tcp ()

	if not tcp then

		print ( 'mpd: cannot get master tcp object' )

		return nil

	elseif not tcp:connect ( settings.hostname, settings.port ) then

		tcp:close ()

		print ( 'mpd: cannot connect to server' )

		return nil

	end

	local ret = {}

	if not opts.noret then

		ret = mpd.receive_message ( tcp )

		if not ret then

			tcp:close ()

			print ( 'mpd: error getting greeting from server' )

			return nil

		elseif ret.STATUS ~= 'OK' then

			print ( 'mpd: server ack\'s in greeting' )

		end

	end

	for num, command in ipairs ( opts ) do

		if not tcp:send ( command .. "\n" ) then

			tcp:close ()

			print ( 'mpd: error sending command ' .. command )

			return nil

		end

		if not opts.noret then

			ret[num] = mpd.receive_message ( tcp, opts.list )

			if not ret[num] then

				print ( 'mpd: error getting result' )

			end

			if ret[num]['STATUS'] ~= 'OK' then

				print ( 'mpd: server acks our command ' .. command )

			end

		end

	end

	tcp:close ()

	if #ret > 1 then

		return ret

	else

		return ret[1]

	end

end

-- MCABBER PART --

mpd_enabled = false

function mpd_getstatus ()

	if not mpd_enabled then

		return ''

	end

	local stats = mpd.call_command { 'status', 'currentsong' }

	if stats[1].state ~= 'play' and stats[1].state ~= 'pause' then

		return ''

	end

	local title = stats[2].title

	if not title then

		if stats[2].file then

			title = stats[2].file

		else

			title = ''

		end

	elseif not stats[2].artist then

		title = string.format ( "%s (%s)", title, stats[2].file )

	else

		title = string.format ( "%s - %s", stats[2].artist, title )

	end

	if stats[1].state == 'pause' then

		return string.format ( "[mpd: <зупинено> %s]", title )

	else

		return string.format ( "[mpd: %s]", title )

	end

end

function parse_status ()

	local stletter, stmessage = main.status ()

	local cmd = char2status[stletter]

	local message, mpd_string = stmessage:match ( "^(.-)%s+(%[mpd:%s+.+%s*%])" )

	if message then

		return cmd, message, mpd_string

	else

		return cmd, stmessage, ''

	end

end

function mpd_callback ()

	local new_mpd_string = mpd_getstatus ()

	local status, message, mpd_string = parse_status ()

	if new_mpd_string ~= mpd_string then

		main.run ( string.format ( 'status %s %s %s', status, message, new_mpd_string ) )

	end

	if mpd_enabled then

		return true

	else

		return false

	end

end

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

function enable_mpd ( yn )

	if yn == nil then

		yn = true

	end

	if yn then

		if not mpd_enabled then

			main.timer ( 15, mpd_callback )

			mpd_enabled = true

			-- update status

		end

	else

		if mpd_enabled then

			mpd_enabled = false

			-- update status

		end

	end

end

main.add_command ( 'mpd',

	function ( args )

		local enable = yesno ( args )

		if enable == nil then

			if mpd_enabled then

				print ( "MPD status string is enabled" )

			else

				print ( "MPD status string is disabled" )

			end

		else

			enable_mpd ( enable )

		end

	end )

commands_help['mpd'] = "[enable|disable|on|off|yes|no|true|false]\n\nSets state of mpd string in your status.\nIf state is omitted, prints current state."

-- vim: se ts=4: --