import pygst,sys,time,gobject
pygst.require("0.10")
import gst
import gst

from duration import Duration

class Song():
	def __init__(self,file):
		# initialize player pipeline
		self.player = gst.Pipeline("player")
		bin = gst.element_factory_make("playbin",None)
		bin.set_property("uri","file://"+file)
		self.player.add(bin)
		
		# initialize bus
		bus = self.player.get_bus()
		bus.add_signal_watch()
		bus.connect("message",self.onMessage)
		
		# Pause song
		self.pause()

		# Initialize stuff for finding duration
		self.time_format = gst.Format(gst.FORMAT_TIME)
		self.length = None
		
		# Start mainloop
		gobject.threads_init()


	# Called on bus messages
	def onMessage(self,bus,message):
		t = message.type
		if t == gst.MESSAGE_EOS:
			print "End of stream"
			sys.exit(0)
		elif t == gst.MESSAGE_ERROR:
			print "Error"
			sys.exit(0)
		elif t == gst.MESSAGE_TAG:
			print "Tags:"
			# Probably should convert this to some other data structure
			# For easier use later
			taglist = message.parse_tag()
			for key in taglist.keys():
				print key,taglist[key]
			return


	# Change state to "playing"
	def play(self):
		self.player.set_state(gst.STATE_PLAYING)
		# Start main loop and find duration
		# If this hasn't been done yet
		if self.length == None:
			time.sleep(0.2)
			self.duration()


	# Change state to "paused"
	def pause(self):
		self.player.set_state(gst.STATE_PAUSED)


	# Find the duration of the pipeline
	def duration(self):
		self.length = Duration()
		length = self.player.query_duration(self.time_format,None)[0]
		self.length.setTime(length)
		self.length.disp()


	# Print out current running time
	def curTime(self):
		length = self.player.query_position(self.time_format,None)[0]
		return Duration().setTime(length)