from core.experience import Experience, ExperienceParameter
import os

class  ExperienceVLC(Experience):
	SERVER_LOG = "vlc_server.log"
	CLIENT_LOG = "vlc_client.log"
	VLC_BIN = "/home/mininet/vlc/vlc"
	PING_OUTPUT = "ping.log"

	def __init__(self, xpParamFile, mpTopo, mpConfig):
		Experience.__init__(self, xpParamFile, mpTopo, mpConfig)
		self.loadParam()
		self.ping()
		Experience.classicRun(self)

	def ping(self):
		self.mpTopo.commandTo(self.mpConfig.client, "rm " + \
				ExperienceVLC.PING_OUTPUT )
		count = self.xpParam.getParam(ExperienceParameter.PINGCOUNT)
		for i in range(0, self.mpConfig.getClientInterfaceCount()):
			 cmd = self.pingCommand(self.mpConfig.getClientIP(i),
				 self.mpConfig.getServerIP(), n = count)
			 self.mpTopo.commandTo(self.mpConfig.client, cmd)

	def pingCommand(self, fromIP, toIP, n=5):
		s = "ping -c " + str(n) + " -I " + fromIP + " " + toIP + \
				  " >> " + ExperienceVLC.PING_OUTPUT
		print(s)
		return s

	def loadParam(self):
		"""
		todo : param LD_PRELOAD ??
		"""
		self.file = self.xpParam.getParam(ExperienceParameter.VLCFILE)
		self.time = self.xpParam.getParam(ExperienceParameter.VLCTIME)
		# todo
		# self.random_size = self.xpParam.getParam(ExperienceParameter.VLCRANDOMSIZE)

	def prepare(self):
		Experience.prepare(self)
		self.mpTopo.commandTo(self.mpConfig.client, "rm " + \
				ExperienceVLC.CLIENT_LOG )
		self.mpTopo.commandTo(self.mpConfig.client, "Xvfb :66 &")
		self.mpTopo.commandTo(self.mpConfig.server, "rm " + \
				ExperienceVLC.SERVER_LOG )
		if self.file  == "random":
			self.mpTopo.commandTo(self.mpConfig.client,
				"dd if=/dev/urandom of=random bs=1K count=" + \
				self.random_size)

	def getVLCServerCmd(self):
		s = "/etc/init.d/apache2 restart &>" + ExperienceVLC.SERVER_LOG + " "
		print(s)
		return s

	def getVLCClientCmd(self):
		s = "export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/mininet/usr/lib/ && sudo ldconfig && " \
				+ ExperienceVLC.VLC_BIN + " -I dummy --x11-display :66" + \
				" --adaptive-logic 3 --no-loop --play-and-exit " + \
				" http://" + self.mpConfig.getServerIP() + \
				"/" + self.file + " 2>&1 | grep -E '(Neb|halp|bandwidth|late|Buffering|buffering)' > " + ExperienceVLC.CLIENT_LOG
		if self.time != "0" :
			s = s + " &"
		print(s)
		return s

	def clean(self):
		Experience.clean(self)
		if self.file  == "random":
			self.mpTopo.commandTo(self.mpConfig.client, "rm random*")
		self.mpTopo.commandTo(self.mpConfig.client, "pkill Xvfb")
		#todo use cst
		#self.mpTopo.commandTo(self.mpConfig.server, "killall netcat")


	def run(self):
		cmd = self.getVLCServerCmd()
		self.mpTopo.commandTo(self.mpConfig.server, cmd)

		self.mpTopo.commandTo(self.mpConfig.client, "sleep 1")
		cmd = self.getVLCClientCmd()
		self.mpTopo.commandTo(self.mpConfig.client, cmd)

		if self.time != "0" :
			self.mpTopo.commandTo(self.mpConfig.client, "sleep " + self.time)
			self.mpTopo.commandTo(self.mpConfig.client, "pkill -9 -f vlc")

		self.mpTopo.commandTo(self.mpConfig.client, "sleep 2")