from abstract_instrument import abstract_instrument
  import socket
  
  #==============================================================================
  
  ALL_VAL_TYPE = ['DCV', 'ACV', 'DCI', 'ACI', 'RES2W', 'RES4W', 'FREQ']
  ALL_CHANNELS = ['101', '102', '103', '104', '105']

  ADDRESS = "192.168.0.72"

  CONF_VAL_TYPE = ['CONF:VOLT:DC', 'CONF:VOLT:AC', 'CONF:CURR:DC', 'CONF:CURR:AC', 'CONF:RES', 'CONF:FRES', 'CONF:FREQ']
  
  #==============================================================================
  
  class AG34972A(abstract_instrument):

  	def __init__(self, channels, vtypes, address):
  		self.address = address
  		self.port = 5025
  		self.channels = channels
  		self.vtypes = vtypes

  	def model(self):
  		#self.send("*IDN?")
  		#return self.read()
  		return "AG34972A"

  	def connect(self):
  		print('Connecting to device @%s:%s...' %(self.address, self.port))
  		self.sock = socket.socket(socket.AF_INET,
  							 socket.SOCK_STREAM,
  							 socket.IPPROTO_TCP)
  		self.sock.settimeout(2.0)	# Don't hang around forever
  		self.sock.connect((self.address, self.port))
  		self.send("SYST:BEEP")
  		print('  --> Ok')
  		print(self.model())
  		self.configure()

  	def configure(self):
  		self.strCh = ''
  		for ch in self.channels:
  			self.send('%s (@%s)'%(CONF_VAL_TYPE[ALL_VAL_TYPE.index(self.vtypes[self.channels.index(ch)])], ch))
  			self.strCh = self.strCh + ch + ','
  		self.strCh = self.strCh[0:-1]
  		self.send("ROUT:SCAN (@%s)"%self.strCh)
  		self.send("TRIG:COUN 1")

  	def getValue(self):
  		self.send("INIT")
  		self.send("FETC?")
  		return self.read()

  	def read(self):
  		ans = ''
  		nb_data_list = []
  		nb_data = ''
  		try:
  			while ans != '
  ':
  				ans = self.sock.recv(1)
  				nb_data_list.append(ans) # Return the number of data
  			list_size = len(nb_data_list)
  			for j in range (0, list_size):
  				nb_data = nb_data+nb_data_list[j]
  			return nb_data
  		except socket.timeout:
  			print "Socket timeout error when reading."
  			raise

  	def disconnect(self):
  		self.send('*RST')
  		self.sock.close()

  	def send(self, command):
  		self.sock.send("%s
  "%command)