# simlog.py

import os
import libutil

from libutil import dprint

class SimLog:

	def __init__(self, env):
		self.SimEnvironment = env
		
	def Init(self, logFile, simulation):
		self.LogFile = logFile
		self.Simulation = simulation
		
		header = False
		
		if not(os.path.exists(self.LogFile)):
			header = True
		
		try:
			self.fd = open(self.LogFile, "a+")
		except:
			dprint("Error: could not open %s for writing" % self.LogFile)
			sys.exit(1)
		
		if header:
			self.writeHeader()
	
	def writeHeader(self):
		self.Write("LOG FILE for simulation \"%s\"" % self.Simulation)
		self.Write("================================================================================")
	
	def Write(self, message):
		try:
			if self.SimEnvironment.VERBOSE:
				dprint("[log] %s" % message)
				
			self.fd.write("%s\n" % message)

			self.fd.flush()
			
		except:
			dprint("Error: could not write to logfile %s" % self.LogFile)
			sys.exit(1)
	
	def Close(self):
		try:
			self.fd.close()
		except:
			pass