# Core Python Imports
import sys
from datetime import datetime

# Append SA-Hydra/bin to the Python path

from splunk.clilib.bundle_paths import make_splunkhome_path
sys.path.append(make_splunkhome_path(['etc', 'apps', 'SA-Hydra', 'bin']))

# Import TA-VMware collection code

import vim25.events
import vim25.utils
from vim25.connection import Connection
from ta_vmware.models import TAVMwareCacheStanza

import hydra

class BaseEventHandler(hydra.HydraHandler):
	"""
	Things all event handlers need
	"""
	def _prepare_timestamps(self, *args):
		"""
		Input: varargs list of datetime objects (assumed UTC).
		Output: UTC datetime(s) corresponding to the server clock that are guaranteed to have
				correct tzinfo field. Outputs single object for a single input argument, a list 
				for multiple input arguments.
		"""
		results = vim25.utils.AddUtcTzinfo(vim25.utils.ConvertToServerTime(args, Connection.svcInstance, zone="UTC")) 
		return results[0] if len(results) == 1 else results
	cache_model = TAVMwareCacheStanza

class EventHandler(BaseEventHandler):
	"""
	Handler for running the Event collection 
	"""
	def run(self, session, config, create_time, last_time ):
		"""
		This is the method you must implement to perform your atomic task
		args:
			session - the session object return by the loginToTarget method
			config - the dictionary of all the config keys from your stanza in the collection.conf
			create_time - the time this task was created/scheduled to run (datetime object)
			last_time - the last time this task was created/scheduler to run (datetime object)
		
		RETURNS True if successful, False otherwise
		"""
		try:
			#Handle the destination index for the data, note that we must handle empty strings and change them to None
			dest_index = config.get("taskevent_index", False)
			if not dest_index:
				dest_index = None
			start_time, end_time = self._prepare_timestamps(last_time, create_time)
			self.logger.debug("[EventHandler] DEBUGTIME location=event_handlers.py start_time=%s end_time=%s", start_time, end_time)
			events = vim25.events.CollectEvents(startTime=start_time, endTime=end_time)
			self.logger.debug("[EventHandler] Finished Collecting Events")
			#self.logger.debug(events)
			self.logger.debug("[EventHandler] Processing Events")
			if events is None: events = []
			for event in events:
				event.eventClass=event.__class__.__name__
				#self.logger.debug(event)
				self.logger.debug("[EventHandler] Flattening Event")
				flatEvent = vim25.utils.FlattenSingleTaskEvent(event)
				self.logger.debug("[EventHandler] Outputting Event")
				sourcename = "Username:" + (event.userName if hasattr(event, 'userName') and event.userName is not None else "N/A")
				self.logger.info("[Event Handler] Sending time as: "+ str((event.createdTime.replace(tzinfo=None)-datetime(1970,1,1)).total_seconds()))
				# python does not support tzinfo in strftime('%s') so we need to actually calculate time offset in seconds from epoch.
				self.output.sendData(flatEvent, host=session[0], sourcetype="vmware:events",
                                                     source=sourcename, time=str((event.createdTime.replace(tzinfo=None)-datetime(1970,1,1)).total_seconds()), index=dest_index)
			self.logger.debug("[EventHandler] Finished Event Collection and Processing")
			return True
		except Exception as e:
			self.logger.exception(e)
			return False