## logger.py
##
## Contributors for this file:
## - Yann Le Boulanger <asterix@lagaule.org>
## - Nikos Kouremenos <kourem@gmail.com>
##
## Copyright (C) 2003-2004 Yann Le Boulanger <asterix@lagaule.org>
##                         Vincent Hanquez <tab@snarc.org>
## Copyright (C) 2005 Yann Le Boulanger <asterix@lagaule.org>
##                    Vincent Hanquez <tab@snarc.org>
##                    Nikos Kouremenos <nkour@jabber.org>
##                    Dimitur Kirov <dkirov@gmail.com>
##                    Travis Shirk <travis@pobox.com>
##                    Norman Rasmussen <norman@rasmussen.co.za>
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published
## by the Free Software Foundation; version 2 only.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.
##

import os
import sys
import time
import datetime

import exceptions
import i18n
_ = i18n._

try:
	from pysqlite2 import dbapi2 as sqlite
except ImportError:
	raise exceptions.PysqliteNotAvailable

if os.name == 'nt':
	try:
		# Documents and Settings\[User Name]\Application Data\Gajim\logs.db
		LOG_DB_PATH = os.path.join(os.environ['appdata'], 'Gajim', 'logs.db')
	except KeyError:
		# win9x, ./logs.db
		LOG_DB_PATH = 'logs.db'
else: # Unices
	LOG_DB_PATH = os.path.expanduser('~/.gajim/logs.db')

try:
	LOG_DB_PATH = LOG_DB_PATH.decode(sys.getfilesystemencoding())
except:
	pass

class Constants:
	def __init__(self):
		(
			self.JID_NORMAL_TYPE,
			self.JID_ROOM_TYPE
		) = range(2)
		
		(
			self.KIND_STATUS,
			self.KIND_GCSTATUS,
			self.KIND_GC_MSG,
			self.KIND_SINGLE_MSG_RECV,
			self.KIND_CHAT_MSG_RECV,
			self.KIND_SINGLE_MSG_SENT,
			self.KIND_CHAT_MSG_SENT
		) = range(7)
		
		(
			self.SHOW_ONLINE,
			self.SHOW_CHAT,
			self.SHOW_AWAY,
			self.SHOW_XA,
			self.SHOW_DND,
			self.SHOW_OFFLINE
		) = range(6)

constants = Constants()

class Logger:
	def __init__(self):
		self.jids_already_in = [] # holds jids that we already have in DB
		
		if not os.path.exists(LOG_DB_PATH):
			# this can happen only the first time (the time we create the db)
			# db is not created here but in src/common/checks_paths.py
			return
		self.init_vars()
		
	def init_vars(self):
		# if locked, wait up to 20 sec to unlock
		# before raise (hopefully should be enough)
		self.con = sqlite.connect(LOG_DB_PATH, timeout = 20.0,
			isolation_level = 'IMMEDIATE')
		self.cur = self.con.cursor()
		
		self.get_jids_already_in_db()

	def get_jids_already_in_db(self):
		self.cur.execute('SELECT jid FROM jids')
		rows = self.cur.fetchall() # list of tupples: [(u'aaa@bbb',), (u'cc@dd',)]
		for row in rows:
			# row[0] is first item of row (the only result here, the jid)
			self.jids_already_in.append(row[0])

	def jid_is_from_pm(self, jid):
		'''if jid is gajim@conf/nkour it's likely a pm one, how we know
		gajim@conf is not a normal guy and nkour is not his resource?
		we ask if gajim@conf is already in jids (with type room jid)
		this fails if user disables logging for room and only enables for
		pm (so higly unlikely) and if we fail we do not go chaos
		(user will see the first pm as if it was message in room's public chat)
		and after that all okay'''
		
		possible_room_jid, possible_nick = jid.split('/', 1)
		
		self.cur.execute('SELECT jid_id FROM jids WHERE jid="%s" AND type=%d' %\
			(possible_room_jid, constants.JID_ROOM_TYPE))
		row = self.cur.fetchone()
		if row is not None:
			return True
		else:
			return False
	
	def get_jid_id(self, jid, typestr = None):
		'''jids table has jid and jid_id
		logs table has log_id, jid_id, contact_name, time, kind, show, message
		so to ask logs we need jid_id that matches our jid in jids table
		this method wants jid and returns the jid_id for later sql-ing on logs
		typestr can be 'ROOM' or anything else depending on the type of JID
		and is only needed to be specified when the JID is new in DB
		'''
		if jid.find('/') != -1: # if it has a /
			jid_is_from_pm = self.jid_is_from_pm(jid)
			if not jid_is_from_pm: # it's normal jid with resource
				jid = jid.split('/', 1)[0] # remove the resource
		if jid in self.jids_already_in: # we already have jids in DB
			self.cur.execute('SELECT jid_id FROM jids WHERE jid="%s"' % jid)
			jid_id = self.cur.fetchone()[0]
		else: # oh! a new jid :), we add it now
			if typestr == 'ROOM':
				typ = constants.JID_ROOM_TYPE
			else:
				typ = constants.JID_NORMAL_TYPE
			self.cur.execute('INSERT INTO jids (jid, type) VALUES (?, ?)', (jid, typ))
			try:
				self.con.commit()
			except sqlite.OperationalError, e:
				print >> sys.stderr, str(e)
			jid_id = self.cur.lastrowid
			self.jids_already_in.append(jid)
		return jid_id
	
	def convert_human_values_to_db_api_values(self, kind, show):
		'''coverts from string style to constant ints for db'''
		if kind == 'status':
			kind_col = constants.KIND_STATUS
		elif kind == 'gcstatus':
			kind_col = constants.KIND_GCSTATUS
		elif kind == 'gc_msg':
			kind_col = constants.KIND_GC_MSG
		elif kind == 'single_msg_recv':
			kind_col = constants.KIND_SINGLE_MSG_RECV
		elif kind == 'single_msg_sent':
			kind_col = constants.KIND_SINGLE_MSG_SENT
		elif kind == 'chat_msg_recv':
			kind_col = constants.KIND_CHAT_MSG_RECV
		elif kind == 'chat_msg_sent':
			kind_col = constants.KIND_CHAT_MSG_SENT

		if show == 'online':
			show_col = constants.SHOW_ONLINE
		elif show == 'chat':
			show_col = constants.SHOW_CHAT
		elif show == 'away':
			show_col = constants.SHOW_AWAY
		elif show == 'xa':
			show_col = constants.SHOW_XA
		elif show == 'dnd':
			show_col = constants.SHOW_DND
		elif show == 'offline':
			show_col = constants.SHOW_OFFLINE
		elif show is None:
			show_col = None
		else: # invisible in GC when someone goes invisible
			# it's a RFC violation .... but we should not crash
			show_col = 'UNKNOWN'
		
		return kind_col, show_col
	
	def commit_to_db(self, values):
		#print 'saving', values
		sql = 'INSERT INTO logs (jid_id, contact_name, time, kind, show, message, subject) VALUES (?, ?, ?, ?, ?, ?, ?)'
		self.cur.execute(sql, values)
		try:
			self.con.commit()
		except sqlite.OperationalError, e:
			print >> sys.stderr, str(e)
	
	def write(self, kind, jid, message = None, show = None, tim = None, subject = None):
		'''write a row (status, gcstatus, message etc) to logs database
		kind can be status, gcstatus, gc_msg, (we only recv for those 3),
		single_msg_recv, chat_msg_recv, chat_msg_sent, single_msg_sent
		we cannot know if it is pm or normal chat message, we try to guess
		see jid_is_from_pm() which is called by get_jid_id()
		
		we analyze jid and store it as follows:
		jids.jid text column will hold JID if TC-related, room_jid if GC-related,
		ROOM_JID/nick if pm-related.'''

		if self.jids_already_in == []: # only happens if we just created the db
			self.con = sqlite.connect(LOG_DB_PATH, timeout = 20.0,
				isolation_level = 'IMMEDIATE')
			self.cur = self.con.cursor()
			
		jid = jid.lower()
		contact_name_col = None # holds nickname for kinds gcstatus, gc_msg
		# message holds the message unless kind is status or gcstatus,
		# then it holds status message
		message_col = message
		subject_col = subject
		if tim:
			time_col = int(float(time.mktime(tim)))
		else:
			time_col = int(float(time.time()))
		
		kind_col, show_col = self.convert_human_values_to_db_api_values(kind,
			show)

		# now we may have need to do extra care for some values in columns
		if kind == 'status': # we store (not None) time, jid, show, msg
			# status for roster items
			jid_id = self.get_jid_id(jid)
			if show is None: # show is None (xmpp), but we say that 'online'
				show_col = constants.SHOW_ONLINE

		elif kind == 'gcstatus':
			# status in ROOM (for pm status see status)
			if show is None: # show is None (xmpp), but we say that 'online'
				show_col = constants.SHOW_ONLINE
			jid, nick = jid.split('/', 1)
			jid_id = self.get_jid_id(jid, 'ROOM') # re-get jid_id for the new jid
			contact_name_col = nick

		elif kind == 'gc_msg':
			if jid.find('/') != -1: # if it has a /
				jid, nick = jid.split('/', 1)
			else:
				# it's server message f.e. error message
				# when user tries to ban someone but he's not allowed to
				nick = None
			jid_id = self.get_jid_id(jid, 'ROOM') # re-get jid_id for the new jid
			contact_name_col = nick
		else:
			jid_id = self.get_jid_id(jid)
		
		if show_col == 'UNKNOWN': # unknown show, do not log
			return
			
		values = (jid_id, contact_name_col, time_col, kind_col, show_col,
			message_col, subject_col)
		self.commit_to_db(values)

	def get_last_conversation_lines(self, jid, restore_how_many_rows,
		pending_how_many, timeout):
		'''accepts how many rows to restore and when to time them out (in minutes)
		(mark them as too old) and number of messages that are in queue
		and are already logged but pending to be viewed,
		returns a list of tupples containg time, kind, message,
		list with empty tupple if nothing found to meet our demands'''
		jid = jid.lower()
		jid_id = self.get_jid_id(jid)
		now = int(float(time.time()))
		timed_out = now - (timeout * 60) # before that they are too old
		# so if we ask last 5 lines and we have 2 pending we get
		# 3 - 8 (we avoid the last 2 lines but we still return 5 asked)
		self.cur.execute('''
			SELECT time, kind, message FROM logs
			WHERE jid_id = %d AND kind IN	(%d, %d, %d, %d) AND time > %d
			ORDER BY time DESC LIMIT %d OFFSET %d
			''' % (jid_id, constants.KIND_SINGLE_MSG_RECV, constants.KIND_CHAT_MSG_RECV,
				constants.KIND_SINGLE_MSG_SENT, constants.KIND_CHAT_MSG_SENT,
				timed_out, restore_how_many_rows, pending_how_many)
			)

		results = self.cur.fetchall()
		results.reverse()
		return results
	
	def get_unix_time_from_date(self, year, month, day):
		# year (fe 2005), month (fe 11), day (fe 25)
		# returns time in seconds for the second that starts that date since epoch
		# gimme unixtime from year month day:
		d = datetime.date(year, month, day)
		local_time = d.timetuple() # time tupple (compat with time.localtime())
		start_of_day = int(time.mktime(local_time)) # we have time since epoch baby :)
		return start_of_day
	
	def get_conversation_for_date(self, jid, year, month, day):
		'''returns contact_name, time, kind, show, message
		for each row in a list of tupples,
		returns list with empty tupple if we found nothing to meet our demands'''
		jid = jid.lower()
		jid_id = self.get_jid_id(jid)
		
		start_of_day = self.get_unix_time_from_date(year, month, day)
		
		seconds_in_a_day = 86400 # 60 * 60 * 24
		last_second_of_day = start_of_day + seconds_in_a_day - 1
		
		self.cur.execute('''
			SELECT contact_name, time, kind, show, message FROM logs
			WHERE jid_id = %d
			AND time BETWEEN %d AND %d
			ORDER BY time
			''' % (jid_id, start_of_day, last_second_of_day))
		
		results = self.cur.fetchall()
		return results

	def get_search_results_for_query(self, jid, query):
		'''returns contact_name, time, kind, show, message
		for each row in a list of tupples,
		returns list with empty tupple if we found nothing to meet our demands'''
		jid = jid.lower()
		jid_id = self.get_jid_id(jid)
		if False: #query.startswith('SELECT '): # it's SQL query
			try:
				self.cur.execute(query)
			except sqlite.OperationalError, e:
				results = [('', '', '', '', str(e))]
				return results
			
		else: # user just typed something, we search in message column
			like_sql = '%' + query + '%'
			self.cur.execute('''
				SELECT contact_name, time, kind, show, message, subject FROM logs
				WHERE jid_id = ? AND message LIKE ?
				ORDER BY time
				''', (jid_id, like_sql))

		results = self.cur.fetchall()
		return results

	def get_days_with_logs(self, jid, year, month, max_day):
		'''returns the list of days that have logs (not status messages)'''
		jid = jid.lower()
		jid_id = self.get_jid_id(jid)
		list = []

		# First select all date of month whith logs we want
		start_of_month = self.get_unix_time_from_date(year, month, 1)
		seconds_in_a_day = 86400 # 60 * 60 * 24
		last_second_of_month = start_of_month + (seconds_in_a_day * max_day) - 1

		self.cur.execute('''
			SELECT time FROM logs
			WHERE jid_id = %d
			AND time BETWEEN %d AND %d
			AND kind NOT IN (%d, %d)
			ORDER BY time
			''' % (jid_id, start_of_month, last_second_of_month,
			constants.KIND_STATUS, constants.KIND_GCSTATUS))
		result = self.cur.fetchall()

		# Copy all interesant time in a temporary table 
		self.cur.execute('CREATE TEMPORARY TABLE blabla(time,INTEGER)') 
		for line in result: 
			self.cur.execute(''' 
				INSERT INTO blabla (time) VALUES (%d) 
				''' % (line[0])) 

		# then search in this small temp table for each day 
		for day in xrange(1, max_day): 
			start_of_day = self.get_unix_time_from_date(year, month, day) 
			last_second_of_day = start_of_day + seconds_in_a_day - 1 

			# just ask one row to see if we have sth for this date 
			self.cur.execute(''' 
				SELECT time FROM blabla 
				WHERE time BETWEEN %d AND %d 
				LIMIT 1 
				''' % (start_of_day, last_second_of_day)) 
			result = self.cur.fetchone() 
			if result: 
				list[0:0]=[day]

		# Delete temporary table 
		self.cur.execute('DROP TABLE blabla') 
		result = self.cur.fetchone()
		return list

	def get_last_date_that_has_logs(self, jid):
		'''returns last time (in seconds since EPOCH) for which
		we had logs (excluding statuses)'''
		jid = jid.lower()
		jid_id = self.get_jid_id(jid)
		self.cur.execute('''
			SELECT time FROM logs
			WHERE jid_id = ?
			AND kind NOT IN (?, ?)
			ORDER BY time DESC LIMIT 1
			''', (jid_id, constants.KIND_STATUS, constants.KIND_GCSTATUS))

		results = self.cur.fetchone()
		if results is not None:
			result = results[0]
		else:
			result = None

		return result