#coding:utf-8

"""
ID:          issue-6790
ISSUE:       6790
TITLE:       MON$ATTACHMENTS.MON$TIMESTAMP is incorrect when DefaultTimeZone is configured
  with time zone different from the server's default
DESCRIPTION:
  We make backup of current firebird.conf before changing its parameter DefaultTimeZone to randomly selected value from RDB$TIME_ZONES.
  Then we close current connection and launch child ISQL process that makes *LOCAL* connect to current DB.
  ISQL will obtain mon$session_timezone, mon$timestamp and current_timestamp values from mon$attachments.
  Then it will extract time zone name from current_timestamp string (by call substring() with specifying starting position = 26).

  Values of mon$session_timezone and extracted time zone from current_timestamp must be equals.
  Also, difference between mon$timestamp current_timestamp must be no more than 1..2 seconds (see 'MAX_DIFF_SECONDS' variable).

  ::: NB :::
  1. Affect of changed parameter DefaultTimeZone can be seen only if DB is attached using *LOCAL* protocol.
     Attempt to connect using remote protocol will fail: engine returns previous value of DefaultTimeZone.
     One need to wait at least 130 seconds after changing firebird.conf for new value be returned at this case!
     The reason of that is 10+60+60 seconds which are needed to fully unload shmem-related structures from memory.
     Explanation from Vlad: letter 24.01.2021 18:00, subj: "System audit in FB.  Is there some kind of timeout of 130 seconds ?"
     (it was discussion about attempts make test for CORE-5993)
     See also: http://tracker.firebirdsql.org/browse/CORE-6476

  2. FDB driver loads client library only *once* before this test launch and, in turn, this library reads firebird.conf.
     For this reason we have to launch separate (child) process two times, which will be forced to load firebird.conf
     every launch. This is why subprocess.call(['isql', ...]) is needed here rather than just query DB using cursor of
     pre-existing db_conn connection (see routine 'get_local_time').
NOTES:
[22.05.2021]
  This test initially had wrong value of min_version = 4.0
  Bug was fixed on 4.1.0.2468, build timestamp: 06-may-2021 12:34 thus min_version should be 4.1
  After several days this new FB branch was renamed to 5.0.
  Because of this, min_version for this test is 5.0
FBTEST:      bugs.gh_6790
"""

import pytest
from firebird.qa import *

db = db_factory()

act = python_act('db')

expected_stdout = """
    mon$session_timezone = current_timestamp zone ? => OK, EQUALS.
    mon$timestamp = current_timestamp ? => OK, EQUALS.
"""

@pytest.mark.skip('FIXME: Not IMPLEMENTED')
@pytest.mark.version('>=5.0')
def test_1(act: Action):
    pytest.fail("Not IMPLEMENTED")

# test_script_1
#---
#
#  import os
#  import shutil
#  import time
#  import datetime
#  import subprocess
#  from fdb import services
#
#  os.environ["ISC_USER"] = user_name
#  os.environ["ISC_PASSWORD"] = user_password
#
#  db_name = db_conn.database_name
#  cur =db_conn.cursor()
#  cur.execute('select z.rdb$time_zone_name from rdb$time_zones z order by rand() rows 1')
#  RANDOM_TZ = cur.fetchone()[0]
#  cur.close()
#  db_conn.close()
#
#  MAX_DIFF_SECONDS = 3
#
#  #--------------------------------------------
#
#  def flush_and_close( file_handle ):
#      # https://docs.python.org/2/library/os.html#os.fsync
#      # If you're starting with a Python file object f,
#      # first do f.flush(), and
#      # then do os.fsync(f.fileno()), to ensure that all internal buffers associated with f are written to disk.
#      global os
#
#      file_handle.flush()
#      if file_handle.mode not in ('r', 'rb') and file_handle.name != os.devnull:
#          # otherwise: "OSError: [Errno 9] Bad file descriptor"!
#          os.fsync(file_handle.fileno())
#      file_handle.close()
#
#  #--------------------------------------------
#
#  def cleanup( f_names_list ):
#      global os
#      for f in f_names_list:
#         if type(f) == file:
#            del_name = f.name
#         elif type(f) == str:
#            del_name = f
#         else:
#            print('Unrecognized type of element:', f, ' - can not be treated as file.')
#            del_name = None
#
#         if del_name and os.path.isfile( del_name ):
#             os.remove( del_name )
#
#  #--------------------------------------------
#
#  def get_local_time( fb_home, db_name ):
#
#      global flush_and_close
#      global subprocess
#      global cleanup
#
#      sql_chk='select substring( cast(cast(current_time as time) as varchar(13)) from 1 for 8) from rdb$database'
#
#      f_connect_sql = open( os.path.join(context['temp_directory'],'tmp_6396_check.sql'), 'w')
#      f_connect_sql.write('set heading off; ' + sql_chk + ';' )
#      flush_and_close( f_connect_sql )
#
#      f_connect_log=open( os.path.join(context['temp_directory'],'tmp_6396_check.log'), 'w')
#      subprocess.call( [ context['isql_path'], db_name, "-i", f_connect_sql.name ], stdout=f_connect_log, stderr=subprocess.STDOUT )
#      flush_and_close( f_connect_log )
#
#      changed_time = '00:00:00'
#      with open(f_connect_log.name,'r') as f:
#          for line in f:
#              if line.split():
#                  changed_time = line.strip()
#
#      cleanup( [x.name for x in (f_connect_sql, f_connect_log)] )
#      return changed_time
#
#  #---------------------------------------------
#
#  svc = services.connect(host='localhost', user=user_name, password=user_password)
#  fb_home = svc.get_home_directory()
#  svc.close()
#
#  dts = datetime.datetime.now().strftime("%y%m%d_%H%M%S")
#
#  fbconf_cur = os.path.join(fb_home, 'firebird.conf')
#  fbconf_bak = os.path.join(context['temp_directory'], 'firebird_'+dts+'.bak')
#
#  shutil.copy2( fbconf_cur, fbconf_bak )
#
#  f_fbconf=open( fbconf_cur, 'r')
#  fbconf_content=f_fbconf.readlines()
#  flush_and_close( f_fbconf )
#
#  for i,s in enumerate( fbconf_content ):
#      line = s.lower().lstrip()
#      if line.startswith( 'DefaultTimeZone'.lower() ):
#          fbconf_content[i] = '# [temply commented] ' + s
#
#  text2app='''
#  ### TEMPORARY CHANGED BY FBTEST FRAMEWORK ###
#  DefaultTimeZone = %(RANDOM_TZ)s
#  ##############################################
#  ''' % locals()
#
#  f_fbconf=open( fbconf_cur, 'w')
#  f_fbconf.writelines( fbconf_content + [ '\\n' + x for x in text2app.split('\\n') ] )
#  flush_and_close( f_fbconf )
#  #..........................................
#
#
#  sql_chk='''
#      set list on;
#      select
#           iif( t.mon_session_timezone = t.curent_timestamp_zone,   'OK, EQUALS.', 'POOR: mon$session_timezone = "' || trim(coalesce(mon_session_timezone, '[null]')) || '", curent_timestamp_zone = "' || trim(coalesce(curent_timestamp_zone, '[null]')) || '"' ) as "mon$session_timezone = current_timestamp zone ? =>"
#          ,iif( abs(t.timestamp_diff_seconds) < t.max_diff_seconds, 'OK, EQUALS.', 'POOR: mon$timestamp differs from current_timestamp for more than ' || t.max_diff_seconds ||' seconds.' ) as "mon$timestamp = current_timestamp ? =>"
#      from (
#          select
#              m.mon$session_timezone as mon_session_timezone
#             ,substring(cast(current_timestamp as varchar(255)) from 26) as curent_timestamp_zone
#             ,datediff(second from current_timestamp to m.mon$timestamp) as timestamp_diff_seconds
#             ,%(MAX_DIFF_SECONDS)s as max_diff_seconds
#          from mon$attachments m
#          where m.mon$attachment_id=current_connection
#      ) t;
#  ''' % locals()
#
#  f_connect_sql = open( os.path.join(context['temp_directory'],'tmp_6790_check.sql'), 'w')
#  f_connect_sql.write('set heading off; ' + sql_chk + ';' )
#  flush_and_close( f_connect_sql )
#
#  f_connect_log=open( os.path.join(context['temp_directory'],'tmp_6790_check.log'), 'w')
#
#  ###############
#  ### ACHTUNG ###
#  ###############
#  # LOCAL protocol must be used here!
#  # Attempt to connect using remote protocol will fail: engine returns previous value of DefaultTimeZone.
#  # One need to wait at least 130 seconds after changing firebird.conf for new value be returned at this case!
#  # The reason of that is 10+60+60 seconds which are needed to fully unload shmem-related structures from memory.
#  # Explanation from Vlad: letter 24.01.2021 18:00, subj: "System audit in FB.  Is there some kind of timeout of 130 seconds ?"
#  # (it was discussion about attempts make test for CORE-5993)
#  # See also: http://tracker.firebirdsql.org/browse/CORE-6476
#
#  subprocess.call( [ context['isql_path'], db_name, "-i", f_connect_sql.name ], stdout=f_connect_log, stderr=subprocess.STDOUT )
#
#  flush_and_close( f_connect_log )
#
#  # RESTORE previous content of firebird.conf. This must be done BEFORE drop mapping!
#  shutil.move( fbconf_bak, fbconf_cur )
#
#  with open(f_connect_log.name,'r') as f:
#     for line in f:
#         if line.split():
#             print(line)
#
#  # CLEANUP:
#  ##########
#  time.sleep(1)
#  cleanup( (f_connect_sql, f_connect_log,) )
#
#---