#coding:utf-8
#
# id:           bugs.gh_6872
# title:        Indexed STARTING WITH execution is very slow with UNICODE collation
# decription:
#                   https://github.com/FirebirdSQL/firebird/issues/6872
#
#                   21.11.2021. Totally re-implemented, package 'psutil' must be installed.
#
#                   We make two calls of psutil.Process(fb_pid).cpu_times() (before and after SQL code) and obtain CPU User Time
#                   values from each result.
#                   Difference between them can be considered as much more accurate performance estimation.
#
#                   Test creates two tables and two procedures for measuring performance of STARTING WITH operator when it is applied
#                   to the table WITH or WITHOUNT unicode collation.
#
#                   On each calls of procedural code (see variable N_MEASURES) dozen execution of 'SELECT ... FROM <T> WHERE <T.C> starting with ...'
#                   are performed, where names '<T>' and '<T.C>' points to apropriate table and column (with or without collation).
#                   Number of iterations within procedures is defined by variable N_COUNT_PER_MEASURE.
#
#                   Each result (difference between cpu_times().user values when PSQL code finished) is added to the list.
#                   Finally, we evaluate MEDIAN of ratio values between cpu user time which was received for both of procedures.
#                   If this median is less then threshold (see var. ADDED_COLL_TIME_MAX_RATIO) then result can be considered as ACCEPTABLE.
#
#                   See also:
#                   https://psutil.readthedocs.io/en/latest/#psutil.cpu_times
#
#                   Checked on Windows:
#                   * builds before/without fix:
#                       3.0.8.33540: median = 16.30;
#                       4.0.1.2520:  median = 47.65
#                       5.0.0.85:    median = 43.14
#                   * builds after fix:
#                       4.0.1.2668:  median = 1.70
#                       5.0.0.313:   median = 1.80
#
# tracker_id:
# min_versions: ['4.0.1']
# versions:     4.0.1
# qmid:         None

import pytest
from firebird.qa import db_factory, python_act, Action

# version: 4.0.1
# resources: None

substitutions_1 = []

init_script_1 = """
    recreate table test_utf8_miss_coll (c1 varchar(10) character set utf8);
    create index test_utf8_miss_coll_idx on test_utf8_miss_coll (c1);

    recreate table test_utf8_with_coll(c1 varchar(10) character set utf8 collate unicode);
    create index test_utf8_with_coll_idx on test_utf8_with_coll(c1);
  """

db_1 = db_factory(sql_dialect=3, init=init_script_1)

# test_script_1
#---
#
#  import os
#  import psutil
#  import time
#
#  os.environ["ISC_USER"] = user_name
#  os.environ["ISC_PASSWORD"] = user_password
#
#  #------------------
#  def median(lst):
#      n = len(lst)
#      s = sorted(lst)
#      return (sum(s[n//2-1:n//2+1])/2.0, s[n//2])[n % 2] if n else None
#  #------------------
#
#  ###########################
#  ###   S E T T I N G S   ###
#  ###########################
#  # Number of PSQL calls:
#  N_MEASURES = 30
#
#  # How many iterations must be done in each of stored procedures when they work:
#  N_COUNT_PER_MEASURE = 100000
#
#  # Maximal value for MEDIAN of ratios between CPU user time when comparison was made.
#  #
#  ADDED_COLL_TIME_MAX_RATIO = 2.0
#  ###############################
#
#
#  sp_make_proc_ddl='''    -- x_name = 'with_coll' | 'miss_col'
#      create or alter procedure sp_%(x_name)s ( n_count int = 1000000 ) as
#          declare v smallint;
#      begin
#          while (n_count > 0) do
#          begin
#              select 1 from test_utf8_%(x_name)s where c1 starting with 'x' into v;
#              n_count = n_count - 1;
#          end
#      end
#  '''
#
#
#  name_suffixes = ( 'with_coll', 'miss_coll' )
#  for x_name in name_suffixes:
#      db_conn.execute_immediate( sp_make_proc_ddl % locals() )
#
#  db_conn.commit()
#
#  cur=db_conn.cursor()
#  cur.execute('select mon$server_pid as p from mon$attachments where mon$attachment_id = current_connection')
#  fb_pid = int(cur.fetchone()[0])
#
#  # --------------------------------------
#  sp_time = {}
#
#  for i in range(0, N_MEASURES):
#      for x_name in name_suffixes:
#
#          fb_info_init = psutil.Process(fb_pid).cpu_times()
#          cur.callproc( 'sp_%(x_name)s' % locals(), (N_COUNT_PER_MEASURE,) )
#          fb_info_curr = psutil.Process(fb_pid).cpu_times()
#
#          sp_time[ x_name, i ]  = max(fb_info_curr.user - fb_info_init.user, 0.000001)
#
#  #---------------------------------------
#  cur.close()
#
#  ratio_lst = []
#  for i in range(0, N_MEASURES):
#      ratio_lst.append( sp_time['with_coll',i]  / sp_time['miss_coll',i]  )
#
#  median_ratio = median(ratio_lst)
#
#
#  # print( 'Duration ratio: ' + ('acceptable' if median_ratio < UTF8_TO_PTBR_MAX_RATIO else 'POOR: %s, more than threshold: %s' % ( '{:9g}'.format(median_ratio), '{:9g}'.format(UTF8_TO_PTBR_MAX_RATIO) ) ) )
#
#  if median(ratio_lst) <= ADDED_COLL_TIME_MAX_RATIO:
#      print('Duration ratio: acceptable.')
#  else:
#      print('Duration ratio: POOR: %s, more than threshold: %s' % ( '{:9g}'.format(median_ratio), '{:9g}'.format(ADDED_COLL_TIME_MAX_RATIO) ) )
#
#      print("\\nCheck sp_time values:" )
#      for k,v in sorted(sp_time.items()):
#          print('k=',k,';  v=',v)
#
#      print('\\nCheck ratio values:')
#      for i,p in enumerate(ratio_lst):
#          print( "%d : %12.2f" % (i,p) )
#      print('\\nMedian value: %12.2f' % median_ratio)
#
#---

act_1 = python_act('db_1', substitutions=substitutions_1)

expected_stdout_1 = """
    Duration ratio: acceptable.
"""

@pytest.mark.skip('FIXME: Not IMPLEMENTED')
@pytest.mark.version('>=4.0.1')
def test_1(act_1: Action):
    pytest.fail("Not IMPLEMENTED")