#coding:utf-8
#
# id:           bugs.core_1073
# title:        SINGULAR buggy when nulls present
# decription:
# tracker_id:   CORE-1073
# min_versions: []
# versions:     2.1
# qmid:         bugs.core_1073

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

# version: 2.1
# resources: None

substitutions_1 = []

init_script_1 = """create table t (a integer);
commit;
"""

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

# test_script_1
#---
# def check(step,cur,statement,exp):
#    cur.execute(statement)
#    r = cur.fetchone()
#    if (exp and (r is None)) or (not exp and (r is not None)):
#      print ('Test FAILED in step ',step,', expectation ',exp)
#      print ('Statement:',statement)
#
#  c = db_conn.cursor()
#  p_singular = 'select 1 from rdb$database where singular(select * from t where a = 1)'
#  n_singular = 'select 1 from rdb$database where not(singular(select * from t where a = 1))'
#  p_nsingular = 'select 1 from rdb$database where not singular( select * from t where a = 1)'
#  n_nsingular = 'select 1 from rdb$database where not(not singular(select * from t where a = 1))'
#
#  ins = 'insert into t values (%s)'
#
#  # Step 1
#
#  c.execute(ins % '2')
#  c.execute(ins % 'null')
#  db_conn.commit()
#
#  check(1,c,p_singular,False)
#  check(1,c,n_singular,True)
#  check(1,c,p_nsingular,True)
#  check(1,c,n_nsingular,False)
#
#  c.execute('delete from t')
#  db_conn.commit()
#
#  # Step 2
#
#  c.execute(ins % '1')
#  c.execute(ins % 'null')
#  db_conn.commit()
#
#  check(2,c,p_singular,True)
#  check(2,c,n_singular,False)
#  check(2,c,p_nsingular,False)
#  check(2,c,n_nsingular,True)
#
#  c.execute('delete from t')
#  db_conn.commit()
#
#  # Step 3
#
#  c.execute(ins % '1')
#  c.execute(ins % 'null')
#  c.execute(ins % '1')
#  db_conn.commit()
#
#  check(3,c,p_singular,False)
#  check(3,c,n_singular,True)
#  check(3,c,p_nsingular,True)
#  check(3,c,n_nsingular,False)
#
#  c.execute('delete from t')
#  db_conn.commit()
#
#  # Step 4
#
#  c.execute(ins % '1')
#  c.execute(ins % '1')
#  c.execute(ins % 'null')
#  db_conn.commit()
#
#  check(4,c,p_singular,False)
#  check(4,c,n_singular,True)
#  check(4,c,p_nsingular,True)
#  check(4,c,n_nsingular,False)
#
#  c.execute('delete from t')
#  db_conn.commit()
#
#
#
#---

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

def check(step, cur, statement, exp):
   r = cur.execute(statement).fetchone()
   if (exp and (r is None)) or (not exp and (r is not None)):
      pytest.fail(f'Test FAILED in step {step}, expectation {exp}')

@pytest.mark.version('>=2.1')
def test_1(act_1: Action):
   with act_1.db.connect() as con:
      c = con.cursor()
      #
      p_singular = 'select 1 from rdb$database where singular(select * from t where a = 1)'
      n_singular = 'select 1 from rdb$database where not(singular(select * from t where a = 1))'
      p_nsingular = 'select 1 from rdb$database where not singular( select * from t where a = 1)'
      n_nsingular = 'select 1 from rdb$database where not(not singular(select * from t where a = 1))'
      #
      ins = 'insert into t values (%s)'
      #
      # Step 1
      #
      c.execute(ins % '2')
      c.execute(ins % 'null')
      con.commit()
      #
      check(1, c, p_singular, False)
      check(1, c, n_singular, True)
      check(1, c, p_nsingular, True)
      check(1, c, n_nsingular, False)
      #
      c.execute('delete from t')
      con.commit()
      #
      # Step 2
      #
      c.execute(ins % '1')
      c.execute(ins % 'null')
      con.commit()
      #
      check(2, c, p_singular, True)
      check(2, c, n_singular, False)
      check(2, c, p_nsingular, False)
      check(2, c, n_nsingular, True)
      #
      c.execute('delete from t')
      con.commit()
      #
      # Step 3
      #
      c.execute(ins % '1')
      c.execute(ins % 'null')
      c.execute(ins % '1')
      con.commit()
      #
      check(3, c, p_singular, False)
      check(3, c, n_singular, True)
      check(3, c, p_nsingular, True)
      check(3, c, n_nsingular, False)
      #
      c.execute('delete from t')
      con.commit()
      #
      # Step 4
      #
      c.execute(ins % '1')
      c.execute(ins % '1')
      c.execute(ins % 'null')
      con.commit()
      #
      check(4, c, p_singular, False)
      check(4, c, n_singular, True)
      check(4, c, p_nsingular, True)
      check(4, c, n_nsingular, False)
      #
      c.execute('delete from t')
      con.commit()