#-*- coding: iso-8859-1 -*-
# pysqlite2/test/regression.py: pysqlite regression tests
#
# Copyright (C) 2006-2010 Gerhard Häring <gh@ghaering.de>
#
# This file is part of pysqlite.
#
# This software is provided 'as-is', without any express or implied
# warranty.  In no event will the authors be held liable for any damages
# arising from the use of this software.
#
# Permission is granted to anyone to use this software for any purpose,
# including commercial applications, and to alter it and redistribute it
# freely, subject to the following restrictions:
#
# 1. The origin of this software must not be misrepresented; you must not
#    claim that you wrote the original software. If you use this software
#    in a product, an acknowledgment in the product documentation would be
#    appreciated but is not required.
# 2. Altered source versions must be plainly marked as such, and must not be
#    misrepresented as being the original software.
# 3. This notice may not be removed or altered from any source distribution.

import datetime
import unittest
import sqlite3 as sqlite
import weakref
from test import support

from unittest.mock import patch


class RegressionTests(unittest.TestCase):
    def setUp(self):
        self.con = sqlite.connect(":memory:")

    def tearDown(self):
        self.con.close()

    def CheckPragmaUserVersion(self):
        # This used to crash pysqlite because this pragma command returns NULL for the column name
        cur = self.con.cursor()
        cur.execute("pragma user_version")

    def CheckPragmaSchemaVersion(self):
        # This still crashed pysqlite <= 2.2.1
        con = sqlite.connect(":memory:", detect_types=sqlite.PARSE_COLNAMES)
        try:
            cur = self.con.cursor()
            cur.execute("pragma schema_version")
        finally:
            cur.close()
            con.close()

    def CheckStatementReset(self):
        # pysqlite 2.1.0 to 2.2.0 have the problem that not all statements are
        # reset before a rollback, but only those that are still in the
        # statement cache. The others are not accessible from the connection object.
        con = sqlite.connect(":memory:", cached_statements=5)
        cursors = [con.cursor() for x in range(5)]
        cursors[0].execute("create table test(x)")
        for i in range(10):
            cursors[0].executemany("insert into test(x) values (?)", [(x,) for x in range(10)])

        for i in range(5):
            cursors[i].execute(" " * i + "select x from test")

        con.rollback()

    def CheckColumnNameWithSpaces(self):
        cur = self.con.cursor()
        cur.execute('select 1 as "foo bar [datetime]"')
        self.assertEqual(cur.description[0][0], "foo bar [datetime]")

        cur.execute('select 1 as "foo baz"')
        self.assertEqual(cur.description[0][0], "foo baz")

    def CheckStatementFinalizationOnCloseDb(self):
        # pysqlite versions <= 2.3.3 only finalized statements in the statement
        # cache when closing the database. statements that were still
        # referenced in cursors weren't closed and could provoke "
        # "OperationalError: Unable to close due to unfinalised statements".
        con = sqlite.connect(":memory:")
        cursors = []
        # default statement cache size is 100
        for i in range(105):
            cur = con.cursor()
            cursors.append(cur)
            cur.execute("select 1 x union select " + str(i))
        con.close()

    @unittest.skipIf(sqlite.sqlite_version_info < (3, 2, 2), 'needs sqlite 3.2.2 or newer')
    def CheckOnConflictRollback(self):
        con = sqlite.connect(":memory:")
        con.execute("create table foo(x, unique(x) on conflict rollback)")
        con.execute("insert into foo(x) values (1)")
        try:
            con.execute("insert into foo(x) values (1)")
        except sqlite.DatabaseError:
            pass
        con.execute("insert into foo(x) values (2)")
        try:
            con.commit()
        except sqlite.OperationalError:
            self.fail("pysqlite knew nothing about the implicit ROLLBACK")

    def CheckWorkaroundForBuggySqliteTransferBindings(self):
        """
        pysqlite would crash with older SQLite versions unless
        a workaround is implemented.
        """
        self.con.execute("create table foo(bar)")
        self.con.execute("drop table foo")
        self.con.execute("create table foo(bar)")

    def CheckEmptyStatement(self):
        """
        pysqlite used to segfault with SQLite versions 3.5.x. These return NULL
        for "no-operation" statements
        """
        self.con.execute("")

    def CheckTypeMapUsage(self):
        """
        pysqlite until 2.4.1 did not rebuild the row_cast_map when recompiling
        a statement. This test exhibits the problem.
        """
        SELECT = "select * from foo"
        con = sqlite.connect(":memory:",detect_types=sqlite.PARSE_DECLTYPES)
        con.execute("create table foo(bar timestamp)")
        con.execute("insert into foo(bar) values (?)", (datetime.datetime.now(),))
        con.execute(SELECT)
        con.execute("drop table foo")
        con.execute("create table foo(bar integer)")
        con.execute("insert into foo(bar) values (5)")
        con.execute(SELECT)

    def CheckErrorMsgDecodeError(self):
        # When porting the module to Python 3.0, the error message about
        # decoding errors disappeared. This verifies they're back again.
        with self.assertRaises(sqlite.OperationalError) as cm:
            self.con.execute("select 'xxx' || ? || 'yyy' colname",
                             (bytes(bytearray([250])),)).fetchone()
        msg = "Could not decode to UTF-8 column 'colname' with text 'xxx"
        self.assertIn(msg, str(cm.exception))

    def CheckRegisterAdapter(self):
        """
        See issue 3312.
        """
        self.assertRaises(TypeError, sqlite.register_adapter, {}, None)

    def CheckSetIsolationLevel(self):
        # See issue 27881.
        class CustomStr(str):
            def upper(self):
                return None
            def __del__(self):
                con.isolation_level = ""

        con = sqlite.connect(":memory:")
        con.isolation_level = None
        for level in "", "DEFERRED", "IMMEDIATE", "EXCLUSIVE":
            with self.subTest(level=level):
                con.isolation_level = level
                con.isolation_level = level.lower()
                con.isolation_level = level.capitalize()
                con.isolation_level = CustomStr(level)

        # setting isolation_level failure should not alter previous state
        con.isolation_level = None
        con.isolation_level = "DEFERRED"
        pairs = [
            (1, TypeError), (b'', TypeError), ("abc", ValueError),
            ("IMMEDIATE\0EXCLUSIVE", ValueError), ("\xe9", ValueError),
        ]
        for value, exc in pairs:
            with self.subTest(level=value):
                with self.assertRaises(exc):
                    con.isolation_level = value
                self.assertEqual(con.isolation_level, "DEFERRED")

    def CheckCursorConstructorCallCheck(self):
        """
        Verifies that cursor methods check whether base class __init__ was
        called.
        """
        class Cursor(sqlite.Cursor):
            def __init__(self, con):
                pass

        con = sqlite.connect(":memory:")
        cur = Cursor(con)
        with self.assertRaises(sqlite.ProgrammingError):
            cur.execute("select 4+5").fetchall()
        with self.assertRaisesRegex(sqlite.ProgrammingError,
                                    r'^Base Cursor\.__init__ not called\.$'):
            cur.close()

    def CheckStrSubclass(self):
        """
        The Python 3.0 port of the module didn't cope with values of subclasses of str.
        """
        class MyStr(str): pass
        self.con.execute("select ?", (MyStr("abc"),))

    def CheckConnectionConstructorCallCheck(self):
        """
        Verifies that connection methods check whether base class __init__ was
        called.
        """
        class Connection(sqlite.Connection):
            def __init__(self, name):
                pass

        con = Connection(":memory:")
        with self.assertRaises(sqlite.ProgrammingError):
            cur = con.cursor()

    def CheckCursorRegistration(self):
        """
        Verifies that subclassed cursor classes are correctly registered with
        the connection object, too.  (fetch-across-rollback problem)
        """
        class Connection(sqlite.Connection):
            def cursor(self):
                return Cursor(self)

        class Cursor(sqlite.Cursor):
            def __init__(self, con):
                sqlite.Cursor.__init__(self, con)

        con = Connection(":memory:")
        cur = con.cursor()
        cur.execute("create table foo(x)")
        cur.executemany("insert into foo(x) values (?)", [(3,), (4,), (5,)])
        cur.execute("select x from foo")
        con.rollback()
        with self.assertRaises(sqlite.InterfaceError):
            cur.fetchall()

    def CheckAutoCommit(self):
        """
        Verifies that creating a connection in autocommit mode works.
        2.5.3 introduced a regression so that these could no longer
        be created.
        """
        con = sqlite.connect(":memory:", isolation_level=None)

    def CheckPragmaAutocommit(self):
        """
        Verifies that running a PRAGMA statement that does an autocommit does
        work. This did not work in 2.5.3/2.5.4.
        """
        cur = self.con.cursor()
        cur.execute("create table foo(bar)")
        cur.execute("insert into foo(bar) values (5)")

        cur.execute("pragma page_size")
        row = cur.fetchone()

    def CheckConnectionCall(self):
        """
        Call a connection with a non-string SQL request: check error handling
        of the statement constructor.
        """
        self.assertRaises(sqlite.Warning, self.con, 1)

    def CheckCollation(self):
        def collation_cb(a, b):
            return 1
        self.assertRaises(sqlite.ProgrammingError, self.con.create_collation,
            # Lone surrogate cannot be encoded to the default encoding (utf8)
            "\uDC80", collation_cb)

    def CheckRecursiveCursorUse(self):
        """
        http://bugs.python.org/issue10811

        Recursively using a cursor, such as when reusing it from a generator led to segfaults.
        Now we catch recursive cursor usage and raise a ProgrammingError.
        """
        con = sqlite.connect(":memory:")

        cur = con.cursor()
        cur.execute("create table a (bar)")
        cur.execute("create table b (baz)")

        def foo():
            cur.execute("insert into a (bar) values (?)", (1,))
            yield 1

        with self.assertRaises(sqlite.ProgrammingError):
            cur.executemany("insert into b (baz) values (?)",
                            ((i,) for i in foo()))

    def CheckConvertTimestampMicrosecondPadding(self):
        """
        http://bugs.python.org/issue14720

        The microsecond parsing of convert_timestamp() should pad with zeros,
        since the microsecond string "456" actually represents "456000".
        """

        con = sqlite.connect(":memory:", detect_types=sqlite.PARSE_DECLTYPES)
        cur = con.cursor()
        cur.execute("CREATE TABLE t (x TIMESTAMP)")

        # Microseconds should be 456000
        cur.execute("INSERT INTO t (x) VALUES ('2012-04-04 15:06:00.456')")

        # Microseconds should be truncated to 123456
        cur.execute("INSERT INTO t (x) VALUES ('2012-04-04 15:06:00.123456789')")

        cur.execute("SELECT * FROM t")
        values = [x[0] for x in cur.fetchall()]

        self.assertEqual(values, [
            datetime.datetime(2012, 4, 4, 15, 6, 0, 456000),
            datetime.datetime(2012, 4, 4, 15, 6, 0, 123456),
        ])

    def CheckInvalidIsolationLevelType(self):
        # isolation level is a string, not an integer
        self.assertRaises(TypeError,
                          sqlite.connect, ":memory:", isolation_level=123)


    def CheckNullCharacter(self):
        # Issue #21147
        con = sqlite.connect(":memory:")
        self.assertRaises(ValueError, con, "\0select 1")
        self.assertRaises(ValueError, con, "select 1\0")
        cur = con.cursor()
        self.assertRaises(ValueError, cur.execute, " \0select 2")
        self.assertRaises(ValueError, cur.execute, "select 2\0")

    def CheckCommitCursorReset(self):
        """
        Connection.commit() did reset cursors, which made sqlite3
        to return rows multiple times when fetched from cursors
        after commit. See issues 10513 and 23129 for details.
        """
        con = sqlite.connect(":memory:")
        con.executescript("""
        create table t(c);
        create table t2(c);
        insert into t values(0);
        insert into t values(1);
        insert into t values(2);
        """)

        self.assertEqual(con.isolation_level, "")

        counter = 0
        for i, row in enumerate(con.execute("select c from t")):
            with self.subTest(i=i, row=row):
                con.execute("insert into t2(c) values (?)", (i,))
                con.commit()
                if counter == 0:
                    self.assertEqual(row[0], 0)
                elif counter == 1:
                    self.assertEqual(row[0], 1)
                elif counter == 2:
                    self.assertEqual(row[0], 2)
                counter += 1
        self.assertEqual(counter, 3, "should have returned exactly three rows")

    def CheckBpo31770(self):
        """
        The interpreter shouldn't crash in case Cursor.__init__() is called
        more than once.
        """
        def callback(*args):
            pass
        con = sqlite.connect(":memory:")
        cur = sqlite.Cursor(con)
        ref = weakref.ref(cur, callback)
        cur.__init__(con)
        del cur
        # The interpreter shouldn't crash when ref is collected.
        del ref
        support.gc_collect()

    def CheckDelIsolation_levelSegfault(self):
        with self.assertRaises(AttributeError):
            del self.con.isolation_level


class UnhashableFunc:
    __hash__ = None

    def __init__(self, return_value=None):
        self.calls = 0
        self.return_value = return_value

    def __call__(self, *args, **kwargs):
        self.calls += 1
        return self.return_value


class UnhashableCallbacksTestCase(unittest.TestCase):
    """
    https://bugs.python.org/issue34052

    Registering unhashable callbacks raises TypeError, callbacks are not
    registered in SQLite after such registration attempt.
    """
    def setUp(self):
        self.con = sqlite.connect(':memory:')

    def tearDown(self):
        self.con.close()

    def test_progress_handler(self):
        f = UnhashableFunc(return_value=0)
        with self.assertRaisesRegex(TypeError, 'unhashable type'):
            self.con.set_progress_handler(f, 1)
        self.con.execute('SELECT 1')
        self.assertFalse(f.calls)

    def test_func(self):
        func_name = 'func_name'
        f = UnhashableFunc()
        with self.assertRaisesRegex(TypeError, 'unhashable type'):
            self.con.create_function(func_name, 0, f)
        msg = 'no such function: %s' % func_name
        with self.assertRaisesRegex(sqlite.OperationalError, msg):
            self.con.execute('SELECT %s()' % func_name)
        self.assertFalse(f.calls)

    def test_authorizer(self):
        f = UnhashableFunc(return_value=sqlite.SQLITE_DENY)
        with self.assertRaisesRegex(TypeError, 'unhashable type'):
            self.con.set_authorizer(f)
        self.con.execute('SELECT 1')
        self.assertFalse(f.calls)

    def test_aggr(self):
        class UnhashableType(type):
            __hash__ = None
        aggr_name = 'aggr_name'
        with self.assertRaisesRegex(TypeError, 'unhashable type'):
            self.con.create_aggregate(aggr_name, 0, UnhashableType('Aggr', (), {}))
        msg = 'no such function: %s' % aggr_name
        with self.assertRaisesRegex(sqlite.OperationalError, msg):
            self.con.execute('SELECT %s()' % aggr_name)


class RecursiveUseOfCursors(unittest.TestCase):
    # GH-80254: sqlite3 should not segfault for recursive use of cursors.
    msg = "Recursive use of cursors not allowed"

    def setUp(self):
        self.con = sqlite.connect(":memory:",
                                  detect_types=sqlite.PARSE_COLNAMES)
        self.cur = self.con.cursor()
        self.cur.execute("create table test(x foo)")
        self.cur.executemany("insert into test(x) values (?)",
                             [("foo",), ("bar",)])

    def tearDown(self):
        self.cur.close()
        self.con.close()
        del self.cur
        del self.con

    def test_recursive_cursor_init(self):
        conv = lambda x: self.cur.__init__(self.con)
        with patch.dict(sqlite.converters, {"INIT": conv}):
            with self.assertRaisesRegex(sqlite.ProgrammingError, self.msg):
                self.cur.execute(f'select x as "x [INIT]", x from test')

    def test_recursive_cursor_close(self):
        conv = lambda x: self.cur.close()
        with patch.dict(sqlite.converters, {"CLOSE": conv}):
            with self.assertRaisesRegex(sqlite.ProgrammingError, self.msg):
                self.cur.execute(f'select x as "x [CLOSE]", x from test')

    def test_recursive_cursor_fetch(self):
        conv = lambda x, l=[]: self.cur.fetchone() if l else l.append(None)
        with patch.dict(sqlite.converters, {"ITER": conv}):
            self.cur.execute(f'select x as "x [ITER]", x from test')
            with self.assertRaisesRegex(sqlite.ProgrammingError, self.msg):
                self.cur.fetchall()


def suite():
    regression_suite = unittest.makeSuite(RegressionTests, "Check")
    return unittest.TestSuite((
        regression_suite,
        unittest.makeSuite(UnhashableCallbacksTestCase),
        unittest.makeSuite(RecursiveUseOfCursors),
    ))

def test():
    runner = unittest.TextTestRunner()
    runner.run(suite())

if __name__ == "__main__":
    test()