#
# Copyright (c) 2001 Bizar Software Pty Ltd (http://www.bizarsoftware.com.au/)
# This module is free software, and you may redistribute it and/or modify
# under the same terms as Python, so long as this copyright message and
# disclaimer are retained in their original form.
#
# IN NO EVENT SHALL BIZAR SOFTWARE PTY LTD BE LIABLE TO ANY PARTY FOR
# DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING
# OUT OF THE USE OF THIS CODE, EVEN IF THE AUTHOR HAS BEEN ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# BIZAR SOFTWARE PTY LTD SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
# BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE.  THE CODE PROVIDED HEREUNDER IS ON AN "AS IS"
# BASIS, AND THERE IS NO OBLIGATION WHATSOEVER TO PROVIDE MAINTENANCE,
# SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

import unittest

import pytest
from roundup.hyperdb import DatabaseError
from roundup.backends import get_backend, have_backend

from .db_test_base import DBTest, ROTest, config, SchemaTest, ClassicInitTest
from .db_test_base import ConcurrentDBTest, HTMLItemTest, FilterCacheTest
from .db_test_base import ClassicInitBase, setupTracker, SpecialActionTest
from .rest_common import TestCase as RestTestCase

if not have_backend('postgresql'):
    # FIX: workaround for a bug in pytest.mark.skip():
    #   https://github.com/pytest-dev/pytest/issues/568
    from .pytest_patcher import mark_class
    skip_postgresql = mark_class(pytest.mark.skip(
        reason='Skipping PostgreSQL tests: backend not available'))
else:
    try:
        from roundup.backends.back_postgresql import psycopg2, db_command
        db_command(config, 'select 1')
        skip_postgresql = lambda func, *args, **kwargs: func
    except( DatabaseError ) as msg:
        from .pytest_patcher import mark_class
        skip_postgresql = mark_class(pytest.mark.skip(
            reason='Skipping PostgreSQL tests: database not available'))

@skip_postgresql
class postgresqlOpener:
    if have_backend('postgresql'):
        module = get_backend('postgresql')

    def setup_class(cls):
        # nuke the db once for the class. Handles the case
        # where an aborted test run (^C during setUp for example)
        # leaves the database in an unusable, partly configured state.
        try:
            cls.nuke_database(cls)
        except:
            # ignore failure to nuke the database.
            pass

    def setUp(self):
        pass

    def tearDown(self):
        self.nuke_database()

    def nuke_database(self):
        # clear out the database - easiest way is to nuke and re-create it
        self.module.db_nuke(config)


@skip_postgresql
class postgresqlDBTest(postgresqlOpener, DBTest, unittest.TestCase):
    def setUp(self):
        postgresqlOpener.setUp(self)
        DBTest.setUp(self)

    def tearDown(self):
        DBTest.tearDown(self)
        postgresqlOpener.tearDown(self)

    def testUpgrade_6_to_7(self):

        # load the database
        self.db.issue.create(title="flebble frooz")
        self.db.commit()

        if self.db.database_schema['version'] != 7:
            # consider calling next testUpgrade script to roll back
            # schema to version 7.
            self.skipTest("This test only runs for database version 7")

        # remove __fts table/index; shrink length of  __words._words
        #  trying to insert a long word in __words._words should fail.
        #  trying to select from __fts should fail
        #  looking for the index should fail
        # run post-init
        #    tests should succeed.

        self.db.sql("drop table __fts")  # also drops __fts_idx
        self.db.sql("alter table __words ALTER column _word type varchar(10)")
        self.db.commit()

        self.db.database_schema['version'] = 6

        long_string = "a" * (self.db.indexer.maxlength + 5)
        with self.assertRaises(psycopg2.DataError) as ctx:
            # DataError : value too long for type character varying(10)
            self.db.sql("insert into __words VALUES('%s',1)" % long_string)

        self.assertIn("varying(10)", ctx.exception.args[0])
        self.db.rollback()  # clear cursor error so db.sql can be used again

        with self.assertRaises(psycopg2.errors.UndefinedTable) as ctx:
            self.db.sql("select * from _fts")
        self.db.rollback()

        self.assertFalse(self.db.sql_index_exists('__fts', '__fts_idx'))

        if hasattr(self, "downgrade_only"):
            return

        # test upgrade path
        self.db.post_init()

        # This insert with text of expected column size should succeed
        self.db.sql("insert into __words VALUES('%s',1)" % long_string)

        # verify it fails at one more than the expected column size
        too_long_string = "a" * (self.db.indexer.maxlength + 6)
        with self.assertRaises(psycopg2.DataError) as ctx:
            self.db.sql("insert into __words VALUES('%s',1)" % too_long_string)

        # clean db handle
        self.db.rollback()

        self.assertTrue(self.db.sql_index_exists('__fts', '__fts_idx'))

        self.db.sql("select * from __fts")

        self.assertEqual(self.db.database_schema['version'],
                         self.db.current_db_version)

@skip_postgresql
class postgresqlROTest(postgresqlOpener, ROTest, unittest.TestCase):
    def setUp(self):
        postgresqlOpener.setUp(self)
        ROTest.setUp(self)

    def tearDown(self):
        ROTest.tearDown(self)
        postgresqlOpener.tearDown(self)


@skip_postgresql
class postgresqlConcurrencyTest(postgresqlOpener, ConcurrentDBTest,
                                unittest.TestCase):
    backend = 'postgresql'
    def setUp(self):
        postgresqlOpener.setUp(self)
        ConcurrentDBTest.setUp(self)

    def tearDown(self):
        ConcurrentDBTest.tearDown(self)
        postgresqlOpener.tearDown(self)


@skip_postgresql
class postgresqlJournalTest(postgresqlOpener, ClassicInitBase,
                            unittest.TestCase):
    backend = 'postgresql'
    def setUp(self):
        postgresqlOpener.setUp(self)
        ClassicInitBase.setUp(self)
        self.tracker = setupTracker(self.dirname, self.backend)
        db = self.tracker.open('admin')
        self.id = db.issue.create(title='initial value')
        db.commit()
        db.close()

    def tearDown(self):
        try:
            self.db1.close()
            self.db2.close()
        except psycopg2.InterfaceError as exc:
            if 'connection already closed' in str(exc): pass
            else: raise
        ClassicInitBase.tearDown(self)
        postgresqlOpener.tearDown(self)

    def _test_journal(self, expected_journal):
        id  = self.id
        db1 = self.db1 = self.tracker.open('admin')
        db2 = self.db2 = self.tracker.open('admin')

        t1  = db1.issue.get(id, 'title')
        t2  = db2.issue.get(id, 'title')

        db1.issue.set (id, title='t1')
        db1.commit()
        db1.close()

        # Test testConcurrentRepeatableRead is expected to raise
        # an error when the db2.issue.set() call is executed. 
        try:
            db2.issue.set (id, title='t2')
            db2.commit()    
        finally:
            # Make sure that the db2 connection is closed, even when
            # an error is raised.
            db2.close()
        self.db = self.tracker.open('admin')
        journal = self.db.getjournal('issue', id)
        for n, line in enumerate(journal):
            self.assertEqual(line[4], expected_journal[n])

    def testConcurrentReadCommitted(self):
        expected_journal = [
            {}, {'title': 'initial value'}, {'title': 'initial value'}
        ]
        self._test_journal(expected_journal)

    def testConcurrentRepeatableRead(self):
        self.tracker.config.RDBMS_ISOLATION_LEVEL='repeatable read'
        exc = self.module.TransactionRollbackError
        self.assertRaises(exc, self._test_journal, [])


@skip_postgresql
class postgresqlHTMLItemTest(postgresqlOpener, HTMLItemTest,
                             unittest.TestCase):
    backend = 'postgresql'
    def setUp(self):
        postgresqlOpener.setUp(self)
        HTMLItemTest.setUp(self)

    def tearDown(self):
        HTMLItemTest.tearDown(self)
        postgresqlOpener.tearDown(self)


@skip_postgresql
class postgresqlFilterCacheTest(postgresqlOpener, FilterCacheTest,
                                unittest.TestCase):
    backend = 'postgresql'
    def setUp(self):
        postgresqlOpener.setUp(self)
        FilterCacheTest.setUp(self)

    def tearDown(self):
        FilterCacheTest.tearDown(self)
        postgresqlOpener.tearDown(self)


@skip_postgresql
class postgresqlSchemaTest(postgresqlOpener, SchemaTest, unittest.TestCase):
    def setUp(self):
        postgresqlOpener.setUp(self)
        SchemaTest.setUp(self)

    def tearDown(self):
        SchemaTest.tearDown(self)
        postgresqlOpener.tearDown(self)


@skip_postgresql
class postgresqlClassicInitTest(postgresqlOpener, ClassicInitTest,
                                unittest.TestCase):
    backend = 'postgresql'
    def setUp(self):
        postgresqlOpener.setUp(self)
        ClassicInitTest.setUp(self)

    def tearDown(self):
        ClassicInitTest.tearDown(self)
        postgresqlOpener.tearDown(self)


from .session_common import SessionTest
@skip_postgresql
class postgresqlSessionTest(postgresqlOpener, SessionTest, unittest.TestCase):
    def setUp(self):
        postgresqlOpener.setUp(self)
        SessionTest.setUp(self)
    def tearDown(self):
        SessionTest.tearDown(self)
        postgresqlOpener.tearDown(self)

@skip_postgresql
class postgresqlSpecialActionTestCase(postgresqlOpener, SpecialActionTest,
                             unittest.TestCase):
    backend = 'postgresql'
    def setUp(self):
        postgresqlOpener.setUp(self)
        SpecialActionTest.setUp(self)

    def tearDown(self):
        SpecialActionTest.tearDown(self)
        postgresqlOpener.tearDown(self)

@skip_postgresql
class postgresqlRestTest (RestTestCase, unittest.TestCase):
    backend = 'postgresql'

# vim: set et sts=4 sw=4 :