#!/usr/bin/env python
#
# Public Domain 2014-present MongoDB, Inc.
# Public Domain 2008-2014 WiredTiger, Inc.
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# [TEST_TAGS]
# eviction:prepare
# [END_TAGS]

import wiredtiger, wttest
from wtscenario import make_scenarios

# test_prepare12.py
# Test update restore of a page with prepared update.
class test_prepare12(wttest.WiredTigerTestCase):
    conn_config = 'cache_size=2MB'
    session_config = 'isolation=snapshot'

    key_format_values = [
        ('column', dict(key_format='r')),
        ('integer_row', dict(key_format='i')),
    ]

    scenarios = make_scenarios(key_format_values)

    def test_prepare_update_restore(self):
        uri = "table:test_prepare12"
        self.session.create(uri, 'key_format={},value_format=S'.format(self.key_format))

        # Prepare a transaction
        cursor = self.session.open_cursor(uri, None)
        self.session.begin_transaction()
        cursor[1] = 'a'
        self.session.prepare_transaction('prepare_timestamp=' + self.timestamp_str(1))

        # Insert an uncommitted key
        session2 = self.conn.open_session(None)
        cursor2 = session2.open_cursor(uri, None)
        session2.begin_transaction()
        cursor2[2] = 'b'

        # Insert a bunch of other content to fill the database to trigger eviction.
        session3 = self.conn.open_session(None)
        cursor3 = session3.open_cursor(uri, None)
        for i in range(3, 101):
            session3.begin_transaction()
            cursor3[i] = 'a' * 500
            session3.commit_transaction()

        # Commit the prepared update
        self.session.commit_transaction('commit_timestamp=' + self.timestamp_str(1) + ',durable_timestamp=' + self.timestamp_str(2))

        # Read the prepared update
        self.session.begin_transaction('read_timestamp=' + self.timestamp_str(2))
        self.assertEqual(cursor[1], 'a')
