#!/usr/bin/env python
#
# Public Domain 2014-present MongoDB, Inc.
# Public Domain 2008-2014 WiredTiger, Inc.
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import wiredtiger, wttest

def timestamp_str(t):
    return '%x' % t

# test_truncate05.py
# Test various fast truncate visibility scenarios
class test_truncate05(wttest.WiredTigerTestCase):
    conn_config = 'cache_size=2MB'
    session_config = 'isolation=snapshot'

    def test_truncate_read_older_than_newest(self):
        uri = 'table:test_truncate05'
        self.session.create(uri, 'key_format=i,value_format=S')
        cursor = self.session.open_cursor(uri)

        value1 = 'a' * 500
        value2 = 'b' * 500

        # Insert a range of keys.
        for i in range(1, 1000):
            self.session.begin_transaction()
            cursor[i] = value1
            self.session.commit_transaction('commit_timestamp=' + timestamp_str(2))

        # Reopen the connection to force all content to disk.
        self.reopen_conn()
        self.session.create(uri, 'key_format=i,value_format=S')
        cursor = self.session.open_cursor(uri)

        # Insert a single update at a later timestamp.
        self.session.begin_transaction()
        cursor[500] = value2
        self.assertEqual(self.session.commit_transaction('commit_timestamp=' + timestamp_str(3)), 0)

        # Insert a bunch of other content to fill the database and evict the committed update.
        for i in range(1000, 20000):
            self.session.begin_transaction()
            cursor[i] = value1
            self.session.commit_transaction('commit_timestamp=' + timestamp_str(4))

        # Start a transaction with an earlier read timestamp than the commit timestamp of the
        # previous update.
        self.session.begin_transaction('read_timestamp=' + timestamp_str(2))

        # Truncate from key 1 to 1000.
        start = self.session.open_cursor(uri, None)
        start.set_key(1)
        end = self.session.open_cursor(uri, None)
        end.set_key(1000)

        # Call the truncate and expect failure.
        self.assertRaisesException(
            wiredtiger.WiredTigerError,lambda: self.session.truncate(None, start, end, None))
        self.session.rollback_transaction()