#!/usr/bin/env python
#
# Public Domain 2014-2020 MongoDB, Inc.
# Public Domain 2008-2014 WiredTiger, Inc.
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import time, wiredtiger, wttest
from wtscenario import make_scenarios

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

# test_hs16.py
# Ensure that we don't panic when inserting an update without timestamp to the history store.
class test_hs16(wttest.WiredTigerTestCase):
    conn_config = 'cache_size=5MB'
    session_config = 'isolation=snapshot'
    key_format_values = (
        ('column', dict(key_format='r')),
        ('string', dict(key_format='S'))
    )
    scenarios = make_scenarios(key_format_values)

    def create_key(self,i):
        if self.key_format == 'S':
            return str(i)
        return i

    def test_hs16(self):
        uri = 'table:test_hs16'
        create_params = 'key_format={}, value_format=S'.format(self.key_format)
        self.session.create(uri, create_params)
        cursor = self.session.open_cursor(uri)

        # Insert an update without timestamp
        self.session.begin_transaction()
        cursor[self.create_key(1)] = 'a'
        self.session.commit_transaction()

        # Update an update at timestamp 1
        self.session.begin_transaction()
        cursor[self.create_key(1)] = 'b'
        self.session.commit_transaction('commit_timestamp=' + timestamp_str(1))

        # Open anther session to make the next update without timestamp non-globally visible
        session2 = self.setUpSessionOpen(self.conn)
        cursor2 = session2.open_cursor(uri)
        session2.begin_transaction()
        cursor[self.create_key(2)] = 'a'

        # Update an update without timestamp
        self.session.begin_transaction()
        cursor[self.create_key(1)] = 'c'
        self.session.commit_transaction()

        # Update an update at timestamp 2
        self.session.begin_transaction()
        cursor[self.create_key(1)] = 'd'
        self.session.commit_transaction('commit_timestamp=' + timestamp_str(2))

        # Do a checkpoint, it should not panic
        self.session.checkpoint()