#!/usr/bin/env python
#
# Public Domain 2014-present MongoDB, Inc.
# Public Domain 2008-2014 WiredTiger, Inc.
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from helper import simulate_crash_restart
from test_rollback_to_stable01 import test_rollback_to_stable_base
from wiredtiger import stat
from wtdataset import SimpleDataSet
from wtscenario import make_scenarios

# test_rollback_to_stable11.py
# Test the rollback to stable is retrieving the proper history store update.
class test_rollback_to_stable11(test_rollback_to_stable_base):

    format_values = [
        ('column', dict(key_format='r', value_format='S')),
        ('column_fix', dict(key_format='r', value_format='8t')),
        ('row_integer', dict(key_format='i', value_format='S')),
    ]

    prepare_values = [
        ('no_prepare', dict(prepare=False)),
        ('prepare', dict(prepare=True))
    ]

    scenarios = make_scenarios(format_values, prepare_values)

    def conn_config(self):
        config = 'cache_size=1MB,statistics=(all)'
        return config

    def test_rollback_to_stable(self):
        nrows = 1

        # Create a table without logging.
        uri = "table:rollback_to_stable11"
        ds = SimpleDataSet(self, uri, 0, key_format=self.key_format, value_format=self.value_format)
        ds.populate()

        if self.value_format == '8t':
             value_a = 97
             value_b = 98
             value_c = 99
             value_d = 100
        else:
             value_a = "aaaaa" * 100
             value_b = "bbbbb" * 100
             value_c = "ccccc" * 100
             value_d = "ddddd" * 100

        # Pin oldest and stable to timestamp 10.
        self.conn.set_timestamp('oldest_timestamp=' + self.timestamp_str(10) +
            ',stable_timestamp=' + self.timestamp_str(10))

        # Perform several updates.
        self.large_updates(uri, value_a, ds, nrows, self.prepare, 20)
        self.large_updates(uri, value_a, ds, nrows, self.prepare, 20)
        self.large_updates(uri, value_a, ds, nrows, self.prepare, 20)
        self.large_updates(uri, value_b, ds, nrows, self.prepare, 20)

        # Verify data is visible and correct.
        self.check(value_b, uri, nrows, None, 21 if self.prepare else 20)

        # Pin stable to timestamp 28 if prepare otherwise 20.
        # large_updates() prepares at 1 before the timestamp passed (so 29)
        # and this is required to be strictly greater than (not >=) stable.
        if self.prepare:
            self.conn.set_timestamp('stable_timestamp=' + self.timestamp_str(28))
        else:
            self.conn.set_timestamp('stable_timestamp=' + self.timestamp_str(20))

        # Checkpoint to ensure that all the updates are flushed to disk.
        self.session.checkpoint()

        # Simulate a server crash and restart.
        simulate_crash_restart(self, ".", "RESTART")

        # Check that the correct data is seen at and after the stable timestamp.
        self.check(value_b, uri, nrows, None, 20)

        # Perform several updates.
        self.large_updates(uri, value_c, ds, nrows, self.prepare, 30)
        self.large_updates(uri, value_c, ds, nrows, self.prepare, 30)
        self.large_updates(uri, value_c, ds, nrows, self.prepare, 30)
        self.large_updates(uri, value_d, ds, nrows, self.prepare, 30)

        # Verify data is visible and correct.
        self.check(value_d, uri, nrows, None, 31 if self.prepare else 30)

        # Checkpoint to ensure that all the updates are flushed to disk.
        self.session.checkpoint()

        # Simulate a server crash and restart.
        simulate_crash_restart(self, "RESTART", "RESTART2")

        # Check that the correct data is seen at and after the stable timestamp.
        self.check(value_b, uri, nrows, None, 20)
        self.check(value_b, uri, nrows, None, 40)

        stat_cursor = self.session.open_cursor('statistics:', None, None)
        calls = stat_cursor[stat.conn.txn_rts][2]
        hs_removed = stat_cursor[stat.conn.txn_rts_hs_removed][2]
        hs_sweep = stat_cursor[stat.conn.txn_rts_sweep_hs_keys][2]
        keys_removed = stat_cursor[stat.conn.txn_rts_keys_removed][2]
        keys_restored = stat_cursor[stat.conn.txn_rts_keys_restored][2]
        pages_visited = stat_cursor[stat.conn.txn_rts_pages_visited][2]
        upd_aborted = stat_cursor[stat.conn.txn_rts_upd_aborted][2]
        stat_cursor.close()

        self.assertEqual(calls, 0)
        self.assertEqual(keys_removed, 0)
        self.assertEqual(keys_restored, 0)
        self.assertEqual(upd_aborted, 0)
        self.assertGreater(pages_visited, 0)
        self.assertEqual(hs_removed, 4)
        self.assertEqual(hs_sweep, 0)

if __name__ == '__main__':
    wttest.run()