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

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

# test_rollback_to_stable06.py
# Test that rollback to stable removes all keys when the stable timestamp is earlier than
# all commit timestamps.
class test_rollback_to_stable06(test_rollback_to_stable_base):
    session_config = 'isolation=snapshot'

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

    in_memory_values = [
        ('no_inmem', dict(in_memory=False)),
        ('inmem', dict(in_memory=True))
    ]

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

    scenarios = make_scenarios(key_format_values, in_memory_values, prepare_values)

    def conn_config(self):
        config = 'cache_size=50MB,statistics=(all)'
        if self.in_memory:
            config += ',in_memory=true'
        else:
            config += ',log=(enabled),in_memory=false'
        return config

    def test_rollback_to_stable(self):
        nrows = 1000

        # Prepare transactions for column store table is not yet supported.
        if self.prepare and self.key_format == 'r':
            self.skipTest('Prepare transactions for column store table is not yet supported')

        # Create a table without logging.
        uri = "table:rollback_to_stable06"
        ds = SimpleDataSet(
            self, uri, 0, key_format=self.key_format, value_format="S", config='log=(enabled=false)')
        ds.populate()

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

        value_a = "aaaaa" * 100
        value_b = "bbbbb" * 100
        value_c = "ccccc" * 100
        value_d = "ddddd" * 100

        # Perform several updates.
        self.large_updates(uri, value_a, ds, nrows, self.prepare, 20)
        self.large_updates(uri, value_b, ds, nrows, self.prepare, 30)
        self.large_updates(uri, value_c, ds, nrows, self.prepare, 40)
        self.large_updates(uri, value_d, ds, nrows, self.prepare, 50)

        # Verify data is visible and correct.
        self.check(value_a, uri, nrows, 20)
        self.check(value_b, uri, nrows, 30)
        self.check(value_c, uri, nrows, 40)
        self.check(value_d, uri, nrows, 50)

        # Checkpoint to ensure the data is flushed, then rollback to the stable timestamp.
        if not self.in_memory:
            self.session.checkpoint()
        self.conn.rollback_to_stable()

        # Check that all keys are removed.
        self.check(value_a, uri, 0, 20)
        self.check(value_b, uri, 0, 30)
        self.check(value_c, uri, 0, 40)
        self.check(value_d, uri, 0, 50)

        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]
        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, 1)
        self.assertEqual(keys_restored, 0)
        self.assertGreater(pages_visited, 0)
        self.assertGreaterEqual(keys_removed, 0)
        if self.in_memory:
            self.assertEqual(upd_aborted, nrows * 4)
            self.assertEqual(hs_removed, 0)
        else:
            self.assertGreaterEqual(upd_aborted + hs_removed + keys_removed, nrows * 4)

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