#!/usr/bin/env python
#
# Public Domain 2014-present MongoDB, Inc.
# Public Domain 2008-2014 WiredTiger, Inc.
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from test_gc01 import test_gc_base
from wiredtiger import stat
from wtdataset import SimpleDataSet

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

# test_gc04.py
# Test that checkpoint must not clean the pages that are not obsolete.
class test_gc04(test_gc_base):
    conn_config = 'cache_size=50MB,log=(enabled),statistics=(all)'
    session_config = 'isolation=snapshot'

    def get_stat(self, stat):
        stat_cursor = self.session.open_cursor('statistics:')
        val = stat_cursor[stat][2]
        stat_cursor.close()
        return val

    def test_gc(self):
        nrows = 10000

        # Create a table without logging.
        uri = "table:gc04"
        ds = SimpleDataSet(
            self, uri, 0, key_format="i", value_format="S", config='log=(enabled=false)')
        ds.populate()

        # Pin oldest and stable to timestamp 1.
        self.conn.set_timestamp('oldest_timestamp=' + timestamp_str(1) +
            ',stable_timestamp=' + timestamp_str(1))

        bigvalue = "aaaaa" * 100
        bigvalue2 = "ddddd" * 100
        self.large_updates(uri, bigvalue, ds, nrows, 10)
        self.large_updates(uri, bigvalue2, ds, nrows, 20)

        # Checkpoint to ensure that the history store is populated.
        self.session.checkpoint()
        self.assertEqual(self.get_stat(stat.conn.cc_pages_evict), 0)
        self.assertEqual(self.get_stat(stat.conn.cc_pages_removed), 0)
        self.assertGreater(self.get_stat(stat.conn.cc_pages_visited), 0)

        self.large_updates(uri, bigvalue, ds, nrows, 30)

        # Checkpoint to ensure that the history store is populated.
        self.session.checkpoint()
        self.assertEqual(self.get_stat(stat.conn.cc_pages_evict), 0)
        self.assertEqual(self.get_stat(stat.conn.cc_pages_removed), 0)
        self.assertGreater(self.get_stat(stat.conn.cc_pages_visited), 0)

        self.large_updates(uri, bigvalue2, ds, nrows, 40)

        # Checkpoint to ensure that the history store is populated.
        self.session.checkpoint()
        self.assertEqual(self.get_stat(stat.conn.cc_pages_evict), 0)
        self.assertEqual(self.get_stat(stat.conn.cc_pages_removed), 0)
        self.assertGreater(self.get_stat(stat.conn.cc_pages_visited), 0)

        self.large_updates(uri, bigvalue, ds, nrows, 50)
        self.large_updates(uri, bigvalue2, ds, nrows, 60)

        # Checkpoint to ensure that the history store is populated.
        self.session.checkpoint()
        self.assertEqual(self.get_stat(stat.conn.cc_pages_evict), 0)
        self.assertEqual(self.get_stat(stat.conn.cc_pages_removed), 0)
        self.assertGreater(self.get_stat(stat.conn.cc_pages_visited), 0)

        self.large_updates(uri, bigvalue, ds, nrows, 70)

        # Checkpoint to ensure that the history store is populated.
        self.session.checkpoint()
        self.assertEqual(self.get_stat(stat.conn.cc_pages_evict), 0)
        self.assertEqual(self.get_stat(stat.conn.cc_pages_removed), 0)
        self.assertGreater(self.get_stat(stat.conn.cc_pages_visited), 0)

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