#!/usr/bin/env python
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# Public Domain 2008-2014 WiredTiger, Inc.
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import fnmatch, os, shutil, time
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

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

# test_rollback_to_stable13.py
# Test the rollback to stable should roll back the tombstone in the history store.
class test_rollback_to_stable13(test_rollback_to_stable_base):
    session_config = 'isolation=snapshot'

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

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

    scenarios = make_scenarios(key_format_values, prepare_values)

    def conn_config(self):
        config = 'cache_size=500MB,statistics=(all),log=(enabled=true)'
        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_stable13"
        ds = SimpleDataSet(
            self, uri, 0, key_format=self.key_format, value_format="S", config='split_pct=50,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

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

        # Perform several removes.
        self.large_removes(uri, ds, nrows, self.prepare, 30)

        # Perform several updates.
        self.large_updates(uri, value_b, ds, nrows, self.prepare, 60)

        # Verify data is visible and correct.
        self.check(value_a, uri, nrows, 20)
        self.check(None, uri, 0, 30)
        self.check(value_b, uri, nrows, 60)

        # Pin stable to timestamp 50 if prepare otherwise 40.
        if self.prepare:
            self.conn.set_timestamp('stable_timestamp=' + timestamp_str(50))
        else:
            self.conn.set_timestamp('stable_timestamp=' + timestamp_str(40))

        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(None, uri, 0, 50)

        # Check that we restore the correct value from the history store.
        self.check(value_a, uri, nrows, 20)

        stat_cursor = self.session.open_cursor('statistics:', None, None)
        restored_tombstones = stat_cursor[stat.conn.txn_rts_hs_restore_tombstones][2]
        self.assertEqual(restored_tombstones, nrows)