#!/usr/bin/env python
#
# Public Domain 2014-2016 MongoDB, Inc.
# Public Domain 2008-2014 WiredTiger, Inc.
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import wiredtiger, wttest
from helper import complex_populate, simple_populate, key_populate
from suite_subprocess import suite_subprocess
from wiredtiger import stat
from wtscenario import multiply_scenarios, number_scenarios

# test_compact.py
#    session level compact operation
class test_compact(wttest.WiredTigerTestCase, suite_subprocess):
    name = 'test_compact'

    # Use a small page size because we want to create lots of pages.
    config = 'allocation_size=512,' +\
        'leaf_page_max=512,value_format=S,key_format=S'
    nentries = 50000

    # The table is a complex object, give it roughly 5 pages per underlying
    # file.
    types = [
        ('file', dict(type='file:', pop=simple_populate, maxpages=5)),
        ('table', dict(type='table:', pop=complex_populate, maxpages=50))
        ]
    compact = [
        ('method', dict(utility=0,reopen=0)),
        ('method_reopen', dict(utility=0,reopen=1)),
        ('utility', dict(utility=1,reopen=0)),
    ]
    scenarios = number_scenarios(multiply_scenarios('.', types, compact))
    # We want a large cache so that eviction doesn't happen
    # (which could skew our compaction results).
    conn_config = 'cache_size=250MB,statistics=(all)'

    # Test compaction.
    def test_compact(self):
        # Populate an object
        uri = self.type + self.name
        self.pop(self, uri, self.config, self.nentries - 1)

        # Reopen the connection to force the object to disk.
        self.reopen_conn()

        # Confirm the tree starts big
        stat_cursor = self.session.open_cursor('statistics:' + uri, None, None)
        self.assertGreater(stat_cursor[stat.dsrc.btree_row_leaf][2], self.maxpages)
        stat_cursor.close()

        # Remove most of the object.
        c1 = self.session.open_cursor(uri, None)
        c1.set_key(key_populate(c1, 5))
        c2 = self.session.open_cursor(uri, None)
        c2.set_key(key_populate(c2, self.nentries - 5))
        self.session.truncate(None, c1, c2, None)
        c1.close()
        c2.close()

        # Compact it, using either the session method or the utility.
        if self.utility == 1:
            self.session.checkpoint(None)
            self.close_conn()
            self.runWt(["compact", uri])
        else:
            # Optionally reopen the connection so we do more on-disk tests.
            if self.reopen == 1:
                self.session.checkpoint(None)
                self.reopen_conn()

            self.session.compact(uri, None)

        # Confirm compaction worked: check the number of on-disk pages
        self.reopen_conn()
        stat_cursor = self.session.open_cursor('statistics:' + uri, None, None)
        self.assertLess(stat_cursor[stat.dsrc.btree_row_leaf][2], self.maxpages)
        stat_cursor.close()


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