#!/usr/bin/env python
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# Public Domain 2014-present MongoDB, Inc.
# Public Domain 2008-2014 WiredTiger, Inc.
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import os
import wiredtiger, wttest, run
from wtscenario import make_scenarios

# test_schema05.py
#    Test indices using a custom extractor.
class test_schema05(wttest.WiredTigerTestCase):
    """
    Test indices with a custom extractor.
    This test is the same as test_schema04, except that rows
    are comma separated values (CSV) and we use a custom
    extractor to pull out the index keys.
    Our set of rows looks like a multiplication table:
      row '0':  '0,0,0,0,0,0'
      row '1':  '0,1,2,3,4,5'
      row '2':  '0,2,4,6,8,10'
    with the twist that entries are mod 100.  So, looking further:
      row '31':  '0,31,62,93,24,55'

    Each column is placed into its own index.  The mod twist,
    as well as the 0th column, guarantees we'll have some duplicates.
    """
    nentries = 1000
    nindices = 6

    scenarios = make_scenarios([
        ('index-before', { 'create_index' : 0 }),
        ('index-during', { 'create_index' : 1 }),
        ('index-after', { 'create_index' : 2 }),
    ])

    def conn_extensions(self, extlist):
        extlist.skip_if_missing = True
        extlist.extension('extractors', 'csv')

    def create_indices(self):
        # Create self.nindices index files, each with a column from the CSV
        for i in range(0, self.nindices):
            si = str(i)
            self.session.create('index:schema05:x' + si,
                                'key_format=S,columns=(key),'
                                'extractor=csv,app_metadata={"format" : "S",' +
                                '"field" : "' + si + '"}')

    def drop_indices(self):
        for i in range(0, self.nindices):
            self.session.drop("index:schema05:x" + str(i))

    def csv(self, s, i):
        return s.split(',')[i]

    # We split the population into two phases
    # (in anticipation of future tests that create
    # indices between the two population steps).
    def populate(self, phase):
        cursor = self.session.open_cursor('table:schema05', None, None)
        if phase == 0:
            range_from = 0
            range_to = self.nentries // 2
        elif phase == 1:
            range_from = self.nentries // 2
            range_to = self.nentries - 5
        else:
            range_from = self.nentries - 5
            range_to = self.nentries

        for i in range(range_from, range_to):
            # e.g. element 31 is '0,31,62,93,24,55'
            cursor[i] = ','.join([str((i*j)%100) for j in
                                  range(0, self.nindices)])
        cursor.close()

    def check_entries(self):
        cursor = self.session.open_cursor('table:schema05', None, None)
        icursor = []
        for i in range(0, self.nindices):
            icursor.append(self.session.open_cursor('index:schema05:x' + str(i),
                                                    None, None))
        i = 0
        for primkey, value in cursor:
            # Check main table
            expect = ','.join([str((i*j)%100) for j in range(0, self.nindices)])
            self.assertEqual(i, primkey)
            self.assertEqual(value, expect)
            for idx in range(0, self.nindices):
                c = icursor[idx]
                indexkey = str((i*idx)%100)
                c.set_key(indexkey)
                self.assertEqual(c.search(), 0)
                value = c.get_value()
                while value != expect and \
                      self.csv(value, idx) == self.csv(expect, idx):
                    c.next()
                    value = c.get_value()
                self.assertEqual(value, expect)
            i += 1
        cursor.close()
        self.assertEqual(self.nentries, i)
        for i in range(0, self.nindices):
            icursor[i].close()

    def test_index(self):
        self.session.create("table:schema05", "key_format=i,value_format=S,"
                            "columns=(primarykey,value)")
        if self.create_index == 0:
            self.create_indices()
        self.populate(0)
        if self.create_index == 1:
            self.create_indices()
        self.populate(1)
        if self.create_index == 2:
            self.create_indices()
        self.populate(2)
        self.check_entries()

        # Drop and recreate all indices, everything should be there.
        self.drop_indices()
        self.create_indices()
        self.check_entries()

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