import unittest
import logging

from infi.clickhouse_orm import *


class DictionaryTestMixin:

    def setUp(self):
        self.database = Database('test-db', log_statements=True)
        if self.database.server_version < (20, 1, 11, 73):
            raise unittest.SkipTest('ClickHouse version too old')
        self._create_dictionary()

    def tearDown(self):
        self.database.drop_database()

    def _test_func(self, func, expected_value):
        sql = 'SELECT %s AS value' % func.to_sql()
        logging.info(sql)
        result = list(self.database.select(sql))
        logging.info('\t==> %s', result[0].value if result else '<empty>')
        print('Comparing %s to %s' % (result[0].value, expected_value))
        self.assertEqual(result[0].value, expected_value)
        return result[0].value if result else None


class SimpleDictionaryTest(DictionaryTestMixin, unittest.TestCase):

    def _create_dictionary(self):
        # Create a table to be used as source for the dictionary
        self.database.create_table(NumberName)
        self.database.insert(
            NumberName(number=i, name=name)
            for i, name in enumerate('Zero One Two Three Four Five Six Seven Eight Nine Ten'.split())
        )
        # Create the dictionary
        self.database.raw("""
            CREATE DICTIONARY numbers_dict(
              number UInt64,
              name String DEFAULT '?'
            )
            PRIMARY KEY number
            SOURCE(CLICKHOUSE(
                HOST 'localhost' PORT 9000 USER 'default' PASSWORD '' DB 'test-db' TABLE 'numbername'
            ))
            LIFETIME(100)
            LAYOUT(HASHED());
        """)
        self.dict_name = 'test-db.numbers_dict'

    def test_dictget(self):
        self._test_func(F.dictGet(self.dict_name, 'name', F.toUInt64(3)), 'Three')
        self._test_func(F.dictGet(self.dict_name, 'name', F.toUInt64(99)), '?')

    def test_dictgetordefault(self):
        self._test_func(F.dictGetOrDefault(self.dict_name, 'name', F.toUInt64(3), 'n/a'), 'Three')
        self._test_func(F.dictGetOrDefault(self.dict_name, 'name', F.toUInt64(99), 'n/a'), 'n/a')

    def test_dicthas(self):
        self._test_func(F.dictHas(self.dict_name, F.toUInt64(3)), 1)
        self._test_func(F.dictHas(self.dict_name, F.toUInt64(99)), 0)


class HierarchicalDictionaryTest(DictionaryTestMixin, unittest.TestCase):

    def _create_dictionary(self):
        # Create a table to be used as source for the dictionary
        self.database.create_table(Region)
        self.database.insert([
            Region(region_id=1, parent_region=0, region_name='Russia'),
            Region(region_id=2, parent_region=1, region_name='Moscow'),
            Region(region_id=3, parent_region=2, region_name='Center'),
            Region(region_id=4, parent_region=0, region_name='Great Britain'),
            Region(region_id=5, parent_region=4, region_name='London'),
        ])
        # Create the dictionary
        self.database.raw("""
            CREATE DICTIONARY regions_dict(
              region_id UInt64,
              parent_region UInt64 HIERARCHICAL,
              region_name String DEFAULT '?'
            )
            PRIMARY KEY region_id
            SOURCE(CLICKHOUSE(
                HOST 'localhost' PORT 9000 USER 'default' PASSWORD '' DB 'test-db' TABLE 'region'
            ))
            LIFETIME(100)
            LAYOUT(HASHED());
        """)
        self.dict_name = 'test-db.regions_dict'

    def test_dictget(self):
        self._test_func(F.dictGet(self.dict_name, 'region_name', F.toUInt64(3)), 'Center')
        self._test_func(F.dictGet(self.dict_name, 'parent_region', F.toUInt64(3)), 2)
        self._test_func(F.dictGet(self.dict_name, 'region_name', F.toUInt64(99)), '?')

    def test_dictgetordefault(self):
        self._test_func(F.dictGetOrDefault(self.dict_name, 'region_name', F.toUInt64(3), 'n/a'), 'Center')
        self._test_func(F.dictGetOrDefault(self.dict_name, 'region_name', F.toUInt64(99), 'n/a'), 'n/a')

    def test_dicthas(self):
        self._test_func(F.dictHas(self.dict_name, F.toUInt64(3)), 1)
        self._test_func(F.dictHas(self.dict_name, F.toUInt64(99)), 0)

    def test_dictgethierarchy(self):
        self._test_func(F.dictGetHierarchy(self.dict_name, F.toUInt64(3)), [3, 2, 1])
        self._test_func(F.dictGetHierarchy(self.dict_name, F.toUInt64(99)), [])

    def test_dictisin(self):
        self._test_func(F.dictIsIn(self.dict_name, F.toUInt64(3), F.toUInt64(1)), 1)
        self._test_func(F.dictIsIn(self.dict_name, F.toUInt64(3), F.toUInt64(4)), 0)
        self._test_func(F.dictIsIn(self.dict_name, F.toUInt64(99), F.toUInt64(4)), 0)


class NumberName(Model):
    ''' A table to act as a source for the dictionary '''

    number = UInt64Field()
    name = StringField()

    engine = Memory()


class Region(Model):

    region_id = UInt64Field()
    parent_region = UInt64Field()
    region_name = StringField()

    engine = Memory()