from .. import fixtures, config
from ..config import requirements
from ..assertions import eq_
from ... import testing

from ... import Integer, String, Sequence, schema, MetaData

from ..schema import Table, Column


class SequenceTest(fixtures.TablesTest):
    __requires__ = ('sequences',)
    __backend__ = True

    run_create_tables = 'each'

    @classmethod
    def define_tables(cls, metadata):
        Table('seq_pk', metadata,
              Column('id', Integer, Sequence('tab_id_seq'), primary_key=True),
              Column('data', String(50))
              )

        Table('seq_opt_pk', metadata,
              Column('id', Integer, Sequence('tab_id_seq', optional=True),
                     primary_key=True),
              Column('data', String(50))
              )

    def test_insert_roundtrip(self):
        config.db.execute(
            self.tables.seq_pk.insert(),
            data="some data"
        )
        self._assert_round_trip(self.tables.seq_pk, config.db)

    def test_insert_lastrowid(self):
        r = config.db.execute(
            self.tables.seq_pk.insert(),
            data="some data"
        )
        eq_(
            r.inserted_primary_key,
            [1]
        )

    def test_nextval_direct(self):
        r = config.db.execute(
            self.tables.seq_pk.c.id.default
        )
        eq_(
            r, 1
        )

    @requirements.sequences_optional
    def test_optional_seq(self):
        r = config.db.execute(
            self.tables.seq_opt_pk.insert(),
            data="some data"
        )
        eq_(
            r.inserted_primary_key,
            [1]
        )

    def _assert_round_trip(self, table, conn):
        row = conn.execute(table.select()).first()
        eq_(
            row,
            (1, "some data")
        )


class SequenceCompilerTest(testing.AssertsCompiledSQL, fixtures.TestBase):
    __requires__ = ('sequences',)
    __backend__ = True

    def test_literal_binds_inline_compile(self):
        table = Table(
            'x', MetaData(),
            Column('y', Integer, Sequence('y_seq')),
            Column('q', Integer))

        stmt = table.insert().values(q=5)

        seq_nextval = testing.db.dialect.statement_compiler(
            statement=None, dialect=testing.db.dialect).visit_sequence(
            Sequence("y_seq"))
        self.assert_compile(
            stmt,
            "INSERT INTO x (y, q) VALUES (%s, 5)" % (seq_nextval, ),
            literal_binds=True,
            dialect=testing.db.dialect)


class HasSequenceTest(fixtures.TestBase):
    __requires__ = 'sequences',
    __backend__ = True

    def test_has_sequence(self):
        s1 = Sequence('user_id_seq')
        testing.db.execute(schema.CreateSequence(s1))
        try:
            eq_(testing.db.dialect.has_sequence(testing.db,
                                                'user_id_seq'), True)
        finally:
            testing.db.execute(schema.DropSequence(s1))

    @testing.requires.schemas
    def test_has_sequence_schema(self):
        s1 = Sequence('user_id_seq', schema=config.test_schema)
        testing.db.execute(schema.CreateSequence(s1))
        try:
            eq_(testing.db.dialect.has_sequence(
                testing.db, 'user_id_seq', schema=config.test_schema), True)
        finally:
            testing.db.execute(schema.DropSequence(s1))

    def test_has_sequence_neg(self):
        eq_(testing.db.dialect.has_sequence(testing.db, 'user_id_seq'),
            False)

    @testing.requires.schemas
    def test_has_sequence_schemas_neg(self):
        eq_(testing.db.dialect.has_sequence(testing.db, 'user_id_seq',
                                            schema=config.test_schema),
            False)

    @testing.requires.schemas
    def test_has_sequence_default_not_in_remote(self):
        s1 = Sequence('user_id_seq')
        testing.db.execute(schema.CreateSequence(s1))
        try:
            eq_(testing.db.dialect.has_sequence(testing.db, 'user_id_seq',
                                                schema=config.test_schema),
                False)
        finally:
            testing.db.execute(schema.DropSequence(s1))

    @testing.requires.schemas
    def test_has_sequence_remote_not_in_default(self):
        s1 = Sequence('user_id_seq', schema=config.test_schema)
        testing.db.execute(schema.CreateSequence(s1))
        try:
            eq_(testing.db.dialect.has_sequence(testing.db, 'user_id_seq'),
                False)
        finally:
            testing.db.execute(schema.DropSequence(s1))