from sqlalchemy import ForeignKey
from sqlalchemy import Integer
from sqlalchemy import select
from sqlalchemy import String
from sqlalchemy import testing
from sqlalchemy.orm import mapper
from sqlalchemy.orm import Session
from sqlalchemy.testing import eq_
from sqlalchemy.testing import fixtures
from sqlalchemy.testing.schema import Column
from sqlalchemy.testing.schema import Table


class InheritingSelectablesTest(fixtures.MappedTest):
    @classmethod
    def define_tables(cls, metadata):
        foo = Table(
            "foo",
            metadata,
            Column("a", String(30), primary_key=1),
            Column("b", String(30), nullable=0),
        )

        cls.tables.bar = foo.select(foo.c.b == "bar").alias("bar")
        cls.tables.baz = foo.select(foo.c.b == "baz").alias("baz")

    def test_load(self):
        foo, bar, baz = self.tables.foo, self.tables.bar, self.tables.baz
        # TODO: add persistence test also
        testing.db.execute(foo.insert(), a="not bar", b="baz")
        testing.db.execute(foo.insert(), a="also not bar", b="baz")
        testing.db.execute(foo.insert(), a="i am bar", b="bar")
        testing.db.execute(foo.insert(), a="also bar", b="bar")

        class Foo(fixtures.ComparableEntity):
            pass

        class Bar(Foo):
            pass

        class Baz(Foo):
            pass

        mapper(Foo, foo, polymorphic_on=foo.c.b)

        mapper(
            Baz,
            baz,
            with_polymorphic=(
                "*",
                foo.join(baz, foo.c.b == "baz").select().subquery("baz"),
            ),
            inherits=Foo,
            inherit_condition=(foo.c.a == baz.c.a),
            inherit_foreign_keys=[baz.c.a],
            polymorphic_identity="baz",
        )

        mapper(
            Bar,
            bar,
            with_polymorphic=(
                "*",
                foo.join(bar, foo.c.b == "bar").select().subquery("bar"),
            ),
            inherits=Foo,
            inherit_condition=(foo.c.a == bar.c.a),
            inherit_foreign_keys=[bar.c.a],
            polymorphic_identity="bar",
        )

        s = Session()
        assert [Bar(), Bar()] == s.query(Bar).all()


class JoinFromSelectPersistenceTest(fixtures.MappedTest):
    """test for [ticket:2885]"""

    @classmethod
    def define_tables(cls, metadata):
        Table(
            "base",
            metadata,
            Column(
                "id", Integer, primary_key=True, test_needs_autoincrement=True
            ),
            Column("type", String(50)),
        )
        Table(
            "child",
            metadata,
            # 1. name of column must be different, so that we rely on
            # mapper._table_to_equated to link the two cols
            Column(
                "child_id", Integer, ForeignKey("base.id"), primary_key=True
            ),
            Column("name", String(50)),
        )

    @classmethod
    def setup_classes(cls):
        class Base(cls.Comparable):
            pass

        class Child(Base):
            pass

    def test_map_to_select(self):
        Base, Child = self.classes.Base, self.classes.Child
        base, child = self.tables.base, self.tables.child

        base_select = select(base).alias()
        mapper(
            Base,
            base_select,
            polymorphic_on=base_select.c.type,
            polymorphic_identity="base",
        )
        mapper(Child, child, inherits=Base, polymorphic_identity="child")

        sess = Session()

        # 2. use an id other than "1" here so can't rely on
        # the two inserts having the same id
        c1 = Child(id=12, name="c1")
        sess.add(c1)

        sess.commit()
        sess.close()

        c1 = sess.query(Child).one()
        eq_(c1.name, "c1")
