from sqlalchemy import exc
from sqlalchemy import testing
from sqlalchemy.engine import default
from sqlalchemy.orm import joinedload
from sqlalchemy.orm import mapper
from sqlalchemy.orm import relationship
from sqlalchemy.orm import Session
from sqlalchemy.testing import assert_raises_message
from sqlalchemy.testing import AssertsCompiledSQL
from sqlalchemy.testing import eq_
from test.orm import _fixtures


class ForUpdateTest(_fixtures.FixtureTest):
    @classmethod
    def setup_mappers(cls):
        User, users = cls.classes.User, cls.tables.users
        mapper(User, users)

    def _assert(
        self,
        read=False,
        nowait=False,
        of=None,
        key_share=None,
        assert_q_of=None,
        assert_sel_of=None,
    ):
        User = self.classes.User
        s = Session()
        q = s.query(User).with_for_update(
            read=read, nowait=nowait, of=of, key_share=key_share
        )
        sel = q._compile_context().statement

        assert q._for_update_arg.read is read
        assert sel._for_update_arg.read is read

        assert q._for_update_arg.nowait is nowait
        assert sel._for_update_arg.nowait is nowait

        assert q._for_update_arg.key_share is key_share
        assert sel._for_update_arg.key_share is key_share

        eq_(q._for_update_arg.of, assert_q_of)
        eq_(sel._for_update_arg.of, assert_sel_of)

    def test_key_share(self):
        self._assert(key_share=True)

    def test_read(self):
        self._assert(read=True)

    def test_plain(self):
        self._assert()

    def test_nowait(self):
        self._assert(nowait=True)

    def test_of_single_col(self):
        User, users = self.classes.User, self.tables.users
        self._assert(
            of=User.id, assert_q_of=[users.c.id], assert_sel_of=[users.c.id]
        )


class BackendTest(_fixtures.FixtureTest):
    __backend__ = True

    # test against the major backends.   We are naming specific databases
    # here rather than using requirements rules since the behavior of
    # "FOR UPDATE" as well as "OF" is very specific to each DB, and we need
    # to run the query differently based on backend.

    @classmethod
    def setup_mappers(cls):
        User, users = cls.classes.User, cls.tables.users
        Address, addresses = cls.classes.Address, cls.tables.addresses
        mapper(User, users, properties={"addresses": relationship(Address)})
        mapper(Address, addresses)

    def test_inner_joinedload_w_limit(self):
        User = self.classes.User
        sess = Session()
        q = (
            sess.query(User)
            .options(joinedload(User.addresses, innerjoin=True))
            .with_for_update()
            .limit(1)
        )

        if testing.against("oracle"):
            assert_raises_message(exc.DatabaseError, "ORA-02014", q.all)
        else:
            q.all()
        sess.close()

    def test_inner_joinedload_wo_limit(self):
        User = self.classes.User
        sess = Session()
        sess.query(User).options(
            joinedload(User.addresses, innerjoin=True)
        ).with_for_update().all()
        sess.close()

    def test_outer_joinedload_w_limit(self):
        User = self.classes.User
        sess = Session()
        q = sess.query(User).options(
            joinedload(User.addresses, innerjoin=False)
        )

        if testing.against("postgresql"):
            q = q.with_for_update(of=User)
        else:
            q = q.with_for_update()

        q = q.limit(1)

        if testing.against("oracle"):
            assert_raises_message(exc.DatabaseError, "ORA-02014", q.all)
        else:
            q.all()
        sess.close()

    def test_outer_joinedload_wo_limit(self):
        User = self.classes.User
        sess = Session()
        q = sess.query(User).options(
            joinedload(User.addresses, innerjoin=False)
        )

        if testing.against("postgresql"):
            q = q.with_for_update(of=User)
        else:
            q = q.with_for_update()

        q.all()
        sess.close()

    def test_join_w_subquery(self):
        User = self.classes.User
        Address = self.classes.Address
        sess = Session()
        q1 = sess.query(User).with_for_update().subquery()
        sess.query(q1).join(Address).all()
        sess.close()

    def test_plain(self):
        User = self.classes.User
        sess = Session()
        sess.query(User).with_for_update().all()
        sess.close()


class CompileTest(_fixtures.FixtureTest, AssertsCompiledSQL):
    """run some compile tests, even though these are redundant."""

    run_inserts = None

    @classmethod
    def setup_mappers(cls):
        User, users = cls.classes.User, cls.tables.users
        Address, addresses = cls.classes.Address, cls.tables.addresses
        mapper(User, users, properties={"addresses": relationship(Address)})
        mapper(Address, addresses)

    def test_default_update(self):
        User = self.classes.User
        sess = Session()
        self.assert_compile(
            sess.query(User.id).with_for_update(),
            "SELECT users.id AS users_id FROM users FOR UPDATE",
            dialect=default.DefaultDialect(),
        )

    def test_not_supported_by_dialect_should_just_use_update(self):
        User = self.classes.User
        sess = Session()
        self.assert_compile(
            sess.query(User.id).with_for_update(read=True),
            "SELECT users.id AS users_id FROM users FOR UPDATE",
            dialect=default.DefaultDialect(),
        )

    def test_postgres_read(self):
        User = self.classes.User
        sess = Session()
        self.assert_compile(
            sess.query(User.id).with_for_update(read=True),
            "SELECT users.id AS users_id FROM users FOR SHARE",
            dialect="postgresql",
        )

    def test_postgres_read_nowait(self):
        User = self.classes.User
        sess = Session()
        self.assert_compile(
            sess.query(User.id).with_for_update(read=True, nowait=True),
            "SELECT users.id AS users_id FROM users FOR SHARE NOWAIT",
            dialect="postgresql",
        )

    def test_postgres_update(self):
        User = self.classes.User
        sess = Session()
        self.assert_compile(
            sess.query(User.id).with_for_update(),
            "SELECT users.id AS users_id FROM users FOR UPDATE",
            dialect="postgresql",
        )

    def test_postgres_update_of(self):
        User = self.classes.User
        sess = Session()
        self.assert_compile(
            sess.query(User.id).with_for_update(of=User.id),
            "SELECT users.id AS users_id FROM users FOR UPDATE OF users",
            dialect="postgresql",
        )

    def test_postgres_update_of_entity(self):
        User = self.classes.User
        sess = Session()
        self.assert_compile(
            sess.query(User.id).with_for_update(of=User),
            "SELECT users.id AS users_id FROM users FOR UPDATE OF users",
            dialect="postgresql",
        )

    def test_postgres_update_of_entity_list(self):
        User = self.classes.User
        Address = self.classes.Address

        sess = Session()
        self.assert_compile(
            sess.query(User.id, Address.id).with_for_update(
                of=[User, Address]
            ),
            "SELECT users.id AS users_id, addresses.id AS addresses_id "
            "FROM users, addresses FOR UPDATE OF users, addresses",
            dialect="postgresql",
        )

    def test_postgres_for_no_key_update(self):
        User = self.classes.User
        sess = Session()
        self.assert_compile(
            sess.query(User.id).with_for_update(key_share=True),
            "SELECT users.id AS users_id FROM users FOR NO KEY UPDATE",
            dialect="postgresql",
        )

    def test_postgres_for_no_key_nowait_update(self):
        User = self.classes.User
        sess = Session()
        self.assert_compile(
            sess.query(User.id).with_for_update(key_share=True, nowait=True),
            "SELECT users.id AS users_id FROM users FOR NO KEY UPDATE NOWAIT",
            dialect="postgresql",
        )

    def test_postgres_update_of_list(self):
        User = self.classes.User
        sess = Session()
        self.assert_compile(
            sess.query(User.id).with_for_update(
                of=[User.id, User.id, User.id]
            ),
            "SELECT users.id AS users_id FROM users FOR UPDATE OF users",
            dialect="postgresql",
        )

    def test_postgres_update_skip_locked(self):
        User = self.classes.User
        sess = Session()
        self.assert_compile(
            sess.query(User.id).with_for_update(skip_locked=True),
            "SELECT users.id AS users_id FROM users FOR UPDATE SKIP LOCKED",
            dialect="postgresql",
        )

    def test_oracle_update(self):
        User = self.classes.User
        sess = Session()
        self.assert_compile(
            sess.query(User.id).with_for_update(),
            "SELECT users.id AS users_id FROM users FOR UPDATE",
            dialect="oracle",
        )

    def test_oracle_update_skip_locked(self):
        User = self.classes.User
        sess = Session()
        self.assert_compile(
            sess.query(User.id).with_for_update(skip_locked=True),
            "SELECT users.id AS users_id FROM users FOR UPDATE SKIP LOCKED",
            dialect="oracle",
        )

    def test_mysql_read(self):
        User = self.classes.User
        sess = Session()
        self.assert_compile(
            sess.query(User.id).with_for_update(read=True),
            "SELECT users.id AS users_id FROM users LOCK IN SHARE MODE",
            dialect="mysql",
        )

    def test_for_update_on_inner_w_joinedload(self):
        User = self.classes.User
        sess = Session()
        self.assert_compile(
            sess.query(User)
            .options(joinedload(User.addresses))
            .with_for_update()
            .limit(1),
            "SELECT anon_1.users_id AS anon_1_users_id, anon_1.users_name "
            "AS anon_1_users_name, addresses_1.id AS addresses_1_id, "
            "addresses_1.user_id AS addresses_1_user_id, "
            "addresses_1.email_address AS addresses_1_email_address "
            "FROM (SELECT users.id AS users_id, users.name AS users_name "
            "FROM users  LIMIT %s FOR UPDATE) AS anon_1 "
            "LEFT OUTER JOIN addresses AS addresses_1 "
            "ON anon_1.users_id = addresses_1.user_id FOR UPDATE",
            dialect="mysql",
        )

    def test_for_update_on_inner_w_joinedload_no_render_oracle(self):
        User = self.classes.User
        sess = Session()
        self.assert_compile(
            sess.query(User)
            .options(joinedload(User.addresses))
            .with_for_update()
            .limit(1),
            "SELECT anon_1.users_id AS anon_1_users_id, "
            "anon_1.users_name AS anon_1_users_name, "
            "addresses_1.id AS addresses_1_id, "
            "addresses_1.user_id AS addresses_1_user_id, "
            "addresses_1.email_address AS addresses_1_email_address "
            "FROM (SELECT anon_2.users_id AS users_id, "
            "anon_2.users_name AS users_name FROM "
            "(SELECT users.id AS users_id, users.name AS users_name "
            "FROM users) anon_2 WHERE ROWNUM <= [POSTCOMPILE_param_1]) anon_1 "
            "LEFT OUTER JOIN addresses addresses_1 "
            "ON anon_1.users_id = addresses_1.user_id FOR UPDATE",
            dialect="oracle",
        )
