# coding: utf-8

from sqlalchemy.testing.assertions import eq_, assert_raises
from sqlalchemy.testing import fixtures
from sqlalchemy import testing
from sqlalchemy import Table, Column, Integer, String
from sqlalchemy import exc, schema
from sqlalchemy.dialects.postgresql import insert


class OnConflictTest(fixtures.TablesTest):

    __only_on__ = 'postgresql >= 9.5',
    __backend__ = True

    @classmethod
    def define_tables(cls, metadata):
        Table(
            'users', metadata,
            Column('id', Integer, primary_key=True),
            Column('name', String(50))
        )

        users_xtra = Table(
            'users_xtra', metadata,
            Column('id', Integer, primary_key=True),
            Column('name', String(50)),
            Column('login_email', String(50)),
            Column('lets_index_this', String(50))
        )
        cls.unique_constraint = schema.UniqueConstraint(
            users_xtra.c.login_email, name='uq_login_email')
        cls.bogus_index = schema.Index(
            'idx_special_ops',
            users_xtra.c.lets_index_this,
            postgresql_where=users_xtra.c.lets_index_this > 'm')

    def test_bad_args(self):
        assert_raises(
            ValueError,
            insert(self.tables.users).on_conflict_do_nothing,
            constraint='id', index_elements=['id']
        )
        assert_raises(
            ValueError,
            insert(self.tables.users).on_conflict_do_update,
            constraint='id', index_elements=['id']
        )
        assert_raises(
            ValueError,
            insert(self.tables.users).on_conflict_do_update, constraint='id'
        )
        assert_raises(
            ValueError,
            insert(self.tables.users).on_conflict_do_update
        )

    def test_on_conflict_do_nothing(self):
        users = self.tables.users

        with testing.db.connect() as conn:
            result = conn.execute(
                insert(users).on_conflict_do_nothing(),
                dict(id=1, name='name1')
            )
            eq_(result.inserted_primary_key, [1])
            eq_(result.returned_defaults, None)

            result = conn.execute(
                insert(users).on_conflict_do_nothing(),
                dict(id=1, name='name2')
            )
            eq_(result.inserted_primary_key, [1])
            eq_(result.returned_defaults, None)

            eq_(
                conn.execute(users.select().where(users.c.id == 1)).fetchall(),
                [(1, 'name1')]
            )

    @testing.provide_metadata
    def test_on_conflict_do_nothing_target(self):
        users = self.tables.users

        with testing.db.connect() as conn:
            result = conn.execute(
                insert(users)
                .on_conflict_do_nothing(
                    index_elements=users.primary_key.columns),
                dict(id=1, name='name1')
            )
            eq_(result.inserted_primary_key, [1])
            eq_(result.returned_defaults, None)

            result = conn.execute(
                insert(users)
                .on_conflict_do_nothing(
                    index_elements=users.primary_key.columns),
                dict(id=1, name='name2')
            )
            eq_(result.inserted_primary_key, [1])
            eq_(result.returned_defaults, None)

            eq_(
                conn.execute(users.select().where(users.c.id == 1)).fetchall(),
                [(1, 'name1')]
            )

    def test_on_conflict_do_update_one(self):
        users = self.tables.users

        with testing.db.connect() as conn:
            conn.execute(users.insert(), dict(id=1, name='name1'))

            i = insert(users)
            i = i.on_conflict_do_update(
                index_elements=[users.c.id],
                set_=dict(name=i.excluded.name))
            result = conn.execute(i, dict(id=1, name='name1'))

            eq_(result.inserted_primary_key, [1])
            eq_(result.returned_defaults, None)

            eq_(
                conn.execute(users.select().where(users.c.id == 1)).fetchall(),
                [(1, 'name1')]
            )

    def test_on_conflict_do_update_two(self):
        users = self.tables.users

        with testing.db.connect() as conn:
            conn.execute(users.insert(), dict(id=1, name='name1'))

            i = insert(users)
            i = i.on_conflict_do_update(
                index_elements=[users.c.id],
                set_=dict(id=i.excluded.id, name=i.excluded.name)
            )

            result = conn.execute(i, dict(id=1, name='name2'))
            eq_(result.inserted_primary_key, [1])
            eq_(result.returned_defaults, None)

            eq_(
                conn.execute(users.select().where(users.c.id == 1)).fetchall(),
                [(1, 'name2')]
            )

    def test_on_conflict_do_update_three(self):
        users = self.tables.users

        with testing.db.connect() as conn:
            conn.execute(users.insert(), dict(id=1, name='name1'))

            i = insert(users)
            i = i.on_conflict_do_update(
                index_elements=users.primary_key.columns,
                set_=dict(name=i.excluded.name)
            )
            result = conn.execute(i, dict(id=1, name='name3'))
            eq_(result.inserted_primary_key, [1])
            eq_(result.returned_defaults, None)

            eq_(
                conn.execute(users.select().where(users.c.id == 1)).fetchall(),
                [(1, 'name3')]
            )

    def test_on_conflict_do_update_four(self):
        users = self.tables.users

        with testing.db.connect() as conn:
            conn.execute(users.insert(), dict(id=1, name='name1'))

            i = insert(users)
            i = i.on_conflict_do_update(
                index_elements=users.primary_key.columns,
                set_=dict(id=i.excluded.id, name=i.excluded.name)
            ).values(id=1, name='name4')

            result = conn.execute(i)
            eq_(result.inserted_primary_key, [1])
            eq_(result.returned_defaults, None)

            eq_(
                conn.execute(users.select().where(users.c.id == 1)).fetchall(),
                [(1, 'name4')]
            )

    def test_on_conflict_do_update_five(self):
        users = self.tables.users

        with testing.db.connect() as conn:
            conn.execute(users.insert(), dict(id=1, name='name1'))

            i = insert(users)
            i = i.on_conflict_do_update(
                index_elements=users.primary_key.columns,
                set_=dict(id=10, name="I'm a name")
            ).values(id=1, name='name4')

            result = conn.execute(i)
            eq_(result.inserted_primary_key, [1])
            eq_(result.returned_defaults, None)

            eq_(
                conn.execute(
                    users.select().where(users.c.id == 10)).fetchall(),
                [(10, "I'm a name")]
            )

    def test_on_conflict_do_update_multivalues(self):
        users = self.tables.users

        with testing.db.connect() as conn:
            conn.execute(users.insert(), dict(id=1, name='name1'))
            conn.execute(users.insert(), dict(id=2, name='name2'))

            i = insert(users)
            i = i.on_conflict_do_update(
                index_elements=users.primary_key.columns,
                set_=dict(name="updated"),
                where=(i.excluded.name != 'name12')
            ).values([
                dict(id=1, name='name11'),
                dict(id=2, name='name12'),
                dict(id=3, name='name13'),
                dict(id=4, name='name14'),
            ])

            result = conn.execute(i)
            eq_(result.inserted_primary_key, [None])
            eq_(result.returned_defaults, None)

            eq_(
                conn.execute(
                    users.select().order_by(users.c.id)).fetchall(),
                [
                    (1, "updated"),
                    (2, "name2"),
                    (3, "name13"),
                    (4, "name14")
                ]
            )

    def _exotic_targets_fixture(self, conn):
        users = self.tables.users_xtra

        conn.execute(
            insert(users),
            dict(
                id=1, name='name1',
                login_email='name1@gmail.com', lets_index_this='not'
            )
        )
        conn.execute(
            users.insert(),
            dict(
                id=2, name='name2',
                login_email='name2@gmail.com', lets_index_this='not'
            )
        )

        eq_(
            conn.execute(users.select().where(users.c.id == 1)).fetchall(),
            [(1, 'name1', 'name1@gmail.com', 'not')]
        )

    def test_on_conflict_do_update_exotic_targets_two(self):
        users = self.tables.users_xtra

        with testing.db.connect() as conn:
            self._exotic_targets_fixture(conn)
            # try primary key constraint: cause an upsert on unique id column
            i = insert(users)
            i = i.on_conflict_do_update(
                index_elements=users.primary_key.columns,
                set_=dict(
                    name=i.excluded.name,
                    login_email=i.excluded.login_email)
            )
            result = conn.execute(i, dict(
                id=1, name='name2', login_email='name1@gmail.com',
                lets_index_this='not')
            )
            eq_(result.inserted_primary_key, [1])
            eq_(result.returned_defaults, None)

            eq_(
                conn.execute(users.select().where(users.c.id == 1)).fetchall(),
                [(1, 'name2', 'name1@gmail.com', 'not')]
            )

    def test_on_conflict_do_update_exotic_targets_three(self):
        users = self.tables.users_xtra

        with testing.db.connect() as conn:
            self._exotic_targets_fixture(conn)
            # try unique constraint: cause an upsert on target
            # login_email, not id
            i = insert(users)
            i = i.on_conflict_do_update(
                constraint=self.unique_constraint,
                set_=dict(id=i.excluded.id, name=i.excluded.name,
                          login_email=i.excluded.login_email)
            )
            # note: lets_index_this value totally ignored in SET clause.
            result = conn.execute(i, dict(
                id=42, name='nameunique',
                login_email='name2@gmail.com', lets_index_this='unique')
            )
            eq_(result.inserted_primary_key, [42])
            eq_(result.returned_defaults, None)

            eq_(
                conn.execute(
                    users.select().
                    where(users.c.login_email == 'name2@gmail.com')
                ).fetchall(),
                [(42, 'nameunique', 'name2@gmail.com', 'not')]
            )

    def test_on_conflict_do_update_exotic_targets_four(self):
        users = self.tables.users_xtra

        with testing.db.connect() as conn:
            self._exotic_targets_fixture(conn)
            # try unique constraint by name: cause an
            # upsert on target login_email, not id
            i = insert(users)
            i = i.on_conflict_do_update(
                constraint=self.unique_constraint.name,
                set_=dict(
                    id=i.excluded.id, name=i.excluded.name,
                    login_email=i.excluded.login_email)
            )
            # note: lets_index_this value totally ignored in SET clause.

            result = conn.execute(i, dict(
                id=43, name='nameunique2',
                login_email='name2@gmail.com', lets_index_this='unique')
            )
            eq_(result.inserted_primary_key, [43])
            eq_(result.returned_defaults, None)

            eq_(
                conn.execute(
                    users.select().
                    where(users.c.login_email == 'name2@gmail.com')
                ).fetchall(),
                [(43, 'nameunique2', 'name2@gmail.com', 'not')]
            )

    def test_on_conflict_do_update_exotic_targets_four_no_pk(self):
        users = self.tables.users_xtra

        with testing.db.connect() as conn:
            self._exotic_targets_fixture(conn)
            # try unique constraint by name: cause an
            # upsert on target login_email, not id
            i = insert(users)
            i = i.on_conflict_do_update(
                index_elements=[users.c.login_email],
                set_=dict(
                    id=i.excluded.id, name=i.excluded.name,
                    login_email=i.excluded.login_email)
            )

            result = conn.execute(i, dict(
                name='name3',
                login_email='name1@gmail.com')
            )
            eq_(result.inserted_primary_key, [1])
            eq_(result.returned_defaults, (1, ))

            eq_(
                conn.execute(users.select().order_by(users.c.id)).fetchall(),
                [
                    (1, 'name3', 'name1@gmail.com', 'not'),
                    (2, 'name2', 'name2@gmail.com', 'not')
                ]
            )

    def test_on_conflict_do_update_exotic_targets_five(self):
        users = self.tables.users_xtra

        with testing.db.connect() as conn:
            self._exotic_targets_fixture(conn)
            # try bogus index
            i = insert(users)
            i = i.on_conflict_do_update(
                index_elements=self.bogus_index.columns,
                index_where=self.
                bogus_index.dialect_options['postgresql']['where'],
                set_=dict(
                    name=i.excluded.name,
                    login_email=i.excluded.login_email)
            )

            assert_raises(
                exc.ProgrammingError, conn.execute, i,
                dict(
                    id=1, name='namebogus', login_email='bogus@gmail.com',
                    lets_index_this='bogus')
            )

    def test_on_conflict_do_update_no_row_actually_affected(self):
        users = self.tables.users_xtra

        with testing.db.connect() as conn:
            self._exotic_targets_fixture(conn)
            i = insert(users)
            i = i.on_conflict_do_update(
                index_elements=[users.c.login_email],
                set_=dict(name='new_name'),
                where=(i.excluded.name == 'other_name')
            )
            result = conn.execute(
                i, dict(name='name2', login_email='name1@gmail.com'))

            eq_(result.returned_defaults, None)
            eq_(result.inserted_primary_key, None)

            eq_(
                conn.execute(users.select()).fetchall(),
                [
                    (1, 'name1', 'name1@gmail.com', 'not'),
                    (2, 'name2', 'name2@gmail.com', 'not')
                ]
            )
