from sqlalchemy import bindparam
from sqlalchemy import Column
from sqlalchemy import Integer
from sqlalchemy import MetaData
from sqlalchemy import Sequence
from sqlalchemy import String
from sqlalchemy import Table
from sqlalchemy import testing
from sqlalchemy import text
from sqlalchemy.testing import AssertsExecutionResults
from sqlalchemy.testing import eq_
from sqlalchemy.testing import fixtures


class FoundRowsTest(fixtures.TestBase, AssertsExecutionResults):

    """tests rowcount functionality"""

    __requires__ = ("sane_rowcount",)
    __backend__ = True

    @classmethod
    def setup_class(cls):
        global employees_table, metadata
        metadata = MetaData(testing.db)

        employees_table = Table(
            "employees",
            metadata,
            Column(
                "employee_id",
                Integer,
                Sequence("employee_id_seq", optional=True),
                primary_key=True,
            ),
            Column("name", String(50)),
            Column("department", String(1)),
        )
        metadata.create_all()

    def setup(self):
        global data
        data = [
            ("Angela", "A"),
            ("Andrew", "A"),
            ("Anand", "A"),
            ("Bob", "B"),
            ("Bobette", "B"),
            ("Buffy", "B"),
            ("Charlie", "C"),
            ("Cynthia", "C"),
            ("Chris", "C"),
        ]

        i = employees_table.insert()
        i.execute(*[{"name": n, "department": d} for n, d in data])

    def teardown(self):
        employees_table.delete().execute()

    @classmethod
    def teardown_class(cls):
        metadata.drop_all()

    def test_basic(self):
        s = employees_table.select()
        r = s.execute().fetchall()

        assert len(r) == len(data)

    def test_update_rowcount1(self):
        # WHERE matches 3, 3 rows changed
        department = employees_table.c.department
        r = employees_table.update(department == "C").execute(department="Z")
        assert r.rowcount == 3

    def test_update_rowcount2(self):
        # WHERE matches 3, 0 rows changed
        department = employees_table.c.department
        r = employees_table.update(department == "C").execute(department="C")
        assert r.rowcount == 3

    @testing.skip_if(
        testing.requires.oracle5x, "unknown DBAPI error fixed in later version"
    )
    @testing.requires.sane_rowcount_w_returning
    def test_update_rowcount_return_defaults(self):
        department = employees_table.c.department
        stmt = (
            employees_table.update(department == "C")
            .values(name=employees_table.c.department + "Z")
            .return_defaults()
        )

        r = stmt.execute()
        assert r.rowcount == 3

    def test_raw_sql_rowcount(self):
        # test issue #3622, make sure eager rowcount is called for text
        with testing.db.connect() as conn:
            result = conn.execute(
                "update employees set department='Z' where department='C'"
            )
            eq_(result.rowcount, 3)

    def test_text_rowcount(self):
        # test issue #3622, make sure eager rowcount is called for text
        with testing.db.connect() as conn:
            result = conn.execute(
                text(
                    "update employees set department='Z' "
                    "where department='C'"
                )
            )
            eq_(result.rowcount, 3)

    def test_delete_rowcount(self):
        # WHERE matches 3, 3 rows deleted
        department = employees_table.c.department
        r = employees_table.delete(department == "C").execute()
        assert r.rowcount == 3

    @testing.requires.sane_multi_rowcount
    def test_multi_update_rowcount(self):
        stmt = (
            employees_table.update()
            .where(employees_table.c.name == bindparam("emp_name"))
            .values(department="C")
        )

        r = testing.db.execute(
            stmt,
            [
                {"emp_name": "Bob"},
                {"emp_name": "Cynthia"},
                {"emp_name": "nonexistent"},
            ],
        )

        eq_(r.rowcount, 2)

    @testing.requires.sane_multi_rowcount
    def test_multi_delete_rowcount(self):
        stmt = employees_table.delete().where(
            employees_table.c.name == bindparam("emp_name")
        )

        r = testing.db.execute(
            stmt,
            [
                {"emp_name": "Bob"},
                {"emp_name": "Cynthia"},
                {"emp_name": "nonexistent"},
            ],
        )

        eq_(r.rowcount, 2)