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#
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# isort:skip_file
from typing import Any

import pytest
from sqlalchemy.engine import Engine

from tests.test_app import app

from superset import db
from superset.utils.core import get_example_database, json_dumps_w_dates


CTAS_SCHEMA_NAME = "sqllab_test_db"
ADMIN_SCHEMA_NAME = "admin_database"


@pytest.fixture(autouse=True, scope="session")
def setup_sample_data() -> Any:
    with app.app_context():
        setup_presto_if_needed()

        from superset.cli import load_test_users_run

        load_test_users_run()

        from superset import examples

        examples.load_css_templates()

    yield

    with app.app_context():
        engine = get_example_database().get_sqla_engine()

        # drop sqlachemy tables

        db.session.commit()
        from sqlalchemy.ext import declarative

        sqla_base = declarative.declarative_base()
        # uses sorted_tables to drop in proper order without violating foreign constrains
        for table in sqla_base.metadata.sorted_tables:
            table.__table__.drop()
        db.session.commit()


def drop_from_schema(engine: Engine, schema_name: str):
    schemas = engine.execute(f"SHOW SCHEMAS").fetchall()
    if schema_name not in [s[0] for s in schemas]:
        # schema doesn't exist
        return
    tables_or_views = engine.execute(f"SHOW TABLES in {schema_name}").fetchall()
    for tv in tables_or_views:
        engine.execute(f"DROP TABLE IF EXISTS {schema_name}.{tv[0]}")
        engine.execute(f"DROP VIEW IF EXISTS {schema_name}.{tv[0]}")


def setup_presto_if_needed():
    backend = app.config["SQLALCHEMY_EXAMPLES_URI"].split("://")[0]
    database = get_example_database()
    extra = database.get_extra()

    if backend == "presto":
        # decrease poll interval for tests
        extra = {
            **extra,
            "engine_params": {
                "connect_args": {"poll_interval": app.config["PRESTO_POLL_INTERVAL"]}
            },
        }
    else:
        # remove `poll_interval` from databases that do not support it
        extra = {**extra, "engine_params": {}}
    database.extra = json_dumps_w_dates(extra)
    db.session.commit()

    if backend in {"presto", "hive"}:
        database = get_example_database()
        engine = database.get_sqla_engine()
        drop_from_schema(engine, CTAS_SCHEMA_NAME)
        engine.execute(f"DROP SCHEMA IF EXISTS {CTAS_SCHEMA_NAME}")
        engine.execute(f"CREATE SCHEMA {CTAS_SCHEMA_NAME}")

        drop_from_schema(engine, ADMIN_SCHEMA_NAME)
        engine.execute(f"DROP SCHEMA IF EXISTS {ADMIN_SCHEMA_NAME}")
        engine.execute(f"CREATE SCHEMA {ADMIN_SCHEMA_NAME}")