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# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
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# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
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from __future__ import annotations

import datetime
import os

from airflow import DAG
from airflow.providers.postgres.operators.postgres import PostgresOperator

# [START postgres_operator_howto_guide]


# create_pet_table, populate_pet_table, get_all_pets, and get_birth_date are examples of tasks created by
# instantiating the Postgres Operator

ENV_ID = os.environ.get("SYSTEM_TESTS_ENV_ID")
DAG_ID = "postgres_operator_dag"

with DAG(
    dag_id=DAG_ID,
    start_date=datetime.datetime(2020, 2, 2),
    schedule="@once",
    catchup=False,
) as dag:
    # [START postgres_operator_howto_guide_create_pet_table]
    create_pet_table = PostgresOperator(
        task_id="create_pet_table",
        sql="""
            CREATE TABLE IF NOT EXISTS pet (
            pet_id SERIAL PRIMARY KEY,
            name VARCHAR NOT NULL,
            pet_type VARCHAR NOT NULL,
            birth_date DATE NOT NULL,
            OWNER VARCHAR NOT NULL);
          """,
    )
    # [END postgres_operator_howto_guide_create_pet_table]
    # [START postgres_operator_howto_guide_populate_pet_table]
    populate_pet_table = PostgresOperator(
        task_id="populate_pet_table",
        sql="""
            INSERT INTO pet (name, pet_type, birth_date, OWNER)
            VALUES ( 'Max', 'Dog', '2018-07-05', 'Jane');
            INSERT INTO pet (name, pet_type, birth_date, OWNER)
            VALUES ( 'Susie', 'Cat', '2019-05-01', 'Phil');
            INSERT INTO pet (name, pet_type, birth_date, OWNER)
            VALUES ( 'Lester', 'Hamster', '2020-06-23', 'Lily');
            INSERT INTO pet (name, pet_type, birth_date, OWNER)
            VALUES ( 'Quincy', 'Parrot', '2013-08-11', 'Anne');
            """,
    )
    # [END postgres_operator_howto_guide_populate_pet_table]
    # [START postgres_operator_howto_guide_get_all_pets]
    get_all_pets = PostgresOperator(task_id="get_all_pets", sql="SELECT * FROM pet;")
    # [END postgres_operator_howto_guide_get_all_pets]
    # [START postgres_operator_howto_guide_get_birth_date]
    get_birth_date = PostgresOperator(
        task_id="get_birth_date",
        sql="SELECT * FROM pet WHERE birth_date BETWEEN SYMMETRIC %(begin_date)s AND %(end_date)s",
        parameters={"begin_date": "2020-01-01", "end_date": "2020-12-31"},
        hook_params={"options": "-c statement_timeout=3000ms"},
    )
    # [END postgres_operator_howto_guide_get_birth_date]

    create_pet_table >> populate_pet_table >> get_all_pets >> get_birth_date
    # [END postgres_operator_howto_guide]

#     from tests.system.utils.watcher import watcher
#
#     # This test needs watcher in order to properly mark success/failure
#     # when "tearDown" task with trigger rule is part of the DAG
#     list(dag.tasks) >> watcher()
#
# from tests.system.utils import get_test_run  # noqa: E402
#
# # Needed to run the example DAG with pytest (see: tests/system/README.md#run_via_pytest)
# test_run = get_test_run(dag)