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"""
This is an example DAG for the use of the SQLExecuteQueryOperator with Sqlite.
In this example, we create two tasks that execute in sequence.
The first task calls an sql command, defined in the SQLite operator,
which when triggered, is performed on the connected sqlite database.
The second task is similar but instead calls the SQL command from an external file.
"""

from __future__ import annotations

import os
from datetime import datetime

from airflow import DAG
from airflow.providers.common.sql.operators.sql import SQLExecuteQueryOperator
from airflow.providers.sqlite.hooks.sqlite import SqliteHook

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

with DAG(
    dag_id=DAG_ID,
    schedule="@daily",
    start_date=datetime(2021, 1, 1),
    tags=["example"],
    catchup=False,
) as dag:
    # [START howto_operator_sqlite]

    # Example of creating a task that calls a common CREATE TABLE sql command.
    create_table_sqlite_task = SQLExecuteQueryOperator(
        task_id="create_table_sqlite",
        sql=r"""
        CREATE TABLE Customers (
            customer_id INT PRIMARY KEY,
            first_name TEXT,
            last_name TEXT
        );
        """,
    )

    # [END howto_operator_sqlite]

    @dag.task(task_id="insert_sqlite_task")
    def insert_sqlite_hook():
        sqlite_hook = SqliteHook()

        rows = [("James", "11"), ("James", "22"), ("James", "33")]
        target_fields = ["first_name", "last_name"]
        sqlite_hook.insert_rows(table="Customers", rows=rows, target_fields=target_fields)

    @dag.task(task_id="replace_sqlite_task")
    def replace_sqlite_hook():
        sqlite_hook = SqliteHook()

        rows = [("James", "11"), ("James", "22"), ("James", "33")]
        target_fields = ["first_name", "last_name"]
        sqlite_hook.insert_rows(table="Customers", rows=rows, target_fields=target_fields, replace=True)

    # [START howto_operator_sqlite_external_file]

    # Example of creating a task that calls an sql command from an external file.
    external_create_table_sqlite_task = SQLExecuteQueryOperator(
        task_id="create_table_sqlite_external_file",
        sql="create_table.sql",
    )

    # [END howto_operator_sqlite_external_file]

    (
        create_table_sqlite_task
        >> external_create_table_sqlite_task
        >> insert_sqlite_hook()
        >> replace_sqlite_hook()
    )

    from tests_common.test_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_common.test_utils.system_tests import get_test_run  # noqa: E402

# Needed to run the example DAG with pytest (see: contributing-docs/testing/system_tests.rst)
test_run = get_test_run(dag)
