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"""
Example Airflow DAG for Elasticsearch Query.
"""
from __future__ import annotations

import os
from datetime import datetime

from airflow import models
from airflow.decorators import task
from airflow.operators.python import PythonOperator
from airflow.providers.elasticsearch.hooks.elasticsearch import ElasticsearchPythonHook, ElasticsearchSQLHook

ENV_ID = os.environ.get("SYSTEM_TESTS_ENV_ID")
DAG_ID = "elasticsearch_dag"
CONN_ID = "elasticsearch_default"


@task(task_id="es_print_tables")
def show_tables():
    """
    show_tables queries elasticsearch to list available tables
    """
    # [START howto_elasticsearch_query]
    es = ElasticsearchSQLHook(elasticsearch_conn_id=CONN_ID)

    # Handle ES conn with context manager
    with es.get_conn() as es_conn:
        tables = es_conn.execute("SHOW TABLES")
        for table, *_ in tables:
            print(f"table: {table}")
    return True
    # [END howto_elasticsearch_query]


# [START howto_elasticsearch_python_hook]
def use_elasticsearch_hook():
    """
    Use ElasticSearchPythonHook to print results from a local Elasticsearch
    """
    es_hosts = ["http://localhost:9200"]
    es_hook = ElasticsearchPythonHook(hosts=es_hosts)
    query = {"query": {"match_all": {}}}
    result = es_hook.search(query=query)
    print(result)
    return True


# [END howto_elasticsearch_python_hook]


with models.DAG(
    DAG_ID,
    schedule="@once",
    start_date=datetime(2021, 1, 1),
    catchup=False,
    tags=["example", "elasticsearch"],
) as dag:
    execute_query = show_tables()
    (
        # TEST BODY
        execute_query
    )
    es_python_test = PythonOperator(
        task_id="print_data_from_elasticsearch", python_callable=use_elasticsearch_hook
    )

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)
