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from __future__ import annotations

import os
from datetime import datetime

from googleapiclient.discovery import build
from googleapiclient.errors import HttpError

from airflow.decorators import task
from airflow.exceptions import AirflowException
from airflow.models.baseoperator import chain
from airflow.models.dag import DAG
from airflow.providers.google.cloud.operators.cloud_composer import (
    CloudComposerCreateEnvironmentOperator,
    CloudComposerDeleteEnvironmentOperator,
    CloudComposerGetEnvironmentOperator,
    CloudComposerListEnvironmentsOperator,
    CloudComposerListImageVersionsOperator,
    CloudComposerRunAirflowCLICommandOperator,
    CloudComposerUpdateEnvironmentOperator,
)
from airflow.providers.google.cloud.sensors.cloud_composer import CloudComposerDAGRunSensor
from airflow.utils.trigger_rule import TriggerRule

ENV_ID = os.environ.get("SYSTEM_TESTS_ENV_ID", "default")
PROJECT_ID = os.environ.get("SYSTEM_TESTS_GCP_PROJECT", "default")
PROJECT_NUMBER = "{{ task_instance.xcom_pull('get_project_number') }}"

DAG_ID = "composer"
REGION = "us-central1"

# [START howto_operator_composer_simple_environment]

ENVIRONMENT_ID = f"test-{DAG_ID}-{ENV_ID}".replace("_", "-")
ENVIRONMENT_ID_ASYNC = f"test-deferrable-{DAG_ID}-{ENV_ID}".replace("_", "-")

ENVIRONMENT = {
    "config": {
        "software_config": {"image_version": "composer-2-airflow-2"},
        "node_config": {
            "service_account": f"{PROJECT_NUMBER}-compute@developer.gserviceaccount.com",
        },
    },
}
# [END howto_operator_composer_simple_environment]

# [START howto_operator_composer_update_environment]
UPDATED_ENVIRONMENT = {
    "labels": {
        "label": "testing",
    }
}
UPDATE_MASK = {"paths": ["labels.label"]}
# [END howto_operator_composer_update_environment]

COMMAND = "dags list -o json --verbose"


@task(task_id="get_project_number")
def get_project_number():
    """Helper function to retrieve the number of the project based on PROJECT_ID"""
    try:
        with build("cloudresourcemanager", "v1") as service:
            response = service.projects().get(projectId=PROJECT_ID).execute()
        return response["projectNumber"]
    except HttpError as exc:
        if exc.status_code == 403:
            raise AirflowException(
                "No project found with specified name, "
                "or caller does not have permissions to read specified project"
            )
        raise exc


with DAG(
    DAG_ID,
    schedule="@once",
    start_date=datetime(2021, 1, 1),
    catchup=False,
    tags=["example", "composer"],
) as dag:
    # [START howto_operator_composer_image_list]
    image_versions = CloudComposerListImageVersionsOperator(
        task_id="image_versions",
        project_id=PROJECT_ID,
        region=REGION,
    )
    # [END howto_operator_composer_image_list]

    # [START howto_operator_create_composer_environment]
    create_env = CloudComposerCreateEnvironmentOperator(
        task_id="create_env",
        project_id=PROJECT_ID,
        region=REGION,
        environment_id=ENVIRONMENT_ID,
        environment=ENVIRONMENT,
    )
    # [END howto_operator_create_composer_environment]

    # [START howto_operator_create_composer_environment_deferrable_mode]
    defer_create_env = CloudComposerCreateEnvironmentOperator(
        task_id="defer_create_env",
        project_id=PROJECT_ID,
        region=REGION,
        environment_id=ENVIRONMENT_ID_ASYNC,
        environment=ENVIRONMENT,
        deferrable=True,
    )
    # [END howto_operator_create_composer_environment_deferrable_mode]

    # [START howto_operator_list_composer_environments]
    list_envs = CloudComposerListEnvironmentsOperator(
        task_id="list_envs", project_id=PROJECT_ID, region=REGION
    )
    # [END howto_operator_list_composer_environments]

    # [START howto_operator_get_composer_environment]
    get_env = CloudComposerGetEnvironmentOperator(
        task_id="get_env",
        project_id=PROJECT_ID,
        region=REGION,
        environment_id=ENVIRONMENT_ID,
    )
    # [END howto_operator_get_composer_environment]

    # [START howto_operator_update_composer_environment]
    update_env = CloudComposerUpdateEnvironmentOperator(
        task_id="update_env",
        project_id=PROJECT_ID,
        region=REGION,
        environment_id=ENVIRONMENT_ID,
        update_mask=UPDATE_MASK,
        environment=UPDATED_ENVIRONMENT,
    )
    # [END howto_operator_update_composer_environment]

    # [START howto_operator_update_composer_environment_deferrable_mode]
    defer_update_env = CloudComposerUpdateEnvironmentOperator(
        task_id="defer_update_env",
        project_id=PROJECT_ID,
        region=REGION,
        environment_id=ENVIRONMENT_ID_ASYNC,
        update_mask=UPDATE_MASK,
        environment=UPDATED_ENVIRONMENT,
        deferrable=True,
    )
    # [END howto_operator_update_composer_environment_deferrable_mode]

    # [START howto_operator_run_airflow_cli_command]
    run_airflow_cli_cmd = CloudComposerRunAirflowCLICommandOperator(
        task_id="run_airflow_cli_cmd",
        project_id=PROJECT_ID,
        region=REGION,
        environment_id=ENVIRONMENT_ID,
        command=COMMAND,
    )
    # [END howto_operator_run_airflow_cli_command]

    # [START howto_operator_run_airflow_cli_command_deferrable_mode]
    defer_run_airflow_cli_cmd = CloudComposerRunAirflowCLICommandOperator(
        task_id="defer_run_airflow_cli_cmd",
        project_id=PROJECT_ID,
        region=REGION,
        environment_id=ENVIRONMENT_ID_ASYNC,
        command=COMMAND,
        deferrable=True,
    )
    # [END howto_operator_run_airflow_cli_command_deferrable_mode]

    # [START howto_sensor_dag_run]
    dag_run_sensor = CloudComposerDAGRunSensor(
        task_id="dag_run_sensor",
        project_id=PROJECT_ID,
        region=REGION,
        environment_id=ENVIRONMENT_ID,
        composer_dag_id="airflow_monitoring",
        allowed_states=["success"],
    )
    # [END howto_sensor_dag_run]

    # [START howto_sensor_dag_run_deferrable_mode]
    defer_dag_run_sensor = CloudComposerDAGRunSensor(
        task_id="defer_dag_run_sensor",
        project_id=PROJECT_ID,
        region=REGION,
        environment_id=ENVIRONMENT_ID_ASYNC,
        composer_dag_id="airflow_monitoring",
        allowed_states=["success"],
        deferrable=True,
    )
    # [END howto_sensor_dag_run_deferrable_mode]

    # [START howto_operator_delete_composer_environment]
    delete_env = CloudComposerDeleteEnvironmentOperator(
        task_id="delete_env",
        project_id=PROJECT_ID,
        region=REGION,
        environment_id=ENVIRONMENT_ID,
    )
    # [END howto_operator_delete_composer_environment]
    delete_env.trigger_rule = TriggerRule.ALL_DONE

    # [START howto_operator_delete_composer_environment_deferrable_mode]
    defer_delete_env = CloudComposerDeleteEnvironmentOperator(
        task_id="defer_delete_env",
        project_id=PROJECT_ID,
        region=REGION,
        environment_id=ENVIRONMENT_ID_ASYNC,
        deferrable=True,
    )
    # [END howto_operator_delete_composer_environment_deferrable_mode]
    defer_delete_env.trigger_rule = TriggerRule.ALL_DONE

    chain(
        # TEST SETUP
        get_project_number(),
        image_versions,
        # TEST BODY
        [create_env, defer_create_env],
        list_envs,
        get_env,
        [update_env, defer_update_env],
        [run_airflow_cli_cmd, defer_run_airflow_cli_cmd],
        [dag_run_sensor, defer_dag_run_sensor],
        # TEST TEARDOWN
        [delete_env, defer_delete_env],
    )

    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: tests/system/README.md#run_via_pytest)
test_run = get_test_run(dag)
