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#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# 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
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.
"""
Note:  DMS requires you to configure specific IAM roles/permissions.  For more information, see
https://docs.aws.amazon.com/dms/latest/userguide/CHAP_Security.html#CHAP_Security.APIRole
"""

from __future__ import annotations

import json
from datetime import datetime
from typing import cast

import boto3
from sqlalchemy import Column, MetaData, String, Table, create_engine

from airflow.decorators import task
from airflow.models.baseoperator import chain
from airflow.models.dag import DAG
from airflow.providers.amazon.aws.operators.dms import (
    DmsCreateTaskOperator,
    DmsDeleteTaskOperator,
    DmsDescribeTasksOperator,
    DmsStartTaskOperator,
    DmsStopTaskOperator,
)
from airflow.providers.amazon.aws.operators.rds import (
    RdsCreateDbInstanceOperator,
    RdsDeleteDbInstanceOperator,
)
from airflow.providers.amazon.aws.operators.s3 import S3CreateBucketOperator, S3DeleteBucketOperator
from airflow.providers.amazon.aws.sensors.dms import DmsTaskBaseSensor, DmsTaskCompletedSensor
from airflow.utils.trigger_rule import TriggerRule
from system.amazon.aws.utils import ENV_ID_KEY, SystemTestContextBuilder
from system.amazon.aws.utils.ec2 import get_default_vpc_id



DAG_ID = "example_dms"



ROLE_ARN_KEY = "ROLE_ARN"




sys_test_context_task = SystemTestContextBuilder().add_variable(ROLE_ARN_KEY).build()


# Config values for setting up the "Source" database.


RDS_ENGINE = "postgres"



RDS_PROTOCOL = "postgresql"



RDS_USERNAME = "username"

# NEVER store your production password in plaintext in a DAG like this.
# Use Airflow Secrets or a secret manager for this in production.


RDS_PASSWORD = "rds_password"



TABLE_HEADERS = ["apache_project", "release_year"]



SAMPLE_DATA = [
    ("Airflow", "2015"),
    ("OpenOffice", "2012"),
    ("Subversion", "2000"),
    ("NiFi", "2006"),
]



SG_IP_PERMISSION = {
    "FromPort": 5432,
    "IpProtocol": "All",
    "IpRanges": [{"CidrIp": "0.0.0.0/0"}],
}



def _get_rds_instance_endpoint(instance_name: str):
    print("Retrieving RDS instance endpoint.")
    rds_client = boto3.client("rds")

    response = rds_client.describe_db_instances(DBInstanceIdentifier=instance_name)
    rds_instance_endpoint = response["DBInstances"][0]["Endpoint"]
    return rds_instance_endpoint


@task


def create_security_group(security_group_name: str, vpc_id: str):
    client = boto3.client("ec2")
    security_group = client.create_security_group(
        GroupName=security_group_name,
        Description="Created for DMS system test",
        VpcId=vpc_id,
    )
    client.get_waiter("security_group_exists").wait(
        GroupIds=[security_group["GroupId"]],
    )
    client.authorize_security_group_ingress(
        GroupId=security_group["GroupId"],
        IpPermissions=[SG_IP_PERMISSION],
    )

    return security_group["GroupId"]



@task


def create_sample_table(instance_name: str, db_name: str, table_name: str):
    print("Creating sample table.")

    rds_endpoint = _get_rds_instance_endpoint(instance_name)
    hostname = rds_endpoint["Address"]
    port = rds_endpoint["Port"]
    rds_url = f"{RDS_PROTOCOL}://{RDS_USERNAME}:{RDS_PASSWORD}@{hostname}:{port}/{db_name}"
    engine = create_engine(rds_url)

    table = Table(
        table_name,
        MetaData(engine),
        Column(TABLE_HEADERS[0], String, primary_key=True),
        Column(TABLE_HEADERS[1], String),
    )

    with engine.connect() as connection:
        # Create the Table.
        table.create()
        load_data = table.insert().values(SAMPLE_DATA)
        connection.execute(load_data)

        # Read the data back to verify everything is working.
        connection.execute(table.select())



@task(multiple_outputs=True)


def create_dms_assets(
    db_name: str,
    instance_name: str,
    replication_instance_name: str,
    bucket_name: str,
    role_arn,
    source_endpoint_identifier: str,
    target_endpoint_identifier: str,
    table_definition: dict,
):
    print("Creating DMS assets.")
    dms_client = boto3.client("dms")
    rds_instance_endpoint = _get_rds_instance_endpoint(instance_name)

    print("Creating replication instance.")
    instance_arn = dms_client.create_replication_instance(
        ReplicationInstanceIdentifier=replication_instance_name,
        ReplicationInstanceClass="dms.t3.micro",
    )["ReplicationInstance"]["ReplicationInstanceArn"]

    print("Creating DMS source endpoint.")
    source_endpoint_arn = dms_client.create_endpoint(
        EndpointIdentifier=source_endpoint_identifier,
        EndpointType="source",
        EngineName=RDS_ENGINE,
        Username=RDS_USERNAME,
        Password=RDS_PASSWORD,
        ServerName=rds_instance_endpoint["Address"],
        Port=rds_instance_endpoint["Port"],
        DatabaseName=db_name,
    )["Endpoint"]["EndpointArn"]

    print("Creating DMS target endpoint.")
    target_endpoint_arn = dms_client.create_endpoint(
        EndpointIdentifier=target_endpoint_identifier,
        EndpointType="target",
        EngineName="s3",
        S3Settings={
            "BucketName": bucket_name,
            "BucketFolder": "folder",
            "ServiceAccessRoleArn": role_arn,
            "ExternalTableDefinition": json.dumps(table_definition),
        },
    )["Endpoint"]["EndpointArn"]

    print("Awaiting replication instance provisioning.")
    dms_client.get_waiter("replication_instance_available").wait(
        Filters=[{"Name": "replication-instance-arn", "Values": [instance_arn]}]
    )

    return {
        "replication_instance_arn": instance_arn,
        "source_endpoint_arn": source_endpoint_arn,
        "target_endpoint_arn": target_endpoint_arn,
    }



@task(trigger_rule=TriggerRule.ALL_DONE)


def delete_dms_assets(
    replication_instance_arn: str,
    source_endpoint_arn: str,
    target_endpoint_arn: str,
    source_endpoint_identifier: str,
    target_endpoint_identifier: str,
    replication_instance_name: str,
):
    dms_client = boto3.client("dms")

    print("Deleting DMS assets.")
    dms_client.delete_replication_instance(ReplicationInstanceArn=replication_instance_arn)
    dms_client.delete_endpoint(EndpointArn=source_endpoint_arn)
    dms_client.delete_endpoint(EndpointArn=target_endpoint_arn)

    print("Awaiting DMS assets tear-down.")
    dms_client.get_waiter("replication_instance_deleted").wait(
        Filters=[{"Name": "replication-instance-id", "Values": [replication_instance_name]}]
    )
    dms_client.get_waiter("endpoint_deleted").wait(
        Filters=[
            {
                "Name": "endpoint-id",
                "Values": [source_endpoint_identifier, target_endpoint_identifier],
            }
        ]
    )



@task(trigger_rule=TriggerRule.ALL_DONE)


def delete_security_group(security_group_id: str, security_group_name: str):
    boto3.client("ec2").delete_security_group(GroupId=security_group_id, GroupName=security_group_name)



with DAG(
    DAG_ID,
    schedule="@once",
    start_date=datetime(2021, 1, 1),
    tags=["example"],
    catchup=False,
) as dag:


    test_context = sys_test_context_task()

    env_id = test_context[ENV_ID_KEY]
    role_arn = test_context[ROLE_ARN_KEY]

    bucket_name = f"{env_id}-dms-bucket"
    rds_instance_name = f"{env_id}-instance"
    rds_db_name = f"{env_id}_source_database"  # dashes are not allowed in db name
    rds_table_name = f"{env_id}-table"
    dms_replication_instance_name = f"{env_id}-replication-instance"
    dms_replication_task_id = f"{env_id}-replication-task"
    source_endpoint_identifier = f"{env_id}-source-endpoint"
    target_endpoint_identifier = f"{env_id}-target-endpoint"
    security_group_name = f"{env_id}-dms-security-group"

    # Sample data.
    table_definition = {
        "TableCount": "1",
        "Tables": [
            {
                "TableName": rds_table_name,
                "TableColumns": [
                    {
                        "ColumnName": TABLE_HEADERS[0],
                        "ColumnType": "STRING",
                        "ColumnNullable": "false",
                        "ColumnIsPk": "true",
                    },
                    {"ColumnName": TABLE_HEADERS[1], "ColumnType": "STRING", "ColumnLength": "4"},
                ],
                "TableColumnsTotal": "2",
            }
        ],
    }
    table_mappings = {
        "rules": [
            {
                "rule-type": "selection",
                "rule-id": "1",
                "rule-name": "1",
                "object-locator": {
                    "schema-name": "public",
                    "table-name": rds_table_name,
                },
                "rule-action": "include",
            }
        ]
    }

    create_s3_bucket = S3CreateBucketOperator(task_id="create_s3_bucket", bucket_name=bucket_name)

    get_vpc_id = get_default_vpc_id()

    create_sg = create_security_group(security_group_name, get_vpc_id)

    create_db_instance = RdsCreateDbInstanceOperator(
        task_id="create_db_instance",
        db_instance_identifier=rds_instance_name,
        db_instance_class="db.t3.micro",
        engine=RDS_ENGINE,
        rds_kwargs={
            "DBName": rds_db_name,
            "AllocatedStorage": 20,
            "MasterUsername": RDS_USERNAME,
            "MasterUserPassword": RDS_PASSWORD,
            "PubliclyAccessible": True,
            "VpcSecurityGroupIds": [
                create_sg,
            ],
        },
    )

    create_assets = create_dms_assets(
        db_name=rds_db_name,
        instance_name=rds_instance_name,
        replication_instance_name=dms_replication_instance_name,
        bucket_name=bucket_name,
        role_arn=role_arn,
        source_endpoint_identifier=source_endpoint_identifier,
        target_endpoint_identifier=target_endpoint_identifier,
        table_definition=table_definition,
    )

    # [START howto_operator_dms_create_task]
    create_task = DmsCreateTaskOperator(
        task_id="create_task",
        replication_task_id=dms_replication_task_id,
        source_endpoint_arn=create_assets["source_endpoint_arn"],
        target_endpoint_arn=create_assets["target_endpoint_arn"],
        replication_instance_arn=create_assets["replication_instance_arn"],
        table_mappings=table_mappings,
    )
    # [END howto_operator_dms_create_task]

    task_arn = cast(str, create_task.output)

    # [START howto_operator_dms_start_task]
    start_task = DmsStartTaskOperator(
        task_id="start_task",
        replication_task_arn=task_arn,
    )
    # [END howto_operator_dms_start_task]

    # [START howto_operator_dms_describe_tasks]
    describe_tasks = DmsDescribeTasksOperator(
        task_id="describe_tasks",
        describe_tasks_kwargs={
            "Filters": [
                {
                    "Name": "replication-instance-arn",
                    "Values": [create_assets["replication_instance_arn"]],
                }
            ]
        },
        do_xcom_push=False,
    )
    # [END howto_operator_dms_describe_tasks]

    await_task_start = DmsTaskBaseSensor(
        task_id="await_task_start",
        replication_task_arn=task_arn,
        target_statuses=["running"],
        termination_statuses=["stopped", "deleting", "failed"],
        poke_interval=10,
    )

    # [START howto_operator_dms_stop_task]
    stop_task = DmsStopTaskOperator(
        task_id="stop_task",
        replication_task_arn=task_arn,
    )
    # [END howto_operator_dms_stop_task]

    # TaskCompletedSensor actually waits until task reaches the "Stopped" state, so it will work here.
    # [START howto_sensor_dms_task_completed]
    await_task_stop = DmsTaskCompletedSensor(
        task_id="await_task_stop",
        replication_task_arn=task_arn,
    )
    # [END howto_sensor_dms_task_completed]
    await_task_stop.poke_interval = 10

    # [START howto_operator_dms_delete_task]
    delete_task = DmsDeleteTaskOperator(
        task_id="delete_task",
        replication_task_arn=task_arn,
    )
    # [END howto_operator_dms_delete_task]
    delete_task.trigger_rule = TriggerRule.ALL_DONE

    delete_assets = delete_dms_assets(
        replication_instance_arn=create_assets["replication_instance_arn"],
        source_endpoint_arn=create_assets["source_endpoint_arn"],
        target_endpoint_arn=create_assets["target_endpoint_arn"],
        source_endpoint_identifier=source_endpoint_identifier,
        target_endpoint_identifier=target_endpoint_identifier,
        replication_instance_name=dms_replication_instance_name,
    )

    delete_db_instance = RdsDeleteDbInstanceOperator(
        task_id="delete_db_instance",
        db_instance_identifier=rds_instance_name,
        rds_kwargs={
            "SkipFinalSnapshot": True,
        },
        trigger_rule=TriggerRule.ALL_DONE,
    )

    delete_s3_bucket = S3DeleteBucketOperator(
        task_id="delete_s3_bucket",
        bucket_name=bucket_name,
        force_delete=True,
        trigger_rule=TriggerRule.ALL_DONE,
    )

    chain(
        # TEST SETUP
        test_context,
        create_s3_bucket,
        get_vpc_id,
        create_sg,
        create_db_instance,
        create_sample_table(rds_instance_name, rds_db_name, rds_table_name),
        create_assets,
        # TEST BODY
        create_task,
        start_task,
        describe_tasks,
        await_task_start,
        stop_task,
        await_task_stop,
        # TEST TEARDOWN
        delete_task,
        delete_assets,
        delete_db_instance,
        delete_security_group(create_sg, security_group_name),
        delete_s3_bucket,
    )

    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)

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