# 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.
from typing import Optional

from flask import current_app, g
from sqlalchemy import and_
from sqlalchemy.orm.session import Session

from airflow.api_connexion import security
from airflow.api_connexion.exceptions import NotFound
from airflow.api_connexion.parameters import check_limit, format_parameters
from airflow.api_connexion.schemas.xcom_schema import (
    XComCollection,
    XComCollectionItemSchema,
    XComCollectionSchema,
    xcom_collection_schema,
    xcom_schema,
)
from airflow.models import DagRun as DR, XCom
from airflow.security import permissions
from airflow.utils.session import provide_session


@security.requires_access(
    [
        (permissions.ACTION_CAN_READ, permissions.RESOURCE_DAG),
        (permissions.ACTION_CAN_READ, permissions.RESOURCE_DAG_RUN),
        (permissions.ACTION_CAN_READ, permissions.RESOURCE_TASK_INSTANCE),
        (permissions.ACTION_CAN_READ, permissions.RESOURCE_XCOM),
    ]
)
@format_parameters({'limit': check_limit})
@provide_session
def get_xcom_entries(
    dag_id: str,
    dag_run_id: str,
    task_id: str,
    session: Session,
    limit: Optional[int],
    offset: Optional[int] = None,
) -> XComCollectionSchema:
    """Get all XCom values"""
    query = session.query(XCom)
    if dag_id == '~':
        appbuilder = current_app.appbuilder
        readable_dag_ids = appbuilder.sm.get_readable_dag_ids(g.user)
        query = query.filter(XCom.dag_id.in_(readable_dag_ids))
        query = query.join(DR, and_(XCom.dag_id == DR.dag_id, XCom.execution_date == DR.execution_date))
    else:
        query = query.filter(XCom.dag_id == dag_id)
        query = query.join(DR, and_(XCom.dag_id == DR.dag_id, XCom.execution_date == DR.execution_date))

    if task_id != '~':
        query = query.filter(XCom.task_id == task_id)
    if dag_run_id != '~':
        query = query.filter(DR.run_id == dag_run_id)
    query = query.order_by(XCom.execution_date, XCom.task_id, XCom.dag_id, XCom.key)
    total_entries = query.count()
    query = query.offset(offset).limit(limit)
    return xcom_collection_schema.dump(XComCollection(xcom_entries=query.all(), total_entries=total_entries))


@security.requires_access(
    [
        (permissions.ACTION_CAN_READ, permissions.RESOURCE_DAG),
        (permissions.ACTION_CAN_READ, permissions.RESOURCE_DAG_RUN),
        (permissions.ACTION_CAN_READ, permissions.RESOURCE_TASK_INSTANCE),
        (permissions.ACTION_CAN_READ, permissions.RESOURCE_XCOM),
    ]
)
@provide_session
def get_xcom_entry(
    dag_id: str, task_id: str, dag_run_id: str, xcom_key: str, session: Session
) -> XComCollectionItemSchema:
    """Get an XCom entry"""
    query = session.query(XCom).filter(XCom.dag_id == dag_id, XCom.task_id == task_id, XCom.key == xcom_key)
    query = query.join(DR, and_(XCom.dag_id == DR.dag_id, XCom.execution_date == DR.execution_date))
    query = query.filter(DR.run_id == dag_run_id)

    query_object = query.one_or_none()
    if not query_object:
        raise NotFound("XCom entry not found")
    return xcom_schema.dump(query_object)