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# to you under the Apache License, Version 2.0 (the
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#   http://www.apache.org/licenses/LICENSE-2.0
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"""
This module contains integration with Azure CosmosDB.

AzureCosmosDBHook communicates via the Azure Cosmos library. Make sure that a
Airflow connection of type `azure_cosmos` exists. Authorization can be done by supplying a
login (=Endpoint uri), password (=secret key) and extra fields database_name and collection_name to specify
the default database and collection to use (see connection `azure_cosmos_default` for an example).
"""
import uuid
from typing import Optional

from airflow.exceptions import AirflowBadRequest
from airflow.hooks.base import BaseHook
from azure.cosmos.cosmos_client import CosmosClient
from azure.cosmos.errors import HTTPFailure


class AzureCosmosDBHook(BaseHook):
    """
    Interacts with Azure CosmosDB.

    login should be the endpoint uri, password should be the master key
    optionally, you can use the following extras to default these values
    {"database_name": "<DATABASE_NAME>", "collection_name": "COLLECTION_NAME"}.

    :param azure_cosmos_conn_id: Reference to the Azure CosmosDB connection.
    :type azure_cosmos_conn_id: str
    """

    conn_name_attr = "azure_cosmos_conn_id"
    default_conn_name = "azure_cosmos_default"
    conn_type = "azure_cosmos"
    hook_name = "Azure CosmosDB"

    def __init__(self, azure_cosmos_conn_id: str = default_conn_name) -> None:
        super().__init__()
        self.conn_id = azure_cosmos_conn_id
        self._conn = None

        self.default_database_name = None
        self.default_collection_name = None

    def get_conn(self) -> CosmosClient:
        """Return a cosmos db client."""
        if not self._conn:
            conn = self.get_connection(self.conn_id)
            extras = conn.extra_dejson
            endpoint_uri = conn.login
            master_key = conn.password

            self.default_database_name = extras.get("database_name")
            self.default_collection_name = extras.get("collection_name")

            # Initialize the Python Azure Cosmos DB client
            self._conn = CosmosClient(endpoint_uri, {"masterKey": master_key})
        return self._conn

    def __get_database_name(self, database_name: Optional[str] = None) -> str:
        self.get_conn()
        db_name = database_name
        if db_name is None:
            db_name = self.default_database_name

        if db_name is None:
            raise AirflowBadRequest("Database name must be specified")

        return db_name

    def __get_collection_name(self, collection_name: Optional[str] = None) -> str:
        self.get_conn()
        coll_name = collection_name
        if coll_name is None:
            coll_name = self.default_collection_name

        if coll_name is None:
            raise AirflowBadRequest("Collection name must be specified")

        return coll_name

    def does_collection_exist(self, collection_name: str, database_name: str) -> bool:
        """Checks if a collection exists in CosmosDB."""
        if collection_name is None:
            raise AirflowBadRequest("Collection name cannot be None.")

        existing_container = list(
            self.get_conn().QueryContainers(
                get_database_link(self.__get_database_name(database_name)),
                {
                    "query": "SELECT * FROM r WHERE r.id=@id",
                    "parameters": [{"name": "@id", "value": collection_name}],
                },
            )
        )
        if len(existing_container) == 0:
            return False

        return True

    def create_collection(
        self, collection_name: str, database_name: Optional[str] = None
    ) -> None:
        """Creates a new collection in the CosmosDB database."""
        if collection_name is None:
            raise AirflowBadRequest("Collection name cannot be None.")

        # We need to check to see if this container already exists so we don't try
        # to create it twice
        existing_container = list(
            self.get_conn().QueryContainers(
                get_database_link(self.__get_database_name(database_name)),
                {
                    "query": "SELECT * FROM r WHERE r.id=@id",
                    "parameters": [{"name": "@id", "value": collection_name}],
                },
            )
        )

        # Only create if we did not find it already existing
        if len(existing_container) == 0:
            self.get_conn().CreateContainer(
                get_database_link(self.__get_database_name(database_name)),
                {"id": collection_name},
            )

    def does_database_exist(self, database_name: str) -> bool:
        """Checks if a database exists in CosmosDB."""
        if database_name is None:
            raise AirflowBadRequest("Database name cannot be None.")

        existing_database = list(
            self.get_conn().QueryDatabases(
                {
                    "query": "SELECT * FROM r WHERE r.id=@id",
                    "parameters": [{"name": "@id", "value": database_name}],
                }
            )
        )
        if len(existing_database) == 0:
            return False

        return True

    def create_database(self, database_name: str) -> None:
        """Creates a new database in CosmosDB."""
        if database_name is None:
            raise AirflowBadRequest("Database name cannot be None.")

        # We need to check to see if this database already exists so we don't try
        # to create it twice
        existing_database = list(
            self.get_conn().QueryDatabases(
                {
                    "query": "SELECT * FROM r WHERE r.id=@id",
                    "parameters": [{"name": "@id", "value": database_name}],
                }
            )
        )

        # Only create if we did not find it already existing
        if len(existing_database) == 0:
            self.get_conn().CreateDatabase({"id": database_name})

    def delete_database(self, database_name: str) -> None:
        """Deletes an existing database in CosmosDB."""
        if database_name is None:
            raise AirflowBadRequest("Database name cannot be None.")

        self.get_conn().DeleteDatabase(get_database_link(database_name))

    def delete_collection(
        self, collection_name: str, database_name: Optional[str] = None
    ) -> None:
        """Deletes an existing collection in the CosmosDB database."""
        if collection_name is None:
            raise AirflowBadRequest("Collection name cannot be None.")

        self.get_conn().DeleteContainer(
            get_collection_link(
                self.__get_database_name(database_name), collection_name
            )
        )

    def upsert_document(
        self, document, database_name=None, collection_name=None, document_id=None
    ):
        """
        Inserts a new document (or updates an existing one) into an existing
        collection in the CosmosDB database.
        """
        # Assign unique ID if one isn't provided
        if document_id is None:
            document_id = str(uuid.uuid4())

        if document is None:
            raise AirflowBadRequest("You cannot insert a None document")

        # Add document id if isn't found
        if "id" in document:
            if document["id"] is None:
                document["id"] = document_id
        else:
            document["id"] = document_id

        created_document = self.get_conn().CreateItem(
            get_collection_link(
                self.__get_database_name(database_name),
                self.__get_collection_name(collection_name),
            ),
            document,
        )

        return created_document

    def insert_documents(
        self,
        documents,
        database_name: Optional[str] = None,
        collection_name: Optional[str] = None,
    ) -> list:
        """Insert a list of new documents into an existing collection in the CosmosDB database."""
        if documents is None:
            raise AirflowBadRequest("You cannot insert empty documents")

        created_documents = []
        for single_document in documents:
            created_documents.append(
                self.get_conn().CreateItem(
                    get_collection_link(
                        self.__get_database_name(database_name),
                        self.__get_collection_name(collection_name),
                    ),
                    single_document,
                )
            )

        return created_documents

    def delete_document(
        self,
        document_id: str,
        database_name: Optional[str] = None,
        collection_name: Optional[str] = None,
    ) -> None:
        """Delete an existing document out of a collection in the CosmosDB database."""
        if document_id is None:
            raise AirflowBadRequest("Cannot delete a document without an id")

        self.get_conn().DeleteItem(
            get_document_link(
                self.__get_database_name(database_name),
                self.__get_collection_name(collection_name),
                document_id,
            )
        )

    def get_document(
        self,
        document_id: str,
        database_name: Optional[str] = None,
        collection_name: Optional[str] = None,
    ):
        """Get a document from an existing collection in the CosmosDB database."""
        if document_id is None:
            raise AirflowBadRequest("Cannot get a document without an id")

        try:
            return self.get_conn().ReadItem(
                get_document_link(
                    self.__get_database_name(database_name),
                    self.__get_collection_name(collection_name),
                    document_id,
                )
            )
        except HTTPFailure:
            return None

    def get_documents(
        self,
        sql_string: str,
        database_name: Optional[str] = None,
        collection_name: Optional[str] = None,
        partition_key: Optional[str] = None,
    ) -> Optional[list]:
        """Get a list of documents from an existing collection in the CosmosDB database via SQL query."""
        if sql_string is None:
            raise AirflowBadRequest("SQL query string cannot be None")

        # Query them in SQL
        query = {"query": sql_string}

        try:
            result_iterable = self.get_conn().QueryItems(
                get_collection_link(
                    self.__get_database_name(database_name),
                    self.__get_collection_name(collection_name),
                ),
                query,
                partition_key,
            )

            return list(result_iterable)
        except HTTPFailure:
            return None


def get_database_link(database_id: str) -> str:
    """Get Azure CosmosDB database link"""
    return "dbs/" + database_id


def get_collection_link(database_id: str, collection_id: str) -> str:
    """Get Azure CosmosDB collection link"""
    return get_database_link(database_id) + "/colls/" + collection_id


def get_document_link(database_id: str, collection_id: str, document_id: str) -> str:
    """Get Azure CosmosDB document link"""
    return get_collection_link(database_id, collection_id) + "/docs/" + document_id