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# 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 Any, Dict, List, Optional

from marshmallow import Schema, validate
from marshmallow.exceptions import ValidationError
from sqlalchemy.orm import Session

from superset import db
from superset.commands.base import BaseCommand
from superset.commands.exceptions import CommandInvalidError
from superset.commands.importers.v1.utils import (
    load_metadata,
    load_yaml,
    METADATA_FILE_NAME,
)
from superset.databases.commands.importers.v1.utils import import_database
from superset.databases.schemas import ImportV1DatabaseSchema
from superset.datasets.commands.importers.v1.utils import import_dataset
from superset.datasets.schemas import ImportV1DatasetSchema
from superset.models.core import Database

schemas: Dict[str, Schema] = {
    "databases/": ImportV1DatabaseSchema(),
    "datasets/": ImportV1DatasetSchema(),
}


class ImportDatabasesCommand(BaseCommand):

    """Import databases"""

    # pylint: disable=unused-argument
    def __init__(self, contents: Dict[str, str], *args: Any, **kwargs: Any):
        self.contents = contents
        self._configs: Dict[str, Any] = {}

    def _import_bundle(self, session: Session) -> None:
        # first import databases
        database_ids: Dict[str, int] = {}
        for file_name, config in self._configs.items():
            if file_name.startswith("databases/"):
                database = import_database(session, config, overwrite=True)
                database_ids[str(database.uuid)] = database.id

        # import related datasets
        for file_name, config in self._configs.items():
            if (
                file_name.startswith("datasets/")
                and config["database_uuid"] in database_ids
            ):
                config["database_id"] = database_ids[config["database_uuid"]]
                # overwrite=False prevents deleting any non-imported columns/metrics
                import_dataset(session, config, overwrite=False)

    def run(self) -> None:
        self.validate()

        # rollback to prevent partial imports
        try:
            self._import_bundle(db.session)
            db.session.commit()
        except Exception as exc:
            db.session.rollback()
            raise exc

    def validate(self) -> None:
        exceptions: List[ValidationError] = []

        # verify that the metadata file is present and valid
        try:
            metadata: Optional[Dict[str, str]] = load_metadata(self.contents)
        except ValidationError as exc:
            exceptions.append(exc)
            metadata = None

        for file_name, content in self.contents.items():
            prefix = file_name.split("/")[0]
            schema = schemas.get(f"{prefix}/")
            if schema:
                try:
                    config = load_yaml(file_name, content)
                    schema.load(config)
                    self._configs[file_name] = config
                except ValidationError as exc:
                    exc.messages = {file_name: exc.messages}
                    exceptions.append(exc)

        # validate that the type declared in METADATA_FILE_NAME is correct
        if metadata:
            type_validator = validate.Equal(Database.__name__)
            try:
                type_validator(metadata["type"])
            except ValidationError as exc:
                exc.messages = {METADATA_FILE_NAME: {"type": exc.messages}}
                exceptions.append(exc)

        if exceptions:
            exception = CommandInvalidError("Error importing database")
            exception.add_list(exceptions)
            raise exception
