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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.
# isort:skip_file

import json
import logging
from typing import Iterator, Tuple

import yaml
from werkzeug.utils import secure_filename

from superset.commands.export.models import ExportModelsCommand
from superset.connectors.sqla.models import SqlaTable
from superset.datasets.commands.exceptions import DatasetNotFoundError
from superset.datasets.dao import DatasetDAO
from superset.utils.dict_import_export import EXPORT_VERSION

logger = logging.getLogger(__name__)

JSON_KEYS = {"params", "template_params", "extra"}


class ExportDatasetsCommand(ExportModelsCommand):

    dao = DatasetDAO
    not_found = DatasetNotFoundError

    @staticmethod
    def _export(
        model: SqlaTable, export_related: bool = True
    ) -> Iterator[Tuple[str, str]]:
        database_slug = secure_filename(model.database.database_name)
        dataset_slug = secure_filename(model.table_name)
        file_name = f"datasets/{database_slug}/{dataset_slug}.yaml"

        payload = model.export_to_dict(
            recursive=True,
            include_parent_ref=False,
            include_defaults=True,
            export_uuids=True,
        )
        # TODO (betodealmeida): move this logic to export_to_dict once this
        # becomes the default export endpoint
        for key in JSON_KEYS:
            if payload.get(key):
                try:
                    payload[key] = json.loads(payload[key])
                except json.decoder.JSONDecodeError:
                    logger.info("Unable to decode `%s` field: %s", key, payload[key])
        for key in ("metrics", "columns"):
            for attributes in payload.get(key, []):
                if attributes.get("extra"):
                    try:
                        attributes["extra"] = json.loads(attributes["extra"])
                    except json.decoder.JSONDecodeError:
                        logger.info(
                            "Unable to decode `extra` field: %s", attributes["extra"]
                        )

        payload["version"] = EXPORT_VERSION
        payload["database_uuid"] = str(model.database.uuid)

        file_content = yaml.safe_dump(payload, sort_keys=False)
        yield file_name, file_content

        # include database as well
        if export_related:
            file_name = f"databases/{database_slug}.yaml"

            payload = model.database.export_to_dict(
                recursive=False,
                include_parent_ref=False,
                include_defaults=True,
                export_uuids=True,
            )
            # TODO (betodealmeida): move this logic to export_to_dict once this
            # becomes the default export endpoint
            if payload.get("extra"):
                try:
                    payload["extra"] = json.loads(payload["extra"])
                except json.decoder.JSONDecodeError:
                    logger.info("Unable to decode `extra` field: %s", payload["extra"])

            payload["version"] = EXPORT_VERSION

            file_content = yaml.safe_dump(payload, sort_keys=False)
            yield file_name, file_content