# 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.
import json
import logging
from datetime import datetime
from distutils.util import strtobool
from io import BytesIO
from typing import Any
from zipfile import is_zipfile, ZipFile

import yaml
from flask import g, request, Response, send_file
from flask_appbuilder.api import expose, protect, rison, safe
from flask_appbuilder.models.sqla.interface import SQLAInterface
from flask_babel import ngettext
from marshmallow import ValidationError

from superset import event_logger, is_feature_enabled
from superset.commands.exceptions import CommandInvalidError
from superset.commands.importers.v1.utils import get_contents_from_bundle
from superset.connectors.sqla.models import SqlaTable
from superset.constants import MODEL_API_RW_METHOD_PERMISSION_MAP, RouteMethod
from superset.databases.filters import DatabaseFilter
from superset.datasets.commands.bulk_delete import BulkDeleteDatasetCommand
from superset.datasets.commands.create import CreateDatasetCommand
from superset.datasets.commands.delete import DeleteDatasetCommand
from superset.datasets.commands.exceptions import (
    DatasetBulkDeleteFailedError,
    DatasetCreateFailedError,
    DatasetDeleteFailedError,
    DatasetForbiddenError,
    DatasetImportError,
    DatasetInvalidError,
    DatasetNotFoundError,
    DatasetRefreshFailedError,
    DatasetUpdateFailedError,
)
from superset.datasets.commands.export import ExportDatasetsCommand
from superset.datasets.commands.importers.dispatcher import ImportDatasetsCommand
from superset.datasets.commands.refresh import RefreshDatasetCommand
from superset.datasets.commands.update import UpdateDatasetCommand
from superset.datasets.dao import DatasetDAO
from superset.datasets.filters import DatasetIsNullOrEmptyFilter
from superset.datasets.schemas import (
    DatasetPostSchema,
    DatasetPutSchema,
    DatasetRelatedObjectsResponse,
    get_delete_ids_schema,
    get_export_ids_schema,
)
from superset.views.base import DatasourceFilter, generate_download_headers
from superset.views.base_api import (
    BaseSupersetModelRestApi,
    RelatedFieldFilter,
    statsd_metrics,
)
from superset.views.filters import FilterRelatedOwners

logger = logging.getLogger(__name__)


class DatasetRestApi(BaseSupersetModelRestApi):
    datamodel = SQLAInterface(SqlaTable)
    base_filters = [["id", DatasourceFilter, lambda: []]]

    resource_name = "dataset"
    allow_browser_login = True
    class_permission_name = "Dataset"
    method_permission_name = MODEL_API_RW_METHOD_PERMISSION_MAP
    include_route_methods = RouteMethod.REST_MODEL_VIEW_CRUD_SET | {
        RouteMethod.EXPORT,
        RouteMethod.IMPORT,
        RouteMethod.RELATED,
        RouteMethod.DISTINCT,
        "bulk_delete",
        "refresh",
        "related_objects",
    }
    list_columns = [
        "id",
        "database.id",
        "database.database_name",
        "changed_by_name",
        "changed_by_url",
        "changed_by.first_name",
        "changed_by.username",
        "changed_on_utc",
        "changed_on_delta_humanized",
        "default_endpoint",
        "explore_url",
        "extra",
        "kind",
        "owners.id",
        "owners.username",
        "owners.first_name",
        "owners.last_name",
        "schema",
        "sql",
        "table_name",
    ]
    list_select_columns = list_columns + ["changed_on", "changed_by_fk"]
    order_columns = [
        "table_name",
        "schema",
        "changed_by.first_name",
        "changed_on_delta_humanized",
        "database.database_name",
    ]
    show_columns = [
        "id",
        "database.database_name",
        "database.id",
        "table_name",
        "sql",
        "filter_select_enabled",
        "fetch_values_predicate",
        "schema",
        "description",
        "main_dttm_col",
        "offset",
        "default_endpoint",
        "cache_timeout",
        "is_sqllab_view",
        "template_params",
        "owners.id",
        "owners.username",
        "owners.first_name",
        "owners.last_name",
        "columns",
        "metrics",
        "datasource_type",
        "url",
        "extra",
    ]
    add_model_schema = DatasetPostSchema()
    edit_model_schema = DatasetPutSchema()
    add_columns = ["database", "schema", "table_name", "owners"]
    edit_columns = [
        "table_name",
        "sql",
        "filter_select_enabled",
        "fetch_values_predicate",
        "schema",
        "description",
        "main_dttm_col",
        "offset",
        "default_endpoint",
        "cache_timeout",
        "is_sqllab_view",
        "template_params",
        "owners",
        "columns",
        "metrics",
        "extra",
    ]
    openapi_spec_tag = "Datasets"
    related_field_filters = {
        "owners": RelatedFieldFilter("first_name", FilterRelatedOwners),
        "database": "database_name",
    }
    search_filters = {"sql": [DatasetIsNullOrEmptyFilter]}
    filter_rel_fields = {"database": [["id", DatabaseFilter, lambda: []]]}
    allowed_rel_fields = {"database", "owners"}
    allowed_distinct_fields = {"schema"}

    apispec_parameter_schemas = {
        "get_export_ids_schema": get_export_ids_schema,
    }
    openapi_spec_component_schemas = (DatasetRelatedObjectsResponse,)

    @expose("/", methods=["POST"])
    @protect()
    @safe
    @statsd_metrics
    @event_logger.log_this_with_context(
        action=lambda self, *args, **kwargs: f"{self.__class__.__name__}.post",
        log_to_statsd=False,
    )
    def post(self) -> Response:
        """Creates a new Dataset
        ---
        post:
          description: >-
            Create a new Dataset
          requestBody:
            description: Dataset schema
            required: true
            content:
              application/json:
                schema:
                  $ref: '#/components/schemas/{{self.__class__.__name__}}.post'
          responses:
            201:
              description: Dataset added
              content:
                application/json:
                  schema:
                    type: object
                    properties:
                      id:
                        type: number
                      result:
                        $ref: '#/components/schemas/{{self.__class__.__name__}}.post'
            400:
              $ref: '#/components/responses/400'
            401:
              $ref: '#/components/responses/401'
            422:
              $ref: '#/components/responses/422'
            500:
              $ref: '#/components/responses/500'
        """
        if not request.is_json:
            return self.response_400(message="Request is not JSON")
        try:
            item = self.add_model_schema.load(request.json)
        # This validates custom Schema with custom validations
        except ValidationError as error:
            return self.response_400(message=error.messages)

        try:
            new_model = CreateDatasetCommand(g.user, item).run()
            return self.response(201, id=new_model.id, result=item)
        except DatasetInvalidError as ex:
            return self.response_422(message=ex.normalized_messages())
        except DatasetCreateFailedError as ex:
            logger.error(
                "Error creating model %s: %s", self.__class__.__name__, str(ex)
            )
            return self.response_422(message=str(ex))

    @expose("/<pk>", methods=["PUT"])
    @protect()
    @safe
    @statsd_metrics
    @event_logger.log_this_with_context(
        action=lambda self, *args, **kwargs: f"{self.__class__.__name__}.put",
        log_to_statsd=False,
    )
    def put(self, pk: int) -> Response:
        """Changes a Dataset
        ---
        put:
          description: >-
            Changes a Dataset
          parameters:
          - in: path
            schema:
              type: integer
            name: pk
          - in: query
            schema:
              type: bool
            name: override_columns
          requestBody:
            description: Dataset schema
            required: true
            content:
              application/json:
                schema:
                  $ref: '#/components/schemas/{{self.__class__.__name__}}.put'
          responses:
            200:
              description: Dataset changed
              content:
                application/json:
                  schema:
                    type: object
                    properties:
                      id:
                        type: number
                      result:
                        $ref: '#/components/schemas/{{self.__class__.__name__}}.put'
            400:
              $ref: '#/components/responses/400'
            401:
              $ref: '#/components/responses/401'
            403:
              $ref: '#/components/responses/403'
            404:
              $ref: '#/components/responses/404'
            422:
              $ref: '#/components/responses/422'
            500:
              $ref: '#/components/responses/500'
        """
        override_columns = (
            bool(strtobool(request.args["override_columns"]))
            if "override_columns" in request.args
            else False
        )
        if not request.is_json:
            return self.response_400(message="Request is not JSON")
        try:
            item = self.edit_model_schema.load(request.json)
        # This validates custom Schema with custom validations
        except ValidationError as error:
            return self.response_400(message=error.messages)
        try:
            changed_model = UpdateDatasetCommand(
                g.user, pk, item, override_columns
            ).run()
            if override_columns:
                RefreshDatasetCommand(g.user, pk).run()
            response = self.response(200, id=changed_model.id, result=item)
        except DatasetNotFoundError:
            response = self.response_404()
        except DatasetForbiddenError:
            response = self.response_403()
        except DatasetInvalidError as ex:
            response = self.response_422(message=ex.normalized_messages())
        except DatasetUpdateFailedError as ex:
            logger.error(
                "Error updating model %s: %s", self.__class__.__name__, str(ex)
            )
            response = self.response_422(message=str(ex))
        return response

    @expose("/<pk>", methods=["DELETE"])
    @protect()
    @safe
    @statsd_metrics
    @event_logger.log_this_with_context(
        action=lambda self, *args, **kwargs: f"{self.__class__.__name__}.delete",
        log_to_statsd=False,
    )
    def delete(self, pk: int) -> Response:
        """Deletes a Dataset
        ---
        delete:
          description: >-
            Deletes a Dataset
          parameters:
          - in: path
            schema:
              type: integer
            name: pk
          responses:
            200:
              description: Dataset delete
              content:
                application/json:
                  schema:
                    type: object
                    properties:
                      message:
                        type: string
            401:
              $ref: '#/components/responses/401'
            403:
              $ref: '#/components/responses/403'
            404:
              $ref: '#/components/responses/404'
            422:
              $ref: '#/components/responses/422'
            500:
              $ref: '#/components/responses/500'
        """
        try:
            DeleteDatasetCommand(g.user, pk).run()
            return self.response(200, message="OK")
        except DatasetNotFoundError:
            return self.response_404()
        except DatasetForbiddenError:
            return self.response_403()
        except DatasetDeleteFailedError as ex:
            logger.error(
                "Error deleting model %s: %s", self.__class__.__name__, str(ex)
            )
            return self.response_422(message=str(ex))

    @expose("/export/", methods=["GET"])
    @protect()
    @safe
    @statsd_metrics
    @rison(get_export_ids_schema)
    @event_logger.log_this_with_context(
        action=lambda self, *args, **kwargs: f"{self.__class__.__name__}.export",
        log_to_statsd=False,
    )
    def export(self, **kwargs: Any) -> Response:
        """Export datasets
        ---
        get:
          description: >-
            Exports multiple datasets and downloads them as YAML files
          parameters:
          - in: query
            name: q
            content:
              application/json:
                schema:
                  $ref: '#/components/schemas/get_export_ids_schema'
          responses:
            200:
              description: Dataset export
              content:
                text/plain:
                  schema:
                    type: string
            400:
              $ref: '#/components/responses/400'
            401:
              $ref: '#/components/responses/401'
            404:
              $ref: '#/components/responses/404'
            500:
              $ref: '#/components/responses/500'
        """
        requested_ids = kwargs["rison"]

        if is_feature_enabled("VERSIONED_EXPORT"):
            timestamp = datetime.now().strftime("%Y%m%dT%H%M%S")
            root = f"dataset_export_{timestamp}"
            filename = f"{root}.zip"

            buf = BytesIO()
            with ZipFile(buf, "w") as bundle:
                try:
                    for file_name, file_content in ExportDatasetsCommand(
                        requested_ids
                    ).run():
                        with bundle.open(f"{root}/{file_name}", "w") as fp:
                            fp.write(file_content.encode())
                except DatasetNotFoundError:
                    return self.response_404()
            buf.seek(0)

            return send_file(
                buf,
                mimetype="application/zip",
                as_attachment=True,
                attachment_filename=filename,
            )

        query = self.datamodel.session.query(SqlaTable).filter(
            SqlaTable.id.in_(requested_ids)
        )
        query = self._base_filters.apply_all(query)
        items = query.all()
        ids = [item.id for item in items]
        if len(ids) != len(requested_ids):
            return self.response_404()

        data = [t.export_to_dict() for t in items]
        return Response(
            yaml.safe_dump(data),
            headers=generate_download_headers("yaml"),
            mimetype="application/text",
        )

    @expose("/<pk>/refresh", methods=["PUT"])
    @protect()
    @safe
    @statsd_metrics
    @event_logger.log_this_with_context(
        action=lambda self, *args, **kwargs: f"{self.__class__.__name__}" f".refresh",
        log_to_statsd=False,
    )
    def refresh(self, pk: int) -> Response:
        """Refresh a Dataset
        ---
        put:
          description: >-
            Refreshes and updates columns of a dataset
          parameters:
          - in: path
            schema:
              type: integer
            name: pk
          responses:
            200:
              description: Dataset delete
              content:
                application/json:
                  schema:
                    type: object
                    properties:
                      message:
                        type: string
            401:
              $ref: '#/components/responses/401'
            403:
              $ref: '#/components/responses/403'
            404:
              $ref: '#/components/responses/404'
            422:
              $ref: '#/components/responses/422'
            500:
              $ref: '#/components/responses/500'
        """
        try:
            RefreshDatasetCommand(g.user, pk).run()
            return self.response(200, message="OK")
        except DatasetNotFoundError:
            return self.response_404()
        except DatasetForbiddenError:
            return self.response_403()
        except DatasetRefreshFailedError as ex:
            logger.error(
                "Error refreshing dataset %s: %s", self.__class__.__name__, str(ex)
            )
            return self.response_422(message=str(ex))

    @expose("/<pk>/related_objects", methods=["GET"])
    @protect()
    @safe
    @statsd_metrics
    @event_logger.log_this_with_context(
        action=lambda self, *args, **kwargs: f"{self.__class__.__name__}"
        f".related_objects",
        log_to_statsd=False,
    )
    def related_objects(self, pk: int) -> Response:
        """Get charts and dashboards count associated to a dataset
        ---
        get:
          description:
            Get charts and dashboards count associated to a dataset
          parameters:
          - in: path
            name: pk
            schema:
              type: integer
          responses:
            200:
            200:
              description: Query result
              content:
                application/json:
                  schema:
                    $ref: "#/components/schemas/DatasetRelatedObjectsResponse"
            401:
              $ref: '#/components/responses/401'
            404:
              $ref: '#/components/responses/404'
            500:
              $ref: '#/components/responses/500'
        """
        dataset = DatasetDAO.find_by_id(pk)
        if not dataset:
            return self.response_404()
        data = DatasetDAO.get_related_objects(pk)
        charts = [
            {
                "id": chart.id,
                "slice_name": chart.slice_name,
                "viz_type": chart.viz_type,
            }
            for chart in data["charts"]
        ]
        dashboards = [
            {
                "id": dashboard.id,
                "json_metadata": dashboard.json_metadata,
                "slug": dashboard.slug,
                "title": dashboard.dashboard_title,
            }
            for dashboard in data["dashboards"]
        ]
        return self.response(
            200,
            charts={"count": len(charts), "result": charts},
            dashboards={"count": len(dashboards), "result": dashboards},
        )

    @expose("/", methods=["DELETE"])
    @protect()
    @safe
    @statsd_metrics
    @rison(get_delete_ids_schema)
    @event_logger.log_this_with_context(
        action=lambda self, *args, **kwargs: f"{self.__class__.__name__}.bulk_delete",
        log_to_statsd=False,
    )
    def bulk_delete(self, **kwargs: Any) -> Response:
        """Delete bulk Datasets
        ---
        delete:
          description: >-
            Deletes multiple Datasets in a bulk operation.
          parameters:
          - in: query
            name: q
            content:
              application/json:
                schema:
                  $ref: '#/components/schemas/get_delete_ids_schema'
          responses:
            200:
              description: Dataset bulk delete
              content:
                application/json:
                  schema:
                    type: object
                    properties:
                      message:
                        type: string
            400:
              $ref: '#/components/responses/400'
            401:
              $ref: '#/components/responses/401'
            403:
              $ref: '#/components/responses/403'
            404:
              $ref: '#/components/responses/404'
            422:
              $ref: '#/components/responses/422'
            500:
              $ref: '#/components/responses/500'
        """
        item_ids = kwargs["rison"]
        try:
            BulkDeleteDatasetCommand(g.user, item_ids).run()
            return self.response(
                200,
                message=ngettext(
                    "Deleted %(num)d dataset",
                    "Deleted %(num)d datasets",
                    num=len(item_ids),
                ),
            )
        except DatasetNotFoundError:
            return self.response_404()
        except DatasetForbiddenError:
            return self.response_403()
        except DatasetBulkDeleteFailedError as ex:
            return self.response_422(message=str(ex))

    @expose("/import/", methods=["POST"])
    @protect()
    @safe
    @statsd_metrics
    @event_logger.log_this_with_context(
        action=lambda self, *args, **kwargs: f"{self.__class__.__name__}.import_",
        log_to_statsd=False,
    )
    def import_(self) -> Response:
        """Import dataset(s) with associated databases
        ---
        post:
          requestBody:
            required: true
            content:
              multipart/form-data:
                schema:
                  type: object
                  properties:
                    formData:
                      description: upload file (ZIP or YAML)
                      type: string
                      format: binary
                    passwords:
                      description: JSON map of passwords for each file
                      type: string
                    overwrite:
                      description: overwrite existing datasets?
                      type: bool
          responses:
            200:
              description: Dataset import result
              content:
                application/json:
                  schema:
                    type: object
                    properties:
                      message:
                        type: string
            400:
              $ref: '#/components/responses/400'
            401:
              $ref: '#/components/responses/401'
            422:
              $ref: '#/components/responses/422'
            500:
              $ref: '#/components/responses/500'
        """
        upload = request.files.get("formData")
        if not upload:
            return self.response_400()
        if is_zipfile(upload):
            with ZipFile(upload) as bundle:
                contents = get_contents_from_bundle(bundle)
        else:
            upload.seek(0)
            contents = {upload.filename: upload.read()}

        passwords = (
            json.loads(request.form["passwords"])
            if "passwords" in request.form
            else None
        )
        overwrite = request.form.get("overwrite") == "true"

        command = ImportDatasetsCommand(
            contents, passwords=passwords, overwrite=overwrite
        )
        try:
            command.run()
            return self.response(200, message="OK")
        except CommandInvalidError as exc:
            logger.warning("Import dataset failed")
            return self.response_422(message=exc.normalized_messages())
        except DatasetImportError as exc:
            logger.error("Import dataset failed")
            return self.response_500(message=str(exc))