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#  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 logging
from typing import Iterable, Optional

from metadata.config.common import ConfigModel
from metadata.ingestion.api.common import WorkflowContext, Record
from metadata.ingestion.api.source import SourceStatus, Source
from ..ometa.openmetadata_rest import MetadataServerConfig
from metadata.ingestion.ometa.openmetadata_rest import OpenMetadataAPIClient
from typing import Iterable, List
from dataclasses import dataclass, field

from ...generated.schema.entity.data.dashboard import Dashboard
from ...generated.schema.entity.data.table import Table
from ...generated.schema.entity.data.topic import Topic

logger = logging.getLogger(__name__)


class MetadataTablesRestSourceConfig(ConfigModel):
    include_tables: Optional[bool] = True
    include_topics: Optional[bool] = True
    include_dashboards: Optional[bool] = True
    limit_records: int = 1000


@dataclass
class MetadataSourceStatus(SourceStatus):

    success: List[str] = field(default_factory=list)
    failures: List[str] = field(default_factory=list)
    warnings: List[str] = field(default_factory=list)

    def scanned_table(self, table_name: str) -> None:
        self.success.append(table_name)
        logger.info('Table Scanned: {}'.format(table_name))

    def scanned_topic(self, topic_name: str) -> None:
        self.success.append(topic_name)
        logger.info('Topic Scanned: {}'.format(topic_name))

    def scanned_dashboard(self, dashboard_name: str) -> None:
        self.success.append(dashboard_name)
        logger.info('Dashboard Scanned: {}'.format(dashboard_name))

    def filtered(self, table_name: str, err: str, dataset_name: str = None, col_type: str = None) -> None:
        self.warnings.append(table_name)
        logger.warning("Dropped Entity {} due to {}".format(table_name, err))

class MetadataSource(Source):
    config: MetadataTablesRestSourceConfig
    report: SourceStatus

    def __init__(self, config: MetadataTablesRestSourceConfig, metadata_config: MetadataServerConfig,
                 ctx: WorkflowContext):
        super().__init__(ctx)
        self.config = config
        self.metadata_config = metadata_config
        self.status = MetadataSourceStatus()
        self.wrote_something = False
        self.client = OpenMetadataAPIClient(self.metadata_config)
        self.tables = None
        self.topics = None

    def prepare(self):
        pass

    @classmethod
    def create(cls, config_dict: dict, metadata_config_dict: dict, ctx: WorkflowContext):
        config = MetadataTablesRestSourceConfig.parse_obj(config_dict)
        metadata_config = MetadataServerConfig.parse_obj(metadata_config_dict)
        return cls(config, metadata_config, ctx)

    def next_record(self) -> Iterable[Record]:
        yield from self.fetch_table()
        yield from self.fetch_topic()
        yield from self.fetch_dashboard()

    def fetch_table(self) -> Table:
        if self.config.include_tables:
            after = None
            while True:
                table_entities = self.client.list_tables(
                    fields="columns,tableConstraints,usageSummary,owner,database,tags,followers",
                    after=after,
                    limit=self.config.limit_records)
                for table in table_entities.tables:
                    self.status.scanned_table(table.name.__root__)
                    yield table
                if table_entities.after is None:
                    break
                after = table_entities.after

    def fetch_topic(self) -> Topic:
        if self.config.include_topics:
            after = None
            while True:
                topic_entities = self.client.list_topics(
                    fields="owner,service,tags,followers", after=after, limit=self.config.limit_records)
                for topic in topic_entities.topics:
                    self.status.scanned_topic(topic.name.__root__)
                    yield topic
                if topic_entities.after is None:
                    break
                after = topic_entities.after

    def fetch_dashboard(self) -> Dashboard:
        if self.config.include_dashboards:
            after = None
            while True:
                dashboard_entities = self.client.list_dashboards(
                    fields="owner,service,tags,followers,charts,usageSummary", after=after,
                    limit=self.config.limit_records)
                for dashboard in dashboard_entities.dashboards:
                    self.status.scanned_dashboard(dashboard.name)
                    yield dashboard
                if dashboard_entities.after is None:
                    break
                after = dashboard_entities.after

    def get_status(self) -> SourceStatus:
        return self.status

    def close(self):
        pass