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# to you under the Apache License, Version 2.0 (the
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# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
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import logging
from typing import Any, Dict, List, Optional

from flask import current_app
from sqlalchemy.exc import SQLAlchemyError

from superset.connectors.sqla.models import SqlaTable, SqlMetric, TableColumn
from superset.dao.base import BaseDAO
from superset.extensions import db
from superset.models.core import Database
from superset.views.base import DatasourceFilter

logger = logging.getLogger(__name__)


class DatasetDAO(BaseDAO):
    model_cls = SqlaTable
    base_filter = DatasourceFilter

    @staticmethod
    def get_owner_by_id(owner_id: int) -> Optional[object]:
        return (
            db.session.query(current_app.appbuilder.sm.user_model)
            .filter_by(id=owner_id)
            .one_or_none()
        )

    @staticmethod
    def get_database_by_id(database_id: int) -> Optional[Database]:
        try:
            return db.session.query(Database).filter_by(id=database_id).one_or_none()
        except SQLAlchemyError as ex:  # pragma: no cover
            logger.error("Could not get database by id: %s", str(ex))
            return None

    @staticmethod
    def validate_table_exists(database: Database, table_name: str, schema: str) -> bool:
        try:
            database.get_table(table_name, schema=schema)
            return True
        except SQLAlchemyError as ex:  # pragma: no cover
            logger.error("Got an error %s validating table: %s", str(ex), table_name)
            return False

    @staticmethod
    def validate_uniqueness(database_id: int, name: str) -> bool:
        dataset_query = db.session.query(SqlaTable).filter(
            SqlaTable.table_name == name, SqlaTable.database_id == database_id
        )
        return not db.session.query(dataset_query.exists()).scalar()

    @staticmethod
    def validate_update_uniqueness(
        database_id: int, dataset_id: int, name: str
    ) -> bool:
        dataset_query = db.session.query(SqlaTable).filter(
            SqlaTable.table_name == name,
            SqlaTable.database_id == database_id,
            SqlaTable.id != dataset_id,
        )
        return not db.session.query(dataset_query.exists()).scalar()

    @staticmethod
    def validate_columns_exist(dataset_id: int, columns_ids: List[int]) -> bool:
        dataset_query = (
            db.session.query(TableColumn.id).filter(
                TableColumn.table_id == dataset_id, TableColumn.id.in_(columns_ids)
            )
        ).all()
        return len(columns_ids) == len(dataset_query)

    @staticmethod
    def validate_columns_uniqueness(dataset_id: int, columns_names: List[str]) -> bool:
        dataset_query = (
            db.session.query(TableColumn.id).filter(
                TableColumn.table_id == dataset_id,
                TableColumn.column_name.in_(columns_names),
            )
        ).all()
        return len(dataset_query) == 0

    @staticmethod
    def validate_metrics_exist(dataset_id: int, metrics_ids: List[int]) -> bool:
        dataset_query = (
            db.session.query(SqlMetric.id).filter(
                SqlMetric.table_id == dataset_id, SqlMetric.id.in_(metrics_ids)
            )
        ).all()
        return len(metrics_ids) == len(dataset_query)

    @staticmethod
    def validate_metrics_uniqueness(dataset_id: int, metrics_names: List[str]) -> bool:
        dataset_query = (
            db.session.query(SqlMetric.id).filter(
                SqlMetric.table_id == dataset_id,
                SqlMetric.metric_name.in_(metrics_names),
            )
        ).all()
        return len(dataset_query) == 0

    @classmethod
    def update(
        cls, model: SqlaTable, properties: Dict[str, Any], commit: bool = True
    ) -> Optional[SqlaTable]:
        """
        Updates a Dataset model on the metadata DB
        """
        if "columns" in properties:
            new_columns = list()
            for column in properties.get("columns", []):
                if column.get("id"):
                    column_obj = db.session.query(TableColumn).get(column.get("id"))
                    column_obj = DatasetDAO.update_column(
                        column_obj, column, commit=commit
                    )
                else:
                    column_obj = DatasetDAO.create_column(column, commit=commit)
                new_columns.append(column_obj)
            properties["columns"] = new_columns

        if "metrics" in properties:
            new_metrics = list()
            for metric in properties.get("metrics", []):
                if metric.get("id"):
                    metric_obj = db.session.query(SqlMetric).get(metric.get("id"))
                    metric_obj = DatasetDAO.update_metric(
                        metric_obj, metric, commit=commit
                    )
                else:
                    metric_obj = DatasetDAO.create_metric(metric, commit=commit)
                new_metrics.append(metric_obj)
            properties["metrics"] = new_metrics

        return super().update(model, properties, commit=commit)

    @classmethod
    def update_column(
        cls, model: TableColumn, properties: Dict[str, Any], commit: bool = True
    ) -> Optional[TableColumn]:
        return DatasetColumnDAO.update(model, properties, commit=commit)

    @classmethod
    def create_column(
        cls, properties: Dict[str, Any], commit: bool = True
    ) -> Optional[TableColumn]:
        """
        Creates a Dataset model on the metadata DB
        """
        return DatasetColumnDAO.create(properties, commit=commit)

    @classmethod
    def update_metric(
        cls, model: SqlMetric, properties: Dict[str, Any], commit: bool = True
    ) -> Optional[SqlMetric]:
        return DatasetMetricDAO.update(model, properties, commit=commit)

    @classmethod
    def create_metric(
        cls, properties: Dict[str, Any], commit: bool = True
    ) -> Optional[SqlMetric]:
        """
        Creates a Dataset model on the metadata DB
        """
        return DatasetMetricDAO.create(properties, commit=commit)


class DatasetColumnDAO(BaseDAO):
    model_cls = TableColumn


class DatasetMetricDAO(BaseDAO):
    model_cls = SqlMetric