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# coding=utf-8
#
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2023 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT

import datetime

import sqlalchemy as sa

from lvestats.orm import bursting_events_table


class TableDoesNotExistError(Exception):

    def __init__(self, table_name):
        self.message = f'Table "{table_name}" does not exist in the database'
        super().__init__(self.message)


class HistoryShowBursting:

    def __init__(self,
                 dbengine: sa.engine.base.Engine,
                 period_from: datetime.datetime,
                 period_to: datetime.datetime,
                 uid: int | None = None,
                 server_id: str = 'localhost') -> None:
        self.dbengine = dbengine
        self.period_from = period_from
        self.period_to = period_to
        self.uid = uid
        self.server_id = server_id

    def get(self) -> list[sa.engine.RowProxy]:
        """
        Get history from the 'bursting_events' table.

        Retrieving records within the required time frame,
        along with one record preceding this time frame
        to detect the bursting status at the start of the time frame.
        """
        # Since bursting limits functionality isn't enabled by default,
        # we need to check if the table exists first
        inspector = sa.inspect(self.dbengine)
        if bursting_events_table.name not in inspector.get_table_names():
            raise TableDoesNotExistError(bursting_events_table.name)

        ts_from = self.period_from.timestamp()
        ts_to = self.period_to.timestamp()

        # Get the rows with timestamp between ts_from and ts_to
        stmt1 = sa.select([
            bursting_events_table.c.lve_id,
            bursting_events_table.c.timestamp,
            bursting_events_table.c.event_type,
        ]).where(
            sa.and_(
                bursting_events_table.c.server_id == self.server_id,
                bursting_events_table.c.timestamp >= ts_from,
                bursting_events_table.c.timestamp <= ts_to,
                # Add lve_id condition if it's specified
                (bursting_events_table.c.lve_id == self.uid) if self.uid is not None else True,
            )
        )

        # Subquery to get the maximum timestamp for each lve_id where timestamp < ts_from
        subquery = sa.select([
            bursting_events_table.c.lve_id,
            sa.func.max(bursting_events_table.c.timestamp).label('max_timestamp'),
        ]).where(
            sa.and_(
                bursting_events_table.c.server_id == self.server_id,
                bursting_events_table.c.timestamp < ts_from,
                # Add lve_id condition if it's specified
                (bursting_events_table.c.lve_id == self.uid) if self.uid is not None else True,
            )
        ).group_by(
            bursting_events_table.c.lve_id,
        ).alias('subquery')

        # Get the row with the maximum timestamp less than ts_from
        stmt2 = sa.select([
            bursting_events_table.c.lve_id,
            bursting_events_table.c.timestamp,
            bursting_events_table.c.event_type,
        ]).select_from(
            bursting_events_table.join(
                subquery,
                sa.and_(
                    bursting_events_table.c.lve_id == subquery.c.lve_id,
                    bursting_events_table.c.timestamp == subquery.c.max_timestamp,
                )
            )
        )

        stmt = sa.union(
            stmt1,
            stmt2,
        )

        stmt = stmt.order_by(
            stmt.c.lve_id,
            stmt.c.timestamp,
        )

        with self.dbengine.connect() as connection:
            result = connection.execute(stmt).fetchall()
        return result

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