"""All queries for logbook."""
from __future__ import annotations

from datetime import datetime as dt

from sqlalchemy import lambda_stmt
from sqlalchemy.orm import Query
from sqlalchemy.sql.elements import ClauseList
from sqlalchemy.sql.lambdas import StatementLambdaElement

from homeassistant.components.recorder.db_schema import (
    LAST_UPDATED_INDEX,
    Events,
    States,
)

from .common import (
    apply_states_filters,
    legacy_select_events_context_id,
    select_events_without_states,
    select_states,
)


def all_stmt(
    start_day: dt,
    end_day: dt,
    event_types: tuple[str, ...],
    states_entity_filter: ClauseList | None = None,
    events_entity_filter: ClauseList | None = None,
    context_id: str | None = None,
) -> StatementLambdaElement:
    """Generate a logbook query for all entities."""
    stmt = lambda_stmt(
        lambda: select_events_without_states(start_day, end_day, event_types)
    )
    if context_id is not None:
        # Once all the old `state_changed` events
        # are gone from the database remove the
        # _legacy_select_events_context_id()
        stmt += lambda s: s.where(Events.context_id == context_id).union_all(
            _states_query_for_context_id(start_day, end_day, context_id),
            legacy_select_events_context_id(start_day, end_day, context_id),
        )
    else:
        if events_entity_filter is not None:
            stmt += lambda s: s.where(events_entity_filter)

        if states_entity_filter is not None:
            stmt += lambda s: s.union_all(
                _states_query_for_all(start_day, end_day).where(states_entity_filter)
            )
        else:
            stmt += lambda s: s.union_all(_states_query_for_all(start_day, end_day))

    stmt += lambda s: s.order_by(Events.time_fired)
    return stmt


def _states_query_for_all(start_day: dt, end_day: dt) -> Query:
    return apply_states_filters(_apply_all_hints(select_states()), start_day, end_day)


def _apply_all_hints(query: Query) -> Query:
    """Force mysql to use the right index on large selects."""
    return query.with_hint(
        States, f"FORCE INDEX ({LAST_UPDATED_INDEX})", dialect_name="mysql"
    )


def _states_query_for_context_id(start_day: dt, end_day: dt, context_id: str) -> Query:
    return apply_states_filters(select_states(), start_day, end_day).where(
        States.context_id == context_id
    )