"""Dispatch ingest notifications per global policy (severity → channels)."""

import logging

from sqlalchemy.orm import Session

from app.models import Event, Problem
from app.services import email_notify, mobile_notify, telegram_notify, webhook_notify
from app.services.notification_cooldown import should_notify_event, should_notify_problem
from app.services.notification_policy import get_effective_notification_policy
from app.services.event_type_visibility import event_type_notifications_enabled
from app.services.host_health import HEARTBEAT_TYPE
from app.services.notification_severity import severity_meets_minimum

logger = logging.getLogger(__name__)

LIFECYCLE_EVENT_TYPE = "agent.lifecycle"
DAILY_REPORT_EVENT_TYPES = frozenset({"report.daily.ssh", "report.daily.rdp"})
AUTH_LOGIN_SUCCESS_TYPES = frozenset({"rdp.login.success", "ssh.login.success"})
RDG_CONNECTION_TYPES = frozenset({
    "rdg.connection.success",
    "rdg.connection.disconnected",
    "rdg.connection.failed",
})


def _event_telegram_via_agent(event: Event) -> bool:
    details = event.details if isinstance(event.details, dict) else {}
    via = str(details.get("telegram_via") or "").strip().lower()
    return via == "agent"


def _skip_notifications_for_hidden_event(event: Event, db: Session | None) -> bool:
    if event_type_notifications_enabled(event.type, db):
        return False
    logger.info(
        "notify skipped hidden event type=%s event_id=%s",
        event.type,
        event.event_id,
    )
    return True


def _dispatch_event_channels(event: Event, *, db: Session | None, policy) -> None:
    if policy.use_telegram:
        telegram_notify.notify_event(event, db=db, apply_policy_gate=False)
    if policy.use_webhook:
        webhook_notify.notify_event(event, db=db, apply_policy_gate=False)
    if policy.use_email:
        email_notify.notify_event(event, db=db, apply_policy_gate=False)
    if policy.use_mobile:
        mobile_notify.notify_event(event, db=db, apply_policy_gate=False)


def _dispatch_problem_channels(problem: Problem, event: Event | None, *, db: Session | None, policy) -> None:
    if policy.use_telegram:
        telegram_notify.notify_problem(problem, event, db=db, apply_policy_gate=False)
    if policy.use_webhook:
        webhook_notify.notify_problem(problem, event, db=db, apply_policy_gate=False)
    if policy.use_email:
        email_notify.notify_problem(problem, event, db=db, apply_policy_gate=False)
    if policy.use_mobile:
        mobile_notify.notify_problem(problem, event, db=db, apply_policy_gate=False)


def notify_event(event: Event, *, db: Session | None = None) -> None:
    # Heartbeat — только для UI/статуса хоста, не для Telegram/email/push.
    if event.type == HEARTBEAT_TYPE:
        return
    if _skip_notifications_for_hidden_event(event, db):
        return
    policy = get_effective_notification_policy(db)
    if not severity_meets_minimum(event.severity, policy.min_severity):
        return
    if not should_notify_event(event, db):
        return
    _dispatch_event_channels(event, db=db, policy=policy)


def notify_problem(problem: Problem, event: Event | None = None, *, db: Session | None = None) -> None:
    policy = get_effective_notification_policy(db)
    if not severity_meets_minimum(problem.severity, policy.min_severity):
        return
    if not should_notify_problem(problem, db):
        return
    _dispatch_problem_channels(problem, event, db=db, policy=policy)


def _dispatch_lifecycle_channels(event: Event, *, db: Session | None, policy) -> None:
    skip_telegram = _event_telegram_via_agent(event)
    if policy.use_telegram and not skip_telegram:
        telegram_notify.notify_event(event, db=db, apply_policy_gate=False)
    if policy.use_webhook:
        webhook_notify.notify_event(event, db=db, apply_policy_gate=False)
    if policy.use_email:
        email_notify.notify_event(event, db=db, apply_policy_gate=False)
    if policy.use_mobile:
        mobile_notify.notify_event(event, db=db, apply_policy_gate=False)


def notify_daily_report(event: Event, *, db: Session | None = None) -> None:
    """Оповещение по суточному отчёту (severity=info, вне порога policy).

    При UseSAC=dual агент шлёт TG сам (telegram_via=agent) — SAC не дублирует.
    """
    if _skip_notifications_for_hidden_event(event, db):
        return
    policy = get_effective_notification_policy(db)
    if not should_notify_event(event, db):
        return
    _dispatch_lifecycle_channels(event, db=db, policy=policy)


def notify_lifecycle(event: Event, *, db: Session | None = None) -> None:
    """Старт/стоп/reload агента — всегда в каналы SAC (кроме TG, если telegram_via=agent)."""
    if _skip_notifications_for_hidden_event(event, db):
        return
    policy = get_effective_notification_policy(db)
    if not should_notify_event(event, db):
        return
    _dispatch_lifecycle_channels(event, db=db, policy=policy)


def notify_auth_login(event: Event, *, db: Session | None = None) -> None:
    """Успешный удалённый вход RDP/SSH — всегда в Telegram SAC (info вне min_severity).

    При UseSAC=dual агент шлёт TG сам (telegram_via=agent) — SAC не дублирует.
    """
    if _skip_notifications_for_hidden_event(event, db):
        return
    policy = get_effective_notification_policy(db)
    if not should_notify_event(event, db):
        return
    _dispatch_lifecycle_channels(event, db=db, policy=policy)


def notify_rdg_connection(event: Event, *, db: Session | None = None) -> None:
    """RD Gateway 302/303 — ingest всегда; Telegram SAC вне min_severity (как auth login)."""
    if _skip_notifications_for_hidden_event(event, db):
        return
    policy = get_effective_notification_policy(db)
    if not should_notify_event(event, db):
        return
    _dispatch_lifecycle_channels(event, db=db, policy=policy)