"""
©AngelaMos | 2026
alert_ctrl.py
"""

from typing import Any

from flask import Response, g

from app.config import settings
from app.core.streaming import sse_generator
from app.models.Alert import Alert


def list_alerts() -> dict[str, Any]:
    """
    Return paginated and filtered alerts
    """
    params = g.validated
    filters = {}
    if params.status:
        filters["status"] = params.status
    if params.severity:
        filters["severity"] = params.severity

    qs = Alert.objects(**filters).order_by("-created_at")
    return Alert.paginate(
        queryset=qs,
        page=params.page,
        per_page=params.per_page,
    )


def get_alert_detail(alert_id: str) -> dict[str, Any]:
    """
    Return an alert with its matched log events
    """
    alert = Alert.get_by_id(alert_id)
    return alert.get_with_events()


def update_alert_status(alert_id: str) -> Alert:
    """
    Transition an alert to a new lifecycle status
    """
    data = g.validated
    alert = Alert.get_by_id(alert_id)
    username = None
    if g.current_user:
        username = g.current_user.username
    alert.update_status(
        status=data.status,
        username=username,
        notes=data.notes,
    )
    return alert


def stream_alerts() -> Response:
    """
    SSE endpoint that tails the alert Redis Stream
    """
    return Response(
        sse_generator(settings.ALERT_STREAM_KEY, event_type="alert"),
        mimetype="text/event-stream",
        headers={
            "Cache-Control": "no-cache",
            "X-Accel-Buffering": "no",
        },
    )