import { useEffect, useRef } from "react";
import { dismissMapNotice, showMapNotice } from "@/features/map/core";
import type { WorkbenchAlert } from "../types";

import { useScadaEventAtmosphere, type ScadaEventTask } from "./use-scada-event-atmosphere";
export type { ScadaAlertAtmosphereState } from "./use-scada-event-atmosphere";

/** Announce newly persisted alerts, including while the peripheral panel is closed. */
export function useScadaAlertNotices(
  projectId: string | null,
  alerts: WorkbenchAlert[] | null,
  onOpen: (alert: WorkbenchAlert) => void,
  tasks: readonly ScadaEventTask[] | null = null
) {
  const atmosphere = useScadaEventAtmosphere(projectId, alerts, tasks);
  const openRef = useRef(onOpen);
  openRef.current = onOpen;
  const state = useRef<{ initialized: boolean; seen: Set<string>; visible: Set<string>; linked: Set<string> }>({
    initialized: false, seen: new Set(), visible: new Set(), linked: new Set()
  });

  useEffect(() => {
    const current = { initialized: false, seen: new Set<string>(), visible: new Set<string>(), linked: new Set<string>() };
    state.current = current;
    return () => { current.visible.forEach((id) => dismissMapNotice(id)); };
  }, [projectId]);

  useEffect(() => {
    if (!alerts) return;
    const current = state.current;
    const incoming = alerts.filter((alert) => alert.source && "kind" in alert.source
      && alert.source.kind === "scada_replay");
    const noticeId = (id: string) => `scada-alert:${projectId}:${id}`;
    const activeIds = new Set(incoming.map((alert) => noticeId(alert.id)));
    for (const id of current.visible) {
      if (!activeIds.has(id) && !current.linked.has(id)) {
        dismissMapNotice(id);
        current.visible.delete(id);
      }
    }
    for (const alert of incoming) {
      if (current.seen.has(alert.id)) continue;
      current.seen.add(alert.id);
      // Opening a project restores its notification center without replaying old popups.
      if (!current.initialized) continue;
      const id = noticeId(alert.id);
      current.visible.add(id);
      if (alert.conditionId) current.linked.add(id);
      showMapNotice({
        id,
        title: alert.title,
        message: alert.description,
        tone: alert.severity === "critical" ? "error" : "warning",
        position: "top-center",
        duration: alert.conditionId ? Infinity : 10_000,
        actionLabel: alert.conditionId ? "查看调查" : undefined,
        onAction: alert.conditionId ? () => openRef.current(alert) : undefined
      });
    }
    current.initialized = true;
  }, [alerts, projectId]);

  return atmosphere;
}