'use client';

import Link from 'next/link';
import { useTranslations } from 'next-intl';
import { useEffect, useMemo, useState } from 'react';
import type { WidgetProps } from '@/components/dashboard/widget-registry';
import { HealthBar } from '@/components/proxmox/HealthBar';
import { summarizeHealth } from '@/components/proxmox/proxmox-status';
import { HEALTH_STYLE } from '@/components/proxmox/status-styles';
// T-I8V-02: aus dem Proxmox-Klienten NUR die Leseabfrage des Zwischenlagers.
// Die manuelle Abfrage (POST .../poll) gehoert der Modulseite und darf hier
// nie auftauchen — sonst loeste jede Kachel je Benutzer Live-Abfragen aus.
import { listServers, type ProxmoxServer } from '@/lib/proxmox-api';
import { useAuthStore } from '@/lib/stores/auth-store';
import { healthSummary } from './proxmox-widget-model';

/**
 * ProxmoxWidget (quick-260924-i8v) — die erste Modul-Kachel. Zeigt den
 * Zustand der Proxmox-Server in der Statussprache der Modulseite: kompakter
 * Gesundheitsbalken und darunter die Zusammenfassung in Worten.
 *
 * Liest ausschliesslich das Zwischenlager (`GET /modules/proxmox/servers`),
 * das `@UseModule('proxmox')` serverseitig schuetzt.
 */
export function ProxmoxWidget({ isEditMode }: WidgetProps) {
  const t = useTranslations('widgets');
  const tp = useTranslations('proxmox');
  const user = useAuthStore((s) => s.user);
  const isAdmin = user?.role === 'ADMIN' || user?.role === 'SUPER_ADMIN';

  const [servers, setServers] = useState<ProxmoxServer[] | null>(null);
  // Fehler als Flag, nicht als Text: `t` gehoert nicht in die Effekt-
  // Abhaengigkeiten (Befund 14 aus favorites-widget).
  const [loadFailed, setLoadFailed] = useState(false);
  const [now, setNow] = useState(() => Date.now());

  useEffect(() => {
    let cancelled = false;
    listServers()
      .then((list) => {
        if (cancelled) return;
        setServers(list);
        setLoadFailed(false);
        setNow(Date.now());
      })
      .catch(() => {
        if (!cancelled) setLoadFailed(true);
      });
    return () => {
      cancelled = true;
    };
  }, []);

  const counts = useMemo(() => summarizeHealth(servers ?? [], now), [servers, now]);
  const summary = useMemo(() => healthSummary(counts), [counts]);

  if (servers === null && loadFailed) {
    return (
      <div className="flex h-full items-center justify-center p-2.5">
        <p className="text-center text-sm text-muted-foreground">{tp('loadError')}</p>
      </div>
    );
  }

  if (servers === null) {
    return (
      <div className="flex h-full flex-col overflow-hidden p-2.5" aria-busy="true">
        <div className="h-1.5 w-full shrink-0 animate-pulse rounded-full bg-muted motion-reduce:animate-none" />
        <span className="sr-only">{tp('loading')}</span>
      </div>
    );
  }

  if (servers.length === 0) {
    return (
      <div className="flex h-full flex-col items-center justify-center gap-1.5 p-2.5 text-center">
        <p className="text-sm text-muted-foreground">{t('proxmox.empty')}</p>
        {isAdmin &&
          (isEditMode ? (
            <span className="text-sm font-medium text-foreground">{tp('card.settingsLink')}</span>
          ) : (
            <Link
              href="/modules/proxmox/settings"
              className="rounded-sm text-sm font-medium text-foreground hover:underline focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring"
            >
              {tp('card.settingsLink')}
            </Link>
          ))}
      </div>
    );
  }

  const summaryText = summary.allOk
    ? t('proxmox.allOk')
    : summary.entries
        .map((e) => `${e.count} ${tp(`legend.${e.health}`, { count: e.count })}`)
        .join(', ');
  const summaryColor = summary.allOk
    ? HEALTH_STYLE.ok.text
    : summary.worst
      ? HEALTH_STYLE[summary.worst].text
      : 'text-muted-foreground';

  return (
    <div className="flex h-full flex-col gap-2 overflow-hidden p-2.5">
      <HealthBar variant="compact" counts={counts} />
      <p
        className={`truncate text-sm font-medium ${summaryColor}`}
        title={summaryText}
        data-testid="proxmox-summary"
      >
        {summaryText}
      </p>
    </div>
  );
}