import { getTranslations } from "next-intl/server";
import { Bell } from "lucide-react";
import { sendHotelAlert } from "@/actions/admin-alerts";
import { StatusCard } from "@/components/admin/dashboard";
import { prisma } from "@/lib/prisma";

export const dynamic = "force-dynamic";

const CRITICAL = new Set(["critical", "error", "danger"]);
const WARNING = new Set(["warning", "warn"]);

function fromDate(d: Date | null | undefined): string {
  return d ? d.toISOString().slice(0, 16).replace("T", " ") : "—";
}

function severityColor(severity: string): string {
  switch (severity.toLowerCase()) {
    case "critical":
    case "error":
    case "danger":
      return "var(--color-danger)";
    case "warning":
    case "warn":
      return "var(--color-primary)";
    case "success":
      return "var(--color-secondary)";
    case "info":
    case "notice":
      return "var(--color-accent)";
    default:
      return "var(--color-text-muted)";
  }
}

function Badge({ label, color }: { label: string; color: string }) {
  return (
    <span
      style={{
        display: "inline-block",
        padding: "0.1rem 0.55rem",
        borderRadius: "999px",
        background: color,
        color: "#fff",
        fontSize: "0.72rem",
        fontWeight: 700,
        letterSpacing: "0.02em",
        textTransform: "uppercase",
        whiteSpace: "nowrap",
      }}
    >
      {label}
    </span>
  );
}

export default async function AdminAlerts() {
  const t = await getTranslations("pages.admin.alerts");

  let alerts: Awaited<ReturnType<typeof prisma.alertLogs.findMany>>;
  try {
    alerts = await prisma.alertLogs.findMany({
      orderBy: { id: "desc" },
      take: 100,
    });
  } catch {
    alerts = [];
  }

  const critical = alerts.filter((a) => CRITICAL.has((a.severity || "").toLowerCase())).length;
  const warnings = alerts.filter((a) => WARNING.has((a.severity || "").toLowerCase())).length;
  const unread = alerts.filter((a) => !a.isRead).length;

  return (
    <main>
      <div className="flex items-center gap-3 mb-6">
        <div className="w-10 h-10 rounded-xl bg-gradient-to-br from-[var(--color-primary)]/20 to-[var(--color-primary)]/5 grid place-items-center">
          <Bell size={20} className="text-[var(--color-primary)]" />
        </div>
        <div>
          <h1 className="m-0 text-xl font-extrabold text-[var(--color-text)]">{t("title")}</h1>
          <p className="m-0 text-xs text-[var(--color-text-muted)] mt-0.5">{t("subtitle")}</p>
        </div>
      </div>

      <div className="grid grid-cols-[repeat(auto-fit,minmax(180px,1fr))] gap-3.5 mb-6">
        <StatusCard label={t("alertsShown")} value={alerts.length} icon="🔔" />
        <StatusCard
          label={t("critical")}
          value={critical}
          state={critical > 0 ? "danger" : "ok"}
          icon="🚨"
        />
        <StatusCard
          label={t("warnings")}
          value={warnings}
          state={warnings > 0 ? "warn" : "neutral"}
          icon="⚠️"
        />
        <StatusCard
          label={t("unread")}
          value={unread}
          state={unread > 0 ? "warn" : "ok"}
          icon="📨"
        />
      </div>

      <form action={sendHotelAlert} className="admin-card mb-6">
        <h3 className="mt-0">{t("form.send")}</h3>
        <p className="text-xs text-gray-500 dark:text-gray-400">
          {t.rich("form.description", {
            code: (chunks) => <code>{chunks}</code>,
          })}
        </p>
        <div className="flex gap-2 flex-wrap items-start">
          <textarea
            name="message"
            required
            maxLength={1000}
            rows={2}
            placeholder={t("form.messagePlaceholder")}
            className="flex-1 min-w-[240px]"
          />
          <button type="submit" className="btn btn-primary">
            {t("form.send")}
          </button>
        </div>
      </form>

      <section className="admin-card">
        <h3 className="mt-0">{t("recentAlerts", { count: alerts.length })}</h3>
        {alerts.length === 0 ? (
          <div className="admin-empty">{t("noAlerts")}</div>
        ) : (
          <div className="overflow-x-auto">
            <table>
              <thead>
                <tr>
                  <th>{t("colWhen")}</th>
                  <th>{t("colSeverity")}</th>
                  <th>{t("colType")}</th>
                  <th>{t("colMessage")}</th>
                </tr>
              </thead>
              <tbody>
                {alerts.map((a) => (
                  <tr key={String(a.id)}>
                    <td className="text-sm text-gray-500 dark:text-gray-400 whitespace-nowrap">
                      {fromDate(a.createdAt)}
                    </td>
                    <td>
                      <Badge label={a.severity || "—"} color={severityColor(a.severity)} />
                    </td>
                    <td>
                      <Badge label={a.type || "—"} color="var(--color-text-muted)" />
                    </td>
                    <td>{a.message}</td>
                  </tr>
                ))}
              </tbody>
            </table>
          </div>
        )}
      </section>
    </main>
  );
}