"use client";

import { useActionState } from "react";
import { Mail } from "lucide-react";
import { Button } from "@/components/ui/button";
import { Pill } from "@/components/mockup-ui";
import { sendTestMail, type TestMailState } from "@/server/actions/mail";

/**
 * SEC1 §9 — Betriebsanzeige der Mail-Strecke + Testversand.
 *
 * Der Testversand geht immer an die eigene Adresse des angemeldeten
 * Plattform-Admins (siehe src/server/actions/mail.ts) — deshalb gibt es hier
 * bewusst kein Empfängerfeld.
 */

type MailStatus = {
  configured: boolean;
  reason?: string;
  host?: string;
  from?: string;
  queue: "bullmq" | "inline";
  recent: {
    id: string;
    to: string;
    template: string;
    status: string;
    error: string | null;
    createdAt: Date;
  }[];
};

const STATUS_TONE: Record<string, "ok" | "warn" | "risk" | "mut"> = {
  sent: "ok",
  pending: "warn",
  failed: "risk",
  bounced: "risk",
  suppressed: "mut",
};

export function MailStatusPanel({ status }: { status: MailStatus }) {
  const [state, action, pending] = useActionState<TestMailState, FormData>(
    async () => sendTestMail(),
    { status: "idle" },
  );

  return (
    <div className="shadow-card mt-5 rounded-xl border bg-card p-5">
      <div className="flex flex-wrap items-center justify-between gap-3">
        <div>
          <p className="font-heading text-sm font-semibold">E-Mail-Versand</p>
          <p className="mt-0.5 text-[12px] text-muted-foreground">
            {status.configured
              ? `SMTP ${status.host} · Absender ${status.from} · ${
                  status.queue === "bullmq"
                    ? "asynchron über die Queue (Worker)"
                    : "inline (kein Redis konfiguriert — kein Retry)"
                }`
              : (status.reason ?? "SMTP ist nicht konfiguriert.")}
          </p>
        </div>
        <div className="flex items-center gap-3">
          <Pill tone={status.configured ? "ok" : "warn"}>
            {status.configured ? "Konfiguriert" : "Nicht konfiguriert"}
          </Pill>
          <form action={action}>
            <Button type="submit" variant="outline" size="sm" disabled={!status.configured || pending}>
              <Mail className="size-4" /> {pending ? "Sende…" : "Test-Mail senden"}
            </Button>
          </form>
        </div>
      </div>

      {state.status !== "idle" && (
        <p
          role="status"
          className={`mt-3 rounded-lg px-3 py-2 text-[13px] ${
            state.status === "ok"
              ? "bg-[rgba(57,192,127,0.14)] text-[var(--ok)]"
              : "bg-[rgba(255,107,107,0.16)] text-[var(--risk)]"
          }`}
        >
          {state.message}
        </p>
      )}

      {status.recent.length > 0 && (
        <div className="mt-4 overflow-x-auto">
          <table className="w-full text-[12.5px]">
            <thead className="text-muted-foreground">
              <tr className="text-left">
                <th className="py-1.5 pr-3 font-semibold">Zeitpunkt</th>
                <th className="py-1.5 pr-3 font-semibold">Empfänger</th>
                <th className="py-1.5 pr-3 font-semibold">Template</th>
                <th className="py-1.5 pr-3 font-semibold">Status</th>
              </tr>
            </thead>
            <tbody>
              {status.recent.map((row) => (
                <tr key={row.id} className="border-t border-[var(--panel-brd)]">
                  <td className="py-1.5 pr-3 whitespace-nowrap">
                    {new Intl.DateTimeFormat("de-DE", {
                      dateStyle: "short",
                      timeStyle: "short",
                    }).format(new Date(row.createdAt))}
                  </td>
                  <td className="py-1.5 pr-3">{row.to}</td>
                  <td className="py-1.5 pr-3 font-mono text-[11.5px]">{row.template}</td>
                  <td className="py-1.5 pr-3">
                    <Pill tone={STATUS_TONE[row.status] ?? "mut"}>{row.status}</Pill>
                    {row.error && (
                      <span className="ml-2 text-[11px] text-muted-foreground" title={row.error}>
                        {row.error.slice(0, 60)}
                        {row.error.length > 60 ? "…" : ""}
                      </span>
                    )}
                  </td>
                </tr>
              ))}
            </tbody>
          </table>
        </div>
      )}
    </div>
  );
}