"use client";

import { useEffect, useState } from "react";

type Status = {
  smtp: { host: string; port: number; user: string; from: string; passGesetzt: boolean };
  telegram: { botTokenGesetzt: boolean };
  logo: { secretGesetzt: boolean; publishableKey: string };
  verschluesselungBereit: boolean;
};

const inputClass =
  "mt-1.5 h-11 w-full rounded-field border border-line bg-white px-3.5 text-sm text-ink placeholder:text-muted/60";

async function saveSection(section: string, values: Record<string, string>) {
  const res = await fetch("/api/settings/integrations", {
    method: "POST",
    headers: { "content-type": "application/json" },
    body: JSON.stringify({ section, values }),
  });
  const data = await res.json().catch(() => ({}));
  if (!res.ok) throw new Error(data.message ?? `Fehler: ${(data.errors ?? []).join(", ")}`);
  return data.status as Status;
}

function Section({
  title,
  children,
}: {
  title: string;
  children: React.ReactNode;
}) {
  return (
    <section className="rounded-card border border-line bg-white p-5">
      <h2 className="text-[15px] font-semibold tracking-tight">{title}</h2>
      <div className="mt-3">{children}</div>
    </section>
  );
}

function SecretHint({ gesetzt }: { gesetzt: boolean }) {
  return (
    <p className="mt-1 text-[13px] text-muted">
      {gesetzt ? "Gespeichert. Leer lassen, um den Wert zu behalten." : "Noch nicht gespeichert."}
    </p>
  );
}

export default function IntegrationsForm() {
  const [status, setStatus] = useState<Status | null>(null);
  const [loadError, setLoadError] = useState("");
  const [notice, setNotice] = useState("");
  const [smtp, setSmtp] = useState({ host: "", port: "587", user: "", pass: "", from: "" });
  const [telegramToken, setTelegramToken] = useState("");
  const [logoSecret, setLogoSecret] = useState("");
  const [logoPublic, setLogoPublic] = useState("");

  useEffect(() => {
    fetch("/api/settings/integrations")
      .then((r) => (r.ok ? r.json() : Promise.reject(new Error("laden fehlgeschlagen"))))
      .then((s: Status) => {
        setStatus(s);
        setSmtp({ host: s.smtp.host, port: String(s.smtp.port), user: s.smtp.user, pass: "", from: s.smtp.from });
        setLogoPublic(s.logo.publishableKey);
      })
      .catch(() => setLoadError("Einstellungen konnten nicht geladen werden."));
  }, []);

  async function onSave(section: "smtp" | "telegram" | "logo", values: Record<string, string>, okText: string) {
    setNotice("");
    try {
      const s = await saveSection(section, values);
      setStatus(s);
      if (section === "smtp") setSmtp((v) => ({ ...v, pass: "" }));
      if (section === "telegram") setTelegramToken("");
      if (section === "logo") {
        setLogoSecret("");
        setLogoPublic(s.logo.publishableKey);
      }
      setNotice(okText);
    } catch (e) {
      setNotice(e instanceof Error ? e.message : "Speichern fehlgeschlagen");
    }
  }

  if (loadError) return <p role="alert" className="text-sm font-medium text-danger">{loadError}</p>;
  if (!status) return <p className="text-sm text-muted">Wird geladen …</p>;

  return (
    <div className="grid gap-4">
      <Section title="E-Mail (SMTP)">
        <div className="grid gap-4 sm:grid-cols-2">
          <div className="sm:col-span-2">
            <label htmlFor="smtp-host" className="block text-[13px] font-semibold">Server</label>
            <input id="smtp-host" value={smtp.host} onChange={(e) => setSmtp({ ...smtp, host: e.target.value })} placeholder="mail.beispiel.de" autoComplete="off" className={inputClass} />
          </div>
          <div>
            <label htmlFor="smtp-port" className="block text-[13px] font-semibold">Port</label>
            <input id="smtp-port" inputMode="numeric" value={smtp.port} onChange={(e) => setSmtp({ ...smtp, port: e.target.value })} placeholder="587" autoComplete="off" className={inputClass} />
          </div>
          <div>
            <label htmlFor="smtp-user" className="block text-[13px] font-semibold">Benutzername</label>
            <input id="smtp-user" value={smtp.user} onChange={(e) => setSmtp({ ...smtp, user: e.target.value })} autoComplete="username" className={inputClass} />
          </div>
          <div>
            <label htmlFor="smtp-pass" className="block text-[13px] font-semibold">Passwort</label>
            <input id="smtp-pass" type="password" value={smtp.pass} onChange={(e) => setSmtp({ ...smtp, pass: e.target.value })} autoComplete="new-password" placeholder={status.smtp.passGesetzt ? "••••••••" : ""} className={inputClass} />
            <SecretHint gesetzt={status.smtp.passGesetzt} />
          </div>
          <div>
            <label htmlFor="smtp-from" className="block text-[13px] font-semibold">Absender</label>
            <input id="smtp-from" type="email" value={smtp.from} onChange={(e) => setSmtp({ ...smtp, from: e.target.value })} placeholder="gutscheine@beispiel.de" autoComplete="email" className={inputClass} />
          </div>
        </div>
        <button
          type="button"
          onClick={() => onSave("smtp", { smtp_host: smtp.host, smtp_port: smtp.port, smtp_user: smtp.user, smtp_pass: smtp.pass, mail_from: smtp.from }, "E-Mail-Einstellungen gespeichert.")}
          className="mt-4 h-11 rounded-field bg-brand-600 px-6 text-sm font-semibold text-white transition-colors hover:bg-brand-700 active:scale-[0.99]"
        >
          Speichern
        </button>
      </Section>

      <Section title="Telegram">
        <label htmlFor="tg-token" className="block text-[13px] font-semibold">Bot-Token</label>
        <input
          id="tg-token"
          type="password"
          value={telegramToken}
          onChange={(e) => setTelegramToken(e.target.value)}
          autoComplete="off"
          placeholder={status.telegram.botTokenGesetzt ? "••••••••" : "123456:ABC-DEF…"}
          className={inputClass}
        />
        <SecretHint gesetzt={status.telegram.botTokenGesetzt} />
        <button
          type="button"
          onClick={() => onSave("telegram", { telegram_bot_token: telegramToken }, "Telegram-Token gespeichert.")}
          className="mt-4 h-11 rounded-field bg-brand-600 px-6 text-sm font-semibold text-white transition-colors hover:bg-brand-700 active:scale-[0.99]"
        >
          Speichern
        </button>
      </Section>

      <Section title="Anbieterlogos (Logo.dev)">
        <div className="grid gap-4 sm:grid-cols-2">
          <div>
            <label htmlFor="logo-secret" className="block text-[13px] font-semibold">Secret-Key (Suche)</label>
            <input
              id="logo-secret"
              type="password"
              value={logoSecret}
              onChange={(e) => setLogoSecret(e.target.value)}
              autoComplete="off"
              placeholder={status.logo.secretGesetzt ? "••••••••" : "sk_…"}
              className={inputClass}
            />
            <SecretHint gesetzt={status.logo.secretGesetzt} />
          </div>
          <div>
            <label htmlFor="logo-public" className="block text-[13px] font-semibold">Public-Key (Anzeige)</label>
            <input
              id="logo-public"
              value={logoPublic}
              onChange={(e) => setLogoPublic(e.target.value)}
              autoComplete="off"
              placeholder="pk_…"
              className={inputClass}
            />
          </div>
        </div>
        <button
          type="button"
          onClick={() => onSave("logo", { logo_dev_secret_key: logoSecret, logo_dev_publishable_key: logoPublic }, "Logo.dev-Schlüssel gespeichert.")}
          className="mt-4 h-11 rounded-field bg-brand-600 px-6 text-sm font-semibold text-white transition-colors hover:bg-brand-700 active:scale-[0.99]"
        >
          Speichern
        </button>
      </Section>

      {notice && <p role="status" className="text-sm font-medium text-muted">{notice}</p>}
    </div>
  );
}