// frontend/components/settings/SettingsClient.tsx — 설정 오케스트레이터 (좌측 탭 + 메인 + 토스트)
"use client";
import { useCallback, useEffect, useRef, useState } from "react";
import { Icon } from "@/components/Icon";
import type { IconName } from "@/components/icons/paths";
import { AccountTab } from "./AccountTab";
import { MailTab } from "./MailTab";
import { ConnectionsTab } from "./ConnectionsTab";
import { LlmTab } from "./LlmTab";
import { AppearanceTab } from "./AppearanceTab";
import { DataTab } from "./DataTab";

export type TabId = "account" | "mail" | "connect" | "llm" | "appearance" | "data";

type Tab = { id: TabId; label: string; desc: string; icon: IconName };

const TABS: Tab[] = [
  { id: "account", label: "계정", desc: "프로필 · 로그인", icon: "user" },
  { id: "mail", label: "메일", desc: "메일 계정 연결", icon: "mail" },
  { id: "connect", label: "연결", desc: "일정 · 금융 · 건강 · 지식", icon: "link" },
  { id: "llm", label: "AI · LLM", desc: "모델 연결 설정", icon: "brain" },
  { id: "appearance", label: "외관", desc: "테마", icon: "sun" },
  { id: "data", label: "데이터 · 보안", desc: "내보내기 · 토큰 · 시스템", icon: "shield" },
];

const TAB_IDS = TABS.map((t) => t.id);
function isTab(v: string): v is TabId {
  return (TAB_IDS as string[]).includes(v);
}

export type ToastFn = (msg: string, tone?: string) => void;

export function SettingsClient() {
  const [tab, setTab] = useState<TabId>("account");
  const [hydrated, setHydrated] = useState(false);
  const [toasts, setToasts] = useState<{ id: number; msg: string; tone: string }[]>([]);
  const shellRef = useRef<HTMLDivElement>(null);
  const tid = useRef(0);

  // localStorage + ?tab= 쿼리 복원
  useEffect(() => {
    if (typeof window === "undefined") return;
    try {
      const q = new URLSearchParams(window.location.search).get("tab");
      if (q && isTab(q)) {
        setTab(q);
      } else {
        const v = localStorage.getItem("ariS.tab");
        if (v && isTab(v)) setTab(v);
      }
    } catch {
      /* ignore */
    }
    setHydrated(true);
  }, []);
  useEffect(() => {
    if (!hydrated || typeof window === "undefined") return;
    try {
      localStorage.setItem("ariS.tab", tab);
    } catch {
      /* ignore */
    }
  }, [tab, hydrated]);

  useEffect(() => {
    const el = shellRef.current;
    const id = requestAnimationFrame(() => el && el.classList.add("entered"));
    return () => cancelAnimationFrame(id);
  }, [tab]);

  const toast = useCallback<ToastFn>((msg, tone = "blue") => {
    const id = ++tid.current;
    setToasts((t) => [...t, { id, msg, tone }]);
    setTimeout(() => setToasts((t) => t.filter((x) => x.id !== id)), 2600);
  }, []);

  // OAuth 콜백 복귀(?connect=ok|error) → 토스트 후 쿼리 정리(tab 은 보존)
  useEffect(() => {
    if (typeof window === "undefined") return;
    const params = new URLSearchParams(window.location.search);
    const connect = params.get("connect");
    if (!connect) return;
    const labels: Record<string, string> = {
      gmail: "Gmail",
      outlook: "Outlook",
      google_calendar: "Google 캘린더",
      outlook_calendar: "Outlook 캘린더",
    };
    const name = labels[params.get("provider") ?? ""] ?? "계정";
    if (connect === "ok") toast(`${name}을(를) 연결했어요`, "green");
    else toast("연결에 실패했어요. 다시 시도해 주세요", "coral");
    for (const k of ["connect", "domain", "provider"]) params.delete(k);
    const qs = params.toString();
    window.history.replaceState(null, "", window.location.pathname + (qs ? `?${qs}` : ""));
  }, [toast]);

  return (
    <div className="settingspage" ref={shellRef}>
      <div className="set-head">
        <div className="sh-ic" aria-hidden>
          <Icon name="gear" />
        </div>
        <div className="sh-txt">
          <h1>설정</h1>
          <p>계정, 연결, AI 모델, 외관까지 한곳에서 관리해요.</p>
        </div>
      </div>

      <div className="set-work">
        <nav className="set-rail" aria-label="설정 메뉴">
          {TABS.map((t) => (
            <button
              key={t.id}
              type="button"
              className={"set-tab" + (tab === t.id ? " active" : "")}
              aria-current={tab === t.id ? "page" : undefined}
              onClick={() => setTab(t.id)}
            >
              <span className="st-ic" aria-hidden>
                <Icon name={t.icon} />
              </span>
              <span className="st-txt">
                <b>{t.label}</b>
                <small>{t.desc}</small>
              </span>
            </button>
          ))}
        </nav>

        <main className="set-main" aria-live="polite">
          {tab === "account" && <AccountTab toast={toast} />}
          {tab === "mail" && <MailTab toast={toast} />}
          {tab === "connect" && <ConnectionsTab toast={toast} />}
          {tab === "llm" && <LlmTab toast={toast} />}
          {tab === "appearance" && <AppearanceTab toast={toast} />}
          {tab === "data" && <DataTab toast={toast} />}
        </main>
      </div>

      <div className="toast-wrap">
        {toasts.map((t) => (
          <div className="au-toast" key={t.id}>
            <span className="t-dot" style={{ background: `var(--${t.tone})` }} />
            {t.msg}
          </div>
        ))}
      </div>
    </div>
  );
}