import { useCallback, useEffect, useMemo, useRef, useState } from "react";
import type { ChangeEvent, ReactNode } from "react";
import {
  Bell,
  KeyRound,
  LogOut,
  ShieldCheck,
  Upload,
  User as UserIcon,
} from "lucide-react";
import type { LoginSession, Team, User, UserPreference } from "../types";
import { TeamModal } from "../components/overlays";

type SectionKey = "profile" | "security" | "notify" | "pref" | "display";

// 可导航(UI 可见)的分区。pref(创作默认)/ display(显示)已隐藏入口,故不在此列。
const SECTION_KEYS: SectionKey[] = ["profile", "security", "notify"];

const NAV: Array<{ group: string; items: Array<{ key: SectionKey; label: string; icon: ReactNode }> }> = [
  {
    group: "个人",
    items: [
      { key: "profile", label: "个人信息", icon: <UserIcon /> },
      { key: "security", label: "安全", icon: <ShieldCheck /> },
      { key: "notify", label: "通知", icon: <Bell /> },
    ],
  },
  // 「偏好」组(创作默认 / 显示)已隐藏 —— 入口移除,对应面板因导航不可达而不再显示。
];

const TEMPLATE_CHOICES = [
  { v: "pain", t: "痛点种草", d: "// 30s 默认档" },
  { v: "unbox", t: "开箱测评", d: "// 45s 默认档" },
  { v: "compare", t: "对比展示", d: "// 45s 默认档" },
  { v: "howto", t: "教程演示", d: "// 60s 默认档" },
  { v: "drama", t: "剧情带货", d: "// 60s 默认档" },
];

const SUBTITLE_CHOICES = [
  { v: "big-variety", t: "大字综艺", d: "// 抖音热门" },
  { v: "clean-ec", t: "简洁电商", d: "// 信息清晰" },
  { v: "premium", t: "高级排版", d: "// 居中衬线" },
  { v: "bullet", t: "弹幕轻量", d: "// 滚动出现" },
  { v: "emphasis", t: "强调爆款", d: "// 高对比" },
];

const DURATIONS = ["30", "45", "60"];

// 从 User-Agent 提取「系统 · 浏览器」可读名
function deviceName(ua: string): string {
  if (!ua) return "未知设备";
  const os = /Windows/i.test(ua) ? "Windows" : /Mac OS X|Macintosh/i.test(ua) ? "macOS" : /iPhone|iPad/i.test(ua) ? "iOS" : /Android/i.test(ua) ? "Android" : /Linux/i.test(ua) ? "Linux" : "设备";
  const browser = /Edg/i.test(ua) ? "Edge" : /Chrome/i.test(ua) ? "Chrome" : /Safari/i.test(ua) ? "Safari" : /Firefox/i.test(ua) ? "Firefox" : ua.slice(0, 24);
  return `${os} · ${browser}`;
}

const NOTIFY_ROWS: Array<{ key: string; title: string; sub?: string; channels: string }> = [
  { key: "n-export", title: "项目完成通知", sub: "// 视频导出后", channels: "站内 · 邮件 · 短信" },
  { key: "n-fail", title: "任务失败告警", channels: "站内 · 邮件" },
  { key: "n-quota", title: "额度不足提醒", sub: "// 团队或个人剩余 < 20%", channels: "站内 · 短信" },
  { key: "n-login", title: "异地登录告警", channels: "短信" },
];

// ─── 偏好默认值 · 与后端 UserPreference 默认一致(后端到达前的占位) ───
const DEFAULT_PREFS = {
  template: "pain",
  duration: "60",
  subtitle: "big-variety",
  bgm: "kapian",
  transition: "fade",
  twoFactor: false,
  notify: { "n-export": true, "n-fail": true, "n-quota": true, "n-login": true } as Record<string, boolean>,
  appearance: "system",
  language: "zh",
  density: "standard",
};

// ─── 可统一保存的脏字段全集(draft 与 baseline 逐字段 diff,聚合驱动顶栏/nav/beforeunload) ───
// 不含:头像(FormData 文件操作)/ 改密 / 会话下线 —— 这些是即时副作用,各自有独立确认,不计入脏字段。
type TrackedState = {
  // profile · 个人信息
  name: string;
  email: string;
  phone: string;
  // pref · 创作默认
  template: string;
  duration: string;
  subtitle: string;
  bgm: string;
  transition: string;
  // security · 安全(两步验证)
  twoFactor: boolean;
  // notify · 通知开关
  notify: Record<string, boolean>;
  // display · 显示
  appearance: string;
  language: string;
  density: string;
};

// 脏字段 → 所属 section(顶栏计数 + nav dirty-dot 用)
const FIELD_SECTION: Record<keyof TrackedState, SectionKey> = {
  name: "profile",
  email: "profile",
  phone: "profile",
  template: "pref",
  duration: "pref",
  subtitle: "pref",
  bgm: "pref",
  transition: "pref",
  twoFactor: "security",
  notify: "notify",
  appearance: "display",
  language: "display",
  density: "display",
};

function notifyEqual(a: Record<string, boolean>, b: Record<string, boolean>): boolean {
  return NOTIFY_ROWS.every((row) => !!a[row.key] === !!b[row.key]);
}

function Switch({ checked, disabled, onChange }: { checked: boolean; disabled?: boolean; onChange?: (next: boolean) => void }) {
  return (
    <label className="switch">
      <input type="checkbox" checked={checked} disabled={disabled} onChange={(event) => onChange?.(event.target.checked)} />
      <span className="slider" />
    </label>
  );
}

export function SettingsPage({
  user,
  team,
  initialSection = "profile",
  preferences,
  sessions = [],
  onSavePreferences,
  onRevokeSession,
  onRevokeOthers,
  onSaveProfile,
  onChangePassword,
  onUploadAvatar,
  onResetAvatar,
  onNotify,
  onLogout,
}: {
  user: User;
  team: Team;
  initialSection?: string;
  preferences?: UserPreference | null;
  sessions?: LoginSession[];
  onSavePreferences?: (payload: Partial<UserPreference>) => void | Promise<unknown>;
  onRevokeSession?: (id: string) => void | Promise<unknown>;
  onRevokeOthers?: () => void | Promise<unknown>;
  onSaveProfile: (payload: { name?: string; phone?: string; email?: string }) => void | Promise<unknown>;
  onChangePassword: (payload: { old_password: string; new_password: string }) => void | Promise<unknown>;
  onUploadAvatar: (formData: FormData) => void | Promise<unknown>;
  onResetAvatar?: () => void | Promise<unknown>;
  onNotify?: (text: string) => void;
  onLogout?: () => void | Promise<void>;
}) {
  const normalizedInitial = (SECTION_KEYS as readonly string[]).includes(initialSection)
    ? (initialSection as SectionKey)
    : "profile";
  const [section, setSection] = useState<SectionKey>(normalizedInitial);
  const [modal, setModal] = useState<"" | "avatar" | "logout" | "password">("");

  // ─── 统一保存:已保存基线(baseline)从真实用户/后端 preferences 注入 ───
  const baselineFromProps = useMemo<TrackedState>(() => {
    const cd = preferences?.creation_defaults;
    const dp = preferences?.display;
    return {
      // 显示名称存在后端 first_name(UserSerializer 暴露),username 不随保存变;优先读 first_name 回退 username
      name: (user as { first_name?: string }).first_name || user.username || "",
      email: user.email || "",
      phone: "",
      template: cd?.template ?? DEFAULT_PREFS.template,
      duration: cd?.duration ?? DEFAULT_PREFS.duration,
      subtitle: cd?.subtitle ?? DEFAULT_PREFS.subtitle,
      bgm: cd?.bgm ?? DEFAULT_PREFS.bgm,
      transition: cd?.transition ?? DEFAULT_PREFS.transition,
      twoFactor: !!preferences?.two_factor_enabled,
      notify: { ...DEFAULT_PREFS.notify, ...(preferences?.notify || {}) },
      appearance: dp?.appearance ?? DEFAULT_PREFS.appearance,
      language: dp?.language ?? DEFAULT_PREFS.language,
      density: dp?.density ?? DEFAULT_PREFS.density,
    };
  }, [user, preferences]);

  // baseline = 已保存值;draft = 当前编辑值。diff(draft, baseline) = 脏字段。
  const [baseline, setBaseline] = useState<TrackedState>(baselineFromProps);
  const [draft, setDraft] = useState<TrackedState>(baselineFromProps);
  const [saving, setSaving] = useState(false);

  // 后端 preferences / user 到达或刷新时,把新值同时灌进 baseline 与 draft(用户未改时跟随后端)
  useEffect(() => {
    setBaseline(baselineFromProps);
    setDraft(baselineFromProps);
  }, [baselineFromProps]);

  // 单字段 draft 更新器
  const patchDraft = useCallback(<K extends keyof TrackedState>(key: K, value: TrackedState[K]) => {
    setDraft((prev) => ({ ...prev, [key]: value }));
  }, []);

  // ─── 聚合脏字段集 + 涉及分区集(顶栏计数 / nav dirty-dot / beforeunload 全由此驱动) ───
  const dirtyFields = useMemo<Array<keyof TrackedState>>(() => {
    const keys = Object.keys(FIELD_SECTION) as Array<keyof TrackedState>;
    return keys.filter((key) => {
      if (key === "notify") return !notifyEqual(draft.notify, baseline.notify);
      return draft[key] !== baseline[key];
    });
  }, [draft, baseline]);

  const dirtySections = useMemo<Set<SectionKey>>(() => {
    const set = new Set<SectionKey>();
    dirtyFields.forEach((key) => set.add(FIELD_SECTION[key]));
    return set;
  }, [dirtyFields]);

  const dirtyCount = dirtyFields.length;
  const isDirty = dirtyCount > 0;

  // 个人信息 · 受控输入(draft 派生)
  const name = draft.name;
  const email = draft.email;
  const phone = draft.phone;

  // 改密 · 受控输入
  const [oldPassword, setOldPassword] = useState("");
  const [newPassword, setNewPassword] = useState("");
  const [pwSubmitted, setPwSubmitted] = useState(false);
  const [savingPassword, setSavingPassword] = useState(false);
  const pwTooShort = newPassword.length > 0 && newPassword.length < 8;
  const pwReady = oldPassword.length > 0 && newPassword.length >= 8;

  // 头像 · 文件选择 + 本地预览
  const fileInputRef = useRef<HTMLInputElement>(null);
  const [avatarFile, setAvatarFile] = useState<File | null>(null);
  const [avatarPreview, setAvatarPreview] = useState<string>("");
  const [savingAvatar, setSavingAvatar] = useState(false);

  const avatarChar = useMemo(() => (name || user.username || "李").slice(0, 1).toUpperCase(), [name, user.username]);

  // ─── nav badge · 由 state 计算(通知开启数 / 设备数),不写死 ───
  const notifyOnCount = useMemo(() => NOTIFY_ROWS.filter((row) => !!draft.notify[row.key]).length, [draft.notify]);
  const navBadge = useCallback(
    (key: SectionKey): string | null => {
      if (key === "notify") return `${notifyOnCount}/${NOTIFY_ROWS.length}`;
      if (key === "security") return `${sessions.length} 设备`;
      return null;
    },
    [notifyOnCount, sessions.length],
  );

  // ─── 取消:draft 回退到 baseline(放弃所有未保存改动) ───
  function discardChanges() {
    if (!isDirty) return;
    setDraft(baseline);
    onNotify?.("已放弃未保存的改动");
  }

  // ─── 统一保存:把所有脏字段拆成 profile / preferences 两个 payload 提交,成功后把 draft 升为新基线 ───
  async function handleSaveAll() {
    if (!isDirty || saving) return;
    setSaving(true);
    try {
      const profilePayload: { name?: string; email?: string; phone?: string } = {};
      if (draft.name !== baseline.name) profilePayload.name = draft.name.trim();
      if (draft.email !== baseline.email) profilePayload.email = draft.email.trim();
      if (draft.phone !== baseline.phone) profilePayload.phone = draft.phone.trim();

      const prefPayload: Partial<UserPreference> = {};
      const creationKeys: Array<keyof TrackedState> = ["template", "duration", "subtitle", "bgm", "transition"];
      if (creationKeys.some((key) => draft[key] !== baseline[key])) {
        prefPayload.creation_defaults = {
          template: draft.template,
          duration: draft.duration,
          subtitle: draft.subtitle,
          bgm: draft.bgm,
          transition: draft.transition,
        };
      }
      const displayKeys: Array<keyof TrackedState> = ["appearance", "language", "density"];
      if (displayKeys.some((key) => draft[key] !== baseline[key])) {
        prefPayload.display = { appearance: draft.appearance, language: draft.language, density: draft.density };
      }
      if (!notifyEqual(draft.notify, baseline.notify)) prefPayload.notify = { ...draft.notify };
      if (draft.twoFactor !== baseline.twoFactor) prefPayload.two_factor_enabled = draft.twoFactor;

      const tasks: Array<Promise<unknown>> = [];
      if (Object.keys(profilePayload).length > 0) tasks.push(Promise.resolve(onSaveProfile(profilePayload)));
      if (Object.keys(prefPayload).length > 0 && onSavePreferences) tasks.push(Promise.resolve(onSavePreferences(prefPayload)));
      await Promise.all(tasks);

      // 提交成功 → draft 升为新基线,脏集清空
      const savedCount = dirtyCount;
      setBaseline(draft);
      onNotify?.(`${savedCount} 项已保存`);
    } finally {
      setSaving(false);
    }
  }

  function openPasswordModal() {
    setOldPassword("");
    setNewPassword("");
    setPwSubmitted(false);
    setModal("password");
  }

  async function handleChangePassword() {
    setPwSubmitted(true);
    if (!pwReady || savingPassword) return;
    setSavingPassword(true);
    try {
      await onChangePassword({ old_password: oldPassword, new_password: newPassword });
      setModal("");
      setOldPassword("");
      setNewPassword("");
      setPwSubmitted(false);
    } finally {
      setSavingPassword(false);
    }
  }

  function openAvatarModal() {
    setAvatarFile(null);
    setAvatarPreview("");
    setModal("avatar");
  }

  function onPickAvatar(event: ChangeEvent<HTMLInputElement>) {
    const file = event.target.files?.[0];
    if (!file) return;
    setAvatarFile(file);
    setAvatarPreview(URL.createObjectURL(file));
  }

  async function handleUploadAvatar() {
    if (!avatarFile || savingAvatar) return;
    setSavingAvatar(true);
    try {
      const fd = new FormData();
      fd.append("file", avatarFile);
      await onUploadAvatar(fd);
      setModal("");
      setAvatarFile(null);
      setAvatarPreview("");
    } finally {
      setSavingAvatar(false);
    }
  }

  // 预览 URL 在切换/卸载时释放,避免内存泄漏
  useEffect(() => {
    if (!avatarPreview) return;
    return () => URL.revokeObjectURL(avatarPreview);
  }, [avatarPreview]);

  // ─── 离开页面前提醒:有未保存改动时弹浏览器原生确认 ───
  useEffect(() => {
    if (!isDirty) return;
    const handler = (event: BeforeUnloadEvent) => {
      event.preventDefault();
      event.returnValue = "";
    };
    window.addEventListener("beforeunload", handler);
    return () => window.removeEventListener("beforeunload", handler);
  }, [isDirty]);

  return (
    <section className="settings-page">
      <div className="page-head">
        <div>
          <h1>设置</h1>
          <div className="sub"><span className="mono">// 个人信息 · 偏好 · 通知 · 安全</span></div>
        </div>
        <div className="actions">
          <button className="btn" type="button" onClick={discardChanges} disabled={!isDirty || saving}>取消</button>
          <button className="btn btn-primary" type="button" onClick={handleSaveAll} disabled={!isDirty || saving}>
            <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round"><path d="M4 12l5 5L20 6" /></svg>
            保存所有变更
            {isDirty ? <span className="save-count">· {dirtyCount} 项</span> : null}
          </button>
        </div>
      </div>

      <div className="settings-grid">
        {/* 左侧 nav */}
        <aside className="settings-nav" role="tablist" aria-label="设置分区">
          {NAV.map((group, gi) => (
            <div key={group.group}>
              <div className="nav-h" style={gi > 0 ? { marginTop: 16 } : undefined}>{group.group}</div>
              {group.items.map((item) => {
                const badge = navBadge(item.key);
                const dirty = dirtySections.has(item.key);
                return (
                  <a
                    key={item.key}
                    href={`#sec-${item.key}`}
                    className={`${section === item.key ? "active" : ""}${dirty ? " has-changes" : ""}`}
                    role="tab"
                    aria-selected={section === item.key}
                    onClick={(event) => {
                      event.preventDefault();
                      setSection(item.key);
                    }}
                  >
                    {item.icon}
                    <span>{item.label}</span>
                    {badge ? <span className="nav-badge">{badge}</span> : null}
                    <span className="nav-dot" aria-hidden="true" />
                  </a>
                );
              })}
            </div>
          ))}
          <div className="nav-h" style={{ marginTop: 16 }}>账号</div>
          <button className="logout-pill" type="button" onClick={() => setModal("logout")}>
            <LogOut />
            <span>退出登录</span>
          </button>
        </aside>

        {/* 右侧内容 */}
        <main>
          {section === "profile" && (
            <section className="pane" aria-label="个人信息">
              <h3>个人信息</h3>
              <div className="pane-desc">// 头像、姓名、联系方式 · 邮箱用于接收通知</div>

              <div className="form-row">
                <div className="lbl">头像</div>
                <div className="val">
                  <div className="avatar-edit">
                    <div className="av-big">{avatarChar}</div>
                    <div className="av-actions">
                      <button className="btn btn-sm" type="button" onClick={openAvatarModal}>上传新头像</button>
                      <button className="btn btn-ghost btn-sm" type="button" onClick={() => onResetAvatar?.()}>恢复默认</button>
                    </div>
                  </div>
                </div>
              </div>
              <div className="form-row">
                <div className="lbl">显示名称<span className="req">*</span></div>
                <div className="val"><input className="input" value={name} onChange={(event) => patchDraft("name", event.target.value)} /></div>
              </div>
              <div className="form-row">
                <div className="lbl">登录邮箱</div>
                <div className="val">
                  <input className="input" type="email" value={email} onChange={(event) => patchDraft("email", event.target.value)} />
                  <button className="btn btn-ghost btn-sm" type="button" onClick={() => onNotify?.(email ? `已向 ${email} 发送验证邮件` : "请先填写邮箱")}>验证</button>
                </div>
              </div>
              <div className="form-row">
                <div className="lbl">手机号</div>
                <div className="val">
                  <input className="input" value={phone} onChange={(event) => patchDraft("phone", event.target.value)} placeholder="138****8000" />
                  <span className="switch-note">// 在「保存所有变更」中一并提交</span>
                </div>
              </div>
              <div className="form-row">
                <div className="lbl">所属团队<div className="lbl-sub">// 一人一团队</div></div>
                <div className="val">
                  <span className="static">{team.name}</span>
                  <span className="role-tag"><span className="dot" />超管 · 创建者</span>
                  <a href="#team" className="row-link">管理团队 →</a>
                </div>
              </div>
              <div className="form-row">
                <div className="lbl">用户 ID<div className="lbl-sub">// 不可改</div></div>
                <div className="val"><span className="static mono">{user.id}</span></div>
              </div>
            </section>
          )}

          {section === "security" && (
            <section className="pane" aria-label="安全">
              <h3>安全</h3>
              <div className="pane-desc">// 登录密码、双因素、在用设备</div>

              <div className="form-row">
                <div className="lbl">登录密码</div>
                <div className="val">
                  <span className="static mono">●●●●●●●●●●</span>
                  <span className="row-note" style={{ marginLeft: "auto" }}>上次修改 2026-04-12</span>
                  <button className="btn btn-sm" type="button" style={{ marginLeft: 10 }} onClick={openPasswordModal}>修改</button>
                </div>
              </div>
              <div className="form-row">
                <div className="lbl">两步验证<div className="lbl-sub">// 推荐开启</div></div>
                <div className="val">
                  <Switch checked={draft.twoFactor} onChange={(v) => patchDraft("twoFactor", v)} />
                  <span className="switch-note">短信 + Authenticator</span>
                </div>
              </div>

              <h3 className="sub-head">在用设备</h3>
              <div className="pane-desc">// 真实登录会话 · 每次登录记录设备 UA / IP</div>
              <div className="device-list">
                {sessions.length === 0 ? (
                  <div className="device-row"><div className="meta" style={{ padding: "8px 0" }}>// 暂无其他登录会话记录</div></div>
                ) : (
                  sessions.map((s) => {
                    const isPhone = /iphone|android|mobile/i.test(s.user_agent);
                    return (
                      <div className="device-row" key={s.id}>
                        <div className="ic">
                          {isPhone ? (
                            <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.6" strokeLinecap="round" strokeLinejoin="round"><rect x="6" y="2" width="12" height="20" rx="2" /><path d="M11 18h2" /></svg>
                          ) : (
                            <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.6" strokeLinecap="round" strokeLinejoin="round"><rect x="3" y="4" width="18" height="14" rx="2" /><path d="M2 20h20" /></svg>
                          )}
                        </div>
                        <div>
                          <div className="nm">{deviceName(s.user_agent)}{s.is_current ? <span className="tag-cur">CURRENT</span> : null}</div>
                          <div className="meta">// {s.ip_address || "未知 IP"} · {new Date(s.last_seen_at || s.created_at).toLocaleString("zh-CN")}</div>
                        </div>
                        <div className="spacer" />
                        {s.is_current
                          ? <span className="row-note">当前会话</span>
                          : <button className="btn btn-ghost btn-sm" type="button" onClick={() => onRevokeSession?.(s.id)}>下线</button>}
                      </div>
                    );
                  })
                )}
              </div>
              <div style={{ marginTop: 14 }}>
                <button className="btn" type="button" onClick={() => onRevokeOthers?.()} disabled={sessions.length <= 1}>下线所有其他设备</button>
              </div>
            </section>
          )}

          {section === "notify" && (
            <section className="pane" aria-label="通知">
              <h3>通知</h3>
              <div className="pane-desc">// 邮件、短信、站内提示开关</div>
              {NOTIFY_ROWS.map((row) => (
                <div className="form-row" key={row.key}>
                  <div className="lbl">{row.title}{row.sub ? <div className="lbl-sub">{row.sub}</div> : null}</div>
                  <div className="val">
                    <Switch checked={!!draft.notify[row.key]} onChange={(next) => patchDraft("notify", { ...draft.notify, [row.key]: next })} />
                    <span className="switch-note">{row.channels}</span>
                  </div>
                </div>
              ))}
            </section>
          )}

          {section === "pref" && (
            <section className="pane" aria-label="创作默认">
              <h3>创作默认</h3>
              <div className="pane-desc">// 新建项目时的预填值,可在向导中改</div>

              <div className="form-row row-top">
                <div className="lbl">默认模板</div>
                <div className="val">
                  <div className="pref-choices">
                    {TEMPLATE_CHOICES.map((choice) => (
                      <div
                        key={choice.v}
                        className={`pref-choice ${draft.template === choice.v ? "selected" : ""}`}
                        role="button"
                        tabIndex={0}
                        onClick={() => patchDraft("template", choice.v)}
                      >
                        <div className="t">{choice.t}</div>
                        <div className="d">{choice.d}</div>
                      </div>
                    ))}
                  </div>
                </div>
              </div>
              <div className="form-row">
                <div className="lbl">默认时长档</div>
                <div className="val">
                  <div className="duration-row">
                    {DURATIONS.map((d) => (
                      <span
                        key={d}
                        className={`dur-chip ${draft.duration === d ? "selected" : ""}`}
                        role="button"
                        tabIndex={0}
                        onClick={() => patchDraft("duration", d)}
                      >
                        {d}s
                      </span>
                    ))}
                  </div>
                  <span className="switch-note" style={{ marginLeft: 10 }}>// 60s = 4 段 × 15s</span>
                </div>
              </div>
              <div className="form-row row-top">
                <div className="lbl">默认字幕样式</div>
                <div className="val">
                  <div className="pref-choices">
                    {SUBTITLE_CHOICES.map((choice) => (
                      <div
                        key={choice.v}
                        className={`pref-choice ${draft.subtitle === choice.v ? "selected" : ""}`}
                        role="button"
                        tabIndex={0}
                        onClick={() => patchDraft("subtitle", choice.v)}
                      >
                        <div className="t">{choice.t}</div>
                        <div className="d">{choice.d}</div>
                      </div>
                    ))}
                  </div>
                </div>
              </div>
              <div className="form-row">
                <div className="lbl">默认 BGM 库</div>
                <div className="val">
                  <select className="select" value={draft.bgm} onChange={(event) => patchDraft("bgm", event.target.value)}>
                    <option value="kapian">抖音 Top10 卡点曲库</option>
                    <option value="emotion">情绪向 · 治愈/悬念</option>
                    <option value="urban">都市电子 · 通勤场景</option>
                    <option value="none">无 BGM</option>
                  </select>
                </div>
              </div>
              <div className="form-row">
                <div className="lbl">默认转场</div>
                <div className="val">
                  <select className="select" value={draft.transition} onChange={(event) => patchDraft("transition", event.target.value)}>
                    <option value="none">无转场</option>
                    <option value="fade">淡入淡出 · 0.3s</option>
                    <option value="slide">滑动 · 0.3s</option>
                    <option value="zoom">缩放 · 0.3s</option>
                  </select>
                </div>
              </div>
              <div className="form-row">
                <div className="lbl">导出水印<div className="lbl-sub">// VIP 可关闭</div></div>
                <div className="val">
                  <Switch checked disabled />
                  <span className="switch-note">右下角 · Airshelf</span>
                  <a href="#account" className="row-link">升级 VIP →</a>
                </div>
              </div>
            </section>
          )}

          {section === "display" && (
            <section className="pane" aria-label="显示">
              <h3>显示</h3>
              <div className="pane-desc">// 界面外观与语言</div>

              <div className="form-row">
                <div className="lbl">外观</div>
                <div className="val">
                  <select className="select" value={draft.appearance} onChange={(event) => patchDraft("appearance", event.target.value)}>
                    <option value="system">跟随系统</option>
                    <option value="light">浅色</option>
                    <option value="dark" disabled>深色(V2)</option>
                  </select>
                </div>
              </div>
              <div className="form-row">
                <div className="lbl">语言</div>
                <div className="val">
                  <select className="select" value={draft.language} onChange={(event) => patchDraft("language", event.target.value)}>
                    <option value="zh">简体中文</option>
                    <option value="en" disabled>English(V2)</option>
                  </select>
                </div>
              </div>
              <div className="form-row">
                <div className="lbl">表格密度</div>
                <div className="val">
                  <select className="select" value={draft.density} onChange={(event) => patchDraft("density", event.target.value)}>
                    <option value="compact">紧凑</option>
                    <option value="standard">标准</option>
                    <option value="loose">宽松</option>
                  </select>
                </div>
              </div>
            </section>
          )}

          <div className="settings-foot">// Airshelf · v2.1 · build 20260521</div>
        </main>
      </div>

      {/* 上传头像 modal · 选图 → FormData(file) → onUploadAvatar */}
      <TeamModal
        open={modal === "avatar"}
        title="上传头像"
        subtitle="// 用于个人主页、评论与团队展示"
        icon={<Upload size={16} />}
        close={() => setModal("")}
        footer={
          <button className="btn btn-primary" type="button" onClick={handleUploadAvatar} disabled={!avatarFile || savingAvatar}>
            <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round"><path d="M4 12l5 5L20 6" /></svg>
            确认使用
          </button>
        }
      >
        <div className="av-up-preview-row">
          <div className="av-up-preview">
            {avatarPreview ? <img src={avatarPreview} alt="头像预览" /> : avatarChar}
          </div>
          <div className="av-up-preview-meta">
            <div className="t">{avatarFile ? avatarFile.name : "当前头像 · 默认"}</div>
            <div className="d">{avatarFile ? `// ${(avatarFile.size / 1024).toFixed(0)} KB · 已选择` : "// 系统生成 · 取姓氏首字"}</div>
          </div>
        </div>

        <input
          ref={fileInputRef}
          type="file"
          accept="image/*"
          style={{ display: "none" }}
          onChange={onPickAvatar}
        />
        <div
          className="upload-zone"
          role="button"
          tabIndex={0}
          aria-label="点击选择图片上传"
          onClick={() => fileInputRef.current?.click()}
          onKeyDown={(event) => {
            if (event.key === "Enter" || event.key === " ") {
              event.preventDefault();
              fileInputRef.current?.click();
            }
          }}
        >
          <span className="uz-ic">
            <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round"><path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4" /><polyline points="17 8 12 3 7 8" /><line x1="12" y1="3" x2="12" y2="15" /></svg>
          </span>
          <div><strong>点击选择</strong> · 图片文件</div>
          <span className="uz-hint">JPG / PNG / WebP · ≤ 2 MB · 推荐 256 × 256</span>
        </div>

        <div className="av-up-rules">
          <div className="li">最大 2 MB · 长宽比建议 1:1 · 系统会自动裁切为圆形</div>
          <div className="li">不要上传含他人肖像的图片,违规可能导致账号封停</div>
        </div>
      </TeamModal>

      {/* 修改密码 modal · 原密码 + 新密码(≥8)→ onChangePassword */}
      <TeamModal
        open={modal === "password"}
        title="修改登录密码"
        subtitle="// CHANGE PASSWORD"
        icon={<KeyRound size={16} />}
        close={() => setModal("")}
        footer={
          <button className="btn btn-primary" type="button" onClick={handleChangePassword} disabled={!pwReady || savingPassword}>
            <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round"><path d="M4 12l5 5L20 6" /></svg>
            确认修改
          </button>
        }
      >
        <div className="field">
          <label className="field-label" htmlFor="pw-old">原密码<span className="req">*</span></label>
          <input
            id="pw-old"
            className="input"
            type="password"
            autoComplete="current-password"
            value={oldPassword}
            onChange={(event) => setOldPassword(event.target.value)}
            placeholder="输入当前密码"
          />
          {pwSubmitted && !oldPassword ? <span className="field-hint pw-err">请输入原密码</span> : null}
        </div>
        <div className="field" style={{ marginBottom: 0 }}>
          <label className="field-label" htmlFor="pw-new">新密码<span className="req">*</span></label>
          <input
            id="pw-new"
            className="input"
            type="password"
            autoComplete="new-password"
            value={newPassword}
            onChange={(event) => setNewPassword(event.target.value)}
            placeholder="至少 8 位"
          />
          {pwTooShort || (pwSubmitted && newPassword.length < 8)
            ? <span className="field-hint pw-err">新密码至少 8 位</span>
            : <span className="field-hint">// 建议混合字母、数字与符号</span>}
        </div>
      </TeamModal>

      {/* 退出登录确认 modal · 仅视觉还原,无后端接入 */}
      <TeamModal
        open={modal === "logout"}
        title="退出当前账号"
        subtitle="// LOG OUT CURRENT SESSION"
        icon={<LogOut size={16} />}
        close={() => setModal("")}
        footer={
          <button className="btn btn-primary" type="button" onClick={() => { setModal(""); void onLogout?.(); }}>
            <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round"><path d="M9 21H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h4" /><path d="m16 17 5-5-5-5" /><path d="M21 12H9" /></svg>
            确认退出
          </button>
        }
      >
        <p className="logout-confirm-copy">确认后将退出当前设备上的 Airshelf,再次使用需要重新登录。</p>
        <div className="logout-confirm-points">
          <div className="li">项目、资产、团队成员与余额数据都会保留</div>
          <div className="li">仅影响当前浏览器会话,不会下线其他设备</div>
        </div>
        {isDirty ? <div className="logout-unsaved-note">当前有 {dirtyCount} 项未保存的设置变更,退出后这些变更不会保存。</div> : null}
      </TeamModal>
    </section>
  );
}