import { useState } from 'react';

import { useQuery, useQueryClient } from '@tanstack/react-query';
import { Link, Outlet, useLocation, useNavigate } from 'react-router-dom';

import { Avatar } from '@/app/Avatar';
import { Icon } from '@/app/Icon';
import { logout as revokeServerSession } from '@/lib/api/auth';
import { getMe } from '@/lib/api/profile';
import { resetTinode } from '@/lib/tinode/connection';
import { requestConfirm } from '@/stores/confirmDialog';
import { notImplemented } from '@/stores/globalToast';
import { useSessionStore } from '@/stores/session';

const DIRECTORY = [
  { key: 'profile', to: '/settings/profile', icon: 'account_circle', label: '个人资料' },
  { key: 'security', to: '/settings/security', icon: 'security', label: '账号与安全' },
  { key: 'notifications', to: '/settings/notifications', icon: 'notifications', label: '消息通知' },
  { key: 'privacy', to: '/settings/privacy', icon: 'lock', label: '隐私' },
  { key: 'general', to: '/settings/general', icon: 'tune', label: '通用' },
];

/**
 * README §8.7 (mobile "我的" page): 我的收藏/通话记录 are grouped ABOVE the regular settings
 * directory. Desktop never needs this list -- those already have their own permanent NavRail icons
 * there -- but on a phone-width viewport (bottom tab bar instead of a rail) there is otherwise NO
 * way to reach `/favorites` or `/calls` at all short of typing the URL directly (confirmed live:
 * BottomTabBar.tsx only has 消息/通讯录/我的, unchanged since Phase 1-2 when those two routes didn't
 * exist yet) -- a real navigation gap this Phase 9 pass caught, not a cosmetic one. 文件助手 used to
 * be a third entry here (reusing the same `slf`-conversation redirect the desktop NavRail icon did)
 * but was removed along with every other entry point -- see ChatListColumn.tsx's PINNED_ENTRIES
 * doc comment for why.
 */
const MOBILE_SHORTCUTS = [
  { key: 'favorites', to: '/favorites', icon: 'inventory_2', label: '我的收藏', colorClass: 'text-accent' },
  { key: 'calls', to: '/calls', icon: 'phone', label: '通话记录', colorClass: 'text-warn' },
];

/** README §8.1 (3-column: Nav(global, settings 激活) / 目录 260px / 内容). */
export function SettingsLayout() {
  const location = useLocation();
  const navigate = useNavigate();
  const queryClient = useQueryClient();
  const setMyUserId = useSessionStore((s) => s.setMyUserId);
  const meQuery = useQuery({ queryKey: ['me'], queryFn: getMe });
  const [loggingOut, setLoggingOut] = useState(false);
  // README §8.7 draws TWO separate mobile screens (`#1d` 我的 hub, `#1e` 设置 sub-list) that don't
  // map 1:1 onto the desktop directory -- this is which of the two the bare `/settings` mobile route
  // currently shows. Irrelevant at `md`+ (desktop always shows the one real sidebar).
  const [mobileSubView, setMobileSubView] = useState(false);

  const logout = async () => {
    if (!(await requestConfirm({ message: '确定退出登录吗？' }))) return;
    setLoggingOut(true);
    // docs/IM-后端问题清单.md 问题22：这个接口此前三个候选路径都404，本地清理是唯一手段，最近
    // 复核确认它其实已经真实可用（同一token调用前后分别200/401，确认真的会被吊销）。必须在清空
    // sessionStorage的token之前调用（`authToken()`读的就是这个值），且失败不能阻塞本地清理这条
    // 兜底路径——不管服务端这次撤销成不成功，用户在这台设备上都应该被清出登录态。
    await revokeServerSession().catch(() => {});
    resetTinode();
    sessionStorage.removeItem('im-session-token');
    setMyUserId(null);
    // Deliberately NOT clearTenant() -- that clears useSessionStore's `tenant`, and LoginPage's own
    // `if (!tenant) return <Navigate to="/tenant" replace />` immediately bounces the navigate('/login')
    // below straight back to the tenant-code entry screen instead of this tenant's actual login page
    // (confirmed live: this used to be a real dead end, not a hypothetical). A plain logout should
    // stay on the same enterprise's login screen, ready for the same or a different user to sign back
    // in -- only the explicit "切换企业" link is supposed to clear the tenant.
    //
    // The QueryClient instance is module-scoped for the whole SPA lifetime (App.tsx) and survives a
    // client-side route change -- without this, a second account logging in on the same tab/device
    // (a shared kiosk machine, realistic for an enterprise client) would briefly render the FIRST
    // account's still-cached profile/privacy/blocks data before the background refetch resolves.
    queryClient.clear();
    navigate('/login');
  };

  // Below the desktop breakpoint there's no room to dock both columns (confirmed live: without
  // this, the 260px directory and the content column both try to render side by side on a phone-
  // width viewport, squeezing the content into a sliver narrow enough that its own text wraps
  // one character per line). Mirrors ContactsLayout's exact `showListOnNarrow` pattern: show the
  // directory only at the bare `/settings` index, content only once a specific section is picked.
  const showListOnNarrow = location.pathname === '/settings';

  return (
    <div className="flex h-full w-full">
      <aside className={`h-full w-full flex-none flex-col bg-white md:flex md:w-[260px] md:border-r md:border-border-panel ${showListOnNarrow ? 'flex' : 'hidden'}`}>
        {/* Desktop (README §8.1): one directory, matches ≥md exactly as before. */}
        <div className="hidden h-full flex-1 flex-col md:flex">
          <header className="flex h-15 flex-none items-center px-5">
            <h1 className="m-0 text-xl font-semibold text-text-heading">设置</h1>
          </header>
          <div className="flex items-center gap-3 border-b border-border-list-item px-5 pb-4.5 pt-2">
            <Avatar
              id={meQuery.data?.user_id || ''}
              name={meQuery.data?.profile.nickname}
              avatarFileId={meQuery.data?.profile.avatar_file_id}
              className="h-12 w-12 flex-none rounded-xl text-base"
            />
            <span className="flex min-w-0 flex-col gap-0.5">
              <strong className="truncate text-[15px] font-semibold text-text-body">{meQuery.data?.profile.nickname}</strong>
              <span className="truncate text-xs text-text-tertiary-2">ID：{meQuery.data?.profile.public_account}</span>
            </span>
          </div>
          <div className="flex flex-1 flex-col gap-0.5 overflow-y-auto px-3">
            {DIRECTORY.map((item) => {
              const active = location.pathname.startsWith(item.to);
              return (
                <Link
                  key={item.key}
                  to={item.to}
                  className={`flex items-center gap-3 rounded-lg px-3 py-2.5 text-sm no-underline ${
                    active ? 'bg-accent-selected-bg text-accent' : 'text-text-body hover:bg-[#f6f8fb]'
                  }`}
                >
                  <Icon name={item.icon} className="text-[18px]" />
                  <span className="flex-1">{item.label}</span>
                </Link>
              );
            })}
          </div>
          <button
            type="button"
            onClick={logout}
            disabled={loggingOut}
            className="mx-3 my-4 h-10 flex-none rounded-lg border border-[#d5d9df] text-sm text-text-secondary disabled:opacity-50"
          >
            退出登录
          </button>
        </div>

        {/* Mobile hub (README §8.7, mock `07/1d`) -- a "me" landing page, not a settings directory:
            tappable profile card (-> /settings/profile), 我的收藏/通话记录 (this app's only way to
            reach those two on a narrow viewport, see MOBILE_SHORTCUTS' own comment), then
            账号与安全/隐私 direct, and "设置" as its own second-level list rather than a 4th direct
            link -- these two screens genuinely don't share one flat structure in the mock. */}
        <div className={`flex-1 flex-col overflow-y-auto md:hidden ${mobileSubView ? 'hidden' : 'flex'}`}>
          <Link to="/settings/profile" className="flex items-center gap-3.5 bg-white px-5 py-5 no-underline">
            <Avatar
              id={meQuery.data?.user_id || ''}
              name={meQuery.data?.profile.nickname}
              avatarFileId={meQuery.data?.profile.avatar_file_id}
              className="h-16 w-16 flex-none rounded-2xl text-2xl"
            />
            <strong className="flex-1 truncate text-[19px] font-semibold text-text-heading">{meQuery.data?.profile.nickname}</strong>
            <Icon name="qr_code_2" className="flex-none text-xl text-text-tertiary-3" />
            <Icon name="chevron_right" className="flex-none text-xl text-icon-arrow" />
          </Link>
          <div className="flex flex-col gap-2.5 py-2.5">
            <div className="flex flex-col bg-white">
              {MOBILE_SHORTCUTS.map((item, i) => (
                <Link
                  key={item.key}
                  to={item.to}
                  className={`flex items-center gap-3 px-5 py-3.5 text-base text-text-body no-underline ${i < MOBILE_SHORTCUTS.length - 1 ? 'border-b border-border-list-item' : ''}`}
                >
                  <Icon name={item.icon} className={`text-xl ${item.colorClass}`} />
                  <span className="flex-1">{item.label}</span>
                  <Icon name="chevron_right" className="text-xl text-icon-arrow" />
                </Link>
              ))}
            </div>
            <div className="flex flex-col bg-white">
              <Link to="/settings/security" className="flex items-center gap-3 border-b border-border-list-item px-5 py-3.5 text-base text-text-body no-underline">
                <Icon name="security" className="text-xl text-[#7c5cf6]" />
                <span className="flex-1">账号与安全</span>
                <Icon name="chevron_right" className="text-xl text-icon-arrow" />
              </Link>
              <Link to="/settings/privacy" className="flex items-center gap-3 border-b border-border-list-item px-5 py-3.5 text-base text-text-body no-underline">
                <Icon name="lock" className="text-xl text-[#e2537a]" />
                <span className="flex-1">隐私</span>
                <Icon name="chevron_right" className="text-xl text-icon-arrow" />
              </Link>
              <button type="button" onClick={() => setMobileSubView(true)} className="flex items-center gap-3 px-5 py-3.5 text-left text-base text-text-body">
                <Icon name="settings" className="text-xl text-text-tertiary-3" />
                <span className="flex-1">设置</span>
                <Icon name="chevron_right" className="text-xl text-icon-arrow" />
              </button>
            </div>
          </div>
        </div>

        {/* Mobile "设置" sub-list (mock `07/1e`) -- a second, DIFFERENT grouping from both the hub
            above and the desktop directory: 清空缓存/意见反馈 sit here directly, not nested under
            通用. 清空缓存 links through to 通用 rather than duplicating that action (and its
            already-established "no fake byte count" honesty) in a second place; 意见反馈 has no
            generic post-login feedback endpoint anywhere in this protocol (the only feedback API,
            `/tenant-entry-feedback`, is unauthenticated and pre-login-only per its own name) so this
            is a real, recorded backend gap, not a missed wire-up. 关于 MeetingIM removed entirely per
            product decision -- its only real content was a version string and an update-check the
            backend rejects for `platform=web`, not worth a dedicated page. */}
        <div className={`flex-1 flex-col overflow-y-auto md:hidden ${mobileSubView ? 'flex' : 'hidden'}`}>
          <div className="grid h-12 flex-none grid-cols-[44px_1fr_44px] items-center bg-white px-1">
            <button type="button" onClick={() => setMobileSubView(false)} className="grid h-9 w-9 place-items-center text-text-heading">
              <Icon name="arrow_back_ios_new" className="text-[20px]" />
            </button>
            <strong className="text-center text-[17px] font-semibold text-text-heading">设置</strong>
            <span />
          </div>
          <div className="flex flex-col gap-2.5 py-2.5">
            <div className="flex flex-col bg-white">
              {DIRECTORY.filter((item) => item.key !== 'profile').map((item, i, arr) => (
                <Link
                  key={item.key}
                  to={item.to}
                  className={`flex items-center justify-between px-5 py-3.5 text-base text-text-body no-underline ${i < arr.length - 1 ? 'border-b border-border-list-item' : ''}`}
                >
                  <span>{item.label}</span>
                  <Icon name="chevron_right" className="text-xl text-icon-arrow" />
                </Link>
              ))}
            </div>
            <div className="flex flex-col bg-white">
              <Link to="/settings/general" className="flex items-center justify-between border-b border-border-list-item px-5 py-3.5 text-base text-text-body no-underline">
                <span>清空缓存</span>
                <Icon name="chevron_right" className="text-xl text-icon-arrow" />
              </Link>
              <button type="button" onClick={notImplemented} className="flex items-center justify-between px-5 py-3.5 text-left text-base text-text-body">
                <span>意见反馈</span>
                <Icon name="chevron_right" className="text-xl text-icon-arrow" />
              </button>
            </div>
            <button type="button" onClick={logout} disabled={loggingOut} className="bg-white py-3.5 text-center text-base text-danger-text disabled:opacity-50">
              退出登录
            </button>
          </div>
        </div>
      </aside>
      <div className={`h-full min-w-0 flex-1 flex-col overflow-y-auto bg-[#f6f7f9] md:flex ${showListOnNarrow ? 'hidden' : 'flex'}`}>
        <Link to="/settings" className="flex h-11 flex-none items-center gap-1 px-4 text-sm text-text-secondary no-underline md:hidden">
          <Icon name="arrow_back" className="text-[18px]" />
          设置
        </Link>
        <Outlet />
      </div>
    </div>
  );
}