import ExpandMore from "@mui/icons-material/ExpandMore";
import Inventory2Outlined from "@mui/icons-material/Inventory2Outlined";
import Logout from "@mui/icons-material/Logout";
import Menu from "@mui/icons-material/Menu";
import MenuOpen from "@mui/icons-material/MenuOpen";
import NotificationsNoneOutlined from "@mui/icons-material/NotificationsNoneOutlined";
import Person from "@mui/icons-material/Person";
import Refresh from "@mui/icons-material/Refresh";
import Search from "@mui/icons-material/Search";
import MuiMenu from "@mui/material/Menu";
import MenuItem from "@mui/material/MenuItem";
import TextField from "@mui/material/TextField";
import { lazy, Suspense, useEffect, useState } from "react";
import { useNavigate } from "react-router-dom";
import { useAppScope } from "@/app/app-scope/AppScopeProvider.jsx";
import { useAuth } from "@/app/auth/AuthProvider.jsx";
import { PERMISSIONS } from "@/app/permissions";
import { listNotifications } from "@/features/notifications/api";
import { useAdminQuery } from "@/shared/hooks/useAdminQuery.js";
import { IconButton } from "@/shared/ui/IconButton.jsx";
import { useToast } from "@/shared/ui/ToastProvider.jsx";

const SearchDialog = lazy(() => import("@/features/search/components/SearchDialog.jsx").then((module) => ({ default: module.SearchDialog })));

export function Header({ activeLabel, isSidebarCollapsed, onRefresh, onToggleSidebar }) {
  const [searchOpen, setSearchOpen] = useState(false);
  const [searchMounted, setSearchMounted] = useState(false);
  const [userMenuAnchor, setUserMenuAnchor] = useState(null);
  const navigate = useNavigate();
  const { can, logout, user } = useAuth();
  const appScope = useAppScope();
  const { showToast } = useToast();
  const ToggleIcon = isSidebarCollapsed ? MenuOpen : Menu;
  const userMenuOpen = Boolean(userMenuAnchor);
  const canViewNotifications = can(PERMISSIONS.notificationView);
  const { data: notificationState } = useAdminQuery(() => listNotifications(), {
    enabled: canViewNotifications,
    initialData: { items: [], unread: 0 },
    queryKey: ["notifications", "unread"],
    refetchInterval: 30000
  });
  const unread = notificationState?.unread || 0;

  useEffect(() => {
    if (searchOpen) {
      setSearchMounted(true);
      return undefined;
    }

    const timeout = window.setTimeout(() => setSearchMounted(false), 280);
    return () => window.clearTimeout(timeout);
  }, [searchOpen]);

  const openSearch = () => {
    setSearchMounted(true);
    setSearchOpen(true);
  };

  const closeUserMenu = () => {
    setUserMenuAnchor(null);
  };

  const handleLogout = async () => {
    closeUserMenu();
    await logout();
    navigate("/login", { replace: true });
  };

  const handleSearchSelect = (result) => {
    if (result?.target) {
      navigate(result.target);
    }
  };

  const openNotifications = () => {
    navigate("/notifications");
  };

  const refresh = () => {
    onRefresh();
    showToast("已刷新当前页面", "success");
  };

  return (
    <header className="header">
      <div className="brand">
        <div className="brand-mark">
          <Inventory2Outlined fontSize="small" />
        </div>
        <div className="brand-text">
          <span className="brand-title">HYApp 管理平台</span>
          <span className="brand-meta">Admin Platform</span>
        </div>
      </div>

      <div className="header-tools">
        <div className="header-left-tools">
          <IconButton label={isSidebarCollapsed ? "展开菜单" : "收起菜单"} onClick={onToggleSidebar}>
            <ToggleIcon fontSize="small" />
          </IconButton>
          <div className="header-location">{activeLabel}</div>
        </div>

        <div className="header-right-tools">
          <TextField
            className="app-switch"
            disabled={appScope.loading || !appScope.apps.length}
            select
            size="small"
            value={appScope.appCode}
            onChange={(event) => appScope.setAppCode(event.target.value)}
          >
            {appScope.apps.length ? (
              appScope.apps.map((app) => (
                <MenuItem key={app.appCode} value={app.appCode}>
                  {app.appName || app.appCode}
                </MenuItem>
              ))
            ) : (
              <MenuItem value={appScope.appCode}>{appScope.appCode}</MenuItem>
            )}
          </TextField>
          <button className="search-trigger" type="button" onClick={openSearch}>
            <Search fontSize="small" />
            <span>搜索用户、角色...</span>
          </button>
          <IconButton label="刷新" onClick={refresh}>
            <Refresh fontSize="small" />
          </IconButton>
          {canViewNotifications ? (
            <IconButton label="通知" notice={unread ? String(unread) : undefined} onClick={openNotifications}>
              <NotificationsNoneOutlined fontSize="small" />
            </IconButton>
          ) : null}
          <button className="user-pill" type="button" onClick={(event) => setUserMenuAnchor(event.currentTarget)}>
            <Person fontSize="small" />
            <span>{user?.name || user?.account || "admin"}</span>
            <ExpandMore fontSize="inherit" />
          </button>
          <MuiMenu
            anchorEl={userMenuAnchor}
            className="user-menu"
            onClose={closeUserMenu}
            open={userMenuOpen}
            transformOrigin={{ horizontal: "right", vertical: "top" }}
            anchorOrigin={{ horizontal: "right", vertical: "bottom" }}
          >
            <MenuItem className="user-menu__item" onClick={handleLogout}>
              <Logout fontSize="small" />
              退出
            </MenuItem>
          </MuiMenu>
        </div>
      </div>

      {searchMounted ? (
        <Suspense fallback={null}>
          <SearchDialog open={searchOpen} onClose={() => setSearchOpen(false)} onSelect={handleSearchSelect} />
        </Suspense>
      ) : null}
    </header>
  );
}