import { useEffect, useRef, useState } from 'react';
import { Link, useLocation, useNavigate } from 'react-router-dom';
import { motion, AnimatePresence } from 'framer-motion';
import { useAuth } from '@/hooks/useAuth';
import { APP_NAME } from '@/utils/constants';
import { BrandLogo } from '@/components/BrandLogo';
import { ClipboardList, LogOut, Moon, NotebookPen, Sun, User } from 'lucide-react';
import { MOTION_DURATION, MOTION_EASE, fastTransition } from '@/lib/motion';
import { useTheme } from '@/hooks/useTheme';
import { cn } from '@/lib/utils';

/**
 * Minimal top shell: product mark + profile menu (Course Status, Logout).
 * Replaces the former bottom navigation.
 */
export function AppHeader() {
  const { isAuthenticated, signOut, isGuest, user } = useAuth();
  const { toggleTheme, isDark } = useTheme();
  const navigate = useNavigate();
  const location = useLocation();
  const [menuOpen, setMenuOpen] = useState(false);
  const [showLogoutConfirm, setShowLogoutConfirm] = useState(false);
  const menuRef = useRef<HTMLDivElement>(null);

  const isAuthPage = location.pathname === '/login' || location.pathname === '/signup';
  const usernameLabel = isGuest
    ? 'مهمان'
    : user?.email?.trim() || 'کاربر';

  useEffect(() => {
    setMenuOpen(false);
  }, [location.pathname]);

  useEffect(() => {
    if (!menuOpen) return;

    const onPointerDown = (event: MouseEvent) => {
      if (menuRef.current && !menuRef.current.contains(event.target as Node)) {
        setMenuOpen(false);
      }
    };

    const onKeyDown = (event: KeyboardEvent) => {
      if (event.key === 'Escape') setMenuOpen(false);
    };

    document.addEventListener('mousedown', onPointerDown);
    document.addEventListener('keydown', onKeyDown);
    return () => {
      document.removeEventListener('mousedown', onPointerDown);
      document.removeEventListener('keydown', onKeyDown);
    };
  }, [menuOpen]);

  const handleSignOut = async () => {
    await signOut();
    setShowLogoutConfirm(false);
    setMenuOpen(false);
    navigate('/login', { replace: true });
  };

  if (isAuthPage || (!isAuthenticated && !isGuest)) {
    return null;
  }

  return (
    <>
      <header className="app-header">
        <div className="mx-auto flex h-14 w-full items-center justify-between gap-3 px-4">
          <Link
            to="/"
            className="inline-flex shrink-0 items-center transition-opacity duration-300 hover:opacity-90"
            aria-label={APP_NAME}
          >
            <BrandLogo imgClassName="h-7 sm:h-8" />
          </Link>

          <div className="relative" ref={menuRef}>
            <motion.button
              type="button"
              onClick={() => setMenuOpen((open) => !open)}
              whileHover={{ scale: 1.04 }}
              whileTap={{ scale: 0.96 }}
              transition={fastTransition}
              className={cn(
                'inline-flex h-9 w-9 items-center justify-center rounded-full border transition-colors duration-200',
                'border-slate-200 bg-white text-sky-700 shadow-sm',
                'hover:border-sky-300 hover:bg-sky-50 hover:text-sky-800',
                'dark:border-slate-600/60 dark:bg-slate-800 dark:text-sky-300 dark:shadow-none',
                'dark:hover:border-slate-500 dark:hover:bg-slate-700 dark:hover:text-sky-200',
                menuOpen && 'border-sky-400 ring-2 ring-sky-400/25 dark:border-sky-500 dark:ring-sky-500/20'
              )}
              aria-label="منوی پروفایل"
              aria-expanded={menuOpen}
              aria-haspopup="menu"
            >
              <User className="h-4 w-4" />
            </motion.button>

            <AnimatePresence>
              {menuOpen && (
                <motion.div
                  key="menu-panel"
                  role="menu"
                  initial={{ opacity: 0, scale: 0.96, y: -4 }}
                  animate={{ opacity: 1, scale: 1, y: 0 }}
                  exit={{ opacity: 0, scale: 0.96, y: -4 }}
                  transition={{ duration: MOTION_DURATION.fast, ease: MOTION_EASE }}
                  className="header-menu-panel"
                >
                  <div className="header-menu-identity" aria-label="نام کاربری">
                    <p className="text-[11px] font-medium text-muted-foreground">نام کاربری</p>
                    <p
                      className="truncate text-sm font-semibold text-foreground"
                      title={usernameLabel}
                      dir="ltr"
                    >
                      {usernameLabel}
                    </p>
                  </div>
                  <Link
                    to="/course-status"
                    role="menuitem"
                    className="header-menu-item"
                    onClick={() => setMenuOpen(false)}
                  >
                    <ClipboardList className="h-4 w-4 shrink-0 text-sky-600 dark:text-sky-400" />
                    وضعیت دوره
                  </Link>
                  <Link
                    to="/assignments"
                    role="menuitem"
                    className="header-menu-item"
                    onClick={() => setMenuOpen(false)}
                  >
                    <NotebookPen className="h-4 w-4 shrink-0 text-sky-600 dark:text-sky-400" />
                    تکالیف من
                  </Link>
                  {user?.role === 'admin' ? (
                    <Link
                      to="/admin"
                      role="menuitem"
                      className="header-menu-item"
                      onClick={() => setMenuOpen(false)}
                    >
                      <ClipboardList className="h-4 w-4 shrink-0 text-sky-600 dark:text-sky-400" />
                      پنل ادمین
                    </Link>
                  ) : null}
                  <button
                    type="button"
                    role="menuitem"
                    className="header-menu-item"
                    onClick={toggleTheme}
                  >
                    {isDark ? (
                      <Sun className="h-4 w-4 shrink-0 text-sky-600 dark:text-sky-400" />
                    ) : (
                      <Moon className="h-4 w-4 shrink-0 text-sky-600 dark:text-sky-400" />
                    )}
                    {isDark ? 'حالت روشن' : 'حالت تاریک'}
                  </button>
                  <button
                    type="button"
                    role="menuitem"
                    className="header-menu-item header-menu-item-danger"
                    onClick={() => {
                      setMenuOpen(false);
                      setShowLogoutConfirm(true);
                    }}
                  >
                    <LogOut className="h-4 w-4 shrink-0" />
                    خروج
                  </button>
                </motion.div>
              )}
            </AnimatePresence>
          </div>
        </div>
      </header>

      {showLogoutConfirm && (
        <div className="fixed inset-0 z-[60] flex items-end justify-center bg-slate-900/50 p-4 backdrop-blur-md sm:items-center">
          <div className="glass-panel-strong w-full max-w-sm space-y-4 p-6">
            <h3 className="text-lg font-semibold text-foreground">خروج از حساب کاربری</h3>
            <p className="text-sm leading-relaxed text-body">آیا مطمئن هستید که می‌خواهید خارج شوید؟</p>
            <div className="flex gap-3">
              <button
                type="button"
                onClick={() => setShowLogoutConfirm(false)}
                className="btn-glass flex-1"
              >
                انصراف
              </button>
              <button type="button" onClick={handleSignOut} className="btn-danger-neon flex-1">
                خروج
              </button>
            </div>
          </div>
        </div>
      )}
    </>
  );
}