'use client';

import { useState, useEffect, useRef } from 'react';
import Link from 'next/link';
import { useRouter, usePathname } from 'next/navigation';
import { Bars3Icon, XMarkIcon, UserCircleIcon } from '@heroicons/react/24/outline';
import { motion, AnimatePresence, useScroll, useTransform, useSpring } from 'framer-motion';
import { useAuth } from '@/contexts/AuthContext';

export default function Navbar() {
  const [isOpen, setIsOpen] = useState(false);
  const [isHidden, setIsHidden] = useState(false);
  const [isScrolled, setIsScrolled] = useState(false);
  const [showScrollTop, setShowScrollTop] = useState(false);
  const [navbarHeight, setNavbarHeight] = useState(0);
  const [scrollProgress, setScrollProgress] = useState(0);
  const navbarRef = useRef<HTMLElement>(null);
  const { user, isAuthenticated, logout } = useAuth();
  const router = useRouter();
  const pathname = usePathname();
  const { scrollY } = useScroll();
  
  // 弹簧动画效果
  const springConfig = { stiffness: 300, damping: 30 };
  const navbarY = useSpring(useTransform(scrollY, [0, 100], [0, -100]), springConfig);
  const navbarOpacity = useSpring(useTransform(scrollY, [0, 50], [1, 0.95]), springConfig);
  const scrollProgressSpring = useSpring(scrollProgress, springConfig);

  // 在auth页面隐藏navbar
  const isAuthPage = pathname === '/auth';

  // 检测navbar高度并设置CSS自定义属性
  useEffect(() => {
    const updateHeight = () => {
      if (navbarRef.current) {
        const height = navbarRef.current.offsetHeight;
        setNavbarHeight(height);
        document.documentElement.style.setProperty('--navbar-height', `${height}px`);
      }
    };

    updateHeight();
    window.addEventListener('resize', updateHeight);
    return () => window.removeEventListener('resize', updateHeight);
  }, []);

  // 滚动进度计算
  useEffect(() => {
    const handleScroll = () => {
      const scrollTop = window.scrollY;
      const docHeight = document.documentElement.scrollHeight - window.innerHeight;
      const progress = docHeight > 0 ? (scrollTop / docHeight) * 100 : 0;
      setScrollProgress(progress);
    };

    window.addEventListener('scroll', handleScroll, { passive: true });
    return () => window.removeEventListener('scroll', handleScroll);
  }, []);

  useEffect(() => {
    let lastScrollY = 0;
    let ticking = false;
    
    const handleScroll = () => {
      if (!ticking) {
        window.requestAnimationFrame(() => {
          const currentScrollY = window.scrollY;
          
          // 检测是否滚动到顶部
          setIsScrolled(currentScrollY > 20);
          
          // 显示返回顶部按钮（滚动超过300px）
          setShowScrollTop(currentScrollY > 300);
          
          // 更敏感的隐藏逻辑：只要往下滚动就隐藏，不管滚动多少
          if (!isAuthPage && currentScrollY > lastScrollY && currentScrollY > 10) {
            setIsHidden(true);
          } else if (currentScrollY < lastScrollY) { // 往上滚动就显示
            setIsHidden(false);
          }
          
          lastScrollY = currentScrollY;
          ticking = false;
        });
        ticking = true;
      }
    };

    if (!isAuthPage) {
      window.addEventListener('scroll', handleScroll, { passive: true });
    }
    
    return () => window.removeEventListener('scroll', handleScroll);
  }, [isAuthPage]);

  const handleLogout = () => {
    logout();
    router.push('/');
    setIsOpen(false);
  };

  const handleLinkClick = () => {
    setIsOpen(false);
  };

  // 在auth页面不渲染navbar
  if (isAuthPage) {
    return null;
  }

  const scrollToTop = () => {
    window.scrollTo({
      top: 0,
      behavior: 'smooth',
    });
  };

  const navItems = [
    { href: '/', label: '首页', icon: null },
    { href: '/skins', label: '皮肤库', icon: null },
  ];

  return (
    <>
      <motion.nav
        ref={navbarRef}
        style={{ 
          y: isHidden ? navbarY : 0,
          opacity: navbarOpacity,
          willChange: 'transform, opacity'
        }}
        initial={{ y: 0 }}
        animate={{ y: isHidden ? -100 : 0 }}
        transition={{ duration: 0.3, ease: 'easeInOut' }}
        className="fixed top-0 left-0 right-0 z-50 transition-all duration-300 bg-white/80 dark:bg-gray-800/80 backdrop-blur-lg border-b border-gray-200/50 dark:border-gray-700/50"
      >
        {/* 滚动进度条 */}
        <motion.div
          className="absolute bottom-0 left-0 h-0.5 bg-gradient-to-r from-orange-400 to-amber-500"
          style={{ width: `${scrollProgress}%` }}
          initial={{ width: 0 }}
          animate={{ width: `${scrollProgress}%` }}
          transition={{ duration: 0.1 }}
        />
        
        <div className={`
          max-w-7xl mx-auto px-4 sm:px-6 lg:px-8
          ${isScrolled ? 'py-3' : 'py-4'}
          transition-all duration-300
        `}>
          <div className="flex justify-between items-center">
            {/* Logo */}
            <motion.div 
              className="flex items-center"
              whileHover={{ scale: 1.02 }}
              whileTap={{ scale: 0.98 }}
            >
              <Link href="/" className="flex items-center space-x-3 group">
                <motion.div 
                  className="w-10 h-10 bg-gradient-to-br from-orange-400 via-orange-500 to-orange-600 rounded-xl flex items-center justify-center shadow-lg relative overflow-hidden"
                  whileHover={{ rotate: 5, scale: 1.05 }}
                  transition={{ type: 'spring', stiffness: 300 }}
                >
                  <span className="text-white font-bold text-lg relative z-10">C</span>
                  <motion.div
                    className="absolute inset-0 bg-gradient-to-br from-white/20 to-transparent"
                    initial={{ x: '-100%', y: '-100%' }}
                    whileHover={{ x: '100%', y: '100%' }}
                    transition={{ duration: 0.6 }}
                  />
                </motion.div>
                <motion.span 
                  className="text-2xl font-black bg-gradient-to-r from-orange-400 to-orange-600 bg-clip-text text-transparent"
                  whileHover={{ scale: 1.02 }}
                >
                  CarrotSkin
                </motion.span>
              </Link>
            </motion.div>

            {/* Desktop Navigation */}
            <div className="hidden md:flex items-center space-x-6">
              {navItems.map((item, index) => (
                <motion.div 
                  key={item.href}
                  initial={{ opacity: 0, y: -10 }}
                  animate={{ opacity: 1, y: 0 }}
                  transition={{ delay: index * 0.1 }}
                  whileHover={{ scale: 1.02 }} 
                  whileTap={{ scale: 0.98 }}
                >
                  <Link 
                    href={item.href} 
                    className="text-gray-700 dark:text-gray-300 hover:text-orange-500 dark:hover:text-orange-400 transition-all duration-200 font-medium relative group px-3 py-2 rounded-lg hover:bg-orange-500/10 dark:hover:bg-orange-400/10"
                  >
                    {item.label}
                    <motion.span 
                      className="absolute -bottom-0.5 left-3 right-3 h-0.5 bg-gradient-to-r from-orange-400 to-orange-600"
                      initial={{ scaleX: 0 }}
                      whileHover={{ scaleX: 1 }}
                      transition={{ duration: 0.2 }}
                    />
                    {pathname === item.href && (
                      <motion.span 
                        className="absolute -bottom-0.5 left-3 right-3 h-0.5 bg-gradient-to-r from-orange-400 to-orange-600"
                        initial={{ scaleX: 0 }}
                        animate={{ scaleX: 1 }}
                        transition={{ duration: 0.2 }}
                      />
                    )}
                  </Link>
                </motion.div>
              ))}
              
              {/* 用户头像框 - 增强的微交互 */}
              {isAuthenticated ? (
                <div className="flex items-center space-x-4">
                  <motion.div 
                    whileHover={{ scale: 1.05 }} 
                    whileTap={{ scale: 0.95 }}
                    initial={{ opacity: 0, scale: 0.8 }}
                    animate={{ opacity: 1, scale: 1 }}
                    transition={{ delay: 0.2 }}
                  >
                    <Link 
                      href="/profile" 
                      className="flex items-center space-x-3 group"
                      onClick={handleLinkClick}
                    >
                      {user?.avatar ? (
                        <motion.div 
                          className="relative"
                          whileHover={{ scale: 1.1, rotate: 5 }}
                        >
                          <img 
                            src={user.avatar} 
                            alt={user.username}
                            className="w-9 h-9 rounded-full border-2 border-orange-500/30 group-hover:border-orange-500 transition-all duration-200 shadow-md"
                          />
                          <motion.div 
                            className="absolute inset-0 rounded-full bg-gradient-to-br from-orange-400/20 to-orange-600/20"
                            initial={{ opacity: 0 }}
                            whileHover={{ opacity: 1 }}
                            transition={{ duration: 0.2 }}
                          />
                          <motion.div
                            className="absolute -inset-1 rounded-full border-2 border-orange-400/50"
                            initial={{ scale: 0.8, opacity: 0 }}
                            whileHover={{ scale: 1.2, opacity: 1 }}
                            transition={{ duration: 0.3 }}
                          />
                        </motion.div>
                      ) : (
                        <motion.div 
                          className="relative"
                          whileHover={{ scale: 1.1, rotate: 5 }}
                        >
                          <UserCircleIcon className="w-9 h-9 text-gray-400 group-hover:text-orange-500 transition-all duration-200" />
                          <motion.div 
                            className="absolute inset-0 rounded-full bg-gradient-to-br from-orange-400/20 to-orange-600/20"
                            initial={{ opacity: 0 }}
                            whileHover={{ opacity: 1 }}
                            transition={{ duration: 0.2 }}
                          />
                        </motion.div>
                      )}
                      <motion.span 
                        className="text-gray-700 dark:text-gray-300 group-hover:text-orange-500 dark:group-hover:text-orange-400 transition-all duration-200 font-medium"
                        whileHover={{ scale: 1.02 }}
                      >
                        {user?.username}
                      </motion.span>
                    </Link>
                  </motion.div>
                  
                  <motion.button 
                    onClick={handleLogout}
                    className="relative overflow-hidden border-2 border-orange-500 text-orange-500 hover:text-white font-medium py-2 px-4 rounded-lg transition-all duration-200 group"
                    whileHover={{ scale: 1.02 }}
                    whileTap={{ scale: 0.98 }}
                    initial={{ opacity: 0, x: 10 }}
                    animate={{ opacity: 1, x: 0 }}
                    transition={{ delay: 0.3 }}
                  >
                    <motion.span 
                      className="absolute inset-0 w-0 bg-gradient-to-r from-orange-400 to-orange-600 transition-all duration-300 group-hover:w-full"
                      initial={{ width: 0 }}
                      whileHover={{ width: '100%' }}
                    />
                    <span className="relative z-10">退出登录</span>
                  </motion.button>
                </div>
              ) : (
                <motion.div 
                  whileHover={{ scale: 1.02 }} 
                  whileTap={{ scale: 0.98 }}
                  initial={{ opacity: 0, x: 10 }}
                  animate={{ opacity: 1, x: 0 }}
                  transition={{ delay: 0.2 }}
                >
                  <Link 
                    href="/auth" 
                    className="flex items-center space-x-2 text-gray-700 dark:text-gray-300 hover:text-orange-500 dark:hover:text-orange-400 transition-all duration-200 group"
                  >
                    <motion.div 
                      className="relative"
                      whileHover={{ scale: 1.1, rotate: 10 }}
                    >
                      <UserCircleIcon className="w-7 h-7 text-gray-400 group-hover:text-orange-500 transition-all duration-200" />
                      <motion.div 
                        className="absolute inset-0 rounded-full bg-gradient-to-br from-orange-400/20 to-orange-600/20"
                        initial={{ opacity: 0 }}
                        whileHover={{ opacity: 1 }}
                        transition={{ duration: 0.2 }}
                      />
                    </motion.div>
                    <span className="font-medium">登录</span>
                  </Link>
                </motion.div>
              )}
            </div>

            {/* Mobile menu button */}
            <div className="md:hidden flex items-center">
              <motion.button
                onClick={() => setIsOpen(!isOpen)}
                className="text-gray-700 dark:text-gray-300 hover:text-orange-500 dark:hover:text-orange-400 transition-colors duration-200 p-2"
                whileHover={{ scale: 1.1 }}
                whileTap={{ scale: 0.9 }}
                animate={{ rotate: isOpen ? 180 : 0 }}
                transition={{ duration: 0.3 }}
              >
                <AnimatePresence mode="wait">
                  {isOpen ? (
                    <motion.div
                      key="close"
                      initial={{ rotate: -90, opacity: 0 }}
                      animate={{ rotate: 0, opacity: 1 }}
                      exit={{ rotate: 90, opacity: 0 }}
                      transition={{ duration: 0.2 }}
                    >
                      <XMarkIcon className="w-6 h-6" />
                    </motion.div>
                  ) : (
                    <motion.div
                      key="open"
                      initial={{ rotate: 90, opacity: 0 }}
                      animate={{ rotate: 0, opacity: 1 }}
                      exit={{ rotate: -90, opacity: 0 }}
                      transition={{ duration: 0.2 }}
                    >
                      <Bars3Icon className="w-6 h-6" />
                    </motion.div>
                  )}
                </AnimatePresence>
              </motion.button>
            </div>
          </div>
        </div>

        {/* Mobile Navigation */}
        <AnimatePresence>
          {isOpen && (
            <motion.div
              initial={{ opacity: 0, height: 0 }}
              animate={{ opacity: 1, height: 'auto' }}
              exit={{ opacity: 0, height: 0 }}
              transition={{ duration: 0.3, ease: 'easeInOut' }}
              className="md:hidden bg-white/95 dark:bg-gray-900/95 backdrop-blur-md border-t border-gray-200/50 dark:border-gray-700/50 overflow-hidden"
            >
              <div className="px-4 py-4 space-y-1">
                {navItems.map((item, index) => (
                  <motion.div
                    key={item.href}
                    initial={{ opacity: 0, x: -20 }}
                    animate={{ opacity: 1, x: 0 }}
                    transition={{ delay: index * 0.05 }}
                  >
                    <Link 
                      href={item.href} 
                      className="block px-4 py-3 text-gray-700 dark:text-gray-300 hover:text-orange-500 dark:hover:text-orange-400 hover:bg-orange-500/10 dark:hover:bg-orange-400/10 rounded-lg transition-all duration-200 font-medium"
                      onClick={handleLinkClick}
                    >
                      {item.label}
                    </Link>
                  </motion.div>
                ))}
                
                {isAuthenticated ? (
                  <>
                    <motion.div
                      initial={{ opacity: 0, x: -20 }}
                      animate={{ opacity: 1, x: 0 }}
                      transition={{ delay: 0.2 }}
                    >
                      <Link 
                        href="/profile" 
                        className="block px-4 py-3 hover:bg-orange-500/10 dark:hover:bg-orange-400/10 rounded-lg transition-all duration-200"
                        onClick={handleLinkClick}
                      >
                        <div className="flex items-center space-x-3">
                          {user?.avatar ? (
                            <img 
                              src={user.avatar} 
                              alt={user.username}
                              className="w-8 h-8 rounded-full border-2 border-orange-500/30"
                            />
                          ) : (
                            <UserCircleIcon className="w-8 h-8 text-gray-400" />
                          )}
                          <span className="text-gray-700 dark:text-gray-300 font-medium">{user?.username}</span>
                        </div>
                      </Link>
                    </motion.div>
                    
                    <motion.div
                      initial={{ opacity: 0, x: -20 }}
                      animate={{ opacity: 1, x: 0 }}
                      transition={{ delay: 0.25 }}
                    >
                      <button 
                        onClick={handleLogout}
                        className="block w-full text-left px-4 py-3 text-gray-700 dark:text-gray-300 hover:text-orange-500 dark:hover:text-orange-400 hover:bg-orange-500/10 dark:hover:bg-orange-400/10 rounded-lg transition-all duration-200 font-medium"
                      >
                        退出登录
                      </button>
                    </motion.div>
                  </>
                ) : (
                  <>
                    <motion.div
                      initial={{ opacity: 0, x: -20 }}
                      animate={{ opacity: 1, x: 0 }}
                      transition={{ delay: 0.2 }}
                    >
                      <Link 
                        href="/auth" 
                        className="block px-4 py-3 text-gray-700 dark:text-gray-300 hover:text-orange-500 dark:hover:text-orange-400 hover:bg-orange-500/10 dark:hover:bg-orange-400/10 rounded-lg transition-all duration-200 font-medium"
                        onClick={handleLinkClick}
                      >
                        登录
                      </Link>
                    </motion.div>
                    
                    <motion.div
                      initial={{ opacity: 0, x: -20 }}
                      animate={{ opacity: 1, x: 0 }}
                      transition={{ delay: 0.25 }}
                    >
                      <Link 
                        href="/auth" 
                        className="block px-4 py-3 bg-gradient-to-r from-orange-500 to-orange-600 hover:from-orange-600 hover:to-orange-700 text-white rounded-lg transition-all duration-200 shadow-lg hover:shadow-xl font-medium text-center"
                        onClick={handleLinkClick}
                      >
                        注册
                      </Link>
                    </motion.div>
                  </>
                )}
              </div>
            </motion.div>
          )}
        </AnimatePresence>
      </motion.nav>

      {/* 返回顶部按钮 */}
      <AnimatePresence>
        {showScrollTop && (
          <motion.button
            initial={{ opacity: 0, scale: 0.8, y: 20 }}
            animate={{ opacity: 1, scale: 1, y: 0 }}
            exit={{ opacity: 0, scale: 0.8, y: 20 }}
            whileHover={{ scale: 1.1, y: -2 }}
            whileTap={{ scale: 0.9 }}
            onClick={scrollToTop}
            className="fixed bottom-8 right-8 z-40 bg-gradient-to-r from-orange-500 to-amber-500 text-white p-3 rounded-full shadow-lg hover:shadow-xl transition-all duration-200"
          >
            <motion.div
              animate={{ y: [0, -3, 0] }}
              transition={{ duration: 1.5, repeat: Infinity }}
            >
              <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M5 10l7-7m0 0l7 7m-7-7v18" />
              </svg>
            </motion.div>
          </motion.button>
        )}
      </AnimatePresence>
    </>
  );
}