import { useState } from 'react';
import { useNavigate } from 'react-router-dom';
import { Shield, Database, Code, GitBranch, Bell, History, UserCog, Sparkles, Sun, Moon } from 'lucide-react';
import { useTheme } from '@/hooks/useTheme';
import { useAuth } from '@/hooks/useAuth';

export default function LoginPage() {
  const navigate = useNavigate();
  const { theme, toggleTheme } = useTheme();
  const { login } = useAuth();
  const [username, setUsername] = useState('');
  const [password, setPassword] = useState('');
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState('');

  const handleLogin = async (e: React.FormEvent) => {
    e.preventDefault();
    if (!username || !password) return;
    setLoading(true);
    setError('');
    const ok = await login(username, password);
    setLoading(false);
    if (ok) {
      navigate('/dashboard');
    } else {
      setError('用户名或密码错误');
    }
  };

  const features = [
    { icon: Database, title: '多数据库支持', desc: 'MySQL、PostgreSQL、Redis、MongoDB' },
    { icon: Code, title: '智能 SQL 审核', desc: '语法检查、规则校验、影响分析、自动评分' },
    { icon: GitBranch, title: '多级审批流程', desc: '会签、或签、条件审批灵活配置' },
    { icon: Bell, title: '多渠道通知', desc: '飞书、钉钉、企微、TG 即时推送' },
    { icon: History, title: '完整审计追踪', desc: '所有操作可追溯，支持 SQL 回滚' },
    { icon: UserCog, title: '细粒度权限', desc: 'RBAC 角色权限，字段级/行级访问控制' },
  ];

  return (
    <div className="min-h-screen flex bg-[var(--dg-bg-primary)] relative overflow-hidden">
      {/* 背景装饰 */}
      <div className="absolute inset-0 pointer-events-none">
        <div className="absolute top-0 left-0 w-full h-full bg-[radial-gradient(ellipse_at_20%_20%,rgba(88,166,255,0.08)_0%,transparent_50%),radial-gradient(ellipse_at_80%_80%,rgba(137,87,229,0.08)_0%,transparent_50%)]" />
      </div>
      {/* 主题切换 */}
      <button
        onClick={toggleTheme}
        className="absolute top-5 right-5 z-20 w-10 h-10 rounded-xl bg-[var(--dg-bg-tertiary)] border border-[var(--dg-border)] flex items-center justify-center text-[var(--dg-text-secondary)] hover:text-[var(--dg-text-primary)] hover:bg-[var(--dg-bg-hover)] transition-colors"
        title={theme === 'dark' ? '切换到浅色模式' : '切换到深色模式'}
      >
        {theme === 'dark' ? <Sun className="w-5 h-5" /> : <Moon className="w-5 h-5" />}
      </button>

      {/* 左侧 */}
      <div className="flex-1 flex flex-col justify-center px-16 relative z-10">
        <div className="mb-10">
          <div className="flex items-center gap-3 mb-6">
            <div className="w-12 h-12 rounded-xl dg-gradient-br flex items-center justify-center">
              <Shield className="w-7 h-7 text-white" />
            </div>
            <h1 className="text-5xl font-bold dg-gradient-text">
              SQL-Platform
            </h1>
          </div>
          <p className="text-lg text-[var(--dg-text-secondary)] leading-relaxed">
            企业级数据审核与变更管理平台<br />
            支持多数据库类型，提供完善的 SQL 审核、审批流程和审计追踪
          </p>
        </div>

        <div className="grid grid-cols-2 gap-4">
          {features.map((f, i) => (
            <div key={i} className="flex items-start gap-3 p-4 rounded-xl bg-[var(--dg-bg-secondary)]/60 border border-[var(--dg-border)] hover:border-blue-500/50 hover:bg-[var(--dg-bg-secondary)] transition-all group">
              <f.icon className="w-6 h-6 text-blue-400 mt-0.5 flex-shrink-0 group-hover:scale-110 transition-transform" />
              <div>
                <h4 className="text-sm font-semibold mb-1">{f.title}</h4>
                <p className="text-xs text-[var(--dg-text-secondary)]">{f.desc}</p>
              </div>
            </div>
          ))}
        </div>
      </div>

      {/* 右侧 */}
      <div className="w-[480px] flex flex-col justify-center px-16 bg-[var(--dg-bg-secondary)]/80 backdrop-blur-xl border-l border-[var(--dg-border)] relative z-10">
        <div className="w-full max-w-sm mx-auto">
          <div className="flex items-center gap-2 mb-2">
            <Sparkles className="w-5 h-5 text-blue-400" />
            <h2 className="text-2xl font-bold">欢迎回来</h2>
          </div>
          <p className="text-sm text-[var(--dg-text-secondary)] mb-8">请登录您的账户以继续</p>

          <form onSubmit={handleLogin} className="space-y-4">
            <div>
              <label className="block text-sm font-medium mb-2">用户名 / 邮箱</label>
              <div className="relative">
                <UserCog className="absolute left-3.5 top-1/2 -translate-y-1/2 w-4 h-4 text-[var(--dg-text-muted)]" />
                <input
                  className="w-full pl-10 pr-4 py-3 bg-[var(--dg-bg-tertiary)] border border-[var(--dg-border)] rounded-lg text-sm focus:border-blue-400 focus:outline-none focus:ring-1 focus:ring-blue-400/20 transition-all"
                  placeholder="admin"
                  value={username}
                  onChange={e => setUsername(e.target.value)}
                />
              </div>
            </div>
            <div>
              <label className="block text-sm font-medium mb-2">密码</label>
              <div className="relative">
                <Shield className="absolute left-3.5 top-1/2 -translate-y-1/2 w-4 h-4 text-[var(--dg-text-muted)]" />
                <input
                  type="password"
                  className="w-full pl-10 pr-4 py-3 bg-[var(--dg-bg-tertiary)] border border-[var(--dg-border)] rounded-lg text-sm focus:border-blue-400 focus:outline-none focus:ring-1 focus:ring-blue-400/20 transition-all"
                  placeholder="123456"
                  value={password}
                  onChange={e => setPassword(e.target.value)}
                />
              </div>
            </div>
            <button
              type="submit"
              disabled={loading || !username || !password}
              className="w-full py-3 dg-gradient-bg rounded-lg text-sm font-semibold text-white hover:opacity-90 disabled:opacity-50 disabled:cursor-not-allowed transition-all flex items-center justify-center gap-2"
            >
              {loading ? (
                <div className="w-5 h-5 border-2 border-white/30 border-t-white rounded-full animate-spin" />
              ) : '登录'}
            </button>
            {error && <p className="text-xs text-red-400 text-center mt-2">{error}</p>}
          </form>

          <div className="mt-6 p-3 rounded-lg bg-[var(--dg-bg-tertiary)] border border-[var(--dg-border)]">
            <p className="text-xs text-[var(--dg-text-muted)] text-center">演示账号</p>
            <div className="flex gap-2 mt-2">
              <button onClick={() => { setUsername('admin'); setPassword('123456'); }} className="flex-1 py-2 text-xs rounded-md bg-blue-500/10 text-blue-400 border border-blue-500/20 hover:bg-blue-500/20 transition-colors">
                管理员
              </button>
              <button onClick={() => { setUsername('developer'); setPassword('123456'); }} className="flex-1 py-2 text-xs rounded-md bg-green-500/10 text-green-400 border border-green-500/20 hover:bg-green-500/20 transition-colors">
                开发者
              </button>
            </div>
          </div>
        </div>
      </div>
    </div>
  );
}