'use client';
import { useState, useEffect } from 'react';
import Link from 'next/link';
import { usePathname } from 'next/navigation';
import { useAuth } from '@/lib/auth';
import {
  LayoutDashboard, TrendingUp, KeyRound, Bot, Settings, User, LogOut, Menu, ShieldCheck,
} from 'lucide-react';
import { cn } from '@/lib/cn';

const NAV: { href: string; label: string; icon: any; adminOnly?: boolean }[] = [
  { href: '/',             label: '대시보드',     icon: LayoutDashboard },
  { href: '/trades',       label: '트레이드 이력', icon: TrendingUp },
  { href: '/exchange',     label: '거래소 API',   icon: KeyRound },
  { href: '/automation',   label: '자동매매',     icon: Bot },
  { href: '/settings',     label: '시스템 설정',  icon: Settings },
  { href: '/profile',      label: '내 정보',      icon: User },
  { href: '/admin/users',  label: '사용자 관리',  icon: ShieldCheck, adminOnly: true },
];

const Logo = ({ mini = false }: { mini?: boolean }) => {
  if (mini) {
    return (
      <svg viewBox="0 0 64 64" width={40} height={40} xmlns="http://www.w3.org/2000/svg">
        <defs>
          <radialGradient id="mLogoMini" cx="35%" cy="30%">
            <stop offset="0%" stopColor="#fef3c7"/>
            <stop offset="45%" stopColor="#fbbf24"/>
            <stop offset="100%" stopColor="#b45309"/>
          </radialGradient>
        </defs>
        <circle cx="40" cy="38" r="20" fill="url(#mLogoMini)" opacity="0.35"/>
        <circle cx="32" cy="32" r="24" fill="url(#mLogoMini)" stroke="#92400e" strokeWidth="2"/>
        <circle cx="32" cy="32" r="18" fill="none" stroke="rgba(255,255,255,0.45)" strokeWidth="1.2"/>
        <text x="32" y="42" textAnchor="middle" fontFamily="'Arial Black', Impact, sans-serif" fontWeight="900" fontSize="32" fill="#7c2d12">$</text>
      </svg>
    );
  }
  return (
    <svg viewBox="0 0 280 64" width={220} height={50} xmlns="http://www.w3.org/2000/svg">
      <defs>
        <radialGradient id="coinFace" cx="35%" cy="30%">
          <stop offset="0%" stopColor="#fef3c7"/>
          <stop offset="45%" stopColor="#fbbf24"/>
          <stop offset="100%" stopColor="#b45309"/>
        </radialGradient>
        <linearGradient id="coinEdge" x1="0" y1="0" x2="0" y2="1">
          <stop offset="0%" stopColor="#fde047"/>
          <stop offset="100%" stopColor="#92400e"/>
        </linearGradient>
        <linearGradient id="brandGold" x1="0" y1="0" x2="1" y2="0">
          <stop offset="0%" stopColor="#fbbf24"/>
          <stop offset="50%" stopColor="#fde68a"/>
          <stop offset="100%" stopColor="#f59e0b"/>
        </linearGradient>
        <filter id="logoGlow" x="-20%" y="-20%" width="140%" height="140%">
          <feGaussianBlur stdDeviation="1.2" result="b"/>
          <feMerge><feMergeNode in="b"/><feMergeNode in="SourceGraphic"/></feMerge>
        </filter>
      </defs>
      <g transform="translate(8, 14)">
        <ellipse cx="30" cy="24" rx="14" ry="14" fill="url(#coinFace)" opacity="0.3"/>
        <ellipse cx="23" cy="20" rx="14" ry="14" fill="url(#coinFace)" opacity="0.6" stroke="url(#coinEdge)" strokeWidth="0.5"/>
        <circle cx="16" cy="16" r="15.5" fill="url(#coinFace)" stroke="url(#coinEdge)" strokeWidth="1.2"/>
        <circle cx="16" cy="16" r="12" fill="none" stroke="rgba(255,255,255,0.4)" strokeWidth="0.7"/>
        <text x="16" y="22.5" textAnchor="middle" fontFamily="'Arial Black', Impact, sans-serif" fontWeight="900" fontSize="20" fill="#7c2d12" filter="url(#logoGlow)">$</text>
        <path d="M 38 6 L 48 -2 L 42 -2 M 48 -2 L 48 4" stroke="#10b981" strokeWidth="2.4" fill="none" strokeLinecap="round" strokeLinejoin="round"/>
        <g fill="#fde68a">
          <circle cx="40" cy="16" r="0.9"/>
          <circle cx="46" cy="11" r="1.1"/>
          <circle cx="43" cy="22" r="0.7"/>
        </g>
      </g>
      <text x="66" y="30" fontFamily="Pretendard, 'Arial Black', sans-serif" fontWeight="900" fontSize="22" fill="url(#brandGold)" letterSpacing="1.8" filter="url(#logoGlow)">GOLDMINT</text>
      <text x="66" y="46" fontFamily="Pretendard, sans-serif" fontWeight="600" fontSize="10" fill="#cbd5e1" letterSpacing="1.5">돈복사 시스템 · AUTO</text>
    </svg>
  );
};

export default function Sidebar() {
  const pathname = usePathname();
  const { user, logout } = useAuth();
  const [mini, setMini] = useState(false);
  const [mobileOpen, setMobileOpen] = useState(false);

  useEffect(() => { setMobileOpen(false); }, [pathname]);

  const initial = (user?.username?.[0] || '?').toUpperCase();
  const w = mini ? 'w-[72px]' : 'w-[280px]';

  return (
    <>
      {/* 모바일 햄버거 (사이드바 밖) */}
      <button
        onClick={() => setMobileOpen(true)}
        className="lg:hidden fixed top-3 left-3 z-40 bg-slate-800 text-white p-2 rounded-md shadow-md"
      >
        <Menu size={20} />
      </button>

      {/* 모바일 오버레이 */}
      {mobileOpen && (
        <div
          className="lg:hidden fixed inset-0 z-40 bg-black/50"
          onClick={() => setMobileOpen(false)}
        />
      )}

      {/* 사이드바 */}
      <aside className={cn(
        'bg-slate-900 text-slate-200 flex flex-col h-screen sticky top-0 transition-all duration-200 z-50',
        'hidden lg:flex',
        w,
      )}>
        <SidebarInner mini={mini} setMini={setMini} pathname={pathname} initial={initial} username={user?.username || ''} role={user?.role || ''} logout={logout} />
      </aside>

      {/* 모바일 슬라이드 사이드바 */}
      <aside className={cn(
        'lg:hidden fixed top-0 left-0 h-screen w-[260px] bg-slate-900 text-slate-200 flex flex-col z-50 transition-transform',
        mobileOpen ? 'translate-x-0' : '-translate-x-full',
      )}>
        <SidebarInner mini={false} setMini={() => setMobileOpen(false)} pathname={pathname} initial={initial} username={user?.username || ''} role={user?.role || ''} logout={logout} />
      </aside>
    </>
  );
}

function SidebarInner({ mini, setMini, pathname, initial, username, role, logout }: any) {
  return (
    <>
      {/* 헤더: 로고(좌) + 햄버거(우) */}
      <div className="flex items-center justify-between px-3 py-3 border-b border-slate-700">
        {!mini && <Logo mini={false} />}
        {mini && <Logo mini={true} />}
        {!mini && (
          <button onClick={() => setMini(true)} className="p-2 rounded hover:bg-slate-700">
            <Menu size={18} />
          </button>
        )}
      </div>
      {mini && (
        <button onClick={() => setMini(false)} className="mx-2 my-2 p-2 rounded hover:bg-slate-700 text-slate-300">
          <Menu size={18} className="mx-auto" />
        </button>
      )}

      {/* 메뉴 */}
      <nav className="flex-1 overflow-y-auto scrollbar-thin py-2">
        {NAV.filter(n => !n.adminOnly || role === 'admin').map((n) => {
          const active = pathname === n.href || (n.href !== '/' && pathname.startsWith(n.href));
          return (
            <Link
              key={n.href}
              href={n.href}
              className={cn(
                'flex items-center gap-3 mx-2 my-1 px-3 py-2.5 rounded-lg text-sm font-medium transition-colors',
                active
                  ? 'bg-blue-600 text-white shadow-md'
                  : 'text-slate-300 hover:bg-slate-700/60 hover:text-white',
                mini && 'justify-center px-2',
              )}
              title={n.label}
            >
              <n.icon size={18} className={cn(active ? 'text-white' : 'text-blue-400')} />
              {!mini && <span>{n.label}</span>}
            </Link>
          );
        })}
      </nav>

      {/* 푸터: 사용자 + 로그아웃 */}
      <div className="border-t border-slate-700 p-3">
        {!mini ? (
          <>
            <div className="flex items-center gap-3 mb-2">
              <div className="w-9 h-9 rounded-full flex items-center justify-center font-extrabold text-sm shrink-0"
                   style={{ background: 'radial-gradient(circle at 30% 30%, #fef3c7 0%, #fbbf24 45%, #b45309 100%)', color: '#7c2d12', border: '1px solid #92400e' }}>
                {initial}
              </div>
              <div className="flex-1 min-w-0">
                <div className="text-sm font-semibold text-slate-100 truncate">{username || 'guest'}</div>
                <div className="text-xs text-slate-400">{role}</div>
              </div>
            </div>
            <button onClick={logout} className="w-full flex items-center justify-center gap-2 py-2 rounded-lg bg-slate-800 hover:bg-slate-700 text-slate-300 text-sm">
              <LogOut size={14}/> 로그아웃
            </button>
          </>
        ) : (
          <button onClick={logout} className="w-full p-2 rounded hover:bg-slate-700" title={`${username} 로그아웃`}>
            <LogOut size={18} className="mx-auto text-slate-300"/>
          </button>
        )}
      </div>
    </>
  );
}