import { Link, useLocation, useNavigate } from 'react-router-dom';
import { useThemeContext } from '../contexts/ThemeContext';

interface MenuItem {
    id: string;
    label: string;
    path: string;
}

interface MenuSection {
    id: string;
    label: string;
    shortLabel: string;
    icon: React.ReactNode;
    defaultPath: string;
    children: MenuItem[];
}

const MENU_STRUCTURE: MenuSection[] = [
    {
        id: 'collector',
        label: 'S&P Collector',
        shortLabel: 'Collector',
        icon: (
            <svg className="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 7v10c0 2.21 3.582 4 8 4s8-1.79 8-4V7M4 7c0 2.21 3.582 4 8 4s8-1.79 8-4M4 7c0-2.21 3.582-4 8-4s8 1.79 8 4m0 5c0 2.21-3.582 4-8 4s-8-1.79-8-4" />
            </svg>
        ),
        defaultPath: '/dashboard',
        children: [
            { id: 'dashboard', label: '대시보드', path: '/dashboard' },
            { id: 'executions', label: '실행 이력', path: '/executions' },
            { id: 'recollects', label: '재수집 이력', path: '/recollects' },
            { id: 'jobs', label: '작업 관리', path: '/jobs' },
            { id: 'schedules', label: '스케줄', path: '/schedules' },
            { id: 'timeline', label: '타임라인', path: '/schedule-timeline' },
        ],
    },
    {
        id: 'bypass',
        label: 'S&P Bypass',
        shortLabel: 'Bypass',
        icon: (
            <svg className="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M8 9l4-4 4 4m0 6l-4 4-4-4" />
            </svg>
        ),
        defaultPath: '/bypass-catalog',
        children: [
            { id: 'bypass-catalog', label: 'API 카탈로그', path: '/bypass-catalog' },
            { id: 'bypass-config', label: 'API 관리', path: '/bypass-config' },
        ],
    },
    {
        id: 'risk',
        label: 'S&P Risk & Compliance',
        shortLabel: 'Risk & Compliance',
        icon: (
            <svg className="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 12l2 2 4-4m5.618-4.016A11.955 11.955 0 0112 2.944a11.955 11.955 0 01-8.618 3.04A12.02 12.02 0 003 9c0 5.591 3.824 10.29 9 11.622 5.176-1.332 9-6.03 9-11.622 0-1.042-.133-2.052-.382-3.016z" />
            </svg>
        ),
        defaultPath: '/risk-compliance-history',
        children: [
            { id: 'risk-compliance-history', label: 'Change History', path: '/risk-compliance-history' },
            { id: 'screening-guide', label: 'Screening Guide', path: '/screening-guide' },
        ],
    },
];

function getCurrentSection(pathname: string): MenuSection | null {
    for (const section of MENU_STRUCTURE) {
        if (section.children.some((c) => pathname === c.path || pathname.startsWith(c.path + '/'))) {
            return section;
        }
    }
    return null;
}

export default function Navbar() {
    const location = useLocation();
    const navigate = useNavigate();
    const { theme, toggle } = useThemeContext();
    const currentSection = getCurrentSection(location.pathname);

    // 메인 화면에서는 숨김
    if (!currentSection) return null;

    const isActivePath = (path: string) => {
        return location.pathname === path || location.pathname.startsWith(path + '/');
    };

    return (
        <div className="mb-6">
            {/* 1단: 섹션 탭 */}
            <div className="bg-slate-900 px-6 pt-3 rounded-t-xl flex items-center">
                <Link
                    to="/"
                    className="flex items-center gap-1 px-3 py-2.5 text-sm text-slate-400 hover:text-white no-underline transition-colors"
                    title="메인 메뉴"
                >
                    ←
                </Link>
                <div className="flex-1 flex items-center justify-start gap-1">
                    {MENU_STRUCTURE.map((section) => (
                        <button
                            key={section.id}
                            onClick={() => {
                                if (currentSection?.id !== section.id) {
                                    navigate(section.defaultPath);
                                }
                            }}
                            className={`flex items-center gap-2 px-5 py-2.5 rounded-t-lg text-sm font-medium transition-all ${
                                currentSection?.id === section.id
                                    ? 'bg-wing-bg text-wing-text shadow-sm'
                                    : 'text-slate-400 hover:text-white hover:bg-slate-800'
                            }`}
                        >
                            {section.icon}
                            <span>{section.shortLabel}</span>
                        </button>
                    ))}
                </div>
                <button
                    onClick={toggle}
                    className="px-2.5 py-1.5 rounded-lg text-sm text-slate-400 hover:text-white hover:bg-slate-800 transition-colors"
                    title={theme === 'dark' ? '라이트 모드' : '다크 모드'}
                >
                    {theme === 'dark' ? '☀️' : '🌙'}
                </button>
            </div>

            {/* 2단: 서브 탭 */}
            <div className="bg-wing-surface border-b border-wing-border px-6 rounded-b-xl shadow-md">
                <div className="flex gap-1 -mb-px justify-end">
                    {currentSection?.children.map((child) => (
                        <button
                            key={child.id}
                            onClick={() => navigate(child.path)}
                            className={`px-4 py-3 text-sm font-medium transition-all border-b-2 ${
                                isActivePath(child.path)
                                    ? 'border-blue-600 text-blue-600'
                                    : 'border-transparent text-wing-muted hover:text-wing-text hover:border-wing-border'
                            }`}
                        >
                            {child.label}
                        </button>
                    ))}
                </div>
            </div>
        </div>
    );
}