import type { ReactNode } from 'react';
import { Navigate, useLocation, createBrowserRouter } from 'react-router-dom';
import MainLayout from '@/layouts/MainLayout';
import SessionSplash from '@/components/SessionSplash';
import CollectionPage from '@/pages/collection/CollectionPage';
import LoginPage from '@/pages/auth/LoginPage';
import OnlineProductsPage from '@/pages/online-products/OnlineProductsPage';
import PasswordSettingsPage from '@/pages/settings/PasswordSettingsPage';
import PricingPage from '@/pages/pricing/PricingPage';
import ProductEditPage from '@/pages/products/ProductEditPage';
import ProfileSettingsPage from '@/pages/settings/ProfileSettingsPage';
import RegisterPage from '@/pages/auth/RegisterPage';
import ShopsPage from '@/pages/shops/ShopsPage';
import WatermarksPage from '@/pages/watermarks/WatermarksPage';
import { PlatformProvider } from '@/services/platform';
import { useSession } from '@/services/session';

/** 主布局守卫：会话恢复中显示启动屏；未认证跳登录页并记住来源路径 */
function RequireSession({ children }: { children: ReactNode }) {
    const { status } = useSession();
    const location = useLocation();

    if (status === 'restoring') {
        return <SessionSplash />;
    }
    if (status === 'anonymous') {
        return <Navigate to="/login" replace state={{ from: location.pathname }} />;
    }
    return children;
}

/** 认证页互斥：已登录访问 /login、/register 时回到来源页或主布局 */
function RedirectIfAuthenticated({ children }: { children: ReactNode }) {
    const { status } = useSession();
    const location = useLocation();

    if (status === 'authenticated') {
        const from = (location.state as { from?: string } | null)?.from;
        return <Navigate to={from && from.startsWith('/') ? from : '/'} replace />;
    }
    return children;
}

export const router = createBrowserRouter([
    {
        path: '/',
        element: (
            <RequireSession>
                {/* 平台上下文仅在登录后可用，随主布局挂载 */}
                <PlatformProvider>
                    <MainLayout />
                </PlatformProvider>
            </RequireSession>
        ),
        children: [
            { index: true, element: <Navigate to="/online-products" replace /> },
            { path: 'online-products', element: <OnlineProductsPage /> },
            { path: 'collection', element: <CollectionPage /> },
            { path: 'shops', element: <ShopsPage /> },
            { path: 'watermarks', element: <WatermarksPage /> },
            { path: 'pricing', element: <PricingPage /> },
            // 商品 AI 编辑页：从采集箱/在线商品进入，不在左侧菜单中出现
            { path: 'products/:id', element: <ProductEditPage /> },
            // 个人中心设置页：从页头用户菜单进入，不在左侧菜单中出现
            { path: 'settings/profile', element: <ProfileSettingsPage /> },
            { path: 'settings/password', element: <PasswordSettingsPage /> },
        ],
    },
    {
        path: 'login',
        element: (
            <RedirectIfAuthenticated>
                <LoginPage />
            </RedirectIfAuthenticated>
        ),
    },
    {
        path: 'register',
        element: (
            <RedirectIfAuthenticated>
                <RegisterPage />
            </RedirectIfAuthenticated>
        ),
    },
    { path: '*', element: <Navigate to="/" replace /> },
]);