// Utility functions for sitemap generation

export interface SitemapRoute {
    url: string;
    lastModified?: Date;
    changeFrequency?: 'always' | 'hourly' | 'daily' | 'weekly' | 'monthly' | 'yearly' | 'never';
    priority?: number;
    alternates?: {
        languages?: Record<string, string>;
    };
}

// Supported languages
export const supportedLanguages = ['zh-CN', 'zh-TW', 'en'];

// Static routes configuration with multilingual support
export const staticRoutes: SitemapRoute[] = [
    {
        url: '',
        lastModified: new Date(),
        changeFrequency: 'daily',
        priority: 1.0,
    },
    {
        url: '/about',
        lastModified: new Date(),
        changeFrequency: 'monthly',
        priority: 0.8,
    },
    {
        url: '/products',
        lastModified: new Date(),
        changeFrequency: 'weekly',
        priority: 0.9,
    },
    {
        url: '/news',
        lastModified: new Date(),
        changeFrequency: 'daily',
        priority: 0.8,
    },
    {
        url: '/support',
        lastModified: new Date(),
        changeFrequency: 'weekly',
        priority: 0.7,
    },
    {
        url: '/contact',
        lastModified: new Date(),
        changeFrequency: 'monthly',
        priority: 0.6,
    },
];

// Article data with dates for sitemap
export const articlesMetadata = {
    '1': {
        lastModified: new Date('2025-02-10'),
        priority: 0.7,
    },
    '2': {
        lastModified: new Date('2025-02-24'),
        priority: 0.7,
    },
};

// Get all article IDs from the embedded data
export function getAllArticleIds(): string[] {
    return Object.keys(articlesMetadata);
}

// Generate article routes
export function getArticleRoutes(): SitemapRoute[] {
    const articleIds = getAllArticleIds();

    return articleIds.map((id) => {
        const metadata = articlesMetadata[id as keyof typeof articlesMetadata];
        return {
            url: `/news/${id}`,
            lastModified: metadata.lastModified,
            changeFrequency: 'monthly' as const,
            priority: metadata.priority,
        };
    });
}

// Get the base URL from environment or default
export function getBaseUrl(): string {
    // In production, you should set NEXT_PUBLIC_SITE_URL environment variable
    return process.env.NEXT_PUBLIC_SITE_URL || 'https://dongyun.com';
}

// Generate language-specific routes (if needed for future implementation)
export function getLanguageRoutes(): SitemapRoute[] {
    const routes: SitemapRoute[] = [];

    // For now, we're not implementing language-specific URLs
    // But this function is ready for future expansion
    // Example: /en/about, /zh-tw/about, etc.

    return routes;
}

// Get all routes combined
export function getAllRoutes(): SitemapRoute[] {
    return [...staticRoutes, ...getArticleRoutes(), ...getLanguageRoutes()];
}