import { locales, defaultLocale, Locale } from './i18n';
import { getTranslations } from './translations';

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

export function generateStaticPages(baseUrl: string): SitemapEntry[] {
    const staticPages = [
        { path: '', priority: 1.0, changeFrequency: 'daily' as const },
        { path: '/blog', priority: 0.8, changeFrequency: 'weekly' as const },
        { path: '/contact', priority: 0.6, changeFrequency: 'monthly' as const },
        { path: '/products', priority: 0.7, changeFrequency: 'weekly' as const },
    ];

    const entries: SitemapEntry[] = [];

    locales.forEach((locale) => {
        staticPages.forEach((page) => {
            const url =
                locale === defaultLocale
                    ? `${baseUrl}${page.path}`
                    : `${baseUrl}/${locale}${page.path}`;

            entries.push({
                url,
                lastModified: new Date(),
                changeFrequency: page.changeFrequency,
                priority: page.priority,
                alternates: {
                    languages: Object.fromEntries(
                        locales.map((loc) => [
                            loc,
                            loc === defaultLocale
                                ? `${baseUrl}${page.path}`
                                : `${baseUrl}/${loc}${page.path}`,
                        ]),
                    ),
                },
            });
        });
    });

    return entries;
}

export function generateBlogPages(baseUrl: string): SitemapEntry[] {
    // Get blog post slugs from your translations or database
    const blogSlugs = ['featured', 'post1', 'post2', 'post3', 'post4', 'post5'];

    const entries: SitemapEntry[] = [];

    locales.forEach((locale) => {
        blogSlugs.forEach((slug) => {
            const url =
                locale === defaultLocale
                    ? `${baseUrl}/blog/${slug}`
                    : `${baseUrl}/${locale}/blog/${slug}`;

            entries.push({
                url,
                lastModified: new Date(),
                changeFrequency: 'monthly',
                priority: 0.7,
                alternates: {
                    languages: Object.fromEntries(
                        locales.map((loc) => [
                            loc,
                            loc === defaultLocale
                                ? `${baseUrl}/blog/${slug}`
                                : `${baseUrl}/${loc}/blog/${slug}`,
                        ]),
                    ),
                },
            });
        });
    });

    return entries;
}

export function generateSitemap(baseUrl: string): SitemapEntry[] {
    const staticPages = generateStaticPages(baseUrl);
    const blogPages = generateBlogPages(baseUrl);

    return [...staticPages, ...blogPages];
}

// Helper function to get all available blog post slugs
export function getBlogPostSlugs(): string[] {
    // In a real application, you might fetch this from a CMS or database
    // For now, we'll use the static list from your existing blog structure
    return ['featured', 'post1', 'post2', 'post3', 'post4', 'post5'];
}

// Helper function to validate if a blog post exists
export function validateBlogPost(slug: string, locale: Locale): boolean {
    const translations = getTranslations(locale);
    const posts = translations.blog.posts;
    return slug in posts;
}

export function getSitemapStats(baseUrl: string): {
    urlCount: number;
    staticPages: number;
    blogPages: number;
    languages: number;
} {
    const staticPages = generateStaticPages(baseUrl);
    const blogPages = generateBlogPages(baseUrl);
    const sitemap = [...staticPages, ...blogPages];

    return {
        urlCount: sitemap.length,
        staticPages: staticPages.length,
        blogPages: blogPages.length,
        languages: locales.length,
    };
}