import { MetadataRoute } from 'next';
import { PrismaClient } from '@prisma/client';
import { getLocalizedValue } from '@/lib/i18n';
import { config } from '@/lib/config';

const prisma = new PrismaClient();

export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
    const baseUrl = process.env.NEXT_PUBLIC_DOMAIN || config.domain;
    const protocol = process.env.NODE_ENV === 'production' ? 'https' : 'http';
    const siteUrl = `${protocol}://${baseUrl}`;

    const now = new Date().toISOString();

    // Static pages
    const staticPages: MetadataRoute.Sitemap = [
        {
            url: `${siteUrl}/en`,
            lastModified: now,
            changeFrequency: 'daily',
            priority: 1.0,
            alternates: {
                languages: {
                    'de': `${siteUrl}/de`,
                    'en': `${siteUrl}/en`,
                    'x-default': `${siteUrl}/en`,
                },
            },
        },
        {
            url: `${siteUrl}/de`,
            lastModified: now,
            changeFrequency: 'monthly',
            priority: 0.8,
            alternates: {
                languages: {
                    'de': `${siteUrl}/de`,
                    'en': `${siteUrl}/en`,
                    'x-default': `${siteUrl}/en`,
                },
            },
        },
        {
            url: `${siteUrl}/en/about`,
            lastModified: now,
            changeFrequency: 'monthly',
            priority: 0.7,
            alternates: {
                languages: {
                    'de': `${siteUrl}/de/about`,
                    'en': `${siteUrl}/en/about`,
                    'x-default': `${siteUrl}/en/about`,
                },
            },
        },
        {
            url: `${siteUrl}/de/about`,
            lastModified: now,
            changeFrequency: 'monthly',
            priority: 0.7,
            alternates: {
                languages: {
                    'de': `${siteUrl}/de/about`,
                    'en': `${siteUrl}/en/about`,
                    'x-default': `${siteUrl}/en/about`,
                },
            },
        },
    ];

    // Dynamic genre pages
    try {
        // Während des Docker-Builds wird häufig eine temporäre SQLite-DB (file:./dev.db)
        // ohne migrierte Tabellen verwendet. In diesem Fall überspringen wir die
        // Datenbankabfrage und liefern nur die statischen Seiten, um Build-Fehler zu vermeiden.
        const dbUrl = process.env.DATABASE_URL;
        if (dbUrl && dbUrl.startsWith('file:./')) {
            return staticPages;
        }

        const genres = await prisma.genre.findMany({
            where: { active: true },
        });

        const genrePages: MetadataRoute.Sitemap = [];

        for (const genre of genres) {
            const genreNameEn = getLocalizedValue(genre.name, 'en');
            const genreNameDe = getLocalizedValue(genre.name, 'de');

            // Only add if genre name is valid
            if (genreNameEn && genreNameDe) {
                const encodedEn = encodeURIComponent(genreNameEn);
                const encodedDe = encodeURIComponent(genreNameDe);

                genrePages.push(
                    {
                        url: `${siteUrl}/en/${encodedEn}`,
                        lastModified: now,
                        changeFrequency: 'daily',
                        priority: 0.9,
                        alternates: {
                            languages: {
                                'de': `${siteUrl}/de/${encodedDe}`,
                                'en': `${siteUrl}/en/${encodedEn}`,
                                'x-default': `${siteUrl}/en/${encodedEn}`,
                            },
                        },
                    },
                    {
                        url: `${siteUrl}/de/${encodedDe}`,
                        lastModified: now,
                        changeFrequency: 'daily',
                        priority: 0.9,
                        alternates: {
                            languages: {
                                'de': `${siteUrl}/de/${encodedDe}`,
                                'en': `${siteUrl}/en/${encodedEn}`,
                                'x-default': `${siteUrl}/en/${encodedEn}`,
                            },
                        },
                    }
                );
            }
        }

        return [...staticPages, ...genrePages];
    } catch (error) {
        console.error('Error generating sitemap:', error);
        // Return static pages only if database query fails
        return staticPages;
    } finally {
        await prisma.$disconnect();
    }
}