import { error } from '@sveltejs/kit'
import type { RequestHandler } from './$types'
import { fetchAPI } from '$utils/api'


export const GET = (async ({ url, setHeaders }) => {
    try {
        const locations = []
        const products = []

        // Get dynamic data from API
        const res = await fetchAPI(`query {
            locations: location (filter: { status: { _eq: "published" }}) {
                slug
                country { slug }
            }
            products: product (filter: { status: { _eq: "published" }}) {
                location { slug }
            }
        }`)

        if (res) {
            const { data } = res
            locations.push(...data.locations)
            products.push(...data.products)
        }

        // Static pages
        const pages = [
            ['/', '1.0', 'daily'],
            ['/photos', '1.0', 'daily'],
            ['/locations', '0.6', 'weekly'],
            ['/shop', '0.8', 'weekly'],
            ['/about', '0.6', 'weekly'],
            ['/terms', '0.6', 'weekly'],
            ['/subscribe', '0.6', 'weekly'],
            ['/credits', '0.6', 'monthly'],
        ]

        // All pages
        const allPages = [
            // Static pages
            ...pages.map(([path, priority, frequency]) => ({
                path,
                priority,
                frequency,
            })),

            // Locations
            ...locations.map(({ slug, country }) => ({
                path: `/${country.slug}/${slug}`,
                priority: 0.7,
                frequency: 'monthly',
            })),

            // Products
            ...products.map(({ location: { slug }}) => ({
                path: `/shop/poster-${slug}`,
                priority: 0.7,
                frequency: 'monthly',
            })),
        ]

        const sitemap = render(url.origin, allPages)

        setHeaders({
            'Content-Type': 'application/xml',
            'Cache-Control': 'max-age=0, s-max-age=600',
        })

        return new Response(sitemap)
    } catch (err) {
        throw error(500, err.message)
    }
}) satisfies RequestHandler


const render = (origin: string, pages: any[]) => {
    return `<?xml version="1.0" encoding="UTF-8"?>
<urlset
    xmlns="https://www.sitemaps.org/schemas/sitemap/0.9"
    xmlns:xhtml="https://www.w3.org/1999/xhtml"
    xmlns:mobile="https://www.google.com/schemas/sitemap-mobile/1.0"
    xmlns:news="https://www.google.com/schemas/sitemap-news/0.9"
    xmlns:image="https://www.google.com/schemas/sitemap-image/1.1"
    xmlns:video="https://www.google.com/schemas/sitemap-video/1.1"
>
    ${pages.map(({ path, priority, frequency }) => `<url>
        <loc>${origin}${path}</loc>
        <priority>${priority}</priority>
        <changefreq>${frequency}</changefreq>
    </url>`).join('')}
</urlset>`
}