const API_VERSION = '2024-01'

function getConfig() {
  const domain = process.env.SHOPIFY_STORE_DOMAIN
  const token = process.env.SHOPIFY_ADMIN_API_TOKEN
  if (!domain || !token) throw new Error('SHOPIFY_STORE_DOMAIN et SHOPIFY_ADMIN_API_TOKEN requis')
  return {
    baseUrl: `https://${domain}/admin/api/${API_VERSION}`,
    headers: { 'X-Shopify-Access-Token': token, 'Content-Type': 'application/json' },
  }
}

export async function addProductToCollection(shopifyProductId: string, collectionId: string): Promise<void> {
  if (!collectionId?.trim()) return
  const { baseUrl, headers } = getConfig()
  const res = await fetch(`${baseUrl}/collects.json`, {
    method: 'POST',
    headers,
    body: JSON.stringify({ collect: { product_id: shopifyProductId, collection_id: collectionId } }),
  })
  if (!res.ok) {
    const err = await res.text()
    if (!err.includes('already') && !err.includes('taken')) {
      throw new Error(`Shopify addToCollection error: ${res.status} — ${err}`)
    }
  }
}