import type { MetadataRoute } from 'next'

const siteUrl = process.env.NEXT_PUBLIC_SITE_URL
if (!siteUrl && process.env.NODE_ENV === 'production') {
  throw new Error('NEXT_PUBLIC_SITE_URL must be set in production builds (used by sitemap.xml)')
}
const baseUrl = (siteUrl || 'http://localhost:3001').replace(/\/$/, '')
const routes = ['', '/posts', '/trades', '/analytics', '/settings', '/privacy', '/terms', '/contact']

export default function sitemap(): MetadataRoute.Sitemap {
  const now = new Date()

  return routes.map((route) => ({
    url: `${baseUrl}/en${route}`,
    lastModified: now,
    changeFrequency: route === '' ? 'hourly' : 'daily',
    priority: route === '' ? 1 : 0.7,
  }))
}