import type { MetadataRoute } from 'next'
import { db } from '@/lib/db'
import { tournaments, teams, goals } from '@/lib/db/schema'
import { asc } from 'drizzle-orm'

const BASE = (process.env.NEXT_PUBLIC_SITE_URL ?? 'http://localhost:3000').replace(/\/$/, '')

function slugify(name: string) {
  return name.toLowerCase().replace(/[^a-z0-9]+/g, '-').replace(/^-|-$/g, '')
}

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

  const [allTournaments, allTeams, allPlayers] = await Promise.all([
    db.select({ year: tournaments.year }).from(tournaments).orderBy(asc(tournaments.year)),
    db.select({ name: teams.name }).from(teams).orderBy(asc(teams.name)),
    db.selectDistinct({ playerName: goals.playerName }).from(goals),
  ])

  return [
    { url: BASE, lastModified: now, changeFrequency: 'hourly', priority: 1 },
    { url: `${BASE}/groups`, lastModified: now, changeFrequency: 'hourly', priority: 0.9 },
    { url: `${BASE}/history`, changeFrequency: 'monthly', priority: 0.7 },
    { url: `${BASE}/stats`, changeFrequency: 'daily', priority: 0.7 },
    ...allTournaments.map(t => ({
      url: `${BASE}/tournaments/${t.year}`,
      changeFrequency: (t.year === 2026 ? 'hourly' : 'monthly') as 'hourly' | 'monthly',
      priority: t.year === 2026 ? 0.95 : 0.6,
    })),
    ...allTeams.map(t => ({
      url: `${BASE}/teams/${slugify(t.name)}`,
      changeFrequency: 'weekly' as const,
      priority: 0.5,
    })),
    ...allPlayers.map(p => ({
      url: `${BASE}/players/${encodeURIComponent(p.playerName)}`,
      changeFrequency: 'monthly' as const,
      priority: 0.4,
    })),
  ]
}