interface AirportResult {
  iata: string
  name: string
  city_name: string
  country_code: string
  country_name: string
  lat: number | null
  lon: number | null
}

export function useLocations() {
  const supabase = useSupabaseClient()

  const airports = ref<AirportResult[]>([])
  const loaded = ref(false)

  async function loadAirports() {
    if (loaded.value) return
    const { data } = await supabase
      .from('airports')
      .select('iata, name, city_name, country_code, country_name, lat, lon')
      .order('iata')
      .limit(10000)
    if (data && data.length > 0) {
      airports.value = data as AirportResult[]
      loaded.value = true
    } else {
      // Fallback: fetch from Flightics API and cache in Supabase
      await syncLocations()
    }
  }

  async function syncLocations() {
    try {
      const data = await $fetch('/api/sync/locations', { method: 'POST' })
      if (data?.count) {
        // Reload from Supabase after sync
        const { data: fresh } = await supabase
          .from('airports')
          .select('iata, name, city_name, country_code, country_name, lat, lon')
          .order('iata')
        airports.value = (fresh as AirportResult[]) || []
        loaded.value = true
      }
    } catch {
      // Silently fail, user can retry
    }
  }

  function normalize(s: string): string {
    return s.normalize('NFD').replace(/[\u0300-\u036f]/g, '').toLowerCase()
  }

  function searchAirports(query: string): AirportResult[] {
    if (!query || query.length < 2) return []
    const q = normalize(query)
    return airports.value
      .filter(a =>
        normalize(a.iata).includes(q) ||
        normalize(a.name).includes(q) ||
        normalize(a.city_name || '').includes(q)
      )
      .slice(0, 20)
  }

  return { airports, loaded, loadAirports, searchAirports, syncLocations }
}