const SPARQL_ENDPOINT = 'https://query.wikidata.org/sparql'

export interface WikidataAirline {
  iata: string
  icao: string | null
  name: string
  logoUrl: string | null
  website: string | null
}

/**
 * Fetch all airlines from Wikidata via SPARQL.
 * Returns deduplicated list by IATA code (first logo wins).
 */
export async function getAirlinesFromWikidata(): Promise<WikidataAirline[]> {
  const query = `
    SELECT ?airlineLabel ?iata ?icao ?logo ?website WHERE {
      ?airline wdt:P31 wd:Q46970.
      ?airline wdt:P229 ?iata.
      OPTIONAL { ?airline wdt:P230 ?icao. }
      OPTIONAL { ?airline wdt:P154 ?logo. }
      OPTIONAL { ?airline wdt:P856 ?website. }
      SERVICE wikibase:label { bd:serviceParam wikibase:language "es,en". }
    }
  `

  const data = await $fetch<{ results: { bindings: Record<string, { value: string }>[] } }>(
    SPARQL_ENDPOINT,
    {
      query: { query, format: 'json' },
      headers: {
        'Accept': 'application/sparql-results+json',
        'User-Agent': 'Vuelato/1.0 (https://github.com/vuelato; contact@vuelato.com)'
      }
    }
  )

  // Deduplicate by IATA code (keep first entry with logo if available)
  const map = new Map<string, WikidataAirline>()

  for (const row of data.results.bindings) {
    const iata = row.iata?.value
    if (!iata) continue

    const existing = map.get(iata)
    const logoUrl = row.logo?.value || null
    const website = row.website?.value || null

    // Keep entry with logo/website over entry without
    if (!existing || (!existing.logoUrl && logoUrl) || (!existing.website && website)) {
      map.set(iata, {
        iata,
        icao: row.icao?.value || existing?.icao || null,
        name: row.airlineLabel?.value || existing?.name || '',
        logoUrl: logoUrl || existing?.logoUrl || null,
        website: website || existing?.website || null
      })
    }
  }

  return Array.from(map.values())
}