export default defineCachedEventHandler(async (event) => {
  const { flightno } = getQuery(event)
  if (!flightno || typeof flightno !== 'string') {
    throw createError({ statusCode: 400, message: 'flightno is required' })
  }

  const code = flightno.replace(/\s/g, '').toUpperCase()
  const fr24Url = `https://www.flightradar24.com/data/flights/${code.toLowerCase()}`

  // FR24 live feed
  const data = await $fetch<any>(`https://data-live.flightradar24.com/zones/fcgi/feed.js`, {
    query: { flightno: code, faa: 1, satellite: 1, mlat: 1, flarm: 1, adsb: 1, gnd: 1, air: 1, vehicles: 0, estimated: 1, gliders: 0 },
    headers: {
      'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36',
      'Accept': 'application/json'
    }
  }).catch(() => null)

  if (!data) return { found: false, fr24Url }

  // Parse flight entries (skip metadata keys)
  const flights = Object.entries(data)
    .filter(([key]) => !['full_count', 'version', 'stats'].includes(key))
    .map(([id, val]: [string, any]) => {
      if (!Array.isArray(val) || val.length < 18) return null
      return {
        fr24Id: id,
        icao24: val[0],
        lat: val[1],
        lon: val[2],
        heading: val[3],
        altitude: val[4],
        speed: val[5],
        squawk: val[6],
        aircraft: val[8],
        registration: val[9],
        timestamp: val[10],
        origin: val[11],
        destination: val[12],
        flightNumber: val[13],
        onGround: val[14] === 1,
        verticalSpeed: val[15],
        callsign: val[16],
        airline: val[18]
      }
    })
    .filter((f): f is NonNullable<typeof f> => f != null && (f.lat !== 0 || f.lon !== 0 || f.aircraft != null))

  if (flights.length === 0) return { found: false, fr24Url }

  const flight = flights[0]

  // Get detail for richer data
  let detail: any = null
  if (flight.fr24Id) {
    detail = await $fetch<any>(`https://data-live.flightradar24.com/clickhandler/`, {
      query: { version: '1.5', flight: flight.fr24Id },
      headers: {
        'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36'
      }
    }).catch(() => null)
  }

  // Determine status
  let status = 'Programado'
  if (detail?.status?.text) {
    status = detail.status.text
  } else if (flight.altitude > 0 && !flight.onGround) {
    status = 'En vuelo'
  } else if (flight.onGround && flight.speed > 5) {
    status = 'En tierra (taxiing)'
  } else if (flight.onGround) {
    status = 'En tierra'
  }

  return {
    found: true,
    fr24Url,
    flight: {
      flightNumber: flight.flightNumber || code,
      callsign: flight.callsign,
      aircraft: detail?.aircraft?.model?.text || flight.aircraft || null,
      aircraftCode: flight.aircraft,
      registration: flight.registration,
      airline: detail?.airline?.name || flight.airline || null,
      origin: flight.origin,
      destination: flight.destination,
      lat: flight.lat,
      lon: flight.lon,
      altitude: flight.altitude,
      speed: flight.speed,
      heading: flight.heading,
      onGround: flight.onGround,
      verticalSpeed: flight.verticalSpeed,
      status,
      departureDelay: detail?.time?.historical?.delay?.departure ?? null,
      arrivalDelay: detail?.time?.historical?.delay?.arrival ?? null
    }
  }
}, { maxAge: 60 * 5 }) // Cache 5 min