const crypto = require('crypto');

const db = require('../../db/knex');

function normalizeCoordinate(value) {
  if (value == null || value === '') {
    return null;
  }

  const coordinate = Number(value);

  if (!Number.isFinite(coordinate)) {
    return null;
  }

  return coordinate;
}

async function enqueueGeocodeJob({
  entityType,
  entityId,
  lat,
  lon,
}) {
  if (
    entityType !== 'photo'
    && entityType !== 'activity'
  ) {
    throw new Error(
      `Tipo entità geocode non valido: ${entityType}`
    );
  }

  if (!entityId) {
    throw new Error(
      'entityId geocode mancante'
    );
  }

  const normalizedLat = normalizeCoordinate(lat);
  const normalizedLon = normalizeCoordinate(lon);

  if (
    normalizedLat == null
    || normalizedLon == null
  ) {
    return {
      queued: false,
      reason: 'coordinates_missing',
    };
  }

  if (
    normalizedLat < -90
    || normalizedLat > 90
    || normalizedLon < -180
    || normalizedLon > 180
  ) {
    return {
      queued: false,
      reason: 'coordinates_invalid',
    };
  }

  const now = db.fn.now();

  await db('geocode_jobs')
    .insert({
      id: crypto.randomUUID(),
      entity_type: entityType,
      entity_id: String(entityId),
      lat: normalizedLat,
      lon: normalizedLon,
      status: 'pending',
      attempts: 0,
      last_error: null,
      started_at: null,
      completed_at: null,
      created_at: now,
      updated_at: now,
    })
    .onConflict([
      'entity_type',
      'entity_id',
    ])
    .merge({
      lat: normalizedLat,
      lon: normalizedLon,
      status: 'pending',
      attempts: 0,
      last_error: null,
      started_at: null,
      completed_at: null,
      updated_at: now,
    });

  return {
    queued: true,
    entity_type: entityType,
    entity_id: String(entityId),
    lat: normalizedLat,
    lon: normalizedLon,
  };
}

module.exports = {
  enqueueGeocodeJob,
};