import { ApiError } from './errors.mjs';
import { coordinates } from './coordinates.mjs';

export function normalizeWalking(raw) {
  if (['NoRoute', 'NoSegment'].includes(raw?.code)) throw new ApiError(404, 'walking_not_found');
  const route = raw?.routes?.[0];
  if (raw?.code !== 'Ok' || !route || typeof route.distance !== 'number' || !Number.isFinite(route.distance) || route.distance < 0
    || typeof route.duration !== 'number' || !Number.isFinite(route.duration) || route.duration < 0
    || route.geometry?.type !== 'LineString' || !Array.isArray(route.geometry.coordinates)
    || route.geometry.coordinates.length < 2 || route.geometry.coordinates.length > 100000) throw new ApiError(502);
  const points = route.geometry.coordinates.map(point => {
    if (!Array.isArray(point) || point.length !== 2 || typeof point[0] !== 'number' || typeof point[1] !== 'number'
      || Object.keys(coordinates(point[1], point[0])).length !== 2) throw new ApiError(502);
    return [point[0], point[1]];
  });
  return { distance: route.distance, duration: route.duration, geometry: { type: 'LineString', coordinates: points } };
}