// ============================================================================
// COORDINATE & DISTANCE FORMATTING UTILITIES
// ============================================================================

/**
 * Format coordinate to 6 decimal places (±11cm precision)
 */
export function formatCoordinate(value, type) {
  const dir = type === 'lat' 
    ? (value >= 0 ? 'N' : 'S')
    : (value >= 0 ? 'E' : 'W');
  return `${Math.abs(value).toFixed(6)}°${dir}`;
}

/**
 * Format distance in meters or feet based on unit preference
 */
export function formatDistance(meters, useImperial = false) {
  if (useImperial) {
    const feet = meters * 3.28084;
    if (feet < 5280) {
      return `${feet.toFixed(1)} ft`;
    } else {
      const miles = feet / 5280;
      return `${miles.toFixed(2)} mi`;
    }
  } else {
    if (meters < 1000) {
      return `${meters.toFixed(1)} m`;
    } else {
      const km = meters / 1000;
      return `${km.toFixed(2)} km`;
    }
  }
}

/**
 * Format bearing angle
 */
export function formatBearing(degrees) {
  return `${degrees.toFixed(1)}°`;
}

/**
 * Convert web Mercator to lat/long
 */
export function webMercatorToLonLat(x, y) {
  const R = 6378137;
  const lon = (x / R) * (180 / Math.PI);
  const lat = (2 * Math.atan(Math.exp(y / R)) - Math.PI / 2) * (180 / Math.PI);
  return [lon, lat];
}