/**
 * Calculates the transit time in milliseconds for a shipment.
 * @param distance - Euclidean distance in map units
 * @param vehicleSpeed - Vehicle speed in km/h (from maxSpeedOnRoad, maxAirspeed, etc.)
 */
export function calculateTransitTime(
  distance: number,
  vehicleSpeed: number,
): number {
  const hours = distance / vehicleSpeed;
  return hours * 60 * 60 * 1000;
}

/**
 * Calculates the total fuel cost for a shipment.
 * @param distance - Euclidean distance in map units
 * @param consumptionRate - Fuel consumed per unit of distance (from vehicle's fuelConsumptionRate)
 */
export function calculateFuelCost(
  distance: number,
  consumptionRate: number,
): number {
  return Math.ceil(distance * consumptionRate);
}

/**
 * Calculates the fuel consumed per game tick.
 * @param totalFuelCost - Total fuel for the trip
 * @param totalTicks - Total number of ticks for the trip
 */
export function calculateFuelPerTick(
  totalFuelCost: number,
  totalTicks: number,
): number {
  if (totalTicks <= 0) return totalFuelCost;
  return totalFuelCost / totalTicks;
}

/**
 * Calculates the number of game ticks for a given duration.
 * @param durationMs - Duration in milliseconds
 * @param tickIntervalMinutes - Game tick interval in minutes
 */
export function calculateTicksForDuration(
  durationMs: number,
  tickIntervalMinutes: number,
): number {
  const tickMs = tickIntervalMinutes * 60 * 1000;
  return Math.ceil(durationMs / tickMs);
}

/**
 * Gets the effective speed of a vehicle, preferring road speed.
 * Falls back to off-road, air, or sea speed.
 */
export function getVehicleEffectiveSpeed(vehicle: {
  combat?: {
    maxSpeedOnRoad?: number | null;
    maxSpeedOffRoad?: number | null;
    maxAirspeed?: number | null;
    maxKnots?: number | null;
  } | null;
}): number {
  return (
    vehicle.combat?.maxSpeedOnRoad ??
    vehicle.combat?.maxSpeedOffRoad ??
    vehicle.combat?.maxAirspeed ??
    vehicle.combat?.maxKnots ??
    50 // default fallback speed
  );
}