import type { GameConfig } from "@deadhead/content";

/** XP for one delivery, in whole points: base + per-million-km × distance + per-tier × tier. */
export function deliveryXp(distanceMillionKm: number, tier: number, config: GameConfig): number {
  const { base, perMillionKm, perCargoTier } = config.xpPerDelivery;
  return Math.round(base + perMillionKm * distanceMillionKm + perCargoTier * tier);
}

/** Pilot level: how many level thresholds the pilot's total XP has reached. */
export function pilotLevel(totalXp: number, config: GameConfig): number {
  return config.pilotLevelXpThresholds.filter((threshold) => totalXp >= threshold).length;
}

/** Unspent skill points: levels × points per level minus points spent, never below 0. */
export function skillPointsAvailable(
  level: number,
  pointsSpent: number,
  config: GameConfig,
): number {
  return Math.max(0, level * config.skillPointsPerLevel - pointsSpent);
}