import type { Contract } from "./contract";

export const LONG_HAUL_SKILL_ID = "long-haul";

/** A pilot's skill levels by skill id; a missing skill is level 0. */
export type SkillLevels = Readonly<Record<string, number>>;

export type PilotCheck =
  { ok: true } | { ok: false; reason: "cargo-skill-too-low" | "long-haul-too-low" };

export function skillLevel(skills: SkillLevels, skillId: string): number {
  return skills[skillId] ?? 0;
}

/** Whether a pilot's skills meet a contract's cargo-skill and Long Haul requirements. */
export function checkPilotEligibility(skills: SkillLevels, contract: Contract): PilotCheck {
  const required = contract.requiredSkill;
  if (required && skillLevel(skills, required.skillId) < required.level) {
    return { ok: false, reason: "cargo-skill-too-low" };
  }
  if (skillLevel(skills, LONG_HAUL_SKILL_ID) < contract.requiredLongHaulLevel) {
    return { ok: false, reason: "long-haul-too-low" };
  }
  return { ok: true };
}