import type { CargoType, GameConfig } from "@deadhead/content";
import type { RealTime } from "./clock";

export interface Contract {
  id: string;
  originId: string;
  destinationId: string;
  cargoTypeId: string;
  /** 0 for Standard; 1–5 otherwise, and equal to the required cargo-skill level (decision 0.5.6). */
  tier: number;
  massTonnes: number;
  /** Credits, fixed at offer time (decision 0.5.11). */
  payout: number;
  /** Cargo skill and level needed; null for Standard. */
  requiredSkill: { skillId: string; level: number } | null;
  requiredLongHaulLevel: number;
  offeredAt: RealTime;
  /** End of the board period the contract was offered in. */
  expiresAt: RealTime;
  firstContact: boolean;
}

export interface PayoutInput {
  cargoType: CargoType;
  tier: number;
  massTonnes: number;
  /** Route distance at offer time. */
  distanceMillionKm: number;
  firstContact: boolean;
}

/**
 * Payout in whole credits: base pay per tonne per million km × tierMultiplier^tier
 * × mass × distance, × the first-contact multiplier when flagged.
 */
export function contractPayout(input: PayoutInput, config: GameConfig): number {
  const { cargoType, tier, massTonnes, distanceMillionKm, firstContact } = input;
  const pay =
    cargoType.basePayPerTonnePerMillionKm *
    cargoType.tierPayMultiplier ** tier *
    massTonnes *
    distanceMillionKm *
    (firstContact ? config.firstContactPayoutMultiplier : 1);
  return Math.round(pay);
}