import type { DailyChallengeState, DailyChallengeType } from "@elysium/types";

/**
 * Increments progress for daily challenges matching the given type.
 * Returns the updated challenge state and any crystals awarded for newly-completed challenges.
 *
 * Note: challenge generation and daily resets are handled server-side only.
 * This utility is purely for client-side progress tracking.
 */
export const updateChallengeProgress = (
  challengeState: DailyChallengeState,
  type: DailyChallengeType,
  amount: number,
): { updatedChallenges: DailyChallengeState; crystalsAwarded: number } => {
  let crystalsAwarded = 0;

  const updatedChallenges: DailyChallengeState = {
    ...challengeState,
    challenges: challengeState.challenges.map((challenge) => {
      if (challenge.type !== type || challenge.completed) return challenge;

      const newProgress = Math.min(challenge.progress + amount, challenge.target);
      const nowCompleted = newProgress >= challenge.target;

      if (nowCompleted) crystalsAwarded += challenge.rewardCrystals;

      return { ...challenge, progress: newProgress, completed: nowCompleted };
    }),
  };

  return { updatedChallenges, crystalsAwarded };
};