import { useGame } from "../../context/GameContext.js";

const formatTimeUntilReset = (): string => {
  const now = new Date();
  // Mirror the server's PST/PDT-based rollover: challenges reset at PST midnight
  const nowAsPST = new Date(now.toLocaleString("en-US", { timeZone: "America/Los_Angeles" }));
  const tomorrowMidnightPST = new Date(nowAsPST);
  tomorrowMidnightPST.setDate(tomorrowMidnightPST.getDate() + 1);
  tomorrowMidnightPST.setHours(0, 0, 0, 0);
  const pstOffset = nowAsPST.getTime() - now.getTime();
  const resetAt = new Date(tomorrowMidnightPST.getTime() - pstOffset);
  const msRemaining = resetAt.getTime() - now.getTime();
  const hoursRemaining = Math.floor(msRemaining / (1000 * 60 * 60));
  const minutesRemaining = Math.floor((msRemaining % (1000 * 60 * 60)) / (1000 * 60));
  return `${String(hoursRemaining)}h ${String(minutesRemaining)}m`;
};

export const DailyChallengePanel = (): React.JSX.Element => {
  const { state, formatNumber } = useGame();

  if (!state) return <section className="panel"><p>Loading...</p></section>;

  const { dailyChallenges } = state;

  if (!dailyChallenges) {
    return (
      <section className="panel daily-challenge-panel">
        <h2>📅 Daily Challenges</h2>
        <p className="daily-challenge-subtitle">Load the game to generate today's challenges!</p>
      </section>
    );
  }

  const completedCount = dailyChallenges.challenges.filter((c) => c.completed).length;

  return (
    <section className="panel daily-challenge-panel">
      <h2>📅 Daily Challenges</h2>
      <div className="daily-challenge-header">
        <p className="daily-challenge-subtitle">
          Complete challenges for bonus 💎 crystals! Resets in{" "}
          <strong>{formatTimeUntilReset()}</strong> (PST midnight).
        </p>
        <p className="daily-challenge-progress">
          {completedCount} / {dailyChallenges.challenges.length} completed
        </p>
      </div>

      <div className="daily-challenge-list">
        {dailyChallenges.challenges.map((challenge) => {
          const progressPercent = Math.min(
            100,
            Math.floor((challenge.progress / challenge.target) * 100),
          );

          return (
            <div
              key={challenge.id}
              className={`daily-challenge-card ${challenge.completed ? "completed" : ""}`}
            >
              <div className="daily-challenge-info">
                <h3 className="daily-challenge-label">{challenge.label}</h3>
                <p className="daily-challenge-reward">
                  Reward: <strong>💎 {formatNumber(challenge.rewardCrystals)} crystals</strong>
                </p>
              </div>

              <div className="daily-challenge-right">
                {challenge.completed ? (
                  <span className="daily-challenge-done">✅ Complete!</span>
                ) : (
                  <>
                    <p className="daily-challenge-count">
                      {formatNumber(challenge.progress)} / {formatNumber(challenge.target)}
                    </p>
                    <div className="daily-challenge-bar-track">
                      <div
                        className="daily-challenge-bar-fill"
                        style={{ width: `${String(progressPercent)}%` }}
                      />
                    </div>
                  </>
                )}
              </div>
            </div>
          );
        })}
      </div>
    </section>
  );
};