import type { Achievement } from "@elysium/types";
import { useState } from "react";
import { useGame } from "../../context/GameContext.js";
import { LockToggle } from "../ui/LockToggle.js";

const conditionDescription = (achievement: Achievement, formatNumber: (n: number) => string): string => {
  const { condition } = achievement;
  switch (condition.type) {
    case "totalGoldEarned":
      return `Earn ${formatNumber(condition.amount)} total gold`;
    case "totalClicks":
      return `Click ${formatNumber(condition.amount)} times`;
    case "bossesDefeated":
      return `Defeat ${condition.amount} boss${condition.amount > 1 ? "es" : ""}`;
    case "questsCompleted":
      return `Complete ${condition.amount} quest${condition.amount > 1 ? "s" : ""}`;
    case "adventurerTotal":
      return `Recruit ${formatNumber(condition.amount)} total adventurers`;
    case "prestigeCount":
      return `Prestige ${condition.amount} time${condition.amount > 1 ? "s" : ""}`;
    case "equipmentOwned":
      return `Own ${condition.amount} equipment item${condition.amount > 1 ? "s" : ""}`;
  }
};

interface AchievementCardProps {
  achievement: Achievement;
  formatNumber: (n: number) => string;
}

const AchievementCard = ({ achievement, formatNumber }: AchievementCardProps): React.JSX.Element => {
  const isUnlocked = achievement.unlockedAt !== null;

  return (
    <div className={`achievement-card ${isUnlocked ? "unlocked" : "locked"}`}>
      <div className="achievement-icon">{achievement.icon}</div>
      <div className="achievement-info">
        <h3>{achievement.name}</h3>
        <p>{achievement.description}</p>
        <p className="achievement-condition">{conditionDescription(achievement, formatNumber)}</p>
        {achievement.reward?.crystals != null && (
          <p className="achievement-reward">💎 +{achievement.reward.crystals} Crystals</p>
        )}
      </div>
      <div className="achievement-status">
        {isUnlocked ? (
          <span className="achievement-unlocked-badge">✓ Unlocked</span>
        ) : (
          <span className="achievement-locked-badge">🔒</span>
        )}
      </div>
    </div>
  );
};

export const AchievementPanel = (): React.JSX.Element => {
  const { state, formatNumber } = useGame();
  const [showLocked, setShowLocked] = useState(true);

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

  const achievements = state.achievements ?? [];
  const unlocked = achievements.filter((a) => a.unlockedAt !== null);
  const locked = achievements.filter((a) => a.unlockedAt === null);
  const visible = showLocked ? achievements : unlocked;

  return (
    <section className="panel achievement-panel">
      <div className="panel-header">
        <h2>Achievements</h2>
        <LockToggle
          lockedCount={locked.length}
          showLocked={showLocked}
          onToggle={() => { setShowLocked((v) => !v); }}
        />
      </div>
      <p className="achievement-progress">
        {unlocked.length} / {achievements.length} unlocked
      </p>
      <div className="achievement-list">
        {visible.map((achievement) => (
          <AchievementCard key={achievement.id} achievement={achievement} formatNumber={formatNumber} />
        ))}
      </div>
    </section>
  );
};