'use client';

import { useState } from 'react';
import { GameCard } from '@/components/ui/game-card';
import { Badge } from '@/components/ui/badge';
import { ActionButton } from '@/components/ui/action-button';
import { ScrollArea } from '@/components/ui/scroll-area';
import { ManaBar } from '@/components/ui/mana-bar';
import { Trophy, Lock, CheckCircle, ChevronDown, ChevronUp } from 'lucide-react';
import type { AchievementState } from '@/lib/game/types';
import { ACHIEVEMENTS, getAchievementsByCategory, isAchievementRevealed } from '@/lib/game/data/achievements';
import { GameState } from '@/lib/game/types';

// Map achievement categories to CSS variables for colors
const CATEGORY_COLOR_MAP: Record<string, string> = {
  combat: 'var(--color-danger)',
  progression: 'var(--rarity-legendary)',
  crafting: 'var(--mana-dark)',
  magic: 'var(--mana-water)',
  special: 'var(--mana-stellar)',
};

interface AchievementsProps {
  achievements: AchievementState;
  gameState: Pick<GameState, 'maxFloorReached' | 'totalManaGathered' | 'signedPacts' | 'totalSpellsCast' | 'totalDamageDealt' | 'totalCraftsCompleted'>;
}

export function AchievementsDisplay({ achievements, gameState }: AchievementsProps) {
  const [expandedCategory, setExpandedCategory] = useState<string | null>('combat');
  
  const categories = getAchievementsByCategory();
  const unlockedCount = achievements.unlocked.length;
  const totalCount = Object.keys(ACHIEVEMENTS).length;
  
  // Calculate progress for each achievement
  const getProgress = (achievementId: string): number => {
    const achievement = ACHIEVEMENTS[achievementId];
    if (!achievement) return 0;
    if (achievements.unlocked.includes(achievementId)) return achievement.requirement.value;
    
    const { type, subType } = achievement.requirement;
    
    switch (type) {
      case 'floor':
        if (subType === 'noPacts') {
          return gameState.maxFloorReached >= achievement.requirement.value && gameState.signedPacts.length === 0
            ? achievement.requirement.value
            : gameState.maxFloorReached;
        }
        return gameState.maxFloorReached;
      case 'spells':
        return gameState.totalSpellsCast || 0;
      case 'damage':
        return gameState.totalDamageDealt || 0;
      case 'mana':
        return gameState.totalManaGathered || 0;
      case 'pact':
        return gameState.signedPacts.length;
      case 'craft':
        return gameState.totalCraftsCompleted || 0;
      default:
        return achievements.progress[achievementId] || 0;
    }
  };
  
  return (
    <GameCard variant="default" className="w-full">
      <div className="flex items-center gap-2 mb-3">
        <Trophy className="w-4 h-4 text-[var(--mana-light)]" />
        <h3 className="text-[var(--mana-light)] game-panel-title text-xs uppercase tracking-wider">
          Achievements
        </h3>
        <Badge 
          className="ml-auto bg-[var(--bg-sunken)] text-[var(--text-secondary)] border-[var(--border-subtle)]"
          aria-label={`${unlockedCount} out of ${totalCount} achievements unlocked`}
        >
          {unlockedCount} / {totalCount}
        </Badge>
      </div>

      <ScrollArea className="h-64 w-full">
        <div className="space-y-2 pr-2">
          {Object.entries(categories).map(([category, categoryAchievements]) => (
            <div key={category} className="space-y-1">
              <ActionButton
                variant="ghost"
                size="sm"
                className="w-full justify-between text-xs hover:bg-[var(--bg-sunken)]"
                onClick={() => setExpandedCategory(expandedCategory === category ? null : category)}
                aria-expanded={expandedCategory === category}
                aria-label={`${category} category - ${categoryAchievements.filter(a => achievements.unlocked.includes(a.id)).length} of ${categoryAchievements.length} unlocked`}
              >
                <span style={{ color: CATEGORY_COLOR_MAP[category] || 'var(--text-primary)' }}>
                  {category.charAt(0).toUpperCase() + category.slice(1)}
                </span>
                <span className="text-[var(--text-muted)]">
                  {categoryAchievements.filter(a => achievements.unlocked.includes(a.id)).length} / {categoryAchievements.length}
                </span>
                {expandedCategory === category ? (
                  <ChevronUp className="w-4 h-4 text-[var(--text-muted)]" />
                ) : (
                  <ChevronDown className="w-4 h-4 text-[var(--text-muted)]" />
                )}
              </ActionButton>
              
              {expandedCategory === category && (
                <div className="pl-2 space-y-2">
                  {categoryAchievements.map((achievement) => {
                    const isUnlocked = achievements.unlocked.includes(achievement.id);
                    const progress = getProgress(achievement.id);
                    const isRevealed = isAchievementRevealed(achievement, progress);
                    const progressPercent = Math.min(100, (progress / achievement.requirement.value) * 100);
                    
                    if (!isRevealed && !isUnlocked) {
                      return (
                        <div 
                          key={achievement.id} 
                          className="p-2 rounded bg-[var(--bg-sunken)] border border-[var(--border-subtle)]"
                          aria-label="Locked achievement - details hidden"
                        >
                          <div className="flex items-center gap-2 text-[var(--text-muted)]">
                            <Lock className="w-4 h-4" aria-hidden="true" />
                            <span className="text-sm">???</span>
                          </div>
                        </div>
                      );
                    }
                    
                    return (
                      <div
                        key={achievement.id}
                        className={`p-2 rounded border ${
                          isUnlocked
                            ? 'bg-[var(--rarity-legendary-glow)] border-[var(--rarity-legendary)]/50'
                            : 'bg-[var(--bg-sunken)] border-[var(--border-subtle)]'
                        }`}
                      >
                        <div className="flex items-start justify-between mb-1">
                          <div className="flex items-center gap-2">
                            {isUnlocked ? (
                              <CheckCircle className="w-4 h-4 text-[var(--mana-light)]" aria-hidden="true" />
                            ) : (
                              <Trophy className="w-4 h-4 text-[var(--text-muted)]" aria-hidden="true" />
                            )}
                            <span 
                              className={`text-sm font-semibold ${
                                isUnlocked ? 'text-[var(--mana-light)]' : 'text-[var(--text-secondary)]'
                              }`}
                            >
                              {achievement.name}
                            </span>
                          </div>
                          {achievement.reward.title && isUnlocked && (
                            <Badge 
                              className="text-xs bg-[var(--mana-dark)]/20 text-[var(--mana-dark)] border-[var(--mana-dark)]/40"
                              aria-label="Title reward"
                            >
                              Title
                            </Badge>
                          )}
                        </div>
                        
                        <div className="text-xs text-[var(--text-muted)] mb-2">
                          {achievement.desc}
                        </div>
                        
                        {!isUnlocked && (
                          <div className="space-y-1">
                            <ManaBar 
                              value={progress} 
                              max={achievement.requirement.value} 
                              manaType="light"
                              className="h-1.5"
                              aria-label={`Progress: ${Math.round(progressPercent)}%`}
                            />
                            <div className="flex justify-between text-xs text-[var(--text-muted)]">
                              <span>{progress.toLocaleString()} / {achievement.requirement.value.toLocaleString()}</span>
                              <span>{progressPercent.toFixed(0)}%</span>
                            </div>
                          </div>
                        )}
                        
                        {isUnlocked && achievement.reward && (
                          <div className="text-xs text-[var(--mana-light)]/70">
                            Reward: 
                            {achievement.reward.insight && ` +${achievement.reward.insight} Insight`}
                            {achievement.reward.manaBonus && ` +${achievement.reward.manaBonus} Max Mana`}
                            {achievement.reward.damageBonus && ` +${(achievement.reward.damageBonus * 100).toFixed(0)}% Damage`}
                            {achievement.reward.title && ` "${achievement.reward.title}"`}
                          </div>
                        )}
                      </div>
                    );
                  })}
                </div>
              )}
            </div>
          ))}
        </div>
      </ScrollArea>
    </GameCard>
  );
}

AchievementsDisplay.displayName = "AchievementsDisplay";