Achievements

user_badges: defineTable({
  userId: v.id("users"),
  badgeId: v.string(),
  unlockedAt: v.number(),
}).index("by_user", ["userId"])

const BADGES_META: Record<string, { title: string; icon: string }> = {
  'hello-world': { title: '"Hello World" Master', icon: 'BookOpen' },
  'streak-5': { title: '5 Day Streak', icon: 'Flame' },
  'bug-hunter': { title: 'Bug Hunter', icon: 'Bug' },
  'algo-architect': { title: 'Algo Architect', icon: 'Cpu' },
  'css-wizard': { title: 'CSS Wizard', icon: 'Palette' },
};

export const awardBadge = mutation({
  args: { badgeId: v.string() },
  handler: async (ctx, args) => {
    const userId = await getAuthUserId(ctx);
    if (!userId) return;

    const existing = await ctx.db
      .query("user_badges")
      .withIndex("by_user", q => q.eq("userId", userId))
      .filter(q => q.eq(q.field("badgeId"), args.badgeId))
      .first();
    
    if (!existing) {
      await ctx.db.insert("user_badges", {
        userId,
        badgeId: args.badgeId,
        unlockedAt: Date.now()
      });
    }
  }
});

export const getRecentBadges = query({
  args: {},
  handler: async (ctx) => {
    const userId = await getAuthUserId(ctx);
    if (!userId) return [];

    const userBadges = await ctx.db
      .query("user_badges")
      .withIndex("by_user", q => q.eq("userId", userId))
      .order("desc") 
      .take(3);

    return userBadges.map(b => ({
      ...b,
      meta: BADGES_META[b.badgeId] || { 
        title: 'Unknown Badge', 
        icon: 'Lock' 
      }
    }));
  }
});

// 1. Complete objective (e.g., 5-day streak)
// 2. System checks criteria
// 3. awardBadge mutation called
// 4. Notification sent (if enabled)
// 5. Badge appears in dashboard