ai-learning-platform/frontend/src/app/marketplace/page.tsx

'use client';

import { useEffect, useState } from 'react';
import Link from 'next/link';
import { Skeleton } from '@/components/ui/skeleton';
import { Button } from '@/components/ui/button';
import { Badge } from '@/components/ui/badge';
import { useT } from '@/i18n';
import { API_BASE } from '@/lib/config';
import { ShoppingBag, CheckCircle, Heart } from 'lucide-react';

interface MarketplaceSkill {
  id: string; name: string; description: string; icon: string;
  category: string; difficulty: string; tags: string[];
  price: number | null; purchased: boolean; sortOrder: number;
}

export default function MarketplacePage() {
  const t = useT();
  const [skills, setSkills] = useState<MarketplaceSkill[]>([]);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    const url = `${API_BASE}/skills/marketplace`;
    fetch(url, { credentials: 'include' })
      .then((r) => r.json())
      .then((data) => {
        setSkills(Array.isArray(data) ? data : []);
      })
      .catch(() => {})
      .finally(() => setLoading(false));
  }, []);

  return (
    <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-12">
      <div className="mb-6">
        <h1 className="text-3xl font-bold text-foreground">{t.marketplace.title}</h1>
        <p className="mt-2 text-muted-foreground">{t.marketplace.desc}</p>
      </div>

      <div className="flex items-center justify-between gap-3 bg-rose-50 dark:bg-rose-950/20 border border-rose-200 dark:border-rose-900 rounded-xl p-4 mb-8">
        <div className="flex items-center gap-3">
          <Heart className="w-5 h-5 text-rose-600 dark:text-rose-400 shrink-0" />
          <p className="text-sm text-foreground">{t.marketplace.freeNote}</p>
        </div>
        <Link
          href="/donate"
          className="shrink-0 text-sm font-medium text-rose-600 dark:text-rose-400 hover:underline"
        >
          {t.donate.toDonate} →
        </Link>
      </div>

      {loading ? (
        <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
          {[1, 2, 3, 4, 5, 6].map((i) => (
            <Skeleton key={i} className="h-52 rounded-2xl" />
          ))}
        </div>
      ) : (
        <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
          {skills.map((skill) => (
            <div
              key={skill.id}
              className="bg-card rounded-2xl border-2 border-border p-6 transition-all hover:shadow-md flex flex-col"
            >
              <div className="flex items-start gap-3 mb-3">
                <span className="text-3xl">{skill.icon}</span>
                <div className="flex-1 min-w-0">
                  <h3 className="font-semibold text-foreground">{skill.name}</h3>
                  <p className="text-sm text-muted-foreground mt-0.5 line-clamp-2">{skill.description}</p>
                </div>
              </div>

              <div className="flex items-center gap-2 mb-3">
                <span
                  className={`text-xs px-2 py-0.5 rounded-full ${
                    skill.difficulty === 'beginner'
                      ? 'bg-green-100 text-green-700'
                      : skill.difficulty === 'intermediate'
                      ? 'bg-yellow-100 text-yellow-700'
                      : 'bg-red-100 text-red-700'
                  }`}
                >
                  {(t.skills as any)[skill.difficulty]}
                </span>
                <span className="text-xs text-muted-foreground">
                  {(t.skills.categories as any)[skill.category] || skill.category}
                </span>
              </div>

              <div className="flex flex-wrap gap-1 mb-4">
                {skill.tags.slice(0, 3).map((tag) => (
                  <span key={tag} className="text-xs px-1.5 py-0.5 bg-muted text-muted-foreground rounded">
                    {tag}
                  </span>
                ))}
              </div>

              <div className="mt-auto flex items-center gap-2">
                <Badge variant="secondary" className="gap-1">
                  <CheckCircle className="h-3.5 w-3.5" />
                  {t.marketplace.free}
                </Badge>
                <Button asChild size="sm" variant="default" className="ml-auto">
                  <Link href={`/sandbox?skill=${skill.id}`}>{t.skills.apply}</Link>
                </Button>
              </div>
            </div>
          ))}
        </div>
      )}

      {!loading && skills.length === 0 && (
        <div className="text-center py-20">
          <ShoppingBag className="h-12 w-12 text-muted-foreground mx-auto mb-4" />
          <p className="text-muted-foreground">{t.common.noData}</p>
        </div>
      )}
    </div>
  );
}