'use client';

import { useEffect, useState } from 'react';
import { Card } from '@/components/ui/card';
import { Badge } from '@/components/ui/badge';
import { Skeleton } from '@/components/ui/skeleton';
import { ExternalLink, Link as LinkIcon, DollarSign, ArrowUpRight, BarChart3 } from 'lucide-react';
import { API_BASE } from '@/lib/config';
import { useT } from '@/i18n';

interface AffiliateLink {
  id: number;
  title: string;
  description: string | null;
  url: string;
  thumbnail: string | null;
  isFeatured: boolean;
  tags: string | null;
  program?: { name: string; provider?: string | null };
}

interface AffiliateStats {
  totalClicks: number;
  totalRevenue: number;
  topLinks: { id: number; title: string; clicks: number; estimatedRevenue: number }[];
}

function SkeletonCard() {
  return (
    <Card className="p-5">
      <div className="flex items-start gap-3">
        <Skeleton className="h-10 w-10 rounded-xl" />
        <div className="flex-1">
          <Skeleton className="h-5 w-1/2 mb-2" />
          <Skeleton className="h-4 w-full mb-1" />
          <Skeleton className="h-4 w-3/4" />
        </div>
      </div>
    </Card>
  );
}

export default function AffiliatePage() {
  const t = useT();
  const [links, setLinks] = useState<AffiliateLink[]>([]);
  const [stats, setStats] = useState<AffiliateStats | null>(null);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    Promise.all([
      fetch(`${API_BASE}/affiliate/links`).then((r) => r.json()),
      fetch(`${API_BASE}/affiliate/stats`).then((r) => r.json()),
    ])
      .then(([linksData, statsData]) => {
        setLinks(linksData.links || []);
        setStats(statsData);
      })
      .catch(() => {})
      .finally(() => setLoading(false));
  }, []);

  async function handlePromote(link: AffiliateLink) {
    try {
      const res = await fetch(`${API_BASE}/affiliate/click/${link.id}`, { method: 'POST' });
      const data = await res.json();
      if (data.redirectUrl) window.open(data.redirectUrl, '_blank', 'noopener,noreferrer');
    } catch {
      window.open(link.url, '_blank', 'noopener,noreferrer');
    }
  }

  return (
    <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-12">
      <div className="mb-10">
        <h1 className="text-3xl font-bold text-foreground">{t.affiliate.title}</h1>
        <p className="mt-2 text-muted-foreground">{t.affiliate.desc}</p>
      </div>

      <div className="grid grid-cols-1 md:grid-cols-3 gap-4 mb-8">
        <Card className="p-5">
          <div className="flex items-center justify-between">
            <div>
              <p className="text-sm text-muted-foreground">{t.affiliate.totalClicks}</p>
              <p className="text-2xl font-bold text-foreground mt-1">
                {(stats?.totalClicks ?? 0).toLocaleString()}
              </p>
            </div>
            <div className="w-10 h-10 bg-blue-100 dark:bg-blue-900/30 rounded-xl flex items-center justify-center">
              <ArrowUpRight className="w-5 h-5 text-blue-600 dark:text-blue-400" />
            </div>
          </div>
        </Card>
        <Card className="p-5">
          <div className="flex items-center justify-between">
            <div>
              <p className="text-sm text-muted-foreground">{t.affiliate.totalRevenue}</p>
              <p className="text-2xl font-bold text-foreground mt-1">
                ¥{(stats?.totalRevenue ?? 0).toLocaleString()}
              </p>
            </div>
            <div className="w-10 h-10 bg-green-100 dark:bg-green-900/30 rounded-xl flex items-center justify-center">
              <DollarSign className="w-5 h-5 text-green-600 dark:text-green-400" />
            </div>
          </div>
        </Card>
        <Card className="p-5">
          <div className="flex items-center justify-between">
            <div>
              <p className="text-sm text-muted-foreground">{t.affiliate.partnerTools}</p>
              <p className="text-2xl font-bold text-foreground mt-1">{links.length}</p>
            </div>
            <div className="w-10 h-10 bg-purple-100 dark:bg-purple-900/30 rounded-xl flex items-center justify-center">
              <BarChart3 className="w-5 h-5 text-purple-600 dark:text-purple-400" />
            </div>
          </div>
        </Card>
      </div>

      <div className="mb-8">
        <h2 className="text-xl font-semibold text-foreground mb-4">{t.affiliate.recommendTools}</h2>
        {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) => (
              <SkeletonCard key={i} />
            ))}
          </div>
        ) : links.length === 0 ? (
          <Card className="p-8 text-center text-muted-foreground">{t.affiliate.noData}</Card>
        ) : (
          <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
            {links.map((link) => (
              <Card key={link.id} className="p-5 hover:shadow-md transition-all">
                <div className="flex items-start gap-3 mb-3">
                  <div className="w-10 h-10 bg-brand-100 dark:bg-brand-900/30 rounded-xl flex items-center justify-center shrink-0">
                    <LinkIcon className="w-5 h-5 text-brand-600 dark:text-brand-400" />
                  </div>
                  <div className="flex-1 min-w-0">
                    <div className="flex items-center gap-2 flex-wrap">
                      <h3 className="font-semibold">{link.title}</h3>
                      {link.isFeatured && <Badge variant="secondary">推荐</Badge>}
                    </div>
                    {link.program && (
                      <p className="text-xs text-muted-foreground mt-0.5">{link.program.name}</p>
                    )}
                    <p className="text-sm text-muted-foreground line-clamp-2 mt-1">
                      {link.description}
                    </p>
                  </div>
                </div>
                <button
                  onClick={() => handlePromote(link)}
                  className="w-full text-center py-2 px-3 bg-brand-600 hover:bg-brand-700 text-white rounded-lg transition-colors text-sm"
                >
                  {t.affiliate.promoteLink}
                </button>
                {link.tags && (
                  <div className="flex gap-1 mt-3 flex-wrap">
                    {link.tags
                      .split(',')
                      .slice(0, 3)
                      .map((tag) => (
                        <Badge key={tag} variant="outline" className="text-xs">
                          {tag}
                        </Badge>
                      ))}
                  </div>
                )}
              </Card>
            ))}
          </div>
        )}
      </div>

      {stats && stats.topLinks.length > 0 && (
        <div>
          <h2 className="text-xl font-semibold text-foreground mb-4">{t.affiliate.ranking}</h2>
          <Card className="overflow-hidden">
            <div className="overflow-x-auto">
              <table className="w-full">
                <thead className="bg-muted/50">
                  <tr>
                    <th className="text-left p-4 text-sm font-medium text-muted-foreground">
                      {t.affiliate.tool}
                    </th>
                    <th className="text-right p-4 text-sm font-medium text-muted-foreground">
                      {t.affiliate.clicks}
                    </th>
                    <th className="text-right p-4 text-sm font-medium text-muted-foreground">
                      {t.affiliate.revenue}
                    </th>
                  </tr>
                </thead>
                <tbody>
                  {stats.topLinks.map((item, index) => (
                    <tr key={item.id} className="border-t border-border">
                      <td className="p-4 font-medium">
                        <span className="text-muted-foreground mr-2">#{index + 1}</span>
                        {item.title}
                      </td>
                      <td className="p-4 text-right">{item.clicks.toLocaleString()}</td>
                      <td className="p-4 text-right font-medium text-green-600">
                        ¥{item.estimatedRevenue.toFixed(2)}
                      </td>
                    </tr>
                  ))}
                </tbody>
              </table>
            </div>
          </Card>
        </div>
      )}

      <p className="mt-10 text-xs text-muted-foreground text-center max-w-2xl mx-auto">
        {t.affiliate.disclaimer}
      </p>
    </div>
  );
}