'use client';

import { useEffect, useRef, useState } from 'react';
import Link from 'next/link';
import { GlassCard } from '@/components/ui/glass-card';
import { CASES } from '@/lib/constants';
import { ArrowRight, Building2, TrendingUp } from 'lucide-react';

export function CasesSection() {
  const [isVisible, setIsVisible] = useState(false);
  const sectionRef = useRef<HTMLElement>(null);

  useEffect(() => {
    const observer = new IntersectionObserver(
      ([entry]) => {
        if (entry?.isIntersecting) {
          setIsVisible(true);
        }
      },
      { threshold: 0.1 }
    );

    if (sectionRef.current) {
      observer.observe(sectionRef.current);
    }

    return () => observer.disconnect();
  }, []);

  return (
    <section
      ref={sectionRef}
      id="cases"
      className="py-24 md:py-32 relative overflow-hidden bg-[#FAFAFA]"
    >
      <div className="absolute inset-0 pointer-events-none">
        <div className="absolute top-0 left-0 w-full h-px bg-gradient-to-r from-transparent via-[#E5E5E5] to-transparent" />
        <div className="absolute bottom-0 left-0 w-full h-px bg-gradient-to-r from-transparent via-[#E5E5E5] to-transparent" />
      </div>

      <div className="container-wide relative z-10">
        <div className="text-center mb-16">
          <div
            className={`
              opacity-0 translate-y-4
              ${isVisible ? 'animate-fade-in-up' : ''}
            `}
          >
            <span className="inline-flex items-center gap-2 px-4 py-2 rounded-full bg-[#C41E3A]/10 text-[#C41E3A] text-sm font-medium mb-4">
              <TrendingUp className="w-4 h-4" />
              成功案例
            </span>
          </div>

          <h2
            className={`
              text-3xl sm:text-4xl font-semibold text-[#171717] mb-4
              opacity-0 translate-y-4
              ${isVisible ? 'animate-fade-in-up stagger-1' : ''}
            `}
          >
            客户成功案例
          </h2>

          <p
            className={`
              text-lg text-[#525252] max-w-2xl mx-auto
              opacity-0 translate-y-4
              ${isVisible ? 'animate-fade-in-up stagger-2' : ''}
            `}
          >
            以专业实力赢得客户信赖，用技术创新创造商业价值
          </p>
        </div>

        <div className="grid lg:grid-cols-3 gap-6 md:gap-8">
          {CASES.map((caseItem, index) => (
            <Link key={caseItem.id} href={`/cases/${caseItem.id}`}>
              <GlassCard
                variant="elevated"
                className="overflow-hidden group cursor-pointer"
              >
                <div
                  className={`
                    opacity-0 translate-y-4
                    ${isVisible ? 'animate-fade-in-up' : ''}
                  `}
                  style={{ animationDelay: `${(index + 3) * 100}ms` }}
                >
                  <div className="relative h-48 bg-gradient-to-br from-[#C41E3A]/10 to-[#D4A574]/10 overflow-hidden">
                    <div className="absolute inset-0 flex items-center justify-center">
                      <Building2 className="w-16 h-16 text-[#C41E3A]/30 group-hover:scale-110 transition-transform duration-500" />
                    </div>
                    <div className="absolute top-4 left-4">
                      <span className="px-3 py-1 bg-white/90 backdrop-blur-sm rounded-full text-xs font-medium text-[#C41E3A]">
                        {caseItem.industry}
                      </span>
                    </div>
                  </div>

                  <div className="p-6">
                    <h3 className="text-lg font-semibold text-[#171717] mb-2 group-hover:text-[#C41E3A] transition-colors duration-300">
                      {caseItem.title}
                    </h3>

                    <p className="text-sm text-[#525252] mb-4 line-clamp-2">
                      {caseItem.description}
                    </p>

                    <div className="grid grid-cols-3 gap-2 mb-4">
                      {caseItem.results.map((result) => (
                        <div
                          key={result.label}
                          className="text-center p-2 bg-[#FAFAFA] rounded-lg"
                        >
                          <div className="text-sm font-semibold text-[#C41E3A]">
                            {result.value}
                          </div>
                          <div className="text-xs text-[#737373] truncate">
                            {result.label}
                          </div>
                        </div>
                      ))}
                    </div>

                    <div className="flex flex-wrap gap-2 mb-4">
                      {caseItem.tags.map((tag) => (
                        <span
                          key={tag}
                          className="px-2 py-1 bg-[#171717]/5 rounded text-xs text-[#525252]"
                        >
                          {tag}
                        </span>
                      ))}
                    </div>

                    <div className="flex items-center justify-center text-sm font-medium text-[#C41E3A] group-hover:gap-2 transition-all">
                      查看详情
                      <ArrowRight className="w-4 h-4 ml-1" />
                    </div>
                  </div>
                </div>
              </GlassCard>
            </Link>
          ))}
        </div>
      </div>
    </section>
  );
}
