'use client';

import { useRef, useEffect, useState } from 'react';
import Image from 'next/image';
import { motion, Variants } from 'framer-motion';
import { useLanguage } from '@/contexts/LanguageContext';
import { useTheme } from '@/contexts/ThemeContext';
import ConsenSysLogo from './ConsenSysLogo';

const itemVariants: Variants = {
  hidden: { y: '3rem', opacity: 0 },
  visible: (i: number) => ({
    y: 0,
    opacity: 1,
    transition: { duration: 0.7, ease: 'easeOut' as const, delay: i * 0.1 }
  })
};

export default function TrustedBySection() {
  const { t } = useLanguage();
  const { theme } = useTheme();
  const isDark = theme === 'dark';
  const scrollRef = useRef<HTMLDivElement>(null);
  const rafRef = useRef<number>(0);
  const isPaused = useRef(false);
  const [isMounted, setIsMounted] = useState(false);

  // 确保组件挂载后才启动滚动
  useEffect(() => {
    setIsMounted(true);
  }, []);

  useEffect(() => {
    if (!isMounted) return;

    const el = scrollRef.current;
    if (!el) return;

    const speed = 1.2;
    let lastTime = performance.now();

    const tick = (currentTime: number) => {
      const deltaTime = currentTime - lastTime;
      lastTime = currentTime;

      if (!isPaused.current && el) {
        el.scrollLeft += speed * (deltaTime / 16); // 标准化到60fps
        if (el.scrollLeft >= el.scrollWidth / 2) {
          el.scrollLeft = 0;
        }
      }
      rafRef.current = requestAnimationFrame(tick);
    };

    // 延迟启动，确保 DOM 完全渲染
    const startTimer = setTimeout(() => {
      rafRef.current = requestAnimationFrame(tick);
    }, 100);

    return () => {
      clearTimeout(startTimer);
      if (rafRef.current) {
        cancelAnimationFrame(rafRef.current);
      }
    };
  }, [isMounted]);

  const logoClass = isDark
    ? 'brightness-0 invert opacity-50 group-hover:opacity-100'
    : 'brightness-0 opacity-50 group-hover:opacity-100';

  const partners = [
    { name: 'BlackRock',  src: '/nav-ireland0.svg',  width: 200, height: 40 },
    { name: 'Coinbase',   src: '/coinbase-10.svg',   width: 180, height: 40 },
    { name: 'Wintermute', src: '/wintermute0.svg',   width: 247, height: 40 },
    { name: 'Circle',     src: '/group0.svg',        width: 156, height: 40 },
    { name: 'ConsenSys',  src: '',                   width: 220, height: 50 },
  ];

  const renderLogo = (partner: typeof partners[number], key: string) => (
    <div
      key={key}
      className="relative flex items-center justify-center transition-all duration-300 group"
      style={{ width: `${partner.width}px`, height: `${partner.height}px` }}
    >
      {partner.name === 'ConsenSys' ? (
        <div className={`w-full h-full flex items-center justify-center transition-all duration-300 ${logoClass}`}>
          <ConsenSysLogo width={partner.width} height={partner.height} />
        </div>
      ) : (
        <Image
          src={partner.src}
          alt={partner.name}
          width={partner.width}
          height={partner.height}
          className={`w-full h-full object-contain transition-all duration-300 ${logoClass}`}
        />
      )}
    </div>
  );

  return (
    <section
      className="flex flex-col items-center justify-center w-full overflow-hidden border-b bg-bg-subtle border-border-normal py-10 gap-8"
      style={{ paddingLeft: 'clamp(16px, 4vw, 80px)', paddingRight: 'clamp(16px, 4vw, 80px)' }}
    >
      <div className="text-lg font-medium text-center font-domine text-text-primary px-4">
        {t('trusted.title')}
      </div>

      {/* ── 移动端：自动滚动 + 手动滑动 ── */}
      <div
        ref={scrollRef}
        className="md:hidden w-full overflow-x-auto cursor-grab active:cursor-grabbing"
        style={{
          WebkitOverflowScrolling: 'touch',
          scrollbarWidth: 'none',
          msOverflowStyle: 'none',
        }}
        onTouchStart={() => { isPaused.current = true; }}
        onTouchEnd={() => { isPaused.current = false; }}
        onTouchCancel={() => { isPaused.current = false; }}
      >
        <div className="flex items-center gap-10" style={{ width: 'max-content', padding: '0 24px' }}>
          {[...partners, ...partners].map((partner, i) => (
            <div
              key={`${partner.name}-${i}`}
              className="flex-shrink-0 flex items-center justify-center h-[60px]"
              style={{ width: `${partner.width}px` }}
            >
              {renderLogo(partner, `m-${partner.name}-${i}`)}
            </div>
          ))}
        </div>
      </div>

      {/* ── 桌面端：单行不换行 ── */}
      <div className="hidden md:flex w-full max-w-[1440px] 2xl:max-w-[1760px] 3xl:max-w-[2200px] flex-row flex-nowrap items-center justify-between gap-x-6">
        {partners.map((partner, index) => (
          <motion.div
            key={partner.name}
            custom={index}
            variants={itemVariants}
            initial="hidden"
            whileInView="visible"
            viewport={{ once: true, amount: 0.3 }}
            className="relative cursor-pointer group flex items-center justify-center"
            style={{
              maxWidth: `${partner.width}px`,
              width: '100%',
              height: `${partner.height}px`,
              flexShrink: 1,
              flexBasis: `${partner.width}px`,
              minWidth: 60,
            }}
          >
            {partner.name === 'ConsenSys' ? (
              <div className={`w-full h-full flex items-center justify-center transition-all duration-300 ${logoClass}`}>
                <ConsenSysLogo width={partner.width} height={partner.height} />
              </div>
            ) : (
              <Image
                src={partner.src}
                alt={partner.name}
                width={partner.width}
                height={partner.height}
                className={`w-full h-full object-contain transition-all duration-300 ${logoClass}`}
              />
            )}
          </motion.div>
        ))}
      </div>
    </section>
  );
}