/**
 * 任务-页面详情组件
 */

'use client';

import { useState, useEffect, useRef } from 'react';
import { parseDownloadError } from '@/lib/download-errors';
import {
  detailInkButtonClass,
  detailMetaLabelClass,
  detailMetaValueClass,
  detailOutlineButtonClass,
  detailPanelClass,
  detailSectionTitleClass,
  detailThumbActiveClass,
  detailThumbIdleClass,
} from '@/components/detail/detail-styles';

interface Asset {
  id: string;
  assetType: string;
  fileUrl: string;
  fileName: string;
  fileSize: number;
  sortOrder: number;
}

interface TaskPageDetailProps {
  material: {
    id: string;
    taskNo?: string;
    productModel: string;
    categoryName: string;
    sceneName: string;
    taskStatus?: string;
    taskFetchedAt?: string;
    assets: Asset[];
  };
  canDownloadSource: boolean;
  onDownload: (type: string, assetId?: string) => Promise<void>;
  onBack?: () => void;
  showToast?: (message: string, options?: { variant?: 'success' | 'error' }) => void;
}

export default function TaskPageDetail({
  material,
  canDownloadSource,
  onDownload,
  onBack,
  showToast,
}: TaskPageDetailProps) {
  const [currentImageIndex, setCurrentImageIndex] = useState(0);
  const [downloading, setDownloading] = useState(false);
  const [downloadType, setDownloadType] = useState<string>('');
  
  // 轮播相关状态
  const [autoPlayEnabled, setAutoPlayEnabled] = useState(true);

  // 按类型分组资产
  // ⚠️ 注意：preview是S3存储的压缩预览图（小文件），用于网页展示
  // zip是本地存储的原图压缩包（大文件），用于下载
  const mainImages = material.assets.filter((a) => a.assetType === 'preview').sort((a, b) => a.sortOrder - b.sortOrder);
  const zipFile = material.assets.find((a) => a.assetType === 'zip');
  
  // 轮播逻辑
  const autoPlayTimerRef = useRef<NodeJS.Timeout | null>(null);
  
  useEffect(() => {
    // 清理之前的定时器
    if (autoPlayTimerRef.current) {
      clearInterval(autoPlayTimerRef.current);
    }
    
    // 只在有多张原图时启用轮播
    if (autoPlayEnabled && mainImages.length > 1) {
        autoPlayTimerRef.current = setInterval(() => {
        setCurrentImageIndex((prev) => (prev + 1) % mainImages.length);
      }, 5000); // 5秒轮播
    }
    
    return () => {
      if (autoPlayTimerRef.current) {
        clearInterval(autoPlayTimerRef.current);
      }
    };
  }, [currentImageIndex, autoPlayEnabled, mainImages.length]);

  // 格式化文件大小
  const formatBytes = (bytes: number) => {
    if (bytes === 0) return '0 B';
    const k = 1024;
    const sizes = ['B', 'KB', 'MB', 'GB'];
    const i = Math.floor(Math.log(bytes) / Math.log(k));
    return Math.round(bytes / Math.pow(k, i) * 100) / 100 + ' ' + sizes[i];
  };

  return (
    <div className="space-y-6">
      {/* 警告：已被外部系统获取 */}
      {material.taskStatus === 'fetched' && material.taskFetchedAt && (
        <div className={`${detailPanelClass} p-4`}>
          <div>
            <h4 className="text-[13px] font-medium text-[#1a1c1d]">此素材已被外部系统获取</h4>
            <p className="mt-1 text-[13px] text-[#6b7075]">
              获取时间：{new Date(material.taskFetchedAt).toLocaleString('zh-CN')}
            </p>
            <p className="text-[13px] text-[#6b7075]">编辑或删除可能影响外部系统使用</p>
          </div>
        </div>
      )}

      <div className="grid grid-cols-1 gap-4 lg:grid-cols-[minmax(0,2fr)_minmax(18rem,1fr)] lg:gap-6">
        {/* 左侧：预览图展示 */}
        <div className="min-w-0 space-y-6">
          {/* 预览图预览区 */}
          {mainImages.length > 0 && (
            <div className={`${detailPanelClass} p-4`}>
              <div className="flex items-center justify-between mb-3">
                <h4 className="text-sm font-medium">
                  预览图 ({currentImageIndex + 1}/{mainImages.length})
                </h4>
                {mainImages.length > 1 && (
              <button
                onClick={() => setAutoPlayEnabled(!autoPlayEnabled)}
                    className="text-[12px] text-[#86898e] hover:text-[#1a1c1d]"
                    type="button"
                  >
                    {autoPlayEnabled ? '暂停轮播' : '开始轮播'}
              </button>
            )}
          </div>
              <div className="relative">
                <img
                  src={mainImages[currentImageIndex]?.fileUrl}
                  alt={`预览图 ${currentImageIndex + 1}`}
                  className="w-full rounded-lg"
                />
              </div>
            </div>
          )}

          {/* 预览图小卡片展示区 */}
          {mainImages.length > 0 && (
            <div className={`${detailPanelClass} p-4`}>
              <h4 className={detailSectionTitleClass}>所有预览图 ({mainImages.length})</h4>
              <div className="flex flex-wrap gap-2">
                {mainImages.map((img, index) => (
                <button
                  key={img.id}
                    onClick={(e) => {
                      e.preventDefault();
                      e.stopPropagation();
                      // 阻止滚动行为
                      const currentScrollY = window.scrollY;
                      setCurrentImageIndex(index);
                      setAutoPlayEnabled(false); // 手动切换时暂停轮播
                      // 保持滚动位置
                      requestAnimationFrame(() => {
                        window.scrollTo(0, currentScrollY);
                      });
                    }}
                    onMouseDown={(e) => {
                      // 阻止默认的鼠标按下行为
                      e.preventDefault();
                  }}
                    className={`relative flex-shrink-0 border-2 rounded overflow-hidden ${
                      index === currentImageIndex
                      ? detailThumbActiveClass
                        : detailThumbIdleClass
                  }`}
                    style={{ width: '84px', height: '84px' }}
                    type="button"
                  >
                    <img
                      src={img.fileUrl}
                      alt={`预览图 ${index + 1}`}
                      className="w-full h-full object-cover"
                    />
                    {index === currentImageIndex && (
                      <div className="absolute inset-0 flex items-center justify-center bg-[#1a1c1d]/20">
                        <svg className="h-6 w-6 text-white" fill="currentColor" viewBox="0 0 20 20">
                          <path fillRule="evenodd" d="M10 18a8 8 0 100-16 8 8 0 000 16zm3.707-9.293a1 1 0 00-1.414-1.414L9 10.586 7.707 9.293a1 1 0 00-1.414 1.414l2 2a1 1 0 001.414 0l4-4z" clipRule="evenodd" />
                        </svg>
                      </div>
                    )}
                </button>
              ))}
              </div>
            </div>
          )}
        </div>

        {/* 右侧：基本信息 + 下载按钮 */}
        <div className="space-y-6">
          {/* 基本信息卡片 */}
          <div className={`${detailPanelClass} p-6`}>
            <h3 className="mb-4 text-[15px] font-semibold tracking-[-0.03em] text-[#1a1c1d]">素材详情</h3>
            <div className="space-y-4">
          <div>
                <p className={detailMetaLabelClass}>任务号</p>
                <p className={detailMetaValueClass}>{material.taskNo}</p>
          </div>
                <div>
                <p className={detailMetaLabelClass}>SPU型号</p>
                <p className={detailMetaValueClass}>{material.productModel}</p>
              </div>
                <div>
                <p className={detailMetaLabelClass}>店铺</p>
                <p className={detailMetaValueClass}>{material.categoryName}</p>
                </div>
              {material.sceneName && (
                  <div>
                  <p className={detailMetaLabelClass}>场景</p>
                  <p className={detailMetaValueClass}>{material.sceneName}</p>
                </div>
              )}
            </div>
          </div>

          {/* ZIP 文件信息和下载按钮 - 使用容器实现sticky，保持相对位置 */}
          <div className="space-y-6 lg:sticky lg:top-24 lg:z-10">
            {/* ZIP 源文件 */}
            {zipFile && (
              <div className={`${detailPanelClass} p-4`}>
                <h4 className={detailSectionTitleClass}>源文件</h4>
                <div className="flex items-center justify-between rounded-[8px] border border-[#e7e8ea] bg-[#fafafa] p-3">
                  <div className="flex-1">
                    <p className="text-[13px] font-medium text-[#1a1c1d]">{zipFile.fileName}</p>
                    <p className="text-[12px] text-[#86898e]">{formatBytes(zipFile.fileSize)}</p>
                  </div>
                  {canDownloadSource ? (
              <button
                      onClick={async () => {
                        setDownloading(true);
                        setDownloadType('zip');
                        try {
                          await onDownload('zip', zipFile.id);
                          setTimeout(() => {
                            setDownloading(false);
                            setDownloadType('');
                          }, 500);
                        } catch (error) {
                          console.error('下载失败:', error);
                          const { message } = parseDownloadError(error);
                          if (showToast) {
                            showToast(message, { variant: 'error' });
                          }
                          setDownloading(false);
                          setDownloadType('');
                        }
                      }}
                disabled={downloading}
                      className={detailInkButtonClass}
                      type="button"
              >
                {downloading && downloadType === 'zip' ? (
                        <div className="flex items-center space-x-2">
                          <svg className="animate-spin h-4 w-4 text-white" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24">
                            <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4"></circle>
                            <path className="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path>
                    </svg>
                    <span>下载中...</span>
                        </div>
                ) : (
                        '下载'
                )}
              </button>
                  ) : (
                    <span className="text-[12px] text-[#86898e]">无权限</span>
                  )}
                </div>
            </div>
          )}

            {/* 返回上一页按钮 */}
            {onBack && (
              <button
                onClick={onBack}
                className={`w-full ${detailOutlineButtonClass}`}
              >
                返回上一页
              </button>
          )}
        </div>
      </div>
    </div>
    </div>
  );
}