first commit

src/components/EpisodeSelector.tsx

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+/* eslint-disable @next/next/no-img-element */
+
+import { useRouter } from 'next/navigation';
+import React, {
+  useCallback,
+  useEffect,
+  useMemo,
+  useRef,
+  useState,
+} from 'react';
+
+import { SearchResult } from '@/lib/types';
+import { getVideoResolutionFromM3u8, processImageUrl } from '@/lib/utils';
+
+// 定义视频信息类型
+interface VideoInfo {
+  quality: string;
+  loadSpeed: string;
+  pingTime: number;
+  hasError?: boolean; // 添加错误状态标识
+}
+
+interface EpisodeSelectorProps {
+  /** 总集数 */
+  totalEpisodes: number;
+  /** 剧集标题 */
+  episodes_titles: string[];
+  /** 每页显示多少集，默认 50 */
+  episodesPerPage?: number;
+  /** 当前选中的集数（1 开始） */
+  value?: number;
+  /** 用户点击选集后的回调 */
+  onChange?: (episodeNumber: number) => void;
+  /** 换源相关 */
+  onSourceChange?: (source: string, id: string, title: string) => void;
+  currentSource?: string;
+  currentId?: string;
+  videoTitle?: string;
+  videoYear?: string;
+  availableSources?: SearchResult[];
+  sourceSearchLoading?: boolean;
+  sourceSearchError?: string | null;
+  /** 预计算的测速结果，避免重复测速 */
+  precomputedVideoInfo?: Map<string, VideoInfo>;
+}
+
+/**
+ * 选集组件，支持分页、自动滚动聚焦当前分页标签，以及换源功能。
+ */
+const EpisodeSelector: React.FC<EpisodeSelectorProps> = ({
+  totalEpisodes,
+  episodes_titles,
+  episodesPerPage = 50,
+  value = 1,
+  onChange,
+  onSourceChange,
+  currentSource,
+  currentId,
+  videoTitle,
+  availableSources = [],
+  sourceSearchLoading = false,
+  sourceSearchError = null,
+  precomputedVideoInfo,
+}) => {
+  const router = useRouter();
+  const pageCount = Math.ceil(totalEpisodes / episodesPerPage);
+
+  // 存储每个源的视频信息
+  const [videoInfoMap, setVideoInfoMap] = useState<Map<string, VideoInfo>>(
+    new Map()
+  );
+  const [attemptedSources, setAttemptedSources] = useState<Set<string>>(
+    new Set()
+  );
+
+  // 使用 ref 来避免闭包问题
+  const attemptedSourcesRef = useRef<Set<string>>(new Set());
+  const videoInfoMapRef = useRef<Map<string, VideoInfo>>(new Map());
+
+  // 同步状态到 ref
+  useEffect(() => {
+    attemptedSourcesRef.current = attemptedSources;
+  }, [attemptedSources]);
+
+  useEffect(() => {
+    videoInfoMapRef.current = videoInfoMap;
+  }, [videoInfoMap]);
+
+  // 主要的 tab 状态：'episodes' 或 'sources'
+  // 当只有一集时默认展示 "换源"，并隐藏 "选集" 标签
+  const [activeTab, setActiveTab] = useState<'episodes' | 'sources'>(
+    totalEpisodes > 1 ? 'episodes' : 'sources'
+  );
+
+  // 当前分页索引（0 开始）
+  const initialPage = Math.floor((value - 1) / episodesPerPage);
+  const [currentPage, setCurrentPage] = useState<number>(initialPage);
+
+  // 是否倒序显示
+  const [descending, setDescending] = useState<boolean>(false);
+
+  // 根据 descending 状态计算实际显示的分页索引
+  const displayPage = useMemo(() => {
+    if (descending) {
+      return pageCount - 1 - currentPage;
+    }
+    return currentPage;
+  }, [currentPage, descending, pageCount]);
+
+  // 获取视频信息的函数 - 移除 attemptedSources 依赖避免不必要的重新创建
+  const getVideoInfo = useCallback(async (source: SearchResult) => {
+    const sourceKey = `${source.source}-${source.id}`;
+
+    // 使用 ref 获取最新的状态，避免闭包问题
+    if (attemptedSourcesRef.current.has(sourceKey)) {
+      return;
+    }
+
+    // 获取第一集的URL
+    if (!source.episodes || source.episodes.length === 0) {
+      return;
+    }
+    const episodeUrl =
+      source.episodes.length > 1 ? source.episodes[1] : source.episodes[0];
+
+    // 标记为已尝试
+    setAttemptedSources((prev) => new Set(prev).add(sourceKey));
+
+    try {
+      const info = await getVideoResolutionFromM3u8(episodeUrl);
+      setVideoInfoMap((prev) => new Map(prev).set(sourceKey, info));
+    } catch (error) {
+      // 失败时保存错误状态
+      setVideoInfoMap((prev) =>
+        new Map(prev).set(sourceKey, {
+          quality: '错误',
+          loadSpeed: '未知',
+          pingTime: 0,
+          hasError: true,
+        })
+      );
+    }
+  }, []);
+
+  // 当有预计算结果时，先合并到videoInfoMap中
+  useEffect(() => {
+    if (precomputedVideoInfo && precomputedVideoInfo.size > 0) {
+      // 原子性地更新两个状态，避免时序问题
+      setVideoInfoMap((prev) => {
+        const newMap = new Map(prev);
+        precomputedVideoInfo.forEach((value, key) => {
+          newMap.set(key, value);
+        });
+        return newMap;
+      });
+
+      setAttemptedSources((prev) => {
+        const newSet = new Set(prev);
+        precomputedVideoInfo.forEach((info, key) => {
+          if (!info.hasError) {
+            newSet.add(key);
+          }
+        });
+        return newSet;
+      });
+
+      // 同步更新 ref，确保 getVideoInfo 能立即看到更新
+      precomputedVideoInfo.forEach((info, key) => {
+        if (!info.hasError) {
+          attemptedSourcesRef.current.add(key);
+        }
+      });
+    }
+  }, [precomputedVideoInfo]);
+
+  // 读取本地“优选和测速”开关，默认开启
+  const [optimizationEnabled] = useState<boolean>(() => {
+    if (typeof window !== 'undefined') {
+      const saved = localStorage.getItem('enableOptimization');
+      if (saved !== null) {
+        try {
+          return JSON.parse(saved);
+        } catch {
+          /* ignore */
+        }
+      }
+    }
+    return true;
+  });
+
+  // 当切换到换源tab并且有源数据时，异步获取视频信息 - 移除 attemptedSources 依赖避免循环触发
+  useEffect(() => {
+    const fetchVideoInfosInBatches = async () => {
+      if (
+        !optimizationEnabled || // 若关闭测速则直接退出
+        activeTab !== 'sources' ||
+        availableSources.length === 0
+      )
+        return;
+
+      // 筛选出尚未测速的播放源
+      const pendingSources = availableSources.filter((source) => {
+        const sourceKey = `${source.source}-${source.id}`;
+        return !attemptedSourcesRef.current.has(sourceKey);
+      });
+
+      if (pendingSources.length === 0) return;
+
+      const batchSize = Math.ceil(pendingSources.length / 2);
+
+      for (let start = 0; start < pendingSources.length; start += batchSize) {
+        const batch = pendingSources.slice(start, start + batchSize);
+        await Promise.all(batch.map(getVideoInfo));
+      }
+    };
+
+    fetchVideoInfosInBatches();
+    // 依赖项保持与之前一致
+  }, [activeTab, availableSources, getVideoInfo, optimizationEnabled]);
+
+  // 升序分页标签
+  const categoriesAsc = useMemo(() => {
+    return Array.from({ length: pageCount }, (_, i) => {
+      const start = i * episodesPerPage + 1;
+      const end = Math.min(start + episodesPerPage - 1, totalEpisodes);
+      return { start, end };
+    });
+  }, [pageCount, episodesPerPage, totalEpisodes]);
+
+  // 根据 descending 状态决定分页标签的排序和内容
+  const categories = useMemo(() => {
+    if (descending) {
+      // 倒序时，label 也倒序显示
+      return [...categoriesAsc]
+        .reverse()
+        .map(({ start, end }) => `${end}-${start}`);
+    }
+    return categoriesAsc.map(({ start, end }) => `${start}-${end}`);
+  }, [categoriesAsc, descending]);
+
+  const categoryContainerRef = useRef<HTMLDivElement>(null);
+  const buttonRefs = useRef<(HTMLButtonElement | null)[]>([]);
+
+  // 当分页切换时，将激活的分页标签滚动到视口中间
+  useEffect(() => {
+    const btn = buttonRefs.current[displayPage];
+    const container = categoryContainerRef.current;
+    if (btn && container) {
+      // 手动计算滚动位置，只滚动分页标签容器
+      const containerRect = container.getBoundingClientRect();
+      const btnRect = btn.getBoundingClientRect();
+      const scrollLeft = container.scrollLeft;
+
+      // 计算按钮相对于容器的位置
+      const btnLeft = btnRect.left - containerRect.left + scrollLeft;
+      const btnWidth = btnRect.width;
+      const containerWidth = containerRect.width;
+
+      // 计算目标滚动位置，使按钮居中
+      const targetScrollLeft = btnLeft - (containerWidth - btnWidth) / 2;
+
+      // 平滑滚动到目标位置
+      container.scrollTo({
+        left: targetScrollLeft,
+        behavior: 'smooth',
+      });
+    }
+  }, [displayPage, pageCount]);
+
+  // 处理换源tab点击，只在点击时才搜索
+  const handleSourceTabClick = () => {
+    setActiveTab('sources');
+  };
+
+  const handleCategoryClick = useCallback(
+    (index: number) => {
+      if (descending) {
+        // 在倒序时，需要将显示索引转换为实际索引
+        setCurrentPage(pageCount - 1 - index);
+      } else {
+        setCurrentPage(index);
+      }
+    },
+    [descending, pageCount]
+  );
+
+  const handleEpisodeClick = useCallback(
+    (episodeNumber: number) => {
+      onChange?.(episodeNumber);
+    },
+    [onChange]
+  );
+
+  const handleSourceClick = useCallback(
+    (source: SearchResult) => {
+      onSourceChange?.(source.source, source.id, source.title);
+    },
+    [onSourceChange]
+  );
+
+  const currentStart = currentPage * episodesPerPage + 1;
+  const currentEnd = Math.min(
+    currentStart + episodesPerPage - 1,
+    totalEpisodes
+  );
+
+  return (
+    <div className='md:ml-2 px-4 py-0 h-full rounded-xl bg-black/10 dark:bg-white/5 flex flex-col border border-white/0 dark:border-white/30 overflow-hidden'>
+      {/* 主要的 Tab 切换 - 无缝融入设计 */}
+      <div className='flex mb-1 -mx-6 flex-shrink-0'>
+        {totalEpisodes > 1 && (
+          <div
+            onClick={() => setActiveTab('episodes')}
+            className={`flex-1 py-3 px-6 text-center cursor-pointer transition-all duration-200 font-medium
+              ${
+                activeTab === 'episodes'
+                  ? 'text-green-600 dark:text-green-400'
+                  : 'text-gray-700 hover:text-green-600 bg-black/5 dark:bg-white/5 dark:text-gray-300 dark:hover:text-green-400 hover:bg-black/3 dark:hover:bg-white/3'
+              }
+            `.trim()}
+          >
+            选集
+          </div>
+        )}
+        <div
+          onClick={handleSourceTabClick}
+          className={`flex-1 py-3 px-6 text-center cursor-pointer transition-all duration-200 font-medium
+            ${
+              activeTab === 'sources'
+                ? 'text-green-600 dark:text-green-400'
+                : 'text-gray-700 hover:text-green-600 bg-black/5 dark:bg-white/5 dark:text-gray-300 dark:hover:text-green-400 hover:bg-black/3 dark:hover:bg-white/3'
+            }
+          `.trim()}
+        >
+          换源
+        </div>
+      </div>
+
+      {/* 选集 Tab 内容 */}
+      {activeTab === 'episodes' && (
+        <>
+          {/* 分类标签 */}
+          <div className='flex items-center gap-4 mb-4 border-b border-gray-300 dark:border-gray-700 -mx-6 px-6 flex-shrink-0'>
+            <div className='flex-1 overflow-x-auto' ref={categoryContainerRef}>
+              <div className='flex gap-2 min-w-max'>
+                {categories.map((label, idx) => {
+                  const isActive = idx === displayPage;
+                  return (
+                    <button
+                      key={label}
+                      ref={(el) => {
+                        buttonRefs.current[idx] = el;
+                      }}
+                      onClick={() => handleCategoryClick(idx)}
+                      className={`w-20 relative py-2 text-sm font-medium transition-colors whitespace-nowrap flex-shrink-0 text-center 
+                        ${
+                          isActive
+                            ? 'text-green-500 dark:text-green-400'
+                            : 'text-gray-700 hover:text-green-600 dark:text-gray-300 dark:hover:text-green-400'
+                        }
+                      `.trim()}
+                    >
+                      {label}
+                      {isActive && (
+                        <div className='absolute bottom-0 left-0 right-0 h-0.5 bg-green-500 dark:bg-green-400' />
+                      )}
+                    </button>
+                  );
+                })}
+              </div>
+            </div>
+            {/* 向上/向下按钮 */}
+            <button
+              className='flex-shrink-0 w-8 h-8 rounded-md flex items-center justify-center text-gray-700 hover:text-green-600 hover:bg-gray-100 dark:text-gray-300 dark:hover:text-green-400 dark:hover:bg-white/20 transition-colors transform translate-y-[-4px]'
+              onClick={() => {
+                // 切换集数排序（正序/倒序）
+                setDescending((prev) => !prev);
+              }}
+            >
+              <svg
+                className='w-4 h-4'
+                fill='none'
+                stroke='currentColor'
+                viewBox='0 0 24 24'
+              >
+                <path
+                  strokeLinecap='round'
+                  strokeLinejoin='round'
+                  strokeWidth='2'
+                  d='M7 16V4m0 0L3 8m4-4l4 4m6 0v12m0 0l4-4m-4 4l-4-4'
+                />
+              </svg>
+            </button>
+          </div>
+
+          {/* 集数网格 */}
+          <div className='flex flex-wrap gap-3 overflow-y-auto flex-1 content-start pb-4'>
+            {(() => {
+              const len = currentEnd - currentStart + 1;
+              const episodes = Array.from({ length: len }, (_, i) =>
+                descending ? currentEnd - i : currentStart + i
+              );
+              return episodes;
+            })().map((episodeNumber) => {
+              const isActive = episodeNumber === value;
+              return (
+                <button
+                  key={episodeNumber}
+                  onClick={() => handleEpisodeClick(episodeNumber - 1)}
+                  className={`h-10 min-w-10 px-3 py-2 flex items-center justify-center text-sm font-medium rounded-md transition-all duration-200 whitespace-nowrap font-mono
+                    ${
+                      isActive
+                        ? 'bg-green-500 text-white shadow-lg shadow-green-500/25 dark:bg-green-600'
+                        : 'bg-gray-200 text-gray-700 hover:bg-gray-300 hover:scale-105 dark:bg-white/10 dark:text-gray-300 dark:hover:bg-white/20'
+                    }`.trim()}
+                >
+                  {(() => {
+                    const title = episodes_titles?.[episodeNumber - 1];
+                    if (!title) {
+                      return episodeNumber;
+                    }
+                    // 如果匹配"第X集"格式，提取中间的数字
+                    const match = title.match(/第(\d+)集/);
+                    if (match) {
+                      return match[1];
+                    }
+                    return title;
+                  })()}
+                </button>
+              );
+            })}
+          </div>
+        </>
+      )}
+
+      {/* 换源 Tab 内容 */}
+      {activeTab === 'sources' && (
+        <div className='flex flex-col h-full mt-4'>
+          {sourceSearchLoading && (
+            <div className='flex items-center justify-center py-8'>
+              <div className='animate-spin rounded-full h-8 w-8 border-b-2 border-green-500'></div>
+              <span className='ml-2 text-sm text-gray-600 dark:text-gray-300'>
+                搜索中...
+              </span>
+            </div>
+          )}
+
+          {sourceSearchError && (
+            <div className='flex items-center justify-center py-8'>
+              <div className='text-center'>
+                <div className='text-red-500 text-2xl mb-2'>⚠️</div>
+                <p className='text-sm text-red-600 dark:text-red-400'>
+                  {sourceSearchError}
+                </p>
+              </div>
+            </div>
+          )}
+
+          {!sourceSearchLoading &&
+            !sourceSearchError &&
+            availableSources.length === 0 && (
+              <div className='flex items-center justify-center py-8'>
+                <div className='text-center'>
+                  <div className='text-gray-400 text-2xl mb-2'>📺</div>
+                  <p className='text-sm text-gray-600 dark:text-gray-300'>
+                    暂无可用的换源
+                  </p>
+                </div>
+              </div>
+            )}
+
+          {!sourceSearchLoading &&
+            !sourceSearchError &&
+            availableSources.length > 0 && (
+              <div className='flex-1 overflow-y-auto space-y-2 pb-20'>
+                {availableSources
+                  .sort((a, b) => {
+                    const aIsCurrent =
+                      a.source?.toString() === currentSource?.toString() &&
+                      a.id?.toString() === currentId?.toString();
+                    const bIsCurrent =
+                      b.source?.toString() === currentSource?.toString() &&
+                      b.id?.toString() === currentId?.toString();
+                    if (aIsCurrent && !bIsCurrent) return -1;
+                    if (!aIsCurrent && bIsCurrent) return 1;
+                    return 0;
+                  })
+                  .map((source, index) => {
+                    const isCurrentSource =
+                      source.source?.toString() === currentSource?.toString() &&
+                      source.id?.toString() === currentId?.toString();
+                    return (
+                      <div
+                        key={`${source.source}-${source.id}`}
+                        onClick={() =>
+                          !isCurrentSource && handleSourceClick(source)
+                        }
+                        className={`flex items-start gap-3 px-2 py-3 rounded-lg transition-all select-none duration-200 relative
+                      ${
+                        isCurrentSource
+                          ? 'bg-green-500/10 dark:bg-green-500/20 border-green-500/30 border'
+                          : 'hover:bg-gray-200/50 dark:hover:bg-white/10 hover:scale-[1.02] cursor-pointer'
+                      }`.trim()}
+                      >
+                        {/* 封面 */}
+                        <div className='flex-shrink-0 w-12 h-20 bg-gray-300 dark:bg-gray-600 rounded overflow-hidden'>
+                          {source.episodes && source.episodes.length > 0 && (
+                            <img
+                              src={processImageUrl(source.poster)}
+                              alt={source.title}
+                              className='w-full h-full object-cover'
+                              onError={(e) => {
+                                const target = e.target as HTMLImageElement;
+                                target.style.display = 'none';
+                              }}
+                            />
+                          )}
+                        </div>
+
+                        {/* 信息区域 */}
+                        <div className='flex-1 min-w-0 flex flex-col justify-between h-20'>
+                          {/* 标题和分辨率 - 顶部 */}
+                          <div className='flex items-start justify-between gap-3 h-6'>
+                            <div className='flex-1 min-w-0 relative group/title'>
+                              <h3 className='font-medium text-base truncate text-gray-900 dark:text-gray-100 leading-none'>
+                                {source.title}
+                              </h3>
+                              {/* 标题级别的 tooltip - 第一个元素不显示 */}
+                              {index !== 0 && (
+                                <div className='absolute bottom-full left-1/2 transform -translate-x-1/2 mb-2 px-3 py-1 bg-gray-800 text-white text-xs rounded-md shadow-lg opacity-0 invisible group-hover/title:opacity-100 group-hover/title:visible transition-all duration-200 ease-out delay-100 whitespace-nowrap z-[500] pointer-events-none'>
+                                  {source.title}
+                                  <div className='absolute top-full left-1/2 transform -translate-x-1/2 w-0 h-0 border-l-4 border-r-4 border-t-4 border-transparent border-t-gray-800'></div>
+                                </div>
+                              )}
+                            </div>
+                            {(() => {
+                              const sourceKey = `${source.source}-${source.id}`;
+                              const videoInfo = videoInfoMap.get(sourceKey);
+
+                              if (videoInfo && videoInfo.quality !== '未知') {
+                                if (videoInfo.hasError) {
+                                  return (
+                                    <div className='bg-gray-500/10 dark:bg-gray-400/20 text-red-600 dark:text-red-400 px-1.5 py-0 rounded text-xs flex-shrink-0 min-w-[50px] text-center'>
+                                      检测失败
+                                    </div>
+                                  );
+                                } else {
+                                  // 根据分辨率设置不同颜色：2K、4K为紫色，1080p、720p为绿色，其他为黄色
+                                  const isUltraHigh = ['4K', '2K'].includes(
+                                    videoInfo.quality
+                                  );
+                                  const isHigh = ['1080p', '720p'].includes(
+                                    videoInfo.quality
+                                  );
+                                  const textColorClasses = isUltraHigh
+                                    ? 'text-purple-600 dark:text-purple-400'
+                                    : isHigh
+                                    ? 'text-green-600 dark:text-green-400'
+                                    : 'text-yellow-600 dark:text-yellow-400';
+
+                                  return (
+                                    <div
+                                      className={`bg-gray-500/10 dark:bg-gray-400/20 ${textColorClasses} px-1.5 py-0 rounded text-xs flex-shrink-0 min-w-[50px] text-center`}
+                                    >
+                                      {videoInfo.quality}
+                                    </div>
+                                  );
+                                }
+                              }
+
+                              return null;
+                            })()}
+                          </div>
+
+                          {/* 源名称和集数信息 - 垂直居中 */}
+                          <div className='flex items-center justify-between'>
+                            <span className='text-xs px-2 py-1 border border-gray-500/60 rounded text-gray-700 dark:text-gray-300'>
+                              {source.source_name}
+                            </span>
+                            {source.episodes.length > 1 && (
+                              <span className='text-xs text-gray-500 dark:text-gray-400 font-medium'>
+                                {source.episodes.length} 集
+                              </span>
+                            )}
+                          </div>
+
+                          {/* 网络信息 - 底部 */}
+                          <div className='flex items-end h-6'>
+                            {(() => {
+                              const sourceKey = `${source.source}-${source.id}`;
+                              const videoInfo = videoInfoMap.get(sourceKey);
+                              if (videoInfo) {
+                                if (!videoInfo.hasError) {
+                                  return (
+                                    <div className='flex items-end gap-3 text-xs'>
+                                      <div className='text-green-600 dark:text-green-400 font-medium text-xs'>
+                                        {videoInfo.loadSpeed}
+                                      </div>
+                                      <div className='text-orange-600 dark:text-orange-400 font-medium text-xs'>
+                                        {videoInfo.pingTime}ms
+                                      </div>
+                                    </div>
+                                  );
+                                } else {
+                                  return (
+                                    <div className='text-red-500/90 dark:text-red-400 font-medium text-xs'>
+                                      无测速数据
+                                    </div>
+                                  ); // 占位div
+                                }
+                              }
+                            })()}
+                          </div>
+                        </div>
+                      </div>
+                    );
+                  })}
+                <div className='flex-shrink-0 mt-auto pt-2 border-t border-gray-400 dark:border-gray-700'>
+                  <button
+                    onClick={() => {
+                      if (videoTitle) {
+                        router.push(
+                          `/search?q=${encodeURIComponent(videoTitle)}`
+                        );
+                      }
+                    }}
+                    className='w-full text-center text-xs text-gray-500 dark:text-gray-400 hover:text-green-500 dark:hover:text-green-400 transition-colors py-2'
+                  >
+                    影片匹配有误？点击去搜索
+                  </button>
+                </div>
+              </div>
+            )}
+        </div>
+      )}
+    </div>
+  );
+};
+
+export default EpisodeSelector;