"use client";

import { useCallback, useEffect, useState } from "react";
import { useSearchParams, useRouter } from "next/navigation";
import Link from "next/link";
import { Search, ArrowLeft, X, MessageSquare } from "lucide-react";

// 匹配搜索结果类型（适配后端API）
type SearchResultItem = {
  id: string;
  awemeId: string;
  type: 'video' | 'image';
  rank: number;
  snippet: string; // 后端返回的高亮片段，已包含<mark>标签
  video?: {
    aweme_id: string;
    desc: string;
    cover_url: string | null;
    video_url: string | null;
    duration_ms: number;
    author: {
      sec_uid: string;
      nickname: string;
      avatar_url: string | null;
    };
  };
  imagePost?: {
    aweme_id: string;
    desc: string;
    cover_url: string | null;
    author: {
      sec_uid: string;
      nickname: string;
      avatar_url: string | null;
    };
  };
};

export default function SearchPage() {
  const searchParams = useSearchParams();
  const router = useRouter();
  const queryParam = searchParams.get("q") || "";

  const [query, setQuery] = useState(queryParam);
  const [results, setResults] = useState<SearchResultItem[]>([]);
  const [loading, setLoading] = useState(false);
  const [searched, setSearched] = useState(false);

  const performSearch = useCallback(async (q: string) => {
    if (!q.trim()) {
      setResults([]);
      setSearched(false);
      return;
    }

    setLoading(true);
    setSearched(true);
    try {
      const res = await fetch(`/api/search?q=${encodeURIComponent(q.trim())}&limit=60`);
      if (!res.ok) throw new Error("Search failed");
      const data = await res.json();
      setResults(data.results || []);
    } catch (err) {
      console.error("Search error:", err);
      setResults([]);
    } finally {
      setLoading(false);
    }
  }, []);

  // 初始查询
  useEffect(() => {
    if (queryParam) {
      performSearch(queryParam);
    }
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  const handleSearch = (e: React.FormEvent) => {
    e.preventDefault();
    const trimmed = query.trim();
    if (!trimmed) return;
    // 更新 URL
    router.push(`/search?q=${encodeURIComponent(trimmed)}`);
    performSearch(trimmed);
  };

  const handleClear = () => {
    setQuery("");
    setResults([]);
    setSearched(false);
    router.push("/search");
  };

  return (
    <div className="min-h-screen bg-zinc-950 text-white">
      {/* 顶部搜索栏 */}
      <header className="sticky top-0 z-50 bg-zinc-900/80 backdrop-blur-xl border-b border-white/10">
        <div className="max-w-7xl mx-auto px-4 py-4 flex items-center gap-4">
          <button
            onClick={() => router.push("/")}
            className="p-2 rounded-full hover:bg-white/10 transition-colors"
            aria-label="返回首页"
          >
            <ArrowLeft size={24} />
          </button>

          <form onSubmit={handleSearch} className="flex-1 flex items-center gap-3">
            <div className="relative flex-1">
              <input
                type="text"
                value={query}
                onChange={(e) => setQuery(e.target.value)}
                placeholder="搜索视频、图文描述或语音内容..."
                className="w-full bg-white/5 border border-white/10 rounded-full px-5 py-3 pl-12 pr-12 text-white placeholder-white/40 focus:outline-none focus:ring-2 focus:ring-blue-500/50 focus:border-blue-500/50 transition-all"
                autoFocus
              />
              <Search
                size={20}
                className="absolute left-4 top-1/2 -translate-y-1/2 text-white/40"
              />
              {query && (
                <button
                  type="button"
                  onClick={handleClear}
                  className="absolute right-4 top-1/2 -translate-y-1/2 p-1 rounded-full hover:bg-white/10 transition-colors"
                  aria-label="清空"
                >
                  <X size={18} className="text-white/60" />
                </button>
              )}
            </div>
            <button
              type="submit"
              className="px-6 py-3 bg-blue-600 hover:bg-blue-700 rounded-full font-medium transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
              disabled={loading || !query.trim()}
            >
              {loading ? "搜索中..." : "搜索"}
            </button>
          </form>
        </div>
      </header>

      {/* 结果区域 */}
      <main className="max-w-7xl mx-auto px-4 py-8">
        {loading && (
          <div className="flex items-center justify-center py-20">
            <div className="flex flex-col items-center gap-4">
              <div className="w-12 h-12 border-4 border-blue-500/30 border-t-blue-500 rounded-full animate-spin" />
              <p className="text-white/60">正在搜索...</p>
            </div>
          </div>
        )}

        {!loading && searched && results.length === 0 && (
          <div className="flex flex-col items-center justify-center py-20 text-white/60">
            <Search size={64} className="mb-4 opacity-20" />
            <p className="text-xl">未找到相关内容</p>
            <p className="text-sm mt-2">试试其他关键词</p>
          </div>
        )}

        {!loading && !searched && !queryParam && (
          <div className="flex flex-col items-center justify-center py-20 text-white/40">
            <Search size={64} className="mb-4 opacity-20" />
            <p className="text-xl">输入关键词开始搜索</p>
            <p className="text-sm mt-2">支持搜索视频描述、图文描述及语音转写内容</p>
          </div>
        )}

        {!loading && results.length > 0 && (
          <div>
            <div className="mb-6 flex items-center justify-between">
              <h2 className="text-lg text-white/80">
                找到 <span className="text-white font-semibold">{results.length}</span> 个结果
              </h2>
            </div>

            {/* 单列列表布局 */}
            <div className="space-y-4">
              {results.map((item) => {
                const content = item.type === 'video' ? item.video : item.imagePost;
                if (!content) return null;

                return (
                  <div
                    key={item.awemeId}
                    className="bg-white/5 backdrop-blur-sm border border-white/10 rounded-2xl overflow-hidden hover:border-white/20 transition-all hover:-translate-y-1"
                  >
                    {/* 主内容区 */}
                    <div className="flex gap-4 p-4">
                      {/* 左侧：封面预览 */}
                      <Link
                        href={`/aweme/${content.aweme_id}`}
                        target="_blank"
                        className="flex-shrink-0 w-64 h-80 sm:w-70 sm:h-96 rounded-xl overflow-hidden bg-zinc-900 group"
                      >
                        <img
                          src={content.cover_url || ""}
                          alt={content.desc}
                          className="w-full h-full object-cover transition-transform duration-300 group-hover:scale-105"
                        />
                      </Link>

                      {/* 右侧：信息区 */}
                      <div className="flex-1 min-w-0 flex flex-col">
                        {/* 类型标签 */}
                        <div className="flex items-center gap-2 mb-2">
                          <span className={`px-2 py-0.5 text-xs rounded ${
                            item.type === 'video' 
                              ? 'bg-blue-600/20 text-blue-300' 
                              : 'bg-purple-600/20 text-purple-300'
                          }`}>
                            {item.type === 'video' ? '视频' : '图文'}
                          </span>
                          <span className="flex items-center gap-1 px-2 py-0.5 bg-green-600/20 text-green-300 text-xs rounded">
                            <MessageSquare size={12} />
                            匹配度: {(item.rank * 100).toFixed(1)}%
                          </span>
                        </div>

                        {/* 描述 */}
                        <Link href={`/aweme/${content.aweme_id}`} target="_blank">
                          <p className="text-white/90 text-sm sm:text-base line-clamp-2 mb-3 hover:text-white transition-colors">
                            {content.desc || "无描述"}
                          </p>
                        </Link>

                        {/* 作者信息 */}
                        <div className="flex items-center gap-2 mb-4">
                          <img
                            src={content.author.avatar_url || ""}
                            alt={content.author.nickname}
                            className="w-6 h-6 rounded-full ring-1 ring-white/20"
                          />
                          <span className="text-xs text-white/60">
                            {content.author.nickname}
                          </span>
                        </div>

                        {/* 匹配详情：展示后端返回的snippet（已包含<mark>标签） */}
                        <div className="space-y-3">
                          <div>
                            <h4 className="flex items-center gap-2 text-xs font-medium text-green-300 mb-1.5">
                              <MessageSquare size={14} />
                              匹配内容
                            </h4>
                            <div
                              className="text-xs text-white/70 bg-white/5 rounded-lg p-2 leading-relaxed"
                              dangerouslySetInnerHTML={{ __html: item.snippet }}
                              style={{
                                wordBreak: 'break-word',
                              }}
                            />
                          </div>
                        </div>
                      </div>
                    </div>
                  </div>
                );
              })}
            </div>
          </div>
        )}
      </main>
    </div>
  );
}
