"use client";

import { FolderPlus, Search } from "lucide-react";
import { type UIEvent, useEffect, useState } from "react";
import { App, Button, Empty, Input, Spin, Tag } from "antd";

import { PromptCard } from "@/components/prompts/prompt-card";
import { PromptDetailDialog } from "@/components/prompts/prompt-detail-dialog";
import { usePromptList } from "@/components/prompts/use-prompt-list";
import { useCopyText } from "@/hooks/use-copy-text";
import { cn } from "@/lib/utils";
import { useAssetStore } from "@/stores/use-asset-store";
import { ALL_PROMPTS_OPTION, type Prompt } from "@/services/api/prompts";

export default function PromptsPage() {
  const { message } = App.useApp();
  const [titleKeyword, setTitleKeyword] = useState("");
  const [selectedTags, setSelectedTags] = useState<string[]>([]);
  const [selectedCategory, setSelectedCategory] = useState(ALL_PROMPTS_OPTION);
  const [selectedPrompt, setSelectedPrompt] = useState<Prompt | null>(null);
  const addAsset = useAssetStore((state) => state.addAsset);
  const copyText = useCopyText();
  const { query, items: promptItems, tags: promptTags, categories: promptCategoryOptions, total: totalPrompts } = usePromptList({ keyword: titleKeyword, tags: selectedTags, category: selectedCategory });

  useEffect(() => {
    if (query.isError) {
      message.error(query.error instanceof Error ? query.error.message : "获取提示词失败");
    }
  }, [message, query.error, query.isError]);

  const toggleTag = (tag: string) => {
    if (tag === ALL_PROMPTS_OPTION) return setSelectedTags([]);
    setSelectedTags((items) => items.includes(tag) ? items.filter((item) => item !== tag) : [...items, tag]);
  };

  const savePromptAsset = (item: Prompt) => {
    addAsset({ kind: "text", title: item.title, coverUrl: item.coverUrl, tags: item.tags, source: item.category, data: { content: item.prompt }, metadata: { source: "prompt-library", promptId: item.id, githubUrl: item.githubUrl } });
    message.success("已加入我的素材");
  };

  const handleListScroll = (event: UIEvent<HTMLDivElement>) => {
    const target = event.currentTarget;
    if (query.hasNextPage && !query.isFetchingNextPage && target.scrollTop + target.clientHeight >= target.scrollHeight - 160) {
      void query.fetchNextPage();
    }
  };

  return (
    <div className="flex h-full flex-col overflow-hidden bg-background text-stone-800 dark:text-stone-100">
      <main className="min-h-0 flex-1 overflow-y-auto bg-background bg-[radial-gradient(#e5e7eb_1px,transparent_1px)] px-6 py-8 [background-size:16px_16px] dark:bg-[radial-gradient(rgba(245,245,244,.16)_1px,transparent_1px)]" onScroll={handleListScroll}>
        <div className="pb-8">
          <div className="mx-auto max-w-5xl text-center">
            <h1 className="text-4xl font-semibold tracking-tight text-stone-950 dark:text-stone-100">提示词中心</h1>
            <p className="mt-3 text-sm text-stone-500 dark:text-stone-400">共 {totalPrompts} 条提示词，按标题、标签与分类快速查找灵感。</p>
          </div>
          {query.isLoading ? <div className="flex h-60 items-center justify-center"><Spin /></div> : null}
          {!query.isLoading ? (
            <>
              <div className="mx-auto mt-8 w-full max-w-2xl">
                <Input size="large" className="w-full" prefix={<Search className="size-4 text-stone-400" />} value={titleKeyword} placeholder="按标题查询" onChange={(event) => setTitleKeyword(event.target.value)} />
              </div>
              <div className="mx-auto mt-6 grid max-w-6xl gap-3 text-left">
                <div className="grid gap-2 sm:grid-cols-[56px_minmax(0,1fr)] sm:items-start">
                  <div className="pt-2 text-xs font-medium text-stone-500 dark:text-stone-400">分类</div>
                  <div className="flex flex-wrap gap-2">
                    {promptCategoryOptions.map((category) => (
                      <Tag.CheckableTag key={category} checked={selectedCategory === category} className={cn("prompt-filter-tag", selectedCategory === category && "is-active")} onChange={() => setSelectedCategory(category)}>
                        {category}
                      </Tag.CheckableTag>
                    ))}
                  </div>
                </div>
                <div className="grid gap-2 sm:grid-cols-[56px_minmax(0,1fr)] sm:items-start">
                  <div className="pt-2 text-xs font-medium text-stone-500 dark:text-stone-400">标签</div>
                  <div className="flex flex-wrap gap-2">
                    {promptTags.map((tag) => (
                      <Tag.CheckableTag key={tag} checked={tag === ALL_PROMPTS_OPTION ? selectedTags.length === 0 : selectedTags.includes(tag)} className={cn("prompt-filter-tag", (tag === ALL_PROMPTS_OPTION ? selectedTags.length === 0 : selectedTags.includes(tag)) && "is-active")} onChange={() => toggleTag(tag)}>
                        {tag}
                      </Tag.CheckableTag>
                    ))}
                  </div>
                </div>
              </div>
            </>
          ) : null}
        </div>

        {!query.isLoading ? (
          <div>
            <div className="mx-auto grid max-w-7xl gap-5 sm:grid-cols-2 xl:grid-cols-3 2xl:grid-cols-4">
              {promptItems.map((item) => (
                <PromptCard key={item.id} item={item} onOpen={() => setSelectedPrompt(item)} onCopy={() => copyText(item.prompt, "提示词已复制")} extraAction={<Button size="small" icon={<FolderPlus className="size-3.5" />} onClick={() => savePromptAsset(item)}>加入我的素材</Button>} />
              ))}
            </div>
            {promptItems.length === 0 ? <Empty image={Empty.PRESENTED_IMAGE_SIMPLE} description="没有找到匹配的提示词" className="py-16" /> : null}
            <div className="mx-auto mt-6 max-w-7xl text-center text-xs text-stone-500 dark:text-stone-400">{query.isFetchingNextPage ? "加载中..." : query.hasNextPage ? "继续向下滚动加载更多" : promptItems.length > 0 ? "已经到底了" : null}</div>
          </div>
        ) : null}
      </main>

      <PromptDetailDialog prompt={selectedPrompt} onClose={() => setSelectedPrompt(null)} onCopy={(prompt) => copyText(prompt, "提示词已复制")} onSaveAsset={savePromptAsset} />
    </div>
  );
}