"use client";

import { ArrowRight } from "lucide-react";
import { type ReactNode, useEffect, useState } from "react";
import { App, Button, Image, Tag } from "antd";

import { fetchPrompts, type Prompt } from "@/services/api/prompts";
import { navigationTools } from "@/lib/navigation-tools";
import { cn } from "@/lib/utils";

function Highlighter({
  action,
  color,
  children,
}: {
  action: "highlight" | "underline";
  color: string;
  children: ReactNode;
}) {
  return (
    <span className="relative inline-block px-1">
      {action === "highlight" ? (
        <span className="absolute inset-x-0 bottom-0 top-1 rounded-sm opacity-45" style={{ backgroundColor: color }} />
      ) : (
        <span className="absolute inset-x-0 bottom-0 h-1 rounded-full opacity-80" style={{ backgroundColor: color }} />
      )}
      <span className="relative font-medium text-stone-800 dark:text-stone-200">{children}</span>
    </span>
  );
}

export default function IndexPage() {
  const { message } = App.useApp();
  const [primaryTool] = navigationTools;
  const [promptShowcase, setPromptShowcase] = useState<Prompt[]>([]);
  const [previewIndex, setPreviewIndex] = useState(0);
  const [previewOpen, setPreviewOpen] = useState(false);

  useEffect(() => {
    void fetchPrompts({ pageSize: 12 }).then((data) => setPromptShowcase(data.items)).catch((error) => message.error(error instanceof Error ? error.message : "获取提示词失败"));
  }, [message]);

  return (
    <main className="relative h-full overflow-y-auto bg-background bg-[radial-gradient(#e5e7eb_1px,transparent_1px)] [background-size:16px_16px] text-stone-950 dark:bg-[radial-gradient(rgba(245,245,244,.18)_1px,transparent_1px)] dark:text-stone-100">
      <section className="relative mx-auto min-h-[calc(100vh-4rem)] max-w-7xl overflow-hidden px-6">
        <div className="pointer-events-none absolute left-[15%] top-24 size-20 rounded-full border border-dashed border-stone-200 dark:border-stone-800" />
        <div className="pointer-events-none absolute right-[23%] top-[48%] size-20 rounded-full border border-dashed border-stone-200 dark:border-stone-800" />

        <div className="relative flex min-h-[620px] flex-col items-center justify-center pt-10 text-center">
          <h1 className="ai-title-aurora max-w-5xl text-balance text-5xl font-semibold tracking-normal sm:text-7xl lg:text-8xl">
            无限画布
          </h1>
          <p className="mt-8 max-w-3xl text-balance text-lg leading-8 text-stone-500 dark:text-stone-400">
            在<Highlighter action="underline" color="#FF9800">无限画布</Highlighter>中生成、连接和重组<Highlighter action="highlight" color="#87CEFA">图片、文字与图形</Highlighter>，让创作从单次生成变成连续推演。
          </p>
          <div className="mt-10 flex flex-wrap items-center justify-center gap-3">
            <Button type="primary" size="large" href={`/${primaryTool.slug}`} icon={<ArrowRight className="size-4" />} iconPlacement="end">
              开始使用
            </Button>
            <Button size="large" href="/canvas">
              打开画布
            </Button>
          </div>
        </div>

        <section className="relative mx-auto mb-20 max-w-6xl border-t border-stone-200 pt-12 dark:border-stone-800">
          <div className="mb-8 grid gap-4 md:grid-cols-[1fr_auto_1fr] md:items-start">
            <div />
            <div className="max-w-2xl text-center">
              <h2 className="text-3xl font-semibold text-stone-950 dark:text-stone-100">沉淀每一次好结果</h2>
              <p className="mt-3 text-base leading-7 text-stone-500 dark:text-stone-400">
                收藏稳定出图的提示词、参考风格和结果图片，让下一次创作从已有经验开始。
              </p>
            </div>
            <Button type="link" href="/prompts" className="justify-self-center md:justify-self-end" icon={<ArrowRight className="size-4" />} iconPlacement="end">
              查看提示词库
            </Button>
          </div>
          <div className="grid auto-rows-[210px] gap-4 md:grid-cols-4">
            {promptShowcase.map((item, index) => (
              <button
                key={item.id}
                type="button"
                onClick={() => {
                  setPreviewIndex(index);
                  setPreviewOpen(true);
                }}
                className={cn(
                  "group relative cursor-pointer overflow-hidden border border-stone-200 bg-stone-100 text-left dark:border-stone-800 dark:bg-stone-900",
                  index === 0 && "md:col-span-2 md:row-span-2",
                  index === 3 && "md:col-span-2",
                )}
              >
                <img src={item.coverUrl} alt={item.title} className="h-full w-full object-cover transition duration-500 group-hover:scale-[1.03]" />
                <div className="absolute inset-x-0 bottom-0 bg-gradient-to-t from-black/70 via-black/35 to-transparent p-4 text-white">
                  <div className="mb-2 flex flex-wrap gap-1.5">
                    {item.tags.slice(0, 2).map((tag) => (
                      <Tag key={tag} variant="filled" className="m-0 bg-white/15 text-[11px] text-white backdrop-blur">
                        {tag}
                      </Tag>
                    ))}
                  </div>
                  <h3 className="text-sm font-medium">{item.title}</h3>
                  <p className="mt-1 line-clamp-2 text-xs leading-5 text-white/75">{item.prompt}</p>
                </div>
              </button>
            ))}
          </div>
        </section>
      </section>
      <Image.PreviewGroup
        preview={{
          open: previewOpen,
          current: previewIndex,
          onOpenChange: setPreviewOpen,
          onChange: setPreviewIndex,
        }}
      >
        <div className="hidden">
          {promptShowcase.map((item) => <Image key={item.id} src={item.coverUrl} alt={item.title} />)}
        </div>
      </Image.PreviewGroup>
    </main>
  );
}