import Link from "next/link";
import { db } from "@/lib/db";
import { PostCard, type PublicPost } from "./components/post-card";

export const dynamic = "force-dynamic";
const pageSize = 20;
type Query = { q?: string; tag?: string; source?: string; author?: string; from?: string; to?: string; attachments?: string; page?: string };

export default async function Home({ searchParams }: { searchParams: Promise<Query> }) {
  const query = await searchParams; const q = query.q?.trim() || ""; const tag = query.tag?.trim() || ""; const author = query.author?.trim() || ""; const sourceId = Number(query.source) || 0; const from = query.from || ""; const to = query.to || ""; const attachments = query.attachments === "1"; const page = Math.max(1, Number(query.page) || 1);
  const where = ["p.visibility='PUBLIC'", "p.hidden=0"]; const args: (string | number)[] = [];
  if (q) { where.push("p.content LIKE ?"); args.push(`%${q}%`); } if (tag) { where.push("p.tags_json LIKE ?"); args.push(`%${JSON.stringify(tag).slice(1, -1)}%`); } if (author) { where.push("u.username LIKE ?"); args.push(`%${author}%`); } if (sourceId) { where.push("s.id=?"); args.push(sourceId); } if (from) { where.push("date(COALESCE(p.remote_created_at,p.created_at)) >= date(?)"); args.push(from); } if (to) { where.push("date(COALESCE(p.remote_created_at,p.created_at)) <= date(?)"); args.push(to); } if (attachments) where.push("p.attachments_json <> '[]'");
  const joins = " FROM posts p JOIN users u ON u.id=p.author_id LEFT JOIN sources s ON s.id=p.source_id "; const predicate = ` WHERE ${where.join(" AND ")}`;
  const total = Number((db.prepare(`SELECT count(*) count${joins}${predicate}`).get(...args) as { count: number }).count); const pages = Math.max(1, Math.ceil(total / pageSize)); const safePage = Math.min(page, pages);
  const posts = db.prepare(`SELECT p.*,u.username,s.name,s.remote_display_name,s.base_url AS source_base_url,(SELECT count(*) FROM comments c WHERE c.post_id=p.id AND c.hidden=0) comment_count,(SELECT count(*) FROM reactions r WHERE r.post_id=p.id) reaction_count${joins}${predicate} ORDER BY COALESCE(p.remote_created_at,p.created_at) DESC LIMIT ? OFFSET ?`).all(...args, pageSize, (safePage - 1) * pageSize) as PublicPost[];
  const sources = db.prepare("SELECT id,name FROM sources WHERE is_enabled=1 ORDER BY name").all() as { id: number; name: string }[];
  const params = new URLSearchParams(); for (const [key, value] of Object.entries(query)) if (value && key !== "page") params.set(key, value); const pageHref = (target: number) => { const next = new URLSearchParams(params); next.set("page", String(target)); return `/?${next}`; };
  return <><section className="space"><div><h1>公開 Memos Hub</h1><p className="muted">聚合朋友們公開分享的筆記。</p></div><Link className="button" href="/dashboard">發佈／連接來源</Link></section><form className="search-form" method="get"><input name="q" defaultValue={q} placeholder="搜尋公開貼文" /><input name="tag" defaultValue={tag} placeholder="標籤" /><input name="author" defaultValue={author} placeholder="作者" /><select name="source" defaultValue={sourceId || ""}><option value="">所有來源</option>{sources.map((source) => <option key={source.id} value={source.id}>{source.name}</option>)}</select><label>從<input name="from" type="date" defaultValue={from} /></label><label>到<input name="to" type="date" defaultValue={to} /></label><label className="check"><input name="attachments" type="checkbox" value="1" defaultChecked={attachments} />只看附件</label><button>搜尋</button></form><p className="meta">共 {total} 篇公開貼文</p>{posts.length ? posts.map((post) => <PostCard post={post} key={post.id} />) : <p className="muted">尚無符合的公開貼文。</p>}{pages > 1 && <nav className="pagination" aria-label="貼文分頁">{safePage > 1 && <Link href={pageHref(safePage - 1)}>← 上一頁</Link>}<span>第 {safePage}／{pages} 頁</span>{safePage < pages && <Link href={pageHref(safePage + 1)}>下一頁 →</Link>}</nav>}</>;
}