import type { Metadata } from "next";
import { notFound, redirect } from "next/navigation";
import { db } from "@/lib/db";
import { getSession } from "@/lib/auth";
import { Attachments } from "@/app/components/attachments";
import { Markdown } from "@/app/components/markdown";
import { canonicalTags } from "@/lib/tags";
import { postAuthorLabel } from "@/lib/display";

export const dynamic = "force-dynamic";

export async function generateMetadata({ params }: { params: Promise<{ id: string }> }): Promise<Metadata> {
  const { id: rawId } = await params; const post = db.prepare("SELECT p.content,p.hidden,p.visibility,p.origin,u.username,s.name,s.remote_user,s.base_url AS source_base_url FROM posts p JOIN users u ON u.id=p.author_id LEFT JOIN sources s ON s.id=p.source_id WHERE p.id=?").get(Number(rawId)) as { content: string; hidden: number; visibility: string; origin: string; username: string; name: string | null; remote_user: string | null; source_base_url: string | null } | undefined;
  if (!post || post.hidden || post.visibility !== "PUBLIC") return { title: "找不到貼文" };
  const description = post.content.replace(/\s+/g, " ").slice(0, 160); const author = postAuthorLabel(post);
  return { title: `${author} 的貼文｜Mebbling`, description, openGraph: { title: `${author}｜Mebbling`, description, type: "article" } };
}

export default async function PostPage({ params, searchParams }: { params: Promise<{ id: string }>; searchParams: Promise<{ reported?: string }> }) {
  const { id: rawId } = await params; const id = Number(rawId);
  const post = db.prepare("SELECT p.*,u.username,s.name,s.base_url AS source_base_url,s.remote_user,s.remote_display_name FROM posts p JOIN users u ON u.id=p.author_id LEFT JOIN sources s ON s.id=p.source_id WHERE p.id=?").get(id) as any; const query = await searchParams;
  if (!post || post.hidden) notFound(); const user = await getSession(); if (post.visibility !== "PUBLIC" && post.author_id !== user?.id) redirect("/");
  if (user && post.visibility === "PUBLIC") db.prepare("INSERT INTO reading_history(user_id,post_id) VALUES(?,?) ON CONFLICT(user_id,post_id) DO UPDATE SET last_read_at=CURRENT_TIMESTAMP").run(user.id, id);
  const bookmark = user ? db.prepare("SELECT kind FROM bookmarks WHERE user_id=? AND post_id=?").get(user.id, id) as { kind: string } | undefined : undefined;
  const comments = db.prepare("SELECT c.*,u.username FROM comments c JOIN users u ON u.id=c.author_id WHERE c.post_id=? AND c.hidden=0 ORDER BY c.created_at").all(id) as any[];
  const reactions = db.prepare("SELECT emoji,count(*) count FROM reactions WHERE post_id=? GROUP BY emoji").all(id) as any[];
  let tags: string[] = []; try { tags = canonicalTags(JSON.parse(post.tags_json)); } catch {} const publishedAt = post.remote_created_at || post.created_at; const canExport = Boolean(user && (post.author_id === user.id || (post.source_id && db.prepare("SELECT 1 FROM source_members WHERE source_id=? AND user_id=?").get(post.source_id, user.id)))); return <article><p className="meta">{postAuthorLabel(post)} · {new Date(publishedAt).toLocaleString("zh-TW")}{post.remote_url && <> · <a href={post.remote_url} target="_blank" rel="noreferrer">在 Memos 開啟</a></>}</p>{canExport && <p className="row"><a href={`/api/export/posts/${id}?format=json`}>匯出 JSON</a><a href={`/api/export/posts/${id}?format=markdown`}>匯出 Markdown</a></p>}<section className="card"><Markdown content={post.content} tags={tags} /></section><Attachments json={post.attachments_json} sourceBaseUrl={post.source_base_url} />
    <section className="row">{reactions.map((reaction: any) => <span className="tag" key={reaction.emoji}>{reaction.emoji} {reaction.count}</span>)}{user && <><form action="/api/bookmarks" method="post"><input type="hidden" name="postId" value={id} /><input type="hidden" name="kind" value="saved" /><button>{bookmark?.kind === "saved" ? "取消收藏" : "收藏"}</button></form><form action="/api/bookmarks" method="post"><input type="hidden" name="postId" value={id} /><input type="hidden" name="kind" value="later" /><button>{bookmark?.kind === "later" ? "取消稍後閱讀" : "稍後閱讀"}</button></form></>}{user && ["👍", "❤️", "🎉", "🤔"].map((emoji) => <form action="/api/reactions" method="post" key={emoji}><input type="hidden" name="postId" value={id} /><input type="hidden" name="emoji" value={emoji} /><button>{emoji}</button></form>)}</section>
    <section><h2>留言</h2>{user ? <><form action="/api/comments" method="post"><input type="hidden" name="postId" value={id} /><textarea name="content" required placeholder="在 Hub 留下留言" /><button>送出留言</button></form><details><summary>檢舉這篇貼文</summary>{query.reported && <p>已收到檢舉，管理員會審核。</p>}<form action="/api/reports" method="post"><input type="hidden" name="postId" value={id} /><label>原因<input name="reason" required minLength={3} maxLength={500} /></label><button className="danger">送出檢舉</button></form></details></> : <p>請先登入以留言、互動或檢舉。</p>}{comments.map((comment) => <div className="card" key={comment.id}><strong>@{comment.username}</strong><p>{comment.content}</p><span className="meta">{new Date(comment.created_at).toLocaleString("zh-TW")}</span></div>)}</section>
  </article>;
}