export const RELEASE_NEWS_CHANNEL = "1558048830770122772";
// A webhook ID is public; its secret URL/token must never be stored here.
export const RELEASE_WEBHOOK_ID = "1561021045211660401";

export type ReleasePost = {
  id: string;
  channel_id: string;
  webhook_id?: string;
  content: string;
  timestamp: string;
};
export type ChangelogEntry = {
  id: string;
  title: string;
  version: string;
  kind: "Alpha" | "Beta" | "Production" | "Bug fix";
  body: string;
  publishedAt: string;
};

export function parseReleasePost(
  post: ReleasePost,
  webhookId = RELEASE_WEBHOOK_ID,
): ChangelogEntry | null {
  if (post.webhook_id !== webhookId || !/^\d{17,20}$/.test(post.id))
    return null;
  const clean = post.content
    .replace(/<@&\d+>/g, "")
    .replace(/(?:^|\n)\s*PLAY THE MINEGEO AT\s*:[\s\S]*$/i, "")
    .replace(/^[\s,.]+/, "")
    .trim();
  const header =
    /^#{1,3}[ \t]+MineGeo[ \t]+(\d+\.\d+\.\d+(?:\.\d+)?)[ \t]+(Alpha|Beta|Production|Bug[ -]fix)([ \t]+[—–:-][^\r\n]*)?[ \t]*\r?\n/i.exec(
      clean,
    );
  if (!header || !Number.isFinite(Date.parse(post.timestamp))) return null;
  const body = clean.slice(header[0].length).trim();
  if (!body) return null;
  const kind = /^bug/i.test(header[2])
    ? "Bug fix"
    : ((header[2][0].toUpperCase() +
        header[2].slice(1).toLowerCase()) as ChangelogEntry["kind"]);
  return {
    id: post.id,
    title: `MineGeo ${header[1]} ${kind}${header[3]?.trimEnd() ?? ""}`,
    version: header[1],
    kind,
    body,
    publishedAt: post.timestamp,
  };
}