const HOST = "guanghulab.com";
const PREFIX = "/code/bingshuo/";
const REPOSITORIES = new Set([
  "guanghu-ice-heart",
  "hololake-system-architecture",
  "grok-build-upstream-mirror",
]);

export function normalizeCodeChannelRepository(value) {
  let url;
  try {
    url = new URL(String(value).trim().replace(/^repo:\/\//u, "https://"));
  } catch {
    throw new Error(
      "INVALID_PUBLISH_REPOSITORY: use repo://guanghulab.com/code/bingshuo/<repository>",
    );
  }
  if (url.username || url.password) {
    throw new Error("PUBLISH_REPOSITORY_CREDENTIALS_FORBIDDEN");
  }
  const pathname = url.pathname.replace(/\.git$/u, "").replace(/\/+$/u, "");
  const slug = pathname.startsWith(PREFIX)
    ? pathname.slice(PREFIX.length)
    : "";
  if (url.hostname !== HOST || !REPOSITORIES.has(slug)) {
    throw new Error(
      "NON_CANONICAL_CODE_CHANNEL_REPOSITORY: only the three registered /code/ repositories are current",
    );
  }
  return `repo://${HOST}${PREFIX}${slug}`;
}

export function normalizePublishTarget(value = "main") {
  const target = String(value).trim() || "main";
  if (
    !/^(?!\/)(?!.*(?:\.\.|\/\/|@\{|[~^:?*\[\\]))[A-Za-z0-9._/-]+$/u.test(
      target,
    ) ||
    target.endsWith("/") ||
    target.endsWith(".")
  ) {
    throw new Error("INVALID_PUBLISH_TARGET: use an exact Git branch name");
  }
  return target;
}

export function publishLeaseResource(repository, target = "main") {
  return `${normalizeCodeChannelRepository(repository)}#${normalizePublishTarget(target)}`;
}

export const currentCodeChannelRepositories = Object.freeze([
  "repo://guanghulab.com/code/bingshuo/guanghu-ice-heart",
  "repo://guanghulab.com/code/bingshuo/hololake-system-architecture",
  "repo://guanghulab.com/code/bingshuo/grok-build-upstream-mirror",
]);