/*
 * Client-side wiki routes.
 *
 * This module owns page/CMap hash construction and all hash recognition. It
 * returns plain route records and has no knowledge of sessions, permissions,
 * application state or DOM views.
 */

/** Build the client-side route for a wiki page reference. */
function pageRoute(reference) {
  return `#/${encodeURIComponent(reference)}`;
}

/** Build the client-side route for a concept map. */
function cmapRoute(slug) {
  return `#cmap/${encodeURIComponent(slug)}`;
}

/**
 * goal   : Recognize one browser hash as a wiki application route.
 * pre    : hash is the current location hash or another string to inspect.
 * post   : No browser or application state is changed.
 * result : A named route record; unknown and empty hashes produce home.
 * internals: Exact special views are recognized first. Parameterized Todo,
 *            CMap, search and page routes are then decoded into their values.
 */
function parseWikiRoute(hash) {
  const value = String(hash || "");

  switch (value) {
    case "#profile": return { name: "profile" };
    case "#cmaps": return { name: "cmaps" };
    case "#recent": return { name: "recent" };
    case "#bookmarks": return { name: "bookmarks" };
    case "#todos": return { name: "todos" };
    case "#admin": return { name: "admin" };
    case "#admin/users": return { name: "admin-users" };
    case "#admin/mail": return { name: "admin-mail" };
    case "#admin/aliases": return { name: "admin-aliases" };
    case "#admin/orphaned-uploads": return { name: "admin-orphaned-uploads" };
    case "#admin/archived-cmaps": return { name: "admin-archived-cmaps" };
  }

  const todoMatch = value.match(/^#todo\/([^/]+)\/(\d+)$/);
  if (todoMatch) {
    return {
      name: "todo",
      slug: decodeURIComponent(todoMatch[1]),
      number: Number(todoMatch[2])
    };
  }

  const cmapMatch = value.match(/^#cmap\/([^/]+)$/);
  if (cmapMatch) {
    return { name: "cmap", slug: decodeURIComponent(cmapMatch[1]) };
  }

  const searchMatch = value.match(/^#search\/(.+)$/);
  if (searchMatch) {
    return { name: "search", query: decodeURIComponent(searchMatch[1]) };
  }

  const pageMatch = value.match(/^#\/([^/]+)$/);
  if (pageMatch) {
    return { name: "page", slug: decodeURIComponent(pageMatch[1]) };
  }

  return { name: "home" };
}

export { cmapRoute, pageRoute, parseWikiRoute };