import fs from "node:fs";
import path from "node:path";
import fg from "fast-glob";

function readFileSafe(filePath: string): string {
  return fs.readFileSync(filePath, "utf-8");
}

export function getResource(archRoot: string, uri: string) {
  // manifest://<domain>
  if (uri.startsWith("manifest://")) {
    const domain = uri.replace("manifest://", "");
    const mf = path.join(archRoot, domain, "manifest.yaml");
    if (!fs.existsSync(mf)) return { ok: false, error: `Not found: ${uri}` };
    return { ok: true, uri, mimeType: "application/yaml", content: readFileSafe(mf) };
  }

  // views://<domain>/<viewfile-without-ext>
  if (uri.startsWith("views://")) {
    const rest = uri.replace("views://", "");
    const [domain, viewName] = rest.split("/", 2);
    const domainDir = path.join(archRoot, domain);
    const matches = fg.sync([`views/${viewName}.md`], { cwd: domainDir, absolute: true });
    if (!matches.length) return { ok: false, error: `Not found: ${uri}` };
    return {
      ok: true,
      uri,
      mimeType: "text/markdown",
      content: readFileSafe(matches[0]!),
    };
  }

  // register://<domain>/<relative-path>
  if (uri.startsWith("register://")) {
    const rest = uri.replace("register://", "");
    const [domain, rel] = rest.split("/", 2);
    const filePath = path.join(archRoot, domain, rel);
    if (!fs.existsSync(filePath)) return { ok: false, error: `Not found: ${uri}` };
    return { ok: true, uri, mimeType: "application/yaml", content: readFileSafe(filePath) };
  }

  return { ok: false, error: `Unsupported uri: ${uri}` };
}