export const CONFIG_URL = import.meta.env.DEV ? "/config.json" : "./config.json";

export async function requestJson(url, init = {}) {
  const response = await fetch(url, { credentials: "same-origin", ...init });
  const text = await response.text();
  const data = text ? JSON.parse(text) : null;
  if (!response.ok) {
    const detail = data && (data.detail || data.message);
    const err = new Error(detail || `request failed: ${response.status}`);
    err.status = response.status;
    throw err;
  }
  return data;
}

export async function loadAgentConfig() {
  return requestJson(CONFIG_URL);
}

export async function loadSession(config) {
  return requestJson(config.endpoints.session);
}

export function signInUrl(config) {
  const target = config.auth?.authorizeUrl || config.auth?.loginUrl;
  if (!target) return null;
  const next = encodeURIComponent(
    window.location.pathname + window.location.search + window.location.hash,
  );
  return `${target}${target.includes("?") ? "&" : "?"}next=${next}`;
}

export async function requireSession(config) {
  const session = await loadSession(config);
  if (!session?.authenticated) {
    const target = signInUrl(config);
    if (target) window.location.assign(target);
    throw new Error("sign in required");
  }
  return session;
}

export async function callSkill(config, skillName, args) {
  try {
    if (config.auth?.invokeRequiresSession) {
      await requireSession(config);
    }
    const data = await requestJson(
      `${config.endpoints.invoke}/${encodeURIComponent(skillName)}`,
      {
        method: "POST",
        headers: { "content-type": "application/json" },
        body: JSON.stringify({ arguments: args }),
      },
    );
    if (data?.status === "setup_required") {
      throw new Error(data.message || "Setup required before running this workflow.");
    }
    return data;
  } catch (err) {
    if (err?.status === 401) {
      const target = signInUrl(config);
      if (target) window.location.assign(target);
      throw new Error("Session expired. Sign in again to run ContractClock.");
    }
    throw err;
  }
}