const BASE = "/api";

function getToken() {
  return localStorage.getItem("token");
}

async function request(path, { method = "GET", body, auth = true } = {}) {
  const headers = {};
  let payload = body;

  if (body instanceof URLSearchParams) {
    headers["Content-Type"] = "application/x-www-form-urlencoded";
  } else if (body !== undefined) {
    headers["Content-Type"] = "application/json";
    payload = JSON.stringify(body);
  }

  if (auth) {
    const token = getToken();
    if (token) headers["Authorization"] = `Bearer ${token}`;
  }

  const res = await fetch(`${BASE}${path}`, { method, headers, body: payload });

  if (!res.ok) {
    let detail = res.statusText;
    try {
      const data = await res.json();
      detail = data.detail || detail;
    } catch {
      /* тело не JSON */
    }
    throw new Error(typeof detail === "string" ? detail : JSON.stringify(detail));
  }

  if (res.status === 204) return null;
  return res.json();
}

export const api = {
  register: (email, password) =>
    request("/auth/register", { method: "POST", body: { email, password }, auth: false }),

  login: async (email, password) => {
    const form = new URLSearchParams();
    form.set("username", email);
    form.set("password", password);
    const data = await request("/auth/login", { method: "POST", body: form, auth: false });
    localStorage.setItem("token", data.access_token);
    return data;
  },

  logout: () => localStorage.removeItem("token"),

  me: () => request("/auth/me"),

  listTemplates: () => request("/templates"),
  createTemplate: (payload) => request("/templates", { method: "POST", body: payload }),

  listInstances: () => request("/instances"),
  createInstance: (payload) => request("/instances", { method: "POST", body: payload }),
  getInstance: (id) => request(`/instances/${id}`),
  getInstanceStatus: (id) => request(`/instances/${id}/status`),
  instanceAction: (id, action) =>
    request(`/instances/${id}/action`, { method: "POST", body: { action } }),
  getInstanceLive: (id) => request(`/instances/${id}/live`),
  getInstanceIp: (id) => request(`/instances/${id}/ip`),
  deleteInstance: (id) => request(`/instances/${id}`, { method: "DELETE" }),
  getConsole: (id) => request(`/instances/${id}/console`),

  fetchProxmoxTemplates: () => request("/templates/from-proxmox"),
  deleteTemplate: (id) => request(`/templates/${id}`, { method: "DELETE" }),
  listUsers: () => request("/admin/users"),
  toggleUser: (id) => request(`/admin/users/${id}/toggle-active`, { method: "POST" }),
};