// Shared helpers for the Intrusion Detection web UI.

async function api(path, options = {}) {
  const opts = { headers: {}, ...options };
  if (opts.body && typeof opts.body !== "string") {
    opts.headers["Content-Type"] = "application/json";
    opts.body = JSON.stringify(opts.body);
  }
  const res = await fetch(path, opts);
  let data = null;
  try {
    data = await res.json();
  } catch (e) {
    /* non-JSON */
  }
  if (!res.ok) {
    const msg = (data && (data.error || data.message)) || `HTTP ${res.status}`;
    throw new Error(msg);
  }
  return data;
}

function escapeHtml(s) {
  return String(s ?? "").replace(
    /[&<>"']/g,
    (c) =>
      ({
        "&": "&amp;",
        "<": "&lt;",
        ">": "&gt;",
        '"': "&quot;",
        "'": "&#39;",
      })[c],
  );
}

function toast(message, type = "info") {
  const box = document.getElementById("toasts");
  if (!box) return;
  const node = document.createElement("div");
  node.className = `toast toast-${type}`;
  node.textContent = message;
  box.appendChild(node);
  setTimeout(() => node.remove(), 4000);
}

function fmtTime(s) {
  if (!s) return "—";
  const d = new Date(s);
  return isNaN(d) ? s : d.toLocaleString();
}

function badge(state) {
  const node = document.createElement("span");
  node.className = `badge ${state}`;
  node.textContent = state;
  return node;
}

function el(tag, attrs = {}, ...children) {
  const node = document.createElement(tag);
  // Allow el("tr", child1, child2, ...): if the 2nd argument is a node or an
  // array, treat it as the first child instead of an attributes object.
  if (attrs && (attrs.nodeType === 1 || Array.isArray(attrs))) {
    children.unshift(attrs);
    attrs = {};
  }
  for (const [k, v] of Object.entries(attrs || {})) {
    if (k === "class") node.className = v;
    else if (k === "text") node.textContent = v;
    else if (k === "html") node.innerHTML = v;
    else if (k.startsWith("on")) node.addEventListener(k.slice(2), v);
    else node.setAttribute(k, v);
  }
  for (const c of children) {
    node.append(c == null ? "" : c);
  }
  return node;
}

async function startScan(kind, params) {
  return api(`/api/scan/${kind}`, { method: "POST", body: params });
}