function getCookie(name) {
  const match = document.cookie.match(new RegExp("(?:^|; )" + name + "=([^;]*)"));
  return match ? decodeURIComponent(match[1]) : "";
}

async function apiFetch(url, options) {
  options = options || {};
  options.headers = options.headers || {};
  if (options.method && options.method !== "GET") {
    options.headers["X-CSRF-Token"] = getCookie("wgm_csrf");
  }
  const res = await fetch(url, options);
  if (res.status === 401) {
    window.location.href = "/login";
    throw new Error("unauthenticated");
  }
  return res;
}

async function loadServers() {
  const tbody = document.querySelector("#servers tbody");
  tbody.innerHTML = "";
  const res = await apiFetch("/api/servers");
  if (!res.ok) return;
  const servers = await res.json();

  for (const s of servers) {
    const tr = document.createElement("tr");

    const nameTd = document.createElement("td");
    const link = document.createElement("a");
    link.href = "/servers/" + s.ID;
    link.textContent = s.Name;
    nameTd.appendChild(link);

    const ifaceTd = document.createElement("td");
    ifaceTd.textContent = s.InterfaceName;

    const portTd = document.createElement("td");
    portTd.textContent = s.ListenPort;

    const statusTd = document.createElement("td");
    const badge = document.createElement("span");
    badge.className = "badge " + (s.status === "UP" ? "up" : "down");
    badge.textContent = s.status;
    statusTd.appendChild(badge);

    const actionsTd = document.createElement("td");
    actionsTd.appendChild(makeActionButton("Start", () => serverAction(s.ID, "start")));
    actionsTd.appendChild(makeActionButton("Stop", () => serverAction(s.ID, "stop")));
    actionsTd.appendChild(makeActionButton("Reload", () => serverAction(s.ID, "reload")));

    tr.appendChild(nameTd);
    tr.appendChild(ifaceTd);
    tr.appendChild(portTd);
    tr.appendChild(statusTd);
    tr.appendChild(actionsTd);
    tbody.appendChild(tr);
  }
}

function makeActionButton(label, onClick) {
  const btn = document.createElement("button");
  btn.textContent = label;
  btn.className = "secondary";
  btn.addEventListener("click", onClick);
  return btn;
}

async function serverAction(id, action) {
  await apiFetch("/api/servers/" + id + "/" + action, { method: "POST" });
  loadServers();
}

document.getElementById("new-server").addEventListener("click", async () => {
  const name = prompt("Name des Servers (z.B. WGhome):");
  if (!name) return;
  const interfaceName = prompt("Interface (z.B. wg-home):");
  if (!interfaceName) return;
  const listenPort = parseInt(prompt("Listen Port (z.B. 51822):"), 10);
  if (!listenPort) return;
  const addressRange = prompt("Address Range (z.B. 10.20.22.0/24):");
  if (!addressRange) return;
  const dns = prompt("DNS (optional):") || "";

  const res = await apiFetch("/api/servers", {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({
      name: name,
      interface_name: interfaceName,
      listen_port: listenPort,
      address_range: addressRange,
      dns: dns,
      mtu: 1420,
    }),
  });
  if (!res.ok) {
    const data = await res.json().catch(() => ({}));
    alert(data.error || "Server konnte nicht erstellt werden.");
    return;
  }
  loadServers();
});

loadServers();