"use strict";

// ── Update modal ──────────────────────────────────────────────────

function openUpdateModal() {
  if (!$modal) return;
  _updateLog = "";
  _updateLogOffset = 0;
  _serverWasDown = false;
  _updateFinished = false;
  if ($modalLog) $modalLog.textContent = "";
  if ($modalStatus) $modalStatus.textContent = "Starting update…";
  if ($modalSpinner) $modalSpinner.classList.add("spinning");
  if ($btnReboot) $btnReboot.style.display = "none";
  if ($btnSave) $btnSave.style.display = "none";
  if ($btnCloseModal) $btnCloseModal.disabled = true;
  $modal.classList.add("open");
  startUpdate();
}

function closeUpdateModal() {
  if (!$modal) return;
  $modal.classList.remove("open");
  stopUpdatePoll();
}

function appendLog(text) {
  if (!text) return;
  _updateLog += text;
  if ($modalLog) { $modalLog.textContent += text; $modalLog.scrollTop = $modalLog.scrollHeight; }
}

function startUpdate() {
  fetch("/api/updates/run", { method: "POST" })
    .then(function(response) {
      if (!response.ok) return response.text().then(function(t) { throw new Error(t); });
      return response.json();
    })
    .then(function(data) {
      if (data.status === "already_running") appendLog("[Update already in progress, attaching…]\n\n");
      if ($modalStatus) $modalStatus.textContent = "Updating…";
      startUpdatePoll();
    })
    .catch(function(err) {
      appendLog("[Error: failed to start update — " + err + "]\n");
      onUpdateDone(false);
    });
}

function startUpdatePoll() {
  pollUpdateStatus();
  _updatePollTimer = setInterval(pollUpdateStatus, UPDATE_POLL_INTERVAL);
}

function stopUpdatePoll() {
  if (_updatePollTimer) { clearInterval(_updatePollTimer); _updatePollTimer = null; }
}

async function pollUpdateStatus() {
  if (_updateFinished) return;
  try {
    var data = await apiFetch("/api/updates/status?offset=" + _updateLogOffset);
    if (_serverWasDown) { _serverWasDown = false; appendLog("[Server reconnected]\n"); if ($modalStatus) $modalStatus.textContent = "Updating…"; }
    if (data.log) appendLog(data.log);
    _updateLogOffset = data.offset;
    if (data.running) return;
    _updateFinished = true;
    stopUpdatePoll();
    if (data.result === "success") onUpdateDone(true);
    else onUpdateDone(false);
  } catch (err) {
    if (!_serverWasDown) { _serverWasDown = true; appendLog("\n[Server restarting — waiting for it to come back…]\n"); if ($modalStatus) $modalStatus.textContent = "Server restarting…"; }
  }
}

function onUpdateDone(success) {
  if ($modalSpinner) $modalSpinner.classList.remove("spinning");
  if ($btnCloseModal) $btnCloseModal.disabled = false;
  if (success) {
    if ($modalStatus) $modalStatus.textContent = "✓ Update complete";
    if ($btnReboot) $btnReboot.style.display = "inline-flex";
  } else {
    if ($modalStatus) $modalStatus.textContent = "✗ Update failed";
    if ($btnSave) $btnSave.style.display = "inline-flex";
    if ($btnReboot) $btnReboot.style.display = "inline-flex";
  }
}

function saveErrorReport() {
  var blob = new Blob([_updateLog], { type: "text/plain" });
  var url = URL.createObjectURL(blob);
  var a = document.createElement("a");
  a.href = url;
  a.download = "sovran-update-error-" + new Date().toISOString().split(".")[0].replace(/:/g, "-") + ".txt";
  document.body.appendChild(a);
  a.click();
  document.body.removeChild(a);
  URL.revokeObjectURL(url);
}

// ── Reboot ────────────────────────────────────────────────────────

function doReboot() {
  if ($modal) $modal.classList.remove("open");
  if ($rebuildModal) $rebuildModal.classList.remove("open");
  stopUpdatePoll();
  stopRebuildPoll();
  if ($rebootOverlay) $rebootOverlay.classList.add("visible");
  fetch("/api/reboot", { method: "POST" }).catch(function() {});
  setTimeout(waitForServerReboot, REBOOT_CHECK_INTERVAL);
}

function waitForServerReboot() {
  fetch("/api/config", { cache: "no-store" })
    .then(function(res) {
      if (res.ok) window.location.reload();
      else setTimeout(waitForServerReboot, REBOOT_CHECK_INTERVAL);
    })
    .catch(function() { setTimeout(waitForServerReboot, REBOOT_CHECK_INTERVAL); });
}