const SNAPSHOT_REFRESH_DELAY_MS = 5000;

function formatRemaining(totalSeconds) {
  const seconds = Math.max(0, Math.ceil(totalSeconds));
  const minutes = Math.floor(seconds / 60);
  const rest = seconds % 60;
  return `${minutes}:${String(rest).padStart(2, "0")}`;
}

function updateTimers() {
  const now = Date.now() / 1000;
  document.querySelectorAll("[data-auto-off-at]").forEach((item) => {
    const target = Number(item.dataset.autoOffAt || 0);
    if (!target) {
      return;
    }
    const remaining = target - now;
    if (remaining <= 0) {
      item.textContent = item.dataset.expiredLabel || "Automatic turn-off pending";
      item.classList.add("timer-expired");
      return;
    }
    item.textContent = `${item.dataset.prefix || "Automatic turn-off in"} ${formatRemaining(remaining)}`;
  });
}

function refreshStatusElement() {
  return document.querySelector("[data-refresh-status]");
}

function showRefreshMessage(message, type = "success") {
  const status = refreshStatusElement();
  if (!status) {
    return;
  }
  status.textContent = message || "";
  status.classList.toggle("is-visible", Boolean(message));
  status.classList.toggle("is-success", type === "success");
  status.classList.toggle("is-error", type === "error");
}

function rememberRefreshMessage(message) {
  try {
    window.sessionStorage.setItem("frigateRefreshMessage", message);
  } catch (_error) {
    // Some browsers may block sessionStorage; the refresh still succeeds.
  }
}

function restoreRefreshMessage() {
  try {
    const message = window.sessionStorage.getItem("frigateRefreshMessage");
    if (!message) {
      return;
    }
    window.sessionStorage.removeItem("frigateRefreshMessage");
    showRefreshMessage(message, "success");
  } catch (_error) {
    // Ignore storage errors and keep the GUI usable.
  }
}

async function handleRefreshSubmit(form, event) {
  event.preventDefault();
  const button = form.querySelector(".refresh-button");
  if (button && button.classList.contains("is-refreshing")) {
    return;
  }
  const status = refreshStatusElement();
  const workingLabel = status?.dataset.workingLabel || "Refreshing cameras...";
  showRefreshMessage(workingLabel, "success");
  if (button) {
    button.disabled = true;
    button.classList.add("is-refreshing");
    button.setAttribute("aria-busy", "true");
  }
  try {
    const response = await fetch(form.action, {
      method: "POST",
      headers: { Accept: "application/json" },
    });
    const payload = await response.json();
    if (!response.ok || payload.ok === false) {
      throw new Error(payload.message || "Refresh failed");
    }
    showRefreshMessage(payload.message, "success");
    if (payload.changed && payload.redirect_url) {
      rememberRefreshMessage(payload.message);
      window.setTimeout(() => {
        window.location.assign(payload.redirect_url);
      }, 900);
      return;
    }
  } catch (error) {
    showRefreshMessage(error.message || "Refresh failed", "error");
  } finally {
    if (button) {
      button.disabled = false;
      button.classList.remove("is-refreshing");
      button.removeAttribute("aria-busy");
    }
  }
}

function refreshSnapshot(button) {
  if (button.classList.contains("is-refreshing")) {
    return;
  }
  const media = button.closest(".media");
  const image = media?.querySelector("img.snapshot");
  if (!image) {
    return;
  }
  const url = new URL(image.currentSrc || image.src, window.location.href);
  url.searchParams.set("refresh", "1");
  url.searchParams.set("v", String(Date.now()));
  const cleanup = () => {
    button.disabled = false;
    button.classList.remove("is-refreshing");
    button.removeAttribute("aria-busy");
  };
  button.disabled = true;
  button.classList.add("is-refreshing");
  button.setAttribute("aria-busy", "true");
  image.addEventListener("load", cleanup, { once: true });
  image.addEventListener("error", cleanup, { once: true });
  window.setTimeout(() => {
    image.src = url.toString();
  }, SNAPSHOT_REFRESH_DELAY_MS);
}

function actionContainerById(actionId) {
  for (const container of document.querySelectorAll("[data-action-id]")) {
    if (container.dataset.actionId === actionId) {
      return container;
    }
  }
  return null;
}

function actionStatusForForm(form) {
  return form.closest(".action-control, .global-action")?.querySelector("[data-action-status]");
}

function showActionMessage(form, message, type = "success") {
  const status = actionStatusForForm(form);
  if (!status) {
    return;
  }
  status.textContent = message || "";
  status.classList.toggle("is-visible", Boolean(message));
  status.classList.toggle("is-success", type === "success");
  status.classList.toggle("is-error", type === "error");
}

function setCommandBusy(button, busy) {
  if (!button) {
    return;
  }
  if (busy) {
    button.disabled = true;
    button.classList.add("is-working");
    button.setAttribute("aria-busy", "true");
    return;
  }
  if (button.dataset.timerLocked !== "true") {
    button.disabled = false;
  }
  button.classList.remove("is-working");
  button.removeAttribute("aria-busy");
}

function updateStateChip(container, action) {
  const chip = container.querySelector("[data-state-chip]");
  if (!chip || !action.state) {
    return;
  }
  const state = String(action.state).toLowerCase();
  for (const className of Array.from(chip.classList)) {
    if (className.startsWith("chip-state-")) {
      chip.classList.remove(className);
    }
  }
  chip.classList.add(`chip-state-${state}`);
  chip.textContent = action.state_label || chip.dataset[`label${state.charAt(0).toUpperCase()}${state.slice(1)}`] || action.state;
}

function updateTimer(container, action) {
  const timer = container.querySelector("[data-timer]");
  if (!timer) {
    return;
  }
  if (action.auto_off_at) {
    timer.dataset.autoOffAt = String(action.auto_off_at);
    timer.classList.remove("timer-idle", "timer-expired");
    updateTimers();
    return;
  }
  delete timer.dataset.autoOffAt;
  timer.classList.add("timer-idle");
  timer.classList.remove("timer-expired");
  timer.textContent = timer.dataset.idleLabel || "";
}

function updateOnButtonLock(container, action) {
  const button = container.querySelector(".cmd-on");
  if (!button) {
    return;
  }
  if (action.auto_off_at) {
    const label = button.dataset.disabledLabel || "Already active until automatic turn-off";
    button.dataset.timerLocked = "true";
    button.disabled = true;
    button.title = label;
    button.setAttribute("aria-label", label);
    return;
  }
  delete button.dataset.timerLocked;
  if (!button.classList.contains("is-working")) {
    button.disabled = false;
  }
  button.removeAttribute("title");
  button.removeAttribute("aria-label");
}

function applyActionState(action) {
  if (!action?.id) {
    return;
  }
  const container = actionContainerById(action.id);
  if (!container) {
    return;
  }
  updateStateChip(container, action);
  updateTimer(container, action);
  updateOnButtonLock(container, action);
}

function applyActionPayload(payload) {
  if (Array.isArray(payload.actions)) {
    payload.actions.forEach(applyActionState);
    return;
  }
  applyActionState(payload.action);
}

function refreshSnapshotForCommand(form) {
  const button = form.closest(".camera-card")?.querySelector(".snapshot-refresh");
  if (!button || button.classList.contains("is-refreshing")) {
    return;
  }
  refreshSnapshot(button);
}

async function responseJson(response) {
  const text = await response.text();
  if (!text) {
    return {};
  }
  try {
    return JSON.parse(text);
  } catch (_error) {
    return { ok: false, message: text };
  }
}

async function handleCommandSubmit(form, event) {
  event.preventDefault();
  if (form.dataset.requiresAck === "true") {
    const message = form.dataset.ackMessage || "Confirm this action";
    if (!window.confirm(message)) {
      return;
    }
  }
  const button = form.querySelector(".cmd");
  if (button?.classList.contains("is-working")) {
    return;
  }
  showActionMessage(form, form.dataset.workingLabel || "Sending command...", "success");
  setCommandBusy(button, true);
  try {
    const response = await fetch(form.action, {
      method: "POST",
      headers: { Accept: "application/json" },
    });
    const payload = await responseJson(response);
    if (!response.ok || payload.ok === false) {
      throw new Error(payload.message || form.dataset.failedLabel || "Command failed.");
    }
    applyActionPayload(payload);
    showActionMessage(form, payload.message || form.dataset.successLabel || "Command sent.", "success");
    refreshSnapshotForCommand(form);
  } catch (error) {
    showActionMessage(form, error.message || form.dataset.failedLabel || "Command failed.", "error");
  } finally {
    setCommandBusy(button, false);
  }
}

document.addEventListener("click", (event) => {
  const button = event.target.closest(".snapshot-refresh");
  if (!(button instanceof HTMLButtonElement)) {
    return;
  }
  refreshSnapshot(button);
});

document.addEventListener("submit", (event) => {
  const form = event.target;
  if (!(form instanceof HTMLFormElement)) {
    return;
  }
  if (form.classList.contains("refresh-form")) {
    handleRefreshSubmit(form, event);
    return;
  }
  if (form.classList.contains("command-form")) {
    handleCommandSubmit(form, event);
    return;
  }
});

updateTimers();
restoreRefreshMessage();
setInterval(updateTimers, 1000);