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);
}

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.dataset.requiresAck !== "true") {
    return;
  }
  const message = form.dataset.ackMessage || "Confirm this action";
  if (!window.confirm(message)) {
    event.preventDefault();
  }
});

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