import { DEFAULT_SETTINGS } from "../lib/defaults.js";
import { load, save } from "../lib/settings.js";

const SAVE_DEBOUNCE_MS = 400;
const STATUS_CLEAR_MS = 1500;

const field = (id) => document.getElementById(id);

let saveTimer = null;
let statusTimer = null;
// Suppresses the change/input handlers while we are programmatically writing
// values into the form, so a remote sync cannot trigger a save loop.
let applying = false;

function render(settings) {
  applying = true;
  field("model").value = settings.model;
  field("temporaryChat").checked = settings.temporaryChat;
  field("webSearch").checked = settings.webSearch;
  field("openIn").value = settings.openIn;
  field("promptTemplate").value = settings.promptTemplate;
  applying = false;
}

function collect() {
  return {
    model: field("model").value,
    temporaryChat: field("temporaryChat").checked,
    webSearch: field("webSearch").checked,
    openIn: field("openIn").value,
    promptTemplate: field("promptTemplate").value,
  };
}

function showStatus(message) {
  field("status").textContent = message;
  clearTimeout(statusTimer);
  statusTimer = setTimeout(() => {
    field("status").textContent = "";
  }, STATUS_CLEAR_MS);
}

async function persist(settings) {
  try {
    await save(settings);
    showStatus("Saved");
  } catch {
    // storage.sync sanitises its errors, so there is nothing specific to report.
    showStatus("Could not save settings");
  }
}

// Debounced so typing in a text field cannot approach any write-rate quota.
function scheduleSave() {
  if (applying) {
    return;
  }
  clearTimeout(saveTimer);
  saveTimer = setTimeout(() => persist(collect()), SAVE_DEBOUNCE_MS);
}

// Module scripts are deferred, so the DOM is already parsed here.
render(await load());

for (const id of Object.keys(DEFAULT_SETTINGS)) {
  field(id).addEventListener("input", scheduleSave);
  field(id).addEventListener("change", scheduleSave);
}

field("restore").addEventListener("click", () => {
  clearTimeout(saveTimer);
  render(DEFAULT_SETTINGS);
  persist({ ...DEFAULT_SETTINGS });
});

// A remote sync landing while the panel is open must update the controls rather
// than being clobbered by stale field values on the next edit.
browser.storage.onChanged.addListener(async (changes, area) => {
  if (area !== "sync") {
    return;
  }
  render(await load());
});