const state = {
  activeColor: null,
  alertActive: false,
  demoActive: false,
  busy: false,
};

const lamps = [...document.querySelectorAll(".lamp")];
const alertToggle = document.getElementById("alertToggle");
const demoToggle = document.getElementById("demoToggle");
const allOffButton = document.getElementById("allOffButton");
const activeColorText = document.getElementById("activeColorText");
const alertToggleLabel = document.getElementById("alertToggleLabel");
const demoToggleLabel = document.getElementById("demoToggleLabel");
const connectionBadge = document.getElementById("connectionBadge");
const message = document.getElementById("message");

function setMessage(text, isError = false) {
  message.textContent = text;
  message.classList.toggle("is-error", isError);
}

function setConnection(online) {
  connectionBadge.textContent = online ? "API online" : "API offline";
  connectionBadge.className = `badge ${online ? "badge--online" : "badge--offline"}`;
}

function render() {
  lamps.forEach((lamp) => {
    const active = !state.demoActive && lamp.dataset.color === state.activeColor;
    lamp.classList.toggle("is-active", active);
    lamp.setAttribute("aria-pressed", String(active));
    lamp.disabled = state.busy;
  });

  activeColorText.textContent = state.demoActive
    ? "Demo running"
    : (state.activeColor || "Off");

  alertToggle.setAttribute("aria-checked", String(state.alertActive));
  alertToggleLabel.textContent = state.alertActive ? "On" : "Off";
  alertToggle.disabled = state.busy;

  demoToggle.setAttribute("aria-checked", String(state.demoActive));
  demoToggleLabel.textContent = state.demoActive ? "On" : "Off";
  demoToggle.disabled = state.busy;

  allOffButton.disabled = state.busy;
}

function applyApiState(payload) {
  if (Object.hasOwn(payload, "active_color")) state.activeColor = payload.active_color;
  if (Object.hasOwn(payload, "alert_active")) state.alertActive = Boolean(payload.alert_active);
  if (Object.hasOwn(payload, "demo_active")) state.demoActive = Boolean(payload.demo_active);
}

async function apiCall(path, options = {}) {
  const result = await fetch(path, {
    method: options.method || "GET",
    headers: { "Accept": "application/json" },
  });
  const payload = await result.json().catch(() => ({}));
  if (!result.ok) {
    throw new Error(payload.error || payload.detail || `Request failed (${result.status})`);
  }
  return payload;
}

async function runAction(action, successMessage) {
  if (state.busy) return;
  state.busy = true;
  render();
  setMessage("Sending command…");

  try {
    const payload = await action();
    applyApiState(payload);
    setConnection(true);
    setMessage(successMessage);
  } catch (error) {
    setConnection(false);
    setMessage(error.message, true);
  } finally {
    state.busy = false;
    render();
  }
}

lamps.forEach((lamp) => {
  lamp.addEventListener("click", () => {
    const color = lamp.dataset.color;
    runAction(
      () => apiCall(`/ui-api/color/${color}`, { method: "POST" }),
      `${color[0].toUpperCase()}${color.slice(1)} light activated.`,
    );
  });
});

alertToggle.addEventListener("click", () => {
  const nextState = state.alertActive ? "off" : "on";
  runAction(
    () => apiCall(`/ui-api/alert/${nextState}`, { method: "POST" }),
    `Alert turned ${nextState}.`,
  );
});

demoToggle.addEventListener("click", () => {
  const nextState = state.demoActive ? "off" : "on";
  runAction(
    () => apiCall(`/ui-api/demo/${nextState}`, { method: "POST" }),
    `Demo mode turned ${nextState}.`,
  );
});

allOffButton.addEventListener("click", () => {
  runAction(
    () => apiCall("/ui-api/off", { method: "POST" }),
    "All outputs turned off.",
  );
});

async function refreshStatus({ quiet = false } = {}) {
  if (state.busy) return;
  try {
    const payload = await apiCall("/ui-api/status");
    applyApiState(payload);
    setConnection(true);
    if (!quiet) setMessage("Status synchronized.");
    render();
  } catch (error) {
    setConnection(false);
    if (!quiet) setMessage(error.message, true);
  }
}

refreshStatus();
setInterval(() => refreshStatus({ quiet: true }), 1500);