const APPS = [
  { name: "Netflix", package: "com.netflix.ninja" },
  { name: "YouTube", package: "com.google.android.youtube.tv" },
  { name: "Prime Video", package: "com.amazon.amazonvideo.livingroom" },
  { name: "Disney+", package: "com.disney.disneyplus" },
  { name: "Spotify", package: "com.spotify.tv.android" },
  { name: "Plex", package: "com.plexapp.android" },
];

const state = {
  devices: [],
  selectedId: localStorage.getItem("selectedDeviceId") || null,
};

const els = {
  deviceSelect: document.getElementById("deviceSelect"),
  statusDot: document.getElementById("statusDot"),
  settingsBtn: document.getElementById("settingsBtn"),
  settingsDialog: document.getElementById("settingsDialog"),
  closeSettings: document.getElementById("closeSettings"),
  deviceList: document.getElementById("deviceList"),
  addDeviceForm: document.getElementById("addDeviceForm"),
  newDeviceName: document.getElementById("newDeviceName"),
  newDeviceHost: document.getElementById("newDeviceHost"),
  pairForm: document.getElementById("pairForm"),
  pairHost: document.getElementById("pairHost"),
  pairCode: document.getElementById("pairCode"),
  settingsMessage: document.getElementById("settingsMessage"),
  searchForm: document.getElementById("searchForm"),
  searchInput: document.getElementById("searchInput"),
  appsRow: document.getElementById("appsRow"),
  toast: document.getElementById("toast"),
};

function setSettingsMessage(text, isError = false) {
  els.settingsMessage.textContent = text;
  els.settingsMessage.classList.toggle("error", isError);
}

function showToast(message) {
  els.toast.textContent = message;
  els.toast.classList.add("show");
  clearTimeout(showToast._t);
  showToast._t = setTimeout(() => els.toast.classList.remove("show"), 1800);
}

function vibrate() {
  if (navigator.vibrate) navigator.vibrate(12);
}

async function api(path, options) {
  const res = await fetch(`/api${path}`, {
    headers: { "Content-Type": "application/json" },
    ...options,
  });
  const body = await res.json().catch(() => ({}));
  if (!res.ok) {
    throw new Error(body.error || `Request failed (${res.status})`);
  }
  return body;
}

function currentDevice() {
  return state.devices.find((d) => d.id === state.selectedId) || null;
}

function renderDeviceSelect() {
  els.deviceSelect.innerHTML = "";
  if (!state.devices.length) {
    const opt = document.createElement("option");
    opt.textContent = "No TVs added — tap ⚙";
    els.deviceSelect.appendChild(opt);
    els.statusDot.className = "status-dot";
    return;
  }
  for (const d of state.devices) {
    const opt = document.createElement("option");
    opt.value = d.id;
    opt.textContent = d.name;
    els.deviceSelect.appendChild(opt);
  }
  if (!state.selectedId || !state.devices.some((d) => d.id === state.selectedId)) {
    state.selectedId = state.devices[0].id;
  }
  els.deviceSelect.value = state.selectedId;
  localStorage.setItem("selectedDeviceId", state.selectedId);
  updateStatusDot();
}

function updateStatusDot() {
  const device = currentDevice();
  els.statusDot.className = "status-dot";
  if (device?.status === "device") els.statusDot.classList.add("online");
  else if (device) els.statusDot.classList.add("offline");
}

function renderDeviceList() {
  els.deviceList.innerHTML = "";
  for (const d of state.devices) {
    const li = document.createElement("li");
    li.innerHTML = `
      <div>
        <div class="device-name">${escapeHtml(d.name)}</div>
        <div class="device-host">${escapeHtml(d.host)} · ${d.status || "unknown"}</div>
      </div>
      <div class="device-actions">
        <button data-action="connect" data-id="${d.id}">Connect</button>
        <button class="danger" data-action="remove" data-id="${d.id}">Remove</button>
      </div>
    `;
    els.deviceList.appendChild(li);
  }
}

function escapeHtml(str) {
  return String(str).replace(/[&<>"']/g, (c) => ({ "&": "&amp;", "<": "&lt;", ">": "&gt;", '"': "&quot;", "'": "&#39;" }[c]));
}

async function refreshDevices() {
  const { devices } = await api("/devices");
  state.devices = devices;
  renderDeviceSelect();
  renderDeviceList();
}

async function sendKey(key) {
  const device = currentDevice();
  if (!device) return showToast("Add a TV first (⚙)");
  vibrate();
  try {
    await api(`/devices/${device.id}/key`, { method: "POST", body: JSON.stringify({ key }) });
  } catch (err) {
    showToast(err.message);
  }
}

async function launchApp(packageName, label) {
  const device = currentDevice();
  if (!device) return showToast("Add a TV first (⚙)");
  vibrate();
  try {
    await api(`/devices/${device.id}/app`, { method: "POST", body: JSON.stringify({ package: packageName }) });
    showToast(`Opening ${label}…`);
  } catch (err) {
    showToast(err.message);
  }
}

function renderApps() {
  els.appsRow.innerHTML = "";
  for (const app of APPS) {
    const btn = document.createElement("button");
    btn.className = "btn";
    btn.textContent = app.name;
    btn.addEventListener("click", () => launchApp(app.package, app.name));
    els.appsRow.appendChild(btn);
  }
}

document.querySelectorAll("[data-key]").forEach((btn) => {
  btn.addEventListener("click", () => sendKey(btn.dataset.key));
});

document.querySelector('[data-action="mute"]').addEventListener("click", () => sendKey("VOLUME_MUTE"));

els.deviceSelect.addEventListener("change", () => {
  state.selectedId = els.deviceSelect.value;
  localStorage.setItem("selectedDeviceId", state.selectedId);
  updateStatusDot();
});

els.settingsBtn.addEventListener("click", async () => {
  setSettingsMessage("");
  await refreshDevices().catch((err) => showToast(err.message));
  els.settingsDialog.showModal();
});

els.closeSettings.addEventListener("click", () => els.settingsDialog.close());

els.addDeviceForm.addEventListener("submit", async (e) => {
  e.preventDefault();
  setSettingsMessage("");
  try {
    const { device } = await api("/devices", {
      method: "POST",
      body: JSON.stringify({ name: els.newDeviceName.value.trim(), host: els.newDeviceHost.value.trim() }),
    });
    els.newDeviceName.value = "";
    els.newDeviceHost.value = "";
    state.selectedId = device.id;
    await refreshDevices();
    setSettingsMessage(`Added ${device.name}. Connecting…`);
    await api(`/devices/${device.id}/connect`, { method: "POST" });
    setSettingsMessage(`Connected to ${device.name}.`);
    await refreshDevices();
  } catch (err) {
    setSettingsMessage(err.message, true);
    await refreshDevices();
  }
});

els.deviceList.addEventListener("click", async (e) => {
  const target = e.target.closest("button");
  if (!target) return;
  const { action, id } = target.dataset;
  setSettingsMessage("");
  try {
    if (action === "connect") {
      setSettingsMessage("Connecting…");
      await api(`/devices/${id}/connect`, { method: "POST" });
      setSettingsMessage("Connected.");
    } else if (action === "remove") {
      await api(`/devices/${id}`, { method: "DELETE" });
    }
    await refreshDevices();
  } catch (err) {
    setSettingsMessage(err.message, true);
    await refreshDevices();
  }
});

els.pairForm.addEventListener("submit", async (e) => {
  e.preventDefault();
  setSettingsMessage("Pairing…");
  try {
    const device = currentDevice();
    if (!device) throw new Error("Add the TV's IP first, then pair.");
    await api(`/devices/${device.id}/pair`, {
      method: "POST",
      body: JSON.stringify({ pairHost: els.pairHost.value.trim(), code: els.pairCode.value.trim() }),
    });
    setSettingsMessage("Paired! Reconnecting…");
    els.pairHost.value = "";
    els.pairCode.value = "";
    await refreshDevices();
  } catch (err) {
    setSettingsMessage(err.message, true);
  }
});

els.searchForm.addEventListener("submit", async (e) => {
  e.preventDefault();
  const device = currentDevice();
  const text = els.searchInput.value.trim();
  if (!device || !text) return;
  try {
    await api(`/devices/${device.id}/text`, { method: "POST", body: JSON.stringify({ text }) });
    els.searchInput.value = "";
    showToast("Sent");
  } catch (err) {
    showToast(err.message);
  }
});

renderApps();
refreshDevices().catch((err) => showToast(err.message));
setInterval(() => refreshDevices().catch(() => {}), 8000);

if ("serviceWorker" in navigator) {
  window.addEventListener("load", () => {
    navigator.serviceWorker.register("/sw.js").catch(() => {});
  });
}