/*
 * FOSFENO :: Panel de control
 * Conecta con el servidor, refleja el estado y envia ordenes.
 * Incluye editor de codigo, mezclador VJ, ventana de ayuda y avisos.
 */

const socket = io();
let state = null;
let editorEngine = "";          // que motor tiene cargado el editor
let helpData = {};              // textos de ayuda
let lastNotifT = 0;             // marca de tiempo del ultimo aviso mostrado

const $ = (s) => document.querySelector(s);
const $$ = (s) => document.querySelectorAll(s);

// Sliders del mezclador VJ (se generan dinamicamente)
const MIXER_SLIDERS = [
  { key: "mix",        label: "Mezcla A/B",    min: 0,    max: 1,    step: 0.01 },
  { key: "hue",        label: "Tono (hue)",    min: 0,    max: 1,    step: 0.01 },
  { key: "saturate",   label: "Saturacion",    min: 0,    max: 3,    step: 0.05 },
  { key: "contrast",   label: "Contraste",     min: 0,    max: 3,    step: 0.05 },
  { key: "brightness", label: "Brillo",        min: -0.5, max: 0.5,  step: 0.02 },
  { key: "colorama",   label: "Colorama",      min: 0,    max: 1,    step: 0.01 },
  { key: "posterize",  label: "Posterizar",    min: 0,    max: 8,    step: 1 },
  { key: "pixelate",   label: "Pixelado",      min: 0,    max: 1,    step: 0.02 },
  { key: "kaleid",     label: "Caleidoscopio", min: 0,    max: 12,   step: 1 },
  { key: "rotate",     label: "Rotacion",      min: -3,   max: 3,    step: 0.05 },
  { key: "feedback",   label: "Feedback",      min: 0,    max: 0.95, step: 0.01 },
];

// ==========================================================================
// Editor de codigo (CodeMirror)
// ==========================================================================
let editor = null;
if (typeof CodeMirror !== "undefined") {
  editor = CodeMirror.fromTextArea($("#code"), {
    lineNumbers: true, theme: "material-darker",
    mode: "javascript", lineWrapping: true,
  });
}

// ==========================================================================
// Librerias de codigo y de ayuda
// ==========================================================================
let hydraLib = [];
let shaderLib = [];

async function loadData() {
  try {
    const sketches = await fetch("/data/hydra-sketches.json").then((r) => r.json());
    const snippets = await fetch("/data/hydra-snippets.json").then((r) => r.json());
    const shaders = await fetch("/data/shaders.json").then((r) => r.json());
    hydraLib = [];
    for (const [id, v] of Object.entries(sketches)) {
      hydraLib.push({ id: "s:" + id, name: "* " + (v.name || id), code: v.code });
    }
    for (const [id, v] of Object.entries(snippets.snippets || {})) {
      hydraLib.push({ id: "x:" + id, name: v.name || id, code: v.code });
    }
    shaderLib = Object.entries(shaders).map(
      ([id, v]) => ({ id: id, name: v.name || id, code: v.code }));
  } catch (err) {
    console.error("[FOSFENO] No se pudieron cargar las librerias:", err);
  }
  try {
    const ayuda = await fetch("/data/ayuda.json").then((r) => r.json());
    helpData = ayuda.ayuda || {};
  } catch (err) {
    console.error("[FOSFENO] No se pudo cargar la ayuda:", err);
  }
  // Si el estado llego antes que las librerias, repinta para que aparezcan
  if (state) { editorEngine = ""; render(); }
}

function fillLibrarySelect(lib) {
  const sel = $("#lib-select");
  sel.innerHTML = '<option value="">-- Cargar de la libreria --</option>';
  lib.forEach((it, i) => {
    const opt = document.createElement("option");
    opt.value = String(i);
    opt.textContent = it.name;
    sel.appendChild(opt);
  });
}

// ==========================================================================
// Ventana de informacion
// ==========================================================================
function openHelp(key) {
  const h = helpData[key];
  if (!h) return;
  $("#modal-title").textContent = h.title || "Informacion";
  const body = $("#modal-body");
  body.innerHTML = "";
  (h.body || []).forEach((par) => {
    const p = document.createElement("p");
    p.textContent = par;
    body.appendChild(p);
  });
  $("#modal").hidden = false;
}

function closeHelp() { $("#modal").hidden = true; }

// ==========================================================================
// Avisos (banda superior)
// ==========================================================================
let notifTimer = null;
function showNotif(entry) {
  if (!entry || !entry.message) return;
  const n = $("#notif");
  n.className = "notif " + (entry.level || "info");
  $("#notif-msg").textContent = entry.message;
  n.hidden = false;
  clearTimeout(notifTimer);
  if (entry.level === "info") {
    notifTimer = setTimeout(() => { n.hidden = true; }, 6000);
  }
  if (entry.t) lastNotifT = entry.t;
}

// ==========================================================================
// Sliders del mezclador
// ==========================================================================
function fmt(v, step) {
  return step >= 1 ? String(Math.round(v)) : Number(v).toFixed(2);
}

function buildMixerSliders() {
  const cont = $("#mixer-sliders");
  MIXER_SLIDERS.forEach((cfg) => {
    const wrap = document.createElement("div");
    wrap.className = "slider";
    wrap.innerHTML =
      `<div class="head"><span>${cfg.label}</span>` +
      `<b id="mv-${cfg.key}">-</b></div>`;
    const input = document.createElement("input");
    input.type = "range";
    input.min = cfg.min; input.max = cfg.max; input.step = cfg.step;
    input.id = "ms-" + cfg.key;
    input.addEventListener("input", () => {
      $("#mv-" + cfg.key).textContent = fmt(input.value, cfg.step);
    });
    input.addEventListener("change", () => {
      const patch = {};
      patch[cfg.key] = parseFloat(input.value);
      socket.emit("update_settings", { engine: "mixer", patch: patch });
    });
    wrap.appendChild(input);
    cont.appendChild(wrap);
  });
}

// ==========================================================================
// Render
// ==========================================================================
function render() {
  if (!state) return;
  $("#conn").className = "dot on";

  const power = $("#power");
  power.textContent = state.power ? "ON" : "OFF";
  power.classList.toggle("off", !state.power);

  $$(".engine").forEach((b) =>
    b.classList.toggle("active", b.dataset.engine === state.engine));

  fillSelectOnce($("#audio-device"), state.meta.audioDevices,
    (d) => d.id, (d) => d.name);
  if (state.audio.device) $("#audio-device").value = state.audio.device;
  $("#bpm").textContent = state.audio.bpm > 0 ? state.audio.bpm : "--";

  $("#sens").value = state.sensitivity;
  $("#sens-val").textContent = Number(state.sensitivity).toFixed(1);

  $("#ctl-butterchurn").hidden = state.engine !== "butterchurn";
  $("#ctl-editor").hidden = !(state.engine === "hydra" || state.engine === "shaders");
  $("#ctl-mixer").hidden = state.engine !== "mixer";
  $("#ctl-projectm").hidden = state.engine !== "projectm";

  renderButterchurn();
  renderEditor();
  renderMixer();

  $("#now").textContent = state.status.label || "-";

  const net = state.network || {};
  const port = (net.port && net.port !== 80) ? ":" + net.port : "";
  $("#net-foot").textContent = "Panel:  http://" +
    (net.hostname || "fosfeno") + ".local" + port + "/" +
    (net.ip ? "    (" + net.ip + ")" : "");

  // Aviso pendiente recibido antes de abrir el panel
  const notes = state.notifications || [];
  if (notes.length) {
    const last = notes[notes.length - 1];
    if (last.t !== lastNotifT) showNotif(last);
  }
}

function fillSelectOnce(sel, items, valFn, txtFn) {
  items = items || [];
  if (sel.dataset.count == items.length) return;
  sel.dataset.count = items.length;
  let keep = "";
  if (sel.id === "mix-video") {
    keep = '<option value="">-- sin video --</option>';
  } else if (sel.id === "mix-camera" && items.length === 0) {
    keep = '<option value="0">Camara por defecto</option>';
  }
  sel.innerHTML = keep;
  items.forEach((it) => {
    const opt = document.createElement("option");
    opt.value = valFn(it);
    opt.textContent = txtFn(it);
    sel.appendChild(opt);
  });
}

function renderButterchurn() {
  if (state.engine !== "butterchurn") return;
  const b = state.butterchurn;
  fillSelectOnce($("#bc-preset"), state.meta.butterchurnPresets,
    (n) => n, (n) => n);
  if (b.preset) $("#bc-preset").value = b.preset;
  $("#bc-shuffle").checked = b.shuffle;
  $("#bc-mode-seconds").classList.toggle("active", b.intervalMode === "seconds");
  $("#bc-mode-beats").classList.toggle("active", b.intervalMode === "beats");
  $("#bc-interval").value = b.interval;
  $("#bc-int-val").textContent = b.interval;
  $("#bc-int-unit").textContent = b.intervalMode === "beats" ? "comp." : "s";
  $("#bc-blend").value = b.blendTime;
  $("#bc-blend-val").textContent = Number(b.blendTime).toFixed(1);
}

function renderEditor() {
  if (state.engine !== "hydra" && state.engine !== "shaders") return;
  $("#editor-info").dataset.help = state.engine;
  if (state.engine !== editorEngine) {
    editorEngine = state.engine;
    const isHydra = state.engine === "hydra";
    $("#editor-title").textContent = isHydra
      ? "Editor Hydra (JavaScript)" : "Editor de shaders (GLSL)";
    $("#editor-hint").textContent = isHydra
      ? "Variables: time, a.fft[0..4], bpm. Escribe o pega codigo Hydra."
      : "Uniforms: u_time, u_bass, u_mid, u_treble, u_bpm, u_beat, u_fft.";
    fillLibrarySelect(isHydra ? hydraLib : shaderLib);
    if (editor) {
      editor.setOption("mode", isHydra ? "javascript" : "text/x-csrc");
      editor.setValue(state[state.engine].code || "");
      setTimeout(() => editor.refresh(), 30);
    }
  }
}

function renderMixer() {
  if (state.engine !== "mixer") return;
  const m = state.mixer;
  $$("#mixer-source .segbtn").forEach((b) =>
    b.classList.toggle("active", b.dataset.src === m.source));
  $("#mix-cam").checked = m.camOn;
  fillSelectOnce($("#mix-camera"), state.meta.cameraDevices,
    (d) => d.id, (d) => d.name);
  $("#mix-camera").value = m.cameraId;
  fillSelectOnce($("#mix-video"), (state.meta.videos || []).map((v) => ({ v })),
    (o) => o.v, (o) => o.v);
  $("#mix-video").value = m.video || "";
  $("#mix-blend").value = m.blendMode;
  $("#mix-invert").checked = m.invert;
  $("#mix-beat").checked = m.beatPulse;
  MIXER_SLIDERS.forEach((cfg) => {
    const input = $("#ms-" + cfg.key);
    if (input && document.activeElement !== input) {
      input.value = m[cfg.key];
      $("#mv-" + cfg.key).textContent = fmt(m[cfg.key], cfg.step);
    }
  });
}

// ==========================================================================
// Eventos de la interfaz
// ==========================================================================
$("#power").addEventListener("click", () =>
  socket.emit("set_power", { on: !state.power }));

$$(".engine").forEach((b) =>
  b.addEventListener("click", () =>
    socket.emit("set_engine", { engine: b.dataset.engine })));

$$(".info").forEach((b) =>
  b.addEventListener("click", () => openHelp(b.dataset.help)));
$("#modal-close").addEventListener("click", closeHelp);
$("#modal").addEventListener("click", (e) => {
  if (e.target.id === "modal") closeHelp();
});

$("#notif-close").addEventListener("click", () => { $("#notif").hidden = true; });

$("#audio-device").addEventListener("change", (e) =>
  socket.emit("update_settings",
    { engine: "audio", patch: { device: e.target.value } }));

$("#sens").addEventListener("input", (e) =>
  $("#sens-val").textContent = Number(e.target.value).toFixed(1));
$("#sens").addEventListener("change", (e) =>
  socket.emit("set_sensitivity", { value: parseFloat(e.target.value) }));

// --- Butterchurn ---
$("#bc-preset").addEventListener("change", (e) =>
  socket.emit("update_settings",
    { engine: "butterchurn", patch: { preset: e.target.value } }));
$("#bc-shuffle").addEventListener("change", (e) =>
  socket.emit("update_settings",
    { engine: "butterchurn", patch: { shuffle: e.target.checked } }));
$("#bc-mode-seconds").addEventListener("click", () =>
  socket.emit("update_settings",
    { engine: "butterchurn", patch: { intervalMode: "seconds" } }));
$("#bc-mode-beats").addEventListener("click", () =>
  socket.emit("update_settings",
    { engine: "butterchurn", patch: { intervalMode: "beats" } }));
$("#bc-interval").addEventListener("input", (e) =>
  $("#bc-int-val").textContent = e.target.value);
$("#bc-interval").addEventListener("change", (e) =>
  socket.emit("update_settings",
    { engine: "butterchurn", patch: { interval: parseInt(e.target.value, 10) } }));
$("#bc-blend").addEventListener("input", (e) =>
  $("#bc-blend-val").textContent = Number(e.target.value).toFixed(1));
$("#bc-blend").addEventListener("change", (e) =>
  socket.emit("update_settings",
    { engine: "butterchurn", patch: { blendTime: parseFloat(e.target.value) } }));

// --- Editor de codigo ---
$("#run-code").addEventListener("click", () => {
  if (!editor || !editorEngine) return;
  socket.emit("run_code",
    { engine: editorEngine, code: editor.getValue(), label: "codigo personalizado" });
});
$("#clear-code").addEventListener("click", () => editor && editor.setValue(""));
$("#lib-select").addEventListener("change", (e) => {
  const lib = editorEngine === "hydra" ? hydraLib : shaderLib;
  const item = lib[parseInt(e.target.value, 10)];
  if (!item || !editor) return;
  editor.setValue(item.code);
  socket.emit("run_code",
    { engine: editorEngine, code: item.code, label: item.name });
});

// --- Mezclador ---
$$("#mixer-source .segbtn").forEach((b) =>
  b.addEventListener("click", () =>
    socket.emit("update_settings",
      { engine: "mixer", patch: { source: b.dataset.src } })));
$("#mix-cam").addEventListener("change", (e) =>
  socket.emit("update_settings",
    { engine: "mixer", patch: { camOn: e.target.checked } }));
$("#mix-camera").addEventListener("change", (e) =>
  socket.emit("update_settings",
    { engine: "mixer", patch: { cameraId: parseInt(e.target.value, 10) } }));
$("#dev-rescan").addEventListener("click", () =>
  socket.emit("rescan_devices"));
$("#mix-video").addEventListener("change", (e) =>
  socket.emit("update_settings",
    { engine: "mixer", patch: { video: e.target.value } }));
$("#mix-blend").addEventListener("change", (e) =>
  socket.emit("update_settings",
    { engine: "mixer", patch: { blendMode: e.target.value } }));
$("#mix-rescan").addEventListener("click", () => socket.emit("rescan_videos"));
$("#mix-invert").addEventListener("change", (e) =>
  socket.emit("update_settings",
    { engine: "mixer", patch: { invert: e.target.checked } }));
$("#mix-beat").addEventListener("change", (e) =>
  socket.emit("update_settings",
    { engine: "mixer", patch: { beatPulse: e.target.checked } }));

// --- Comandos siguiente/anterior ---
$$(".cmd[data-action]").forEach((b) =>
  b.addEventListener("click", () =>
    socket.emit("engine_command", { action: b.dataset.action })));

// --- Sistema ---
$("#reboot").addEventListener("click", () => {
  if (confirm("Reiniciar la Raspberry Pi?")) socket.emit("system", { action: "reboot" });
});
$("#shutdown").addEventListener("click", () => {
  if (confirm("Apagar la Raspberry Pi?")) socket.emit("system", { action: "shutdown" });
});

// ==========================================================================
// WebSocket
// ==========================================================================
// Al conectar, el panel se presenta para que el proyector deje de mostrar
// la pantalla del codigo QR.
socket.on("connect", () => socket.emit("hello", { role: "panel" }));
socket.on("state", (next) => { state = next; render(); });
socket.on("status", (s) => {
  if (!state) return;
  state.status.label = s.label;
  state.audio.bpm = s.bpm;
  $("#now").textContent = s.label || "-";
  $("#bpm").textContent = s.bpm > 0 ? s.bpm : "--";
});
socket.on("notify", (entry) => showNotif(entry));
socket.on("disconnect", () => { $("#conn").className = "dot off"; });

// ==========================================================================
// Arranque
// ==========================================================================
buildMixerSliders();
loadData();