// Audio Wave + Segments — waveform + playback, a fixed subsegment grid (721 frames @ fps),
// per-chunk notes auto-filled into the `notes` box, playhead + click-to-seek.
// First cut: open the browser console for [audiowave] logs if something misbehaves.
import { app } from "../../scripts/app.js";
import { api } from "../../scripts/api.js";

function getW(node, name) { return node.widgets?.find((w) => w.name === name); }

function computePeaks(buf, n) {
  const data = buf.getChannelData(0);
  const block = Math.max(1, Math.floor(data.length / n));
  const peaks = new Float32Array(n);
  let max = 1e-6;
  for (let i = 0; i < n; i++) {
    let m = 0;
    const s = i * block;
    for (let j = 0; j < block && s + j < data.length; j++) { const v = Math.abs(data[s + j]); if (v > m) m = v; }
    peaks[i] = m; if (m > max) max = m;
  }
  for (let i = 0; i < n; i++) peaks[i] /= max;
  return peaks;
}

// Keep a ComfyUI DOM widget at full node width (fixes the collapse-to-half-width bug on
// selection / re-layout). Portable helper; call once after addDOMWidget.
function keepDomWidgetFullWidth(node, container) {
  const GRID_SEL = '[data-testid="node-widgets"], .lg-node-widgets';
  const ROW_SEL = '[data-testid="node-widget"], .lg-node-widget';
  const MAX_MARGIN = 40;
  let enforcing = false, marginLogical = Infinity, gridObserver = null;

  function refFromDom() {
    const grid = container.closest(GRID_SEL);
    if (!grid) return 0;
    let w = 0;
    for (const row of Array.from(grid.querySelectorAll(ROW_SEL))) {
      if (row.contains(container)) continue;
      const c = row.lastElementChild;
      if (c && c.clientWidth > w) w = c.clientWidth;
    }
    if (!w && grid.clientWidth > 0) {
      const dot = grid.querySelector(`${ROW_SEL.split(",")[0]} > :first-child`);
      w = grid.clientWidth - (dot?.offsetWidth ?? 0);
    }
    return w;
  }
  function refFromNodeSize(cw) {
    const nodeW = node.size?.[0] ?? 0;
    if (nodeW <= 0) return 0;
    if (cw > 0) { const m = nodeW - cw; if (m >= 0 && m < marginLogical) marginLogical = Math.min(m, MAX_MARGIN); }
    const margin = Number.isFinite(marginLogical) ? marginLogical : MAX_MARGIN / 2;
    return Math.round(nodeW - margin);
  }
  function reference(cw) {
    let w = refFromDom();
    if (!w) w = refFromNodeSize(cw);
    if (!w) for (const wd of node.widgets ?? []) { const el = wd.inputEl || wd.element; if (el && el !== container && el.offsetWidth > w) w = el.offsetWidth; }
    if (!w && container.parentElement) w = container.parentElement.clientWidth;
    return w;
  }
  function enforce() {
    if (enforcing) return;
    if (!gridObserver) { const grid = container.closest(GRID_SEL); if (grid) { gridObserver = new ResizeObserver(enforce); gridObserver.observe(grid); } }
    const cw = container.clientWidth;
    const ref = reference(cw);
    if (ref > 0 && Math.abs(cw - ref) > 2) { enforcing = true; container.style.width = ref + "px"; requestAnimationFrame(() => { enforcing = false; }); }
  }
  const ro = new ResizeObserver(enforce);
  ro.observe(container);
  const origOnResize = node.onResize;
  node.onResize = function (size) { origOnResize?.call(this, size); enforce(); };
  return () => { ro.disconnect(); gridObserver?.disconnect(); };
}

function setupWave(node) {
  const st = { duration: 0, peaks: null, audio: new Audio(), playing: false };
  node._wave = st;

  const wrap = document.createElement("div");
  wrap.style.cssText = "display:flex;flex-direction:column;gap:4px;width:100%;";
  const bar = document.createElement("div");
  bar.style.cssText = "display:flex;gap:6px;align-items:center;font-size:10px;color:#bbb;flex-wrap:wrap;";
  const mk = (t) => { const b = document.createElement("button"); b.textContent = t; b.style.cssText = "font-size:10px;padding:1px 6px;"; return b; };
  const playBtn = mk("▶ play"), upBtn = mk("upload");
  const readout = document.createElement("span"); readout.textContent = "0.00 / 0.00s";
  const hint = document.createElement("span"); hint.textContent = "click=seek · dblclick a chunk=note";
  bar.append(playBtn, upBtn, readout, hint);
  const canvas = document.createElement("canvas");
  canvas.width = 640; canvas.height = 160;
  canvas.style.cssText = "width:100%;height:160px;background:#141418;border-radius:4px;cursor:pointer;";
  wrap.append(bar, canvas);
  // Neutral type (NOT "preview" — that triggers aspect-ratio sizing that collapses width),
  // with an explicit height, then pin the width against the collapse-on-select bug.
  node.addDOMWidget("wave", "wave", wrap, { serialize: false, getMinHeight: () => 205 });
  const cleanupWidth = keepDomWidgetFullWidth(node, wrap);
  const origRemoved = node.onRemoved;
  node.onRemoved = function () { try { cleanupWidth(); } catch (e) { /* ignore */ } return origRemoved?.apply(this, arguments); };
  const ctx = canvas.getContext("2d");

  const sjw = getW(node, "segments_json");            // machine field — hide it
  if (sjw) { sjw.hidden = true; sjw.computeSize = () => [0, -4]; }

  const fps = () => Math.max(1, Number(getW(node, "fps")?.value) || 24);
  const subFrames = () => Math.max(0, Number(getW(node, "subsegment_frames")?.value) || 0);
  const t2x = (t) => (st.duration ? (t / st.duration) * canvas.width : 0);
  const x2t = (x) => (st.duration ? (x / canvas.width) * st.duration : 0);

  function chunkStarts() {
    const step = subFrames() / fps();
    const arr = [];
    if (!st.duration || !step) return [0];
    for (let t = 0; t < st.duration - 1e-6; t += step) arr.push(t);
    return arr.length ? arr : [0];
  }

  function parseNotes(txt) {
    const seg = {}, glob = [];
    (txt || "").split("\n").forEach((l) => {
      const m = l.match(/^\s*(?:seg(?:ment)?|s)?\s*(\d+)\s*[:)]\s*(.*)$/i);
      if (m) seg[parseInt(m[1])] = m[2]; else if (l.trim()) glob.push(l);
    });
    return { seg, glob };
  }

  function syncNotesBox() {                            // one "segN:" line per chunk, preserve notes
    const nw = getW(node, "notes"); if (!nw) return;
    const { seg, glob } = parseNotes(nw.value);
    const n = chunkStarts().length;
    const lines = [];
    for (let i = 1; i <= n; i++) lines.push(`seg${i}: ${seg[i] !== undefined ? seg[i] : ""}`);
    const val = lines.concat(glob).join("\n");
    if (nw.value !== val) { nw.value = val; nw.callback?.(val); }
  }

  function setChunkNote(i, val) {
    const nw = getW(node, "notes"); if (!nw) return;
    const { seg, glob } = parseNotes(nw.value);
    seg[i] = val;
    const n = chunkStarts().length;
    const lines = [];
    for (let k = 1; k <= n; k++) lines.push(`seg${k}: ${seg[k] !== undefined ? seg[k] : ""}`);
    nw.value = lines.concat(glob).join("\n"); nw.callback?.(nw.value);
  }

  function draw() {
    ctx.fillStyle = "#141418"; ctx.fillRect(0, 0, canvas.width, canvas.height);
    if (st.peaks) {
      ctx.fillStyle = "#3c8cdc";
      const n = st.peaks.length, bw = canvas.width / n;
      for (let i = 0; i < n; i++) { const h = st.peaks[i] * (canvas.height - 30); ctx.fillRect(i * bw, canvas.height - h, Math.max(1, bw), h); }
    }
    ctx.font = "10px monospace";
    const { seg } = parseNotes(getW(node, "notes")?.value);
    const starts = chunkStarts();
    starts.forEach((s, i) => {
      const x = t2x(s);
      ctx.strokeStyle = "#7ec8a0"; ctx.beginPath(); ctx.moveTo(x, 0); ctx.lineTo(x, canvas.height); ctx.stroke();
      ctx.fillStyle = "#fff"; ctx.fillText(`S${i + 1} ${s.toFixed(1)}s`, x + 3, 11);
      if (seg[i + 1]) { ctx.fillStyle = "#ffd27a"; ctx.fillText(seg[i + 1].slice(0, 22), x + 3, 23); }
    });
    if (st.playing || st.audio.currentTime) {
      const x = t2x(st.audio.currentTime);
      ctx.strokeStyle = "#ff5a3c"; ctx.beginPath(); ctx.moveTo(x, 0); ctx.lineTo(x, canvas.height); ctx.stroke();
    }
    readout.textContent = `${(st.audio.currentTime || 0).toFixed(2)} / ${st.duration.toFixed(2)}s`;
  }

  async function loadFile(name) {
    if (!name || name.startsWith("(")) return;
    const url = `/view?filename=${encodeURIComponent(name)}&type=input&subfolder=`;
    try {
      const ab = await (await fetch(url)).arrayBuffer();
      const ac = new (window.AudioContext || window.webkitAudioContext)();
      const buf = await ac.decodeAudioData(ab.slice(0));
      st.duration = buf.duration; st.peaks = computePeaks(buf, canvas.width);
      st.audio.src = url; syncNotesBox(); draw();
    } catch (e) { console.error("[audiowave] could not load/decode", name, e); }
  }

  canvas.addEventListener("mousedown", (e) => {         // click = seek
    const r = canvas.getBoundingClientRect();
    st.audio.currentTime = Math.max(0, Math.min(st.duration, x2t(((e.clientX - r.left) / r.width) * canvas.width)));
    draw();
  });
  canvas.addEventListener("dblclick", (e) => {          // dblclick a chunk = edit its note
    const r = canvas.getBoundingClientRect();
    const t = x2t(((e.clientX - r.left) / r.width) * canvas.width);
    const starts = chunkStarts(); let i = 0; for (let k = 0; k < starts.length; k++) if (t >= starts[k]) i = k;
    const { seg } = parseNotes(getW(node, "notes")?.value);
    const val = window.prompt(`Note for subsegment ${i + 1}:`, seg[i + 1] || "");
    if (val !== null) { setChunkNote(i + 1, val); draw(); }
  });

  const loop = () => { if (!st.playing) return; draw(); requestAnimationFrame(loop); };
  playBtn.onclick = () => {
    if (st.audio.paused) { st.audio.play().catch((e) => console.error("[audiowave] play", e)); st.playing = true; playBtn.textContent = "⏸ pause"; loop(); }
    else { st.audio.pause(); st.playing = false; playBtn.textContent = "▶ play"; }
  };
  st.audio.onended = () => { st.playing = false; playBtn.textContent = "▶ play"; draw(); };

  upBtn.onclick = () => {
    const inp = document.createElement("input"); inp.type = "file"; inp.accept = "audio/*";
    inp.onchange = async () => {
      const f = inp.files[0]; if (!f) return;
      const fd = new FormData(); fd.append("image", f, f.name); fd.append("type", "input");
      try {
        const res = await api.fetchApi("/upload/image", { method: "POST", body: fd });
        const j = await res.json(); const name = j.name || f.name;
        const w = getW(node, "audio"); if (w) { if (!w.options.values.includes(name)) w.options.values.push(name); w.value = name; }
        await loadFile(name);
      } catch (e) { console.error("[audiowave] upload failed (drop the file in ComfyUI/input instead)", e); }
    };
    inp.click();
  };

  // re-grid + re-fill notes when the audio, fps or subsegment_frames change
  const hook = (name, fn) => { const w = getW(node, name); if (w) { const cb = w.callback; w.callback = function () { const r = cb ? cb.apply(this, arguments) : undefined; fn(); return r; }; } };
  hook("audio", () => loadFile(getW(node, "audio")?.value));
  hook("fps", () => { syncNotesBox(); draw(); });
  hook("subsegment_frames", () => { syncNotesBox(); draw(); });
  const aw = getW(node, "audio"); if (aw?.value) loadFile(aw.value);
  draw();
}

app.registerExtension({
  name: "promptcalib.audiowave",
  async beforeRegisterNodeDef(nodeType, nodeData) {
    if (nodeData?.name !== "AudioWaveSegments") return;
    const orig = nodeType.prototype.onNodeCreated;
    nodeType.prototype.onNodeCreated = function () {
      const r = orig?.apply(this, arguments);
      try { setupWave(this); } catch (e) { console.error("[audiowave] setup failed", e); }
      return r;
    };
  },
});