import { useState, useRef, useEffect, useCallback, useMemo } from "react";
import BlockChain from "./BlockChain.jsx";
import FootswitchBar from "./FootswitchBar.jsx";
import TunerScreen from "./Tuner.jsx";
import FocusView from "./FocusView.jsx";
import ModelBrowser from "./ModelBrowser.jsx";
import MainMenu from "./MainMenu.jsx";
import GlobalSettings from "./GlobalSettings.jsx";
import GlobalEQ from "./GlobalEQ.jsx";

// ── API Layer ──────────────────────────────────────────────────────
const API_BASE = "";

async function api(method, path, body) {
  const opts = { method, headers: { "Content-Type": "application/json" } };
  if (body) opts.body = JSON.stringify(body);
  const res = await fetch(`${API_BASE}${path}`, opts);
  if (!res.ok) throw new Error(`API ${method} ${path}: ${res.status}`);
  return res.json();
}

const API = {
  getState:      ()                              => api("GET",  "/api/state"),
  getVu:         ()                              => api("GET",  "/api/vu"),
  updateBlock:   (id, params)                    => api("PATCH", "/api/block-params", { id, ...params }),
  toggleBlock:   (id, enabled)                   => api("PATCH", "/api/blocks", { id, enabled }),
  bypassToggle:  ()                              => api("POST", "/api/bypass/toggle"),
  masterVolume:  (v)                             => api("POST", "/api/volume", { volume: v / 100 }),
  listModels:    ()                              => api("GET",  "/api/models"),
  loadModel:     (path)                          => api("POST", "/api/models/load", { path }),
  listPresets:   ()                              => api("GET",  "/api/presets"),
  getPreset:     (bank, program)                 => api("GET",  `/api/presets/${bank}/${program}`),
  activatePreset:(bank, program)                 => api("POST", `/api/presets/${bank}/${program}/activate`),
  savePreset:    (bank, program, name, tags)     => api("PUT",  "/api/presets", { bank, program, name, tags }),
  setAudioProfile:(rate, period)                 => api("POST", "/api/audio/profile", { profile: "stable", rate: parseInt(rate), period: parseInt(period) }),
  getAudioProfile:()                            => api("GET",  "/api/audio/profile"),
  getRouting:    ()                              => api("GET",  "/api/routing"),
  setRouting:    (mode, breakpoint)              => api("POST", "/api/routing", { routing_mode: mode, routing_breakpoint: breakpoint }),
  saveSettings:  (settings)                      => api("POST", "/api/settings", settings),
  searchModels:  (q)                             => api("GET",  `/api/tonehub/search?q=${encodeURIComponent(q)}`),
  searchIrs:     (q)                             => api("GET",  `/api/tonehub/search/irs?q=${encodeURIComponent(q)}`),
  installModel:  (url, name)                     => api("POST", "/api/models/tonedownload/install", { download_url: url, name }),
  installIr:     (url, name)                     => api("POST", "/api/irs/tonedownload/install", { download_url: url, name }),
  tunerToggle:   (enabled)                       => api("POST", "/api/tuner", { enabled }),
};

// ── Design tokens ──────────────────────────────────────────────
const T = {
  bg: "#0A0A0C",
  panel: "#141418",
  surface: "#1C1C22",
  border: "#2A2A32",
  amber: "#E8A030",
  amberDim: "#7A5218",
  blue: "#3A7BA8",
  blueDim: "#1E4060",
  green: "#3AB87A",
  red: "#C84040",
  textPrimary: "#F0EDE6",
  textSec: "#8888A0",
  textDim: "#444458",
};

// ── Block parameter definitions ─────────────────────────────────
const SPLIT_TYPES = [
  { value:'y', label:'Y — Split evenly', pan:true },
  { value:'ab', label:'A/B — Route to A or B', pan:false },
  { value:'cascade', label:'Cascade — A feeds B', pan:true },
  { value:'a_to_b', label:'A→B — Serial extension', pan:false },
];

const BLOCK_PARAMS = {
  overdrive:    [{ key:'drive', label:'Drive', min:0, max:100, def:30 }, { key:'tone', label:'Tone', min:0, max:100, def:50 }, { key:'level', label:'Level', min:0, max:100, def:70 }],
  distortion:   [{ key:'drive', label:'Drive', min:0, max:100, def:50 }, { key:'tone', label:'Tone', min:0, max:100, def:40 }, { key:'level', label:'Level', min:0, max:100, def:60 }],
  fuzz:         [{ key:'fuzz', label:'Fuzz', min:0, max:100, def:60 }, { key:'tone', label:'Tone', min:0, max:100, def:30 }, { key:'level', label:'Level', min:0, max:100, def:60 }],
  delay:        [{ key:'time', label:'Time', min:0, max:100, def:40 }, { key:'feedback', label:'Feedback', min:0, max:100, def:30 }, { key:'mix', label:'Mix', min:0, max:100, def:35 }],
  echo:         [{ key:'time', label:'Time', min:0, max:100, def:40 }, { key:'feedback', label:'Feedback', min:0, max:100, def:30 }, { key:'mix', label:'Mix', min:0, max:100, def:35 }],
  reverb:       [{ key:'decay', label:'Decay', min:0, max:100, def:50 }, { key:'mix', label:'Mix', min:0, max:100, def:30 }, { key:'tone', label:'Tone', min:0, max:100, def:50 }],
  chorus:       [{ key:'rate', label:'Rate', min:0, max:100, def:40 }, { key:'depth', label:'Depth', min:0, max:100, def:40 }, { key:'mix', label:'Mix', min:0, max:100, def:30 }],
  flanger:      [{ key:'rate', label:'Rate', min:0, max:100, def:30 }, { key:'depth', label:'Depth', min:0, max:100, def:50 }, { key:'feedback', label:'Feedback', min:0, max:100, def:40 }, { key:'mix', label:'Mix', min:0, max:100, def:30 }],
  phaser:       [{ key:'rate', label:'Rate', min:0, max:100, def:30 }, { key:'depth', label:'Depth', min:0, max:100, def:50 }, { key:'feedback', label:'Feedback', min:0, max:100, def:40 }, { key:'mix', label:'Mix', min:0, max:100, def:30 }],
  compressor:   [{ key:'threshold', label:'Thresh', min:0, max:100, def:50 }, { key:'ratio', label:'Ratio', min:1, max:20, def:4 }, { key:'gain', label:'Gain', min:0, max:100, def:50 }],
  gate:         [{ key:'threshold', label:'Thresh', min:0, max:100, def:30 }, { key:'release', label:'Release', min:0, max:100, def:50 }],
  eq:           [{ key:'low', label:'Low', min:-12, max:12, def:0 }, { key:'mid', label:'Mid', min:-12, max:12, def:0 }, { key:'high', label:'High', min:-12, max:12, def:0 }, { key:'level', label:'Level', min:0, max:100, def:70 }],
  cabinet:      [{ key:'level', label:'Level', min:0, max:100, def:75 }],
  ir:           [{ key:'level', label:'Level', min:0, max:100, def:75 }],
  split:        [{ key:'splitType', label:'Split Type', type:'select', options:SPLIT_TYPES, def:'y' },
                 { key:'panA', label:'Pan A', min:0, max:100, def:50, conditional: (p) => p.splitType !== 'ab' },
                 { key:'panB', label:'Pan B', min:0, max:100, def:50, conditional: (p) => p.splitType !== 'ab' },
                 { key:'activePath', label:'Active Path', type:'select', options:[{value:'A',label:'A'},{value:'B',label:'B'}], def:'A', conditional: (p) => p.splitType === 'ab' }],
  merge:        [{ key:'blend', label:'Blend', min:0, max:100, def:100 },
                 { key:'levelA', label:'Level A', min:0, max:100, def:100 },
                 { key:'panA', label:'Pan A', min:-100, max:100, def:0 },
                 { key:'levelB', label:'Level B', min:0, max:100, def:100 },
                 { key:'panB', label:'Pan B', min:-100, max:100, def:0 }],
};

const BLOCK_COLORS = {
  overdrive: T.amber, distortion: T.red, fuzz: '#C07030',
  delay: T.blue, echo: T.blue, reverb: '#60B0D0',
  chorus: T.green, flanger: '#50C080', phaser: '#80C050',
  tremolo: T.green, compressor: '#D09040', gate: T.textSec, eq: '#7080D0',
  cabinet: '#D07090', ir: '#D07090', nam: '#E0A040', nam_amp: '#E0A040', boost: T.amber,
  wah: '#D0A060', volume: T.textSec, tuner: '#80D0A0',
  split: '#B080C0', merge: '#80B0C0',
};

const BLOCK_DISPLAY_NAMES = {
  overdrive: "OD-808", distortion: "RAT", fuzz: "Big Muff",
  delay: "Digital Delay", echo: "Tape Echo", reverb: "Hall Reverb",
  chorus: "Chorus", flanger: "Flanger", phaser: "Phase 90",
  tremolo: "Tremolo", compressor: "Compressor", gate: "Noise Gate",
  eq: "EQ", cabinet: "Cabinet", ir: "IR Loader", nam: "NAM Model", nam_amp: "NAM Model",
  boost: "Clean Boost", wah: "Wah", volume: "Volume", tuner: "Tuner",
  loop: "FX Loop",
  split: "Split", merge: "Merge",
};

function getBlockParams(type) {
  return BLOCK_PARAMS[(type || '').toLowerCase()] || [{ key:'level', label:'Level', min:0, max:100, def:50 }];
}
function getBlockColor(type) {
  return BLOCK_COLORS[(type || '').toLowerCase()] || T.amber;
}
function getBlockDisplayName(block) {
  const key = (block.type || '').toLowerCase();
  // If it has a NAM model path, show the model filename
  if (block.nam_model_path) {
    const parts = block.nam_model_path.split('/').pop()?.replace(/\.(nam|wav|aiff?)$/i, '') || '';
    return parts || 'NAM Model';
  }
  // If it has an IR file path, show the filename
  if (block.ir_file_path) {
    const parts = block.ir_file_path.split('/').pop()?.replace(/\.(wav|aiff?|ir)$/i, '') || '';
    return parts || 'IR Loader';
  }
  return BLOCK_DISPLAY_NAMES[key] || key.charAt(0).toUpperCase() + key.slice(1);
}

// ── CSS ─────────────────────────────────────────────────────
const css = `
  @import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;700&family=Inter:wght@300;400;500;600&display=swap');
  * { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; user-select: none; }
  html, body { height: 100%; overflow: hidden; background: ${T.bg}; }
  body { color: ${T.textPrimary}; font-family: 'Inter', sans-serif; }
  :root { --amber: ${T.amber}; --blue: ${T.blue}; --green: ${T.green}; }
  .mono { font-family: 'JetBrains Mono', monospace; }
  ::-webkit-scrollbar { width: 4px; height: 4px; }
  ::-webkit-scrollbar-track { background: ${T.panel}; }
  ::-webkit-scrollbar-thumb { background: ${T.border}; border-radius: 2px; }

  /* ── Knob ── */
  .knob-wrap { display: flex; flex-direction: column; align-items: center; gap: 4px; cursor: pointer; }
  .knob { border-radius: 50%; position: relative; touch-action: none; }
  .knob-inner { border-radius: 50%; width: 100%; height: 100%; position: relative;
    background: radial-gradient(circle at 35% 30%, #3A3A48, #1A1A22);
    box-shadow: 0 2px 8px rgba(0,0,0,.6), inset 0 1px 0 rgba(255,255,255,.07); }
  .knob-dot { position: absolute; width: 3px; border-radius: 2px; background: var(--amber);
    left: 50%; transform-origin: bottom center; box-shadow: 0 0 6px var(--amber); }
  .knob-label { font-size: 9px; color: ${T.textSec}; letter-spacing: .06em; text-transform: uppercase; text-align: center; }
  .knob-value { font-family: 'JetBrains Mono', monospace; font-size: 10px; color: ${T.amber}; }

  /* ── Buttons ── */
  .btn { padding: 8px 14px; border-radius: 6px; font-size: 12px; font-weight: 600;
    letter-spacing: .04em; border: none; cursor: pointer; transition: all .12s; }
  .btn-primary { background: ${T.amber}; color: #000; }
  .btn-primary:active { filter: brightness(.85); transform: scale(.97); }
  .btn-ghost { background: ${T.surface}; color: ${T.textPrimary}; border: 1px solid ${T.border}; }
  .btn-ghost:active { background: ${T.border}; }
  .btn-icon { width: 32px; height: 32px; border-radius: 7px; display: flex; align-items: center;
    justify-content: center; background: ${T.surface}; border: 1px solid ${T.border}; cursor: pointer;
    font-size: 15px; transition: all .12s; flex-shrink: 0; }
  .btn-icon:active { transform: scale(.93); }
  .btn-icon.active { background: rgba(232,160,48,.15); border-color: ${T.amber}; color: ${T.amber}; }

  /* ── Badge ── */
  .badge { display: inline-flex; align-items: center; justify-content: center;
    padding: 2px 7px; border-radius: 4px; font-size: 10px; font-weight: 700;
    letter-spacing: .06em; text-transform: uppercase; }
  .badge-amber { background: rgba(232,160,48,.2); color: ${T.amber}; }
  .badge-green { background: rgba(58,184,122,.2); color: ${T.green}; }
  .badge-blue { background: rgba(58,123,168,.2); color: ${T.blue}; }

  /* ── Param slider ── */
  .param-panel { background: ${T.surface}; padding: 8px 12px 6px; border-top: 1px solid ${T.border}; flex-shrink: 0; }
  .param-panel-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 2px; }
  .param-panel-title { font-size: 10px; font-weight: 600; letter-spacing: .07em; text-transform: uppercase; color: ${T.textSec}; }
  .param-row { display: flex; flex-direction: column; gap: 1px; padding: 1px 0; }
  .param-header { display: flex; justify-content: space-between; align-items: center; }
  .param-label { font-size: 9px; font-weight: 500; text-transform: uppercase; letter-spacing: .06em; color: ${T.textSec}; }
  .param-val { font-family: 'JetBrains Mono',monospace; font-size: 11px; font-weight: 600; }
  .param-track-wrap { position: relative; height: 30px; display: flex; align-items: center; cursor: pointer; touch-action: none; }
  .param-track { width: 100%; height: 6px; background: ${T.border}; border-radius: 3px; position: relative; overflow: hidden; }
  .param-fill { height: 100%; border-radius: 3px; position: absolute; top: 0; left: 0; transition: width .04s; }
  .param-thumb { width: 22px; height: 22px; border-radius: 50%; position: absolute; top: 50%;
    transform: translate(-50%,-50%); box-shadow: 0 1px 6px rgba(0,0,0,.6); pointer-events: none;
    border: 3px solid ${T.bg}; }
  .param-btn { width: 28px; height: 28px; border-radius: 50%; border: 1px solid ${T.border};
    background: ${T.panel}; color: ${T.textPrimary}; font-size: 14px; font-weight: 700;
    display: flex; align-items: center; justify-content: center; cursor: pointer; line-height: 1; }
  .param-btn:active { background: ${T.border}; transform: scale(.92); }
  .param-knobs { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; padding: 4px 0; }

  /* ── Screen header (overlays) ── */
  .screen-header { padding: 10px 14px 8px; display: flex; align-items: center;
    justify-content: space-between; border-bottom: 1px solid ${T.border}; }
  .screen-title { font-size: 12px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: ${T.textSec}; }
  .screen-body { flex: 1; overflow-y: auto; padding: 10px 12px; display: flex; flex-direction: column; gap: 10px; }

  /* ── Preset sidebar chip ── */
  .preset-chip-s { width: 100%; padding: 7px 6px; border-radius: 5px; background: ${T.surface}; border: 1px solid ${T.border};
    display: flex; flex-direction: column; align-items: center; cursor: pointer; transition: all .12s; }
  .preset-chip-s.active { border-color: ${T.amber}; background: rgba(232,160,48,.08); }
  .preset-chip-s:active { transform: scale(.96); }
  .preset-chip-s .pcs-num { font-family: 'JetBrains Mono',monospace; font-size: 14px; font-weight: 700; color: ${T.amber}; line-height: 1.1; }
  .preset-chip-s .pcs-name { font-size: 9px; color: ${T.textSec}; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 100%; text-align: center; line-height: 1.2; }
  .preset-chip-s .pcs-indicator { width: 4px; height: 4px; border-radius: 50%; margin-top: 3px; }

  /* ── Preset row (captures) ── */
  .preset-row { display: flex; align-items: center; gap: 10px; padding: 9px 12px;
    border-radius: 6px; cursor: pointer; transition: background .12s; border: 1px solid transparent; }
  .preset-row:active, .preset-row.active { background: rgba(232,160,48,.08); border-color: rgba(232,160,48,.25); }
  .section-label { font-size: 10px; letter-spacing: .1em; text-transform: uppercase;
    color: ${T.textDim}; font-weight: 600; margin-bottom: 8px; }
  .card { background: ${T.panel}; border: 1px solid ${T.border}; border-radius: 8px; padding: 14px; }
  .card-sm { background: ${T.surface}; border: 1px solid ${T.border}; border-radius: 6px; padding: 10px; }
`;

// ── Knob ──────────────────────────────────────────────────────
function Knob({ label, value = 50, onChange, size = 48, color = T.amber, min = 0, max = 100 }) {
  const startRef = useRef(null);
  const norm = (value - min) / (max - min);
  const angle = -140 + norm * 280;
  const dotH = size * 0.38;
  const dotTop = size * 0.5 - dotH;

  const handleStart = (e) => {
    e.preventDefault();
    const clientY = e.touches ? e.touches[0].clientY : e.clientY;
    startRef.current = { y: clientY, val: value };
    const move = (ev) => {
      const cy = ev.touches ? ev.touches[0].clientY : ev.clientY;
      const delta = (startRef.current.y - cy) / 120;
      const next = Math.max(min, Math.min(max, startRef.current.val + delta * (max - min)));
      onChange?.(Math.round(next));
    };
    const up = () => { window.removeEventListener("mousemove",move);window.removeEventListener("mouseup",up);
      window.removeEventListener("touchmove",move);window.removeEventListener("touchend",up); };
    window.addEventListener("mousemove",move);window.addEventListener("mouseup",up);
    window.addEventListener("touchmove",move,{passive:false});window.addEventListener("touchend",up);
  };

  const svgSize=size+12,cx=svgSize/2,cy=svgSize/2,r=size/2+3;
  const lx=cx+r*Math.cos((-140-90)*(Math.PI/180)),ly=cy+r*Math.sin((-140-90)*(Math.PI/180));
  const ex=cx+r*Math.cos((angle-90)*(Math.PI/180)),ey=cy+r*Math.sin((angle-90)*(Math.PI/180));
  const large=norm*280>180?1:0;

  return (
    <div className="knob-wrap" style={{width:size+12}}>
      <div className="knob" style={{width:size,height:size}} onMouseDown={handleStart} onTouchStart={handleStart}>
        <svg style={{position:"absolute",inset:-6,width:svgSize,height:svgSize,overflow:"visible"}}>
          <circle cx={cx} cy={cy} r={r} fill="none" stroke={T.border} strokeWidth="2" strokeLinecap="round" opacity=".5"/>
          {norm>0&&<path d={`M ${lx} ${ly} A ${r} ${r} 0 ${large} 1 ${ex} ${ey}`} fill="none" stroke={color} strokeWidth="2" strokeLinecap="round" style={{filter:`drop-shadow(0 0 3px ${color})`}}/>}
        </svg>
        <div className="knob-inner" style={{"--amber":color}}>
          <div className="knob-dot" style={{height:dotH,top:dotTop,transform:`translateX(-50%) rotate(${angle}deg)`,transformOrigin:`50% ${dotH}px`}}/>
        </div>
      </div>
      <div className="knob-value mono" style={{color}}>{value}</div>
      <div className="knob-label">{label}</div>
    </div>
  );
}

// ── Param Slider ──────────────────────────────────────────────
function ParamSlider({ label,value=50,onChange,onChangeEnd,min=0,max=100,color=T.amber }) {
  const trackRef=useRef(null);const dragRef=useRef(false);const lastValRef=useRef(value);
  const onChangeRef=useRef(onChange);const onChangeEndRef=useRef(onChangeEnd);
  const pct=((value-min)/(max-min))*100;

  useEffect(()=>{onChangeRef.current=onChange;},[onChange]);
  useEffect(()=>{onChangeEndRef.current=onChangeEnd;},[onChangeEnd]);

  const valFromEvent=useCallback((e)=>{
    const t=trackRef.current;if(!t)return value;
    const r=t.getBoundingClientRect();
    const x=(e.touches?e.touches[0].clientX:e.clientX)-r.left;
    return Math.round(min+Math.max(0,Math.min(1,x/r.width))*(max-min));
  },[min,max,value]);

  useEffect(()=>{
    const move=(e)=>{if(!dragRef.current)return;e.preventDefault();const v=valFromEvent(e);lastValRef.current=v;onChangeRef.current?.(v);};
    const up=()=>{if(dragRef.current){onChangeEndRef.current?.(lastValRef.current);dragRef.current=false}};
    window.addEventListener('mousemove',move);window.addEventListener('mouseup',up);
    window.addEventListener('touchmove',move,{passive:false});window.addEventListener('touchend',up);
    return()=>{window.removeEventListener('mousemove',move);window.removeEventListener('mouseup',up);
      window.removeEventListener('touchmove',move);window.removeEventListener('touchend',up);};
  },[valFromEvent]);

  const handleStart=(e)=>{e.preventDefault();const v=valFromEvent(e);lastValRef.current=v;dragRef.current=true;onChangeRef.current?.(v);};
  const quick=(delta)=>(e)=>{e.preventDefault();e.stopPropagation();const next=Math.max(min,Math.min(max,value+delta));onChangeRef.current?.(next);onChangeEndRef.current?.(next);};

  return (
    <div className="param-row">
      <div className="param-header">
        <span className="param-label" style={{color}}>{label}</span>
        <div style={{display:'flex',gap:4,alignItems:'center'}}>
          <button className="param-btn" onMouseDown={quick(-5)} onTouchStart={quick(-5)}>−</button>
          <span className="param-val" style={{color}}>{value}</span>
          <button className="param-btn" onMouseDown={quick(5)} onTouchStart={quick(5)}>+</button>
        </div>
      </div>
      <div className="param-track-wrap" ref={trackRef} onMouseDown={handleStart} onTouchStart={handleStart}>
        <div className="param-track">
          <div className="param-fill" style={{width:`${pct}%`,background:color}}/>
          <div className="param-thumb" style={{left:`${pct}%`,background:color}}/>
        </div>
      </div>
    </div>
  );
}

// ── Select Param ────────────────────────────────────────────
function SelectParam({ def, value, color, onChange }) {
  return (
    <div className="param-row">
      <div className="param-header">
        <span className="param-label" style={{color}}>{def.label}</span>
      </div>
      <div style={{
        display: "flex", gap: 4, flexWrap: "wrap",
        background: "#0A0A10", borderRadius: 6, padding: 4,
      }}>
        {(def.options || []).map(opt => (
          <button key={opt.value}
            onClick={() => onChange?.(opt.value)}
            style={{
              flex: 1, padding: "5px 8px", borderRadius: 4, border: "none",
              fontSize: 10, fontWeight: 600, cursor: "pointer",
              background: value === opt.value ? color : "transparent",
              color: value === opt.value ? "#000" : "#8888A0",
              transition: "all .1s", letterSpacing: ".03em",
              whiteSpace: "nowrap",
            }}
          >
            {opt.label}
          </button>
        ))}
      </div>
    </div>
  );
}

// ── Parameter Panel ──────────────────────────────────────────
function ParameterPanel({ block,params,onParamChange,onParamChangeEnd,viewMode,onToggleView,onFocus,onModelBrowser }) {
  const defs=getBlockParams(block.type);const color=getBlockColor(block.type);
  const visibleDefs = defs.filter(d => !d.conditional || d.conditional(params));
  return (
    <div className="param-panel">
      <div className="param-panel-header">
        <span className="param-panel-title" style={{cursor:onModelBrowser?'pointer':'default'}}
          onClick={()=>onModelBrowser?.(block.id)}>
          <span style={{color}}>●</span> {block.name||block.type||''}
          {onModelBrowser&&<span style={{marginLeft:4,fontSize:8,color:T.textDim}}>▼</span>}
        </span>
        <div style={{display:'flex',gap:4,alignItems:'center'}}>
          {onFocus&&<button className="btn" style={{padding:'4px 8px',fontSize:9,fontWeight:600,background:`${T.amber}22`,border:`1px solid ${T.amber}44`,color:T.amber,borderRadius:5,letterSpacing:'.04em',cursor:'pointer'}}
            onClick={onFocus}>🔍 Focus</button>}
          <button className="btn-icon" style={{width:26,height:26,fontSize:11,flexShrink:0}}
            onClick={onToggleView}>{viewMode==='slider'?'◉':'▦'}</button>
        </div>
      </div>
      {viewMode==='slider'?visibleDefs.map(p=>(
        p.type === 'select' ? (
          <SelectParam key={p.key} def={p} value={params[p.key]!=null?params[p.key]:p.def}
            color={color}
            onChange={v=>{onParamChange?.(p.key,v);onParamChangeEnd?.(p.key,v);}}/>
        ) : (
          <ParamSlider key={p.key} label={p.label}
            value={params[p.key]!=null?params[p.key]:p.def} min={p.min} max={p.max} color={color}
            onChange={v=>onParamChange?.(p.key,v)} onChangeEnd={v=>onParamChangeEnd?.(p.key,v)}/>
        )
      )):(
        visibleDefs.filter(p => p.type !== 'select').length > 0 && (
          <div className="param-knobs">{visibleDefs.filter(p => p.type !== 'select').map(p=>(
            <Knob key={p.key} label={p.label}
              value={params[p.key]!=null?params[p.key]:p.def} min={p.min} max={p.max} size={48} color={color}
              onChange={v=>{onParamChange?.(p.key,v);onParamChangeEnd?.(p.key,v);}}/>
          ))}</div>
        )
      )}
    </div>
  );
}

// ── VU Meter ──────────────────────────────────────────────────
function VUMeter({level=0,height=24,vertical=false}){const segs=12,active=Math.round((level/100)*segs);
  const c=i=>i>=10?T.red:i>=8?"#E8C030":T.green;
  if(vertical)return(<div style={{display:"flex",flexDirection:"column-reverse",gap:1,height,alignItems:"center"}}>
    {Array.from({length:segs}).map((_,i)=>(<div key={i} style={{width:4,height:(height-segs)/segs,borderRadius:1,background:i<active?c(i):T.border,boxShadow:i<active?`0 0 4px ${c(i)}`:"none",transition:"background .05s"}}/>))}</div>);
  return(<div style={{display:"flex",gap:2,height:6,alignItems:"center",width:height}}>
    {Array.from({length:segs}).map((_,i)=>(<div key={i} style={{flex:1,height:"100%",borderRadius:1,background:i<active?c(i):T.border,transition:"background .05s"}}/>))}</div>);
}

// ── Captures Screen ──────────────────────────────────────────
function CapturesScreen({onClose}){
  const[tab,setTab]=useState("models");const[query,setQuery]=useState("");
  const[results,setResults]=useState(null);const[models,setModels]=useState([]);const[loading,setLoading]=useState(false);
  useEffect(()=>{API.listModels().then(d=>setModels(d.models||[])).catch(()=>{});},[]);
  const doSearch=async()=>{if(!query.trim())return;setLoading(true);try{const data=tab==="models"?await API.searchModels(query):await API.searchIrs(query);setResults(data.results||[]);}catch{setResults([]);}setLoading(false);};
  const install=async(item)=>{try{if(tab==="models"){await API.installModel(item.download_url,item.name);}else{await API.installIr(item.download_url,item.name);}API.listModels().then(d=>setModels(d.models||[])).catch(()=>{});}catch(e){alert("Install failed: "+e.message);}};
  return(<div style={{display:"flex",flexDirection:"column",height:"100%",background:T.bg}}>
    <div className="screen-header"><div className="screen-title">Downloads</div><button className="btn-icon" style={{width:28,height:28,fontSize:13}}onClick={onClose}>✕</button></div>
    <div style={{padding:"6px 12px",borderBottom:`1px solid ${T.border}`}}><div className="toggle">
      <button className={`toggle-btn ${tab==="models"?"active":""}`}onClick={()=>setTab("models")}>NAM Models</button>
      <button className={`toggle-btn ${tab==="irs"?"active":""}`}onClick={()=>setTab("irs")}>IR Cabs</button></div></div>
    <div style={{padding:"6px 12px",display:"flex",gap:6,borderBottom:`1px solid ${T.border}`}}>
      <div style={{flex:1,display:"flex",background:T.surface,borderRadius:6,border:`1px solid ${T.border}`,padding:"6px 10px",gap:6,alignItems:"center"}}>
        <span style={{color:T.textDim,fontSize:11}}>🔍</span>
        <input placeholder={`Search ${tab==="models"?"NAM models":"IR cabs"}...`}value={query}onChange={e=>setQuery(e.target.value)}onKeyDown={e=>e.key==="Enter"&&doSearch()}style={{flex:1,background:"none",border:"none",color:T.textPrimary,fontSize:12,outline:"none"}}/></div>
      <button className="btn btn-primary"style={{padding:"6px 11px",fontSize:11}}onClick={doSearch}>{loading?"...":"Search"}</button></div>
    <div className="screen-body">
      {results===null&&models.length>0&&(<><div className="section-label">Installed Models</div>
        {models.map((m,i)=>(<div key={i}className="preset-row"style={{cursor:"default"}}>
          <div style={{width:26,height:26,borderRadius:5,display:"flex",alignItems:"center",justifyContent:"center",fontSize:11,background:m.loaded?`${T.green}22`:T.surface,color:m.loaded?T.green:T.textDim}}>🎛</div>
          <div style={{flex:1}}><div style={{fontSize:12,fontWeight:500}}>{m.name}</div><div className="mono"style={{fontSize:10,color:T.textDim}}>{m.architecture}·{m.size_mb}MB{m.loaded?"· CURRENT":""}</div></div></div>))}</>)}
      {results!==null&&results.length===0&&<div className="card-sm"style={{textAlign:"center",color:T.textDim,padding:20}}>No results found</div>}
      {results!==null&&results.map((r,i)=>(<div key={i}className="preset-row"style={{cursor:"default"}}>
        <div style={{flex:1}}><div style={{fontSize:12,fontWeight:500}}>{r.name}</div><div className="mono"style={{fontSize:10,color:T.textDim}}>{r.author}·{r.size_display}</div></div>
        <button className="btn btn-ghost"style={{padding:"4px 9px",fontSize:11}}onClick={()=>install(r)}>Get</button></div>))}</div></div>);
}

// ── MOCK DATA (used when pedal not connected) ────────────────
const MOCK_BLOCKS=[
  {id:"gate",type:"gate",name:"Noise Gate",bypassed:false,params:{threshold:40,release:25}},
  {id:"comp",type:"compressor",name:"Compressor",bypassed:false,params:{threshold:50,ratio:4,gain:50}},
  {id:"amp",type:"nam",name:"Twin Reverb",bypassed:false,params:{level:75}},
  {id:"cab",type:"ir",name:"2x12 American",bypassed:false,params:{level:75}},
  {id:"eq",type:"eq",name:"EQ",bypassed:false,params:{low:0,mid:0,high:0,level:70}},
  {id:"reverb",type:"reverb",name:"Hall Reverb",bypassed:false,params:{subtype:"hall",decay:50,mix:30,tone:50}},
];

const MOCK_PRESETS=[
  {num:1,bank:1,name:"Plexi Crunch"},{num:2,bank:1,name:"Blues Rock Lead"},
  {num:3,bank:1,name:"Deluxe Clean"},{num:4,bank:1,name:"British Drive"},
  {num:5,bank:2,name:"Metal Djent"},{num:6,bank:2,name:"Funky Wah"},
  {num:7,bank:2,name:"Ambient Pad"},{num:8,bank:2,name:"Shoegaze"},
];

// ── App Shell — Landscape Helix Stadium ───────────────────────
export default function App(){
  const[view,setView]=useState("main");
  const[state,setState]=useState({connected:false,master_volume:0.72,routing_mode:"mono",cpu_percent:0});
  const[blocks,setBlocks]=useState(MOCK_BLOCKS);
  const[selectedBlockId,setSelectedBlockId]=useState("gate");
  const[blockParams,setBlockParams]=useState({});
  const[paramView,setParamView]=useState("slider");
  const[vuLevel,setVuLevel]=useState(0);
  const[currentPreset,setCurrentPreset]=useState(1);
  const[currentBank,setCurrentBank]=useState(1);
  const[presets,setPresets]=useState(MOCK_PRESETS);
  const[globalBypass,setGlobalBypass]=useState(false);
  const[loadingPreset,setLoadingPreset]=useState(false);
  const[focusBlockId,setFocusBlockId]=useState(null);
  const[modelBrowserBlockId,setModelBrowserBlockId]=useState(null);
  const[footswitchMode,setFootswitchMode]=useState("stomp");

  // ── Undo/Redo ──
  const [undoStack, setUndoStack] = useState([]);
  const [redoStack, setRedoStack] = useState([]);
  const stateRef = useRef({ blocks: MOCK_BLOCKS, blockParams: {}, selectedBlockId: "gate" });
  const paramSnapRef = useRef(null);

  // Keep ref in sync
  useEffect(() => {
    stateRef.current = { blocks, blockParams, selectedBlockId };
  }, [blocks, blockParams, selectedBlockId]);

  // Take a full snapshot of blocks + params + selection
  const takeSnapshot = useCallback(() => {
    const s = stateRef.current;
    const snapshot = {
      blocks: s.blocks.map(b => ({ ...b, params: { ...b.params } })),
      blockParams: Object.fromEntries(
        Object.entries(s.blockParams).map(([k, v]) => [k, { ...v }])
      ),
      selectedBlockId: s.selectedBlockId,
    };
    setUndoStack(prev => [...prev.slice(-49), snapshot]);
    setRedoStack([]);
  }, []);

  // Debounced param snapshot (only on first change in a burst)
  const takeParamSnapshot = useCallback(() => {
    if (paramSnapRef.current) return; // already queued
    takeSnapshot();
    paramSnapRef.current = setTimeout(() => {
      paramSnapRef.current = null;
    }, 400);
  }, [takeSnapshot]);

  const handleUndo = useCallback(() => {
    setUndoStack(prev => {
      if (prev.length === 0) return prev;
      // Save current state to redo
      const current = stateRef.current;
      const snap = {
        blocks: current.blocks.map(b => ({ ...b, params: { ...b.params } })),
        blockParams: Object.fromEntries(
          Object.entries(current.blockParams).map(([k, v]) => [k, { ...v }])
        ),
        selectedBlockId: current.selectedBlockId,
      };
      setRedoStack(r => [...r, snap]);
      // Restore undo snapshot
      const restore = prev[prev.length - 1];
      setBlocks(restore.blocks);
      setBlockParams(restore.blockParams);
      setSelectedBlockId(restore.selectedBlockId);
      return prev.slice(0, -1);
    });
  }, []);

  const handleRedo = useCallback(() => {
    setRedoStack(prev => {
      if (prev.length === 0) return prev;
      // Save current state to undo
      const current = stateRef.current;
      const snap = {
        blocks: current.blocks.map(b => ({ ...b, params: { ...b.params } })),
        blockParams: Object.fromEntries(
          Object.entries(current.blockParams).map(([k, v]) => [k, { ...v }])
        ),
        selectedBlockId: current.selectedBlockId,
      };
      setUndoStack(u => [...u, snap]);
      // Restore redo snapshot
      const restore = prev[prev.length - 1];
      setBlocks(restore.blocks);
      setBlockParams(restore.blockParams);
      setSelectedBlockId(restore.selectedBlockId);
      return prev.slice(0, -1);
    });
  }, []);

  // ── Main Menu & Settings ──
  const [menuOpen, setMenuOpen] = useState(false);
  const [settingsView, setSettingsView] = useState(null); // "settings" | "eq" | null

  const handleMenuSelect = useCallback((itemId) => {
    setMenuOpen(false);
    switch (itemId) {
      case "settings": setSettingsView("settings"); break;
      case "eq":       setSettingsView("eq");       break;
      case "tuner":
        setState(prev => ({ ...prev, tuner_enabled: true }));
        API.tunerToggle(true).catch(() => {});
        break;
      default:
        // save, bypass, wifi — placeholder for now
        break;
    }
  }, []);

  // ── Poll pedal state from API ──
  const userChangedPreset = useRef(false);
  const userChangedBlock = useRef(false);

  const loadState=useCallback(async()=>{
    try{
      const s=await API.getState();
      setState(s);
      if(s.input_level!=null)setVuLevel(s.input_level);
      if(s.current_preset?.name&&!userChangedPreset.current){
        setCurrentPreset(s.current_preset.program!=null?s.current_preset.program+1:currentPreset);
      }
      // Only update blocks from API if user didn't just toggle/change them
      if(s.blocks&&s.blocks.length>0&&!userChangedBlock.current){
        setBlocks(s.blocks);
      }
    }catch{}
  },[currentPreset]);

  useEffect(()=>{loadState();const id=setInterval(loadState,3000);return()=>clearInterval(id);},[loadState]);

  // VU animation fallback when no real data
  useEffect(()=>{const id=setInterval(()=>{setVuLevel(p=>Math.max(0,Math.min(100,p+(Math.random()-0.45)*8)));},150);return()=>clearInterval(id);},[]);

  // ── Load presets from API ──
  useEffect(()=>{
    API.listPresets().then(data=>{
      if(data?.banks){
        const all=[];
        data.banks.forEach(b=>{(b.presets||[]).forEach((p,i)=>{if(p)all.push({num:i+1,bank:b.number+1,name:p.name,chain:p.chain});});});
        if(all.length>0)setPresets(all);
      }
    }).catch(()=>{});
  },[]);

  // ── Change preset ──
  const handleLoadPreset=useCallback(async(bank,program)=>{
    userChangedPreset.current = true;
    setLoadingPreset(true);
    try{
      // Activate on the backend first
      await API.activatePreset(bank,program);
      // Short delay for backend to apply
      await new Promise(r => setTimeout(r, 300));
      // Get updated state
      const s=await API.getState();
      setState(s);
      if(s.current_preset?.name){
        setCurrentPreset(s.current_preset.program!=null?s.current_preset.program+1:program+1);
      }
      // Get preset chain data and build blocks
      try{
        const p=await API.getPreset(bank,program);
        if(p?.chain&&p.chain.length>0){
          const newBlocks=p.chain.map((b,i)=>{
            const raw = { type: b.fx_type || "fx",
              enabled: b.enabled !== false, params: b.params || {},
              nam_model_path: b.nam_model_path, ir_file_path: b.ir_file_path,
            };
            return {
              id: b.id || `block_${b.fx_type || 'fx'}_${i}`,
              type: raw.type,
              name: getBlockDisplayName(raw),
              bypassed: !b.enabled,
              enabled: raw.enabled,
              params: raw.params,
              nam_model_path: raw.nam_model_path,
              ir_file_path: raw.ir_file_path,
            };
          });
          setBlocks(newBlocks);
          userChangedBlock.current = true;
        }
      }catch(e){console.warn("Could not fetch chain:",e);}
      setSelectedBlockId(null);
    }catch(e){console.warn("Preset activate failed:",e);}
    setLoadingPreset(false);
    // Re-enable polling sync after 5s
    setTimeout(() => { userChangedPreset.current = false; }, 5000);
    setTimeout(() => { userChangedBlock.current = false; }, 5000);
  },[]);

  const handlePresetClick=useCallback(async(num)=>{
    // Find the preset by number
    const p=presets.find(pr=>pr.num===num);
    if(!p)return;
    setCurrentPreset(num);
    await handleLoadPreset((p.bank||1)-1,num-1);
  },[presets,handleLoadPreset]);

  // ── Blocks ──
  const selectedBlock=useMemo(()=>blocks.find(b=>b.id===selectedBlockId),[blocks,selectedBlockId]);

  useEffect(()=>{
    if(selectedBlock&&blockParams[selectedBlockId]==null){
      const defs=getBlockParams(selectedBlock.type);const init={};
      defs.forEach(p=>{init[p.key]=(selectedBlock.params?.[p.key]!=null)?selectedBlock.params[p.key]:p.def;});
      setBlockParams(prev=>({...prev,[selectedBlockId]:init}));
    }
  },[selectedBlockId,selectedBlock,blockParams]);

  const handleSelectBlock=useCallback((id)=>{setSelectedBlockId(prev=>prev===id?null:id);},[]);
  const handleParamChange=useCallback((id,key,value)=>{
    takeParamSnapshot();
    setBlockParams(prev=>({...prev,[id]:{...(prev[id]||{}),[key]:value}}));
  },[takeParamSnapshot]);
  const handleToggleBlock=useCallback((id)=>{
    takeSnapshot();
    userChangedBlock.current=true;
    setBlocks(prev=>prev.map(b=>b.id===id?{...b,bypassed:!b.bypassed}:b));
    API.toggleBlock(id,false).catch(()=>{});
    setTimeout(()=>{userChangedBlock.current=false;},3000);
  },[takeSnapshot]);
  const handleParamChangeEnd=useCallback((id,key,value)=>{API.updateBlock(id,{[key]:value}).catch(()=>{});},[]);
  const handleReorder=useCallback((fromIdx,toIdx)=>{
    takeSnapshot();
    setBlocks(prev=>{const arr=[...prev];const[m]=arr.splice(fromIdx,1);arr.splice(toIdx,0,m);return arr;});
  },[takeSnapshot]);
  const handleAddBlock=useCallback(()=>{
    takeSnapshot();
    userChangedBlock.current=true;const id="block_"+Date.now();
    setBlocks(prev=>[...prev,{id,type:"overdrive",name:"New Drive",bypassed:false,params:{drive:30,tone:50,level:70}}]);
    setTimeout(()=>{userChangedBlock.current=false;},3000);
  },[takeSnapshot]);
  const handleRemoveBlock=useCallback((id)=>{
    takeSnapshot();
    userChangedBlock.current=true;
    setBlocks(prev=>prev.filter(b=>b.id!==id));
    if(selectedBlockId===id)setSelectedBlockId(null);
    setTimeout(()=>{userChangedBlock.current=false;},3000);
  },[takeSnapshot,selectedBlockId]);

  // ── Bank navigation ──
  const currentBankPresets=useMemo(()=>presets.filter(p=>p.bank===currentBank),[presets,currentBank]);
  const bankLetter=String.fromCharCode(64+currentBank);

  const handleBankUp=useCallback(()=>{
    const next=Math.min(currentBank+1,8);
    setCurrentBank(next);
    const bp=presets.filter(p=>p.bank===next);
    if(bp.length>0)handleLoadPreset(bp[0].bank-1,bp[0].num-1);
  },[currentBank,presets,handleLoadPreset]);

  const handleBankDown=useCallback(()=>{
    const next=Math.max(currentBank-1,1);
    setCurrentBank(next);
    const bp=presets.filter(p=>p.bank===next);
    if(bp.length>0)handleLoadPreset(bp[0].bank-1,bp[0].num-1);
  },[currentBank,presets,handleLoadPreset]);

  const handleGlobalBypass=useCallback(()=>{
    setGlobalBypass(p=>!p);
    API.bypassToggle().catch(()=>{});
  },[]);

  // ── Tuner toggle ──
  const handleTunerToggle=useCallback(()=>{
    const newState = !state.tuner_enabled;
    setState(prev=>({...prev, tuner_enabled: newState}));
    API.tunerToggle(newState).catch(()=>{});
    if (newState) {
      setView("main"); // Return to main view when enabling tuner (or keep current)
    }
  },[state.tuner_enabled]);

  // ── Focus View handlers ──
  const handleFocusViewBypass=useCallback(()=>{
    userChangedBlock.current=true;
    const id=focusBlockId;
    if(!id)return;
    setBlocks(prev=>prev.map(b=>b.id===id?{...b,bypassed:!b.bypassed}:b));
    API.toggleBlock(id,false).catch(()=>{});
    setTimeout(()=>{userChangedBlock.current=false;},3000);
  },[focusBlockId]);

  const handleOpenModelBrowser=useCallback((blockId)=>{
    setModelBrowserBlockId(blockId);
    if(focusBlockId) setFocusBlockId(null);
  },[focusBlockId]);

  const handleSelectModel=useCallback(({type, name, modelPath, isBuiltin})=>{
    const id=modelBrowserBlockId;
    if(!id)return;
    takeSnapshot();
    userChangedBlock.current=true;
    setBlocks(prev=>prev.map(b=>{
      if(b.id!==id)return b;
      const defs=getBlockParams(type);
      const init={};
      defs.forEach(p=>{init[p.key]=p.def;});
      return {
        ...b,
        type,
        name: name || getBlockDisplayName({type}),
        params: init,
        nam_model_path: (!isBuiltin && modelPath && type==='nam') ? modelPath : undefined,
        ir_file_path: (!isBuiltin && modelPath && type==='ir') ? modelPath : undefined,
      };
    }));
    setModelBrowserBlockId(null);
    setBlockParams(prev=>{
      const next={...prev};
      delete next[id];
      return next;
    });
    setTimeout(()=>{userChangedBlock.current=false;},3000);
  },[modelBrowserBlockId,takeSnapshot]);

  // ── Render ──
  return(
    <><style>{css}</style>
    <div style={{width:"100%",height:"100vh",display:"flex",flexDirection:"column",background:T.bg,overflow:"hidden",
      fontFamily:"'Inter',sans-serif",margin:"0 auto",
      maxWidth:980,
    }}>

      {view==="main"&&(
        <>
          {/* ══════ STATUS BAR ══════ */}
          <div style={{display:"flex",justifyContent:"space-between",alignItems:"center",
            padding:"4px 12px",background:T.panel,borderBottom:`1px solid ${T.border}`,flexShrink:0,minHeight:32}}>
            <div style={{display:"flex",gap:8,alignItems:"center"}}>
              <div style={{width:6,height:6,borderRadius:"50%",
                background:state.connected?T.green:T.red,boxShadow:`0 0 6px ${state.connected?T.green:T.red}`}}/>
              <span className="mono" style={{fontSize:9,color:T.textSec}}>{state.connected?"CONNECTED":"OFFLINE"}</span>
              {/* Undo/Redo */}
              <button className="btn-icon" style={{width:20,height:20,fontSize:11,opacity:undoStack.length>0?1:0.3}}
                onClick={handleUndo} disabled={undoStack.length===0} title="Undo (Ctrl+Z)">
                ↶
              </button>
              <button className="btn-icon" style={{width:20,height:20,fontSize:11,opacity:redoStack.length>0?1:0.3}}
                onClick={handleRedo} disabled={redoStack.length===0} title="Redo (Ctrl+Shift+Z)">
                ↷
              </button>
              <div style={{width:1,height:12,background:T.border}}/>
              <span className="mono" style={{fontSize:10,color:T.textPrimary,fontWeight:600}}>
                {state.current_preset?.name||(presets.find(p=>p.num===currentPreset)?.name||"—")}
              </span>
              {loadingPreset&&<span className="mono" style={{fontSize:8,color:T.amber}}>⟳</span>}
            </div>
            <div style={{display:"flex",gap:8,alignItems:"center"}}>
              <div style={{display:"flex",gap:8,alignItems:"center"}}>
                <VUMeter level={vuLevel} height={24}/>
                <span className="mono" style={{fontSize:9,color:T.textDim}}>CPU {state.cpu_percent!=null?`${state.cpu_percent}%`:"—"}</span>
              </div>
              <div style={{width:1,height:12,background:T.border}}/>
              <button className="btn-icon" style={{width:24,height:24,position:'relative'}}onClick={()=>setView("captures")}title="Downloads">
                <img src={`${import.meta.env.BASE_URL}img/ic_bank.svg`} alt="captures" style={{width:14,height:14,filter:'invert(1) brightness(2)'}}/>
              </button>
              <button className="btn-icon" style={{width:24,height:24,position:'relative'}}onClick={()=>setView("presets")}title="Presets">
                <img src={`${import.meta.env.BASE_URL}img/ic_presets.svg`} alt="presets" style={{width:14,height:14,filter:'invert(1) brightness(2)'}}/>
              </button>
              <div style={{display:"flex",gap:2,alignItems:"center",background:T.surface,borderRadius:4,border:`1px solid ${T.border}`,padding:2,height:24}}>
                {["stomp","preset"].map(m=>(<button key={m} onClick={()=>setFootswitchMode(m)} style={{
                  padding:"1px 5px",borderRadius:3,border:"none",height:20,
                  fontSize:8,fontWeight:700,letterSpacing:".04em",textTransform:"uppercase",
                  background:footswitchMode===m?T.amber:"transparent",
                  color:footswitchMode===m?"#000":T.textDim,
                  cursor:"pointer",lineHeight:1.5,minWidth:34,display:"flex",alignItems:"center",justifyContent:"center",
                }}>{m==="stomp"?"SM":"PR"}</button>))}
              </div>
              <button className="btn-icon" style={{width:24,height:24,position:'relative',
                background:state.tuner_enabled?'rgba(128,208,160,.15)':T.surface,
                borderColor:state.tuner_enabled?T.green:T.border}}
                onClick={handleTunerToggle} title={state.tuner_enabled?"Exit Tuner":"Tuner"}>
                <img src={`${import.meta.env.BASE_URL}img/fx_analyzer.svg`} alt="tuner" style={{width:14,height:14,filter:state.tuner_enabled?'invert(0.9) brightness(2) sepia(0.4) hue-rotate(80deg)':'invert(1) brightness(2)'}}/>
              </button>
              <button className="btn-icon" style={{width:24,height:24,position:'relative',background:'rgba(232,160,48,.12)',borderColor:T.amber}}onClick={()=>{if(!document.fullscreenElement){document.documentElement.requestFullscreen()}else{document.exitFullscreen()}}}title="Fullscreen">
                <svg viewBox="0 0 24 24" width="14" height="14" fill="#E8A030">
                  <path d="M7 14H5v5h5v-2H7v-3zm-2-4h2V7h3V5H5v5zm12 7h-3v2h5v-5h-2v3zM14 5v2h3v3h2V5h-5z"/>
                </svg>
              </button>
              <div style={{width:1,height:16,background:T.border}}/>
              <button className="btn-icon" style={{width:24,height:24,position:'relative'}}
                onClick={()=>setMenuOpen(true)} title="Main Menu">
                <span style={{fontSize:14,color:T.textSec,lineHeight:1}}>☰</span>
              </button>
            </div>
          </div>

          {/* ══════ MAIN AREA: Preset sidebar + Content ══════ */}
          <div style={{flex:1,display:"flex",overflow:"hidden"}}>

            {/* ─── Preset Sidebar ─── */}
            <div style={{width:90,flexShrink:0,background:T.surface,borderRight:`1px solid ${T.border}`,
              display:"flex",flexDirection:"column",overflow:"hidden"}}>
              {/* Bank header */}
              <div style={{padding:"6px 8px",textAlign:"center",borderBottom:`1px solid ${T.border}`,background:T.panel}}>
                <div className="mono" style={{fontSize:14,fontWeight:700,color:T.amber}}>Bank {bankLetter}</div>
                <div style={{fontSize:9,color:T.textDim,letterSpacing:".06em",textTransform:"uppercase"}}>Programs</div>
              </div>
              {/* Preset list */}
              <div style={{flex:1,overflowY:"auto",padding:"4px 6px",display:"flex",flexDirection:"column",gap:3}}>
                {currentBankPresets.map(p=>(
                  <div key={p.num}
                    className={`preset-chip-s ${p.num===currentPreset?"active":""}`}
                    onClick={()=>handlePresetClick(p.num)}>
                    <div className="pcs-num">0{p.num}</div>
                    <div className="pcs-name">{p.name}</div>
                    <div className="pcs-indicator" style={{background:p.num===currentPreset?T.amber:T.border}}/>
                  </div>
                ))}
              </div>
            </div>

            {/* ─── Main Content Area ─── */}
            <div style={{flex:1,display:"flex",flexDirection:"column",overflow:"hidden",minWidth:0}}>

              {/* Scribble info bar */}
              <div style={{display:"flex",gap:4,padding:"3px 8px",background:T.surface,borderBottom:`1px solid ${T.border}`,flexShrink:0}}>
                {[
                  {label:"Preset",value:presets.find(p=>p.num===currentPreset)?.name||"—"},
                  {label:"Routing",value:(state.routing_mode||"MONO").toUpperCase()},
                  {label:"Volume",value:state.master_volume!=null?`${Math.round(state.master_volume*100)}%`:"—"},
                  {label:"Bank",value:bankLetter},
                ].map(s=>(
                  <div key={s.label} style={{flex:1,textAlign:"center",padding:"2px 6px",borderRadius:3,background:T.panel,border:`1px solid ${T.border}`}}>
                    <div style={{fontSize:7,color:T.textDim,letterSpacing:".06em",textTransform:"uppercase"}}>{s.label}</div>
                    <div className="mono" style={{fontSize:10,fontWeight:600,color:T.amber,marginTop:1}}>{s.value}</div>
                  </div>
                ))}
              </div>

              {/* Block Chain */}
              <div style={{flex:selectedBlock?"0 0 auto":1,overflow:"hidden"}}>
                <BlockChain
                  blocks={blocks}
                  selectedBlockId={selectedBlockId}
                  onSelectBlock={handleSelectBlock}
                  onToggleBlock={handleToggleBlock}
                  onReorder={handleReorder}
                  onAddBlock={handleAddBlock}
                  onRemoveBlock={handleRemoveBlock}
                  onModelBrowser={handleOpenModelBrowser}
                />
              </div>

              {/* Parameter Panel or placeholder */}
              {selectedBlock&&blockParams[selectedBlockId]?(
                <ParameterPanel
                  block={selectedBlock}
                  params={blockParams[selectedBlockId]||{}}
                  viewMode={paramView}
                  onToggleView={()=>setParamView(p=>p==='slider'?'knob':'slider')}
                  onParamChange={(key,value)=>handleParamChange(selectedBlockId,key,value)}
                  onParamChangeEnd={(key,value)=>handleParamChangeEnd(selectedBlockId,key,value)}
                  onFocus={()=>setFocusBlockId(selectedBlockId)}
                  onModelBrowser={handleOpenModelBrowser}
                />
              ):(
                <div style={{flex:1,display:"flex",alignItems:"center",justifyContent:"center",background:T.bg,color:T.textDim,fontSize:11}}>
                  Tap a block to edit parameters
                </div>
              )}
            </div>
          </div>

          {/* ══════ FOOTSWITCH BAR ══════ */}
          <FootswitchBar
            mode={footswitchMode}
            blocks={blocks}
            selectedBlockId={selectedBlockId}
            currentBank={bankLetter}
            currentPreset={currentPreset}
            presets={currentBankPresets}
            onSelectBlock={handleSelectBlock}
            onToggleBlock={handleToggleBlock}
            onBankUp={handleBankUp}
            onBankDown={handleBankDown}
            onGlobalBypass={handleGlobalBypass}
            globalBypass={globalBypass}
            onTunerToggle={handleTunerToggle}
            tunerEnabled={state.tuner_enabled}
            onPresetClick={(idx)=>{const p=currentBankPresets[parseInt(idx)];if(p)handleLoadPreset(p.bank,p.num-1);}}
          />
        </>
      )}

      {/* ── Focus View overlay ── */}
      {focusBlockId&&blocks.find(b=>b.id===focusBlockId)&&blockParams[focusBlockId]&&(
        <FocusView
          block={blocks.find(b=>b.id===focusBlockId)}
          params={blockParams[focusBlockId]||{}}
          viewMode={paramView}
          onClose={()=>setFocusBlockId(null)}
          onParamChange={(key,value)=>handleParamChange(focusBlockId,key,value)}
          onParamChangeEnd={(key,value)=>handleParamChangeEnd(focusBlockId,key,value)}
          onToggleView={()=>setParamView(p=>p==='slider'?'knob':'slider')}
          onToggleBypass={handleFocusViewBypass}
          onOpenModelBrowser={()=>handleOpenModelBrowser(focusBlockId)}
        />
      )}
      {/* ── Overlays ── */}
      {view==="captures"&&<CapturesScreen onClose={()=>setView("main")}/>}
      {view==="presets"&&(
        <div style={{display:"flex",flexDirection:"column",height:"100%",background:T.bg}}>
          <div className="screen-header"><div className="screen-title">Presets</div><button className="btn-icon"style={{width:28,height:28,fontSize:13}}onClick={()=>setView("main")}>✕</button></div>
          <div className="screen-body">
            {presets.map((p,i)=>(
              <div key={i} className={`preset-row ${p.num===currentPreset?"active":""}`}
                onClick={()=>{handlePresetClick(p.num);setView("main");}}>
                <div className="mono" style={{width:26,height:26,borderRadius:5,display:"flex",alignItems:"center",justifyContent:"center",fontSize:11,fontWeight:700,
                  background:p.num===currentPreset?`${T.amber}22`:T.surface,color:p.num===currentPreset?T.amber:T.textDim,
                  border:`1px solid ${p.num===currentPreset?T.amber+"60":T.border}`}}>{p.num}</div>
                <div style={{flex:1}}><div style={{fontSize:12,fontWeight:600}}>{p.name}</div><div className="mono"style={{fontSize:9,color:T.textDim}}>Bank {p.bank||1}·Program {p.num-1}</div></div>
                {p.num===currentPreset&&<span style={{color:T.amber,fontSize:16}}>●</span>}
              </div>
            ))}
          </div>
        </div>
      )}

      {/* ── Tuner overlay ── */}
      {state.tuner_enabled&&(
        <TunerScreen
          tunerData={state}
          connected={state.connected}
          onExit={()=>{
            setState(prev=>({...prev, tuner_enabled: false}));
            API.tunerToggle(false).catch(()=>{});
          }}
        />
      )}

      {/* ── Model Browser ── */}
      {modelBrowserBlockId&&(()=>{
        const block=blocks.find(b=>b.id===modelBrowserBlockId);
        if(!block)return null;
        return (
          <ModelBrowser
            currentBlockType={block.type}
            currentBlockName={block.name}
            currentModelPath={block.nam_model_path||block.ir_file_path}
            onSelectModel={handleSelectModel}
            onClose={()=>setModelBrowserBlockId(null)}
          />
        );
      })()}

      {/* ── Main Menu ── */}
      {menuOpen&&(
        <MainMenu
          onClose={()=>setMenuOpen(false)}
          onItemSelect={handleMenuSelect}
        />
      )}

      {/* ── Global Settings ── */}
      {settingsView==="settings"&&(
        <GlobalSettings
          onClose={()=>setSettingsView(null)}
          onMasterVolume={(v)=>API.masterVolume(v).catch(()=>{})}
          onAudioProfile={(rate, period)=>API.setAudioProfile(rate, period).catch(()=>{})}
          onRoutingChange={(mode, bp)=>API.setRouting(mode, bp).catch(()=>{})}
          onSaveSettings={(s)=>API.saveSettings(s).catch(()=>{})}
        />
      )}

      {/* ── Global EQ ── */}
      {settingsView==="eq"&&(
        <GlobalEQ
          onClose={()=>setSettingsView(null)}
        />
      )}

    </div></>
  );
}
