// tweaks-panel.jsx
// Reusable Tweaks shell + form-control helpers.
//
// Owns the host protocol (listens for __activate_edit_mode / __deactivate_edit_mode,
// posts __edit_mode_available / __edit_mode_set_keys / __edit_mode_dismissed) so
// individual prototypes don't re-roll it. Ships a consistent set of controls so you
// don't hand-draw <input type="range">, segmented radios, steppers, etc.
//
// Usage (in an HTML file that loads React + Babel):
//
//   const TWEAK_DEFAULTS = /*EDITMODE-BEGIN*/{
//     "primaryColor": "#D97757",
//     "fontSize": 16,
//     "density": "regular",
//     "dark": false
//   }/*EDITMODE-END*/;
//
//   function App() {
//     const [t, setTweak] = useTweaks(TWEAK_DEFAULTS);
//     return (
//       <div style={{ fontSize: t.fontSize, color: t.primaryColor }}>
//         Hello
//         <TweaksPanel>
//           <TweakSection label="Typography" />
//           <TweakSlider label="Font size" value={t.fontSize} min={10} max={32} unit="px"
//                        onChange={(v) => setTweak('fontSize', v)} />
//           <TweakRadio  label="Density" value={t.density}
//                        options={['compact', 'regular', 'comfy']}
//                        onChange={(v) => setTweak('density', v)} />
//           <TweakSection label="Theme" />
//           <TweakColor  label="Primary" value={t.primaryColor}
//                        onChange={(v) => setTweak('primaryColor', v)} />
//           <TweakToggle label="Dark mode" value={t.dark}
//                        onChange={(v) => setTweak('dark', v)} />
//         </TweaksPanel>
//       </div>
//     );
//   }
//
// ─────────────────────────────────────────────────────────────────────────────

const __TWEAKS_STYLE = `
  .twk-panel{position:fixed;right:16px;bottom:16px;z-index:2147483646;width:280px;
    max-height:calc(100vh - 32px);display:flex;flex-direction:column;
    background:rgba(250,249,247,.78);color:#29261b;
    -webkit-backdrop-filter:blur(24px) saturate(160%);backdrop-filter:blur(24px) saturate(160%);
    border:.5px solid rgba(255,255,255,.6);border-radius:14px;
    box-shadow:0 1px 0 rgba(255,255,255,.5) inset,0 12px 40px rgba(0,0,0,.18);
    font:11.5px/1.4 ui-sans-serif,system-ui,-apple-system,sans-serif;overflow:hidden}
  .twk-hd{display:flex;align-items:center;justify-content:space-between;
    padding:10px 8px 10px 14px;cursor:move;user-select:none}
  .twk-hd b{font-size:12px;font-weight:600;letter-spacing:.01em}
  .twk-x{appearance:none;border:0;background:transparent;color:rgba(41,38,27,.55);
    width:22px;height:22px;border-radius:6px;cursor:default;font-size:13px;line-height:1}
  .twk-x:hover{background:rgba(0,0,0,.06);color:#29261b}
  .twk-body{padding:2px 14px 14px;display:flex;flex-direction:column;gap:10px;
    overflow-y:auto;overflow-x:hidden;min-height:0;
    scrollbar-width:thin;scrollbar-color:rgba(0,0,0,.15) transparent}
  .twk-body::-webkit-scrollbar{width:8px}
  .twk-body::-webkit-scrollbar-track{background:transparent;margin:2px}
  .twk-body::-webkit-scrollbar-thumb{background:rgba(0,0,0,.15);border-radius:4px;
    border:2px solid transparent;background-clip:content-box}
  .twk-body::-webkit-scrollbar-thumb:hover{background:rgba(0,0,0,.25);
    border:2px solid transparent;background-clip:content-box}
  .twk-row{display:flex;flex-direction:column;gap:5px}
  .twk-row-h{flex-direction:row;align-items:center;justify-content:space-between;gap:10px}
  .twk-lbl{display:flex;justify-content:space-between;align-items:baseline;
    color:rgba(41,38,27,.72)}
  .twk-lbl>span:first-child{font-weight:500}
  .twk-val{color:rgba(41,38,27,.5);font-variant-numeric:tabular-nums}

  .twk-sect{font-size:10px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;
    color:rgba(41,38,27,.45);padding:10px 0 0}
  .twk-sect:first-child{padding-top:0}

  .twk-field{appearance:none;width:100%;height:26px;padding:0 8px;
    border:.5px solid rgba(0,0,0,.1);border-radius:7px;
    background:rgba(255,255,255,.6);color:inherit;font:inherit;outline:none}
  .twk-field:focus{border-color:rgba(0,0,0,.25);background:rgba(255,255,255,.85)}
  select.twk-field{padding-right:22px;
    background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'><path fill='rgba(0,0,0,.5)' d='M0 0h10L5 6z'/></svg>");
    background-repeat:no-repeat;background-position:right 8px center}

  .twk-slider{appearance:none;-webkit-appearance:none;width:100%;height:4px;margin:6px 0;
    border-radius:999px;background:rgba(0,0,0,.12);outline:none}
  .twk-slider::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;
    width:14px;height:14px;border-radius:50%;background:#fff;
    border:.5px solid rgba(0,0,0,.12);box-shadow:0 1px 3px rgba(0,0,0,.2);cursor:default}
  .twk-slider::-moz-range-thumb{width:14px;height:14px;border-radius:50%;
    background:#fff;border:.5px solid rgba(0,0,0,.12);box-shadow:0 1px 3px rgba(0,0,0,.2);cursor:default}

  .twk-seg{position:relative;display:flex;padding:2px;border-radius:8px;
    background:rgba(0,0,0,.06);user-select:none}
  .twk-seg-thumb{position:absolute;top:2px;bottom:2px;border-radius:6px;
    background:rgba(255,255,255,.9);box-shadow:0 1px 2px rgba(0,0,0,.12);
    transition:left .15s cubic-bezier(.3,.7,.4,1),width .15s}
  .twk-seg.dragging .twk-seg-thumb{transition:none}
  .twk-seg button{appearance:none;position:relative;z-index:1;flex:1;border:0;
    background:transparent;color:inherit;font:inherit;font-weight:500;height:22px;
    border-radius:6px;cursor:default;padding:0}

  .twk-toggle{position:relative;width:32px;height:18px;border:0;border-radius:999px;
    background:rgba(0,0,0,.15);transition:background .15s;cursor:default;padding:0}
  .twk-toggle[data-on="1"]{background:#34c759}
  .twk-toggle i{position:absolute;top:2px;left:2px;width:14px;height:14px;border-radius:50%;
    background:#fff;box-shadow:0 1px 2px rgba(0,0,0,.25);transition:transform .15s}
  .twk-toggle[data-on="1"] i{transform:translateX(14px)}

  .twk-num{display:flex;align-items:center;height:26px;padding:0 0 0 8px;
    border:.5px solid rgba(0,0,0,.1);border-radius:7px;background:rgba(255,255,255,.6)}
  .twk-num-lbl{font-weight:500;color:rgba(41,38,27,.6);cursor:ew-resize;
    user-select:none;padding-right:8px}
  .twk-num input{flex:1;min-width:0;height:100%;border:0;background:transparent;
    font:inherit;font-variant-numeric:tabular-nums;text-align:right;padding:0 8px 0 0;
    outline:none;color:inherit;-moz-appearance:textfield}
  .twk-num input::-webkit-inner-spin-button,.twk-num input::-webkit-outer-spin-button{
    -webkit-appearance:none;margin:0}
  .twk-num-unit{padding-right:8px;color:rgba(41,38,27,.45)}

  .twk-btn{appearance:none;height:26px;padding:0 12px;border:0;border-radius:7px;
    background:rgba(0,0,0,.78);color:#fff;font:inherit;font-weight:500;cursor:default}
  .twk-btn:hover{background:rgba(0,0,0,.88)}
  .twk-btn.secondary{background:rgba(0,0,0,.06);color:inherit}
  .twk-btn.secondary:hover{background:rgba(0,0,0,.1)}

  .twk-swatch{appearance:none;-webkit-appearance:none;width:56px;height:22px;
    border:.5px solid rgba(0,0,0,.1);border-radius:6px;padding:0;cursor:default;
    background:transparent;flex-shrink:0}
  .twk-swatch::-webkit-color-swatch-wrapper{padding:0}
  .twk-swatch::-webkit-color-swatch{border:0;border-radius:5.5px}
  .twk-swatch::-moz-color-swatch{border:0;border-radius:5.5px}
`;

// ── useTweaks ───────────────────────────────────────────────────────────────
// Single source of truth for tweak values. setTweak persists via the host
// (__edit_mode_set_keys → host rewrites the EDITMODE block on disk).
function useTweaks(defaults) {
  const [values, setValues] = React.useState(defaults);
  const setTweak = React.useCallback((key, val) => {
    setValues((prev) => ({ ...prev, [key]: val }));
    window.parent.postMessage({ type: '__edit_mode_set_keys', edits: { [key]: val } }, '*');
  }, []);
  return [values, setTweak];
}

// ── TweaksPanel ─────────────────────────────────────────────────────────────
// Floating shell. Registers the protocol listener BEFORE announcing
// availability — if the announce ran first, the host's activate could land
// before our handler exists and the toolbar toggle would silently no-op.
// The close button posts __edit_mode_dismissed so the host's toolbar toggle
// flips off in lockstep; the host echoes __deactivate_edit_mode back which
// is what actually hides the panel.
function TweaksPanel({ title = 'Tweaks', children }) {
  const [open, setOpen] = React.useState(false);
  const dragRef = React.useRef(null);
  const offsetRef = React.useRef({ x: 16, y: 16 });
  const PAD = 16;

  const clampToViewport = React.useCallback(() => {
    const panel = dragRef.current;
    if (!panel) return;
    const w = panel.offsetWidth, h = panel.offsetHeight;
    const maxRight = Math.max(PAD, window.innerWidth - w - PAD);
    const maxBottom = Math.max(PAD, window.innerHeight - h - PAD);
    offsetRef.current = {
      x: Math.min(maxRight, Math.max(PAD, offsetRef.current.x)),
      y: Math.min(maxBottom, Math.max(PAD, offsetRef.current.y)),
    };
    panel.style.right = offsetRef.current.x + 'px';
    panel.style.bottom = offsetRef.current.y + 'px';
  }, []);

  React.useEffect(() => {
    if (!open) return;
    clampToViewport();
    if (typeof ResizeObserver === 'undefined') {
      window.addEventListener('resize', clampToViewport);
      return () => window.removeEventListener('resize', clampToViewport);
    }
    const ro = new ResizeObserver(clampToViewport);
    ro.observe(document.documentElement);
    return () => ro.disconnect();
  }, [open, clampToViewport]);

  React.useEffect(() => {
    const onMsg = (e) => {
      const t = e?.data?.type;
      if (t === '__activate_edit_mode') setOpen(true);
      else if (t === '__deactivate_edit_mode') setOpen(false);
    };
    window.addEventListener('message', onMsg);
    window.parent.postMessage({ type: '__edit_mode_available' }, '*');
    return () => window.removeEventListener('message', onMsg);
  }, []);

  const dismiss = () => {
    setOpen(false);
    window.parent.postMessage({ type: '__edit_mode_dismissed' }, '*');
  };

  const onDragStart = (e) => {
    const panel = dragRef.current;
    if (!panel) return;
    const r = panel.getBoundingClientRect();
    const sx = e.clientX, sy = e.clientY;
    const startRight = window.innerWidth - r.right;
    const startBottom = window.innerHeight - r.bottom;
    const move = (ev) => {
      offsetRef.current = {
        x: startRight - (ev.clientX - sx),
        y: startBottom - (ev.clientY - sy),
      };
      clampToViewport();
    };
    const up = () => {
      window.removeEventListener('mousemove', move);
      window.removeEventListener('mouseup', up);
    };
    window.addEventListener('mousemove', move);
    window.addEventListener('mouseup', up);
  };

  if (!open) return null;
  return (
    <>
      <style>{__TWEAKS_STYLE}</style>
      <div ref={dragRef} className="twk-panel"
           style={{ right: offsetRef.current.x, bottom: offsetRef.current.y }}>
        <div className="twk-hd" onMouseDown={onDragStart}>
          <b>{title}</b>
          <button className="twk-x" aria-label="Close tweaks"
                  onMouseDown={(e) => e.stopPropagation()}
                  onClick={dismiss}>✕</button>
        </div>
        <div className="twk-body">{children}</div>
      </div>
    </>
  );
}

// ── Layout helpers ──────────────────────────────────────────────────────────

function TweakSection({ label, children }) {
  return (
    <>
      <div className="twk-sect">{label}</div>
      {children}
    </>
  );
}

function TweakRow({ label, value, children, inline = false }) {
  return (
    <div className={inline ? 'twk-row twk-row-h' : 'twk-row'}>
      <div className="twk-lbl">
        <span>{label}</span>
        {value != null && <span className="twk-val">{value}</span>}
      </div>
      {children}
    </div>
  );
}

// ── Controls ────────────────────────────────────────────────────────────────

function TweakSlider({ label, value, min = 0, max = 100, step = 1, unit = '', onChange }) {
  return (
    <TweakRow label={label} value={`${value}${unit}`}>
      <input type="range" className="twk-slider" min={min} max={max} step={step}
             value={value} onChange={(e) => onChange(Number(e.target.value))} />
    </TweakRow>
  );
}

function TweakToggle({ label, value, onChange }) {
  return (
    <div className="twk-row twk-row-h">
      <div className="twk-lbl"><span>{label}</span></div>
      <button type="button" className="twk-toggle" data-on={value ? '1' : '0'}
              role="switch" aria-checked={!!value}
              onClick={() => onChange(!value)}><i /></button>
    </div>
  );
}

function TweakRadio({ label, value, options, onChange }) {
  const trackRef = React.useRef(null);
  const [dragging, setDragging] = React.useState(false);
  const opts = options.map((o) => (typeof o === 'object' ? o : { value: o, label: o }));
  const idx = Math.max(0, opts.findIndex((o) => o.value === value));
  const n = opts.length;

  // The active value is read by pointer-move handlers attached for the lifetime
  // of a drag — ref it so a stale closure doesn't fire onChange for every move.
  const valueRef = React.useRef(value);
  valueRef.current = value;

  const segAt = (clientX) => {
    const r = trackRef.current.getBoundingClientRect();
    const inner = r.width - 4;
    const i = Math.floor(((clientX - r.left - 2) / inner) * n);
    return opts[Math.max(0, Math.min(n - 1, i))].value;
  };

  const onPointerDown = (e) => {
    setDragging(true);
    const v0 = segAt(e.clientX);
    if (v0 !== valueRef.current) onChange(v0);
    const move = (ev) => {
      if (!trackRef.current) return;
      const v = segAt(ev.clientX);
      if (v !== valueRef.current) onChange(v);
    };
    const up = () => {
      setDragging(false);
      window.removeEventListener('pointermove', move);
      window.removeEventListener('pointerup', up);
    };
    window.addEventListener('pointermove', move);
    window.addEventListener('pointerup', up);
  };

  return (
    <TweakRow label={label}>
      <div ref={trackRef} role="radiogroup" onPointerDown={onPointerDown}
           className={dragging ? 'twk-seg dragging' : 'twk-seg'}>
        <div className="twk-seg-thumb"
             style={{ left: `calc(2px + ${idx} * (100% - 4px) / ${n})`,
                      width: `calc((100% - 4px) / ${n})` }} />
        {opts.map((o) => (
          <button key={o.value} type="button" role="radio" aria-checked={o.value === value}>
            {o.label}
          </button>
        ))}
      </div>
    </TweakRow>
  );
}

function TweakSelect({ label, value, options, onChange }) {
  return (
    <TweakRow label={label}>
      <select className="twk-field" value={value} onChange={(e) => onChange(e.target.value)}>
        {options.map((o) => {
          const v = typeof o === 'object' ? o.value : o;
          const l = typeof o === 'object' ? o.label : o;
          return <option key={v} value={v}>{l}</option>;
        })}
      </select>
    </TweakRow>
  );
}

function TweakText({ label, value, placeholder, onChange }) {
  return (
    <TweakRow label={label}>
      <input className="twk-field" type="text" value={value} placeholder={placeholder}
             onChange={(e) => onChange(e.target.value)} />
    </TweakRow>
  );
}

function TweakNumber({ label, value, min, max, step = 1, unit = '', onChange }) {
  const clamp = (n) => {
    if (min != null && n < min) return min;
    if (max != null && n > max) return max;
    return n;
  };
  const startRef = React.useRef({ x: 0, val: 0 });
  const onScrubStart = (e) => {
    e.preventDefault();
    startRef.current = { x: e.clientX, val: value };
    const decimals = (String(step).split('.')[1] || '').length;
    const move = (ev) => {
      const dx = ev.clientX - startRef.current.x;
      const raw = startRef.current.val + dx * step;
      const snapped = Math.round(raw / step) * step;
      onChange(clamp(Number(snapped.toFixed(decimals))));
    };
    const up = () => {
      window.removeEventListener('pointermove', move);
      window.removeEventListener('pointerup', up);
    };
    window.addEventListener('pointermove', move);
    window.addEventListener('pointerup', up);
  };
  return (
    <div className="twk-num">
      <span className="twk-num-lbl" onPointerDown={onScrubStart}>{label}</span>
      <input type="number" value={value} min={min} max={max} step={step}
             onChange={(e) => onChange(clamp(Number(e.target.value)))} />
      {unit && <span className="twk-num-unit">{unit}</span>}
    </div>
  );
}

function TweakColor({ label, value, onChange }) {
  return (
    <div className="twk-row twk-row-h">
      <div className="twk-lbl"><span>{label}</span></div>
      <input type="color" className="twk-swatch" value={value}
             onChange={(e) => onChange(e.target.value)} />
    </div>
  );
}

function TweakButton({ label, onClick, secondary = false }) {
  return (
    <button type="button" className={secondary ? 'twk-btn secondary' : 'twk-btn'}
            onClick={onClick}>{label}</button>
  );
}

Object.assign(window, {
  useTweaks, TweaksPanel, TweakSection, TweakRow,
  TweakSlider, TweakToggle, TweakRadio, TweakSelect,
  TweakText, TweakNumber, TweakColor, TweakButton,
});