frontend/src/components/DisplayMenu.jsx

import React from 'react';

// DisplayMenu — display preferences popover.
// Mirrors AnnotatorPanel chrome: ap-pop-backdrop + ap-settings panel.
// Controls four settings exposed to the user:
//   1. Palette (three swatch chips)
//   2. Body size (range slider)
//   3. Justify (checkbox)
//   4. Notes side (two chips: left / right)
//
// All other tweak fields (dropCaps, showScores) are preserved in the parent
// tweaks object but not exposed here.

export const PALETTES = [
  { label: 'Parchment', value: ['#f6f1e6', '#2b2418', '#9a3b20'] },
  { label: 'Ivory',     value: ['#fbf8f1', '#231f17', '#8a5a18'] },
  { label: 'Chalk',     value: ['#f3f2ee', '#22241f', '#3f5a96'] },
];

export default function DisplayMenu({ tweaks, onChange, onClose }) {
  const set = (patch) => onChange({ ...tweaks, ...patch });

  React.useEffect(() => {
    const onKey = (e) => { if (e.key === 'Escape') onClose(); };
    window.addEventListener('keydown', onKey);
    return () => window.removeEventListener('keydown', onKey);
  }, [onClose]);

  // Determine which palette is active by matching all three colour values.
  const activePalIdx = PALETTES.findIndex(
    (p) =>
      p.value[0] === tweaks.paperPalette[0] &&
      p.value[1] === tweaks.paperPalette[1] &&
      p.value[2] === tweaks.paperPalette[2],
  );

  return (
    <div>
      <div className="ap-pop-backdrop" onClick={onClose}></div>
      <div className="ap-settings" data-screen-label="Display settings">
        <div className="ap-settings-title">Display</div>
        <div className="ap-settings-sub">paper, type, and margin layout</div>

        {/* Palette */}
        <div className="ap-field">
          <label className="ap-field-label">Palette</label>
          <div className="ap-provider-row">
            {PALETTES.map((pal, i) => (
              <button
                key={pal.label}
                className={'ap-provider' + (activePalIdx === i ? ' is-active' : '')}
                onClick={() => set({ paperPalette: pal.value })}
                title={pal.value.join(' · ')}
                style={{
                  background: activePalIdx === i ? undefined : pal.value[0],
                  color: activePalIdx === i ? undefined : pal.value[1],
                  borderColor: activePalIdx === i ? undefined : pal.value[1] + '44',
                }}
              >
                {pal.label}
              </button>
            ))}
          </div>
        </div>

        {/* Body size */}
        <div className="ap-field">
          <label className="ap-field-label">
            Body size &mdash; {tweaks.bodySize}px
          </label>
          <input
            type="range"
            min={16}
            max={23}
            step={0.5}
            value={tweaks.bodySize}
            onChange={(e) => set({ bodySize: Number(e.target.value) })}
            style={{ width: '100%', marginTop: '6px' }}
          />
        </div>

        {/* Retrieved works */}
        <div className="ap-field">
          <label className="ap-field-label">
            Retrieved works &mdash; {tweaks.litCount ?? 3}
          </label>
          <input
            type="range"
            min={3}
            max={10}
            step={1}
            value={tweaks.litCount ?? 3}
            onChange={(e) => set({ litCount: Number(e.target.value) })}
            style={{ width: '100%', marginTop: '6px' }}
          />
        </div>

        {/* Justify */}
        <div className="ap-field">
          <label className="ap-field-label" style={{ display: 'flex', alignItems: 'center', gap: '8px', cursor: 'pointer' }}>
            <input
              type="checkbox"
              checked={tweaks.justify}
              onChange={(e) => set({ justify: e.target.checked })}
            />
            Justified text
          </label>
        </div>

        {/* Notes side */}
        <div className="ap-field">
          <label className="ap-field-label">Notes side</label>
          <div className="ap-provider-row">
            {['right', 'left'].map((side) => (
              <button
                key={side}
                className={'ap-provider' + (tweaks.notesSide === side ? ' is-active' : '')}
                onClick={() => set({ notesSide: side })}
              >
                {side}
              </button>
            ))}
          </div>
        </div>

        <div className="ap-settings-foot">
          <button className="ap-textbtn" onClick={onClose}>done</button>
        </div>
      </div>
    </div>
  );
}