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import { useState, useEffect } from 'react';
type FontSizePreset = 'small' | 'medium' | 'large';
interface FontSizeConfig {
size: FontSizePreset;
remValue: number;
}
const FONT_SIZE_PRESETS: Record<FontSizePreset, FontSizeConfig> = {
small: { size: 'small', remValue: 0.875 }, // 14px
medium: { size: 'medium', remValue: 1 }, // 16px (default)
large: { size: 'large', remValue: 1.125 }, // 18px
};
interface UseFontSize {
fontSize: FontSizePreset;
setFontSize: (size: FontSizePreset) => void;
isFontReady: boolean;
}
/**
* T006, T010: Font size persistence hook with localStorage
* Manages note content font size preference and applies CSS variable updates
*/
export function useFontSize(): UseFontSize {
const [fontSize, setFontSizeState] = useState<FontSizePreset>(() => {
// Load from localStorage, default to 'medium'
const saved = localStorage.getItem('note-font-size');
return (saved as FontSizePreset) || 'medium';
});
const [isFontReady, setIsFontReady] = useState(false);
// T010: Update CSS variable whenever fontSize changes
useEffect(() => {
const config = FONT_SIZE_PRESETS[fontSize];
const remValue = config.remValue;
// Update the CSS custom property on the root element
document.documentElement.style.setProperty('--content-font-size', `${remValue}rem`);
// Force synchronous style recalculation to prevent FOUC/flicker
document.documentElement.getBoundingClientRect();
// Persist to localStorage
localStorage.setItem('note-font-size', fontSize);
// Signal that font styles are applied and ready
setIsFontReady(true);
}, [fontSize]);
const setFontSize = (size: FontSizePreset) => {
setFontSizeState(size);
};
return { fontSize, setFontSize, isFontReady };
}
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