pyr0ball
76516abd62
- Settings: add unit_system key (metric | imperial, default metric) - Recipe LLM prompts: inject unit instruction into L3 and L4 prompts so generated recipes use the user's preferred units throughout - Frontend: new utils/units.ts converter (mirrors Python units.py) - Inventory list: display quantities converted to preferred units - Settings view: metric/imperial toggle with save button - Settings store: load/save unit_system alongside cooking_equipment Closes #81
73 lines
2.1 KiB
TypeScript
73 lines
2.1 KiB
TypeScript
/**
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* Unit conversion utilities — mirrors app/utils/units.py.
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* Source of truth: metric (g, ml). Display conversion happens here.
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*/
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export type UnitSystem = 'metric' | 'imperial'
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// ── Conversion thresholds ─────────────────────────────────────────────────
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const IMPERIAL_MASS: [number, string, number][] = [
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[453.592, 'lb', 453.592],
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[0, 'oz', 28.3495],
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]
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const METRIC_MASS: [number, string, number][] = [
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[1000, 'kg', 1000],
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[0, 'g', 1],
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]
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const IMPERIAL_VOLUME: [number, string, number][] = [
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[3785.41, 'gal', 3785.41],
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[946.353, 'qt', 946.353],
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[473.176, 'pt', 473.176],
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[236.588, 'cup', 236.588],
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[0, 'fl oz', 29.5735],
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]
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const METRIC_VOLUME: [number, string, number][] = [
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[1000, 'l', 1000],
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[0, 'ml', 1],
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]
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// ── Public API ────────────────────────────────────────────────────────────
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/**
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* Convert a stored metric quantity to a display quantity + unit.
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* baseUnit must be 'g', 'ml', or 'each'.
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*/
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export function convertFromMetric(
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quantity: number,
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baseUnit: string,
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preferred: UnitSystem = 'metric',
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): [number, string] {
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if (baseUnit === 'each') return [quantity, 'each']
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const thresholds =
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baseUnit === 'g'
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? preferred === 'imperial' ? IMPERIAL_MASS : METRIC_MASS
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: baseUnit === 'ml'
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? preferred === 'imperial' ? IMPERIAL_VOLUME : METRIC_VOLUME
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: null
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if (!thresholds) return [Math.round(quantity * 100) / 100, baseUnit]
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for (const [min, unit, factor] of thresholds) {
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if (quantity >= min) {
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return [Math.round((quantity / factor) * 100) / 100, unit]
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}
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}
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return [Math.round(quantity * 100) / 100, baseUnit]
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}
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/** Format a quantity + unit for display, e.g. "1.5 kg" or "3.2 oz". */
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export function formatQuantity(
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quantity: number,
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baseUnit: string,
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preferred: UnitSystem = 'metric',
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): string {
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const [qty, unit] = convertFromMetric(quantity, baseUnit, preferred)
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if (unit === 'each') return `${qty}`
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return `${qty} ${unit}`
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}
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