dennisthiessenandClaude Opus 4.8
1951531453
Risk-based sizing on each setup card: shares = floor((account × risk%) / |entry − stop|), with position value and dollars-at-risk. Account size and per-trade risk % are editable inline and persisted in localStorage. Flags when a position would exceed the account (needs margin). Frontend-only. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
38 lines
968 B
TypeScript
38 lines
968 B
TypeScript
import { useCallback, useEffect, useState } from 'react';
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export interface RiskSettings {
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accountSize: number;
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riskPct: number;
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}
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const STORAGE_KEY = 'risk-settings';
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const DEFAULTS: RiskSettings = { accountSize: 10000, riskPct: 1 };
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/** Account size + per-trade risk %, persisted in localStorage (per browser). */
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export function useRiskSettings() {
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const [settings, setSettings] = useState<RiskSettings>(() => {
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try {
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const raw = localStorage.getItem(STORAGE_KEY);
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if (raw) return { ...DEFAULTS, ...JSON.parse(raw) };
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} catch {
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/* ignore malformed storage */
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}
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return DEFAULTS;
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});
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useEffect(() => {
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try {
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localStorage.setItem(STORAGE_KEY, JSON.stringify(settings));
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} catch {
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/* ignore quota/availability errors */
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}
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}, [settings]);
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const update = useCallback(
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(patch: Partial<RiskSettings>) => setSettings((s) => ({ ...s, ...patch })),
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[],
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);
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return { settings, update };
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}
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