feat: strategy builder

frontend/src/hooks/useApi.ts

@@ -265,7 +265,7 @@ export const useBacktestSymbols = () =>
     staleTime: 60_000,
   })
 
-export type BacktestLegPreset = { option_type: 'call' | 'put'; position: 'long' | 'short'; quantity: number; strike_pct: number; expiry: 'near' | 'far' }
+export type BacktestLegPreset = { option_type: 'call' | 'put' | 'stock'; position: 'long' | 'short'; quantity: number; strike_pct: number; expiry: 'near' | 'far' }
 export type BacktestStrategyInfo = { key: string; label: string; n_legs: number; default_legs: BacktestLegPreset[] }
 export const useBacktestStrategies = () =>
   useQuery<BacktestStrategyInfo[]>({
@@ -1763,7 +1763,7 @@ export type StrategyLeg = {
   expiry_date: string
   days_to_expiry: number
   strike: number
-  option_type: 'call' | 'put'
+  option_type: 'call' | 'put' | 'stock'
   position: 'long' | 'short'
   quantity: number
 }
@@ -1840,6 +1840,22 @@ export const usePriceStrategy = () =>
       api.post<PriceCombo>('/strategy-builder/price', body).then(r => r.data),
   })
 
+// The 28-strategy catalog (services.backtest_strategies.STRATEGIES) built from the REAL
+// current chain — real strikes/expiries, ready to price or replay as-is. A strategy that
+// can't be built right now (e.g. calendar/diagonal with only one real expiry available)
+// is simply absent from the response.
+export type StrategyPreset = { key: string; label: string; n_legs: number; legs: StrategyLeg[] }
+export const usePresets = (symbol: string, horizonDays: number, enabled: boolean, dteMin?: number | null, dteMax?: number | null) =>
+  useQuery<StrategyPreset[]>({
+    queryKey: ['strategy-builder-presets', symbol, horizonDays, dteMin, dteMax],
+    queryFn: () => api.get('/strategy-builder/presets', {
+      params: { symbol, horizon_days: horizonDays, dte_min: dteMin ?? undefined, dte_max: dteMax ?? undefined },
+    }).then(r => r.data),
+    enabled: enabled && !!symbol,
+    staleTime: 30_000,
+    retry: 1,
+  })
+
 export type OptimizeConstraints = {
   max_legs: number
   delta_threshold: number | null