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backend/src/features/fuel-logs/api/fuel-logs.validators.ts

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+/**
+ * @ai-summary Input validation for fuel logs API
+ */
+
+import { z } from 'zod';
+
+export const createFuelLogSchema = z.object({
+  vehicleId: z.string().uuid(),
+  date: z.string().regex(/^\d{4}-\d{2}-\d{2}$/),
+  odometer: z.number().int().positive(),
+  gallons: z.number().positive(),
+  pricePerGallon: z.number().positive(),
+  totalCost: z.number().positive(),
+  station: z.string().max(200).optional(),
+  location: z.string().max(200).optional(),
+  notes: z.string().max(1000).optional(),
+});
+
+export const updateFuelLogSchema = z.object({
+  date: z.string().regex(/^\d{4}-\d{2}-\d{2}$/).optional(),
+  odometer: z.number().int().positive().optional(),
+  gallons: z.number().positive().optional(),
+  pricePerGallon: z.number().positive().optional(),
+  totalCost: z.number().positive().optional(),
+  station: z.string().max(200).optional(),
+  location: z.string().max(200).optional(),
+  notes: z.string().max(1000).optional(),
+}).refine(data => Object.keys(data).length > 0, {
+  message: 'At least one field must be provided for update'
+});
+
+export function validateCreateFuelLog(data: unknown) {
+  return createFuelLogSchema.safeParse(data);
+}
+
+export function validateUpdateFuelLog(data: unknown) {
+  return updateFuelLogSchema.safeParse(data);
+}