huge refactor on web-api and web-app

apps/web-api/src/utils/error-handler.ts

@@ -0,0 +1,64 @@
+import { Context } from 'hono';
+import { getLogger } from '@stock-bot/logger';
+import { ValidationError } from './validation';
+import { ApiResponse } from '../types/exchange.types';
+
+const logger = getLogger('error-handler');
+
+export function handleError(c: Context, error: unknown, operation: string): Response {
+  logger.error(`Failed ${operation}`, { error });
+
+  // Handle validation errors
+  if (error instanceof ValidationError) {
+    const response: ApiResponse = {
+      success: false,
+      error: error.message,
+    };
+    return c.json(response, 400);
+  }
+
+  // Handle database constraint violations
+  if (error instanceof Error && error.message.includes('duplicate key')) {
+    const response: ApiResponse = {
+      success: false,
+      error: 'Resource already exists with this unique identifier',
+    };
+    return c.json(response, 409);
+  }
+
+  // Handle not found errors
+  if (error instanceof Error && error.message.includes('not found')) {
+    const response: ApiResponse = {
+      success: false,
+      error: error.message,
+    };
+    return c.json(response, 404);
+  }
+
+  // Generic error response
+  const response: ApiResponse = {
+    success: false,
+    error: error instanceof Error ? error.message : 'Unknown error occurred',
+  };
+  return c.json(response, 500);
+}
+
+export function createSuccessResponse<T>(
+  data: T,
+  message?: string,
+  total?: number
+): ApiResponse<T> {
+  const response: ApiResponse<T> = {
+    success: true,
+    data,
+  };
+
+  if (message) {
+    response.message = message;
+  }
+  if (total !== undefined) {
+    response.total = total;
+  }
+
+  return response;
+}