Frontend first draft

frontend/pweb/lib/utils/error/handler.dart

@@ -0,0 +1,66 @@
+import 'package:flutter/material.dart';
+
+import 'package:pshared/api/responses/error/connectivity.dart';
+import 'package:pshared/api/responses/error/server.dart';
+import 'package:pshared/config/constants.dart';
+
+import 'package:pweb/generated/i18n/app_localizations.dart';
+
+
+class ErrorHandler {
+  /// A mapping of server-side error codes to localized user-friendly messages.
+  /// Update these keys to match the 'ErrorResponse.Error' field in your Go code.
+  static Map<String, String> getErrorMessagesLocs(AppLocalizations locs) {
+    return {
+      'account_not_verified': locs.errorAccountNotVerified,
+      'unauthorized': locs.errorLoginUnauthorized,
+      'verification_token_not_found': locs.errorVerificationTokenNotFound,
+      'internal_error': locs.errorInternalError,
+
+      'data_conflict': locs.errorDataConflict,
+      'access_denied': locs.errorAccessDenied,
+      'broken_payload': locs.errorBrokenPayload,
+      'invalid_argument': locs.errorInvalidArgument,
+      'broken_reference': locs.errorBrokenReference,
+      'invalid_query_parameter': locs.errorInvalidQueryParameter,
+      'not_implemented': locs.errorNotImplemented,
+      'license_required': locs.errorLicenseRequired,
+      'not_found': locs.errorNotFound,
+      'name_missing': locs.errorNameMissing,
+      'email_missing': locs.errorEmailMissing,
+      'password_missing': locs.errorPasswordMissing,
+      'email_not_registered': locs.errorEmailNotRegistered,
+      'duplicate_email': locs.errorDuplicateEmail,
+     };
+  }
+
+  static Map<String, String> getErrorMessages(BuildContext context) {
+    return getErrorMessagesLocs(AppLocalizations.of(context)!);
+  }
+
+  /// Determine which handler to use based on the runtime type of [e].
+  /// If no match is found, just return the error’s string representation.
+  static String handleError(BuildContext context, Object e) {
+    return handleErrorLocs(AppLocalizations.of(context)!, e);
+  }
+
+  static String handleErrorLocs(AppLocalizations locs, Object e) {
+    final errorHandlers = <Type, String Function(Object)>{
+      ErrorResponse: (ex) => _handleErrorResponseLocs(locs, ex as ErrorResponse),
+      ConnectivityError: (ex) => _handleConnectivityErrorLocs(locs, ex as ConnectivityError),
+    };
+
+    return errorHandlers[e.runtimeType]?.call(e) ?? e.toString();
+  }
+
+  static String _handleErrorResponseLocs(AppLocalizations locs, ErrorResponse e) {
+    final errorMessages = getErrorMessagesLocs(locs);
+    // Return the localized message if we recognize the error key, else use the raw details
+    return errorMessages[e.error] ?? e.details;
+  }
+
+  /// Handler for connectivity issues.
+  static String _handleConnectivityErrorLocs(AppLocalizations locs, ConnectivityError e) {
+    return locs.connectivityError(Constants.serviceUrl);
+  }
+}