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Unsafe JSON Decoding->the API returns a 500 error (HTML body) or network error, the app will crash. #154

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Unsafe JSON Decoding->the API returns a 500 error (HTML body) or network error, the app will crash. #154

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82ffbd5
try-catch-block
aniket866 Feb 7, 2026
a2f80aa
Code rabbit follow up
aniket866 Feb 7, 2026
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64 changes: 36 additions & 28 deletions lib/services/ai_service.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -301,7 +301,7 @@ class AIService {
}
}

// Add system message as the first message with role "model"
// Add system message
contents.add({
"role": "model",
"parts": [
Expand Down Expand Up @@ -389,40 +389,48 @@ class AIService {
);

if (response.statusCode == 200) {
final responseData = jsonDecode(response.body);

// Check if the response contains a function call
final candidates = responseData['candidates'] as List<dynamic>;
if (candidates.isNotEmpty) {
final content = candidates[0]['content'];
final parts = content['parts'] as List<dynamic>;
try {
// FIX: Added try-catch block for safe JSON decoding
final responseData = jsonDecode(response.body);

for (var part in parts) {
if (part.containsKey('functionCall')) {
final functionCall = part['functionCall'];
final functionName = functionCall['name'];
final arguments = functionCall['args'];

return {
'type': 'function_call',
'function_name': functionName,
'arguments': arguments,
'raw_response': jsonEncode(responseData),
};
// Check if the response contains a function call
final candidates = responseData['candidates'] as List<dynamic>;
if (candidates.isNotEmpty) {
final content = candidates[0]['content'];
final parts = content['parts'] as List<dynamic>;

for (var part in parts) {
if (part.containsKey('functionCall')) {
final functionCall = part['functionCall'];
final functionName = functionCall['name'];
final arguments = functionCall['args'];

return {
'type': 'function_call',
'function_name': functionName,
'arguments': arguments,
'raw_response': jsonEncode(responseData),
};
}
}
// If no function call is detected, return as regular message
return {
'type': 'message',
'content': parts[0]['text'] ?? '',
};
}

// If no function call is detected, return as regular message
return {
'type': 'message',
'content': candidates[0]['content']['parts'][0]['text'] ?? '',
'type': 'error',
'content': 'No response generated',
};
} catch (e) {
debugPrint('Error parsing AI response: $e');
return {
'type': 'error',
'content': 'Sorry, I received an invalid response from the AI server.',
};
}

return {
'type': 'error',
'content': 'No response generated',
};
} else {
debugPrint('Error from Gemini API: ${response.statusCode} ${response.body}');
return {
Expand Down