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Easy error handling for Flutter applications! Modern UI for errors, updated logging to keep you productive.

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# Error Stack for Flutter

[![pub package](https://img.shields.io/pub/v/error_stack.svg)](https://pub.dartlang.org/packages/error_stack)
[![License: MIT](https://img.shields.io/badge/license-MIT-purple.svg)](https://opensource.org/licenses/MIT)

Error Stack is a comprehensive error handling and debugging toolkit for Flutter. It provides beautiful error screens in debug mode with actionable information, customizable error pages for production, and a powerful dev panel for runtime debugging.

## Features

- Beautiful debug error screens with Google search links and stack traces
- Customizable production error pages
- Light and dark mode support
- **Dev Panel** - Runtime debugging tool with:
  - API request/response logging
  - Console logging with severity levels
  - Navigation route tracking
  - Local storage viewer (Secure Storage & Shared Preferences)
  - UI debugging overlays (grid, layout bounds, etc.)
- Dio interceptor for automatic HTTP logging
- SOLID architecture with dependency injection support

## Installation

Add the following to your `pubspec.yaml`:

```yaml
dependencies:
  error_stack: ^2.1.5
```

Or install via command line:

```bash
dart pub add error_stack
```

## Quick Start

### Basic Setup

```dart
import 'package:flutter/material.dart';
import 'package:error_stack/error_stack.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await ErrorStack.init();
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      builder: ErrorStack.builder, // Adds dev panel and UI debug overlays
      home: HomePage(),
    );
  }
}
```

### Nylo Integration

```dart
import 'package:error_stack/error_stack.dart';

class AppProvider {
  @override
  boot(Nylo nylo) async {
    nylo.useErrorStack();
  }
}
```

## Configuration

### Full Initialization Options

```dart
await ErrorStack.init(
  level: ErrorStackLogLevel.verbose,  // verbose | minimal
  initialRoute: '/',                   // Route for "Restart app" button
  forceDebugWidget: false,             // Show debug widget in release mode
  enableDevPanel: true,                // Enable/disable dev panel (default: debug mode only)
  devPanelConfig: DevPanelConfig(
    enableApiLogging: true,
    enableConsoleLogging: true,
    enableRouteTracking: true,
    apiLogLimit: 100,
    consoleLogLimit: 100,
    routeHistoryLimit: 50,
  ),
  errorWidget: (errorDetails) {        // Custom release mode error widget
    return Scaffold(
      body: Center(
        child: Text('Something went wrong'),
      ),
    );
  },
);
```

### Log Levels

- `ErrorStackLogLevel.verbose` (default) - Full stack trace and details
- `ErrorStackLogLevel.minimal` - Basic error information only

---

## Dev Panel

The Dev Panel is a runtime debugging tool accessible in debug mode. It provides 4 main tabs plus UI debugging tools.

### Setup

```dart
import 'package:error_stack/error_stack.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await ErrorStack.init();
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      navigatorObservers: [ErrorStackNavigatorObserver()], // Route tracking
      builder: ErrorStack.builder, // Dev panel bar and UI overlays
      home: HomePage(),
    );
  }
}
```

### Opening the Dev Panel

**Option 1:** Long-press the "Dev Mode" bar at the bottom of the screen

**Option 2:** Call programmatically:
```dart
ErrorStack.showDevPanel(context);
```

---

### API Tab

View HTTP requests and responses with timing, headers, and body data.

#### Dio Integration

```dart
import 'package:error_stack/error_stack_dio.dart';

final dio = Dio();
dio.interceptors.add(ErrorStackDioInterceptor());

// All requests are automatically logged
final response = await dio.get('https://api.example.com/users');
```

#### Manual API Logging

```dart
// Log a complete request
DevPanelStore.instance.logApi(
  method: 'GET',
  url: 'https://api.example.com/users',
  statusCode: 200,
  durationMs: 150,
  requestHeaders: {'Authorization': 'Bearer token'},
  responseBody: {'users': []},
);

// Or track pending requests
final requestId = DevPanelStore.instance.startApiRequest(
  method: 'POST',
  url: 'https://api.example.com/data',
  requestBody: {'key': 'value'},
);

// Later, complete the request
DevPanelStore.instance.completeApiRequest(
  requestId: requestId,
  statusCode: 201,
  durationMs: 250,
  responseBody: {'success': true},
);
```

---

### Logs Tab

Console logs with filtering by severity level. Tap the copy icon on any log entry to copy the full entry (level, timestamp, tag, message, and stack trace) to the clipboard.

```dart
import 'package:error_stack/error_stack.dart';

// Log at different levels
DevPanelStore.instance.debug('Debug message');
DevPanelStore.instance.info('User logged in', tag: 'auth');
DevPanelStore.instance.warning('Cache miss for key');
DevPanelStore.instance.error('Failed to load data', stackTrace: trace.toString());

// With metadata
DevPanelStore.instance.info(
  'Payment processed',
  tag: 'payments',
  metadata: {'amount': 99.99, 'currency': 'USD'},
);
```

---

### Routes Tab

Navigation history with route names, arguments, and actions. Tap a route to open its details sheet, where you can copy the route name to the clipboard.

Route tracking is automatic when using `ErrorStackNavigatorObserver`:

```dart
MaterialApp(
  navigatorObservers: [ErrorStackNavigatorObserver()],
  // ...
)
```

Manual tracking is also available:

```dart
DevPanelStore.instance.trackRoutePush('/profile', arguments: {'userId': 123});
DevPanelStore.instance.trackRoutePop('/profile');
DevPanelStore.instance.trackRouteReplace('/home');
```

---

### Storage Tab

View all local storage data from both Secure Storage and Shared Preferences. Tap an entry to open the edit modal, where you can copy the key or value to the clipboard or update the stored value.

---

### UI Debug Tools

The dev panel includes visual debugging overlays:

| Tool | Description |
|------|-------------|
| Grid Paper | Overlay grid for alignment checking |
| Layout Bounds | Show widget boundaries |
| Text Scale | Override text scale (0.5-3.0x) |
| Color Blindness | Simulate protanopia, deuteranopia, tritanopia |
| Slow Animations | 5x animation slowdown |
| Performance Overlay | Flutter performance metrics |
| Safe Areas | Visualize safe area boundaries |

Control programmatically:

```dart
final store = DevPanelStore.instance;

store.toggleGridPaper(true);
store.setGridSpacing(24.0);
store.toggleLayoutBounds(true);
store.setTextScaleFactor(1.5);
store.setColorBlindnessMode(ColorBlindnessMode.protanopia);
store.toggleSlowAnimations(true);
store.togglePerformanceOverlay(true);
store.toggleSafeAreas(true);

// Reset all to defaults
store.resetUIDebugSettings();
```

---

## Architecture

Error Stack follows SOLID principles with a modular design:

```
lib/
├── error_stack.dart              # Main entry point & exports
├── error_stack_dio.dart          # Dio interceptor export
├── src/
│   ├── config/                   # Configuration classes
│   ├── storage/                  # Storage abstraction
│   ├── handler/                  # Error handling logic
│   └── dev_panel/                # Dev panel components
│       ├── data/                 # Store, models, collections
│       ├── widgets/              # Panel UI widgets
│       ├── interceptors/         # Dio interceptor
│       └── observers/            # Navigator observer
└── widgets/                      # Error display widgets
```

---

## Example

Check out the [example](/example) app for comprehensive demos including:

- Basic setup
- Custom error widgets
- Dev panel features
- Dio integration

---

## Changelog

See [CHANGELOG](https://github.com/nylo-core/error-stack/blob/master/CHANGELOG.md) for release history.

## Social

- [Twitter](https://twitter.com/nylo_dev)

## License

The MIT License (MIT). See [LICENSE](https://github.com/nylo-core/error-stack/blob/main/LICENSE) for details.

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