# Accessible SSH Terminal 🚀

A Flutter-based SSH Client designed from the ground up for **accessibility**.

Unlike traditional terminal emulators that render text onto a canvas (making them invisible or hard to read for screen readers like TalkBack, VoiceOver, or NVDA), this project uses native UI widgets to render the terminal output. This ensures 100% semantic compatibility with accessibility tools.

## 🌟 Key Features

*   **Screen Reader First:**
    *   **Native Rendering:** Terminal output is rendered as a native list of text blocks, not a bitmap image.
    *   **Garbage-Free Audio:** Advanced ANSI & OSC filtering strips out cursor movement codes, window titles, and noise, ensuring screen readers only announce relevant text content.
    *   **Smart Announcements:** New output is announced automatically via the Semantics API.
*   **Two Operation Modes:**
    *   **💬 Chat Mode (Default):** Compose commands in a text field and send them on Enter. Reduces network overhead and screen reader noise. Perfect for standard shell usage.
    *   **⚡ Interactive Mode:** Character-by-character input for tools like `vi`, `nano`, or games.
*   **Secure Connection Manager:**
    *   **Saved Connections:** Store your favorite servers for quick access.
    *   **Private Key Support:** Import standard PEM private keys for authentication.
    *   **Security:** Passwords are **NEVER** saved to disk. Private keys are stored locally if chosen.
*   **Smart Session Management:**
    *   **Auto-Close:** Typing `exit` or logging out cleanly closes the session and returns you to the connection list.
    *   **Resilience:** Detects network timeouts or unexpected server closures and informs the user via accessible dialogs.
*   **Adaptive Layout:**
    *   Automatically switches between a single-column mobile view and a split-screen layout for tablets/desktops.

## 📂 Project Structure

The codebase follows a clean layered architecture using **Riverpod** for state management:

*   **`lib/main.dart`**: Application entry point and theme configuration.
*   **`lib/models/`**: Data definitions.
    *   `terminal_line.dart`: Represents a single line of terminal output.
    *   `saved_connection.dart`: Data structure for stored connection details.
*   **`lib/services/`**: Core logic and external systems.
    *   `ssh_service.dart`: Wraps `dartssh2` to handle socket connections, encryption, streams, and exit codes.
*   **`lib/state/`**: Application state (ViewModels).
    *   `terminal_provider.dart`: Manages the active session, buffers output, and handles connection/error states.
    *   `saved_connections_provider.dart`: Persists connection lists to local storage (`shared_preferences`).
*   **`lib/ui/`**: User Interface.
    *   `views/`: Full-screen pages (`connection_view.dart`, `terminal_view.dart`, `tablet_screen.dart`).
    *   `widgets/`: Reusable components, including the critical `ansi_text_parser.dart` for text cleaning.

## 🛠️ Architecture

*   **Framework:** [Flutter](https://flutter.dev) (Latest Stable)
*   **SSH Engine:** [dartssh2](https://pub.dev/packages/dartssh2) for pure Dart SSH implementation.
*   **State Management:** [Riverpod](https://riverpod.dev) for robust and testable state.
*   **Storage:** `shared_preferences` and `file_picker`.

## 📱 Getting Started

### Prerequisites

*   Flutter SDK (3.0+)
*   An Android device/emulator or Windows PC.

### Installation

1.  **Clone the repository:**
    ```bash
    git clone https://github.com/your-org/accessible_terminal.git
    cd accessible_terminal
    ```

2.  **Install dependencies:**
    ```bash
    flutter pub get
    ```

3.  **Run the app:**
    ```bash
    # For Android
    flutter run

    # For Windows
    flutter run -d windows
    ```

## 🧪 Development & Testing

Run the test suite to ensure accessibility features and logic are intact:

```bash
flutter test
```

Key tests include:
*   `test/ansi_parser_test.dart`: Verifies that ANSI colors and OSC sequences are correctly stripped.
*   `test/widget_test.dart`: Smoke tests for the main UI views.

## ⌨️ Usage Guide

### Connecting
1.  Launch the app to see your Saved Connections.
2.  Click the **(+)** button to create a new connection.
3.  Enter Host (e.g., `192.168.1.50`), Port (default `22`), and Username.
4.  **Authentication:**
    *   **Password:** Leave the key field empty.
    *   **Private Key:** Click "Select Private Key" to import a PEM file.
5.  Toggle **"Save Connection Details"** to store Host/User/Key (Passwords are not saved).
6.  Click **Connect**.
7.  Enter your Password or Key Passphrase in the dialog.

### Using the Terminal
*   **Chat Mode:** Type your command in the bottom text field. Press `Enter` or click the `Send` icon to execute. This is the most accessible way to interact.
*   **Interactive Mode:** Toggle the switch in the top bar. The text field will disappear. Type directly on your keyboard to interact with the shell in real-time.
*   **Exiting:** Type `exit` to close the session and return to the connection list.

## 📄 License

**Proprietary Software.**
All rights reserved. Unauthorized copying, modification, distribution, or use of this software is strictly prohibited.