dialog_flowtter

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dialog_flowtter

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A Flutter implementation of Google's Dialog Flow improved

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<img src="https://raw.githubusercontent.com/Deimos-Applications/dialog_flowtter/master/.github/dialog_flowtter_icon.png" width="100%" alt="logo" />
<h2 align="center">
  A Flutter implementation of DialogFlow, improved.
</h2>
  <p align="center">
    Build your integrations with DialogFlow easier and faster.
  </p>

# About the package

> Dialog Flow on Flutter, now with Null Safety support!

DialogFlowtter is a package that helps you to build integrations with DialogFlow easier and faster.

- Authenticate with Google Auth Json
- Get an authenticated http client so you can talk with your DialogFlow agent
- Get access to all DialogFlow responses and models easily
- Inspect what values a DialogFlow response could have

## Why DialogFlowtter

The problem with the current DialogFlow integration packages that are available in Pub is that they're:

- Completely abandoned
- Not well documented
- Lack functionality
- Lack flexibility

This one is intended to solve those problems and add more features that I've seen the users want. Check the [TO-DO section](#to-do) for more info on that.

# Platform support

This package is fully supported in **Android**, **iOS** and **Web**.
We have plans on testing and adding support for _Windows_, _Linux_ and _MacOS_ as this platforms mature in the Flutter SDK.

# Installation

1. Add the package to your flutter dependencies in you `pubspec.yaml`:

```yaml
    dependencies:
        dialog_flowtter: ^0.3.1
    ```

2. Make sure you add your dialog_flow_auth.json to the `pubspec.yaml` assets:

```yaml
    flutter:
        uses-material-design: true
        assets:
            - assets/dialog_flow_auth.json
   ```

3. Add your DialogFlow Auth JSON to the `assets` folder and rename it to `dialog_flow_auth.json`
  
> You can change the name and Path of your JSON later in the code. Just make sure to use the same one in the `pubspec.yaml`
  
4. Get the packages from:

```shell
    flutter packages get
    ```

# Get your keys

Refer to [Create a service account and download the private key file](https://cloud.google.com/dialogflow/docs/quick/setup#sa-create)

# How to use

## Retrieve your keys

You can set your _DialogFlow_ authentication keys in various ways.

1. From an in-memory JSON

```dart
  DialogAuthCredentials credentials = DialogAuthCredentials.fromJson(json);
  ```

2. From a JSON file 
   
  ```dart
  DialogAuthCredentials credentials = await DialogAuthCredentials.fromFile(path);
  ```

> This method is asynchronous!

3. From the Network

```dart
  DialogAuthCredentials credentials = await DialogAuthCredentials.fromNetwork(url);
  ```

> This method is asynchronous!

Then, pass your credentials to you `DialogFlowtter` class

```dart
  DialogFlowtter instance = DialogFlowtter(
    credentials: credentials,
  );
  ```

> You can also use the shorthand expression of these methods when instanciating the `DialogFlowtter` class

```dart
  DialogFlowtter jsonInstance = DialogFlowtter.fromJson(json);

//! async
  DialogFlowtter fileInstance = await DialogFlowtter.fromFile(path);

//! async
  DialogFlowtter networkInstance = await DialogFlowtter.fromNetwork(url);
  ```

## Detect intent

One of the core features of DialogFlow is to detect what a person is trying to say. You can do that by detecting an intent that you have defined in your [DialogFlow console](https://dialogflow.cloud.google.com/)

1. Create an instance of `DialogFlowtter` and set the `sessionId` that will be used to identify the current conversation of the user with DialogFlow.

> It's _**highly**_ recommended that you use a different `sessionId` for every conversation that the user establishes with the Assistant
  
  ```dart
    final DialogFlowtter dialogFlowtter = DialogFlowtter(
      credentials: credentials,
      sessionId: "YOUR_SESSION_ID_HERE",
    );
  ```

2. Create a `QueryInput` where you can specify what data you want to send to DialogFlow.

```dart
    final QueryInput queryInput = QueryInput(
      text: TextInput(
        text: "Hi. How are you?",
        languageCode: "en",
      ),
    );
  ```

3. Send your input to DialogFlow through the `detectIntent` function.

```dart
    DetectIntentResponse response = await dialogFlowtter.detectIntent(
      queryInput: queryInput,
    );
  ```

> You can check the code for more info on what info you can send and receive

## Get the info from the intent

You can access the info returned by DialogFlow from the `DetectIntentResponse` that the `detectIntent` function returns.

### Get the text from the response

```dart
  DetectIntentResponse response = await dialogFlowtter.detectIntent(
    queryInput: QueryInput(text: TextInput(text: "Hi")),
  );
  
  String? textResponse = response.text;

print(textResponse); // Hi, how may I help you?
```

> _response.text_ returns null if there's no text returned by DialogFlow or if the first message returned it's not of type MessageType.text

### Get the message from the response

See [Message](https://github.com/Deimos-Applications/dialog_flowtter/blob/master/lib/src/models/intent/message.dart) for more info on what the model properties can be
Also, check [this issue](https://github.com/Deimos-Applications/dialog_flowtter/issues/9) to see how to create and use [Rich Responses](https://cloud.google.com/dialogflow/es/docs/intents-rich-messages) like cards and carousels

```dart
  DetectIntentResponse response = await dialogFlowtter.detectIntent(
    queryInput: QueryInput(text: TextInput(text: "Hi")),
  );
  
  Message? messageResponse = response.message;
```

### Get audio from the response

1. Set the audio configuration in the `detectIntent` function
```dart
  DetectIntentResponse response = await dialogFlowtter.detectIntent(
    queryInput: QueryInput(text: TextInput(text: "Hi")),
    
    // You can set your own configuration with the OutputAudioConfig class
    audioConfig: OutputAudioConfig(),
  );
```

2. Retrieve the audio from the response
```dart
  String? audioBase64 = response.outputAudio;
  Uint8List? audioBytes = response.outputAudioBytes;
```

3. Play the audio response with your favorite plugin!

> Check [Soundpool](https://pub.dev/packages/soundpool) for playing the audio from memory

### Get the response type of the message

```dart
  MessageType? messageType = response.message.type;

print(messageType); /// MessageType.card
```

> _response.message_ returns null if there's no messages returned by DialogFlow

### Be sure to dispose the instance when you're done using it

```dart
    dialogFlowtter.dispose();
  ```

## Change the project id

You can change the Project ID that `DialogFlowtter` will use to find your intents in DialogFlow.

1. Create an instance of `DialogFlowtter`

```dart
    final DialogFlowtter dialogFlowtter = DialogFlowtter(
      credentials: credentials,
    );
  ```

2. Change the `projectId` prop of the instance;

```dart
    dialogFlowtter.projectId = "deimos-apps-0905";
  ```

- Pro tip. You can do the exact same thing as above with the special Dart's [cascade notation](https://dart.dev/guides/language/language-tour#cascade-notation-).

```dart
    final DialogFlowtter dialogFlowtter = DialogFlowtter(
      credentials: credentials,
    )..projectId = "deimos-apps-0905";
  ```

## Make authenticated http requests to your DialogFlow project

You can access the authenticated http client generated by the package by calling the `client` attribute in your instance.

Keep in mind that this can become `null` if you have disposed your instance before.

## Create your own authenticated http client

You can get an authenticated, auto refreshing http client with your custom json data if you call the static function 
```dart
final credentials = DialogAuthCredentials.fromJson(yourJson);
final client = DialogFlowtter.getClient(credentials)
```

Keep in mind that this only authenticates with json provided by Google.

Check [googleapis_auth](https://pub.dev/packages/googleapis_auth) for more info.

# Further considerations

Every time you instanciate `DialogFlowtter`, the class creates an authenticated http client, with the credentials obtained from the DialogFlow Auth JSON. Be sure to save this instance and reuse it to avoid memory leaks

## Memory leaks

Make sure to `dispose` your `DialogFlowtter` instance whenever you're done using it. This makes sure to close the authenticated http client and all its `StreamSubscription`s to avoid memory leaks.

## Too many models

We have coded almost every Dialog Flow model that you may need to use when implementing this package so you don't have to work with annoying `Map<String, dynamic>` objects. Feel free to ask for any model that is missing to be added to the package.

> The models that were not coded are included as annoying `Map<String, dynamic>` and are tagged with the `//? Create model if necessary`.

# TO-DO

- [x] Add support for null safety 
- [x] Add support for cards, images, etc.
- [x] Memory, file and remote auth JSON
- [ ] Secure DialogFlow auth JSON
- [ ] Support audio queries
- [ ] Add a catalog of supported languages
- [ ] Add direct access to common used attributes
- [ ] Support use of custom HTTP Client

## Starware

`DialogFlowtter` is Starware.  
This means you're free to use the project, as long as you star its GitHub repository.  
Your appreciation makes us grow and glow up. ⭐

# Contribute

**Your help is always appreciated.**

You can contribute by checking our [contributing guide](CONTRIBUTING.md) or opening an [issue](https://github.com/Deimos-Applications/dialog_flowtter/issues).

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