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💬 React component for conversational UI

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# chat-ui-react

[![npm version](https://badge.fury.io/js/chat-ui-react.svg)](https://badge.fury.io/js/chat-ui-react) [![ci](https://github.com/twihike/chat-ui-react/workflows/ci/badge.svg)](https://github.com/twihike/chat-ui-react/actions) [![release](https://github.com/twihike/chat-ui-react/workflows/release/badge.svg)](https://github.com/twihike/chat-ui-react/actions) [![license](https://img.shields.io/github/license/twihike/chat-ui-react)](https://raw.githubusercontent.com/twihike/chat-ui-react/master/LICENSE)

chat-ui-react is an npm package for building conversational web UIs.
This package offers the following:

- React component
  - Chat message
  - Message input form
- Class that controls the display of components

You can incorporate this into your online chats and chatbots.

Currently, the component uses React's UI framework Material-UI.
If you want a component other than Material-UI, you can replace it with the original component and use it.

![demo](https://raw.githubusercontent.com/twihike/chat-ui-react/assets/chat-ui-react-demo.gif)

## Demo

See the [demo site](https://chat-ui-react-demo.netlify.app).

## Example

See the `example` directory.

- echo-bot: A chatbot that echoes user input.
- cdn: An easy way to get started quickly.

## Installation

### Node.js

With npm:

```shell
npm install chat-ui-react react react-dom @material-ui/core
```

With yarn:

```shell
yarn add chat-ui-react react react-dom @material-ui/core
```

### CDN

```html
<script crossorigin="anonymous" src="https://unpkg.com/react@16/umd/react.development.js"></script>
<script crossorigin="anonymous" src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
<script crossorigin="anonymous" src="https://unpkg.com/@material-ui/core@4/umd/material-ui.development.js"></script>
<script crossorigin="anonymous" src="https://unpkg.com/chat-ui-react@latest/dist/browser/chat-ui-react.umd.polyfill.js"></script>
<script crossorigin="anonymous" src="https://unpkg.com/@babel/standalone@7/babel.min.js"></script>
```

## Usage

This package consists of a `MuiChat` component that displays the chat and a `ChatController` class that controls the display of the chat. The figure below shows each relationship.

This structure allows us to focus solely on passing the chat display to the `ChatController`. You don't have to worry about display control of components.

If you don't like what you see, you can replace `MuiChat` with another component. There is no change in the app due to replacement.

Here's a simple example to understand how to use it.

```tsx
function App(): React.ReactElement {
  const [chatCtl] = React.useState(new ChatController());

React.useMemo(async () => {
    // Chat content is displayed using ChatController
    await chatCtl.addMessage({
      type: 'text',
      content: `Hello, What's your name.`,
      self: false,
    });
    const name = await chatCtl.setActionRequest({ type: 'text' });
  }, [chatCtl]);

// Only one component used for display
  return <MuiChat chatController={chatCtl} />;
}
```

In the following, we will explain how to use `ChatController`.

### Message

To display the chat message, use the `addMessage` method.
In the `self` option, specify whether it is your own message or someone else's message.

```typescript
await chatCtl.addMessage({
  type: 'text',
  content: `Hello, What's your name.`,
  self: false,
});
```

### Action

Use the `setActionRequest` method to prompt the user for a message.

#### Number of actions

There are two ways to request an action: one-time action and always request action.

##### One-time action

Specify `false` for the `always` option to request a one-time action from the user.
The return value of the method is a `Promise` that returns the user input.

```typescript
const response = await chatCtl.setActionRequest({
  type: 'text',
  always: false,
});
console.log(response.value);
```

##### Always action

To always request an action from the user, specify `true` in the `always` option.
Specify the callback function that receives the input because it is input multiple times by the user.
To cancel the input request from the user, call the `cancelActionRequest` method.

```typescript
chatCtl.setActionRequest(
  { type: 'text', always: true },
  (response) => {
    console.log(response.value);
  }
);
chatCtl.cancelActionRequest();
```

#### Action type

There are several types of actions such as text and selection.

##### Text

This action inputs a string.

Specify `text` for `type`.
The return value of the method is the message entered by the user.

```typescript
const response = await chatCtl.setActionRequest({ type: 'text' });
console.log(response.value);
```

##### Single selection

This action selects one from the options.

Specify `select` for `type`. Specify the options in `options`. `value` is used for html attributes and `text` is used for screen display.
The return value of the method is the element of the `options` selected by the user.

```typescript
const response = await chatCtl.setActionRequest({
  type: 'select',
  options: [
    {
      value: 'a',
      text: 'A',
    },
    {
      value: 'b',
      text: 'B',
    },
  ],
});
console.log(response.option);
// If A is selected
// { value: 'a', text: 'A' }
```

##### Multiple selection

This action selects multiple options.

Specify `multi-select` for `type`. Specify the options in `options`. `value` is used for html attributes and `text` is used for display. The return value of the method is the selected `options`.

```typescript
const response = await chatCtl.setActionRequest({
  type: 'multi-select',
  options: [
    {
      value: 'a',
      text: 'A',
    },
    {
      value: 'b',
      text: 'B',
    },
  ],
});
console.log(response.options);
//  If A and B are selected
// [{ value: 'a', text: 'A' }, { value: 'b', text: 'B' }]
```

##### File

This action inputs a file.

Specify `file` for `type`. You can specify `accept` and `multiple` as attributes of the `input` tag. The return value of the method is an array of files entered by the user.

```typescript
const response = await chatCtl.setActionRequest({
  type: 'file',
  accept: 'image/*',
  multiple: true,
});
console.log(response.files);
```

##### Audio

This action inputs audio.

Specify `audio` for `type`. The return value of the method is the `Blob` of the audio input by the user. If the audio input fails, the `Reject` rejected `Promise` is returned.

```typescript
try {
  const response = await chatCtl.setActionRequest({
    type: 'audio',
  });
  console.log(response.audio);
} catch (e) {
  console.log(e);
}
```

##### Custom

This action uses your custom component as input.
Specify `custom` for `type`. Specify your component in `Component`.

Custom components follow the React conventions to create input forms as usual.
It receives `chatController` and `actionRequest` as properties. This is automatically set by chat-ui-react.
Then, set the input received from the user to the `setActionResponse` method of the `ChatController` class.
This can be received by the application as the return value of `setActionRequest`.

```tsx
function GoodInput({
  chatController,
  actionRequest,
}: {
  chatController: ChatController;
  actionRequest: ActionRequest;
}) {
  const chatCtl = chatController;

const setResponse = React.useCallback((): void => {
    const res = { type: 'custom', value: 'Good!' };
    chatCtl.setActionResponse(actionRequest, res);
  }, [actionRequest, chatCtl]);

return (
    <Button
      type="button"
      onClick={setResponse}
      variant="contained"
      color="primary"
    >
      Good!
    </Button>
  );
}

const custom = await chatCtl.setActionRequest({
  type: 'custom',
  Component: GoodInput,
});
console.log(custom.value);
```

## License

This project is licensed under the terms of the MIT license.

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