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import {
LitElement,
PropertyValues,
TemplateResult,
html,
css,
PropertyValueMap
} from 'lit';
import { property } from 'lit/decorators.js';
import { generateUUIDv7, getCookie, setCookie } from '../utils';
import { DEFAULT_AVATAR } from './assets';
import { Chat, MsgEvent } from '../display/Chat';
interface User {
avatar?: string;
email: string;
name: string;
id: string;
}
interface MsgIn {
id: string;
text: string;
time: string;
}
interface MsgOut extends MsgIn {
user: User;
origin: string;
}
interface SockMsg {
type:
| 'start_chat'
| 'get_history'
| 'send_msg'
| 'ack_chat'
// responses
| 'chat_started'
| 'chat_resumed'
| 'msg_in'
| 'msg_out'
| 'history'
// receiving
| 'chat_out';
}
interface GetHistoryCmd extends SockMsg {
before?: string;
}
interface StartChatCmd extends SockMsg {
chat_id?: string;
}
interface SendMsgCmd extends SockMsg {
text: string;
}
interface Ack extends SockMsg {
msg_id: string;
}
interface MsgOutResponse extends SockMsg {
msg_out: MsgOut;
}
interface MsgInResponse extends SockMsg {
msg_in: MsgIn;
}
interface HistoryResponse extends SockMsg {
history: (MsgInResponse | MsgOutResponse)[];
}
interface StartChatResponse extends SockMsg {
chat_id: string;
}
interface ResumeChatResponse extends StartChatResponse {
email?: string;
}
enum ChatStatus {
DISCONNECTED = 'disconnected',
CONNECTING = 'connecting',
CONNECTED = 'connected'
}
const sockToChat = function (msg: any): MsgEvent {
const type = msg.msg_in ? 'msg_created' : 'msg_received';
const msgContent = msg.msg_in || msg.msg_out;
return {
uuid: msgContent.id,
type,
created_on: new Date(msgContent.time),
_user: msgContent.user,
msg: {
text: msgContent.text,
channel: undefined,
quick_replies: [],
urn: '',
direction: '',
type: '',
attachments: msgContent.attachments
}
};
};
export class WebChat extends LitElement {
static get styles() {
return css`
:host {
display: flex;
align-items: center;
align-self: center;
--curvature: 0.6em;
--color-primary: hsla(208, 70%, 55%, 1);
font-family: 'Roboto', 'Helvetica Neue', sans-serif;
font-weight: 400;
--toggle-speed: 80ms;
position: fixed;
right: 0;
bottom: 0;
z-index: 10000;
}
.header {
background: var(--color-primary);
height: 3em;
display: flex;
align-items: center;
width: 100%;
color: rgba(255, 255, 255, 0.8);
font-size: 0.8em;
}
.header slot {
flex-grow: 1;
padding: 1em;
color: rgba(255, 255, 255, 0.9);
font-size: 1.2em;
display: block;
}
.header .close-button {
margin: 0.5em;
color: rgba(255, 255, 255, 0.5);
cursor: pointer;
}
.header .close-button:hover {
cursor: pointer;
color: rgba(255, 255, 255, 1);
}
.block {
margin-bottom: 1em;
}
.time {
text-align: center;
font-size: 0.8em;
color: #999;
margin-top: 2em;
border-top: 1px solid #f8f8f8;
padding: 1em;
margin-left: 4em;
margin-right: 4em;
}
.first .time {
margin-top: 0;
border-top: none;
padding-top: 0;
}
.row {
display: flex;
flex-direction: row;
align-items: flex-start;
}
.input-panel {
padding: 1em;
background: #fff;
}
.border {
border-top: 1px solid #e9e9e9;
margin: 0 1em;
}
.avatar {
margin-top: 0.6em;
margin-right: 0.6em;
flex-shrink: 0;
width: 2em;
height: 2em;
overflow: hidden;
border-radius: 100%;
box-shadow:
rgba(0, 0, 0, 0.1) 0px 3px 7px 0px,
rgba(0, 0, 0, 0.2) 0px 1px 2px 0px,
inset 0 0 0 0.15em rgba(0, 0, 0, 0.1);
}
.toggle {
flex-shrink: 0;
width: 4em;
height: 4em;
overflow: hidden;
border-radius: 100%;
box-shadow:
rgba(0, 0, 0, 0.1) 0px 0px 1em 0.7em,
rgba(0, 0, 0, 0.2) 0px 1px 2px 0px,
inset 0 0 0 0.25em rgba(0, 0, 0, 0.1);
cursor: pointer;
transition: box-shadow var(--toggle-speed) ease-out;
position: absolute;
bottom: 1em;
right: 1em;
}
.toggle:hover {
box-shadow:
rgba(0, 0, 0, 0.1) 0px 0px 1em 0.7em,
rgba(0, 0, 0, 0.4) 0px 1px 2px 0px,
inset 0 0 0 0.25em rgba(0, 0, 0, 0.2);
}
.incoming .row {
flex-direction: row-reverse;
margin-left: 1em;
}
.bubble {
padding: 1em;
padding-bottom: 0.5em;
background: #fafafa;
border-radius: var(--curvature);
max-width: 70%;
}
.bubble .name {
font-size: 0.95em;
font-weight: 400;
color: #888;
margin-bottom: 0.25em;
}
.outgoing .bubble {
border-top-left-radius: 0;
}
.incoming .bubble {
background: var(--color-primary);
color: white;
border-top-right-radius: 0;
text-align: right;
}
.message {
margin-bottom: 0.5em;
line-height: 1.2em;
}
.chat {
height: 40rem;
width: 28rem;
border-radius: var(--curvature);
overflow: hidden;
box-shadow:
rgba(0, 0, 0, 0.1) 0px 3px 7px 0px,
rgba(0, 0, 0, 0.2) 0px 1px 2px 0px,
rgba(0, 0, 0, 0.1) 5em 5em 5em 5em;
position: absolute;
bottom: 3em;
right: 1em;
transition: all var(--toggle-speed) ease-out;
transform: scale(0.9);
pointer-events: none;
opacity: 0;
display: flex;
flex-direction: column;
background: #fff;
}
.chat.open {
bottom: 6em;
opacity: 1;
transform: scale(1);
pointer-events: initial;
}
.input {
border: none;
flex-grow: 1;
color: #333;
font-size: 1em;
}
.input:focus {
outline: none;
}
input::placeholder {
opacity: 0.3;
}
.input.inactive {
// pointer-events: none;
// opacity: 0.3;
}
.active {
}
.send-icon {
color: #eee;
pointer-events: none;
transform: rotate(-45deg);
transition: transform 0.2s ease-out;
}
.pending .send-icon {
color: var(--color-primary);
pointer-events: initial;
transform: rotate(0deg);
}
.notice {
padding: 1em;
background: #f8f8f8;
color: #666;
text-align: center;
cursor: pointer;
}
.connecting .notice {
display: flex;
justify-content: center;
}
.connecting .notice temba-icon {
margin-left: 0.5em;
}
.reconnect {
color: var(--color-primary);
text-decoration: underline;
font-size: 0.9em;
}
.input:disabled {
background: transparent !important;
}
temba-loading {
justify-content: center;
margin: 0.5em auto;
margin-bottom: 2em;
}
temba-loading.hidden {
display: none;
}
`;
}
@property({ type: String })
channel: string;
@property({ type: String })
urn: string;
@property({ type: Array })
messageGroups: string[][] = [];
// is our socket connection established
@property({ type: String })
status: ChatStatus = ChatStatus.DISCONNECTED;
// is the chat widget open
@property({ type: Boolean })
open = false;
@property({ type: Boolean })
hasPendingText = false;
@property({ type: String })
host: string;
@property({ type: String })
activeUserAvatar: string;
@property({ type: Boolean, attribute: false })
blockHistoryFetching = false;
private chat: Chat;
private sock: WebSocket;
private newMessageCount = 0;
private fetchRequested: Date;
private beforeTime: string;
public constructor() {
super();
}
public willUpdate(changed: PropertyValues): void {
super.willUpdate(changed);
// pre-sync status to CONNECTING to avoid setting it during updated()
if (changed.has('open') && this.open && changed.get('open') !== undefined) {
if (this.status === ChatStatus.DISCONNECTED) {
this.status = ChatStatus.CONNECTING;
}
}
}
public firstUpdated(
changed: PropertyValueMap<any> | Map<PropertyKey, unknown>
): void {
super.firstUpdated(changed);
this.chat = this.shadowRoot.querySelector('temba-chat');
// Only create lightbox if one doesn't already exist
if (!document.querySelector('temba-lightbox')) {
const lightbox = document.createElement('temba-lightbox');
document.querySelector('body').appendChild(lightbox);
}
}
private handleReconnect() {
this.openSocket();
}
private sendSockMessage(
cmd: GetHistoryCmd | StartChatCmd | SendMsgCmd | Ack
) {
// eslint-disable-next-line no-console
console.log('out', cmd);
this.sock.send(JSON.stringify(cmd));
}
private openSocket(): void {
if (
this.status !== ChatStatus.DISCONNECTED &&
this.status !== ChatStatus.CONNECTING
) {
return;
}
// avoid creating duplicate sockets
if (this.sock && this.sock.readyState <= WebSocket.OPEN) {
return;
}
this.status = ChatStatus.CONNECTING;
const webChat = this;
let url = `wss://localhost.textit.com/wc/connect/${this.channel}/`;
if (this.urn) {
url = `${url}?chat_id=${this.urn}`;
}
const sock = new WebSocket(url);
this.sock = sock;
this.sock.onclose = function () {
webChat.status = ChatStatus.DISCONNECTED;
};
this.sock.onopen = function () {
webChat.beforeTime = new Date().toISOString();
webChat.status = ChatStatus.CONNECTED;
webChat.urn = getCookie('temba-chat-urn');
const cmd: StartChatCmd = { type: 'start_chat' };
if (webChat.urn) {
cmd.chat_id = webChat.urn;
}
webChat.sendSockMessage(cmd);
};
this.sock.onmessage = function (event: MessageEvent) {
webChat.status = ChatStatus.CONNECTED;
const msg = JSON.parse(event.data) as SockMsg;
// eslint-disable-next-line no-console
console.log('in', msg);
if (msg.type === 'chat_started') {
const response = msg as StartChatResponse;
if (webChat.urn !== response.chat_id) {
webChat.messageGroups = [];
}
webChat.urn = response.chat_id;
setCookie('temba-chat-urn', response.chat_id);
webChat.requestUpdate('messageGroups');
} else if (msg.type === 'chat_resumed') {
const response = msg as ResumeChatResponse;
webChat.urn = response.chat_id;
webChat.fetchPreviousMessages();
} else if (msg.type === 'chat_out') {
const response = msg as MsgOutResponse;
webChat.chat.addMessages([sockToChat(response)], null, true);
// ack receipt
const ack: Ack = { type: 'ack_chat', msg_id: response.msg_out.id };
webChat.sendSockMessage(ack);
} else if (msg.type === 'history') {
webChat.handleHistoryResponse(msg as HistoryResponse);
}
};
this.sock.onerror = function () {
webChat.status = ChatStatus.DISCONNECTED;
};
}
public fetchPreviousMessages() {
if (!this.blockHistoryFetching) {
this.fetchRequested = new Date();
this.blockHistoryFetching = true;
this.chat.fetching = true;
const cmd: GetHistoryCmd = {
type: 'get_history',
before: this.beforeTime
};
this.fetchRequested = new Date();
this.sendSockMessage(cmd);
}
}
private handleHistoryResponse(response: HistoryResponse) {
const messages = response.history.reverse();
if (messages.length > 0) {
const oldestMessage = messages[0];
if (oldestMessage['msg_in']) {
const msgIn = (oldestMessage as MsgInResponse).msg_in;
this.beforeTime = msgIn.time;
} else if (oldestMessage['msg_out']) {
const msgOut = (oldestMessage as MsgOutResponse).msg_out;
this.beforeTime = msgOut.time;
}
}
// convert messages to chat messages
this.chat.addMessages(messages.map(sockToChat), this.fetchRequested);
}
public fetchComplete() {
this.blockHistoryFetching = false;
}
private focusInput() {
const input = this.shadowRoot.querySelector('.input') as any;
if (input) {
input.focus();
}
}
public updated(
changed: PropertyValueMap<any> | Map<PropertyKey, unknown>
): void {
super.updated(changed);
if (this.open && changed.has('open') && changed.get('open') !== undefined) {
if (this.status === ChatStatus.CONNECTING) {
this.openSocket();
}
}
if (changed.has('status')) {
if (this.status === ChatStatus.CONNECTED) {
this.focusInput();
}
}
}
public openChat(): void {
this.open = true;
}
public handleKeyUp(event: any) {
if (this.hasPendingText && event.key === 'Enter') {
this.sendPendingMessage();
}
this.hasPendingText = event.target.value.length > 0;
}
private sendPendingMessage() {
if (this.status === ChatStatus.CONNECTED) {
const input = this.shadowRoot.querySelector('.input') as any;
const text = input.value;
input.value = '';
const msg: SendMsgCmd = {
// msg_id: `pending-${this.newMessageCount++}`,
type: 'send_msg',
text: text
// time: new Date().toISOString()
};
this.sendSockMessage(msg);
const date = new Date();
this.chat.addMessages(
[
{
uuid: generateUUIDv7(),
type: 'msg_received',
msg: { text },
created_on: date
} as MsgEvent
],
date,
true
);
this.hasPendingText = input.value.length > 0;
}
}
private handleClickInputPanel(event: MouseEvent) {
event.preventDefault();
event.stopPropagation();
const input = this.shadowRoot.querySelector('.input') as any;
input.focus();
}
private toggleChat() {
this.open = !this.open;
}
public render(): TemplateResult {
return html`
<div class="chat ${this.status} ${this.open ? 'open' : ''}">
<div class="header">
<slot name="header">${this.urn ? this.urn : 'Chat'}</slot>
<temba-icon
name="close"
size="1.3"
class="close-button"
@click=${this.toggleChat}
></temba-icon>
</div>
<temba-chat
@temba-scroll-threshold=${this.fetchPreviousMessages}
@temba-fetch-complete=${this.fetchComplete}
></temba-chat>
${this.status === ChatStatus.DISCONNECTED
? html`<div class="notice">
<div>This chat is not currently connected.</div>
<div class="reconnect" @click=${this.handleReconnect}>
Click here to reconnect
<div></div>
</div>
</div>`
: null}
${this.status === ChatStatus.CONNECTING
? html`<div class="notice">
<div>Connecting</div>
<temba-icon name="progress_spinner" spin></temba-icon>
</div>`
: null}
${this.status === ChatStatus.CONNECTED
? html` <div class="border"></div>
<div
class="row input-panel ${this.hasPendingText ? 'pending' : ''}"
@click=${this.handleClickInputPanel}
>
<input
class="input ${this.status === ChatStatus.CONNECTED
? 'active'
: 'inactive'}"
type="text"
placeholder="Message.."
?disabled=${this.status !== ChatStatus.CONNECTED}
@keydown=${this.handleKeyUp}
/>
<temba-icon
tabindex="1"
class="send-icon"
name="send"
size="1"
clickable
@click=${this.sendPendingMessage}
></temba-icon>
</div>`
: null}
</div>
<div @click=${this.toggleChat}>
<div
class="toggle"
style="background: center / contain no-repeat url(${this
.activeUserAvatar || DEFAULT_AVATAR})"
></div>
</div>
`;
}
}
|