[IMPROVE] Allow to check livechat online status per department

src/definition/accessors/ILivechatRead.ts

@@ -3,7 +3,11 @@ import { ILivechatRoom } from '../livechat/ILivechatRoom';
 import { IVisitor } from '../livechat/IVisitor';
 
 export interface ILivechatRead {
-    isOnline(): boolean;
+    /**
+     * Gets online status of the livechat.
+     * @param departmentId (optional) the id of the livechat department
+     */
+    isOnline(departmentId?: string): boolean;
     getLivechatRooms(visitor: IVisitor, departmentId?: string): Promise<Array<ILivechatRoom>>;
     /**
      * @deprecated This method does not adhere to the conversion practices applied

src/server/accessors/LivechatRead.ts

@@ -6,8 +6,8 @@ import { ILivechatBridge } from '../bridges/ILivechatBridge';
 export class LivechatRead implements ILivechatRead {
     constructor(private readonly livechatBridge: ILivechatBridge, private readonly appId: string) { }
 
-    public isOnline(): boolean {
-        return this.livechatBridge.isOnline();
+    public isOnline(departmentId?: string): boolean {
+        return this.livechatBridge.isOnline(departmentId);
     }
 
     public getLivechatRooms(visitor: IVisitor, departmentId?: string): Promise<Array<ILivechatRoom>> {

src/server/bridges/ILivechatBridge.ts

@@ -2,7 +2,7 @@ import { IDepartment, ILivechatMessage, ILivechatRoom, ILivechatTransferData, IV
 import { IUser } from '../../definition/users';
 
 export interface ILivechatBridge {
-    isOnline(): boolean;
+    isOnline(departmentId?: string): boolean;
     createMessage(message: ILivechatMessage, appId: string): Promise<string>;
     getMessageById(messageId: string, appId: string): Promise<ILivechatMessage>;
     updateMessage(message: ILivechatMessage, appId: string): Promise<void>;

tests/test-data/bridges/livechatBridge.ts

@@ -3,7 +3,7 @@ import { IUser } from '../../../src/definition/users';
 import { ILivechatBridge } from '../../../src/server/bridges/ILivechatBridge';
 
 export class TestLivechatBridge implements ILivechatBridge {
-    public isOnline(): boolean {
+    public isOnline(departmentId?: string): boolean {
         throw new Error('Method not implemented');
     }
     public createMessage(message: ILivechatMessage, appId: string): Promise<string> {