fuse-angular/src/app/modules/admin/apps/chat/chats/chats.component.ts

import { ChangeDetectionStrategy, ChangeDetectorRef, Component, OnDestroy, OnInit, ViewEncapsulation } from '@angular/core';
import { Subject, takeUntil } from 'rxjs';
import { Chat, Profile } from 'app/modules/admin/apps/chat/chat.types';
import { ChatService } from 'app/modules/admin/apps/chat/chat.service';

@Component({
    selector       : 'chat-chats',
    templateUrl    : './chats.component.html',
    encapsulation  : ViewEncapsulation.None,
    changeDetection: ChangeDetectionStrategy.OnPush
})
export class ChatsComponent implements OnInit, OnDestroy
{
    chats: Chat[];
    drawerComponent: 'profile' | 'new-chat';
    drawerOpened: boolean = false;
    filteredChats: Chat[];
    profile: Profile;
    selectedChat: Chat;
    private _unsubscribeAll: Subject<any> = new Subject<any>();

    /**
     * Constructor
     */
    constructor(
        private _chatService: ChatService,
        private _changeDetectorRef: ChangeDetectorRef
    )
    {
    }

    // -----------------------------------------------------------------------------------------------------
    // @ Lifecycle hooks
    // -----------------------------------------------------------------------------------------------------

    /**
     * On init
     */
    ngOnInit(): void
    {
        // Chats
        this._chatService.chats$
            .pipe(takeUntil(this._unsubscribeAll))
            .subscribe((chats: Chat[]) => {
                this.chats = this.filteredChats = chats;

                // Mark for check
                this._changeDetectorRef.markForCheck();
            });

        // Profile
        this._chatService.profile$
            .pipe(takeUntil(this._unsubscribeAll))
            .subscribe((profile: Profile) => {
                this.profile = profile;

                // Mark for check
                this._changeDetectorRef.markForCheck();
            });

        // Selected chat
        this._chatService.chat$
            .pipe(takeUntil(this._unsubscribeAll))
            .subscribe((chat: Chat) => {
                this.selectedChat = chat;

                // Mark for check
                this._changeDetectorRef.markForCheck();
            });
    }

    /**
     * On destroy
     */
    ngOnDestroy(): void
    {
        // Unsubscribe from all subscriptions
        this._unsubscribeAll.next(null);
        this._unsubscribeAll.complete();
    }

    // -----------------------------------------------------------------------------------------------------
    // @ Public methods
    // -----------------------------------------------------------------------------------------------------

    /**
     * Filter the chats
     *
     * @param query
     */
    filterChats(query: string): void
    {
        // Reset the filter
        if ( !query )
        {
            this.filteredChats = this.chats;
            return;
        }

        this.filteredChats = this.chats.filter(chat => chat.contact.name.toLowerCase().includes(query.toLowerCase()));
    }

    /**
     * Open the new chat sidebar
     */
    openNewChat(): void
    {
        this.drawerComponent = 'new-chat';
        this.drawerOpened = true;

        // Mark for check
        this._changeDetectorRef.markForCheck();
    }

    /**
     * Open the profile sidebar
     */
    openProfile(): void
    {
        this.drawerComponent = 'profile';
        this.drawerOpened = true;

        // Mark for check
        this._changeDetectorRef.markForCheck();
    }

    /**
     * Track by function for ngFor loops
     *
     * @param index
     * @param item
     */
    trackByFn(index: number, item: any): any
    {
        return item.id || index;
    }
}