feat: implement message bar and enhance chat functionality

- Added MessageBarComponent for sending messages.
- Integrated message sending logic in ChatService.
- Updated FeedComponent to scroll to the bottom on new messages.
- Improved layout and styling for chat components.
- Adjusted environment configuration for API base URL.

src/app/auth/login/login.component.ts

@@ -11,7 +11,7 @@ import { Router } from '@angular/router';
   styleUrls: ['../auth.module.scss', './login.component.scss']
 })
 export class LoginComponent implements OnInit {
-  loginForm!: FormGroup;
+  public loginForm!: FormGroup;
 
   constructor(
     private authService: AuthService,
@@ -41,7 +41,7 @@ export class LoginComponent implements OnInit {
             this.router.navigateByUrl('chat');
           }
         },
-        error: _ => {
+        error: () => {
           this.toastrService.error("API error", "Error");
         }
       })

src/app/chat/chat.module.ts

@@ -13,6 +13,10 @@ import { MatBadgeModule } from '@angular/material/badge';
 import { MatButtonModule } from '@angular/material/button';
 import { MatTooltipModule } from '@angular/material/tooltip';
 import { MatIconModule } from '@angular/material/icon';
+import { MessageBarComponent } from './chat/message-bar/message-bar.component';
+import { MatFormFieldModule } from '@angular/material/form-field';
+import { MatInputModule } from '@angular/material/input';
+import { ReactiveFormsModule } from '@angular/forms';
 
 @NgModule({
   declarations: [
@@ -21,7 +25,8 @@ import { MatIconModule } from '@angular/material/icon';
     FeedComponent,
     ChannelEntryComponent,
     MessageComponent,
-    ProfilePictureComponent
+    ProfilePictureComponent,
+    MessageBarComponent
   ],
   imports: [
     CommonModule,
@@ -30,7 +35,10 @@ import { MatIconModule } from '@angular/material/icon';
     MatBadgeModule,
     MatButtonModule,
     MatTooltipModule,
-    MatIconModule
+    MatIconModule,
+    MatFormFieldModule,
+    MatInputModule,
+    ReactiveFormsModule
   ]
 })
 export class ChatModule { }

src/app/chat/chat/chat.component.html

@@ -1,6 +1,9 @@
-<app-toolbar />
-
 <div id="container">
+  <app-toolbar />
+
   <app-channel-list (select)="Select($event)"></app-channel-list>
+
   <app-feed [channel]="this.selectedChannel"></app-feed>
+
+  <app-message-bar [channel]="this.selectedChannel?.id ?? 1"></app-message-bar>
 </div>

src/app/chat/chat/chat.component.scss

@@ -1,5 +1,35 @@
 #container {
-  display: grid;
-  grid-template-columns: minmax(auto, 150px) 1fr;
   height: 100%;
+
+  display: grid;
+  grid-template-columns: 150px 1fr;
+  grid-template-rows: 65px 1fr auto;
+  gap: 0px;
+
+  app-toolbar {
+    grid-column: span 2 / span 2;
+
+  }
+
+  app-channel-list {
+    grid-row: span 2 / span 2;
+    grid-row-start: 2;
+  }
+
+  app-feed {
+    grid-row-start: 2;
+
+    border-left: 2px solid var(--mat-sys-surface-variant);
+    border-top: 2px solid var(--mat-sys-surface-variant);
+    border-radius: 10px 0 0 0;
+
+    background-color: var(--mat-sys-background);
+  }
+
+  app-message-bar {
+    grid-column-start: 2;
+    grid-row-start: 3;
+
+    border-left: 2px solid var(--mat-sys-surface-variant);
+  }
 }

src/app/chat/chat/feed/feed.component.html

@@ -1,4 +1,3 @@
-<app-message
-  *ngFor="let message of this.messages"
-  [message]="message"
-/>
+<div #scrollable id="scrollable">
+  <app-message *ngFor="let message of this.messages" [message]="message" />
+</div>

src/app/chat/chat/feed/feed.component.scss

@@ -1,9 +1,3 @@
 :host {
-  border-left: 2px solid var(--mat-sys-surface-variant);
-  border-top: 2px solid var(--mat-sys-surface-variant);
-  border-radius: 10px 0;
-
-  background-color: var(--mat-sys-background);
-
   overflow-y: scroll;
 }

src/app/chat/chat/feed/feed.component.ts

@@ -1,4 +1,4 @@
-import { Component, Input, OnChanges, OnDestroy } from '@angular/core';
+import { AfterContentInit, AfterViewChecked, AfterViewInit, Component, ElementRef, Input, OnChanges, OnDestroy, ViewChild } from '@angular/core';
 import { Message } from '../../../models/message';
 import { ChatService } from '../../../services/chat.service';
 import { Channel } from '../../../models/channel';
@@ -10,7 +10,7 @@ import { Subscription } from 'rxjs';
   templateUrl: './feed.component.html',
   styleUrl: './feed.component.scss'
 })
-export class FeedComponent implements OnChanges, OnDestroy {
+export class FeedComponent implements OnChanges, OnDestroy, AfterViewInit {
   private readonly DEFAULT_CHANNEL_ID: number = 1;
 
   @Input('channel') public channel?: Channel;
@@ -18,7 +18,11 @@ export class FeedComponent implements OnChanges, OnDestroy {
 
   public subscription?: Subscription;
 
-  constructor(private chatService: ChatService) { }
+  constructor(private chatService: ChatService, private element: ElementRef<HTMLElement>) { }
+
+  ngAfterViewInit(): void {
+    this.scrollToBottom();
+  }
 
   ngOnChanges(): void {
     if (this.subscription) {
@@ -28,7 +32,11 @@ export class FeedComponent implements OnChanges, OnDestroy {
 
     this.subscription =
       this.chatService.GetMessages(this.channel?.id ?? this.DEFAULT_CHANNEL_ID)
-        .subscribe(message => this.messages.push(message));
+        .subscribe(message => {
+          this.messages.push(message);
+
+          if (this.isAtBottom()) this.scrollToBottom();
+        });
   }
 
   ngOnDestroy(): void {
@@ -36,4 +44,13 @@ export class FeedComponent implements OnChanges, OnDestroy {
       this.subscription.unsubscribe();
     }
   }
+
+  private isAtBottom(): boolean {
+    let element = this.element.nativeElement;
+    return Math.abs(element.scrollHeight - element.clientHeight - element.scrollTop) <= 100;
+  }
+
+  private scrollToBottom(): void {
+    setTimeout(() => this.element.nativeElement.scrollTop = this.element.nativeElement.scrollHeight, 100);
+  }
 }

src/app/chat/chat/message-bar/message-bar.component.html

@@ -0,0 +1,12 @@
+<form [formGroup]="messageForm" (submit)="Send()">
+
+  <mat-form-field>
+    <mat-label>Message</mat-label>
+    <textarea type="textarea" required matInput formControlName="content"></textarea>
+  </mat-form-field>
+
+  <button mat-button type="button" (click)="Send()">
+    <mat-icon>send</mat-icon>
+  </button>
+
+</form>

src/app/chat/chat/message-bar/message-bar.component.scss

@@ -0,0 +1,23 @@
+form {
+  align-items: center;
+
+  padding: 10px;
+
+
+  display: grid;
+  grid-template-columns: 1fr auto;
+
+  mat-form-field {
+    padding-top: 5px;
+  }
+}
+
+button {
+  margin: 0 5px;
+  transform: translateY(-10px);
+
+  mat-icon {
+    margin: auto;
+    vertical-align: middle;
+  }
+}

src/app/chat/chat/message-bar/message-bar.component.ts

@@ -0,0 +1,44 @@
+import { Component, Input, OnInit } from '@angular/core';
+import { ChatService } from '../../../services/chat.service';
+import { FormBuilder, FormControl, FormGroup, Validators } from '@angular/forms';
+import { ToastrService } from 'ngx-toastr';
+
+@Component({
+  selector: 'app-message-bar',
+  standalone: false,
+  templateUrl: './message-bar.component.html',
+  styleUrl: './message-bar.component.scss'
+})
+export class MessageBarComponent implements OnInit {
+  private readonly MAX_MESSAGE_LENGTH: number = 120;
+
+  @Input('channel') channel!: number;
+
+  public messageForm!: FormGroup;
+
+  constructor(private chatService: ChatService,
+    private formBuilder: FormBuilder,
+    private toastrService: ToastrService) { }
+
+  ngOnInit(): void {
+    this.messageForm = this.formBuilder.group({
+      content: new FormControl('', [
+        Validators.required,
+        Validators.minLength(1),
+        Validators.maxLength(this.MAX_MESSAGE_LENGTH)
+      ])
+    });
+  }
+
+  public Send(): void {
+    if (this.messageForm.valid) {
+      this.chatService.SendMessage(
+        this.channel,
+        this.messageForm.get("content")!.value).subscribe(
+          {
+            next: () => this.messageForm.setValue({ "content": "" }),
+            error: () => this.toastrService.error("Failed to send message.", "Error")
+          });
+    }
+  }
+}

src/app/services/chat.service.ts

@@ -5,13 +5,16 @@ import { Channel } from '../models/channel';
 import { Message } from '../models/message';
 import { HttpClient } from '@angular/common/http';
 import { environment } from '../../environment/environment';
-import { GetMessagesResponse, ListAvailableChannelsResponse } from './responses/chat';
+import { GetMessagesResponse, ListAvailableChannelsResponse, SendMessageResponse } from './responses/chat';
 
 @Injectable({
   providedIn: 'root'
 })
 export class ChatService {
 
+  private readonly CHANNEL: string = "channel_id";
+  private readonly CONTENT: string = "content";
+
   constructor(private http: HttpClient) { }
 
   public ListAvailableChannels(): Observable<Channel[]> {
@@ -59,4 +62,24 @@ export class ChatService {
       messages.pipe(mergeMap(msgArray => from(msgArray))),
       socket.asObservable());
   }
+
+  public SendMessage(channel: number, content: string): Observable<SendMessageResponse> {
+    let url = `${environment.apiBase}/chat/send`;
+
+    let data = new FormData();
+    data.append(this.CHANNEL, channel.toString());
+    data.append(this.CONTENT, content);
+
+    return this.http.post<SendMessageResponse>(url, data, { withCredentials: true })
+      .pipe(
+        map(response => {
+          if (response.error) {
+            throw new Error(response.error);
+          }
+
+          return response;
+        }),
+        catchError(error => throwError(() => new Error(error.error.message)))
+      );
+  }
 }

src/app/services/responses/chat.ts

@@ -8,4 +8,6 @@ export class ListAvailableChannelsResponse extends APIResponse {
 
 export class GetMessagesResponse extends APIResponse {
   public messages?: Message[];
-}
+}
+
+export class SendMessageResponse extends APIResponse { }

src/environment/environment.ts

@@ -1,4 +1,4 @@
 export const environment = {
   production: false,
-  apiBase: "http://localhost:5000/api"
+  apiBase: "/api"
 }

src/styles.scss

@@ -2,7 +2,7 @@
 
 html,
 body {
-  height: 100%;
+  height: 100dvh;
   margin: 0;
 
   font-family: var(--mat-sys-body-medium-font);