likes

src/app/services/data/post.service.ts

@@ -4,39 +4,49 @@ import { AuthService } from '../auth/auth.service';
 import { AngularFirestore, Reference } from '@angular/fire/compat/firestore';
 import { User } from '../../../model/User';
 import { UserService } from './user.service';
-import { user } from '@angular/fire/auth';
+import { DocumentReference } from '@angular/fire/firestore';
 
 @Injectable({
   providedIn: 'root'
 })
 export class PostService {
-  constructor(private auth: AuthService, private afs: AngularFirestore) { }
+  constructor(private auth: AuthService, private afs: AngularFirestore, private usersvc: UserService) { }
 
   getFeed(length: Number, start: Number): Promise<Array<Post>> {
     return new Promise<Array<Post>>((resolve, reject) => {
-      let posts = Array<Post>();
+      let result = Array<Post>();
 
       if (this.auth.checkAllowed()) {
-        this.afs.collection<Post>('post').valueChanges({idField: 'id'}).subscribe(data => {
+        this.usersvc.getCurrentUser()
-          data.forEach(i => {
+          .then(currentUser => {
-            this.afs.doc((i as any).user).valueChanges().subscribe(user => {
+            // get posts
-              posts.push({
+            this.afs.collection<Post>('post').valueChanges({ idField: 'id' }).subscribe(posts => {
+              posts.forEach(post => {
+                // get the user who made this post
+                this.afs.doc((post as any).user).valueChanges().subscribe(user => {
+                  // get how many likes it has
+                  this.afs.collection('like', ref => ref.where('post', '==', this.afs.doc('/post/' + post.id).ref)).valueChanges().subscribe(likes => {
+                    // check if we liked this post
+                    let liked: boolean = likes.filter(like => (like as any).user.id == currentUser.username).length != 0;
+                    result.push({
                       user: {
                         username: (user as User).username,
                         email: (user as User).email,
                         picture: (user as User).picture,
                         followed: (user as User).followed
                       },
-                content: i.content,
+                      content: post.content,
-                image: i.image,
+                      image: post.image,
-                likes: i.likes,
+                      likes: likes.length,
-                liked: i.liked,
+                      liked: liked,
-                id: i.id
+                      id: post.id
+                    })
                   })
                 });
               });
-          resolve(posts);
+              resolve(result);
             });
+          })
       } else {
         reject()
       }
@@ -48,24 +58,42 @@ export class PostService {
       if (this.auth.checkAllowed()) {
         if (username == undefined) {
           this.auth.getUser().subscribe(cred => {
+            // get the user by id
             this.afs.collection<User>('user', ref => ref.where('id', '==', cred?.uid)).valueChanges().subscribe(user => {
-              this.afs.collection<Post>('post', ref => ref.where('user', '==', this.afs.doc('/user/' + user[0].username).ref)).valueChanges({idField:'id'}).subscribe(data => {
+              // get their posts
-                data.forEach(i => {
+              this.afs.collection<Post>('post', ref => ref.where('user', '==', this.afs.doc('/user/' + user[0].username).ref)).valueChanges({ idField: 'id' }).subscribe(posts => {
-                  i.user = user[0] as User;
+                posts.forEach(post => {
+                  // get how many likes it has
+                  this.afs.collection('like', ref => ref.where('post', '==', this.afs.doc('/post/' + post.id).ref)).valueChanges().subscribe(likes => {
+                    // check if we liked this post
+                    post.liked = likes.filter(like => (like as any).user.id == user[0].username).length != 0;
+                    post.user = user[0] as User;
+                    post.likes = likes.length;
+                  })
+                  resolve(posts)
                 })
-                resolve(data)
               });
             })
           });
         } else {
+          this.usersvc.getCurrentUser()
+            .then(currentUser => {
+              // get the user by username
               this.afs.collection<User>('user').doc(username as string).valueChanges().subscribe(user => {
-            this.afs.collection<Post>('post', ref => ref.where('user', '==', this.afs.doc('/user/' + username).ref)).valueChanges({idField:'id'}).subscribe(data => {
+                // get their posts
-              data.forEach(i => {
+                this.afs.collection<Post>('post', ref => ref.where('user', '==', this.afs.doc('/user/' + username).ref)).valueChanges({ idField: 'id' }).subscribe(posts => {
-                i.user = user as User;
+                  posts.forEach(post => {
+                    // get how many likes it has
+                    this.afs.collection('like', ref => ref.where('post', '==', this.afs.doc('/post/' + post.id).ref)).valueChanges().subscribe(likes => {
+                      post.liked = likes.filter(like => (like as any).user.id == currentUser.username).length != 0;
+                      post.user = user as User;
+                      post.likes = likes.length;
+                    })
+                    resolve(posts)
                   })
-              resolve(data)
                 });
               });
+            })
         }
       } else {
         reject()
@@ -98,4 +126,35 @@ export class PostService {
   removePost(id: String) {
     return this.afs.doc('/post/' + id).delete();
   }
+
+  toggleLike(postId: String): Promise<boolean> {
+    return new Promise<boolean>((resolve, reject) => {
+      if (this.auth.checkAllowed()) {
+        this.usersvc.getCurrentUser()
+          .then(user => {
+            let userRef = this.afs.doc('/user/' + user.username).ref;
+            let postRef = this.afs.doc('/post/' + postId).ref;
+            this.afs.collection('like', ref => ref.where('user', '==', userRef).where('post', '==', postRef)).get().subscribe(likes => {
+              if (likes.docs.length == 0) {
+                // like
+                this.afs.collection('like').add({
+                  user: userRef,
+                  post: postRef
+                })
+                resolve(true);
+              } else {
+                // dislike
+                likes.docs.forEach(likes => {
+                  likes.ref.delete()
+                })
+                resolve(false);
+              }
+            })
+          })
+          .catch(() => reject())
+      } else {
+        reject();
+      }
+    });
+  }
 }

src/app/services/data/user.service.ts

@@ -2,7 +2,6 @@ import { Injectable } from '@angular/core';
 import { User } from '../../../model/User';
 import { AuthService } from '../auth/auth.service';
 import { AngularFirestore } from '@angular/fire/compat/firestore';
-import { user } from '@angular/fire/auth';
 
 @Injectable({
   providedIn: 'root'
@@ -26,6 +25,19 @@ export class UserService {
     });
   }
 
+  getCurrentUser(): Promise<User> {
+    return new Promise<User>((resolve,reject)=>{
+      this.auth.getUser().subscribe(user => {
+        this.afs.collection<User>('user', ref => ref.where('id', '==', user?.uid)).valueChanges().subscribe(users=>{
+          if (users.length != 0)
+            resolve(users[0]);
+          else
+            reject();
+        })
+      });
+    });
+  }
+
   createUser(username: String, email: String, id: String) {
     return new Promise<void>((resolve, reject) => {
       this.afs.collection('user').doc(username as string).set({

src/app/shared/side-menu/side-menu.component.scss

@@ -6,3 +6,12 @@ button {
     display: block;
     margin: 10px auto;
 }
+
+app-side-menu {
+    height: 100%;
+    display: block;
+}
+
+mat-sidenav-container {
+    height: 100%;
+}

src/app/shared/views/large-user/large-user.component.html

@@ -1,6 +1,7 @@
 <div class="user-container outline">
     <div [routerLink]="'/user/'+user?.username">
-        <img [src]="user?.picture" class="outline"> <span>{{user?.username}}</span>
+        <!-- <img [src]="user?.picture" class="outline"> -->
+        <span>{{user?.username}}</span>
     </div>
-    <span [classList]="user?.followed ? 'follow followed' : 'follow'"></span>
+    <!-- <span [classList]="user?.followed ? 'follow followed' : 'follow'"></span> -->
 </div>

src/app/shared/views/large-user/large-user.component.scss

@@ -16,6 +16,7 @@
         }
         
         span {
+            margin: 20px auto;
             display: block;
             width: 100%;
             text-align: center;

src/app/shared/views/post/post.component.html

@@ -3,7 +3,7 @@
     <div>{{post?.content}}</div>
     <img *ngIf="post?.image" [src]="post?.image" alt="">
     <div class="icons">
-        <span [classList]="post?.liked ?  'likes liked' : 'likes'">{{post?.likes}}</span>
+        <span (click)="like()" [classList]="post?.liked ?  'likes liked' : 'likes'">{{post?.likes}}</span>
         <span (click)="remove()" [classList]="isOwned ?  'owned' : ''"></span>
     </div>
 </div>

src/app/shared/views/post/post.component.ts

@@ -14,7 +14,6 @@ import { PostService } from '../../../services/data/post.service';
   styleUrl: './post.component.scss'
 })
 export class PostComponent implements OnInit {
-
   @Input() post: Post | undefined;
 
   isOwned: boolean = false;
@@ -38,4 +37,13 @@ export class PostComponent implements OnInit {
         alert("failed to delete post");
       })
   }
+
+  like() {
+    this.postSv.toggleLike(this.post?.id as String)
+      .then((result)=>{
+        ((this.post as Post).likes as number) += result ? 1 : -1;
+        (this.post as Post).liked = result;
+      })
+      .catch(()=>{alert('failed to toggle like on post')})
+  }
 }

src/app/shared/views/small-user/small-user.component.html

@@ -1,3 +1,4 @@
 <div [routerLink]="'/user/'+user?.username">
-    <img [src]="user?.picture" class="outline"> <span>{{user?.username}}</span>
+    <!-- <img [src]="user?.picture" class="outline"> -->
+    <span>{{user?.username}}</span>
 </div>

src/app/shared/views/small-user/small-user.component.scss

@@ -12,6 +12,7 @@ img {
 
 span {
     display: inline-block;
+    margin: 20px auto;
     padding-left: 10px;
     transform: translateY(-60%);
 }