v1

src/App.scss

@@ -1,3 +1,16 @@
+.tile {
+  &.is-ancestor {
+    display: flex;
+  }
+
+  &.is-parent {
+    display: flex;
+    flex-direction: column;
+    flex-grow: 1;
+    padding: 15px;
+  }
+}
+
 .Sidebar {
   overflow: hidden;
   opacity: 0;

src/App.tsx

@@ -8,53 +8,116 @@ import { PostsList } from './components/PostsList';
 import { PostDetails } from './components/PostDetails';
 import { UserSelector } from './components/UserSelector';
 import { Loader } from './components/Loader';
+import { useEffect, useState } from 'react';
+import { getUsers } from './api/users';
+import { User } from './types/User';
+import { Post } from './types/Post';
+import { getUserPosts } from './api/posts';
 
-export const App = () => (
-  <main className="section">
-    <div className="container">
-      <div className="tile is-ancestor">
-        <div className="tile is-parent">
-          <div className="tile is-child box is-success">
-            <div className="block">
-              <UserSelector />
-            </div>
+export const App = () => {
+  const [loading, setLoading] = useState(false);
+  const [users, setUsers] = useState<User[]>([]);
+  const [selectedUser, setSelectedUser] = useState<User | null>(null);
+  const [posts, setPosts] = useState<Post[]>([]);
+  const [error, setError] = useState('');
+  const [postsFetched, setPostsFetched] = useState(false);
+  const [selectedPost, setSelectedPost] = useState<Post | null>(null);
 
-            <div className="block" data-cy="MainContent">
-              <p data-cy="NoSelectedUser">No user selected</p>
+  useEffect(() => {
+    getUsers().then(fetchedUsers => setUsers(fetchedUsers));
+  }, []);
 
-              <Loader />
+  const handleOpenPosts = (userId: number) => {
+    setLoading(true);
+    setError('');
+    setPostsFetched(false);
 
-              <div
-                className="notification is-danger"
-                data-cy="PostsLoadingError"
-              >
-                Something went wrong!
-              </div>
+    getUserPosts(userId)
+      .then(fetchedPosts => {
+        setPosts(fetchedPosts);
+        setPostsFetched(true);
+      })
+      .catch(() => {
+        setError('Something went wrong!');
+      })
+      .finally(() => {
+        setLoading(false);
+      });
+  };
+
+  useEffect(() => {
+    if (selectedUser) {
+      handleOpenPosts(selectedUser.id);
+      setSelectedPost(null);
+    }
+  }, [selectedUser]);
 
-              <div className="notification is-warning" data-cy="NoPostsYet">
-                No posts yet
+  const isPostEmpty =
+    selectedUser && !loading && posts.length === 0 && !error && postsFetched;
+
+  return (
+    <main className="section">
+      <div className="container">
+        <div className="tile is-ancestor">
+          <div className="tile is-parent">
+            <div className="tile is-child box is-success">
+              <div className="block">
+                <UserSelector
+                  users={users}
+                  selectedUser={selectedUser}
+                  onSelectUser={setSelectedUser}
+                />
               </div>
 
-              <PostsList />
+              <div className="block" data-cy="MainContent">
+                {!selectedUser && (
+                  <p data-cy="NoSelectedUser">No user selected</p>
+                )}
+
+                {loading && <Loader />}
+
+                {error && (
+                  <div
+                    className="notification is-danger"
+                    data-cy="PostsLoadingError"
+                  >
+                    {error}
+                  </div>
+                )}
+
+                {isPostEmpty && (
+                  <div className="notification is-warning" data-cy="NoPostsYet">
+                    No posts yet
+                  </div>
+                )}
+
+                {!error && selectedUser && posts.length > 0 && !loading && (
+                  <PostsList
+                    posts={posts}
+                    selectedPost={selectedPost}
+                    setSelectedPost={setSelectedPost}
+                  />
+                )}
+              </div>
             </div>
           </div>
-        </div>
 
-        <div
-          data-cy="Sidebar"
-          className={classNames(
-            'tile',
-            'is-parent',
-            'is-8-desktop',
-            'Sidebar',
-            'Sidebar--open',
-          )}
-        >
-          <div className="tile is-child box is-success ">
-            <PostDetails />
+          <div
+            data-cy="Sidebar"
+            className={classNames(
+              'tile',
+              'is-parent',
+              'is-8-desktop',
+              'Sidebar',
+              { 'Sidebar--open': selectedPost },
+            )}
+          >
+            <div className="tile is-child box is-success">
+              {selectedPost && <PostDetails post={selectedPost} />}
+            </div>
           </div>
         </div>
       </div>
-    </div>
-  </main>
-);
+    </main>
+  );
+};

src/api/comments.ts

@@ -0,0 +1,24 @@
+import { Comment } from '../types/Comment';
+import { client } from '../utils/fetchClient';
+
+export function getPostComments(postId: number) {
+  return client.get<Comment[]>(`/comments?postId=${postId}`);
+}
+
+export function deleteComment(commentId: number) {
+  return client.delete(`/comments/${commentId}`);
+}
+
+export function addComment({
+  postId,
+  name,
+  email,
+  body,
+}: Omit<Comment, 'id'>): Promise<Comment> {
+  return client.post('/comments', {
+    postId,
+    name,
+    email,
+    body,
+  });
+}

src/api/posts.ts

@@ -0,0 +1,6 @@
+import { Post } from '../types/Post';
+import { client } from '../utils/fetchClient';
+
+export const getUserPosts = (userId: number) => {
+  return client.get<Post[]>(`/posts?userId=${userId}`);
+};

src/api/users.ts

@@ -0,0 +1,6 @@
+import { User } from '../types/User';
+import { client } from '../utils/fetchClient';
+
+export const getUsers = () => {
+  return client.get<User[]>('/users');
+};