From b4d934ba5ea3c500f26773e8a7a457ddf055f4c3 Mon Sep 17 00:00:00 2001
From: Mariia <maria.gula0307@gmail.com>
Date: Tue, 22 Oct 2024 18:24:42 +0300
Subject: [PATCH] solution

---
 src/App.scss                                  |   4 -
 src/App.tsx                                   | 120 ++++++----
 src/components/CommentsList/CommentsList.tsx  |  37 +++
 src/components/CommentsList/index.ts          |   1 +
 src/components/NewCommentForm.tsx             | 103 ---------
 .../NewCommentForm/NewCommentForm.tsx         | 215 ++++++++++++++++++
 src/components/NewCommentForm/index.ts        |   1 +
 src/components/PostDetails.tsx                | 107 ---------
 src/components/PostDetails/PostDetails.scss   |   3 +
 src/components/PostDetails/PostDetails.tsx    | 100 ++++++++
 src/components/PostDetails/index.ts           |   1 +
 src/components/PostsList.tsx                  |  86 -------
 src/components/PostsList/PostsList.tsx        |  63 +++++
 src/components/PostsList/index.ts             |   1 +
 src/components/UserSelector.tsx               |  42 ----
 src/components/UserSelector/UserSelector.tsx  |  79 +++++++
 src/components/UserSelector/index.ts          |   1 +
 src/index.tsx                                 |   4 +
 src/services/comments.service.ts              |  15 ++
 src/services/index.ts                         |   3 +
 src/services/posts.service.ts                 |   7 +
 src/services/users.service.ts                 |   6 +
 src/types/index.ts                            |   3 +
 src/utils/fetchClient.ts                      |  14 +-
 24 files changed, 627 insertions(+), 389 deletions(-)
 create mode 100644 src/components/CommentsList/CommentsList.tsx
 create mode 100644 src/components/CommentsList/index.ts
 delete mode 100644 src/components/NewCommentForm.tsx
 create mode 100644 src/components/NewCommentForm/NewCommentForm.tsx
 create mode 100644 src/components/NewCommentForm/index.ts
 delete mode 100644 src/components/PostDetails.tsx
 create mode 100644 src/components/PostDetails/PostDetails.scss
 create mode 100644 src/components/PostDetails/PostDetails.tsx
 create mode 100644 src/components/PostDetails/index.ts
 delete mode 100644 src/components/PostsList.tsx
 create mode 100644 src/components/PostsList/PostsList.tsx
 create mode 100644 src/components/PostsList/index.ts
 delete mode 100644 src/components/UserSelector.tsx
 create mode 100644 src/components/UserSelector/UserSelector.tsx
 create mode 100644 src/components/UserSelector/index.ts
 create mode 100644 src/services/comments.service.ts
 create mode 100644 src/services/index.ts
 create mode 100644 src/services/posts.service.ts
 create mode 100644 src/services/users.service.ts
 create mode 100644 src/types/index.ts

diff --git a/src/App.scss b/src/App.scss
index 695435da4..1bb66237b 100644
--- a/src/App.scss
+++ b/src/App.scss
@@ -17,7 +17,3 @@
     }
   }
 }
-
-.message-body {
-  white-space: pre-line;
-}
diff --git a/src/App.tsx b/src/App.tsx
index 017957182..853d65a76 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,60 +1,98 @@
-import classNames from 'classnames';
-
-import 'bulma/css/bulma.css';
-import '@fortawesome/fontawesome-free/css/all.css';
+import { useState } from 'react';
+import cn from 'classnames';
 import './App.scss';
 
+import { User, Post } from './types';
+import { getPosts } from './services';
+
 import { PostsList } from './components/PostsList';
 import { PostDetails } from './components/PostDetails';
 import { UserSelector } from './components/UserSelector';
 import { Loader } from './components/Loader';
 
-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 [selectedUser, setSelectedUser] = useState<User | null>(null);
+  const [posts, setPosts] = useState<Post[]>([]);
+  const [hasPostsLoadingError, setHasPostsLoadingError] = useState(false);
+  const [isLoading, setIsLoading] = useState(false);
+  const [selectedPost, setSelectedPost] = useState<Post | null>(null);
 
-            <div className="block" data-cy="MainContent">
-              <p data-cy="NoSelectedUser">No user selected</p>
+  const showNoPostsYet =
+    !!selectedUser && !isLoading && !hasPostsLoadingError && !posts.length;
 
-              <Loader />
+  const showPostList =
+    !!selectedUser && !isLoading && !hasPostsLoadingError && !!posts.length;
 
-              <div
-                className="notification is-danger"
-                data-cy="PostsLoadingError"
-              >
-                Something went wrong!
-              </div>
+  const handleLoadPosts = (userId: User['id']) => {
+    setIsLoading(true);
+    setHasPostsLoadingError(false);
+    setSelectedPost(null);
+
+    getPosts(userId)
+      .then(setPosts)
+      .catch(() => setHasPostsLoadingError(true))
+      .finally(() => setIsLoading(false));
+  };
 
-              <div className="notification is-warning" data-cy="NoPostsYet">
-                No posts yet
+  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
+                  selectedUser={selectedUser}
+                  onSelectedUser={setSelectedUser}
+                  onLoadPosts={handleLoadPosts}
+                />
               </div>
 
-              <PostsList />
+              <div className="block" data-cy="MainContent">
+                {!selectedUser && (
+                  <p data-cy="NoSelectedUser">No user selected</p>
+                )}
+
+                {isLoading && <Loader />}
+
+                {hasPostsLoadingError && (
+                  <div
+                    className="notification is-danger"
+                    data-cy="PostsLoadingError"
+                  >
+                    Something went wrong!
+                  </div>
+                )}
+
+                {showNoPostsYet && (
+                  <div className="notification is-warning" data-cy="NoPostsYet">
+                    No posts yet
+                  </div>
+                )}
+
+                {showPostList && (
+                  <PostsList
+                    posts={posts}
+                    selectedPost={selectedPost}
+                    onSelectedPost={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={cn('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>
+  );
+};
diff --git a/src/components/CommentsList/CommentsList.tsx b/src/components/CommentsList/CommentsList.tsx
new file mode 100644
index 000000000..8d5371834
--- /dev/null
+++ b/src/components/CommentsList/CommentsList.tsx
@@ -0,0 +1,37 @@
+import { FC } from 'react';
+import { Comment } from '../../types';
+
+interface Props {
+  comments: Comment[];
+  onDeleteComment: (commentId: Comment['id']) => void;
+}
+
+export const CommentsList: FC<Props> = ({ comments, onDeleteComment }) => {
+  return (
+    <>
+      <p className="title is-4">Comments:</p>
+
+      {comments.map(({ id, email, name, body }) => (
+        <article key={id} className="message is-small" data-cy="Comment">
+          <div className="message-header">
+            <a href={`mailto:${email}`} data-cy="CommentAuthor">
+              {name}
+            </a>
+
+            <button
+              data-cy="CommentDelete"
+              type="button"
+              className="delete is-small"
+              aria-label="delete"
+              onClick={() => onDeleteComment(id)}
+            />
+          </div>
+
+          <div className="message-body" data-cy="CommentBody">
+            {body}
+          </div>
+        </article>
+      ))}
+    </>
+  );
+};
diff --git a/src/components/CommentsList/index.ts b/src/components/CommentsList/index.ts
new file mode 100644
index 000000000..9e1d3ca5f
--- /dev/null
+++ b/src/components/CommentsList/index.ts
@@ -0,0 +1 @@
+export * from './CommentsList';
diff --git a/src/components/NewCommentForm.tsx b/src/components/NewCommentForm.tsx
deleted file mode 100644
index 73a8a0b45..000000000
--- a/src/components/NewCommentForm.tsx
+++ /dev/null
@@ -1,103 +0,0 @@
-import React from 'react';
-
-export const NewCommentForm: React.FC = () => {
-  return (
-    <form data-cy="NewCommentForm">
-      <div className="field" data-cy="NameField">
-        <label className="label" htmlFor="comment-author-name">
-          Author Name
-        </label>
-
-        <div className="control has-icons-left has-icons-right">
-          <input
-            type="text"
-            name="name"
-            id="comment-author-name"
-            placeholder="Name Surname"
-            className="input is-danger"
-          />
-
-          <span className="icon is-small is-left">
-            <i className="fas fa-user" />
-          </span>
-
-          <span
-            className="icon is-small is-right has-text-danger"
-            data-cy="ErrorIcon"
-          >
-            <i className="fas fa-exclamation-triangle" />
-          </span>
-        </div>
-
-        <p className="help is-danger" data-cy="ErrorMessage">
-          Name is required
-        </p>
-      </div>
-
-      <div className="field" data-cy="EmailField">
-        <label className="label" htmlFor="comment-author-email">
-          Author Email
-        </label>
-
-        <div className="control has-icons-left has-icons-right">
-          <input
-            type="text"
-            name="email"
-            id="comment-author-email"
-            placeholder="email@test.com"
-            className="input is-danger"
-          />
-
-          <span className="icon is-small is-left">
-            <i className="fas fa-envelope" />
-          </span>
-
-          <span
-            className="icon is-small is-right has-text-danger"
-            data-cy="ErrorIcon"
-          >
-            <i className="fas fa-exclamation-triangle" />
-          </span>
-        </div>
-
-        <p className="help is-danger" data-cy="ErrorMessage">
-          Email is required
-        </p>
-      </div>
-
-      <div className="field" data-cy="BodyField">
-        <label className="label" htmlFor="comment-body">
-          Comment Text
-        </label>
-
-        <div className="control">
-          <textarea
-            id="comment-body"
-            name="body"
-            placeholder="Type comment here"
-            className="textarea is-danger"
-          />
-        </div>
-
-        <p className="help is-danger" data-cy="ErrorMessage">
-          Enter some text
-        </p>
-      </div>
-
-      <div className="field is-grouped">
-        <div className="control">
-          <button type="submit" className="button is-link is-loading">
-            Add
-          </button>
-        </div>
-
-        <div className="control">
-          {/* eslint-disable-next-line react/button-has-type */}
-          <button type="reset" className="button is-link is-light">
-            Clear
-          </button>
-        </div>
-      </div>
-    </form>
-  );
-};
diff --git a/src/components/NewCommentForm/NewCommentForm.tsx b/src/components/NewCommentForm/NewCommentForm.tsx
new file mode 100644
index 000000000..ac0a3f306
--- /dev/null
+++ b/src/components/NewCommentForm/NewCommentForm.tsx
@@ -0,0 +1,215 @@
+import {
+  FC,
+  ChangeEvent,
+  FormEvent,
+  useState,
+  Dispatch,
+  SetStateAction,
+} from 'react';
+import cn from 'classnames';
+
+import { Comment, Post } from '../../types/';
+import { addComment } from '../../services';
+
+interface Props {
+  postId: Post['id'];
+  setComments: Dispatch<SetStateAction<Comment[]>>;
+}
+
+export const NewCommentForm: FC<Props> = ({ postId, setComments }) => {
+  const [nameQuery, setNameQuery] = useState('');
+  const [hasNameError, setHasNameError] = useState(false);
+  const [emailQuery, setEmailQuery] = useState('');
+  const [hasEmailError, setHasEmailError] = useState(false);
+  const [bodyQuery, setBodyQuery] = useState('');
+  const [hasBodyError, setHasBodyError] = useState(false);
+  const [isLoading, setIsLoading] = useState(false);
+
+  const handleNameInputChange = (event: ChangeEvent<HTMLInputElement>) => {
+    setHasNameError(false);
+    setNameQuery(event.target.value.trimStart());
+  };
+
+  const handleEmailInputChange = (event: ChangeEvent<HTMLInputElement>) => {
+    setHasEmailError(false);
+    setEmailQuery(event.target.value.trimStart());
+  };
+
+  const handleBodyTextareaChange = (
+    event: ChangeEvent<HTMLTextAreaElement>,
+  ) => {
+    setHasBodyError(false);
+    setBodyQuery(event.target.value.trimStart());
+  };
+
+  const handleClearForm = () => {
+    setNameQuery('');
+    setHasNameError(false);
+    setEmailQuery('');
+    setHasEmailError(false);
+    setBodyQuery('');
+    setHasBodyError(false);
+  };
+
+  const handleSubmit = (event: FormEvent<HTMLFormElement>) => {
+    event.preventDefault();
+    setIsLoading(true);
+
+    const trimmedNameQuery = nameQuery.trim();
+    const trimmedEmailQuery = emailQuery.trim();
+    const trimmedBodyQuery = bodyQuery.trim();
+
+    setHasNameError(!trimmedNameQuery);
+    setHasEmailError(!trimmedEmailQuery);
+    setHasBodyError(!trimmedBodyQuery);
+
+    if (!trimmedNameQuery || !trimmedEmailQuery || !trimmedBodyQuery) {
+      setIsLoading(false);
+
+      return;
+    }
+
+    addComment({
+      postId: postId,
+      name: trimmedNameQuery,
+      email: trimmedEmailQuery,
+      body: trimmedBodyQuery,
+    })
+      .then(newComment =>
+        setComments(currentComments => [...currentComments, newComment]),
+      )
+      .finally(() => setIsLoading(false));
+
+    setBodyQuery('');
+  };
+
+  return (
+    <form data-cy="NewCommentForm" onSubmit={handleSubmit}>
+      <div className="field" data-cy="NameField">
+        <label className="label" htmlFor="comment-author-name">
+          Author Name
+        </label>
+
+        <div className="control has-icons-left has-icons-right">
+          <input
+            type="text"
+            name="name"
+            id="comment-author-name"
+            placeholder="Name Surname"
+            value={nameQuery}
+            onChange={handleNameInputChange}
+            className={cn('input', {
+              'is-danger': hasNameError,
+            })}
+          />
+
+          <span className="icon is-small is-left">
+            <i className="fas fa-user" />
+          </span>
+
+          {hasNameError && (
+            <span
+              className="icon is-small is-right has-text-danger"
+              data-cy="ErrorIcon"
+            >
+              <i className="fas fa-exclamation-triangle" />
+            </span>
+          )}
+        </div>
+
+        {hasNameError && (
+          <p className="help is-danger" data-cy="ErrorMessage">
+            Name is required
+          </p>
+        )}
+      </div>
+
+      <div className="field" data-cy="EmailField">
+        <label className="label" htmlFor="comment-author-email">
+          Author Email
+        </label>
+
+        <div className="control has-icons-left has-icons-right">
+          <input
+            type="text"
+            name="email"
+            id="comment-author-email"
+            placeholder="email@test.com"
+            value={emailQuery}
+            onChange={handleEmailInputChange}
+            className={cn('input', {
+              'is-danger': hasEmailError,
+            })}
+          />
+
+          <span className="icon is-small is-left">
+            <i className="fas fa-envelope" />
+          </span>
+
+          {hasEmailError && (
+            <span
+              className="icon is-small is-right has-text-danger"
+              data-cy="ErrorIcon"
+            >
+              <i className="fas fa-exclamation-triangle" />
+            </span>
+          )}
+        </div>
+
+        {hasEmailError && (
+          <p className="help is-danger" data-cy="ErrorMessage">
+            Email is required
+          </p>
+        )}
+      </div>
+
+      <div className="field" data-cy="BodyField">
+        <label className="label" htmlFor="comment-body">
+          Comment Text
+        </label>
+
+        <div className="control">
+          <textarea
+            id="comment-body"
+            name="body"
+            placeholder="Type comment here"
+            value={bodyQuery}
+            onChange={handleBodyTextareaChange}
+            className={cn('textarea', {
+              'is-danger': hasBodyError,
+            })}
+          />
+        </div>
+
+        {hasBodyError && (
+          <p className="help is-danger" data-cy="ErrorMessage">
+            Enter some text
+          </p>
+        )}
+      </div>
+
+      <div className="field is-grouped">
+        <div className="control">
+          <button
+            type="submit"
+            className={cn('button is-link', {
+              'is-loading': isLoading,
+            })}
+          >
+            Add
+          </button>
+        </div>
+
+        <div className="control">
+          <button
+            type="reset"
+            className="button is-link is-light"
+            onClick={handleClearForm}
+          >
+            Clear
+          </button>
+        </div>
+      </div>
+    </form>
+  );
+};
diff --git a/src/components/NewCommentForm/index.ts b/src/components/NewCommentForm/index.ts
new file mode 100644
index 000000000..49cd052cd
--- /dev/null
+++ b/src/components/NewCommentForm/index.ts
@@ -0,0 +1 @@
+export * from './NewCommentForm';
diff --git a/src/components/PostDetails.tsx b/src/components/PostDetails.tsx
deleted file mode 100644
index 2f82db916..000000000
--- a/src/components/PostDetails.tsx
+++ /dev/null
@@ -1,107 +0,0 @@
-import React from 'react';
-import { Loader } from './Loader';
-import { NewCommentForm } from './NewCommentForm';
-
-export const PostDetails: React.FC = () => {
-  return (
-    <div className="content" data-cy="PostDetails">
-      <div className="content" data-cy="PostDetails">
-        <div className="block">
-          <h2 data-cy="PostTitle">
-            #18: voluptate et itaque vero tempora molestiae
-          </h2>
-
-          <p data-cy="PostBody">
-            eveniet quo quis laborum totam consequatur non dolor ut et est
-            repudiandae est voluptatem vel debitis et magnam
-          </p>
-        </div>
-
-        <div className="block">
-          <Loader />
-
-          <div className="notification is-danger" data-cy="CommentsError">
-            Something went wrong
-          </div>
-
-          <p className="title is-4" data-cy="NoCommentsMessage">
-            No comments yet
-          </p>
-
-          <p className="title is-4">Comments:</p>
-
-          <article className="message is-small" data-cy="Comment">
-            <div className="message-header">
-              <a href="mailto:misha@mate.academy" data-cy="CommentAuthor">
-                Misha Hrynko
-              </a>
-              <button
-                data-cy="CommentDelete"
-                type="button"
-                className="delete is-small"
-                aria-label="delete"
-              >
-                delete button
-              </button>
-            </div>
-
-            <div className="message-body" data-cy="CommentBody">
-              Some comment
-            </div>
-          </article>
-
-          <article className="message is-small" data-cy="Comment">
-            <div className="message-header">
-              <a href="mailto:misha@mate.academy" data-cy="CommentAuthor">
-                Misha Hrynko
-              </a>
-
-              <button
-                data-cy="CommentDelete"
-                type="button"
-                className="delete is-small"
-                aria-label="delete"
-              >
-                delete button
-              </button>
-            </div>
-            <div className="message-body" data-cy="CommentBody">
-              One more comment
-            </div>
-          </article>
-
-          <article className="message is-small" data-cy="Comment">
-            <div className="message-header">
-              <a href="mailto:misha@mate.academy" data-cy="CommentAuthor">
-                Misha Hrynko
-              </a>
-
-              <button
-                data-cy="CommentDelete"
-                type="button"
-                className="delete is-small"
-                aria-label="delete"
-              >
-                delete button
-              </button>
-            </div>
-
-            <div className="message-body" data-cy="CommentBody">
-              {'Multi\nline\ncomment'}
-            </div>
-          </article>
-
-          <button
-            data-cy="WriteCommentButton"
-            type="button"
-            className="button is-link"
-          >
-            Write a comment
-          </button>
-        </div>
-
-        <NewCommentForm />
-      </div>
-    </div>
-  );
-};
diff --git a/src/components/PostDetails/PostDetails.scss b/src/components/PostDetails/PostDetails.scss
new file mode 100644
index 000000000..3745e2232
--- /dev/null
+++ b/src/components/PostDetails/PostDetails.scss
@@ -0,0 +1,3 @@
+.message-body {
+  white-space: pre-line;
+}
diff --git a/src/components/PostDetails/PostDetails.tsx b/src/components/PostDetails/PostDetails.tsx
new file mode 100644
index 000000000..8a1de0d42
--- /dev/null
+++ b/src/components/PostDetails/PostDetails.tsx
@@ -0,0 +1,100 @@
+import { FC, useEffect, useState } from 'react';
+import './PostDetails.scss';
+
+import { Post, Comment } from '../../types';
+import { deleteComment, getCommentsByPostId } from '../../services';
+
+import { Loader } from '../Loader';
+import { NewCommentForm } from '../NewCommentForm';
+import { CommentsList } from '../CommentsList';
+
+interface Props {
+  post: Post;
+}
+
+export const PostDetails: FC<Props> = ({ post }) => {
+  const { id, title, body } = post;
+  const [comments, setComments] = useState<Comment[]>([]);
+  const [isLoading, setIsLoading] = useState(false);
+  const [hasCommentsError, setHasCommentsError] = useState(false);
+  const [showNewCommentForm, setShowNewCommentForm] = useState(false);
+
+  const showNoCommentsMessage =
+    !isLoading && !hasCommentsError && !comments.length;
+
+  const showComments = !isLoading && !hasCommentsError && !!comments.length;
+
+  const showWriteCommentButton =
+    !isLoading && !showNewCommentForm && !hasCommentsError;
+
+  const handleDeleteComment = (commentId: Comment['id']) => {
+    deleteComment(commentId).then(() =>
+      setComments(currentComments =>
+        currentComments.filter(comment => comment.id !== commentId),
+      ),
+    );
+  };
+
+  useEffect(() => {
+    setIsLoading(true);
+
+    getCommentsByPostId(id)
+      .then(setComments)
+      .catch(() => setHasCommentsError(true))
+      .finally(() => setIsLoading(false));
+  }, [id]);
+
+  useEffect(() => setShowNewCommentForm(false), [id]);
+
+  return (
+    <div className="content" data-cy="PostDetails">
+      <div className="content" data-cy="PostDetails">
+        <div className="block">
+          <h2 data-cy="PostTitle">
+            #{id}: {title}
+          </h2>
+
+          <p data-cy="PostBody">{body}</p>
+        </div>
+
+        <div className="block">
+          {isLoading && <Loader />}
+
+          {hasCommentsError && (
+            <div className="notification is-danger" data-cy="CommentsError">
+              Something went wrong
+            </div>
+          )}
+
+          {showNoCommentsMessage && (
+            <p className="title is-4" data-cy="NoCommentsMessage">
+              No comments yet
+            </p>
+          )}
+
+          {showComments && (
+            <CommentsList
+              comments={comments}
+              onDeleteComment={handleDeleteComment}
+            />
+          )}
+
+          {showWriteCommentButton && (
+            <button
+              data-cy="WriteCommentButton"
+              type="button"
+              className="button is-link"
+              onClick={() => setShowNewCommentForm(true)}
+            >
+              Write a comment
+            </button>
+          )}
+        </div>
+
+        {showNewCommentForm && (
+          <NewCommentForm postId={id} setComments={setComments} />
+        )}
+      </div>
+    </div>
+  );
+};
diff --git a/src/components/PostDetails/index.ts b/src/components/PostDetails/index.ts
new file mode 100644
index 000000000..d0d5ae35c
--- /dev/null
+++ b/src/components/PostDetails/index.ts
@@ -0,0 +1 @@
+export * from './PostDetails';
diff --git a/src/components/PostsList.tsx b/src/components/PostsList.tsx
deleted file mode 100644
index cf90f04b0..000000000
--- a/src/components/PostsList.tsx
+++ /dev/null
@@ -1,86 +0,0 @@
-import React from 'react';
-
-export const PostsList: React.FC = () => (
-  <div data-cy="PostsList">
-    <p className="title">Posts:</p>
-
-    <table className="table is-fullwidth is-striped is-hoverable is-narrow">
-      <thead>
-        <tr className="has-background-link-light">
-          <th>#</th>
-          <th>Title</th>
-          {/* eslint-disable-next-line jsx-a11y/control-has-associated-label */}
-          <th> </th>
-        </tr>
-      </thead>
-
-      <tbody>
-        <tr data-cy="Post">
-          <td data-cy="PostId">17</td>
-
-          <td data-cy="PostTitle">
-            fugit voluptas sed molestias voluptatem provident
-          </td>
-
-          <td className="has-text-right is-vcentered">
-            <button
-              type="button"
-              data-cy="PostButton"
-              className="button is-link is-light"
-            >
-              Open
-            </button>
-          </td>
-        </tr>
-
-        <tr data-cy="Post">
-          <td data-cy="PostId">18</td>
-
-          <td data-cy="PostTitle">
-            voluptate et itaque vero tempora molestiae
-          </td>
-
-          <td className="has-text-right is-vcentered">
-            <button
-              type="button"
-              data-cy="PostButton"
-              className="button is-link"
-            >
-              Close
-            </button>
-          </td>
-        </tr>
-
-        <tr data-cy="Post">
-          <td data-cy="PostId">19</td>
-          <td data-cy="PostTitle">adipisci placeat illum aut reiciendis qui</td>
-
-          <td className="has-text-right is-vcentered">
-            <button
-              type="button"
-              data-cy="PostButton"
-              className="button is-link is-light"
-            >
-              Open
-            </button>
-          </td>
-        </tr>
-
-        <tr data-cy="Post">
-          <td data-cy="PostId">20</td>
-          <td data-cy="PostTitle">doloribus ad provident suscipit at</td>
-
-          <td className="has-text-right is-vcentered">
-            <button
-              type="button"
-              data-cy="PostButton"
-              className="button is-link is-light"
-            >
-              Open
-            </button>
-          </td>
-        </tr>
-      </tbody>
-    </table>
-  </div>
-);
diff --git a/src/components/PostsList/PostsList.tsx b/src/components/PostsList/PostsList.tsx
new file mode 100644
index 000000000..58d94bb1c
--- /dev/null
+++ b/src/components/PostsList/PostsList.tsx
@@ -0,0 +1,63 @@
+import { FC } from 'react';
+import cn from 'classnames';
+
+import { Post } from '../../types';
+
+interface Props {
+  posts: Post[];
+  selectedPost: Post | null;
+  onSelectedPost: (post: Post | null) => void;
+}
+
+export const PostsList: FC<Props> = ({
+  posts,
+  selectedPost,
+  onSelectedPost,
+}) => {
+  const handleToggleSelectPost = (post: Post) =>
+    selectedPost === post ? onSelectedPost(null) : onSelectedPost(post);
+
+  return (
+    <div data-cy="PostsList">
+      <p className="title">Posts:</p>
+
+      <table className="table is-fullwidth is-striped is-hoverable is-narrow">
+        <thead>
+          <tr className="has-background-link-light">
+            <th>#</th>
+            <th>Title</th>
+            <th> </th>
+          </tr>
+        </thead>
+
+        <tbody>
+          {posts.map(post => {
+            const { id, title } = post;
+            const isSelectedCurrentPost = selectedPost?.id === id;
+
+            return (
+              <tr key={id} data-cy="Post">
+                <td data-cy="PostId">{id}</td>
+
+                <td data-cy="PostTitle">{title}</td>
+
+                <td className="has-text-right is-vcentered">
+                  <button
+                    type="button"
+                    data-cy="PostButton"
+                    className={cn('button is-link', {
+                      'is-light': !isSelectedCurrentPost,
+                    })}
+                    onClick={() => handleToggleSelectPost(post)}
+                  >
+                    {isSelectedCurrentPost ? 'Close' : 'Open'}
+                  </button>
+                </td>
+              </tr>
+            );
+          })}
+        </tbody>
+      </table>
+    </div>
+  );
+};
diff --git a/src/components/PostsList/index.ts b/src/components/PostsList/index.ts
new file mode 100644
index 000000000..41c5eee64
--- /dev/null
+++ b/src/components/PostsList/index.ts
@@ -0,0 +1 @@
+export * from './PostsList';
diff --git a/src/components/UserSelector.tsx b/src/components/UserSelector.tsx
deleted file mode 100644
index c89442841..000000000
--- a/src/components/UserSelector.tsx
+++ /dev/null
@@ -1,42 +0,0 @@
-import React from 'react';
-
-export const UserSelector: React.FC = () => {
-  return (
-    <div data-cy="UserSelector" className="dropdown is-active">
-      <div className="dropdown-trigger">
-        <button
-          type="button"
-          className="button"
-          aria-haspopup="true"
-          aria-controls="dropdown-menu"
-        >
-          <span>Choose a user</span>
-
-          <span className="icon is-small">
-            <i className="fas fa-angle-down" aria-hidden="true" />
-          </span>
-        </button>
-      </div>
-
-      <div className="dropdown-menu" id="dropdown-menu" role="menu">
-        <div className="dropdown-content">
-          <a href="#user-1" className="dropdown-item">
-            Leanne Graham
-          </a>
-          <a href="#user-2" className="dropdown-item is-active">
-            Ervin Howell
-          </a>
-          <a href="#user-3" className="dropdown-item">
-            Clementine Bauch
-          </a>
-          <a href="#user-4" className="dropdown-item">
-            Patricia Lebsack
-          </a>
-          <a href="#user-5" className="dropdown-item">
-            Chelsey Dietrich
-          </a>
-        </div>
-      </div>
-    </div>
-  );
-};
diff --git a/src/components/UserSelector/UserSelector.tsx b/src/components/UserSelector/UserSelector.tsx
new file mode 100644
index 000000000..74c2d1682
--- /dev/null
+++ b/src/components/UserSelector/UserSelector.tsx
@@ -0,0 +1,79 @@
+import { FC, useEffect, useState } from 'react';
+import cn from 'classnames';
+
+import { User } from '../../types';
+import { getUsers } from '../../services';
+
+interface Props {
+  selectedUser: User | null;
+  onSelectedUser: (user: User | null) => void;
+  onLoadPosts: (userId: User['id']) => void;
+}
+
+export const UserSelector: FC<Props> = ({
+  selectedUser,
+  onSelectedUser,
+  onLoadPosts,
+}) => {
+  const [users, setUsers] = useState<User[]>([]);
+  const [isActiveDropdown, setIsActiveDropdown] = useState(false);
+
+  const handleSelectUser = (user: User) => {
+    onSelectedUser(user);
+    setIsActiveDropdown(false);
+    onLoadPosts(user.id);
+  };
+
+  useEffect(() => {
+    getUsers()
+      .then(setUsers)
+      .catch(() => {});
+  }, []);
+
+  return (
+    <div
+      data-cy="UserSelector"
+      className={cn('dropdown', {
+        'is-active': isActiveDropdown,
+      })}
+    >
+      <div className="dropdown-trigger">
+        <button
+          type="button"
+          className="button"
+          aria-haspopup="true"
+          aria-controls="dropdown-menu"
+          onClick={() => setIsActiveDropdown(current => !current)}
+          onBlur={() => setIsActiveDropdown(false)}
+        >
+          <span>{selectedUser ? selectedUser.name : 'Choose a user'}</span>
+
+          <span className="icon is-small">
+            <i className="fas fa-angle-down" aria-hidden="true" />
+          </span>
+        </button>
+      </div>
+
+      <div className="dropdown-menu" id="dropdown-menu" role="menu">
+        <div className="dropdown-content">
+          {users.map(user => {
+            const { id, name } = user;
+
+            return (
+              <a
+                key={id}
+                href={`#user-${id}`}
+                className={cn('dropdown-item', {
+                  'is-active': selectedUser?.id === id,
+                })}
+                onMouseDown={() => handleSelectUser(user)}
+              >
+                {name}
+              </a>
+            );
+          })}
+        </div>
+      </div>
+    </div>
+  );
+};
diff --git a/src/components/UserSelector/index.ts b/src/components/UserSelector/index.ts
new file mode 100644
index 000000000..b4431162a
--- /dev/null
+++ b/src/components/UserSelector/index.ts
@@ -0,0 +1 @@
+export * from './UserSelector';
diff --git a/src/index.tsx b/src/index.tsx
index 50470f150..bd953b189 100644
--- a/src/index.tsx
+++ b/src/index.tsx
@@ -1,4 +1,8 @@
 import { createRoot } from 'react-dom/client';
+
+import 'bulma/css/bulma.css';
+import '@fortawesome/fontawesome-free/css/all.css';
+
 import { App } from './App';
 
 createRoot(document.getElementById('root') as HTMLElement).render(<App />);
diff --git a/src/services/comments.service.ts b/src/services/comments.service.ts
new file mode 100644
index 000000000..fbe46d3fd
--- /dev/null
+++ b/src/services/comments.service.ts
@@ -0,0 +1,15 @@
+import { Comment } from '../types/Comment';
+import { Post } from '../types/Post';
+import { client } from '../utils/fetchClient';
+
+export const getCommentsByPostId = (postId: Post['id']) => {
+  return client.get<Comment[]>(`/comments?postId=${postId}`);
+};
+
+export const addComment = (newComment: Omit<Comment, 'id'>) => {
+  return client.post<Comment>('/comments', newComment);
+};
+
+export const deleteComment = (commentId: Comment['id']) => {
+  return client.delete(`/comments/${commentId}`);
+};
diff --git a/src/services/index.ts b/src/services/index.ts
new file mode 100644
index 000000000..9c049e7bd
--- /dev/null
+++ b/src/services/index.ts
@@ -0,0 +1,3 @@
+export * from './users.service';
+export * from './posts.service';
+export * from './comments.service';
diff --git a/src/services/posts.service.ts b/src/services/posts.service.ts
new file mode 100644
index 000000000..b06958ebf
--- /dev/null
+++ b/src/services/posts.service.ts
@@ -0,0 +1,7 @@
+import { Post } from '../types/Post';
+import { User } from '../types/User';
+import { client } from '../utils/fetchClient';
+
+export const getPosts = (userId: User['id']) => {
+  return client.get<Post[]>(`/posts?userId=${userId}`);
+};
diff --git a/src/services/users.service.ts b/src/services/users.service.ts
new file mode 100644
index 000000000..816c8274b
--- /dev/null
+++ b/src/services/users.service.ts
@@ -0,0 +1,6 @@
+import { User } from '../types/User';
+import { client } from '../utils/fetchClient';
+
+export const getUsers = () => {
+  return client.get<User[]>('/users');
+};
diff --git a/src/types/index.ts b/src/types/index.ts
new file mode 100644
index 000000000..81d40b3af
--- /dev/null
+++ b/src/types/index.ts
@@ -0,0 +1,3 @@
+export * from './User';
+export * from './Post';
+export * from './Comment';
diff --git a/src/utils/fetchClient.ts b/src/utils/fetchClient.ts
index feb6915ce..6d5e913e4 100644
--- a/src/utils/fetchClient.ts
+++ b/src/utils/fetchClient.ts
@@ -1,35 +1,37 @@
 /* eslint-disable @typescript-eslint/no-explicit-any */
 const BASE_URL = 'https://mate.academy/students-api';
 
-// a promise resolved after a given delay
 function wait(delay: number) {
   return new Promise(resolve => {
     setTimeout(resolve, delay);
   });
 }
 
-// To have autocompletion and avoid mistypes
 type RequestMethod = 'GET' | 'POST' | 'PATCH' | 'DELETE';
 
 function request<T>(
   url: string,
   method: RequestMethod = 'GET',
-  data: any = null, // we can send any data to the server
+  data: any = null,
 ): Promise<T> {
   const options: RequestInit = { method };
 
   if (data) {
-    // We add body and Content-Type only for the requests with data
     options.body = JSON.stringify(data);
     options.headers = {
       'Content-Type': 'application/json; charset=UTF-8',
     };
   }
 
-  // for a demo purpose we emulate a delay to see if Loaders work
   return wait(300)
     .then(() => fetch(BASE_URL + url, options))
-    .then(response => response.json());
+    .then(response => {
+      if (!response.ok) {
+        throw new Error();
+      }
+
+      return response.json();
+    });
 }
 
 export const client = {