From 07d4452f302978593b592b4e1bc5665961cd458e Mon Sep 17 00:00:00 2001
From: OkMoroz <k.moroz.mail@gmail.com>
Date: Thu, 19 Dec 2024 20:32:49 +0200
Subject: [PATCH] added solutions

---
 src/App.tsx                       |  71 ++---------
 src/AppWithContexts.tsx           | 104 ++++++++++++++++
 src/api/comments.ts               |  14 +++
 src/api/posts.ts                  |   6 +
 src/api/users.ts                  |   6 +
 src/components/NewCommentForm.tsx | 169 +++++++++++++++++++++-----
 src/components/PostDetails.tsx    | 196 ++++++++++++++++--------------
 src/components/PostsList.tsx      | 132 +++++++++-----------
 src/components/UserSelector.tsx   |  76 +++++++++---
 src/context/UserContext.tsx       |  25 ++++
 src/types/Comment.ts              |   2 +-
 11 files changed, 527 insertions(+), 274 deletions(-)
 create mode 100644 src/AppWithContexts.tsx
 create mode 100644 src/api/comments.ts
 create mode 100644 src/api/posts.ts
 create mode 100644 src/api/users.ts
 create mode 100644 src/context/UserContext.tsx

diff --git a/src/App.tsx b/src/App.tsx
index 017957182..6ed389b3c 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,60 +1,11 @@
-import classNames from 'classnames';
-
-import 'bulma/css/bulma.css';
-import '@fortawesome/fontawesome-free/css/all.css';
-import './App.scss';
-
-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>
-
-            <div className="block" data-cy="MainContent">
-              <p data-cy="NoSelectedUser">No user selected</p>
-
-              <Loader />
-
-              <div
-                className="notification is-danger"
-                data-cy="PostsLoadingError"
-              >
-                Something went wrong!
-              </div>
-
-              <div className="notification is-warning" data-cy="NoPostsYet">
-                No posts yet
-              </div>
-
-              <PostsList />
-            </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>
-        </div>
-      </div>
-    </div>
-  </main>
-);
+import React from 'react';
+import { UserContextProvider } from './context/UserContext';
+import { AppWithContexts } from './AppWithContexts';
+
+export const App: React.FC = () => {
+  return (
+    <UserContextProvider>
+      <AppWithContexts />
+    </UserContextProvider>
+  );
+};
diff --git a/src/AppWithContexts.tsx b/src/AppWithContexts.tsx
new file mode 100644
index 000000000..2260fabb3
--- /dev/null
+++ b/src/AppWithContexts.tsx
@@ -0,0 +1,104 @@
+import React, { useContext, useEffect, useState } from 'react';
+import 'bulma/bulma.sass';
+import '@fortawesome/fontawesome-free/css/all.css';
+import './App.scss';
+
+import classNames from 'classnames';
+import { PostsList } from './components/PostsList';
+import { PostDetails } from './components/PostDetails';
+import { UserSelector } from './components/UserSelector';
+import { UserContext } from './context/UserContext';
+import { getPosts } from './api/posts';
+import { Post } from './types/Post';
+import { Loader } from './components/Loader';
+
+export const AppWithContexts: React.FC = () => {
+  const selectedUser = useContext(UserContext);
+  const [posts, setPosts] = useState<Post[]>([]);
+  const [error, setError] = useState(false);
+  const [isLoading, setIsLoading] = useState(false);
+  const [selectedPost, setSelectedPost] = useState<Post | null>(null);
+
+  useEffect(() => {
+    if (!selectedUser) {
+      return;
+    }
+
+    setPosts([]);
+    setError(false);
+    setIsLoading(true);
+
+    setSelectedPost(null);
+
+    getPosts(selectedUser.id)
+      .then(setPosts)
+      .catch(() => setError(true))
+      .finally(() => setIsLoading(false));
+  }, [selectedUser]);
+
+  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 />
+              </div>
+
+              <div className="block" data-cy="MainContent">
+                {!selectedUser && (
+                  <p data-cy="NoSelectedUser">No user selected</p>
+                )}
+
+                {selectedUser && isLoading && <Loader />}
+
+                {error && (
+                  <div
+                    className="notification is-danger"
+                    data-cy="PostsLoadingError"
+                  >
+                    Something went wrong!
+                  </div>
+                )}
+
+                {selectedUser &&
+                  !isLoading &&
+                  !error &&
+                  (!posts.length ? (
+                    <div
+                      className="notification is-warning"
+                      data-cy="NoPostsYet"
+                    >
+                      No posts yet
+                    </div>
+                  ) : (
+                    <PostsList
+                      posts={posts}
+                      selectedPost={selectedPost}
+                      setSelectedPost={setSelectedPost}
+                    />
+                  ))}
+              </div>
+            </div>
+          </div>
+
+          <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 selectedPost={selectedPost} />}
+            </div>
+          </div>
+        </div>
+      </div>
+    </main>
+  );
+};
diff --git a/src/api/comments.ts b/src/api/comments.ts
new file mode 100644
index 000000000..03b447eb6
--- /dev/null
+++ b/src/api/comments.ts
@@ -0,0 +1,14 @@
+import { Comment, CommentData } from '../types/Comment';
+import { client } from '../utils/fetchClient';
+
+export const getComments = (postId: number) => {
+  return client.get<Comment[]>(`/comments?postId=${postId}`);
+};
+
+export const deleteComment = (commentId: number) => {
+  return client.delete(`/comments/${commentId}`);
+};
+
+export const addComment = (newComment: CommentData) => {
+  return client.post<Comment>('/comments', newComment);
+};
diff --git a/src/api/posts.ts b/src/api/posts.ts
new file mode 100644
index 000000000..a6a1739ec
--- /dev/null
+++ b/src/api/posts.ts
@@ -0,0 +1,6 @@
+import { Post } from '../types/Post';
+import { client } from '../utils/fetchClient';
+
+export const getPosts = (userId: number) => {
+  return client.get<Post[]>(`/posts?userId=${userId}`);
+};
diff --git a/src/api/users.ts b/src/api/users.ts
new file mode 100644
index 000000000..386bfacd5
--- /dev/null
+++ b/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`);
+};
diff --git a/src/components/NewCommentForm.tsx b/src/components/NewCommentForm.tsx
index 73a8a0b45..592a3aa4b 100644
--- a/src/components/NewCommentForm.tsx
+++ b/src/components/NewCommentForm.tsx
@@ -1,8 +1,91 @@
-import React from 'react';
+import React, { Dispatch, SetStateAction, useState } from 'react';
+import { addComment } from '../api/comments';
+import classNames from 'classnames';
+import { Comment } from '../types/Comment';
+
+type Props = {
+  postId: number;
+  setComments: Dispatch<SetStateAction<Comment[]>>;
+  setIsNewCommentError: (newState: boolean) => void;
+};
+
+export const NewCommentForm: React.FC<Props> = ({
+  postId,
+  setComments,
+  setIsNewCommentError,
+}) => {
+  const [authorName, setAuthorName] = useState<string>('');
+  const [nameError, setNameError] = useState(false);
+
+  const [authorEmail, setAuthorEmail] = useState('');
+  const [emailError, setEmailError] = useState(false);
+
+  const [text, setText] = useState('');
+  const [textError, setTextError] = useState(false);
+
+  const [isLoading, setIsLoading] = useState(false);
+
+  const handleOnNameChange = (event: React.ChangeEvent<HTMLInputElement>) => {
+    setNameError(false);
+    setAuthorName(event.target.value);
+  };
+
+  const handleOnEmailChange = (event: React.ChangeEvent<HTMLInputElement>) => {
+    setEmailError(false);
+    setAuthorEmail(event.target.value);
+  };
+
+  const handleOnTextChange = (
+    event: React.ChangeEvent<HTMLTextAreaElement>,
+  ) => {
+    setTextError(false);
+    setText(event.target.value);
+  };
+
+  const handleOnSubmit = (event: React.FormEvent) => {
+    event.preventDefault();
+
+    if (!authorName || !authorEmail || !text) {
+      setNameError(!authorName);
+      setEmailError(!authorEmail);
+      setTextError(!text);
+
+      return;
+    }
+
+    setIsLoading(true);
+
+    const newComment = {
+      postId: postId,
+      name: authorName,
+      email: authorEmail,
+      body: text,
+    };
+
+    addComment(newComment)
+      .then(commentToAdd => {
+        setComments((prevComments: Comment[]) => [
+          ...prevComments,
+          commentToAdd as Comment,
+        ]);
+        setText('');
+      })
+      .catch(() => setIsNewCommentError(true))
+      .finally(() => setIsLoading(false));
+  };
+
+  const handleOnClear = () => {
+    setAuthorName('');
+    setAuthorEmail('');
+    setText('');
+
+    setNameError(false);
+    setEmailError(false);
+    setTextError(false);
+  };
 
-export const NewCommentForm: React.FC = () => {
   return (
-    <form data-cy="NewCommentForm">
+    <form data-cy="NewCommentForm" onSubmit={handleOnSubmit}>
       <div className="field" data-cy="NameField">
         <label className="label" htmlFor="comment-author-name">
           Author Name
@@ -12,26 +95,32 @@ export const NewCommentForm: React.FC = () => {
           <input
             type="text"
             name="name"
+            value={authorName}
             id="comment-author-name"
             placeholder="Name Surname"
-            className="input is-danger"
+            className={classNames('input', { 'is-danger': nameError })}
+            onChange={handleOnNameChange}
           />
 
           <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>
+          {nameError && (
+            <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>
+        {nameError && (
+          <p className="help is-danger" data-cy="ErrorMessage">
+            Name is required
+          </p>
+        )}
       </div>
 
       <div className="field" data-cy="EmailField">
@@ -41,28 +130,34 @@ export const NewCommentForm: React.FC = () => {
 
         <div className="control has-icons-left has-icons-right">
           <input
-            type="text"
+            type="email"
             name="email"
+            value={authorEmail}
             id="comment-author-email"
             placeholder="email@test.com"
-            className="input is-danger"
+            className={classNames('input', { 'is-danger': emailError })}
+            onChange={e => handleOnEmailChange(e)}
           />
 
           <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>
+          {emailError && (
+            <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>
+        {emailError && (
+          <p className="help is-danger" data-cy="ErrorMessage">
+            Email is required
+          </p>
+        )}
       </div>
 
       <div className="field" data-cy="BodyField">
@@ -74,26 +169,40 @@ export const NewCommentForm: React.FC = () => {
           <textarea
             id="comment-body"
             name="body"
+            value={text}
             placeholder="Type comment here"
-            className="textarea is-danger"
+            className={classNames('input', { 'is-danger': textError })}
+            onChange={handleOnTextChange}
           />
         </div>
 
-        <p className="help is-danger" data-cy="ErrorMessage">
-          Enter some text
-        </p>
+        {textError && (
+          <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">
+          <button
+            type="submit"
+            className={classNames('button is-link', {
+              'is-loading': isLoading,
+            })}
+            onClick={handleOnSubmit}
+          >
             Add
           </button>
         </div>
 
         <div className="control">
           {/* eslint-disable-next-line react/button-has-type */}
-          <button type="reset" className="button is-link is-light">
+          <button
+            type="reset"
+            className="button is-link is-light"
+            onClick={handleOnClear}
+          >
             Clear
           </button>
         </div>
diff --git a/src/components/PostDetails.tsx b/src/components/PostDetails.tsx
index 2f82db916..3427ad2d3 100644
--- a/src/components/PostDetails.tsx
+++ b/src/components/PostDetails.tsx
@@ -1,106 +1,126 @@
-import React from 'react';
+import React, { useEffect, useState } from 'react';
 import { Loader } from './Loader';
 import { NewCommentForm } from './NewCommentForm';
+import { Post } from '../types/Post';
+import { Comment } from '../types/Comment';
+import { deleteComment, getComments } from '../api/comments';
+
+type Props = {
+  selectedPost: Post;
+};
+
+export const PostDetails: React.FC<Props> = ({ selectedPost }) => {
+  const [isLoading, setIsLoading] = useState(false);
+  const [comments, setComments] = useState<Comment[]>([]);
+  const [error, setError] = useState(false);
+  const [isNewCommentError, setIsNewCommentError] = useState(false);
+  const [isOpenNewComment, setIsOpenNewComment] = useState(false);
+
+  const noErrors = !isNewCommentError && !error;
+
+  useEffect(() => {
+    setIsLoading(true);
+    setIsNewCommentError(false);
+    setIsOpenNewComment(false);
+
+    if (selectedPost) {
+      getComments(selectedPost.id)
+        .then(setComments)
+        .catch(() => {
+          setError(true);
+        })
+        .finally(() => {
+          setIsLoading(false);
+        });
+    }
+  }, [selectedPost]);
+
+  const handleDeleteComment = (commentId: number) => {
+    setComments(prevComments => prevComments.filter(c => c.id !== commentId));
+
+    deleteComment(commentId).catch(() => setComments(comments));
+  };
+
+  const handleNewComment = () => {
+    setIsOpenNewComment(true);
+  };
 
-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>
+          <h2 data-cy="PostTitle">{`#${selectedPost.id}: ${selectedPost.title}`}</h2>
+
+          <p data-cy="PostBody">{selectedPost.body}</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>
+          {isLoading && <Loader />}
 
-            <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>
+          {!noErrors && (
+            <div className="notification is-danger" data-cy="CommentsError">
+              Something went wrong!
             </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>
+          {!comments.length && noErrors && !isLoading && (
+            <p className="title is-4" data-cy="NoCommentsMessage">
+              No comments yet
+            </p>
+          )}
+
+          {!!comments.length && noErrors && !isLoading && (
+            <>
+              <p className="title is-4">Comments:</p>
+
+              {comments.map(comment => (
+                <article
+                  key={comment.id}
+                  className="message is-small"
+                  data-cy="Comment"
+                >
+                  <div className="message-header">
+                    <a href={`mailto:${comment.email}`} data-cy="CommentAuthor">
+                      {comment.name}
+                    </a>
+                    <button
+                      data-cy="CommentDelete"
+                      type="button"
+                      className="delete is-small"
+                      aria-label="delete"
+                      onClick={() => handleDeleteComment(comment.id)}
+                    >
+                      delete button
+                    </button>
+                  </div>
+
+                  <div className="message-body" data-cy="CommentBody">
+                    {comment.body}
+                  </div>
+                </article>
+              ))}
+            </>
+          )}
+
+          {!isOpenNewComment && noErrors && !isLoading && (
+            <button
+              data-cy="WriteCommentButton"
+              type="button"
+              className="button is-link"
+              onClick={handleNewComment}
+            >
+              Write a comment
+            </button>
+          )}
         </div>
 
-        <NewCommentForm />
+        {isOpenNewComment && (
+          <NewCommentForm
+            postId={selectedPost.id}
+            setComments={setComments}
+            setIsNewCommentError={setIsNewCommentError}
+          />
+        )}
       </div>
     </div>
   );
diff --git a/src/components/PostsList.tsx b/src/components/PostsList.tsx
index cf90f04b0..3c9a88dc5 100644
--- a/src/components/PostsList.tsx
+++ b/src/components/PostsList.tsx
@@ -1,86 +1,64 @@
-import React from 'react';
+import { Post } from '../types/Post';
+import classNames from 'classnames';
 
-export const PostsList: React.FC = () => (
-  <div data-cy="PostsList">
-    <p className="title">Posts:</p>
+type Props = {
+  posts: Post[];
+  selectedPost: Post | null;
+  setSelectedPost: (post: Post | null) => void;
+};
 
-    <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>
+export const PostsList: React.FC<Props> = ({
+  posts,
+  selectedPost,
+  setSelectedPost,
+}) => {
+  const isOpen = (postId: number) => {
+    return postId === selectedPost?.id;
+  };
 
-      <tbody>
-        <tr data-cy="Post">
-          <td data-cy="PostId">17</td>
+  const handleOnClick = (post: Post) => {
+    const definedValue = isOpen(post.id) ? null : post;
 
-          <td data-cy="PostTitle">
-            fugit voluptas sed molestias voluptatem provident
-          </td>
+    setSelectedPost(definedValue);
+  };
 
-          <td className="has-text-right is-vcentered">
-            <button
-              type="button"
-              data-cy="PostButton"
-              className="button is-link is-light"
-            >
-              Open
-            </button>
-          </td>
-        </tr>
+  return (
+    <div data-cy="PostsList">
+      <p className="title">Posts:</p>
 
-        <tr data-cy="Post">
-          <td data-cy="PostId">18</td>
+      <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>
 
-          <td data-cy="PostTitle">
-            voluptate et itaque vero tempora molestiae
-          </td>
+        <tbody>
+          {posts.map(post => (
+            <tr key={post.id} data-cy="Post">
+              <td data-cy="PostId">{post.id}</td>
 
-          <td className="has-text-right is-vcentered">
-            <button
-              type="button"
-              data-cy="PostButton"
-              className="button is-link"
-            >
-              Close
-            </button>
-          </td>
-        </tr>
+              <td data-cy="PostTitle">{post.title}</td>
 
-        <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>
-);
+              <td className="has-text-right is-vcentered">
+                <button
+                  type="button"
+                  data-cy="PostButton"
+                  className={classNames('button is-link', {
+                    'is-light': !isOpen(post.id),
+                  })}
+                  onClick={() => handleOnClick(post)}
+                >
+                  {isOpen(post.id) ? 'Close' : 'Open'}
+                </button>
+              </td>
+            </tr>
+          ))}
+        </tbody>
+      </table>
+    </div>
+  );
+};
diff --git a/src/components/UserSelector.tsx b/src/components/UserSelector.tsx
index c89442841..4eae472ae 100644
--- a/src/components/UserSelector.tsx
+++ b/src/components/UserSelector.tsx
@@ -1,16 +1,59 @@
-import React from 'react';
+import classNames from 'classnames';
+import React, { useContext, useEffect, useRef, useState } from 'react';
+import { User } from '../types/User';
+import { getUsers } from '../api/users';
+import { SetUserContext, UserContext } from '../context/UserContext';
 
 export const UserSelector: React.FC = () => {
+  const selectedUser = useContext(UserContext);
+  const setSelectedUser = useContext(SetUserContext);
+  const [users, setUsers] = useState<User[]>([]);
+  const [dropdown, setDropdown] = useState(false);
+
+  const dropdownRef = useRef<HTMLDivElement>(null);
+
+  const handleClickOutside = (event: MouseEvent) => {
+    if (
+      dropdownRef.current &&
+      !dropdownRef.current.contains(event.target as Node)
+    ) {
+      setDropdown(false);
+    }
+  };
+
+  const handleOnSelectUser = (user: User) => {
+    setSelectedUser(user);
+    setDropdown(false);
+  };
+
+  useEffect(() => {
+    getUsers().then(setUsers);
+    document.addEventListener('click', handleClickOutside);
+
+    return () => {
+      document.removeEventListener('click', handleClickOutside);
+    };
+  }, [setDropdown]);
+
+  const handleOnClick = () => {
+    setDropdown(!dropdown);
+  };
+
   return (
-    <div data-cy="UserSelector" className="dropdown is-active">
+    <div
+      ref={dropdownRef}
+      data-cy="UserSelector"
+      className={classNames('dropdown', { 'is-active': dropdown })}
+    >
       <div className="dropdown-trigger">
         <button
           type="button"
           className="button"
           aria-haspopup="true"
           aria-controls="dropdown-menu"
+          onClick={handleOnClick}
         >
-          <span>Choose a user</span>
+          <span>{selectedUser ? selectedUser.name : 'Choose a user'}</span>
 
           <span className="icon is-small">
             <i className="fas fa-angle-down" aria-hidden="true" />
@@ -20,21 +63,18 @@ export const UserSelector: React.FC = () => {
 
       <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>
+          {users.map(user => (
+            <a
+              href={`#user-${user.id}`}
+              key={user.id}
+              className={classNames('dropdown-item', {
+                'is-active': user.id === selectedUser?.id,
+              })}
+              onClick={() => handleOnSelectUser(user)}
+            >
+              {user.name}
+            </a>
+          ))}
         </div>
       </div>
     </div>
diff --git a/src/context/UserContext.tsx b/src/context/UserContext.tsx
new file mode 100644
index 000000000..b2fbbccdf
--- /dev/null
+++ b/src/context/UserContext.tsx
@@ -0,0 +1,25 @@
+import React, { createContext, useState } from 'react';
+import { User } from '../types/User';
+
+type SetUserContextType = React.Dispatch<React.SetStateAction<User | null>>;
+
+export const UserContext = createContext<User | null>(null);
+export const SetUserContext = createContext<SetUserContextType | undefined>(
+  undefined,
+);
+
+type Props = {
+  children: React.ReactNode;
+};
+
+export const UserContextProvider: React.FC<Props> = ({ children }) => {
+  const [selectedUser, setSelectedUser] = useState<User | null>(null);
+
+  return (
+    <UserContext.Provider value={selectedUser}>
+      <SetUserContext.Provider value={setSelectedUser}>
+        {children}
+      </SetUserContext.Provider>
+    </UserContext.Provider>
+  );
+};
diff --git a/src/types/Comment.ts b/src/types/Comment.ts
index 61c98619c..a45c2563d 100644
--- a/src/types/Comment.ts
+++ b/src/types/Comment.ts
@@ -6,4 +6,4 @@ export interface Comment {
   body: string;
 }
 
-export type CommentData = Pick<Comment, 'name' | 'email' | 'body'>;
+export type CommentData = Pick<Comment, 'postId' | 'name' | 'email' | 'body'>;