diff --git a/src/App.tsx b/src/App.tsx
index db56b44b0..85253bcf6 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,15 +1,25 @@
-import React from 'react';
+import React, { useContext } 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 {
+  ErrorContext,
+  PostDataContext,
+  PostsContext,
+  UserContext,
+} from './components/UserContext/UserContext';
 import { Loader } from './components/Loader';
+import { PostsList } from './components/PostsList';
+import { PostDetails } from './components/PostDetails';
 
 export const App: React.FC = () => {
+  const { isError, isLoadingPosts } = useContext(ErrorContext);
+  const { user } = useContext(UserContext);
+  const posts = useContext(PostsContext);
+  const postDetails = useContext(PostDataContext);
+
   return (
     <main className="section">
       <div className="container">
@@ -21,42 +31,56 @@ export const App: React.FC = () => {
               </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>
+                {!user && (
+                  <p data-cy="NoSelectedUser">
+                    No user selected
+                  </p>
+                )}
+                {isError && (
+                  <div
+                    className="notification is-danger"
+                    data-cy="PostsLoadingError"
+                  >
+                    Something went wrong!
+                  </div>
+                )}
 
-                <div className="notification is-warning" data-cy="NoPostsYet">
-                  No posts yet
-                </div>
+                {isLoadingPosts ? <Loader /> : (
+                  <>
+                    {(posts?.length > 0 && user && !isError) && (
+                      <PostsList />
+                    )}
 
-                <PostsList />
+                    {(posts?.length === 0 && user && !isError) && (
+                      <div
+                        className="notification is-warning"
+                        data-cy="NoPostsYet"
+                      >
+                        No posts yet
+                      </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 />
+          {postDetails.postData !== null && (
+            <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>
       </div>
     </main>
diff --git a/src/api/comments.ts b/src/api/comments.ts
new file mode 100644
index 000000000..c0109a160
--- /dev/null
+++ b/src/api/comments.ts
@@ -0,0 +1,15 @@
+import { Comment } from '../types/Comment';
+import { Post } from '../types/Post';
+import { client } from '../utils/fetchClient';
+
+export const getComments = (postData: Post | null) => {
+  return client.get<Comment[]>(`/comments?postId=${postData?.id}`);
+};
+
+export const createComment = (comment: Partial<Comment>) => {
+  return client.post<Comment>('/comments', comment);
+};
+
+export const deleteComment = (commentId: number) => {
+  return client.delete(`/comments/${commentId}`);
+};
diff --git a/src/api/posts.ts b/src/api/posts.ts
new file mode 100644
index 000000000..edd22a1dc
--- /dev/null
+++ b/src/api/posts.ts
@@ -0,0 +1,7 @@
+import { Post } from '../types/Post';
+import { User } from '../types/User';
+import { client } from '../utils/fetchClient';
+
+export const getPosts = (user: User | null) => {
+  return client.get<Post[]>(`/posts?userId=${user?.id}`);
+};
diff --git a/src/api/users.ts b/src/api/users.ts
new file mode 100644
index 000000000..816c8274b
--- /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..af97a8d38 100644
--- a/src/components/NewCommentForm.tsx
+++ b/src/components/NewCommentForm.tsx
@@ -1,103 +1,281 @@
-import React from 'react';
+import React, { useContext, useState } from 'react';
+import classNames from 'classnames';
+import { CommentData } from '../types/Comment';
+import {
+  CommentsContext,
+  ErrorContext,
+} from './UserContext/UserContext';
+import { createComment } from '../api/comments';
+
+type PostId = {
+  id: number;
+  userId: number;
+  title: string;
+  body: string;
+};
+
+type NewCommentFormProps = {
+  postId: PostId,
+};
+
+export const NewCommentForm: React.FC<NewCommentFormProps> = ({ postId }) => {
+  const [submitting, setSubmitting] = useState(false);
+  const { newCommentSelect } = useContext(CommentsContext);
+
+  const { isError } = useContext(ErrorContext);
+
+  const onAddComment = async ({ name, email, body }: CommentData) => {
+    const newComment = {
+      name,
+      email,
+      body,
+      postId: postId.id,
+    };
+
+    try {
+      setSubmitting(true);
+      await createComment(newComment);
+    } catch (error) {
+      setSubmitting(false);
+    } finally {
+      setSubmitting(false);
+    }
+  };
+
+  const [hasNameError, setHasNameError] = useState(false);
+  const [hasEmailError, setHasEmailError] = useState(false);
+  const [emailValidationError, setEmailValidationError] = useState(false);
+  const [hasBodyError, setHasBodyError] = useState(false);
+
+  const [{ name, email, body }, setValues] = useState({
+    name: '',
+    email: '',
+    body: '',
+  });
+  const handleChangeName = (
+    event: React.ChangeEvent<HTMLInputElement | HTMLTextAreaElement>,
+  ) => {
+    setValues(current => ({ ...current, name: event.target.value }));
+  };
+
+  const handleChangeEmail = (
+    event: React.ChangeEvent<HTMLInputElement | HTMLTextAreaElement>,
+  ) => {
+    setValues(current => ({ ...current, email: event.target.value }));
+  };
+
+  const handleChangeBody = (
+    event: React.ChangeEvent<HTMLInputElement | HTMLTextAreaElement>,
+  ) => {
+    setValues(current => ({ ...current, body: event.target.value }));
+  };
+
+  const validateEmail = (em: string) => {
+    const emailRegex = /^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$/i;
+
+    return emailRegex.test(em);
+  };
+
+  const handleSubmit = async (event: React.FormEvent) => {
+    event.preventDefault();
+
+    if (!validateEmail(email)) {
+      setEmailValidationError(true);
+    }
+
+    if (!email.trim().length) {
+      setHasEmailError(true);
+    }
+
+    if (!name.trim().length) {
+      setHasNameError(true);
+    }
+
+    if (!body.length) {
+      setHasBodyError(true);
+    }
+
+    if (!validateEmail(email) || !email.trim().length
+      || !name.trim().length || !body.length) {
+      return;
+    }
+
+    await onAddComment({ name, email, body });
+
+    const newComment = {
+      name,
+      email,
+      body,
+      postId: postId.id,
+      id: Date.now(),
+    };
+
+    newCommentSelect(newComment);
+
+    setValues(current => ({ ...current, body: '' }));
+  };
+
+  const clearForm = () => {
+    setValues({
+      name: '',
+      email: '',
+      body: '',
+    });
+
+    setHasNameError(false);
+    setHasEmailError(false);
+    setEmailValidationError(false);
+    setHasBodyError(false);
+  };
+
+  const focusErrorDisabled = () => {
+    setEmailValidationError(false);
+    setHasEmailError(false);
+  };
 
-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>
+    <>
+      <form
+        data-cy="NewCommentForm"
+        onSubmit={handleSubmit}
+        onReset={clearForm}
+      >
+        <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={classNames('input', { 'is-danger': hasNameError })}
+              value={name}
+              onChange={handleChangeName}
+              onFocus={() => setHasNameError(false)}
+            />
+
+            <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>
+          )}
 
-        <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 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={classNames('input',
+                { 'is-danger': hasEmailError })}
+              value={email}
+              onChange={handleChangeEmail}
+              onFocus={() => focusErrorDisabled()}
+            />
+
+            <span className="icon is-small is-left">
+              <i className="fas fa-envelope" />
+            </span>
+
+            {(hasEmailError || emailValidationError) && (
+              <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>
+          )}
+          {emailValidationError && (
+            <p className="help is-danger" data-cy="ErrorMessage">
+              Invalid email address
+            </p>
+          )}
+
         </div>
 
-        <p className="help is-danger" data-cy="ErrorMessage">
-          Enter some text
-        </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={classNames('textarea',
+                { 'is-danger': hasBodyError })}
+              value={body}
+              onChange={handleChangeBody}
+              onFocus={() => setHasBodyError(false)}
+            />
+          </div>
+
+          {hasBodyError && (
+            <p className="help is-danger" data-cy="ErrorMessage">
+              Enter some text
+            </p>
+          )}
 
-      <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 className="field is-grouped">
+          <div className="control">
+            <button
+              type="submit"
+              className={classNames('button', 'is-link', {
+                'is-loading': submitting,
+              })}
+            >
+              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>
+      {isError && (
+        <div className="notification is-danger is-light has-text-weight-normal">
+          Unable to add a comment
         </div>
-      </div>
-    </form>
+      )}
+    </>
   );
 };
diff --git a/src/components/PostDetails.tsx b/src/components/PostDetails.tsx
index ace945f0a..3888bdbab 100644
--- a/src/components/PostDetails.tsx
+++ b/src/components/PostDetails.tsx
@@ -1,117 +1,96 @@
-import React from 'react';
+import React, { useContext, useState } from 'react';
 import { Loader } from './Loader';
 import { NewCommentForm } from './NewCommentForm';
+import {
+  CommentsContext,
+  ErrorContext,
+  PostDataContext,
+} from './UserContext/UserContext';
 
 export const PostDetails: React.FC = () => {
+  const postDetails = useContext(PostDataContext);
+  const { isLoading } = useContext(ErrorContext);
+  const { isError } = useContext(ErrorContext);
+  const { comments, handleRemoveComment } = useContext(CommentsContext);
+  const [click, setClick] = useState(false);
+
   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
+            {`#${postDetails.postData?.id}: ${postDetails.postData?.title}`}
           </h2>
 
           <p data-cy="PostBody">
-            eveniet quo quis
-            laborum totam consequatur non dolor
-            ut et est repudiandae
-            est voluptatem vel debitis et magnam
+            {postDetails.postData?.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>
+          {isLoading && <Loader />}
 
-          <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
+          {isError && (
+            <div className="notification is-danger" data-cy="CommentsError">
+              Something went wrong
             </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>
+          {!comments.length && !isLoading && (
+            <p className="title is-4" data-cy="NoCommentsMessage">
+              No comments yet
+            </p>
+          )}
 
-              <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>
+          {!isLoading && (
+            <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"
+          {!isLoading && (
+            comments.map(comment => (
+              <article
+                className="message is-small"
+                data-cy="Comment"
+                key={comment.id}
               >
-                Misha Hrynko
-              </a>
+                <div className="message-header">
+                  <a href={comment.email} data-cy="CommentAuthor">
+                    {comment.name}
+                  </a>
+                  <button
+                    data-cy="CommentDelete"
+                    type="button"
+                    className="delete is-small"
+                    aria-label="delete"
+                    onClick={() => handleRemoveComment(comment.id)}
+                  >
+                    delete button
+                  </button>
+                </div>
 
-              <button
-                data-cy="CommentDelete"
-                type="button"
-                className="delete is-small"
-                aria-label="delete"
-              >
-                delete button
-              </button>
-            </div>
+                <div className="message-body" data-cy="CommentBody">
+                  {comment.body}
+                </div>
+              </article>
+            ))
+          )}
 
-            <div className="message-body" data-cy="CommentBody">
-              {'Multi\nline\ncomment'}
-            </div>
-          </article>
+          {!isLoading && (
+            <button
+              data-cy="WriteCommentButton"
+              type="button"
+              className="button is-link"
+              onClick={() => setClick(true)}
+            >
+              Write a comment
+            </button>
+          )}
 
-          <button
-            data-cy="WriteCommentButton"
-            type="button"
-            className="button is-link"
-          >
-            Write a comment
-          </button>
         </div>
 
-        <NewCommentForm />
+        {click && postDetails.postData !== null && !isLoading && (
+          <NewCommentForm postId={postDetails.postData} />)}
+
       </div>
     </div>
   );
diff --git a/src/components/PostsList.tsx b/src/components/PostsList.tsx
index 6e6efc0f3..1a604fbdd 100644
--- a/src/components/PostsList.tsx
+++ b/src/components/PostsList.tsx
@@ -1,85 +1,50 @@
-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>
-          <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>
-);
+import React, { useContext } from 'react';
+import classNames from 'classnames';
+import { PostDataContext, PostsContext } from './UserContext/UserContext';
+
+export const PostsList: React.FC = () => {
+  const posts = useContext(PostsContext);
+  const { postData, handlePost } = useContext(PostDataContext);
+
+  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 => (
+            <tr data-cy="Post" key={post.id}>
+              <td data-cy="PostId">{post.id}</td>
+
+              <td data-cy="PostTitle">
+                {post.title}
+              </td>
+
+              <td className="has-text-right is-vcentered">
+                <button
+                  type="button"
+                  data-cy="PostButton"
+                  className={classNames(
+                    'button',
+                    'is-link',
+                    { 'is-light': postData?.id !== post.id },
+                  )}
+                  onClick={() => handlePost(post)}
+                >
+                  {postData?.id === post.id ? 'Close' : 'Open'}
+                </button>
+              </td>
+            </tr>
+          ))}
+        </tbody>
+      </table>
+    </div>
+  );
+};
diff --git a/src/components/UserContext/UserContext.tsx b/src/components/UserContext/UserContext.tsx
new file mode 100644
index 000000000..933402cc7
--- /dev/null
+++ b/src/components/UserContext/UserContext.tsx
@@ -0,0 +1,167 @@
+import React, { useCallback, useEffect, useState } from 'react';
+import { User } from '../../types/User';
+import { getUsers } from '../../api/users';
+import { getPosts } from '../../api/posts';
+import { Post } from '../../types/Post';
+import { Comment } from '../../types/Comment';
+import { deleteComment, getComments } from '../../api/comments';
+
+type ErrorContextType = {
+  isLoading: boolean,
+  isError: boolean,
+  isLoadingPosts: boolean,
+};
+
+type UserType = {
+  user: User | null,
+  handleUserSelect: (id: User) => void,
+};
+
+type ComentsDataType = {
+  comments: Comment[],
+  newCommentSelect: (newComment: Comment) => void,
+  handleRemoveComment: (id: number) => void,
+};
+
+type PostDataType = {
+  postData: Post | null,
+  handlePost: (postDetails: Post) => void
+};
+
+type Props = {
+  children: React.ReactNode;
+};
+
+export const UsersContext = React.createContext<User[] | null>(null);
+export const ErrorContext
+  = React.createContext<ErrorContextType>({} as ErrorContextType);
+export const UserContext = React.createContext<UserType>({} as UserType);
+export const PostsContext
+  = React.createContext<Post[]>([]);
+export const CommentsContext
+  = React.createContext<ComentsDataType>({} as ComentsDataType);
+export const PostDataContext
+  = React.createContext<PostDataType>({} as PostDataType);
+
+export const UserProvider: React.FC<Props> = ({ children }) => {
+  const [users, setUsers] = useState<User[] | null>(null);
+  const [isLoading, setIsloading] = useState(false);
+  const [isLoadingPosts, setIsLoaidingPosts] = useState(false);
+  const [isError, setIsError] = useState(false);
+  const [user, setUser] = useState<User | null>(null);
+  const [posts, setPosts] = useState<Post[]>([]);
+  const [comments, setComments] = useState<Comment[]>([]);
+  const [postData, setPostData] = useState<Post | null>(null);
+
+  const handleUserSelect = (id: User) => {
+    setUser(id);
+
+    setPostData(null);
+  };
+
+  const newCommentSelect = (newComment: Comment) => {
+    setComments(prevComments => [...prevComments, newComment]);
+  };
+
+  const handlePost = (postDetails: Post) => {
+    if (postData?.id === postDetails.id) {
+      setPostData(null);
+    } else {
+      setPostData(postDetails);
+    }
+  };
+
+  const loadUsersFromServer = async () => {
+    try {
+      const getUsersFromServer = await getUsers();
+
+      setUsers(getUsersFromServer);
+    } catch (error) {
+      setIsError(true);
+    }
+  };
+
+  const loadPostsFromServer = async () => {
+    try {
+      setIsLoaidingPosts(true);
+      const getPostsFromServer = await getPosts(user);
+
+      setPosts(getPostsFromServer);
+    } catch (error) {
+      setIsError(true);
+      setIsLoaidingPosts(false);
+    } finally {
+      setIsLoaidingPosts(false);
+      setIsError(false);
+    }
+  };
+
+  const loadCommentsFromServer = async () => {
+    try {
+      setIsloading(true);
+      const getCommentsFromServer = await getComments(postData);
+
+      setComments(getCommentsFromServer);
+    } catch (error) {
+      setIsError(true);
+      setIsloading(false);
+    } finally {
+      setIsloading(false);
+      setIsError(false);
+    }
+  };
+
+  const handleRemoveComment = async (id: number) => {
+    try {
+      await deleteComment(id);
+      const visibleComments = comments.filter(comment => {
+        return comment.id !== id;
+      });
+
+      setComments(visibleComments);
+    } catch {
+      setIsError(true);
+    }
+  };
+
+  const loadComments = useCallback(() => {
+    loadCommentsFromServer();
+  }, [postData]);
+
+  useEffect(() => {
+    loadUsersFromServer();
+  }, []);
+
+  useEffect(() => {
+    if (user) {
+      loadPostsFromServer();
+    }
+  }, [user]);
+
+  useEffect(() => {
+    if (postData) {
+      loadComments();
+    }
+  }, [postData]);
+
+  return (
+    <UsersContext.Provider value={users}>
+      <ErrorContext.Provider value={{ isLoading, isError, isLoadingPosts }}>
+        <UserContext.Provider value={{ user, handleUserSelect }}>
+          <PostsContext.Provider value={posts}>
+            <PostDataContext.Provider value={{ postData, handlePost }}>
+              <CommentsContext.Provider value={{
+                comments,
+                newCommentSelect,
+                handleRemoveComment,
+              }}
+              >
+                {children}
+              </CommentsContext.Provider>
+            </PostDataContext.Provider>
+          </PostsContext.Provider>
+        </UserContext.Provider>
+      </ErrorContext.Provider>
+    </UsersContext.Provider>
+  );
+};
diff --git a/src/components/UserSelector.tsx b/src/components/UserSelector.tsx
index cb83a8f68..02031768f 100644
--- a/src/components/UserSelector.tsx
+++ b/src/components/UserSelector.tsx
@@ -1,6 +1,22 @@
-import React from 'react';
+import React, { useContext, useState } from 'react';
+import { UsersContext, UserContext } from './UserContext/UserContext';
+import { User } from '../types/User';
 
 export const UserSelector: React.FC = () => {
+  const users = useContext(UsersContext);
+  const [isOpen, setIsOpen] = useState(false);
+
+  const { handleUserSelect, user } = useContext(UserContext);
+
+  const handleMenu = () => {
+    setIsOpen(prev => !prev);
+  };
+
+  const handleUserId = (userId: User) => {
+    handleUserSelect(userId);
+    handleMenu();
+  };
+
   return (
     <div
       data-cy="UserSelector"
@@ -12,8 +28,13 @@ export const UserSelector: React.FC = () => {
           className="button"
           aria-haspopup="true"
           aria-controls="dropdown-menu"
+          onClick={handleMenu}
         >
-          <span>Choose a user</span>
+          {user ? (
+            <span>{user.name}</span>
+          ) : (
+            <span>Choose a user</span>
+          )}
 
           <span className="icon is-small">
             <i className="fas fa-angle-down" aria-hidden="true" />
@@ -21,15 +42,22 @@ export const UserSelector: React.FC = () => {
         </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>
+      {isOpen && (
+        <div className="dropdown-menu" id="dropdown-menu" role="menu">
+          <div className="dropdown-content">
+            {(users?.map(item => (
+              <a
+                href={`#user-${item.id}`}
+                className="dropdown-item"
+                key={item.id}
+                onClick={() => handleUserId(item)}
+              >
+                {item.name}
+              </a>
+            )))}
+          </div>
         </div>
-      </div>
+      )}
     </div>
   );
 };
diff --git a/src/index.tsx b/src/index.tsx
index 6710ea0c2..2816a32b0 100644
--- a/src/index.tsx
+++ b/src/index.tsx
@@ -1,8 +1,10 @@
 import ReactDOM from 'react-dom';
-
 import { App } from './App';
+import { UserProvider } from './components/UserContext/UserContext';
 
 ReactDOM.render(
-  <App />,
+  <UserProvider>
+    <App />
+  </UserProvider>,
   document.getElementById('root'),
 );