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client/src/components/App.js

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+// import logo from './../logo.svg';
+// import './../styles/App.css';
+
+import React, { Component } from 'react';
+import AppointmentList from './AppointmentList';
+import CreateLink from './CreateAppointment'
+import Header from './Header';
+import Login from './Login'
+import Search from './Search';
+import { Redirect, Route, Switch } from 'react-router-dom';
+
+const App = () => {
+  return (
+    <div className="center w85">
+      <Header />
+      <div className="ph3 pv1 background-gray">
+        <Switch>
+          <Route exact path="/" component={AppointmentList} />
+          <Route
+            exact
+            path="/create"
+            component={CreateLink}
+          />
+          <Route exact path="/login" component={Login} />
+          <Route exact path="/search" component={Search} />
+          <Route
+            exact
+            path="/new/:page"
+            component={AppointmentList}
+          />
+        </Switch>
+      </div>
+    </div>
+  );
+};
+
+// class App extends Component {
+//   render() {
+//     return <CreateLink />;
+//   }
+// }
+
+// function App() {
+//   return (
+//     <div className="App">
+//       <header className="App-header">
+//         <img src={logo} className="App-logo" alt="logo" />
+//         <p>
+//           Edit <code>src/App.js</code> and save to reload.
+//         </p>
+//         <a
+//           className="App-link"
+//           href="https://reactjs.org"
+//           target="_blank"
+//           rel="noopener noreferrer"
+//         >
+//           Learn React
+//         </a>
+//       </header>
+//     </div>
+//   );
+// }
+
+export default App;

client/src/components/App.test.js

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+import { render, screen } from '@testing-library/react';
+import App from './App';
+
+test('renders learn react link', () => {
+  render(<App />);
+  const linkElement = screen.getByText(/learn react/i);
+  expect(linkElement).toBeInTheDocument();
+});

client/src/components/Appointment.js

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+import React from 'react';
+import { useMutation, gql } from '@apollo/client';
+import { AUTH_TOKEN, APPOINTMENTS_PER_PAGE } from '../constants';
+import { timeDifferenceForDate } from '../utils'
+import { FEED_QUERY } from './AppointmentList'
+
+const FOLLOW_MUTATION = gql`
+  mutation FollowMutation($appointmentId: ID!) {
+    follow(followId: $followId) {
+      id
+      appointment {
+        id
+        follows {
+          id
+          user {
+            id
+          }
+        }
+      }
+      user {
+        id
+      }
+    }
+  }
+`;
+
+const take = APPOINTMENTS_PER_PAGE;
+const skip = 0;
+const orderBy = { createdAt: 'desc' };
+
+const Appointment = (props) => {
+    const { appointment } = props;
+    const authToken = localStorage.getItem(AUTH_TOKEN);
+    const take = APPOINTMENTS_PER_PAGE;
+    const skip = 0;
+    const orderBy = { createdAt: 'desc' };
+
+    const [follow] = useMutation(FOLLOW_MUTATION, {
+        variables: {
+            appointmentId: appointment.id
+        },
+        update(cache, { data: { follow } }) {
+            const { feed } = cache.readQuery({
+                query: FEED_QUERY
+            });
+
+            const updatedAppointments = feed.follows.map((feedFollow) => {
+                if (feedFollow.id === appointment.id) {
+                    return {
+                        ...feedFollow,
+                        follows: [...feedFollow.follows, follow]
+                    };
+                }
+                return feedFollow;
+            });
+
+            cache.writeQuery({
+                query: FEED_QUERY,
+                data: {
+                    feed: {
+                        appointments: updatedAppointments
+                    }
+                }
+            });
+        }
+    });
+
+    return (
+        <div className="flex mt2 items-start">
+            <div className="flex items-center">
+                <span className="gray">{props.index + 1}.</span>
+                {authToken && (
+                    <div
+                        className="ml1 gray f11"
+                        style={{ cursor: 'pointer' }}
+                        onClick={follow}
+                    >
+                        ▲
+                    </div>
+                )}
+            </div>
+            <div className="ml1">
+                <div>
+                    {appointment.title} ({appointment.description})
+        </div>
+                {authToken && (
+                    <div className="f6 lh-copy gray">
+                        {appointment.follows.length} follows | by{' '}
+                        {follow.createdBy ? follow.createdBy.name : 'Unknown'}{' '}
+                        {timeDifferenceForDate(appointment.createdAt)}
+                    </div>
+                )}
+            </div>
+        </div>
+    );
+};
+
+export default Appointment;

client/src/components/AppointmentList.js

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+import React from 'react';
+import Appointment from './Appointment';
+import { useHistory } from 'react-router';
+import { APPOINTMENTS_PER_PAGE } from '../constants';
+import { useQuery, gql } from '@apollo/client';
+import { Link } from 'react-router-dom';
+
+export const FEED_QUERY = gql`
+  query FeedQuery(
+    $take: Int
+    $skip: Int
+    $orderBy: AppointmentOrderByInput
+  ) {
+    feed(take: $take, skip: $skip, orderBy: $orderBy) {
+      id
+      appointments {
+        id
+        createdAt
+        title
+        start
+        end
+        description
+        createdBy {
+          id
+          name
+        }
+        follows {
+          id
+          user {
+            id
+          }
+        }
+      }
+      count
+    }
+  }
+`;
+
+const NEW_APPOINTMENTS_SUBSCRIPTION = gql`
+  subscription {
+    newAppointment {
+      id
+      url
+      description
+      createdAt
+      createdBy {
+        id
+        name
+      }
+      follows {
+        id
+        user {
+          id
+        }
+      }
+    }
+  }
+`;
+
+const getQueryVariables = (isNewPage, page) => {
+  const skip = isNewPage ? (page - 1) * APPOINTMENTS_PER_PAGE : 0;
+  const take = isNewPage ? APPOINTMENTS_PER_PAGE : 100;
+  const orderBy = { createdAt: 'desc' };
+  console.log(isNewPage, page, APPOINTMENTS_PER_PAGE, skip, take, orderBy);
+  return { take, skip, orderBy };
+};
+
+const AppointmentList = () => {
+  const history = useHistory();
+  const isNewPage = history.location.pathname.includes(
+    'new'
+  );
+  const pageIndexParams = history.location.pathname.split(
+    '/'
+  );
+
+  const page = parseInt(
+    pageIndexParams[pageIndexParams.length - 1]
+  );
+
+  console.log(pageIndexParams.length, page);
+
+  const pageIndex = page ? (page - 1) * APPOINTMENTS_PER_PAGE : 0;
+
+  const {
+    data,
+    loading,
+    error,
+    subscribeToMore
+  } = useQuery(FEED_QUERY, {
+    variables: getQueryVariables(isNewPage, page)
+  });
+
+  // const { data } = useQuery(FEED_QUERY);
+
+  const getAppointmentsToRender = (isNewPage, data) => {
+    if (isNewPage) {
+      return data.feed.appointments;
+    }
+    const rankedAppointments = data.feed.appointments.slice();
+    rankedAppointments.sort(
+      (l1, l2) => l2.follows.length - l1.follows.length
+    );
+    return rankedAppointments;
+  };
+
+  subscribeToMore({
+    document: NEW_APPOINTMENTS_SUBSCRIPTION,
+    updateQuery: (prev, { subscriptionData }) => {
+      if (!subscriptionData.data) return prev;
+      const newAppointment = subscriptionData.data.newAppointment;
+      const exists = prev.feed.appointments.find(
+        ({ id }) => id === newAppointment.id
+      );
+      if (exists) return prev;
+
+      return Object.assign({}, prev, {
+        feed: {
+          appointments: [newAppointment, ...prev.feed.appointments],
+          count: prev.feed.appointments.length + 1,
+          __typename: prev.feed.__typename
+        }
+      });
+    }
+  });
+
+  return (
+    <>
+      {loading && <p>Loading...</p>}
+      {error && <pre>{JSON.stringify(error, null, 2)}</pre>}
+      {data && (
+        <>
+          {getAppointmentsToRender(isNewPage, data).map(
+            (appointment, index) => (
+              <Link
+                key={appointment.id}
+                link={appointment}
+                index={index + pageIndex}
+              />
+            )
+          )}
+          {isNewPage && (
+            <div className="flex ml4 mv3 gray">
+              <div
+                className="pointer mr2"
+                onClick={() => {
+                  if (page > 1) {
+                    history.push(`/new/${page - 1}`);
+                  }
+                }}
+              >
+                Previous
+            </div>
+              <div
+                className="pointer"
+                onClick={() => {
+                  if (
+                    page <=
+                    data.feed.count / APPOINTMENTS_PER_PAGE
+                  ) {
+                    const nextPage = page + 1;
+                    history.push(`/new/${nextPage}`);
+                  }
+                }}
+              >
+                Next
+            </div>
+            </div>
+          )}
+        </>
+      )}
+    </>
+  );
+};
+
+export default AppointmentList;

client/src/components/CreateAppointment.js

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+import React, { useState } from 'react';
+import { useHistory } from 'react-router';
+import { useMutation, gql } from '@apollo/client';
+import { APPOINTMENTS_PER_PAGE } from '../constants';
+import { FEED_QUERY } from './AppointmentList';
+
+const CREATE_APPOINTMENT_MUTATION = gql`
+  mutation CreateAppointmentMutation(
+    $description: String!
+    $url: String!
+  ) {
+    createAppointment(description: $description, url: $url) {
+      id
+      createdAt
+      url
+      description
+    }
+  }
+`;
+
+const CreateAppointment = () => {
+    const history = useHistory();
+
+    const [formState, setFormState] = useState({
+        title: '',
+        description: '',
+        start: '',
+        end: ''
+    });
+
+    const [createAppointment] = useMutation(CREATE_APPOINTMENT_MUTATION, {
+        variables: {
+            title: formState.title,
+            description: formState.description,
+            start: formState.start,
+            end: formState.end
+        },
+        update: (cache, { data: { createAppointment } }) => {
+            const take = APPOINTMENTS_PER_PAGE;
+            const skip = 0;
+            const orderBy = { createdAt: 'desc' };
+
+            const data = cache.readQuery({
+                query: FEED_QUERY,
+                variables: {
+                    take,
+                    skip,
+                    orderBy
+                }
+            });
+
+            cache.writeQuery({
+                query: FEED_QUERY,
+                data: {
+                    feed: {
+                        appointments: [createAppointment, ...data.feed.appointments]
+                    }
+                },
+                variables: {
+                    take,
+                    skip,
+                    orderBy
+                }
+            });
+        },
+        onCompleted: () => history.push('/new/1')
+    });
+
+    return (
+        <div>
+            <form
+                onSubmit={(e) => {
+                    e.preventDefault();
+                    createAppointment();
+                }}
+            >
+                <div className="flex flex-column mt3">
+                    <input
+                        className="mb2"
+                        value={formState.title}
+                        onChange={(e) =>
+                            setFormState({
+                                ...formState,
+                                title: e.target.value
+                            })
+                        }
+                        type="text"
+                        placeholder="The title for the appointment"
+                    />
+                    <input
+                        className="mb2"
+                        value={formState.description}
+                        onChange={(e) =>
+                            setFormState({
+                                ...formState,
+                                description: e.target.value
+                            })
+                        }
+                        type="text"
+                        placeholder="A description for the appointment"
+                    />
+                    <input
+                        className="mb2"
+                        value={formState.start}
+                        onChange={(e) =>
+                            setFormState({
+                                ...formState,
+                                start: e.target.value
+                            })
+                        }
+                        type="text"
+                        placeholder="The start for the appointment"
+                    />
+                    <input
+                        className="mb2"
+                        value={formState.end}
+                        onChange={(e) =>
+                            setFormState({
+                                ...formState,
+                                end: e.target.value
+                            })
+                        }
+                        type="text"
+                        placeholder="The end for the appointment"
+                    />
+                </div>
+                <button type="submit">Submit</button>
+            </form>
+        </div>
+    );
+};
+
+export default CreateAppointment;

client/src/components/Header.js

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+import React from 'react';
+import { useHistory } from 'react-router';
+import { Link } from 'react-router-dom';
+import { AUTH_TOKEN } from '../constants';
+
+const Header = () => {
+    const history = useHistory();
+    const authToken = localStorage.getItem(AUTH_TOKEN);
+    return (
+        <div className="flex pa1 justify-between nowrap orange">
+            <div className="flex flex-fixed black">
+                <div className="fw7 mr1">Hacker News</div>
+                <Link to="/" className="ml1 no-underline black">
+                    new
+        </Link>
+                <div className="ml1">|</div>
+                <Link to="/top" className="ml1 no-underline black">
+                    top
+                </Link>
+                <div className="ml1">|</div>
+                <Link to="/search" className="ml1 no-underline black">
+                    search
+  </Link>
+                {authToken && (
+                    <div className="flex">
+                        <div className="ml1">|</div>
+                        <Link
+                            to="/create"
+                            className="ml1 no-underline black"
+                        >
+                            submit
+            </Link>
+                    </div>
+                )}
+            </div>
+            <div className="flex flex-fixed">
+                {authToken ? (
+                    <div
+                        className="ml1 pointer black"
+                        onClick={() => {
+                            localStorage.removeItem(AUTH_TOKEN);
+                            history.push(`/`);
+                        }}
+                    >
+                        logout
+                    </div>
+                ) : (
+                        <Link
+                            to="/login"
+                            className="ml1 no-underline black"
+                        >
+                            login
+                        </Link>
+                    )}
+            </div>
+        </div>
+    );
+};
+
+export default Header;

client/src/components/Login.js

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+import React, { useState } from 'react';
+import { useHistory } from 'react-router';
+import { useMutation, gql } from '@apollo/client';
+import { AUTH_TOKEN } from '../constants';
+
+const SIGNUP_MUTATION = gql`
+  mutation SignupMutation(
+    $email: String!
+    $password: String!
+    $name: String!
+  ) {
+    signup(
+      email: $email
+      password: $password
+      name: $name
+    ) {
+      token
+    }
+  }
+`;
+
+const LOGIN_MUTATION = gql`
+  mutation LoginMutation(
+    $email: String!
+    $password: String!
+  ) {
+    login(email: $email, password: $password) {
+      token
+    }
+  }
+`;
+
+const Login = () => {
+    const history = useHistory();
+
+    const [formState, setFormState] = useState({
+        login: true,
+        email: '',
+        password: '',
+        name: ''
+    });
+
+    const [login] = useMutation(LOGIN_MUTATION, {
+        variables: {
+            email: formState.email,
+            password: formState.password
+        },
+        onCompleted: ({ login }) => {
+            localStorage.setItem(AUTH_TOKEN, login.token);
+            history.push('/');
+        }
+    });
+
+    const [signup] = useMutation(SIGNUP_MUTATION, {
+        variables: {
+            name: formState.name,
+            email: formState.email,
+            password: formState.password
+        },
+        onCompleted: ({ signup }) => {
+            localStorage.setItem(AUTH_TOKEN, signup.token);
+            history.push('/');
+        }
+    });
+
+    return (
+        <div>
+            <h4 className="mv3">
+                {formState.login ? 'Login' : 'Sign Up'}
+            </h4>
+            <div className="flex flex-column">
+                {!formState.login && (
+                    <input
+                        value={formState.name}
+                        onChange={(e) =>
+                            setFormState({
+                                ...formState,
+                                name: e.target.value
+                            })
+                        }
+                        type="text"
+                        placeholder="Your name"
+                    />
+                )}
+                <input
+                    value={formState.email}
+                    onChange={(e) =>
+                        setFormState({
+                            ...formState,
+                            email: e.target.value
+                        })
+                    }
+                    type="text"
+                    placeholder="Your email address"
+                />
+                <input
+                    value={formState.password}
+                    onChange={(e) =>
+                        setFormState({
+                            ...formState,
+                            password: e.target.value
+                        })
+                    }
+                    type="password"
+                    placeholder="Choose a safe password"
+                />
+            </div>
+            <div className="flex mt3">
+                <button
+                    className="pointer mr2 button"
+                    onClick={formState.login ? login : signup}
+                >
+                    {formState.login ? 'login' : 'create account'}
+                </button>
+                <button
+                    className="pointer button"
+                    onClick={(e) =>
+                        setFormState({
+                            ...formState,
+                            login: !formState.login
+                        })
+                    }
+                >
+                    {formState.login
+                        ? 'need to create an account?'
+                        : 'already have an account?'}
+                </button>
+            </div>
+        </div>
+    );
+};
+
+export default Login;

client/src/components/Search.js

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+import React, { useState } from 'react';
+import { useMutation } from '@apollo/client';
+import { useLazyQuery } from '@apollo/client';
+import gql from 'graphql-tag';
+import Appointment from './Appointment';
+import { Link } from 'react-router-dom';
+
+const FEED_SEARCH_QUERY = gql`
+  query FeedSearchQuery($filter: String!) {
+    feed(filter: $filter) {
+      id
+      links {
+        id
+        url
+        description
+        createdAt
+        createdBy {
+          id
+          name
+        }
+        follows {
+          id
+          user {
+            id
+          }
+        }
+      }
+    }
+  }
+`;
+
+const Search = () => {
+  const [searchFilter, setSearchFilter] = useState('');
+  const [executeSearch, { data }] = useLazyQuery(
+    FEED_SEARCH_QUERY
+  );
+  return (
+    <>
+      <div>
+        Search
+        <input
+          type="text"
+          onChange={(e) => setSearchFilter(e.target.value)}
+        />
+        <button
+          onClick={() =>
+            executeSearch({
+              variables: { filter: searchFilter }
+            })
+          }
+        >
+          OK
+        </button>
+      </div>
+      {data &&
+        data.feed.appointments.map((appointment, index) => (
+          <Link key={appointment.id} link={appointment} index={index} />
+        ))}
+    </>
+  );
+};
+
+export default Search;

client/src/constants.js

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+export const AUTH_TOKEN = 'auth-token';
+export const APPOINTMENTS_PER_PAGE = 3;

client/src/index.js

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+import React from 'react';
+import { BrowserRouter } from 'react-router-dom';
+import { setContext } from '@apollo/client/link/context';
+import { AUTH_TOKEN } from './constants';
+
+import { split } from '@apollo/client';
+import { WebSocketLink } from '@apollo/client/link/ws';
+import { getMainDefinition } from '@apollo/client/utilities';
+// import AppointmentList from './components/AppointmentList';
+
+// class App extends Component {
+//   render() {
+//     return <AppointmentList />;
+//   }
+// }
+
+// export default App;
+
+// import React from 'react';
+import ReactDOM from 'react-dom';
+import './styles/index.css';
+import './styles/tachyons.min.css'
+import App from './components/App';
+// // import * as serviceWorker from './serviceWorker';
+
+// // 1
+import {
+  ApolloProvider,
+  ApolloClient,
+  createHttpLink,
+  InMemoryCache
+} from '@apollo/client';
+
+// 2
+const httpLink = createHttpLink({
+  uri: 'http://localhost:4000'
+});
+
+// attach the auth_token to all requests to GraphQL server
+const authLink = setContext((_, { headers }) => {
+  const token = localStorage.getItem(AUTH_TOKEN);
+  return {
+    headers: {
+      ...headers,
+      authorization: token ? `Bearer ${token}` : ''
+    }
+  };
+});
+
+const wsLink = new WebSocketLink({
+  uri: `ws://localhost:4000/graphql`,
+  options: {
+    reconnect: true,
+    connectionParams: {
+      authToken: localStorage.getItem(AUTH_TOKEN)
+    }
+  }
+});
+
+const link = split(
+  ({ query }) => {
+    const { kind, operation } = getMainDefinition(query);
+    return (
+      kind === 'OperationDefinition' &&
+      operation === 'subscription'
+    );
+  },
+  wsLink,
+  authLink.concat(httpLink)
+);
+
+// 3
+const client = new ApolloClient({
+  link,
+  cache: new InMemoryCache()
+});
+
+// 4
+ReactDOM.render(
+  <BrowserRouter>
+    <ApolloProvider client={client}>
+      <App />
+    </ApolloProvider>
+  </BrowserRouter>,
+  document.getElementById('root')
+);
+// serviceWorker.unregister();
+
+// If you want to start measuring performance in your app, pass a function
+// to log results (for example: reportWebVitals(console.log))
+// or send to an analytics endpoint. Learn more: https://bit.ly/CRA-vitals
+// reportWebVitals();

client/src/logo.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841.9 595.3"><g fill="#61DAFB"><path d="M666.3 296.5c0-32.5-40.7-63.3-103.1-82.4 14.4-63.6 8-114.2-20.2-130.4-6.5-3.8-14.1-5.6-22.4-5.6v22.3c4.6 0 8.3.9 11.4 2.6 13.6 7.8 19.5 37.5 14.9 75.7-1.1 9.4-2.9 19.3-5.1 29.4-19.6-4.8-41-8.5-63.5-10.9-13.5-18.5-27.5-35.3-41.6-50 32.6-30.3 63.2-46.9 84-46.9V78c-27.5 0-63.5 19.6-99.9 53.6-36.4-33.8-72.4-53.2-99.9-53.2v22.3c20.7 0 51.4 16.5 84 46.6-14 14.7-28 31.4-41.3 49.9-22.6 2.4-44 6.1-63.6 11-2.3-10-4-19.7-5.2-29-4.7-38.2 1.1-67.9 14.6-75.8 3-1.8 6.9-2.6 11.5-2.6V78.5c-8.4 0-16 1.8-22.6 5.6-28.1 16.2-34.4 66.7-19.9 130.1-62.2 19.2-102.7 49.9-102.7 82.3 0 32.5 40.7 63.3 103.1 82.4-14.4 63.6-8 114.2 20.2 130.4 6.5 3.8 14.1 5.6 22.5 5.6 27.5 0 63.5-19.6 99.9-53.6 36.4 33.8 72.4 53.2 99.9 53.2 8.4 0 16-1.8 22.6-5.6 28.1-16.2 34.4-66.7 19.9-130.1 62-19.1 102.5-49.9 102.5-82.3zm-130.2-66.7c-3.7 12.9-8.3 26.2-13.5 39.5-4.1-8-8.4-16-13.1-24-4.6-8-9.5-15.8-14.4-23.4 14.2 2.1 27.9 4.7 41 7.9zm-45.8 106.5c-7.8 13.5-15.8 26.3-24.1 38.2-14.9 1.3-30 2-45.2 2-15.1 0-30.2-.7-45-1.9-8.3-11.9-16.4-24.6-24.2-38-7.6-13.1-14.5-26.4-20.8-39.8 6.2-13.4 13.2-26.8 20.7-39.9 7.8-13.5 15.8-26.3 24.1-38.2 14.9-1.3 30-2 45.2-2 15.1 0 30.2.7 45 1.9 8.3 11.9 16.4 24.6 24.2 38 7.6 13.1 14.5 26.4 20.8 39.8-6.3 13.4-13.2 26.8-20.7 39.9zm32.3-13c5.4 13.4 10 26.8 13.8 39.8-13.1 3.2-26.9 5.9-41.2 8 4.9-7.7 9.8-15.6 14.4-23.7 4.6-8 8.9-16.1 13-24.1zM421.2 430c-9.3-9.6-18.6-20.3-27.8-32 9 .4 18.2.7 27.5.7 9.4 0 18.7-.2 27.8-.7-9 11.7-18.3 22.4-27.5 32zm-74.4-58.9c-14.2-2.1-27.9-4.7-41-7.9 3.7-12.9 8.3-26.2 13.5-39.5 4.1 8 8.4 16 13.1 24 4.7 8 9.5 15.8 14.4 23.4zM420.7 163c9.3 9.6 18.6 20.3 27.8 32-9-.4-18.2-.7-27.5-.7-9.4 0-18.7.2-27.8.7 9-11.7 18.3-22.4 27.5-32zm-74 58.9c-4.9 7.7-9.8 15.6-14.4 23.7-4.6 8-8.9 16-13 24-5.4-13.4-10-26.8-13.8-39.8 13.1-3.1 26.9-5.8 41.2-7.9zm-90.5 125.2c-35.4-15.1-58.3-34.9-58.3-50.6 0-15.7 22.9-35.6 58.3-50.6 8.6-3.7 18-7 27.7-10.1 5.7 19.6 13.2 40 22.5 60.9-9.2 20.8-16.6 41.1-22.2 60.6-9.9-3.1-19.3-6.5-28-10.2zM310 490c-13.6-7.8-19.5-37.5-14.9-75.7 1.1-9.4 2.9-19.3 5.1-29.4 19.6 4.8 41 8.5 63.5 10.9 13.5 18.5 27.5 35.3 41.6 50-32.6 30.3-63.2 46.9-84 46.9-4.5-.1-8.3-1-11.3-2.7zm237.2-76.2c4.7 38.2-1.1 67.9-14.6 75.8-3 1.8-6.9 2.6-11.5 2.6-20.7 0-51.4-16.5-84-46.6 14-14.7 28-31.4 41.3-49.9 22.6-2.4 44-6.1 63.6-11 2.3 10.1 4.1 19.8 5.2 29.1zm38.5-66.7c-8.6 3.7-18 7-27.7 10.1-5.7-19.6-13.2-40-22.5-60.9 9.2-20.8 16.6-41.1 22.2-60.6 9.9 3.1 19.3 6.5 28.1 10.2 35.4 15.1 58.3 34.9 58.3 50.6-.1 15.7-23 35.6-58.4 50.6zM320.8 78.4z"/><circle cx="420.9" cy="296.5" r="45.7"/><path d="M520.5 78.1z"/></g></svg>

client/src/reportWebVitals.js

@@ -0,0 +1,13 @@
+const reportWebVitals = onPerfEntry => {
+  if (onPerfEntry && onPerfEntry instanceof Function) {
+    import('web-vitals').then(({ getCLS, getFID, getFCP, getLCP, getTTFB }) => {
+      getCLS(onPerfEntry);
+      getFID(onPerfEntry);
+      getFCP(onPerfEntry);
+      getLCP(onPerfEntry);
+      getTTFB(onPerfEntry);
+    });
+  }
+};
+
+export default reportWebVitals;

client/src/setupTests.js

@@ -0,0 +1,5 @@
+// jest-dom adds custom jest matchers for asserting on DOM nodes.
+// allows you to do things like:
+// expect(element).toHaveTextContent(/react/i)
+// learn more: https://github.com/testing-library/jest-dom
+import '@testing-library/jest-dom';

client/src/styles/App.css

@@ -0,0 +1,38 @@
+.App {
+  text-align: center;
+}
+
+.App-logo {
+  height: 40vmin;
+  pointer-events: none;
+}
+
+@media (prefers-reduced-motion: no-preference) {
+  .App-logo {
+    animation: App-logo-spin infinite 20s linear;
+  }
+}
+
+.App-header {
+  background-color: #282c34;
+  min-height: 100vh;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  font-size: calc(10px + 2vmin);
+  color: white;
+}
+
+.App-link {
+  color: #61dafb;
+}
+
+@keyframes App-logo-spin {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}

client/src/styles/index.css

@@ -0,0 +1,57 @@
+body {
+  margin: 0;
+  padding: 0;
+  font-family: Verdana, Geneva, sans-serif;
+}
+
+input {
+  max-width: 500px;
+}
+
+.gray {
+  color: #828282;
+}
+
+.orange {
+  background-color: #ff6600;
+}
+
+.background-gray {
+  background-color: rgb(246, 246, 239);
+}
+
+.f11 {
+  font-size: 11px;
+}
+
+.w85 {
+  width: 85%;
+}
+
+.button {
+  font-family: monospace;
+  font-size: 10pt;
+  color: black;
+  background-color: buttonface;
+  text-align: center;
+  padding: 2px 6px 3px;
+  border-width: 2px;
+  border-style: outset;
+  border-color: buttonface;
+  cursor: pointer;
+  max-width: 250px;
+}
+
+/* body {
+  margin: 0;
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
+    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
+    sans-serif;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+code {
+  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
+    monospace;
+} */

client/src/utils.js

@@ -0,0 +1,45 @@
+function timeDifference(current, previous) {
+    const milliSecondsPerMinute = 60 * 1000;
+    const milliSecondsPerHour = milliSecondsPerMinute * 60;
+    const milliSecondsPerDay = milliSecondsPerHour * 24;
+    const milliSecondsPerMonth = milliSecondsPerDay * 30;
+    const milliSecondsPerYear = milliSecondsPerDay * 365;
+
+    const elapsed = current - previous;
+
+    if (elapsed < milliSecondsPerMinute / 3) {
+        return 'just now';
+    }
+
+    if (elapsed < milliSecondsPerMinute) {
+        return 'less than 1 min ago';
+    } else if (elapsed < milliSecondsPerHour) {
+        return (
+            Math.round(elapsed / milliSecondsPerMinute) +
+            ' min ago'
+        );
+    } else if (elapsed < milliSecondsPerDay) {
+        return (
+            Math.round(elapsed / milliSecondsPerHour) + ' h ago'
+        );
+    } else if (elapsed < milliSecondsPerMonth) {
+        return (
+            Math.round(elapsed / milliSecondsPerDay) + ' days ago'
+        );
+    } else if (elapsed < milliSecondsPerYear) {
+        return (
+            Math.round(elapsed / milliSecondsPerMonth) + ' mo ago'
+        );
+    } else {
+        return (
+            Math.round(elapsed / milliSecondsPerYear) +
+            ' years ago'
+        );
+    }
+}
+
+export function timeDifferenceForDate(date) {
+    const now = new Date().getTime();
+    const updated = new Date(date).getTime();
+    return timeDifference(now, updated);
+}