ui: Migrate from CRA to Next.js

This change updates the web frontend to use Next.js instead of Create
React App (CRA). Next.js enables the possibility of rendering pages on
the server side (which reduces the time to first frame) and overall
provides a better development experience.

Future commits will try to futher optimize the implementation for
Next.js.

9 files changed, 142 insertions, 136 deletions

diff --git a/opendc-web/opendc-web-ui/src/components/app/map/MapStageComponent.js b/opendc-web/opendc-web-ui/src/components/app/map/MapStageComponent.js
index 7ca10792..dd32927f 100644
--- a/opendc-web/opendc-web-ui/src/components/app/map/MapStageComponent.js
+++ b/opendc-web/opendc-web-ui/src/components/app/map/MapStageComponent.js
@@ -1,4 +1,4 @@
-import React from 'react'
+import React, { useEffect, useMemo, useRef, useState } from 'react'
 import { HotKeys } from 'react-hotkeys'
 import { Stage } from 'react-konva'
 import MapLayer from '../../../containers/app/map/layers/MapLayer'
@@ -6,85 +6,75 @@ import ObjectHoverLayer from '../../../containers/app/map/layers/ObjectHoverLaye
 import RoomHoverLayer from '../../../containers/app/map/layers/RoomHoverLayer'
 import { NAVBAR_HEIGHT } from '../../navigation/Navbar'
 import { MAP_MOVE_PIXELS_PER_EVENT } from './MapConstants'
-import { Provider } from 'react-redux'
-import { store } from '../../../store/configure-store'
+import { Provider, useStore } from 'react-redux'
 
-class MapStageComponent extends React.Component {
-    state = {
-        mouseX: 0,
-        mouseY: 0,
+function MapStageComponent({
+    mapDimensions,
+    mapPosition,
+    setMapDimensions,
+    setMapPositionWithBoundsCheck,
+    zoomInOnPosition,
+}) {
+    const [pos, setPos] = useState([0, 0])
+    const stage = useRef(null)
+    const [x, y] = pos
+    const handlers = {
+        MOVE_LEFT: () => moveWithDelta(MAP_MOVE_PIXELS_PER_EVENT, 0),
+        MOVE_RIGHT: () => moveWithDelta(-MAP_MOVE_PIXELS_PER_EVENT, 0),
+        MOVE_UP: () => moveWithDelta(0, MAP_MOVE_PIXELS_PER_EVENT),
+        MOVE_DOWN: () => moveWithDelta(0, -MAP_MOVE_PIXELS_PER_EVENT),
     }
 
-    constructor(props) {
-        super(props)
+    const moveWithDelta = (deltaX, deltaY) =>
+        setMapPositionWithBoundsCheck(mapPosition.x + deltaX, mapPosition.y + deltaY)
+    const updateMousePosition = () => {
+        if (!stage.current) {
+            return
+        }
 
-        this.updateDimensions = this.updateDimensions.bind(this)
-        this.updateScale = this.updateScale.bind(this)
+        const mousePos = stage.current.getStage().getPointerPosition()
+        setPos([mousePos.x, mousePos.y])
     }
+    const updateDimensions = () => setMapDimensions(window.innerWidth, window.innerHeight - NAVBAR_HEIGHT)
+    const updateScale = (e) => zoomInOnPosition(e.deltaY < 0, x, y)
 
-    componentDidMount() {
-        this.updateDimensions()
+    useEffect(() => {
+        updateDimensions()
 
-        window.addEventListener('resize', this.updateDimensions)
-        window.addEventListener('wheel', this.updateScale)
+        window.addEventListener('resize', updateDimensions)
+        window.addEventListener('wheel', updateScale)
 
         window['exportCanvasToImage'] = () => {
             const download = document.createElement('a')
-            download.href = this.stage.getStage().toDataURL()
+            download.href = stage.current.getStage().toDataURL()
             download.download = 'opendc-canvas-export-' + Date.now() + '.png'
             download.click()
         }
-    }
-
-    componentWillUnmount() {
-        window.removeEventListener('resize', this.updateDimensions)
-        window.removeEventListener('wheel', this.updateScale)
-    }
-
-    updateDimensions() {
-        this.props.setMapDimensions(window.innerWidth, window.innerHeight - NAVBAR_HEIGHT)
-    }
-
-    updateScale(e) {
-        this.props.zoomInOnPosition(e.deltaY < 0, this.state.mouseX, this.state.mouseY)
-    }
-
-    updateMousePosition() {
-        const mousePos = this.stage.getStage().getPointerPosition()
-        this.setState({ mouseX: mousePos.x, mouseY: mousePos.y })
-    }
 
-    handlers = {
-        MOVE_LEFT: () => this.moveWithDelta(MAP_MOVE_PIXELS_PER_EVENT, 0),
-        MOVE_RIGHT: () => this.moveWithDelta(-MAP_MOVE_PIXELS_PER_EVENT, 0),
-        MOVE_UP: () => this.moveWithDelta(0, MAP_MOVE_PIXELS_PER_EVENT),
-        MOVE_DOWN: () => this.moveWithDelta(0, -MAP_MOVE_PIXELS_PER_EVENT),
-    }
+        return () => {
+            window.removeEventListener('resize', updateDimensions)
+            window.removeEventListener('wheel', updateScale)
+        }
+    }, [])
 
-    moveWithDelta(deltaX, deltaY) {
-        this.props.setMapPositionWithBoundsCheck(this.props.mapPosition.x + deltaX, this.props.mapPosition.y + deltaY)
-    }
+    const store = useStore()
 
-    render() {
-        return (
-            <HotKeys handlers={this.handlers}>
-                <Stage
-                    ref={(stage) => {
-                        this.stage = stage
-                    }}
-                    width={this.props.mapDimensions.width}
-                    height={this.props.mapDimensions.height}
-                    onMouseMove={this.updateMousePosition.bind(this)}
-                >
-                    <Provider store={store}>
-                        <MapLayer />
-                        <RoomHoverLayer mouseX={this.state.mouseX} mouseY={this.state.mouseY} />
-                        <ObjectHoverLayer mouseX={this.state.mouseX} mouseY={this.state.mouseY} />
-                    </Provider>
-                </Stage>
-            </HotKeys>
-        )
-    }
+    return (
+        <HotKeys handlers={handlers} allowChanges={true}>
+            <Stage
+                ref={stage}
+                width={mapDimensions.width}
+                height={mapDimensions.height}
+                onMouseMove={updateMousePosition}
+            >
+                <Provider store={store}>
+                    <MapLayer />
+                    <RoomHoverLayer mouseX={x} mouseY={y} />
+                    <ObjectHoverLayer mouseX={x} mouseY={y} />
+                </Provider>
+            </Stage>
+        </HotKeys>
+    )
 }
 
 export default MapStageComponent
diff --git a/opendc-web/opendc-web-ui/src/components/app/sidebars/project/PortfolioListComponent.js b/opendc-web/opendc-web-ui/src/components/app/sidebars/project/PortfolioListComponent.js
index b000b9e2..b714a7d2 100644
--- a/opendc-web/opendc-web-ui/src/components/app/sidebars/project/PortfolioListComponent.js
+++ b/opendc-web/opendc-web-ui/src/components/app/sidebars/project/PortfolioListComponent.js
@@ -1,7 +1,7 @@
 import PropTypes from 'prop-types'
 import React from 'react'
 import Shapes from '../../../../shapes'
-import { Link } from 'react-router-dom'
+import Link from 'next/link'
 import FontAwesome from 'react-fontawesome'
 import ScenarioListContainer from '../../../../containers/app/sidebars/project/ScenarioListContainer'
 
@@ -44,11 +44,12 @@ class PortfolioListComponent extends React.Component {
                                 {portfolio.name}
                             </div>
                             <div className="col-5 text-right">
-                                <Link
-                                    className="btn btn-outline-primary mr-1 fa fa-play"
-                                    to={`/projects/${this.props.currentProjectId}/portfolios/${portfolio._id}`}
-                                    onClick={() => this.props.onChoosePortfolio(portfolio._id)}
-                                />
+                                <Link href={`/projects/${this.props.currentProjectId}/portfolios/${portfolio._id}`}>
+                                    <a
+                                        className="btn btn-outline-primary mr-1 fa fa-play"
+                                        onClick={() => this.props.onChoosePortfolio(portfolio._id)}
+                                    />
+                                </Link>
                                 <span
                                     className="btn btn-outline-danger fa fa-trash"
                                     onClick={() => this.onDelete(portfolio._id)}
diff --git a/opendc-web/opendc-web-ui/src/components/app/sidebars/project/ScenarioListComponent.js b/opendc-web/opendc-web-ui/src/components/app/sidebars/project/ScenarioListComponent.js
index e775a663..4efa99ef 100644
--- a/opendc-web/opendc-web-ui/src/components/app/sidebars/project/ScenarioListComponent.js
+++ b/opendc-web/opendc-web-ui/src/components/app/sidebars/project/ScenarioListComponent.js
@@ -1,7 +1,7 @@
 import PropTypes from 'prop-types'
 import React from 'react'
 import Shapes from '../../../../shapes'
-import { Link } from 'react-router-dom'
+import Link from 'next/link'
 import FontAwesome from 'react-fontawesome'
 
 class ScenarioListComponent extends React.Component {
@@ -34,10 +34,13 @@ class ScenarioListComponent extends React.Component {
                         </div>
                         <div className="col-5 text-right">
                             <Link
-                                className="btn btn-outline-primary mr-1 fa fa-play disabled"
-                                to={`/projects/${this.props.currentProjectId}/portfolios/${scenario.portfolioId}/scenarios/${scenario._id}`}
-                                onClick={() => this.props.onChooseScenario(scenario.portfolioId, scenario._id)}
-                            />
+                                href={`/projects/${this.props.currentProjectId}/portfolios/${scenario.portfolioId}/scenarios/${scenario._id}`}
+                            >
+                                <a
+                                    className="btn btn-outline-primary mr-1 fa fa-play disabled"
+                                    onClick={() => this.props.onChooseScenario(scenario.portfolioId, scenario._id)}
+                                />
+                            </Link>
                             <span
                                 className={'btn btn-outline-danger fa fa-trash ' + (idx === 0 ? 'disabled' : '')}
                                 onClick={() => (idx !== 0 ? this.onDelete(scenario._id) : undefined)}
diff --git a/opendc-web/opendc-web-ui/src/components/modals/ConfirmationModal.js b/opendc-web/opendc-web-ui/src/components/modals/ConfirmationModal.js
index 589047dc..5a95810a 100644
--- a/opendc-web/opendc-web-ui/src/components/modals/ConfirmationModal.js
+++ b/opendc-web/opendc-web-ui/src/components/modals/ConfirmationModal.js
@@ -2,36 +2,26 @@ import PropTypes from 'prop-types'
 import React from 'react'
 import Modal from './Modal'
 
-class ConfirmationModal extends React.Component {
-    static propTypes = {
-        title: PropTypes.string.isRequired,
-        message: PropTypes.string.isRequired,
-        show: PropTypes.bool.isRequired,
-        callback: PropTypes.func.isRequired,
-    }
-
-    onConfirm() {
-        this.props.callback(true)
-    }
-
-    onCancel() {
-        this.props.callback(false)
-    }
+function ConfirmationModal({ title, message, show, callback }) {
+    return (
+        <Modal
+            title={title}
+            show={show}
+            onSubmit={() => callback(true)}
+            onCancel={() => callback(false)}
+            submitButtonType="danger"
+            submitButtonText="Confirm"
+        >
+            {message}
+        </Modal>
+    )
+}
 
-    render() {
-        return (
-            <Modal
-                title={this.props.title}
-                show={this.props.show}
-                onSubmit={this.onConfirm.bind(this)}
-                onCancel={this.onCancel.bind(this)}
-                submitButtonType="danger"
-                submitButtonText="Confirm"
-            >
-                {this.props.message}
-            </Modal>
-        )
-    }
+ConfirmationModal.propTypes = {
+    title: PropTypes.string.isRequired,
+    message: PropTypes.string.isRequired,
+    show: PropTypes.bool.isRequired,
+    callback: PropTypes.func.isRequired,
 }
 
 export default ConfirmationModal
diff --git a/opendc-web/opendc-web-ui/src/components/navigation/AppNavbarComponent.js b/opendc-web/opendc-web-ui/src/components/navigation/AppNavbarComponent.js
index 8c28c542..7b1eaae2 100644
--- a/opendc-web/opendc-web-ui/src/components/navigation/AppNavbarComponent.js
+++ b/opendc-web/opendc-web-ui/src/components/navigation/AppNavbarComponent.js
@@ -1,6 +1,6 @@
 import React from 'react'
 import FontAwesome from 'react-fontawesome'
-import { Link } from 'react-router-dom'
+import Link from 'next/link'
 import { NavLink } from 'reactstrap'
 import Navbar, { NavItem } from './Navbar'
 import {} from './Navbar.module.scss'
@@ -8,16 +8,20 @@ import {} from './Navbar.module.scss'
 const AppNavbarComponent = ({ project, fullWidth }) => (
     <Navbar fullWidth={fullWidth}>
         <NavItem route="/projects">
-            <NavLink tag={Link} title="My Projects" to="/projects">
-                <FontAwesome name="list" className="mr-2" />
-                My Projects
-            </NavLink>
+            <Link href="/projects">
+                <NavLink title="My Projects">
+                    <FontAwesome name="list" className="mr-2" />
+                    My Projects
+                </NavLink>
+            </Link>
         </NavItem>
         {project ? (
             <NavItem>
-                <NavLink tag={Link} title="Current Project" to={`/projects/${project._id}`}>
-                    <span>{project.name}</span>
-                </NavLink>
+                <Link href={`/projects/${project._id}`}>
+                    <NavLink title="Current Project">
+                        <span>{project.name}</span>
+                    </NavLink>
+                </Link>
             </NavItem>
         ) : undefined}
     </Navbar>
diff --git a/opendc-web/opendc-web-ui/src/components/navigation/LogoutButton.js b/opendc-web/opendc-web-ui/src/components/navigation/LogoutButton.js
index 78b02b44..0c0feeb1 100644
--- a/opendc-web/opendc-web-ui/src/components/navigation/LogoutButton.js
+++ b/opendc-web/opendc-web-ui/src/components/navigation/LogoutButton.js
@@ -1,11 +1,10 @@
 import PropTypes from 'prop-types'
 import React from 'react'
 import FontAwesome from 'react-fontawesome'
-import { Link } from 'react-router-dom'
 import { NavLink } from 'reactstrap'
 
 const LogoutButton = ({ onLogout }) => (
-    <NavLink tag={Link} className="logout" title="Sign out" to="#" onClick={onLogout}>
+    <NavLink className="logout" title="Sign out" onClick={onLogout}>
         <FontAwesome name="power-off" size="lg" />
     </NavLink>
 )
diff --git a/opendc-web/opendc-web-ui/src/components/navigation/Navbar.js b/opendc-web/opendc-web-ui/src/components/navigation/Navbar.js
index bf18f1c4..90f55665 100644
--- a/opendc-web/opendc-web-ui/src/components/navigation/Navbar.js
+++ b/opendc-web/opendc-web-ui/src/components/navigation/Navbar.js
@@ -1,5 +1,6 @@
 import React, { useState } from 'react'
-import { Link, useLocation } from 'react-router-dom'
+import Link from 'next/link'
+import { useRouter } from 'next/router'
 import {
     Navbar as RNavbar,
     NavItem as RNavItem,
@@ -15,6 +16,7 @@ import Login from '../../containers/auth/Login'
 import Logout from '../../containers/auth/Logout'
 import ProfileName from '../../containers/auth/ProfileName'
 import { login, navbar, opendcBrand } from './Navbar.module.scss'
+import { useAuth } from '../../auth/hook'
 
 export const NAVBAR_HEIGHT = 60
 
@@ -24,32 +26,45 @@ const GitHubLink = () => (
         className="ml-2 mr-3 text-dark"
         style={{ position: 'relative', top: 7 }}
     >
-        <span className="fa fa-github fa-2x" />
+        <span aria-hidden className="fa fa-github fa-2x" />
     </a>
 )
 
 export const NavItem = ({ route, children }) => {
-    const location = useLocation()
-    return <RNavItem active={location.pathname === route}>{children}</RNavItem>
+    const router = useRouter()
+    const handleClick = (e) => {
+        e.preventDefault()
+        router.push(route)
+    }
+    return (
+        <RNavItem onClick={handleClick} active={router.asPath === route}>
+            {children}
+        </RNavItem>
+    )
 }
 
 export const LoggedInSection = () => {
-    const location = useLocation()
+    const router = useRouter()
+    const isLoggedIn = useAuth()
     return (
         <Nav navbar className="auth-links">
-            {userIsLoggedIn() ? (
+            {isLoggedIn ? (
                 [
-                    location.pathname === '/' ? (
+                    router.asPath === '/' ? (
                         <NavItem route="/projects" key="projects">
-                            <NavLink tag={Link} title="My Projects" to="/projects">
-                                My Projects
-                            </NavLink>
+                            <Link href="/projects">
+                                <NavLink title="My Projects" to="/projects">
+                                    My Projects
+                                </NavLink>
+                            </Link>
                         </NavItem>
                     ) : (
                         <NavItem route="/profile" key="profile">
-                            <NavLink tag={Link} title="My Profile" to="/profile">
-                                <ProfileName />
-                            </NavLink>
+                            <Link href="/profile">
+                                <NavLink title="My Profile">
+                                    <ProfileName />
+                                </NavLink>
+                            </Link>
                         </NavItem>
                     ),
                     <NavItem route="logout" key="logout">
@@ -57,10 +72,10 @@ export const LoggedInSection = () => {
                     </NavItem>,
                 ]
             ) : (
-                <NavItem route="login">
+                <RNavItem>
                     <GitHubLink />
                     <Login visible={true} className={login} />
-                </NavItem>
+                </RNavItem>
             )}
         </Nav>
     )
@@ -74,7 +89,7 @@ const Navbar = ({ fullWidth, children }) => {
         <RNavbar fixed="top" color="light" light expand="lg" id="navbar" className={navbar}>
             <Container fluid={fullWidth}>
                 <NavbarToggler onClick={toggle} />
-                <NavbarBrand tag={Link} to="/" title="OpenDC" className={opendcBrand}>
+                <NavbarBrand href="/" title="OpenDC" className={opendcBrand}>
                     <img src="/img/logo.png" alt="OpenDC" />
                 </NavbarBrand>
 
diff --git a/opendc-web/opendc-web-ui/src/components/not-found/TerminalWindow.js b/opendc-web/opendc-web-ui/src/components/not-found/TerminalWindow.js
index b38fc183..28fd81e9 100644
--- a/opendc-web/opendc-web-ui/src/components/not-found/TerminalWindow.js
+++ b/opendc-web/opendc-web-ui/src/components/not-found/TerminalWindow.js
@@ -1,5 +1,5 @@
 import React from 'react'
-import { Link } from 'react-router-dom'
+import Link from 'next/link'
 import BlinkingCursor from './BlinkingCursor'
 import CodeBlock from './CodeBlock'
 import { terminalWindow, terminalHeader, terminalBody, segfault, subTitle, homeBtn } from './TerminalWindow.module.scss'
@@ -23,8 +23,10 @@ const TerminalWindow = () => (
                 Got lost?
                 <BlinkingCursor />
             </div>
-            <Link to="/" className={homeBtn}>
-                <span className="fa fa-home" /> GET ME BACK TO OPENDC
+            <Link href="/">
+                <a className={homeBtn}>
+                    <span className="fa fa-home" /> GET ME BACK TO OPENDC
+                </a>
             </Link>
         </div>
     </div>
diff --git a/opendc-web/opendc-web-ui/src/components/projects/ProjectActionButtons.js b/opendc-web/opendc-web-ui/src/components/projects/ProjectActionButtons.js
index 1c76cc7f..48cce019 100644
--- a/opendc-web/opendc-web-ui/src/components/projects/ProjectActionButtons.js
+++ b/opendc-web/opendc-web-ui/src/components/projects/ProjectActionButtons.js
@@ -1,11 +1,13 @@
 import PropTypes from 'prop-types'
 import React from 'react'
-import { Link } from 'react-router-dom'
+import Link from 'next/link'
 
 const ProjectActionButtons = ({ projectId, onViewUsers, onDelete }) => (
     <td className="text-right">
-        <Link to={'/projects/' + projectId} className="btn btn-outline-primary btn-sm mr-2" title="Open this project">
-            <span className="fa fa-play" />
+        <Link href={`/projects/${projectId}`}>
+            <a className="btn btn-outline-primary btn-sm mr-2" title="Open this project">
+                <span className="fa fa-play" />
+            </a>
         </Link>
         <div
             className="btn btn-outline-success btn-sm disabled mr-2"