added theme dark mode toggle in settings

package.json

@@ -13,6 +13,7 @@
   },
   "private": true,
   "dependencies": {
+    "@flare/js-utils": "^1.0.3",
     "@flare/tuitio-client-react": "^1.0.1",
     "@material-ui/core": "^4.11.2",
     "@material-ui/icons": "^4.11.2",

src/features/machines/components/MachinesContainer.js

@@ -2,7 +2,7 @@ import React, { useContext, useEffect, useCallback } from "react";
 import {
   ApplicationStateContext,
   ApplicationDispatchContext
-} from "../../../state/ApplicationContexts";
+} from "../../../state/contexts";
 import useApi from "../../../api";
 import MachinesList from "./MachinesList";
 import PageTitle from "../../../components/common/PageTitle";

src/features/settings/components/SettingsContainer.js

@@ -1,8 +1,14 @@
 import React from "react";
 import LanguageContainer from "./language/LanguageContainer";
+import ThemeSettings from "./ThemeSettings";
 
 const SettingsContainer = () => {
-  return <LanguageContainer />;
+  return (
+    <>
+      <LanguageContainer />
+      <ThemeSettings />
+    </>
+  );
 };
 
 export default SettingsContainer;

src/features/settings/components/ThemeSettings.js

@@ -0,0 +1,23 @@
+import React from "react";
+import { useApplicationTheme } from "../../../providers/ThemeProvider";
+import { Switch } from "@material-ui/core";
+
+const ThemeSettings = () => {
+  const { isDark, onDarkModeChanged } = useApplicationTheme();
+
+  const handleChange = event => {
+    const { checked } = event.target;
+    onDarkModeChanged(checked);
+  };
+
+  return (
+    <Switch
+      checked={isDark}
+      onChange={handleChange}
+      color="primary"
+      name="app-theme-switch"
+    />
+  );
+};
+
+export default ThemeSettings;

src/index.js

@@ -1,7 +1,6 @@
 import React, { Suspense } from "react";
 import ReactDOM from "react-dom";
-import { ThemeProvider } from "@material-ui/styles";
-import Themes from "./themes";
+import ThemeProvider from "./providers/ThemeProvider";
 import CssBaseline from "@material-ui/core/CssBaseline";
 import App from "./components/App";
 import { TuitioProvider } from "@flare/tuitio-client-react";
@@ -12,7 +11,7 @@ import "./utils/i18n";
 ReactDOM.render(
   <TuitioProvider tuitioUrl={process.env.REACT_APP_TUITIO_URL}>
     <ApplicationStateProvider>
-      <ThemeProvider theme={Themes.default}>
+      <ThemeProvider>
         <CssBaseline />
         <Suspense fallback={<div>Loading...</div>}>
           <ToastProvider>

src/providers/ApplicationStateProvider.js

@@ -3,7 +3,7 @@ import PropTypes from "prop-types";
 import {
   ApplicationStateContext,
   ApplicationDispatchContext
-} from "../state/ApplicationContexts";
+} from "../state/contexts";
 import {
   reducer,
   dispatchActions as reducerDispatchActions

src/providers/ThemeProvider.js

@@ -0,0 +1,82 @@
+import React, { useReducer, useMemo, useContext } from "react";
+import PropTypes from "prop-types";
+import { ThemeProvider as MuiThemeProvider } from "@material-ui/styles";
+import { localStorage } from "@flare/js-utils";
+import { getThemes } from "../themes";
+
+const ApplicationThemeContext = React.createContext();
+const LOCAL_STORAGE_COLOR_SCHEME_KEY = "network-resurrector-color-scheme";
+
+const COLOR_SCHEME = {
+  LIGHT: "light",
+  DARK: "dark"
+};
+
+const colorScheme = localStorage.getItem(LOCAL_STORAGE_COLOR_SCHEME_KEY);
+const prefersDarkMode = window.matchMedia(
+  "(prefers-color-scheme: dark)"
+).matches;
+
+const initialState = {
+  scheme:
+    colorScheme ?? (prefersDarkMode ? COLOR_SCHEME.DARK : COLOR_SCHEME.LIGHT)
+};
+
+const reducer = (state = initialState, action) => {
+  switch (action.type) {
+    case "onColorSchemeChanged": {
+      return {
+        ...state,
+        scheme: action.scheme
+      };
+    }
+    default: {
+      return state;
+    }
+  }
+};
+
+const dispatchActions = dispatch => ({
+  onColorSchemeChanged: scheme => {
+    dispatch({ type: "onColorSchemeChanged", scheme });
+    localStorage.setItem(LOCAL_STORAGE_COLOR_SCHEME_KEY, scheme);
+  }
+});
+
+const useApplicationTheme = () => {
+  const { state, actions } = useContext(ApplicationThemeContext);
+  const { onColorSchemeChanged } = actions;
+
+  const { scheme } = state;
+  const onDarkModeChanged = active =>
+    onColorSchemeChanged(active ? COLOR_SCHEME.DARK : COLOR_SCHEME.LIGHT);
+
+  return { isDark: scheme === COLOR_SCHEME.DARK, onDarkModeChanged };
+};
+
+const ThemeProvider = ({ children }) => {
+  const [state, dispatch] = useReducer(reducer, initialState);
+  const actions = useMemo(() => dispatchActions(dispatch), [dispatch]);
+  const themes = useMemo(
+    () => getThemes(state.scheme === COLOR_SCHEME.DARK),
+    [state.scheme]
+  );
+
+  return (
+    <ApplicationThemeContext.Provider
+      value={{
+        state,
+        actions
+      }}
+    >
+      <MuiThemeProvider theme={themes.default}>{children}</MuiThemeProvider>
+    </ApplicationThemeContext.Provider>
+  );
+};
+
+ThemeProvider.propTypes = {
+  children: PropTypes.node.isRequired
+};
+
+export { ThemeProvider, ApplicationThemeContext, useApplicationTheme };
+export default ThemeProvider;

src/themes/index.js

@@ -1,12 +1,7 @@
 import defaultTheme from "./default";
 import { createTheme } from "@material-ui/core/styles";
 
-const prefersDarkMode = false;
-
 const overrides = {
-  palette: {
-    type: prefersDarkMode ? "dark" : "light"
-  },
   typography: {
     h1: {
       fontSize: "3rem"
@@ -29,12 +24,16 @@ const overrides = {
   }
 };
 
-const themes = {
-  default: createTheme({
-    ...defaultTheme,
-    ...overrides,
-    palette: { ...defaultTheme.palette, ...overrides.palette }
-  })
+const getThemes = darkMode => {
+  const type = darkMode ? "dark" : "light";
+
+  return {
+    default: createTheme({
+      ...defaultTheme,
+      ...overrides,
+      palette: { ...defaultTheme.palette, type }
+    })
+  };
 };
 
-export default themes;
+export { getThemes };