From 9861aeda7fe23363e70997d98d276eb958f61adc Mon Sep 17 00:00:00 2001
From: developomp <developomp@gmail.com>
Date: Sat, 26 Mar 2022 17:37:40 +0900
Subject: [PATCH] moved global state loic to separate file - moved related
 types and interfaces too

---
 src/App.tsx                | 29 ++++-----------
 src/globalContext.tsx      | 76 ++++++++++++++++++++++++++++++++++++++
 src/index.tsx              | 13 ++++---
 types/styled-components.ts |  7 ++--
 4 files changed, 95 insertions(+), 30 deletions(-)
 create mode 100644 src/globalContext.tsx

diff --git a/src/App.tsx b/src/App.tsx
index 866aac2..cc1e76e 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,12 +1,9 @@
-import { useEffect, useState } from "react"
+import { useContext, useEffect, useState } from "react"
 import { Routes, Route } from "react-router-dom"
 import styled, { ThemeProvider } from "styled-components"
 import { Helmet } from "react-helmet-async"
-import storage from "local-storage-fallback"
 import { isIE } from "react-device-detect"
 
-import { ThemeType } from "../types/styled-components"
-
 import Loading from "./components/Loading"
 import Navbar from "./components/Navbar"
 import Footer from "./components/Footer"
@@ -20,6 +17,8 @@ import Portfolio from "./pages/Portfolio"
 import theming from "./styles/theming"
 import GlobalStyle from "./styles/globalStyle"
 
+import { ActionsEnum, globalContext } from "./globalContext"
+
 const IENotSupported = styled.p`
 	margin: auto;
 	font-size: 2rem;
@@ -34,17 +33,12 @@ const StyledContentContainer = styled.div`
 	margin-top: 5rem;
 `
 
-const App = () => {
+export default function App() {
+	const { globalState, dispatch } = useContext(globalContext)
 	const [isLoading, setIsLoading] = useState(true)
-	const [currentTheme, setCurrentTheme] = useState<ThemeType>(
-		(storage.getItem("theme") || "dark") as ThemeType // get theme from storage and set to "dark" mode if not set already
-	)
 
+	// set loading to false if all fonts are loaded
 	useEffect(() => {
-		// show loading screen until all fonts are loaded.
-		// Experimental feature. Not fully supported on all browsers (IE, I'm looking at you).
-		// https://developer.mozilla.org/en-US/docs/Web/API/FontFaceSet
-
 		// checks if document.fonts.onloadingdone is supported on the browser
 		if (typeof document.fonts.onloadingdone != undefined) {
 			document.fonts.onloadingdone = () => {
@@ -55,11 +49,6 @@ const App = () => {
 		}
 	}, [])
 
-	useEffect(() => {
-		// save theme when it is changed
-		storage.setItem("theme", currentTheme)
-	}, [currentTheme])
-
 	if (isIE)
 		return (
 			<IENotSupported>
@@ -70,9 +59,9 @@ const App = () => {
 	return (
 		<ThemeProvider
 			theme={{
-				currentTheme: currentTheme,
+				currentTheme: globalState.theme,
 				setTheme(setThemeTo) {
-					setCurrentTheme(setThemeTo)
+					dispatch({ type: ActionsEnum.UPDATE_THEME, payload: setThemeTo })
 				},
 			}}
 		>
@@ -104,5 +93,3 @@ const App = () => {
 		</ThemeProvider>
 	)
 }
-
-export default App
diff --git a/src/globalContext.tsx b/src/globalContext.tsx
new file mode 100644
index 0000000..5814fd8
--- /dev/null
+++ b/src/globalContext.tsx
@@ -0,0 +1,76 @@
+import { createContext, useEffect, useReducer } from "react"
+import storage from "local-storage-fallback"
+
+import type { Dispatch, ReactNode, ReactElement } from "react"
+
+export type SiteLocale = "en" | "kr"
+export type SiteTheme = "dark" | "light"
+
+export enum ActionsEnum {
+	UPDATE_THEME,
+	UPDATE_LOCALE,
+}
+
+export interface IGlobalState {
+	locale: SiteLocale
+	theme: SiteTheme
+}
+
+export type GlobalAction =
+	| {
+			type: ActionsEnum.UPDATE_THEME
+			payload: SiteTheme
+	  }
+	| {
+			type: ActionsEnum.UPDATE_LOCALE
+			payload: SiteLocale
+	  }
+
+export interface IGlobalContext {
+	globalState: IGlobalState
+	dispatch: Dispatch<GlobalAction>
+}
+
+const defaultState: IGlobalState = {
+	locale: (storage.getItem("locale") || "en") as SiteLocale,
+	theme: (storage.getItem("theme") || "dark") as SiteTheme,
+}
+
+export const globalContext = createContext({} as IGlobalContext)
+
+function reducer(state = defaultState, action: GlobalAction): IGlobalState {
+	switch (action.type) {
+		case ActionsEnum.UPDATE_THEME:
+			state.theme = action.payload
+			break
+
+		case ActionsEnum.UPDATE_LOCALE:
+			state.locale = action.payload
+			break
+
+		default:
+			break
+	}
+
+	return { ...state }
+}
+
+export function GlobalStore(props: { children: ReactNode }): ReactElement {
+	const [globalState, dispatch] = useReducer(reducer, defaultState)
+
+	// save theme when it is changed
+	useEffect(() => {
+		storage.setItem("theme", globalState.theme)
+	}, [globalState.theme])
+
+	// save locale when it is changed
+	useEffect(() => {
+		storage.setItem("locale", globalState.locale)
+	}, [globalState.locale])
+
+	return (
+		<globalContext.Provider value={{ globalState, dispatch }}>
+			{props.children}
+		</globalContext.Provider>
+	)
+}
diff --git a/src/index.tsx b/src/index.tsx
index 0f5fe58..092e55f 100644
--- a/src/index.tsx
+++ b/src/index.tsx
@@ -2,16 +2,19 @@ import React from "react"
 import ReactDOM from "react-dom"
 import { HelmetProvider } from "react-helmet-async"
 import { BrowserRouter } from "react-router-dom"
+import { GlobalStore } from "./globalContext"
 
 import App from "./App"
 
 ReactDOM.render(
 	<React.StrictMode>
-		<BrowserRouter>
-			<HelmetProvider>
-				<App />
-			</HelmetProvider>
-		</BrowserRouter>
+		<GlobalStore>
+			<BrowserRouter>
+				<HelmetProvider>
+					<App />
+				</HelmetProvider>
+			</BrowserRouter>
+		</GlobalStore>
 	</React.StrictMode>,
 	document.getElementById("root")
 )
diff --git a/types/styled-components.ts b/types/styled-components.ts
index 8ad51f8..db2c3e9 100644
--- a/types/styled-components.ts
+++ b/types/styled-components.ts
@@ -1,10 +1,9 @@
 import "styled-components"
-
-export type ThemeType = "dark" | "light"
+import type { SiteTheme } from "../src/globalContext"
 
 declare module "styled-components" {
 	export interface DefaultTheme {
-		currentTheme: ThemeType
-		setTheme(setThemeTo: ThemeType): void
+		currentTheme: SiteTheme
+		setTheme(setThemeTo: SiteTheme): void
 	}
 }