Extract Dark Theme controller

assets/controllers/dark_theme_controller.js

@@ -0,0 +1,39 @@
+import { Controller } from '@hotwired/stimulus';
+
+export default class extends Controller {
+  connect() {
+    this.#choose();
+
+    this.mql = window.matchMedia('(prefers-color-scheme: dark)');
+    this.mql.addEventListener('change', this.#choose.bind(this));
+  }
+
+  useLight() {
+    this.element.classList.remove('dark-theme');
+    document.cookie = 'theme=light;samesite=Lax;path=/;max-age=31536000';
+  }
+
+  useDark() {
+    this.element.classList.add('dark-theme');
+    document.cookie = 'theme=dark;samesite=Lax;path=/;max-age=31536000';
+  }
+
+  useAuto() {
+    document.cookie = 'theme=auto;samesite=Lax;path=/;max-age=0';
+    this.#choose();
+  }
+
+  #choose() {
+    const themeCookieExists = document.cookie.split(';').some((cookie) => cookie.trim().startsWith('theme='));
+
+    if (themeCookieExists) {
+      return;
+    }
+
+    if (this.mql.matches) {
+      this.element.classList.add('dark-theme');
+    } else {
+      this.element.classList.remove('dark-theme');
+    }
+  }
+}

assets/index.js

@@ -1,7 +1,5 @@
 import './bootstrap';
 
-import $ from 'jquery';
-
 /* Materialize imports */
 import '@materializecss/materialize/dist/css/materialize.css';
 import '@materializecss/materialize/dist/js/materialize';
@@ -23,108 +21,3 @@ import './js/shortcuts/entry';
 
 /* Theme style */
 import './scss/index.scss';
-
-(function darkTheme() {
-  const rootEl = document.querySelector('html');
-  const themeDom = {
-    darkClass: 'dark-theme',
-
-    toggleClass(el) {
-      return el.classList.toggle(this.darkClass);
-    },
-
-    addClass(el) {
-      return el.classList.add(this.darkClass);
-    },
-
-    removeClass(el) {
-      return el.classList.remove(this.darkClass);
-    },
-  };
-  const themeCookie = {
-    values: {
-      light: 'light',
-      dark: 'dark',
-    },
-
-    name: 'theme',
-
-    getValue(isDarkTheme) {
-      return isDarkTheme ? this.values.dark : this.values.light;
-    },
-
-    setCookie(isDarkTheme) {
-      const value = this.getValue(isDarkTheme);
-      document.cookie = `${this.name}=${value};samesite=Lax;path=/;max-age=31536000`;
-    },
-
-    removeCookie() {
-      document.cookie = `${this.name}=auto;samesite=Lax;path=/;max-age=0`;
-    },
-
-    exists() {
-      return document.cookie.split(';').some((cookie) => cookie.trim().startsWith(`${this.name}=`));
-    },
-  };
-  const preferedColorScheme = {
-    choose() {
-      const themeCookieExists = themeCookie.exists();
-      if (this.isAvailable() && !themeCookieExists) {
-        const isPreferedColorSchemeDark = window.matchMedia('(prefers-color-scheme: dark)').matches === true;
-        if (!themeCookieExists) {
-          themeDom[isPreferedColorSchemeDark ? 'addClass' : 'removeClass'](rootEl);
-        }
-      }
-    },
-
-    isAvailable() {
-      return typeof window.matchMedia === 'function';
-    },
-
-    init() {
-      if (!this.isAvailable()) {
-        return false;
-      }
-      this.choose();
-      window.matchMedia('(prefers-color-scheme: dark)').addListener(() => {
-        this.choose();
-      });
-      return true;
-    },
-  };
-
-  const addDarkThemeListeners = () => {
-    $(document).ready(() => {
-      const lightThemeButtons = document.querySelectorAll('.js-theme-toggle[data-theme="light"]');
-      [...lightThemeButtons].map((lightThemeButton) => {
-        lightThemeButton.addEventListener('click', (e) => {
-          e.preventDefault();
-          themeDom.removeClass(rootEl);
-          themeCookie.setCookie(false);
-        });
-        return true;
-      });
-      const darkThemeButtons = document.querySelectorAll('.js-theme-toggle[data-theme="dark"]');
-      [...darkThemeButtons].map((darkThemeButton) => {
-        darkThemeButton.addEventListener('click', (e) => {
-          e.preventDefault();
-          themeDom.addClass(rootEl);
-          themeCookie.setCookie(true);
-        });
-        return true;
-      });
-      const autoThemeButtons = document.querySelectorAll('.js-theme-toggle[data-theme="auto"]');
-      [...autoThemeButtons].map((autoThemeButton) => {
-        autoThemeButton.addEventListener('click', (e) => {
-          e.preventDefault();
-          themeCookie.removeCookie();
-          preferedColorScheme.choose();
-        });
-        return true;
-      });
-    });
-  };
-
-  preferedColorScheme.init();
-  addDarkThemeListeners();
-}());