From ec5e43889f2a724b9fc173b1b93ed90a3da826d9 Mon Sep 17 00:00:00 2001
From: dbroqua <contact@darkou.fr>
Date: Wed, 2 Aug 2023 16:05:08 +0200
Subject: [PATCH] =?UTF-8?q?#88=20-=20Am=C3=A9liorer=20le=20switch=20sur=20?=
 =?UTF-8?q?le=20th=C3=A8me?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 javascripts/main.js  | 66 ----------------------------------------
 javascripts/theme.js | 71 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 71 insertions(+), 66 deletions(-)
 create mode 100644 javascripts/theme.js

diff --git a/javascripts/main.js b/javascripts/main.js
index 08e5677..d37f297 100644
--- a/javascripts/main.js
+++ b/javascripts/main.js
@@ -43,53 +43,6 @@ function hideToastr() {
     x.getElementsByTagName("SPAN")[0].innerHTML = "";
 }
 
-/**
- * Fonction permettant de récupérer la valeur d'un cookie
- * @param {String} cname
- * @param {String} defaultValue
- *
- * @return {String}
- */
-function getCookie(cname, defaultValue = "false") {
-    const name = `${cname}=`;
-    const decodedCookie = decodeURIComponent(document.cookie);
-    const ca = decodedCookie.split(";");
-    for (let i = 0; i < ca.length; i += 1) {
-        let c = ca[i];
-        while (c.charAt(0) === " ") {
-            c = c.substring(1);
-        }
-        if (c.indexOf(name) === 0) {
-            return c.substring(name.length, c.length);
-        }
-    }
-    return defaultValue;
-}
-
-/**
- * Fonction permettant de créer un cookie
- * @param {String} cname
- * @param {String} cvalue
- * @param {Number} exdays
- */
-function setCookie(cname, cvalue, exdays = 30) {
-    const d = new Date();
-    d.setTime(d.getTime() + exdays * 24 * 60 * 60 * 1000);
-    const expires = `expires=${d.toUTCString()}`;
-    document.cookie = `${cname}=${cvalue};${expires};path=/`;
-}
-
-/**
- * Fonction permettant de switcher de thème clair/sombre
- * @param {Object} e
- */
-function switchTheme(e) {
-    const theme = e.target.checked ? "dark" : "light";
-
-    document.documentElement.setAttribute("data-theme", theme);
-    setCookie("theme", theme);
-}
-
 /**
  * Ensemble d'actions effectuées au chargement de la page
  */
@@ -109,23 +62,4 @@ document.addEventListener("DOMContentLoaded", () => {
             });
         });
     }
-
-    const toggleSwitch = document.querySelector(
-        '.theme-switch input[type="checkbox"]'
-    );
-    if (toggleSwitch) {
-        toggleSwitch.addEventListener("change", switchTheme, false);
-    }
-
-    let currentThemeIsDark = getCookie("theme");
-    if (currentThemeIsDark === "false" && window.matchMedia) {
-        currentThemeIsDark = window.matchMedia("(prefers-color-scheme: dark)")
-            .matches
-            ? "dark"
-            : "light";
-    }
-    switchTheme({ target: { checked: currentThemeIsDark === "dark" } });
-    if (toggleSwitch) {
-        toggleSwitch.checked = currentThemeIsDark === "dark";
-    }
 });
diff --git a/javascripts/theme.js b/javascripts/theme.js
new file mode 100644
index 0000000..4625673
--- /dev/null
+++ b/javascripts/theme.js
@@ -0,0 +1,71 @@
+/**
+ * Fonction permettant de sauvegarder dans le stockage local le choix du thème
+ * @param {String} scheme
+ */
+function saveColorScheme(scheme) {
+    localStorage.setItem("theme", scheme);
+}
+
+/**
+ * Fonction permettant de changer le thème du site
+ * @param {String} scheme
+ */
+function setColorScheme(scheme) {
+    document.documentElement.setAttribute("data-theme", scheme);
+}
+
+/**
+ * Fonction permettant de récupérer le thème du système
+ * @return {String}
+ */
+function getPreferredColorScheme() {
+    if (window.matchMedia) {
+        if (window.matchMedia("(prefers-color-scheme: dark)").matches) {
+            return "dark";
+        }
+        return "light";
+    }
+    return "light";
+}
+
+// INFO: On place un event sur le bouton
+const toggleSwitch = document.querySelector(
+    '.theme-switch input[type="checkbox"]'
+);
+
+/**
+ * Event permettant de détecter les changements de thème du système
+ */
+if (window.matchMedia) {
+    const colorSchemeQuery = window.matchMedia("(prefers-color-scheme: dark)");
+    colorSchemeQuery.addEventListener("change", () => {
+        const selectedColorScheme = localStorage.getItem("theme") || "system";
+
+        if (selectedColorScheme === "system") {
+            const preferedColorScheme = getPreferredColorScheme();
+            setColorScheme(preferedColorScheme);
+
+            toggleSwitch.checked = preferedColorScheme === "dark";
+        }
+    });
+}
+
+const currentTheme = localStorage.getItem("theme") || getPreferredColorScheme();
+
+// INFO: Au chargement de la page on détecte le thème à charger
+setColorScheme(currentTheme);
+
+toggleSwitch.checked = currentTheme === "dark";
+
+toggleSwitch.addEventListener(
+    "change",
+    (e) => {
+        e.preventDefault();
+
+        const scheme = e.target.checked ? "dark" : "light";
+
+        saveColorScheme(scheme);
+        setColorScheme(scheme);
+    },
+    false
+);