svg theme changer

static/js/cours.js

@@ -80,11 +80,16 @@ const deepestNodeOpened = (path, options) => {
   }
 };
 
-const svgDarkTheme = () => {
+const Mode = {
+  Light: 1,
+  Dark: 2,
+};
+
+const svgChangeTheme = (mode) => {
   for (const item of document.getElementsByTagName("img")) {
     if (!item.src.startsWith("data:image/svg+xml;base64,")) {
       // Exclude image who aren't SVG and base64 encoded
-      break;
+      continue;
     }
 
     /** Convert to grayscale */
@@ -129,9 +134,19 @@ const svgDarkTheme = () => {
     const totalGrayscale = grayscaleValues.reduce((acc, val) => acc + val, 0);
     const averageGrayscale = totalGrayscale / grayscaleValues.length;
 
-    if (averageGrayscale < 128) {
+    const treshold = 128;
+
+    if (averageGrayscale < treshold && mode === Mode.Dark) {
       item.style = "filter: invert(1);";
+      continue;
     }
+
+    if (averageGrayscale > treshold && mode === Mode.Light) {
+      item.style = "filter: invert(1);";
+      continue;
+    }
+
+    item.style = "";
   }
 };
 
@@ -160,13 +175,16 @@ window.addEventListener("load", () => {
     uncollapse(last_openeded);
   }
 
-  // Fix SVG images in dark mode
-  if (window.matchMedia("(prefers-color-scheme: dark)").matches) {
-    svgDarkTheme();
-  }
+  // Fix SVG images
+  svgChangeTheme(
+    window.matchMedia("(prefers-color-scheme: dark)").matches
+      ? Mode.Dark
+      : Mode.Light
+  );
 });
 
-// Is this working?
 window
   .matchMedia("(prefers-color-scheme: dark)")
-  .addEventListener("change", svgDarkTheme);
+  .addEventListener("change", (event) =>
+    svgChangeTheme(event.matches ? Mode.Dark : Mode.Light)
+  );