From 2e61cf3ede106ada67b9423c9e489012be78b102 Mon Sep 17 00:00:00 2001
From: Serraniel <mail@serraniel.dev>
Date: Wed, 23 Dec 2020 20:01:06 +0100
Subject: [PATCH] #109 Added observer to react to late changes of a badge class

---
 src/javascript/enhancements/fontColor.js | 42 +++++++++++++++++++++---
 1 file changed, 37 insertions(+), 5 deletions(-)

diff --git a/src/javascript/enhancements/fontColor.js b/src/javascript/enhancements/fontColor.js
index 54ea387..6d3ddeb 100644
--- a/src/javascript/enhancements/fontColor.js
+++ b/src/javascript/enhancements/fontColor.js
@@ -4,6 +4,8 @@ import * as core from '../utils/aniwatchCore';
 import * as helper from '../utils/helpers';
 
 const BADGE_CLASS = 'label';
+const DARKCOLOR_CLASS = 'awp-fontColor-dark';
+const __observedBadges = [];
 
 export function init() {
     getGlobalConfiguration().getProperty(SETTINGS_websiteOptimizeFontColors, value => {
@@ -24,27 +26,57 @@ export function init() {
 }
 
 function checkRunColorOptimization(node) {
-
     // run the scripts
     if (helper.isHtmlElement(node)) {
         if (node.classList.contains(BADGE_CLASS)) {
+            tryRegisterObserverForBadge(node);
             optimizeFontColorsBadges(node);
         }
         else {
             node.querySelectorAll(`.${BADGE_CLASS}`).forEach(element => {
+                tryRegisterObserverForBadge(element);
                 optimizeFontColorsBadges(element);
             });
         }
     }
 }
 
+function tryRegisterObserverForBadge(badge) {
+    // some badges change there color via late loading so we also have to observe the classlist
+    // example: Navigating from a list to an anime -> "Currently Airing" late loads the color badge
+    // this only happens when navigating from a list, direct loading works
+
+    if (__observedBadges.indexOf(badge) >= 0) {
+        return;
+    }
+
+    let obsever = new MutationObserver(mutations => {
+        mutations.forEach(mutation => {
+            // prevent recursive calls when our class is added / removed            
+            if ((mutation.oldValue?.indexOf(DARKCOLOR_CLASS) ?? -1 ^ mutation.target?.classList?.indexOf(DARKCOLOR_CLASS) ?? -1) === 0) {
+                return;
+            }
+            else {
+                optimizeFontColorsBadges(mutation.target);
+            }
+        });
+    });
+
+    obsever.observe(badge, {
+        attributes: true,
+        attributeFilter: ['class'],
+        attributeOldValue: true,
+    });
+
+    __observedBadges.push(badge);
+}
+
 function optimizeFontColorsBadges(badge) {
     let colorStr = window.getComputedStyle(badge, null).getPropertyValue('background-color');
 
-    if (colorStr.length > 0) { // some elements do not have a computed background color
+    // some elements do not have a computed background color
+    if (colorStr.length > 0) {
         let color = new Color(colorStr)
-        if (color.isLight()) {
-            badge.classList.add('awp-fontColor-dark')
-        }
+        badge.classList.toggle(DARKCOLOR_CLASS, color.isLight());
     }
 }
\ No newline at end of file