From cabe36c822865b0159487461ca41710ca63953af Mon Sep 17 00:00:00 2001
From: Lukas Kucharczyk <lukas@kucharczyk.xyz>
Date: Fri, 9 Aug 2024 12:22:26 +0200
Subject: [PATCH] add dark/light mode toggle

---
 games/templates/base.html | 71 ++++++++++++++++++++++++++++++++++++++-
 1 file changed, 70 insertions(+), 1 deletion(-)
diff --git a/games/templates/base.html b/games/templates/base.html
index ee17f8d..be8d84a 100644
--- a/games/templates/base.html
+++ b/games/templates/base.html
@@ -16,8 +16,16 @@
         {% django_htmx_script %}
         <link rel="stylesheet" href="{% static 'base.css' %}" />
         <script src="https://cdn.jsdelivr.net/npm/flowbite@2.4.1/dist/flowbite.min.js"></script>
+        <script>
+        // On page load or when changing themes, best to add inline in `head` to avoid FOUC
+        if (localStorage.getItem('color-theme') === 'dark' || (!('color-theme' in localStorage) && window.matchMedia('(prefers-color-scheme: dark)').matches)) {
+            document.documentElement.classList.add('dark');
+        } else {
+            document.documentElement.classList.remove('dark')
+        }
+        </script>
     </head>
-    <body class="dark" hx-indicator="#indicator">
+    <body hx-indicator="#indicator">
         <img id="indicator"
              src="{% static 'icons/loading.png' %}"
              class="absolute right-3 top-3 animate-spin htmx-indicator"
@@ -39,6 +47,25 @@
                     </a>
                     <div class="w-full md:block md:w-auto">
                         <ul class="flex flex-col md:flex-row p-4 mt-4 dark:text-white">
+                            <button id="theme-toggle"
+                                    type="button"
+                                    class="text-gray-500 dark:text-gray-400 hover:bg-gray-100 dark:hover:bg-gray-700 focus:outline-none focus:ring-4 focus:ring-gray-200 dark:focus:ring-gray-700 rounded-lg text-sm p-2.5">
+                                <svg id="theme-toggle-dark-icon"
+                                     class="hidden w-5 h-5"
+                                     fill="currentColor"
+                                     viewBox="0 0 20 20"
+                                     xmlns="http://www.w3.org/2000/svg">
+                                    <path d="M17.293 13.293A8 8 0 016.707 2.707a8.001 8.001 0 1010.586 10.586z"></path>
+                                </svg>
+                                <svg id="theme-toggle-light-icon"
+                                     class="hidden w-5 h-5"
+                                     fill="currentColor"
+                                     viewBox="0 0 20 20"
+                                     xmlns="http://www.w3.org/2000/svg">
+                                    <path d="M10 2a1 1 0 011 1v1a1 1 0 11-2 0V3a1 1 0 011-1zm4 8a4 4 0 11-8 0 4 4 0 018 0zm-.464 4.95l.707.707a1 1 0 001.414-1.414l-.707-.707a1 1 0 00-1.414 1.414zm2.12-10.607a1 1 0 010 1.414l-.706.707a1 1 0 11-1.414-1.414l.707-.707a1 1 0 011.414 0zM17 11a1 1 0 100-2h-1a1 1 0 100 2h1zm-7 4a1 1 0 011 1v1a1 1 0 11-2 0v-1a1 1 0 011-1zM5.05 6.464A1 1 0 106.465 5.05l-.708-.707a1 1 0 00-1.414 1.414l.707.707zm1.414 8.486l-.707.707a1 1 0 01-1.414-1.414l.707-.707a1 1 0 011.414 1.414zM4 11a1 1 0 100-2H3a1 1 0 000 2h1z" fill-rule="evenodd" clip-rule="evenodd">
+                                    </path>
+                                </svg>
+                            </button>
                             <li class="relative group">
                                 {% if user.is_authenticated %}
                                     <a class="block py-2 pl-3 pr-4 hover:underline"
@@ -119,5 +146,47 @@
         </div>
         {% block scripts %}
         {% endblock scripts %}
+        <script>
+        var themeToggleDarkIcon = document.getElementById('theme-toggle-dark-icon');
+        var themeToggleLightIcon = document.getElementById('theme-toggle-light-icon');
+
+        // Change the icons inside the button based on previous settings
+        if (localStorage.getItem('color-theme') === 'dark' || (!('color-theme' in localStorage) && window.matchMedia('(prefers-color-scheme: dark)').matches)) {
+            themeToggleLightIcon.classList.remove('hidden');
+        } else {
+            themeToggleDarkIcon.classList.remove('hidden');
+        }
+
+        var themeToggleBtn = document.getElementById('theme-toggle');
+
+        themeToggleBtn.addEventListener('click', function () {
+
+            // toggle icons inside button
+            themeToggleDarkIcon.classList.toggle('hidden');
+            themeToggleLightIcon.classList.toggle('hidden');
+
+            // if set via local storage previously
+            if (localStorage.getItem('color-theme')) {
+                if (localStorage.getItem('color-theme') === 'light') {
+                    document.documentElement.classList.add('dark');
+                    localStorage.setItem('color-theme', 'dark');
+                } else {
+                    document.documentElement.classList.remove('dark');
+                    localStorage.setItem('color-theme', 'light');
+                }
+
+                // if NOT set via local storage previously
+            } else {
+                if (document.documentElement.classList.contains('dark')) {
+                    document.documentElement.classList.remove('dark');
+                    localStorage.setItem('color-theme', 'light');
+                } else {
+                    document.documentElement.classList.add('dark');
+                    localStorage.setItem('color-theme', 'dark');
+                }
+            }
+
+        });
+        </script>
     </body>
 </html>
