assets: assets to proper location

assets/js/set-theme.js

@@ -0,0 +1,40 @@
+function setTheme() {
+    const time = new Date();
+
+    const prev = localStorage.getItem('date');
+    const date = String(time.getMonth() + 1) + '.' + String(time.getDate());
+
+    const now = time.getTime();
+    let sunrise;
+    let sunset;
+
+    function setBodyClass() {
+        if (now > sunrise && now < sunset) return;
+        document.body.classList.add('dark');
+    }
+
+    if (date !== prev) {
+        fetch('https://api.ipgeolocation.io/astronomy?apiKey=5ed37d85103e4defa5df4c5298ed5215')
+            .then(res => res.json())
+            .then(data => {
+                sunrise = data.sunrise.split(':').map(Number);
+                sunset = data.sunset.split(':').map(Number);
+            })
+            .catch(() => {
+                sunrise = [7, 0];
+                sunset = [19, 0];
+            })
+            .finally(() => {
+                sunrise = time.setHours(sunrise[0], sunrise[1], 0);
+                sunset = time.setHours(sunset[0], sunset[1], 0);
+                setBodyClass();
+                localStorage.setItem('sunrise', sunrise);
+                localStorage.setItem('sunset', sunset);
+            });
+        localStorage.setItem('date', date);
+    } else {
+        sunrise = Number(localStorage.getItem('sunrise'));
+        sunset = Number(localStorage.getItem('sunset'));
+        setBodyClass();
+    }
+}