modularized with a heartbeat range util

server/routers/status-page-router.js

@@ -3,6 +3,7 @@ const apicache = require("../modules/apicache");
 const { UptimeKumaServer } = require("../uptime-kuma-server");
 const StatusPage = require("../model/status_page");
 const { allowDevAllOrigin, sendHttpError } = require("../util-server");
+const { rangeToDatabaseDate } = require("../util/heartbeat-range");
 const { R } = require("redbean-node");
 const { badgeConstants } = require("../../src/util");
 const { makeBadge } = require("badge-maker");
@@ -89,28 +90,7 @@ router.get("/api/status-page/heartbeat/:slug", cache("1 minutes"), async (reques
         let heartbeatRange = statusPage ? statusPage.heartbeat_bar_range : "auto";
 
         // Calculate the date range for heartbeats based on range setting
-        let dateFrom = null;
-        if (heartbeatRange === "auto") {
-            // Auto mode: limit to last 100 beats (original behavior)
-            dateFrom = null;
-        } else if (heartbeatRange.endsWith("h")) {
-            // Hours
-            let hours = parseInt(heartbeatRange);
-            let date = new Date();
-            date.setHours(date.getHours() - hours);
-            dateFrom = date.toISOString().slice(0, 19).replace('T', ' ');
-        } else if (heartbeatRange.endsWith("d")) {
-            // Days
-            let days = parseInt(heartbeatRange);
-            let date = new Date();
-            date.setDate(date.getDate() - days);
-            dateFrom = date.toISOString().slice(0, 19).replace('T', ' ');
-        } else {
-            // Fallback to 90 days
-            let date = new Date();
-            date.setDate(date.getDate() - 90);
-            dateFrom = date.toISOString().slice(0, 19).replace('T', ' ');
-        }
+        let dateFrom = rangeToDatabaseDate(heartbeatRange);
 
         for (let monitorID of monitorIDList) {
             let list;

server/util/heartbeat-range.js

@@ -0,0 +1,44 @@
+/**
+ * Utility functions for heartbeat range handling
+ */
+
+/**
+ * Parse heartbeat range string and return hours
+ * @param {string} range - Range string like "6h", "7d", "auto"
+ * @returns {number|null} Hours or null for auto
+ */
+function parseRangeHours(range) {
+    if (!range || range === "auto") {
+        return null;
+    }
+    
+    if (range.endsWith("h")) {
+        return parseInt(range);
+    } else if (range.endsWith("d")) {
+        return parseInt(range) * 24;
+    }
+    
+    // Fallback
+    return 90 * 24;
+}
+
+/**
+ * Convert range to database-compatible date string
+ * @param {string} range - Range string like "6h", "7d", "auto"
+ * @returns {string|null} Date string or null for auto
+ */
+function rangeToDatabaseDate(range) {
+    const hours = parseRangeHours(range);
+    if (hours === null) {
+        return null;
+    }
+    
+    const date = new Date();
+    date.setHours(date.getHours() - hours);
+    return date.toISOString().slice(0, 19).replace('T', ' ');
+}
+
+module.exports = {
+    parseRangeHours,
+    rangeToDatabaseDate
+};

src/components/HeartbeatBar.vue

@@ -137,22 +137,19 @@ export default {
             const buckets = [];
 
             // Parse the range to get total time and determine bucket size
+            // Parse range to get total hours
             let totalHours;
-            let bucketSize; // in hours
-            let totalBuckets = this.maxBeat || 50; // Use maxBeat to determine bucket count
-
             if (this.heartbeatBarRange.endsWith("h")) {
                 totalHours = parseInt(this.heartbeatBarRange);
             } else if (this.heartbeatBarRange.endsWith("d")) {
-                const days = parseInt(this.heartbeatBarRange);
-                totalHours = days * 24;
+                totalHours = parseInt(this.heartbeatBarRange) * 24;
             } else {
-                // Fallback
-                totalHours = 90 * 24;
+                totalHours = 90 * 24; // Fallback
             }
 
-            // Calculate bucket size to fit the desired number of buckets
-            bucketSize = totalHours / totalBuckets;
+            // Calculate bucket size and count
+            const totalBuckets = this.maxBeat || 50;
+            const bucketSize = totalHours / totalBuckets;
 
             // Create time buckets from oldest to newest
             const startTime = now.subtract(totalHours, "hours");