From 9d8f4fc1ef8ca923771e1c298571690bcfb951cd Mon Sep 17 00:00:00 2001
From: AloeSapling <aloesapling@gmail.com>
Date: Sat, 23 Aug 2025 15:03:09 +0200
Subject: [PATCH] Added a guard against multiple blue marble instances

---
 src/main.ts | 105 +++++++++++++++++++++++++++-------------------------
 1 file changed, 55 insertions(+), 50 deletions(-)

diff --git a/src/main.ts b/src/main.ts
index 9187904..140f5aa 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -9,22 +9,22 @@ import UIManager from "./uiManager.ts";
 import "@placecharity/framework-types"
 
 const DUMMY_DATA = {
-    whoami: "BlueMarble",
-    schemaVersion: "",
-    templates: [
-        {
-            coords: [0, 1, 2, 3],
-            enabled: false,
-            uuid: "BLAJSIAFBNIUBAWIFIOANWA",
-        },
-        {
-            coords: [0, 1, 2, 3],
-            name: "Test",
-            enabled: false,
-            authorID: 54,
-            uuid: "BLAJSIAFBNIUBAWIFIOANWA",
-        }
-    ]
+whoami: "BlueMarble",
+schemaVersion: "",
+templates: [
+    {
+        coords: [0, 1, 2, 3],
+        enabled: false,
+        uuid: "BLAJSIAFBNIUBAWIFIOANWA",
+    },
+    {
+        coords: [0, 1, 2, 3],
+        name: "Test",
+        enabled: false,
+        authorID: 54,
+        uuid: "BLAJSIAFBNIUBAWIFIOANWA",
+    }
+]
 }
 const storageData: TBlueMarbleJSON | undefined = DUMMY_DATA // data should be data gotten from storage
 
@@ -32,40 +32,45 @@ export const dataManager = new DataManager(storageData);
 // export const dataManager = new DataManager(EMPTY_BLUE_MARBLE_JSON);
 export const uiManager = new UIManager();
 
-
-const params = new URLSearchParams(document.location.search); // Gets the url search query
-if (params.has("bmShare")) {
-    try {
-        const json = JSON.parse(params.get("bmShare")!)
-        dataManager.appendData(json)
-    } catch { }
-}
-
-// Make sure the stored object is in Blue Marble's JSON format
-dataManager.toBlueMarbleSchema();
-if(dataManager.getType() !== "BM"){
-    dataManager.update(EMPTY_BLUE_MARBLE_JSON)
-}
-
-else if((dataManager.get() as TBlueMarbleJSON).links){
-    (dataManager.get() as TBlueMarbleJSON).links?.forEach(link => {
-        // Imports data from every URL in the stored object
-        importFromURL(link.url);
-    })
-}
-
-// Call the initialisation functions of all the windows
-initManageTemplates();
-initManageLinks();
-initCreateTemplate();
-initMainOverlay();
-
-/** Fetches data from a url and then updates the object stored in dataManager appropriately
- * @since 0.1.0-overhaul
- */
-function importFromURL(url: string){
+const mainOverlay = document.querySelector("#bm-main-overlay");
+// If main overlay already exists that means another Blue Marble instance is already running
+if(!mainOverlay){ 
     
-    const data = EMPTY_BLUE_MARBLE_JSON; // data should be the data fetched from the URL
+    // Only run the code if this is the first Blue Marble instance
+    const params = new URLSearchParams(document.location.search); // Gets the url search query
+    if (params.has("bmShare")) {
+        try {
+            const json = JSON.parse(params.get("bmShare")!)
+            dataManager.appendData(json)
+        } catch { }
+    }
 
-    dataManager.appendTemplateDataFromURL(data, url);
+    // Make sure the stored object is in Blue Marble's JSON format
+    dataManager.toBlueMarbleSchema();
+    if(dataManager.getType() !== "BM"){
+        dataManager.update(EMPTY_BLUE_MARBLE_JSON)
+    }
+
+    else if((dataManager.get() as TBlueMarbleJSON).links){
+        (dataManager.get() as TBlueMarbleJSON).links?.forEach(link => {
+            // Imports data from every URL in the stored object
+            importFromURL(link.url);
+        })
+    }
+
+    // Call the initialisation functions of all the windows
+    initManageTemplates();
+    initManageLinks();
+    initCreateTemplate();
+    initMainOverlay();
+
+    /** Fetches data from a url and then updates the object stored in dataManager appropriately
+     * @since 0.1.0-overhaul
+     */
+    function importFromURL(url: string){
+        
+        const data = EMPTY_BLUE_MARBLE_JSON; // data should be the data fetched from the URL
+
+        dataManager.appendTemplateDataFromURL(data, url);
+    }
 }
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