From 8e2172afd398d7650cdbb46ba06e233ad65b00b9 Mon Sep 17 00:00:00 2001
From: Smidy13 <77650800+Smidy13@users.noreply.github.com>
Date: Tue, 6 Apr 2021 14:40:00 +1200
Subject: [PATCH] Browser User Agent Check + Warning

---
 UI/AppPreLoader.js | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/UI/AppPreLoader.js b/UI/AppPreLoader.js
index 2fb263427..ba6255917 100644
--- a/UI/AppPreLoader.js
+++ b/UI/AppPreLoader.js
@@ -40,11 +40,35 @@ function loadSuperalgos() {
     const MODULE_NAME = "App Pre-Loader";
     const INFO_LOG = false;
 
+    let browser = checkBrowserVersion();
     setupHTMLTextArea()
     setupHTMLInput()
     setupHTMLCanvas()
     loadDebugModule()
 
+    if ((browser.name !== "Chrome" && browser.name!=="Safari") || (browser.name === "Chrome" && parseInt(browser.version) < 85) || (browser.name === "Safari" && parseInt(browser.version) < 13)) {
+        alert("Superalgos is officially supported on Google Chrome 85 or Safari 13.1 and above. Your browser version has been detected as potentially beneath this. If you continue you may experience some functionaility issues.\n\nDetected Browser: " + browser.name + "\nVersion: " + browser.version);
+    }
+
+    function checkBrowserVersion () {
+
+        let ua=navigator.userAgent,tem,M=ua.match(/(opera|chrome|safari|firefox|msie|trident(?=\/))\/?\s*(\d+)/i) || [];
+        if(/trident/i.test(M[1])){
+            tem=/\brv[ :]+(\d+)/g.exec(ua) || [];
+            return {name:'IE',version:(tem[1]||'')};
+        }
+        if(M[1]==='Chrome'){
+            tem=ua.match(/\bOPR|Edge\/(\d+)/)
+            if(tem!=null)   {return {name:'Opera', version:tem[1]};}
+        }
+        M=M[2]? [M[1], M[2]]: [navigator.appName, navigator.appVersion, '-?'];
+        if((tem=ua.match(/version\/(\d+)/i))!=null) {M.splice(1,1,tem[1]);}
+        return {
+            name: M[0],
+            version: M[1]
+        };
+    }
+
     function setupHTMLTextArea() {
         let textArea = document.createElement('textarea');
         textArea.id = "textArea";