From aaf4943fa37ad1b6f290ea88735444a54d6e1536 Mon Sep 17 00:00:00 2001
From: Panayiotis Lipiridis <lipiridis@gmail.com>
Date: Sun, 7 Feb 2021 15:51:12 +0200
Subject: [PATCH] Average speed

---
 src/networkStats.ts | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/networkStats.ts b/src/networkStats.ts
index b5f8869a1..ff1ea3093 100644
--- a/src/networkStats.ts
+++ b/src/networkStats.ts
@@ -1,5 +1,19 @@
 const IMAGE_URL = `${process.env.REACT_APP_SOCKET_SERVER_URL}/test256.png`;
 const IMAGE_SIZE_BITS = 141978 * 8;
+const AVERAGE_MAX = 4;
+
+const speedHistory: number[] = [];
+
+const pushSpeed = (speed: number): void => {
+  speedHistory.push(speed);
+  if (speedHistory.length > AVERAGE_MAX) {
+    speedHistory.shift();
+  }
+};
+
+const getAverageSpeed = (): number => {
+  return speedHistory.reduce((a, b) => a + b) / speedHistory.length;
+};
 
 const getSpeedBits = (
   imageSize: number,
@@ -20,7 +34,8 @@ const processImage = (): Promise<number> => {
     image.onload = () => {
       endTime = new Date().getTime();
       const speed = getSpeedBits(IMAGE_SIZE_BITS, startTime, endTime);
-      resolve(speed);
+      pushSpeed(speed);
+      resolve(getAverageSpeed());
     };
 
     image.onerror = () => {
@@ -31,6 +46,7 @@ const processImage = (): Promise<number> => {
     image.src = `${IMAGE_URL}?t=${startTime}`;
   });
 };
+
 export const getNetworkSpeed = async (): Promise<number> => {
   return await processImage();
 };