From ea55a8fdf478a29a26d6e16ee712d8091d99b00f Mon Sep 17 00:00:00 2001
From: Pabloader <pabloader@pabloader.ru>
Date: Sat, 11 Apr 2026 14:36:32 +0000
Subject: [PATCH] Format number function

---
 src/common/utils.ts       |  8 +++++++-
 test/common/utils.test.ts | 27 ++++++++++++++++++++++++++-
 2 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/src/common/utils.ts b/src/common/utils.ts
index f1a4d3a..5f0f907 100644
--- a/src/common/utils.ts
+++ b/src/common/utils.ts
@@ -112,11 +112,17 @@ export const callUpdater = <T>(f: StateUpdater<T>, prev: T) =>
     typeof f === 'function' ? (f as Function)(prev) : f;
 
 export const formatNumber = (n: number): string => {
+    if (n === 0) return '0';
+    if (n < 0) return `-${formatNumber(-n)}`;
     if (n >= 1_000_000_000_000) return `${(n / 1_000_000_000_000).toFixed(2)}T`;
     if (n >= 1_000_000_000) return `${(n / 1_000_000_000).toFixed(2)}B`;
     if (n >= 1_000_000) return `${(n / 1_000_000).toFixed(2)}M`;
     if (n >= 1_000) return `${(n / 1_000).toFixed(2)}k`;
-    return String(n);
+    if (Math.trunc(n) === n) return n.toString();
+    if (n >= 1) return n.toFixed(2);
+    const result = n.toPrecision(2);
+    if (parseFloat(result) >= 1) return parseFloat(result).toFixed(2);
+    return result;
 };
 
 export const formatTime = (seconds: number): string => {
diff --git a/test/common/utils.test.ts b/test/common/utils.test.ts
index b34c351..ec3ffdd 100644
--- a/test/common/utils.test.ts
+++ b/test/common/utils.test.ts
@@ -310,12 +310,27 @@ describe('utils', () => {
     });
 
     describe('formatNumber', () => {
-        it('should return small numbers as-is', () => {
+        it('should return small integer as-is', () => {
             expect(formatNumber(0)).toBe('0');
             expect(formatNumber(42)).toBe('42');
             expect(formatNumber(999)).toBe('999');
         });
 
+        it('should return small decimals rounded to at most 2 significant digits', () => {
+            expect(formatNumber(0.1)).toBe('0.10');
+            expect(formatNumber(0.123)).toBe('0.12');
+            expect(formatNumber(0.5)).toBe('0.50');
+            expect(formatNumber(0.999)).toBe('1.00');
+            expect(formatNumber(0.001)).toBe('0.0010');
+            expect(formatNumber(0.0001234)).toBe('0.00012');
+        });
+
+        it('should return decimals between 100 and 1000 with 2 decimal places', () => {
+            expect(formatNumber(100.5)).toBe('100.50');
+            expect(formatNumber(500.75)).toBe('500.75');
+            expect(formatNumber(999.9)).toBe('999.90');
+        });
+
         it('should format thousands with k suffix', () => {
             expect(formatNumber(1_000)).toBe('1.00k');
             expect(formatNumber(5_500)).toBe('5.50k');
@@ -338,6 +353,16 @@ describe('utils', () => {
             expect(formatNumber(1_000_000_000_000)).toBe('1.00T');
             expect(formatNumber(5_250_000_000_000)).toBe('5.25T');
         });
+
+        it('should format negative numbers with a leading minus sign', () => {
+            expect(formatNumber(-42)).toBe('-42');
+            expect(formatNumber(-0.123)).toBe('-0.12');
+            expect(formatNumber(-0.999)).toBe('-1.00');
+            expect(formatNumber(-1_000)).toBe('-1.00k');
+            expect(formatNumber(-1_000_000)).toBe('-1.00M');
+            expect(formatNumber(-1_000_000_000)).toBe('-1.00B');
+            expect(formatNumber(-1_000_000_000_000)).toBe('-1.00T');
+        });
     });
 
     describe('formatTime', () => {