From 782260019e3e7107d9837d9d4ff7b40663ac4841 Mon Sep 17 00:00:00 2001
From: "Igor A. Melekhine" <igor.melekhine@me.com>
Date: Tue, 8 Aug 2023 11:18:47 +0300
Subject: [PATCH] appver

---
 request.go      |  2 +-
 version.go      | 17 ++++++++++++++++-
 version_test.go | 22 ++++++++++++++++++++++
 3 files changed, 39 insertions(+), 2 deletions(-)
 create mode 100644 version_test.go

diff --git a/request.go b/request.go
index 50552b0..25cf257 100644
--- a/request.go
+++ b/request.go
@@ -36,7 +36,7 @@ func init() {
 // newRequest creates new http request to RSP.
 func newRequest(ctx context.Context, method, link, apiToken string, payload []byte) (*http.Request, error) {
 	req, err := http.NewRequestWithContext(ctx, method, link, bytes.NewBuffer(payload))
-	req.Header.Set("User-Agent", userAgent+"/"+Version)
+	req.Header.Set("User-Agent", version())
 	req.Header.Set("Content-Type", "application/json")
 	req.Header.Set("Accept", "application/json")
 	req.Header.Set("Authorization", "Bearer "+apiToken)
diff --git a/version.go b/version.go
index f53dfe4..3157cf7 100644
--- a/version.go
+++ b/version.go
@@ -1,7 +1,22 @@
 package qiwi
 
+import "fmt"
+
+// AppVersion for version string of main application version
+var AppVersion string
+
 const (
 	// Version string.
-	Version   string = "0.3"
+	Version   string = "1.0.0"
 	userAgent string = "Sendtips-QIWI-Go" // UserAgent name
 )
+
+func version() (s string) {
+	s = fmt.Sprintf("%s/%s", userAgent, Version)
+	
+	if AppVersion != "" {
+		s = fmt.Sprintf("%s (%s)", AppVersion, s)
+	}
+	
+	return s
+}
diff --git a/version_test.go b/version_test.go
new file mode 100644
index 0000000..d041b5f
--- /dev/null
+++ b/version_test.go
@@ -0,0 +1,22 @@
+package qiwi
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestVersion(t *testing.T) {
+	s := fmt.Sprintf("%s/%s", userAgent, Version)
+	
+	if s != version() {
+		t.Error("Version string is invalid")
+	}
+	
+	AppVersion = "somever/1.0"
+	s = fmt.Sprintf("%s (%s/%s)", AppVersion, userAgent, Version)
+	
+	if s != version() {
+		t.Error("Version string is invalid")
+	}
+
+}