Track sessions count per analytics project

Each sessions count should be tracked per project for which it is started. Currently we were using the same counter for all sessions.
Fix this by using separate counter for each project.
Remove the old key ("SESSIONS_STARTED") and use it as current value for the new key (`SESSIONS_STARTED_<analytics_project_key>`) in case it existed.

Author: rosen-vladimirov

lib/common

@@ -3,6 +3,9 @@
 import { createGUID } from "../common/helpers";
 
 class AnalyticsSettingsService implements IAnalyticsSettingsService {
+	private static SESSIONS_STARTED_OBSOLETE_KEY = "SESSIONS_STARTED";
+	private static SESSIONS_STARTED_KEY_PREFIX = "SESSIONS_STARTED_";
+
 	constructor(private $userSettingsService: UserSettings.IUserSettingsService,
 		private $staticConfig: IStaticConfig,
 		private $logger: ILogger) { }
@@ -33,14 +36,23 @@ class AnalyticsSettingsService implements IAnalyticsSettingsService {
 		return "http://www.telerik.com/company/privacy-policy";
 	}
 
-	public getUserSessionsCount(): IFuture<number> {
+	public getUserSessionsCount(projectName: string): IFuture<number> {
 		return (() => {
-			return this.$userSettingsService.getSettingValue<number>("SESSIONS_STARTED").wait() || 0;
+			let oldSessionCount = this.$userSettingsService.getSettingValue<number>(AnalyticsSettingsService.SESSIONS_STARTED_OBSOLETE_KEY).wait();
+			if(oldSessionCount) {
+				// remove the old property for sessions count
+				this.$userSettingsService.removeSetting(AnalyticsSettingsService.SESSIONS_STARTED_OBSOLETE_KEY).wait();
+			}
+			return this.$userSettingsService.getSettingValue<number>(this.getSessionsProjectKey(projectName)).wait() || oldSessionCount || 0;
 		}).future<number>()();
 	}
 
-	public setUserSessionsCount(count: number): IFuture<void> {
-		return this.$userSettingsService.saveSetting<number>("SESSIONS_STARTED", count);
+	public setUserSessionsCount(count: number, projectName: string): IFuture<void> {
+		return this.$userSettingsService.saveSetting<number>(this.getSessionsProjectKey(projectName), count);
+	}
+
+	private getSessionsProjectKey(projectName: string): string {
+		return `${AnalyticsSettingsService.SESSIONS_STARTED_KEY_PREFIX}${projectName}`;
 	}
 }
 $injector.register("analyticsSettingsService", AnalyticsSettingsService);