Moved method to new helper.

app/Helpers/Report/AccountReportHelperInterface.php

@@ -9,6 +9,11 @@
 
 namespace FireflyIII\Helpers\Report;
 
+use Carbon\Carbon;
+use FireflyIII\Helpers\Collection\Account as AccountCollection;
+use Illuminate\Support\Collection;
+
+
 /**
  * Interface AccountReportHelperInterface
  *
@@ -16,5 +21,16 @@ namespace FireflyIII\Helpers\Report;
  */
 interface AccountReportHelperInterface
 {
+    /**
+     * This method generates a full report for the given period on all
+     * given accounts
+     *
+     * @param Carbon     $start
+     * @param Carbon     $end
+     * @param Collection $accounts
+     *
+     * @return AccountCollection
+     */
+    public function getAccountReport(Carbon $start, Carbon $end, Collection $accounts);
 
 }