Fixed settle-method in Plugin.php

Plugin.php

         $this->show_template( 'GrantUser', $params );
     }
 
-    public function settle_view( string $url ) {
-        $m = array_key_exists( 'month', $_GET ) ? $_GET[ 'month' ] : date( 'm' ) - 1;
-        $y = array_key_exists( 'month', $_GET ) ? $_GET[ 'month' ] : date( 'Y' );
-        if ( $m == '0' ) { $m = '12'; $y--; }
-
+    private function settle( $m, $y ) {
         $mp = MinecraftMonthPaid::GetByUnique( 0, $m ,$y );
         if ( $mp ) {
             echo __( [ 'de' => 'Bereits abgerechnet', 'en' => 'Already settled' ] );
         }
     }
 
+    public function settle_view( string $url ) {
+        //  ORDER BY Year DESC, Month DESC LIMIT 1
+
+        $nwst = MinecraftMonthPaid::GetAll( "1 ORDER BY Year DESC, Month DESC LIMIT 1" )[ 0 ];
+    	if ( !$nwst ) {
+        	$nwst = new MinecraftMonthPaid();
+        	$nwst->SetMonth( date( 'm' ) );
+        	$nwst->SetYear( date( 'Y' ) );
+        }
+
+        $m = array_key_exists( 'month', $_GET ) ? $_GET[ 'month' ] + 1 : date( 'm' );
+        $y = array_key_exists( 'year', $_GET ) ? $_GET[ 'year' ] : date( 'Y' );
+        if ( $m == '0' ) { $m = '12'; $y--; }
+
+        $start    = ( new DateTime( $nwst->GetYear() . '-' . $nwst->GetMonth() . '-' . '01' ) )->modify( 'first day of next month' );
+        $end      = ( new DateTime( date( "$y-$m-01" ) ) )->modify( 'first day of this month' );
+        $interval = DateInterval::createFromDateString( '1 month' );
+        $period   = new DatePeriod( $start, $interval, $end );
+
+        $settled = false;
+        foreach ($period as $dt) {
+            $settled = true;
+            echo 'Settling ' . $dt->format("Y-m") . ': ';
+            $this->settle( $dt->format( 'm' ), $dt->format( 'Y' ) );
+            echo "<br>\n";
+        }
+
+        if( !$settled ) {
+            echo 'Nothing to settle';
+        }
+    }
+
     public function acredit_view( string $url ) {
         if ( !Permission::PERMITTED( 'Minecraft-Pay-Settings', 1 ) ) return;
         $params = null;