public function executeAction($parameters)
 {
     $user = $this->_websoccer->getUser();
     $clubId = $user->getClubId($this->_websoccer, $this->_db);
     // check if it is own player
     $player = PlayersDataService::getPlayerById($this->_websoccer, $this->_db, $parameters["id"]);
     if ($clubId != $player["team_id"]) {
         throw new Exception("nice try");
     }
     // if player is not happy at club, he does not want to extend at all
     $satisfaction = $player["player_strength_satisfaction"];
     if ($satisfaction < MINIMUM_SATISFACTION_FOR_EXTENSION) {
         throw new Exception($this->_i18n->getMessage("extend-contract_player_is_unhappy"));
     }
     // check if player is already on market
     if ($player["player_transfermarket"]) {
         throw new Exception($this->_i18n->getMessage("sell_player_already_on_list"));
     }
     // no salary decrease
     if ($parameters["salary"] < $player["player_contract_salary"]) {
         throw new Exception($this->_i18n->getMessage("extend-contract_lower_than_current_salary"));
     }
     $averageSalary = $this->getAverageSalary($player["player_strength"]);
     // if salary is already higher than average, then just expect 10% more
     if ($player["player_contract_salary"] > $averageSalary) {
         $salaryFactor = 1.1;
     } else {
         // make minimum salary dependent on happiness
         $salaryFactor = (200 - $satisfaction) / 100;
     }
     $salaryFactor = max(1.1, $salaryFactor);
     $minSalary = round($player["player_contract_salary"] * $salaryFactor);
     // the salary should be at least 90% of the average, except if this would douple the salary
     if ($averageSalary < $parameters["salary"] * 2) {
         $minSalaryOfAverage = round(0.9 * $averageSalary);
         $minSalary = max($minSalary, $minSalaryOfAverage);
     }
     if ($parameters["salary"] < $minSalary) {
         // decrease satisfaction
         $this->decreaseSatisfaction($player["player_id"], $player["player_strength_satisfaction"]);
         throw new Exception($this->_i18n->getMessage("extend-contract_salary_too_low"));
     }
     // check if club can pay this salary
     TeamsDataService::validateWhetherTeamHasEnoughBudgetForSalaryBid($this->_websoccer, $this->_db, $this->_i18n, $clubId, $parameters["salary"]);
     // check goal bonus
     $minGoalBonus = $player["player_contract_goalbonus"] * 1.3;
     if ($parameters["goal_bonus"] < $minGoalBonus) {
         throw new Exception($this->_i18n->getMessage("extend-contract_goalbonus_too_low"));
     }
     $this->updatePlayer($player["player_id"], $player["player_strength_satisfaction"], $parameters["salary"], $parameters["goal_bonus"], $parameters["matches"]);
     // reset inactivity
     UserInactivityDataService::resetContractExtensionField($this->_websoccer, $this->_db, $user->id);
     // success message
     $this->_websoccer->addFrontMessage(new FrontMessage(MESSAGE_TYPE_SUCCESS, $this->_i18n->getMessage("extend-contract_success"), ""));
     return null;
 }