<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Event_concurrent_process_model extends CI_Model {

	public function __construct() {
        parent::__construct();
    }

    public function lock_or_add_process($user_id, $login_id, $process_type, $event_id){
        // Check if process_exist for non paid event
        if ($this->input->post('event_category') && $this->input->post('event_category') != 'PAID_EVENT') {
            if($this->check_process($user_id, $process_type, $event_id) > 0){
                return array("status"=>false);
            } else {
                return $this->add_process($user_id, $login_id, $process_type, $event_id);
            }
        }
        return array("status"=> true);
    }

    public function add_process($user_id, $login_id, $process_type, $event_id){
    	$this->db->query("INSERT INTO
        event_concurrent_process(login_id, process_reference, process_type, process_expiration, process_status)
        VALUES(?, ?, ?, NOW(), 1)", array(
        	$login_id,
        	$event_id,
        	$process_type));
    	return array("status"=>true, "process_id" => $this->db->insert_id());
    }

    public function update_process($user_id, $login_id, $event_id, $process_type, $process_id){
        $this->db->query("UPDATE event_concurrent_process
            SET process_expiration = NOW()
            WHERE process_type = ?
            AND process_reference = ?
            AND login_id = ?
            AND process_id = ?
            AND process_status = 1",array(
            $process_type,
            $event_id,
            $login_id,
            $process_id));
        return $this->db->affected_rows();
    }

    public function ma_update_process($update_process){
        if($update_process) {
            foreach($update_process as $value){
                 $this->db->query("UPDATE event_concurrent_process
                    SET process_expiration = NOW()
                    WHERE process_type = ?
                    AND login_id = ?
                    AND process_id = ?
                    AND process_status = 1",array(
                    $value['process_type'],
                    $value['login_id'],
                    $value['process_id']));
            }
        }
        return true;
    }

    public function check_process_id_validity($login_id, $process_id, $process_type, $event_id){
        $this->db->select("process_id");
        $this->db->from("event_concurrent_process");
        $this->db->where("process_reference", $event_id);
        $this->db->where("login_id", $login_id);
        $this->db->where("process_id", $process_id);
        $this->db->where("process_type", $process_type);
        $this->db->where("process_status", 1);
        $this->db->order_by("process_id", "desc");
        $this->db->limit(1);
        return $this->db->get()->num_rows();
    }

    private function check_process($user_id, $process_type, $event_id){
    	$this->db->select("ecp.process_id");
    	$this->db->from("event_concurrent_process ecp");
    	$this->db->join("user_login_history ulh", "ulh.history_id = ecp.login_id", "left");
    	$this->db->where("process_reference", $event_id);
    	$this->db->where("process_type", $process_type);
    	$this->db->where("ulh.user_id", $user_id);
    	$this->db->where("ecp.process_status", 1);
    	$this->db->order_by("ecp.process_id", "desc");
    	$this->db->limit(1);
    	return $this->db->get()->num_rows();
    }


    private function _query_activity($user_id,$login_id,$process_type, $event_id=null){

    	$where = ($event_id!=null)?" AND (ecp.login_id != '".$this->db->escape_str($login_id)."') AND ecp.process_reference='".$this->db->escape_str($event_id)."'"
        :"AND (ecp.login_id != '".$this->db->escape_str($login_id)."' OR ecp.login_id = '".$this->db->escape_str($login_id)."')";

    	return "SELECT ecp.*, ulh.user_id, ulh.status
	    	FROM event_concurrent_process ecp
	    	LEFT JOIN user_login_history ulh
	    	ON  ulh.history_id = ecp.login_id
	    	WHERE ulh.user_id = '".$this->db->escape_str($user_id)."'
	        AND ecp.process_status = 1
	    	AND ecp.process_type = '".$this->db->escape_str($process_type)."'
	    	".$where;
    }

 	/*Check if has activity */

    public function has_activity( $user_id, $login_id ,$process_type, $event_id=null){
        // Check if process_exist for non paid event
        if ($this->input->post('event_category') && $this->input->post('event_category') != 'PAID_EVENT') {
            $record = $this->db->query($this->_query_activity($user_id, $login_id, $process_type, $event_id));
            return $record->num_rows() >  0;
        }
        return false;
    }
    /*End of check if has activity */

    public function unlock_action($user_id, $login_id, $event_id, $process_type){
    	$this->db->where('login_id', $login_id)
    		->where('process_reference', $event_id)
        	->where('process_type', $process_type)
            ->where('process_status',1)
        	->update('event_concurrent_process', array('process_status' => 0));
        	return true;
    }

    public function unlock_action_by_process_id($login_id, $process_type, $process_id){
        $this->db->where('login_id', $login_id)
            ->where('process_id', $process_id)
            ->where('process_type', $process_type)
            ->where('process_status',1)
            ->update('event_concurrent_process', array('process_status' => 0));
            return true;
    }

    public function unlock_all_action($update_process){
        if(countVal($update_process) > 0) {
            $this->db->trans_start();
            $this->db->update_batch('event_concurrent_process', $update_process, 'process_id');
            $this->db->trans_complete();
            return ($this->db->trans_status() === FALSE)? FALSE:TRUE;
        }else {
            return true;
        }
    }

    public function cron_unlock_fo_actions(){
        //then, unlock process status
        $this->db->query("UPDATE event_concurrent_process
            SET process_status = 0
            WHERE timestampdiff(MINUTE, process_expiration, NOW()) > 2
            AND process_status = 1");
        $updated_rows = $this->db->affected_rows();
        if($updated_rows > 0){
            return $updated_rows;
        }
        return false;
    }

    public function check_process_exists($process_id, $login_id, $event_id) {
        $this->db->select("*");
    	$this->db->from("event_concurrent_process");
    	$this->db->where("process_reference", $event_id);
    	$this->db->where("process_id", $process_id);
    	$this->db->where("login_id", $login_id);
    	if($this->db->get()->num_rows()>0) {
            return true;
        }
        return false;
    }
}