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

/**
 * Employee class
 *
 * @link    github.com/jekkos/opensourcepos
 * @since   1.0
 * @author  N/A
 */

class Employee extends Person
{
    /*
    Determines if a given person_id is an employee
    */
    public function exists($person_id)
    {
        $this->db->from('employees');   
        $this->db->join('people', 'people.person_id = employees.person_id');
        $this->db->where('employees.person_id', $person_id);

        return ($this->db->get()->num_rows() == 1);
    }   

    /*
    Gets total of rows
    */
    public function get_total_rows()
    {
        $this->db->from('employees');
        $this->db->where('deleted', 0);

        return $this->db->count_all_results();
    }

    /*
    Returns all the employees
    */
    public function get_all($limit = 10000, $offset = 0)
    {
        $this->db->from('employees');
        $this->db->where('deleted', 0);     
        $this->db->join('people', 'employees.person_id = people.person_id');            
        $this->db->order_by('last_name', 'asc');
        $this->db->limit($limit);
        $this->db->offset($offset);

        return $this->db->get();        
    }
    
    /*
    Gets information about a particular employee
    */
    public function get_info($employee_id)
    {
        $this->db->from('employees');   
        $this->db->join('people', 'people.person_id = employees.person_id');
        $this->db->where('employees.person_id', $employee_id);
        $query = $this->db->get();

        if($query->num_rows() == 1)
        {
            return $query->row();
        }
        else
        {
            //Get empty base parent object, as $employee_id is NOT an employee
            $person_obj = parent::get_info(-1);

            //Get all the fields from employee table
            //append those fields to base parent object, we we have a complete empty object
            foreach($this->db->list_fields('employees') as $field)
            {
                $person_obj->$field = '';
            }

            return $person_obj;
        }
    }

    /*
    Gets information about multiple employees
    */
    public function get_multiple_info($employee_ids)
    {
        $this->db->from('employees');
        $this->db->join('people', 'people.person_id = employees.person_id');        
        $this->db->where_in('employees.person_id', $employee_ids);
        $this->db->order_by('last_name', 'asc');

        return $this->db->get();        
    }

    /*
    Inserts or updates an employee
    */
    public function save_employee(&$person_data, &$employee_data, &$grants_data, $employee_id = FALSE)
    {
        $success = FALSE;

        //Run these queries as a transaction, we want to make sure we do all or nothing
        $this->db->trans_start();

        if(parent::save($person_data, $employee_id))
        {
            if(!$employee_id || !$this->exists($employee_id))
            {
                $employee_data['person_id'] = $employee_id = $person_data['person_id'];
                $success = $this->db->insert('employees', $employee_data);
            }
            else
            {
                $this->db->where('person_id', $employee_id);
                $success = $this->db->update('employees', $employee_data);
            }

            //We have either inserted or updated a new employee, now lets set permissions. 
            if($success)
            {
                //First lets clear out any grants the employee currently has.
                $success = $this->db->delete('grants', array('person_id' => $employee_id));
                
                //Now insert the new grants
                if($success)
                {
                    foreach($grants_data as $permission_id)
                    {
                        $success = $this->db->insert('grants', array('permission_id' => $permission_id, 'person_id' => $employee_id));
                    }
                }
            }
        }

        $this->db->trans_complete();

        $success &= $this->db->trans_status();

        return $success;
    }

    /*
    Deletes one employee
    */
    public function delete($employee_id)
    {
        $success = FALSE;

        //Don't let employees delete theirself
        if($employee_id == $this->get_logged_in_employee_info()->person_id)
        {
            return FALSE;
        }

        //Run these queries as a transaction, we want to make sure we do all or nothing
        $this->db->trans_start();

        //Delete permissions
        if($this->db->delete('grants', array('person_id' => $employee_id)))
        {   
            $this->db->where('person_id', $employee_id);
            $success = $this->db->update('employees', array('deleted' => 1));
        }

        $this->db->trans_complete();

        return $success;
    }

    /*
    Deletes a list of employees
    */
    public function delete_list($employee_ids)
    {
        $success = FALSE;

        //Don't let employees delete theirself
        if(in_array($this->get_logged_in_employee_info()->person_id, $employee_ids))
        {
            return FALSE;
        }

        //Run these queries as a transaction, we want to make sure we do all or nothing
        $this->db->trans_start();

        $this->db->where_in('person_id', $employee_ids);
        //Delete permissions
        if($this->db->delete('grants'))
        {
            //delete from employee table
            $this->db->where_in('person_id', $employee_ids);
            $success = $this->db->update('employees', array('deleted' => 1));
        }

        $this->db->trans_complete();

        return $success;
    }

    /*
    Get search suggestions to find employees
    */
    public function get_search_suggestions($search, $limit = 5)
    {
        $suggestions = array();

        $this->db->from('employees');
        $this->db->join('people', 'employees.person_id = people.person_id');
        $this->db->group_start();
            $this->db->like('first_name', $search);
            $this->db->or_like('last_name', $search); 
            $this->db->or_like('CONCAT(first_name, " ", last_name)', $search);
        $this->db->group_end();
        $this->db->where('deleted', 0);
        $this->db->order_by('last_name', 'asc');
        foreach($this->db->get()->result() as $row)
        {
            $suggestions[] = array('value' => $row->person_id, 'label' => $row->first_name.' '.$row->last_name);
        }

        $this->db->from('employees');
        $this->db->join('people', 'employees.person_id = people.person_id');
        $this->db->where('deleted', 0);
        $this->db->like('email', $search);
        $this->db->order_by('email', 'asc');
        foreach($this->db->get()->result() as $row)
        {
            $suggestions[] = array('value' => $row->person_id, 'label' => $row->email);
        }

        $this->db->from('employees');
        $this->db->join('people', 'employees.person_id = people.person_id');
        $this->db->where('deleted', 0);
        $this->db->like('username', $search);
        $this->db->order_by('username', 'asc');
        foreach($this->db->get()->result() as $row)
        {
            $suggestions[] = array('value' => $row->person_id, 'label' => $row->username);
        }

        $this->db->from('employees');
        $this->db->join('people', 'employees.person_id = people.person_id');
        $this->db->where('deleted', 0);
        $this->db->like('phone_number', $search);
        $this->db->order_by('phone_number', 'asc');
        foreach($this->db->get()->result() as $row)
        {
            $suggestions[] = array('value' => $row->person_id, 'label' => $row->phone_number);
        }

        //only return $limit suggestions
        if(count($suggestions > $limit))
        {
            $suggestions = array_slice($suggestions, 0, $limit);
        }

        return $suggestions;
    }

    /*
    Gets rows
    */
    public function get_found_rows($search)
    {
        $this->db->from('employees');
        $this->db->join('people', 'employees.person_id = people.person_id');
        $this->db->group_start();
            $this->db->like('first_name', $search);
            $this->db->or_like('last_name', $search);
            $this->db->or_like('email', $search);
            $this->db->or_like('phone_number', $search);
            $this->db->or_like('username', $search);
            $this->db->or_like('CONCAT(first_name, " ", last_name)', $search);
        $this->db->group_end();
        $this->db->where('deleted', 0);

        return $this->db->get()->num_rows();
    }

    /*
    Performs a search on employees
    */
    public function search($search, $rows = 0, $limit_from = 0, $sort = 'last_name', $order = 'asc')
    {
        $this->db->from('employees');
        $this->db->join('people', 'employees.person_id = people.person_id');
        $this->db->group_start();
            $this->db->like('first_name', $search);
            $this->db->or_like('last_name', $search);
            $this->db->or_like('email', $search);
            $this->db->or_like('phone_number', $search);
            $this->db->or_like('username', $search);
            $this->db->or_like('CONCAT(first_name, " ", last_name)', $search);
        $this->db->group_end();
        $this->db->where('deleted', 0);
        $this->db->order_by($sort, $order);

        if($rows > 0)
        {
            $this->db->limit($rows, $limit_from);
        }

        return $this->db->get();    
    }

    /*
    Attempts to login employee and set session. Returns boolean based on outcome.
    */
    public function login($username, $password)
    {
        $query = $this->db->get_where('employees', array('username' => $username, 'deleted' => 0), 1);

        if($query->num_rows() == 1)
        {
            $row = $query->row();

            // compare passwords depending on the hash version
            if($row->hash_version == 1 && $row->password == md5($password))
            {
                $this->db->where('person_id', $row->person_id);
                $this->session->set_userdata('person_id', $row->person_id);
                $password_hash = password_hash($password, PASSWORD_DEFAULT);

                return $this->db->update('employees', array('hash_version' => 2, 'password' => $password_hash));
            }
            elseif($row->hash_version == 2 && password_verify($password, $row->password))
            {
                $this->session->set_userdata('person_id', $row->person_id);

                return TRUE;
            }

        }

        return FALSE;
    }

    /*
    Logs out a user by destorying all session data and redirect to login
    */
    public function logout()
    {
        $this->session->sess_destroy();

        redirect('login');
    }
    
    /*
    Determins if a employee is logged in
    */
    public function is_logged_in()
    {
        return ($this->session->userdata('person_id') != FALSE);
    }

    /*
    Gets information about the currently logged in employee.
    */
    public function get_logged_in_employee_info()
    {
        if($this->is_logged_in())
        {
            return $this->get_info($this->session->userdata('person_id'));
        }

        return FALSE;
    }

    /*
    Determines whether the employee has access to at least one submodule
     */
    public function has_module_grant($permission_id, $person_id)
    {
        $this->db->from('grants');
        $this->db->like('permission_id', $permission_id, 'after');
        $this->db->where('person_id', $person_id);
        $result_count = $this->db->get()->num_rows();

        if($result_count != 1)
        {
            return ($result_count != 0);
        }

        return $this->has_subpermissions($permission_id);
    }

    /*
    Checks permissions
    */
    public function has_subpermissions($permission_id)
    {
        $this->db->from('permissions');
        $this->db->like('permission_id', $permission_id.'_', 'after');

        return ($this->db->get()->num_rows() == 0);
    }

    /*
    Determines whether the employee specified employee has access the specific module.
    */
    public function has_grant($permission_id, $person_id)
    {
        //if no module_id is null, allow access
        if($permission_id == NULL)
        {
            return TRUE;
        }

        $query = $this->db->get_where('grants', array('person_id' => $person_id, 'permission_id' => $permission_id), 1);

        return ($query->num_rows() == 1); 
    }

    /*
    Gets employee permission grants
    */
    public function get_employee_grants($person_id)
    {
        $this->db->from('grants');
        $this->db->where('person_id', $person_id);

        return $this->db->get()->result_array();
    }


    /*
    Attempts to login employee and set session. Returns boolean based on outcome.
    */
    public function check_password($username, $password)
    {
        $query = $this->db->get_where('employees', array('username' => $username, 'deleted' => 0), 1);

        if($query->num_rows() == 1)
        {
            $row = $query->row();

            // compare passwords
            if(password_verify($password, $row->password))
            {
                return TRUE;
            }

        }

        return FALSE;
    }

    /*
    Change password for the employee
    */
    public function change_password($employee_data, $employee_id = FALSE)
    {
        $success = FALSE;

        //Run these queries as a transaction, we want to make sure we do all or nothing
        $this->db->trans_start();

        $this->db->where('person_id', $employee_id);
        $success = $this->db->update('employees', $employee_data);

        $this->db->trans_complete();

        $success &= $this->db->trans_status();

        return $success;
    }
}
?>