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<?php
class Appconfig extends CI_Model 
{
    public function exists($key)
    {
        $this->db->from('app_config');  
        $this->db->where('app_config.key', $key);

        return ($this->db->get()->num_rows() == 1);
    }
    
    public function get_all()
    {
        $this->db->from('app_config');
        $this->db->order_by('key', 'asc');

        return $this->db->get();        
    }
    
    public function get($key)
    {
        $query = $this->db->get_where('app_config', array('key' => $key), 1);

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

        return '';
    }
    
    public function save($key, $value)
    {
        $config_data = array(
            'key'   => $key,
            'value' => $value
        );

        if(!$this->exists($key))
        {
            return $this->db->insert('app_config', $config_data);
        }

        $this->db->where('key', $key);

        return $this->db->update('app_config', $config_data);
    }
    
    public function batch_save($data)
    {
        $success = TRUE;
        
        //Run these queries as a transaction, we want to make sure we do all or nothing
        $this->db->trans_start();

        foreach($data as $key=>$value)
        {
            $success &= $this->save($key, $value);
        }

        $this->db->trans_complete();

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

        return $success;
    }
        
    public function delete($key)
    {
        return $this->db->delete('app_config', array('key' => $key)); 
    }
    
    public function delete_all()
    {
        return $this->db->empty_table('app_config'); 
    }

    public function acquire_save_next_invoice_sequence()
    {
        $last_used = $this->get('last_used_invoice_number') + 1;
        $this->save('last_used_invoice_number', $last_used);
        return $last_used;
    }

    public function acquire_save_next_quote_sequence()
    {
        $last_used = $this->get('last_used_quote_number') + 1;
        $this->save('last_used_quote_number', $last_used);
        return $last_used;
    }
}
?>