Problem with building radiobutton settings

So, I’ve been developing this theme I build as my thesis last year and I want to do radiobuttons so user can choose the sidebar location and theme color. The problem is that for some reason my settings doesn’t seem to be saving the sidebar option at all. The selected option doesn’t appear as checked after hitting Save -button. Can somebody look my code and tell me what I’m doing wrong here? All I want right now is just a simple Left or Right question to work.

<?php
class NatureLightOptions
{

private $options;

public function __construct(){
	add_action( 'admin_menu', array( $this, 'nature_light_register_submenu_page' ) );
        add_action( 'admin_init', array( $this, 'nature_light_register_settings' ) );
}

public function nature_light_register_submenu_page() {
	// Add theme options page to the admin menu
        add_theme_page(
            __('Theme Options', "nature-light"),
            __('Theme Options', "nature-light"),
            'manage_options',
            'nature_light_options',
            array( $this, 'nature_light_options_page' )
        );
}

public function nature_light_register_settings() {
	// Register settings and call sanitation functions
        register_setting(
            'nature_light_options_group', // Option group
            'nature_light_options', // Option name
            array( $this, 'nature_light_validate' ) // Sanitize
        );

        add_settings_section(
            'nature_light_setting_section', // ID
            'Theme Options', // Title
            array( $this, 'print_nature_light_info' ), // Callback
            'nature_light_options_page' // Page
        );  

        add_settings_field(
            'theme_color', // ID
            'Theme Color', // Title
            array( $this, 'theme_color_callback' ), // Callback
            'nature_light_options_page', // Page
            'nature_light_setting_section' // Section
        );      

        add_settings_field(
            'sidebar_location',
            'Sidebar location',
            array( $this, 'sidebar_location_callback' ),
            'nature_light_options_page',
            'nature_light_setting_section'
        );

        add_settings_field(
            'footer_text',
            'Footer text',
            array( $this, 'footer_text_callback' ),
            'nature_light_options_page',
            'nature_light_setting_section'
        );
} 

public function nature_light_options_page(){
	// Set class property
        $this->options = get_option( 'nature_light_options' ); ?>
        <div class="wrap">

            <h2>Theme Options</h2>
            <form method="post" action="options.php">
            <?php
		submit_button();
                // This prints out all hidden setting fields
                settings_fields( 'nature_light_options_group' );
                do_settings_sections( 'nature_light_options_page' );
                submit_button();
            ?>
            </form>

        </div><!--.wrap-->
<?php
}

public function nature_light_validate($input){
        // Create our array for storing the validated options
	$new_input = array();

        if(isset($input['footer_text']))
            $new_input['footer_text'] = sanitize_text_field( $input['footer_text'] );

	// Loop through each of the incoming options
	foreach($input as $key => $value){

		// Check to see if the current option has a value. If so, process it.
		if(isset($input[$key])){

			// Strip all HTML and PHP tags and properly handle quoted strings
			$new_input[$key] = strip_tags(stripslashes($input[$key]));

		} // end if
	} // end foreach

	// Return the array processing any additional functions filtered by this action
	return apply_filters('nature_light_validate', $new_input, $input);
}

public function print_nature_light_info(){
	print __('Enter your settings below:', "nature-light");
}

public function sidebar_location_callback(){
	$options = get_option('nature_light_options_page');

	printf('<input type="radio" id="sidebarlocation" name="sidebar[location]" value="1"' . checked(1, $options['sidebar_location'], false) . '/> <label>Right</label>
	<input type="radio" id="sidebarlocation" name="sidebar[location]" value="2"' . checked(2, $options['sidebar_location'], false) . '/> <label>Left</label>' );

}

public function footer_text_callback(){
	printf(
	'<input type="text" id="footer_text" name="nature_light_options[footer_text]" value="%s" />',
	isset( $this->options['footer_text'] ) ? esc_attr( $this->options['footer_text']) : ''
        );
}

public function theme_color_callback(){

}

} //end of class

if( is_admin() )
    $nature_light_options = new NatureLightOptions();
?>