n $input;
    }
    
    // render email to customer message (approve)
    public function render_email_customer_approve_message()
    {
        $value = get_option( 'wbk_email_customer_approve_message', '<p>Your appointment bookin on #appointment_day at #appointment_time has been approved.</p>' );
        $args = array(
            'media_buttons' => false,
            'editor_height' => 300,
        );
        echo  '<a class="button wbk_email_editor_toggle">' . __( 'Toggle editor', 'wbk' ) . '</a><div class="wbk_email_editor_wrap" style="display:none;">' ;
        wp_editor( $value, 'wbk_email_customer_approve_message', $args );
        echo  '</div>' ;
    }
    
    // validate email to customer message (approve)
    public function validate_email_customer_approve_message( $input )
    {
        return $input;
    }
    
    // render customer email subject (on booking)
    public function render_email_customer_book_subject()
    {
        $value = get_option( 'wbk_email_customer_book_subject' );
        $value = sanitize_text_field( $value );
        $html = '<input type="text" id="wbk_email_customer_book_subject" name="wbk_email_customer_book_subject" value="' . $value . '" >';
        $html .= '<p class="description"><a rel="noopener" target="_blank" href="https://webba-booking.com/documentation/placeholders/">' . __( 'List of available placeholders', 'wbk' ) . '</a></p>';
        echo  $html ;
    }
    
    // validate email to customer message (on booking)
    public function validate_email_customer_book_subject( $input )
    {
        $input = sanitize_text_field( $input );
        return $input;
    }
    
    public function render_email_customer_manual_book_subject()
    {
        $value = get_option( 'wbk_email_customer_manual_book_subject' );
        $value = sanitize_text_field( $value );
        $html = '<input type="text" id="wbk_email_customer_manual_book_subject" name="wbk_email_customer_manual_book_subject" value="' . $value . '" >';
        $html .= '<p class="description"><a rel="noopener" target="_blank" href="https://webba-booking.com/documentation/placeholders/">' . __( 'List of available placeholders', 'wbk' ) . '</a></p>';
        echo  $html ;
    }
    
    // validate email to customer message (on booking)
    public function validate_email_customer_manual_book_subject( $input )
    {
        $input = sanitize_text_field( $input );
        return $input;
    }
    
    // render customer email subject (on approve)
    public function render_email_customer_approve_subject()
    {
        $value = get_option( 'wbk_email_customer_approve_subject', __( 'Your booking has been approved', 'wbk' ) );
        $value = sanitize_text_field( $value );
        $html = '<input type="text" id="wbk_email_customer_approve_subject" name="wbk_email_customer_approve_subject" value="' . $value . '" >';
        $html .= '<p class="description"><a rel="noopener" target="_blank" href="https://webba-booking.com/documentation/placeholders/#subjectplaceholders">' . __( 'List of available placeholders', 'wbk' ) . '</a></p>';
        echo  $html ;
    }
    
    // validate email to customer message (on approve)
    public function validate_email_customer_approve_subject( $input )
    {
        $input = sanitize_text_field( $input );
        return $input;
    }
    
    // render email to secondary
    public function render_email_secondary_book_status()
    {
        $value = get_option( 'wbk_email_secondary_book_status', '' );
        $html = '<input type="checkbox" ' . checked( 'true', $value, false ) . ' id="wbk_email_secondary_book_status" name="wbk_email_secondary_book_status" value="true" >';
        $html .= '<label for="wbk_email_secondary_book_status">' . __( 'Check if you\'d like to send an email to a customers from the group', 'wbk' ) . '</a>';
        echo  $html ;
    }
    
    // validate email to secondary
    public function validate_email_secondary_book_status( $input )
    {
        
        if ( $input != 'true' && $input != '' ) {
            $input = '';
            add_settings_error(
                'wbk_email_secondary_book_status',
                'wbk_email_secondary_book_status_error',
                __( 'Email status updated', 'wbk' ),
                'updated'
            );
        }
        
        return $input;
    }
    
    // render email to secondary message
    public function render_email_secondary_book_message()
    {
        $value = get_option( 'wbk_email_secondary_book_message' );
        $args = array(
            'media_buttons' => false,
            'editor_height' => 300,
        );
        echo  '<a class="button wbk_email_editor_toggle">' . __( 'Toggle editor', 'wbk' ) . '</a><div class="wbk_email_editor_wrap" style="display:none;">' ;
        wp_editor( $value, 'wbk_email_secondary_book_message', $args );
        echo  '</div>' ;
    }
    
    // validate email to secondary message
    public function validate_email_secondary_book_message( $input )
    {
        return $input;
    }
    
    // render secondary email subject
    public function render_email_secondary_book_subject()
    {
        $value = get_option( 'wbk_email_secondary_book_subject' );
        $value = sanitize_text_field( $value );
        $html = '<input type="text" id="wbk_email_secondary_book_subject" name="wbk_email_secondary_book_subject" value="' . $value . '" >';
        echo  $html ;
    }
    
    // validate email to secondary message
    public function validate_email_secondary_book_subject( $input )
    {
        $input = sanitize_text_field( $input );
        
        if ( !WBK_Validator::checkStringSize( $input, 1, 100 ) ) {
        } else {
            return $input;
        }
    
    }
    
    // render admin email subject
    public function render_email_admin_book_subject()
    {
        $value = get_option( 'wbk_email_admin_book_subject' );
        $value = sanitize_text_field( $value );
        $html = '<input type="text" id="wbk_email_admin_book_subject" name="wbk_email_admin_book_subject" value="' . $value . '" >';
        $html .= '<p class="description"><a rel="noopener" target="_blank" href="https://webba-booking.com/documentation/placeholders/">' . __( 'List of available placeholders', 'wbk' ) . '</a></p>';
        echo  $html ;
    }
    
    // validate email to admin message
    public function validate_email_admin_book_subject( $input )
    {
        $input = sanitize_text_field( $input );
        return $input;
    }
    
    // render admin daily subject
    public function render_email_admin_daily_subject()
    {
        $value = get_option( 'wbk_email_admin_daily_subject' );
        $value = sanitize_text_field( $value );
        $html = '<input type="text" id="wbk_email_admin_daily_subject" name="wbk_email_admin_daily_subject" value="' . $value . '" >';
        echo  $html ;
    }
    
    // validate email to admin message
    public function validate_email_admin_daily_subject( $input )
    {
        $input = sanitize_text_field( $input );
        return $input;
    }
    
    // render customer daily subject
    public function render_email_customer_daily_subject()
    {
        $value = get_option( 'wbk_email_customer_daily_subject' );
        $value = sanitize_text_field( $value );
        $html = '<input type="text" id="wbk_email_customer_daily_subject" name="wbk_email_customer_daily_subject" value="' . $value . '" >';
        $html .= '<p class="description"><a rel="noopener" target="_blank" href="https://webba-booking.com/documentation/placeholders/">' . __( 'List of available placeholders', 'wbk' ) . '</a></p>';
        echo  $html ;
    }
    
    // validate email to customer message
    public function validate_email_customer_daily_subject( $input )
    {
        $input = sanitize_text_field( $input );
        return $input;
    }
    
    // render invoice subject //  todo
    public function render_email_customer_invoice_subject()
    {
        $value = get_option( 'wbk_email_customer_invoice_subject', __( 'Invoice', 'wbk' ) );
        $html = '<input type="text" id="wbk_email_customer_invoice_subject" name="wbk_email_customer_invoice_subject" value="' . $value . '" >';
        $html .= '<p class="description"><a rel="noopener" target="_blank" href="https://webba-booking.com/documentation/placeholders/">' . __( 'List of available placeholders', 'wbk' ) . '</a></p>';
        echo  $html ;
    }
    
    // validate invoice subject
    public function validate_email_customer_invoice_subject( $input )
    {
        return $input;
    }
    
    // render email to admin
    public function render_email_admin_book_status()
    {
        $value = get_option( 'wbk_email_admin_book_status' );
        $html = '<input type="checkbox" ' . checked( 'true', $value, false ) . ' id="wbk_email_admin_book_status" name="wbk_email_admin_book_status" value="true" >';
        $html .= '<label for="wbk_email_admin_book_status">' . __( 'Check if you\'d like to send administrator an email', 'wbk' ) . '</a>';
        echo  $html ;
    }
    
    // validate email to admin
    public function validate_email_admin_book_status( $input )
    {
        
        if ( $input != 'true' && $input != '' ) {
            $input = '';
            add_settings_error(
                'wbk_email_admin_book_status',
                'wbk_email_admin_book_status_error',
                __( 'Email status updated', 'wbk' ),
                'updated'
            );
        }
        
        return $input;
    }
    
    /* START: ICal Generation   */
    public function render_email_admin_book_status_generate_ical()
    {
        $value = get_option( 'wbk_email_admin_book_status_generate_ical' );
        $html = '<input type="checkbox" ' . checked( 'true', $value, false ) . ' id="wbk_email_admin_book_status_generate_ical" name="wbk_email_admin_book_status_generate_ical" value="true" >';
        $html .= '<label for="wbk_email_admin_book_status_generate_ical">' . __( 'Check if you\'d like to attach iCal file to the notification', 'wbk' ) . '</a>';
        echo  $html ;
    }
    
    public function validate_email_admin_book_status_generate_ical( $input )
    {
        
        if ( $input != 'true' && $input != '' ) {
            $input = '';
            add_settings_error(
                'wbk_email_admin_book_status_generate_ical',
                'wbk_email_admin_book_status_generate_ical_error',
                __( 'Attach iCal file to the notification status updated', 'wbk' ),
                'updated'
            );
        }
        
        return $input;
    }
    
    public function render_email_customer_book_status_generate_ical()
    {
        $value = get_option( 'wbk_email_customer_book_status_generate_ical' );
        $html = '<input type="checkbox" ' . checked( 'true', $value, false ) . ' id="wbk_email_customer_book_status_generate_ical" name="wbk_email_customer_book_status_generate_ical" value="true" >';
        $html .= '<label for="wbk_email_customer_book_status_generate_ical">' . __( 'Check if you\'d like to attach iCal file to the notification', 'wbk' ) . '</a>';
        echo  $html ;
    }
    
    public function validate_email_customer_book_status_generate_ical( $input )
    {
        
        if ( $input != 'true' && $input != '' ) {
            $input = '';
            add_settings_error(
                'wbk_email_customer_book_status_generate_ical',
                'wbk_email_customer_book_status_generate_ical_error',
                __( 'Attach iCal file to the notification status updated', 'wbk' ),
                'updated'
            );
        }
        
        return $input;
    }
    
    /* END: ICal Generation   */
    // render email to admin daily
    public function render_email_admin_daily_status()
    {
        $value = get_option( 'wbk_email_admin_daily_status' );
        $html = '<input type="checkbox" ' . checked( 'true', $value, false ) . ' id="wbk_email_admin_daily_status" name="wbk_email_admin_daily_status" value="true" >';
        $html .= '<label for="wbk_email_admin_daily_status">' . __( 'Check if you\'d like to send reminders to administrator', 'wbk' ) . '</a>';
        echo  $html ;
    }
    
    // validate email to admin
    public function validate_email_admin_daily_status( $input )
    {
        
        if ( $input != 'true' && $input != '' ) {
            $input = '';
            add_settings_error(
                'wbk_email_admin_daily_status',
                'wbk_email_admin_daily_status_error',
                __( 'Email status updated', 'wbk' ),
                'updated'
            );
        }
        
        return $input;
    }
    
    public function render_email_customer_arrived_status()
    {
        $value = get_option( 'wbk_email_customer_arrived_status' );
        $html = '<input type="checkbox" ' . checked( 'true', $value, false ) . ' id="wbk_email_customer_arrived_status" name="wbk_email_customer_arrived_status" value="true" >';
        $html .= '<label for="wbk_email_customer_arrived_status">' . __( 'Check if you\'d like to send notification to customer when status is changed to Arrived', 'wbk' ) . '</a>';
        echo  $html ;
    }
    
    public function validate_email_customer_arrived_status( $input )
    {
        
        if ( $input != 'true' && $input != '' ) {
            $input = '';
            add_settings_error(
                'wbk_email_customer_arrived_status',
                'wbk_email_customer_arrived_status_error',
                __( 'Email status updated', 'wbk' ),
                'updated'
            );
        }
        
        return $input;
    }
    
    // render email to customer daily
    public function render_email_customer_daily_status()
    {
        $value = get_option( 'wbk_email_customer_daily_status' );
        $html = '<input type="checkbox" ' . checked( 'true', $value, false ) . ' id="wbk_email_customer_daily_status" name="wbk_email_customer_daily_status" value="true" >';
        $html .= '<label for="wbk_email_customer_daily_status">' . __( 'Check if you\'d like to send reminders to customer', 'wbk' ) . '</a>';
        echo  $html ;
    }
    
    // validate email to customer
    public function validate_email_customer_daily_status( $input )
    {
        
        if ( $input != 'true' && $input != '' ) {
            $input = '';
            add_settings_error(
                'wbk_email_customer_daily_status',
                'wbk_email_customer_daily_status_error',
                __( 'Email status updated', 'wbk' ),
                'updated'
            );
        }
        
        return $input;
    }
    
    // render email to admin message
    public function render_email_admin_book_message()
    {
        $value = get_option( 'wbk_email_admin_book_message' );
        $args = array(
            'media_buttons' => false,
            'editor_height' => 300,
        );
        echo  '<a class="button wbk_email_editor_toggle">' . __( 'Toggle editor', 'wbk' ) . '</a><div class="wbk_email_editor_wrap" style="display:none;">' ;
        wp_editor( $value, 'wbk_email_admin_book_message', $args );
        echo  '</div>' ;
    }
    
    // validate email to admin message
    public function validate_email_admin_book_message( $input )
    {
        return $input;
    }
    
    // render email to admin  daily message
    public function render_email_admin_daily_message()
    {
        $value = get_option( 'wbk_email_admin_daily_message' );
        $args = array(
            'media_buttons' => false,
            'editor_height' => 300,
        );
        echo  '<a class="button wbk_email_editor_toggle">' . __( 'Toggle editor', 'wbk' ) . '</a><div class="wbk_email_editor_wrap" style="display:none;">' ;
        wp_editor( $value, 'wbk_email_admin_daily_message', $args );
        echo  '</div>' ;
    }
    
    // validate email to admin daily message
    public function validate_email_admin_daily_message( $input )
    {
        return $input;
    }
    
    // render email to customer  daily message
    public function render_email_customer_daily_message()
    {
        $value = get_option( 'wbk_email_customer_daily_message' );
        $args = array(
            'media_buttons' => false,
            'editor_height' => 300,
        );
        echo  '<a class="button wbk_email_editor_toggle">' . __( 'Toggle editor', 'wbk' ) . '</a><div class="wbk_email_editor_wrap" style="display:none;">' ;
        wp_editor( $value, 'wbk_email_customer_daily_message', $args );
        echo  '</div>' ;
    }
    
    // validate email to customer daily message
    public function validate_email_customer_daily_message( $input )
    {
        return $input;
    }
    
    // render show locked as booked
    public function render_show_locked_as_booked()
    {
        $value = get_option( 'wbk_show_locked_as_booked', 'no' );
        $value = sanitize_text_field( $value );
        $html = '<select id="wbk_show_locked_as_booked" name="wbk_show_locked_as_booked">
				    <option ' . selected( $value, 'yes', false ) . ' value="yes">' . __( 'Yes', 'wbk' ) . '</option>
				    <option ' . selected( $value, 'no', false ) . ' value="no">' . __( 'No', 'wbk' ) . '</option>
   				 </select>';
        echo  $html ;
    }
    
    public function render_attachment_file_types()
    {
        $value = get_option( 'wbk_attachment_file_types', 'image/*' );
        $value = sanitize_text_field( $value );
        $html = '<input type="text" id="wbk_attachment_file_types" name="wbk_attachment_file_types" value="' . $value . '" >';
        $html .= '<p class="description">' . __( 'Example: file_extension. A file extension starting with the STOP character, e.g: .gif, .jpg, .png, .doc', 'wbk' ) . '</p>';
        $html .= '<p class="description">' . __( 'Example: audio/* all sound files are accepted.', 'wbk' ) . '</p>';
        $html .= '<p class="description">' . __( 'Example: video/* all video files are accepted.', 'wbk' ) . '</p>';
        $html .= '<p class="description">' . __( 'Example: image/* all image files are accepted.', 'wbk' ) . '</p>';
        echo  $html ;
    }
    
    public function validate_attachment_file_types( $input )
    {
        return sanitize_text_field( $input );
    }

}
function wbk_default_editor( $param )
{
    return 'tinymce';
}
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