<?php
/**
 * Plugin Name:       JJStreet App News Control
 * Description:       Enables hiding news from app or from web. Custom witten for the best dance studio in the world -- JJStreet!
 * Version:       	  1.0
 * Author:            Hemles Gangsterz
 * Author URI:		  https://hemles.com
 */

/* Define the custom box */
add_action( 'add_meta_boxes', 'wpse_61041_add_custom_box' );

/* Do something with the data entered */
add_action( 'save_post', 'wpse_61041_save_postdata' );

/* Adds a box to the main column on the Post and Page edit screens */
function wpse_61041_add_custom_box() {
    add_meta_box(
        'wpse_61041_sectionid',
        'Äppis kuvamine',
        'wpse_61041_inner_custom_box',
        'post',
        'side',
        'high'
    );
}

/* Prints the box content */
function wpse_61041_inner_custom_box($post)
{
    // Use nonce for verification
    wp_nonce_field( 'wpse_61041_wpse_61041_field_nonce', 'wpse_61041_noncename' );

    // Get saved value, if none exists, "default" is selected
    $saved = get_post_meta( $post->ID, 'app_news_control', true);
    if( !$saved )
        $saved = 'both';

    $fields = array(
        'web'       => __('Ainult veebis', 'wpse'),
        'app'     => __('Ainult äppis', 'wpse'),
        'both'      => __('Mõlemas', 'wpse'),
    );

    foreach($fields as $key => $label)
    {
        printf(
            '<input type="radio" name="app_news_control" value="%1$s" id="app_news_control[%1$s]" %3$s />'.
            '<label for="app_news_control[%1$s]"> %2$s ' .
            '</label><br>',
            esc_attr($key),
            esc_html($label),
            checked($saved, $key, false)
        );
    }
}

/* When the post is saved, saves our custom data */
function wpse_61041_save_postdata( $post_id )
{
      // verify if this is an auto save routine.
      // If it is our form has not been submitted, so we dont want to do anything
      if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE )
          return;

      // verify this came from the our screen and with proper authorization,
      // because save_post can be triggered at other times
      if ( !wp_verify_nonce( $_POST['wpse_61041_noncename'], 'wpse_61041_wpse_61041_field_nonce' ) )
          return;

      if ( isset($_POST['app_news_control']) && $_POST['app_news_control'] != "" ){
            update_post_meta( $post_id, 'app_news_control', $_POST['app_news_control'] );
      }
}

/* Hides news, that have only app value: */
function my_pre_get_posts($query) {

	// Check this is main query and other conditionals as needed
	if($query->is_main_query()) {
		$query->set(
			'meta_query',
			array(
				'relation' => 'OR',
					array(
						'key' => 'app_news_control',
						'value' => array('both', 'web'),
					),
					array(
						'key' => 'app_news_control',
						'compare' => 'NOT EXISTS'
					)
			)
		);
	}
}

/* This should not be for admin: */
if (!is_admin()) add_action('pre_get_posts' , 'my_pre_get_posts');