<?php
defined('ABSPATH') or die();
/**
 * @package Admin_Column_Custom
 */

/**
 * Adds the custom column in posts and terms list tables
 *
 * @since 1.2
 */
class Admin_Column_Custom
{
	/**
	 * Constructor: setups filters and actions
	 *
	 * @since 1.0
	 *
	 */
	public function __construct()
	{
		// Hide the column of the custom columns.
		add_filter('hidden_columns', array($this, 'hidden_columns')); // Since WP 4.4.
		
		// Add the custom columns in 'All Posts', 'All Pages' panels.
		foreach ( $this->get_post_types() as $type ) {
			// Use the latest filter late as some plugins purely overwrite what's done by others :(
			// Specific case for media.
			add_filter( 'manage_' . ( 'attachment' == $type ? 'upload' : 'edit-' . $type ) . '_columns', array( $this, 'add_post_column' ), 100 );
			add_action( 'manage_' . ( 'attachment' == $type ? 'media' : $type . '_posts' ) . '_custom_column', array( $this, 'post_column' ), 10, 2 );
		}
	}

	/**
	 * Adds custom columns in posts, pages, categories and tags tables.
	 *
	 * @since 1.0
	 *
	 * @param string[] $columns List of table columns.
	 * @param string   $before  The column before which we want to add our fields.
	 * @return string[] Modified list of columns.
	 */
	protected function add_column($columns = [], $before = '')
	{
		if ($n = array_search($before, array_keys($columns))) 
		{
			$end = array_slice( $columns, $n );
			$columns = array_slice( $columns, 0, $n );
		}

		foreach ($this->get_custom_columns() as $name => $title) {
			$columns[ $name ] = esc_html( $title );
		}
		
		return isset( $end ) ? array_merge( $columns, $end ) : $columns;
	}

	/**
	 * Adds the custom columns ( before the comments column ) in the posts, pages and media library tables.
	 *
	 * @since 1.0
	 *
	 * @param string[] $columns List of posts table columns.
	 * @return string[] Modified list of columns.
	 */
	public function add_post_column($columns = []) 
	{
		return $this->add_column( $columns, 'author' );
	}

	/**
	 * Get post_types.
	 *
	 * @since 1.0
	 *
	 * @return string[] list of post_types.
	 */
	public function get_post_types()
	{
		$args = array(
			'public' => true
		);

		return get_post_types( $args );
	}

	/**
	 * Get custom columns.
	 *
	 * @since 1.0
	 *
	 * @return string[] list of columns.
	 */
	public function get_custom_columns()
	{
		$columns = array(
			'custom_name' => 'Name'
		);

		return $columns;
	}

	/**
	 * Fills the custom columns in the posts, pages and media library tables
	 * take care that when doing ajax inline edit, the post may not be updated in database yet
	 *
	 * @since 1.0
	 *
	 * @param string $column  Column name
	 * @param int    $post_id
	 * @return void
	 */
	public function post_column($column = '', $post_id = 0) 
	{
		// $inline = wp_doing_ajax() && isset( $_REQUEST['action'], $_POST['inline_lang_choice'] ) && 'inline-save' === $_REQUEST['action']; // phpcs:ignore WordPress.Security.NonceVerification

		// $lang = $inline ? $this->model->get_language( sanitize_key( $_POST['inline_lang_choice'] ) ) : $this->model->post->get_language( $post_id ); // phpcs:ignore WordPress.Security.NonceVerification

		if (false === strpos($column, 'custom_') || $post_id == 0) {
			return;
		}

		if (strpos($column, 'meta_')>-1) {
			$value = get_post_meta($post_id, substr($column, 12), true);
		} else {
			$p = get_post( $post_id );

			$key = 'post_' . substr($column, 7);

			$value = isset($p->$key) ? $p->$key : '';
		}

		if ( empty( $value ) ) {
			return;
		}

		echo esc_html( $value );
	}

	/**
	 * Hides the column for the custom fields.
	 *
	 * @since 2.7
	 *
	 * @param string[] $hidden Array of hidden columns.
	 * @return string[]
	 */
	public function hidden_columns( $hidden ) {
		
		$hidden[] = 'custom_name';
		
		return $hidden;
	}

	/**
	 * Can't hide these for they are special.
	 * 
	 * wp-admin/includes/class-wp-screen.php
	 * 
	 * Line 1164 in function `render_list_table_columns_preferences`;
	 * 
	 */
	function get_special_columns()
	{
		$special = array( '_title', 'cb', 'comment', 'media', 'name', 'title', 'username', 'blogname' );

		return $special;
	}
}