<?php
/**
 * The Post List Admin Area.
 *
 * @package automattic/jetpack-post-list
 */

namespace Automattic\Jetpack\Post_List;

use Automattic\Jetpack\Assets;
use WP_Post;
use WP_Screen;

/**
 * The Post_List Admin Area
 */
class Post_List {

	const PACKAGE_VERSION = '0.9.0';
	const FEATURE         = 'enhanced_post_list';

	/**
	 * The configuration method that is called from the jetpack-config package.
	 *
	 * @return Post_List Post_List instance.
	 */
	public static function configure() {
		add_post_type_support( 'post', self::FEATURE );
		add_post_type_support( 'page', self::FEATURE );
		return self::setup();
	}

	/**
	 * Convenience function to create an instance of the class and register the
	 * filters and actions. It allows for the feature to be set up without adding
	 * support for posts and pages.
	 *
	 * @return Post_List Post_List instance.
	 */
	public static function setup() {
		$post_list = self::get_instance();
		$post_list->register();
		return $post_list;
	}

	/**
	 * Initialize the Post List UI.
	 *
	 * @return Post_List Post_List instance.
	 */
	public static function get_instance() {
		return new Post_List();
	}

	/**
	 * Sets up Post List action callbacks.
	 */
	public function register() {
		if ( ! did_action( 'jetpack_on_posts_list_init' ) ) {
			add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_scripts' ) );
			add_action( 'current_screen', array( $this, 'add_filters_and_actions_for_screen' ) );
			add_filter( 'default_hidden_columns', array( $this, 'adjust_default_columns' ), 10, 2 );

			if ( wp_doing_ajax() && ! empty( $_POST['action'] ) && 'inline-save' === $_POST['action'] && check_ajax_referer( 'inlineeditnonce', '_inline_edit' ) ) {
				$this->add_filters_and_actions_quick_edit();
			}

			/**
			 * Action called after initializing Post_List Admin resources.
			 *
			 * @since 0.1.0
			 */
			do_action( 'jetpack_on_posts_list_init' );
		}
	}

	/**
	 * Enqueue scripts.
	 *
	 * @param string $hook Page hook.
	 */
	public function enqueue_scripts( $hook ) {
		if ( 'edit.php' === $hook ) {
			wp_enqueue_style(
				'jetpack_posts_list_ui_style',
				plugin_dir_url( __DIR__ ) . './src/style.css',
				array(),
				self::PACKAGE_VERSION
			);
			wp_style_add_data(
				'jetpack_posts_list_ui_style',
				'rtl',
				plugin_dir_url( __DIR__ ) . './src/rtl.css'
			);
			Assets::register_script(
				'jetpack_posts_list',
				'../build/index.js',
				__FILE__,
				array(
					'in_footer'  => true,
					'enqueue'    => true,
					'textdomain' => 'jetpack-post-list',
				)
			);
		}
	}

	/**
	 * Checks the current post type and customizes the post
	 * list columns if it is appropriate to do so.
	 *
	 * @param string $post_type The post type associated with the current request.
	 */
	public function maybe_customize_columns( $post_type ) {
		// Add the thumbnail column if this is specifically "Posts" or "Pages".
		if ( post_type_supports( $post_type, self::FEATURE ) ) {
			// Add the thumbnail column to the "Posts" admin table.
			add_filter( 'manage_posts_columns', array( $this, 'add_thumbnail_column' ), 10, 2 );
			add_action( 'manage_posts_custom_column', array( $this, 'populate_thumbnail_rows' ), 10, 2 );

			// Add the thumbnail column to the "Pages" admin table.
			add_filter( 'manage_pages_columns', array( $this, 'add_thumbnail_column' ) );
			add_action( 'manage_pages_custom_column', array( $this, 'populate_thumbnail_rows' ), 10, 2 );
		}
	}

	/**
	 * If the current_screen has 'edit' as the base, add filters and actions to change the post list tables.
	 *
	 * @param object $current_screen The current screen.
	 */
	public function add_filters_and_actions_for_screen( $current_screen ) {
		if ( 'edit' !== $current_screen->base ) {
			return;
		}

		$this->maybe_customize_columns( $current_screen->post_type );
		$this->maybe_add_copy_link_action( $current_screen->post_type );
	}

	/**
	 * Checks the current post type and adds the Copy link post
	 * action if it is appropriate to do so.
	 *
	 * @param string $post_type The post type associated with the current request.
	 */
	public function maybe_add_copy_link_action( $post_type ) {
		if ( ! is_post_type_viewable( $post_type ) ) {
			return;
		}
		add_filter( 'post_row_actions', array( $this, 'add_copy_link_action' ), 20, 2 );
		add_filter( 'page_row_actions', array( $this, 'add_copy_link_action' ), 20, 2 );
	}

	/**
	 * Adds the Copy link post action which copies the post link to the clipboard.
	 *
	 * @param array   $post_actions The current array of post actions.
	 * @param WP_Post $post The current post in the post list table.
	 *
	 * @return array The modified post actions array.
	 */
	public function add_copy_link_action( $post_actions, $post ) {
		if ( $post->post_status === 'trash' ) {
			return $post_actions;
		}

		$post_actions['copy-link'] = sprintf(
			'<a href="%1$s" aria-label="%2$s" class="jetpack-post-list__copy-link-action">%3$s</a>',
			esc_url( get_permalink( $post ) ),
			esc_html__( 'Copy link to clipboard', 'jetpack-post-list' ),
			esc_html__( 'Copy link', 'jetpack-post-list' )
		);
		return $post_actions;
	}

	/**
	 * Checks if the current quick edit save is for a post list
	 * where we want to customize the columns. If so, then we call
	 * the methods to register the actions.
	 */
	public function add_filters_and_actions_quick_edit() {
		// We've already verified the nonce in the register method above, and we're not performing
		// any action on these POST arguments.
		// phpcs:disable WordPress.Security.NonceVerification.Missing
		if ( ! empty( $_POST['screen'] ) && str_starts_with( sanitize_key( $_POST['screen'] ), 'edit-' ) && ! empty( $_POST['post_type'] ) ) {
			$type = sanitize_key( $_POST['post_type'] );
			$this->maybe_customize_columns( $type );
		}
		// phpcs:enable WordPress.Security.NonceVerification.Missing
	}

	/**
	 * Adds a new column header for displaying the thumbnail of a post.
	 *
	 * @param array  $columns An array of column names.
	 * @param string $post_type The post type being displayed in the post list. Defaults to 'page'.
	 * @return array An array of column names.
	 */
	public function add_thumbnail_column( $columns, $post_type = 'page' ) {
		if ( ! post_type_supports( $post_type, 'thumbnail' ) ) {
			return $columns;
		}

		$new_column = array( 'thumbnail' => '<span>' . __( 'Thumbnail', 'jetpack-post-list' ) . '</span>' );
		$keys       = array_keys( $columns );
		$position   = array_search( 'title', $keys, true );

		// If 'title' not found, don't insert the thumbnail column.
		if ( false !== $position ) {
			$columns = array_merge( array_slice( $columns, 0, $position ), $new_column, array_slice( $columns, $position ) );
		}

		return $columns;
	}

	/**
	 * Displays the thumbnail content.
	 *
	 * @param string $column  The name of the column to display.
	 * @param int    $post_id The current post ID.
	 */
	public function populate_thumbnail_rows( $column, $post_id ) {
		if ( 'thumbnail' !== $column ) {
			return;
		}

		$thumbnail = Post_Thumbnail::get_post_thumbnail( get_post( $post_id ) );
		if ( $thumbnail ) {
			echo '<img src="' . esc_url( $thumbnail['thumb'] ) . '" alt="' . esc_attr( $thumbnail['alt'] ) . '" height="50" width="50" />';
		} else {
			echo '<span class="dashicons dashicons-format-image" title="No thumbnail found."></span>';
		}
	}

	/**
	 * Removes the tags and columns from the posts and pages
	 * screens if the screen options haven't been changed from
	 * the default.
	 *
	 * @param array     $cols The columns to hide.
	 * @param WP_Screen $screen The current screen object.
	 * @return array    The columns to hide by default.
	 */
	public function adjust_default_columns( $cols, $screen ) {
		if ( ! ( 'edit' === $screen->base && post_type_supports( $screen->post_type, self::FEATURE ) ) ) {
			return $cols;
		}

		$cols[] = 'tags';
		if ( 'post' === $screen->post_type ) {
			$cols[] = 'categories';
		}

		return $cols;
	}
}
