<?php
/**
 * Multisite: network activation, new and deleted sites, network overview.
 *
 * @package KarmaDocs
 */

namespace KarmaDocs;

defined( 'ABSPATH' ) || exit;

/**
 * Every site of a network keeps its own docs, settings and tables (the usual
 * per-site table prefix). When the plugin is network-activated:
 *
 * - activation sets up the first sites at once and the rest on their first
 *   request (a large network would time out otherwise);
 * - sites created later are set up when they are created;
 * - a deleted site's tables are dropped with it (`wpmu_drop_tables`);
 * - Network Admin → Karma Docs lists the sites with their documentation. With
 *   Freemius the license is managed there for the whole network.
 */
class Multisite {

	/**
	 * Sites set up during network activation; the others on first request.
	 */
	const ACTIVATE_NOW = 50;

	/**
	 * Hooks.
	 */
	public function register() {
		if ( ! is_multisite() ) {
			return;
		}
		add_action( 'wp_initialize_site', array( $this, 'new_site' ), 200 );
		add_filter( 'wpmu_drop_tables', array( $this, 'drop_tables' ), 10, 2 );
		add_action( 'init', array( $this, 'maybe_setup' ), 1 );
		add_action( 'network_admin_menu', array( $this, 'menu' ) );
	}

	/**
	 * Whether the plugin is active for the whole network.
	 *
	 * @return bool
	 */
	public static function network_active() {
		return is_multisite() && array_key_exists( KDOCS_BASENAME, (array) get_site_option( 'active_sitewide_plugins', array() ) );
	}

	/**
	 * Network activation: sets up the first sites now.
	 */
	public static function activate_network() {
		$sites = get_sites(
			array(
				'fields'   => 'ids',
				'number'   => self::ACTIVATE_NOW,
				'archived' => 0,
				'deleted'  => 0,
			)
		);
		foreach ( $sites as $site_id ) {
			switch_to_blog( $site_id );
			Install::activate_site();
			restore_current_blog();
		}
	}

	/**
	 * A site of a network-activated install that hasn't been set up yet
	 * (beyond the first sites at activation) is set up on its first request.
	 */
	public function maybe_setup() {
		if ( self::network_active() && ! get_option( 'kdocs_installed_at' ) ) {
			Install::activate_site( false );
		}
	}

	/**
	 * New site in a network where the plugin is network-active.
	 *
	 * @param \WP_Site $site Site.
	 */
	public function new_site( $site ) {
		if ( ! self::network_active() ) {
			return;
		}
		switch_to_blog( (int) $site->blog_id );
		Install::activate_site( false );
		restore_current_blog();
	}

	/**
	 * Drops the plugin tables with a deleted site.
	 *
	 * @param string[] $tables  Tables WordPress will drop.
	 * @param int      $site_id Site.
	 * @return string[]
	 */
	public function drop_tables( $tables, $site_id ) {
		global $wpdb;
		$prefix = $wpdb->get_blog_prefix( $site_id );
		foreach ( Install::tables() as $table ) {
			$tables[] = $prefix . 'kdocs_' . $table;
		}
		return $tables;
	}

	/**
	 * Network Admin → Karma Docs.
	 */
	public function menu() {
		add_menu_page(
			__( 'Karma Docs', 'karma-docs' ),
			Admin\Admin::menu_label(),
			'manage_network_options',
			'karma-docs',
			array( $this, 'render' ),
			'dashicons-book-alt',
			30
		);
	}

	/**
	 * Documentation per site.
	 *
	 * @return array[] id, name, url, admin, kbs, articles, ready.
	 */
	public static function overview() {
		$rows = array();
		foreach ( get_sites(
			array(
				'number'  => 200,
				'deleted' => 0,
			)
		) as $site ) {
			switch_to_blog( (int) $site->blog_id );
			$counts = wp_count_posts( PostTypes::ARTICLE );
			$kbs    = wp_count_terms(
				array(
					'taxonomy'   => Taxonomies::KB,
					'hide_empty' => false,
				)
			);
			$rows[] = array(
				'id'       => (int) $site->blog_id,
				'name'     => get_bloginfo( 'name' ),
				'url'      => home_url( '/' ),
				'admin'    => admin_url( 'admin.php?page=karma-docs' ),
				'kbs'      => is_wp_error( $kbs ) ? 0 : (int) $kbs,
				'articles' => (int) ( $counts->publish ?? 0 ),
				'ready'    => (bool) get_option( 'kdocs_installed_at' ),
			);
			restore_current_blog();
		}
		return $rows;
	}

	/**
	 * Network page.
	 */
	public function render() {
		$rows = self::overview();
		echo '<div class="wrap"><h1>' . esc_html__( 'Karma Docs on this network', 'karma-docs' ) . '</h1>';
		echo '<p>' . esc_html__( 'Each site has its own knowledge bases, settings and analytics. Open a site to manage its documentation.', 'karma-docs' ) . '</p>';
		if ( ! self::network_active() ) {
			echo '<p>' . esc_html__( 'The plugin is activated per site. Network-activate it to set it up on every site, including new ones.', 'karma-docs' ) . '</p>';
		}
		echo '<table class="widefat striped"><caption class="screen-reader-text">' . esc_html__( 'Sites', 'karma-docs' ) . '</caption><thead><tr>';
		foreach ( array( __( 'Site', 'karma-docs' ), __( 'Knowledge bases', 'karma-docs' ), __( 'Published articles', 'karma-docs' ), __( 'Status', 'karma-docs' ) ) as $label ) {
			echo '<th scope="col">' . esc_html( $label ) . '</th>';
		}
		echo '</tr></thead><tbody>';
		foreach ( $rows as $row ) {
			echo '<tr><td><strong><a href="' . esc_url( $row['admin'] ) . '">' . esc_html( $row['name'] ) . '</a></strong><br><a href="' . esc_url( $row['url'] ) . '">' . esc_html( $row['url'] ) . '</a></td>';
			echo '<td>' . (int) $row['kbs'] . '</td><td>' . (int) $row['articles'] . '</td>';
			echo '<td>' . ( $row['ready'] ? esc_html__( 'Set up', 'karma-docs' ) : esc_html__( 'Not set up yet (on first visit)', 'karma-docs' ) ) . '</td></tr>';
		}
		echo '</tbody></table></div>';
	}
}