<?php
/**
 * Custom post type that holds the knowledge imported from files.
 *
 * Using a post type instead of a dedicated table is deliberate: the whole existing pipeline
 * (chunking, embedding, change tracking through save_post, deleting vectors when a post is
 * deleted) works out of the box with nothing extra to write.
 *
 * @package AI House
 */

defined( 'ABSPATH' ) || exit;

/**
 * Class MYBOT_Knowledge_CPT
 */
class MYBOT_Knowledge_CPT {

	/**
	 * Post type name.
	 *
	 * @var string
	 */
	const POST_TYPE = 'mybot_knowledge';

	/**
	 * Meta key holding the content fingerprint, used to skip identical files on re-import.
	 *
	 * @var string
	 */
	const META_HASH = '_mybot_knowledge_hash';

	/**
	 * Meta key holding the source file name.
	 *
	 * @var string
	 */
	const META_SOURCE = '_mybot_knowledge_source';

	/**
	 * Meta key holding the import batch identifier.
	 *
	 * @var string
	 */
	const META_BATCH = '_mybot_knowledge_batch';

	/**
	 * Registers the post type.
	 *
	 * Not public on the front end: the knowledge only exists for the bot to look up and must
	 * not create duplicate content pages for Google. Source citations therefore show the title only.
	 *
	 * @return void
	 */
	public function register() {
		register_post_type(
			self::POST_TYPE,
			array(
				'labels'              => array(
					'name'          => __( 'AI House Knowledge', 'aihouse' ),
					'singular_name' => __( 'Knowledge item', 'aihouse' ),
					'add_new_item'  => __( 'Add knowledge item', 'aihouse' ),
					'edit_item'     => __( 'Edit knowledge item', 'aihouse' ),
					'search_items'  => __( 'Search knowledge items', 'aihouse' ),
					'not_found'     => __( 'No knowledge items yet.', 'aihouse' ),
				),
				'description'         => __( 'Content the bot looks up when answering visitors.', 'aihouse' ),
				'public'              => false,
				'publicly_queryable'  => false,
				'exclude_from_search' => true,
				'show_ui'             => true,
				'show_in_menu'        => 'mybot',
				'show_in_rest'        => false,
				'show_in_nav_menus'   => false,
				'supports'            => array( 'title', 'editor' ),
				'has_archive'         => false,
				'rewrite'             => false,
				'hierarchical'        => false,
				'capability_type'     => 'post',
				'map_meta_cap'        => true,
				'delete_with_user'    => false,
			)
		);
	}

	/**
	 * Whether this post type is the knowledge base.
	 *
	 * @param string $post_type Post type name.
	 * @return bool
	 */
	public static function is_knowledge( $post_type ) {
		return self::POST_TYPE === $post_type;
	}

	/**
	 * Counts the knowledge items that currently exist.
	 *
	 * @return int
	 */
	public static function count() {
		$counts = wp_count_posts( self::POST_TYPE );

		return isset( $counts->publish ) ? (int) $counts->publish : 0;
	}
}