<?php
/**
 * Block editor integration for articles.
 *
 * @package KarmaDocs
 */

namespace KarmaDocs\Admin;

use KarmaDocs\Features;
use KarmaDocs\PostTypes;
use KarmaDocs\Settings;
use KarmaDocs\Taxonomies;

defined( 'ABSPATH' ) || exit;

/**
 * Adds the "Knowledge Base" document panel (KB, category, icon, TOC, access, review).
 */
class Editor {

	/**
	 * Hooks.
	 */
	public function register() {
		add_action( 'enqueue_block_editor_assets', array( $this, 'enqueue' ) );
	}

	/**
	 * Categories of a KB as a depth-annotated flat list.
	 *
	 * @param int $kb_id KB id.
	 * @return array
	 */
	public static function category_options( $kb_id ) {
		$terms = get_terms(
			array(
				'taxonomy'   => Taxonomies::CATEGORY,
				'hide_empty' => false,
				'meta_key'   => 'kdocs_kb', // phpcs:ignore WordPress.DB.SlowDBQuery
				'meta_value' => (int) $kb_id, // phpcs:ignore WordPress.DB.SlowDBQuery
			)
		);
		if ( is_wp_error( $terms ) ) {
			return array();
		}
		$by_parent = array();
		foreach ( $terms as $term ) {
			$by_parent[ (int) $term->parent ][] = $term;
		}
		$out  = array();
		$walk = static function ( $parent, $depth ) use ( &$walk, &$out, $by_parent ) {
			if ( empty( $by_parent[ $parent ] ) ) {
				return;
			}
			$list = $by_parent[ $parent ];
			usort(
				$list,
				static function ( $a, $b ) {
					return (int) get_term_meta( $a->term_id, 'kdocs_order', true ) <=> (int) get_term_meta( $b->term_id, 'kdocs_order', true );
				}
			);
			foreach ( $list as $term ) {
				$out[] = array(
					'id'    => (int) $term->term_id,
					'name'  => html_entity_decode( $term->name, ENT_QUOTES, 'UTF-8' ),
					'depth' => $depth,
				);
				$walk( (int) $term->term_id, $depth + 1 );
			}
		};
		$walk( 0, 0 );
		return $out;
	}

	/**
	 * Enqueues the editor plugin on article screens.
	 */
	public function enqueue() {
		$screen = get_current_screen();
		$types  = Features::is_pro() ? array( PostTypes::ARTICLE, \KarmaDocs\Pro\Changelog::TYPE ) : array( PostTypes::ARTICLE );
		if ( ! $screen || ! in_array( $screen->post_type, $types, true ) ) {
			return;
		}
		$asset_file = KDOCS_PATH . 'build/editor.asset.php';
		if ( ! file_exists( $asset_file ) ) {
			return;
		}
		$asset = require $asset_file;
		wp_enqueue_script( 'kdocs-editor', KDOCS_URL . 'build/editor.js', $asset['dependencies'], $asset['version'], true );
		wp_set_script_translations( 'kdocs-editor', 'karma-docs', KDOCS_PATH . 'languages' );

		$kbs = array();
		foreach ( Taxonomies::get_kbs() as $kb ) {
			$kbs[] = array(
				'id'         => (int) $kb->term_id,
				'name'       => html_entity_decode( $kb->name, ENT_QUOTES, 'UTF-8' ),
				'categories' => self::category_options( $kb->term_id ),
			);
		}

		$roles = array();
		foreach ( wp_roles()->get_names() as $key => $name ) {
			$roles[] = array(
				'value' => $key,
				'label' => translate_user_role( $name ),
			);
		}

		wp_add_inline_script(
			'kdocs-editor',
			'window.kdocsEditor = ' . wp_json_encode(
				array(
					'kbs'         => $kbs,
					'isPro'       => Features::is_pro(),
					'upgradeUrl'  => Features::upgrade_url(),
					'roles'       => $roles,
					'reviewDays'  => (int) Settings::get( 'review_interval', 180 ),
					'builderUrl'  => admin_url( 'admin.php?page=karma-docs-builder' ),
					'summaries'   => Features::is_pro(),
					'aiWriter'    => Features::is_pro() && Settings::get( 'ai_enabled' ) && Settings::get( 'ai_writer' ),
					'versions'    => Features::is_pro() ? \KarmaDocs\Pro\Versions::all() : array(),
					'seoPlugin'   => \KarmaDocs\Frontend\Schema::has_seo_plugin(),
					'owners'      => Features::is_pro() ? array_map(
						static fn( $u ) => array(
							'id'   => (int) $u->ID,
							'name' => $u->display_name,
						),
						get_users(
							array(
								'capability' => 'edit_posts',
								'fields'     => array( 'ID', 'display_name' ),
								'number'     => 200,
							)
						)
					) : array(),
					'aiReady'     => '' !== (string) Settings::get( 'ai_key_' . Settings::get( 'ai_provider', 'anthropic' ), '' ),
					'settingsUrl' => admin_url( 'admin.php?page=karma-docs-settings&tab=ai' ),
				)
			) . ';',
			'before'
		);
	}
}