<?php

namespace RoosterLMS\CourseBuilder;

use RoosterLMS\Content\PostTypes;
use RoosterLMS\I18n\Language;
use RoosterLMS\I18n\Names;
use RoosterLMS\I18n\Providers;

defined( 'ABSPATH' ) || exit;

final class ContentInfo {

	public const TYPES = array( PostTypes::COURSE, PostTypes::LESSON, PostTypes::QUIZ );

	public const EXCERPT_WORDS = 40;

	public static function resolve( int $post_id, string $lang ): ?\WP_Post {
		$post = $post_id > 0 ? get_post( $post_id ) : null;
		if ( ! $post instanceof \WP_Post || ! in_array( $post->post_type, self::TYPES, true ) ) {
			return null;
		}
		$lang = '' !== $lang ? Names::match( $lang ) : '';
		if ( '' === $lang ) {
			return $post;
		}
		$translations = Providers::current()->post_translations( $post->ID );
		if ( array() === $translations ) {
			return $post;
		}
		foreach ( $translations as $code => $id ) {
			if ( Language::normalize( (string) $code ) === $lang ) {
				$found = get_post( (int) $id );
				return $found instanceof \WP_Post && $found->post_type === $post->post_type ? $found : null;
			}
		}
		return null;
	}

	public static function missing( int $post_id, string $lang ): bool {
		$post = $post_id > 0 ? get_post( $post_id ) : null;
		return $post instanceof \WP_Post && in_array( $post->post_type, self::TYPES, true ) && null === self::resolve( $post_id, $lang );
	}

	public static function words( string $content ): int {
		$text = wp_strip_all_tags( strip_shortcodes( (string) preg_replace( '/<!--.*?-->/s', ' ', $content ) ) );
		$text = html_entity_decode( $text, ENT_QUOTES | ENT_HTML5, 'UTF-8' );
		$n    = preg_match_all( '/[\p{L}\p{N}]+(?:[\'’\-][\p{L}\p{N}]+)*/u', $text );
		return false === $n ? 0 : $n;
	}

	public static function excerpt( \WP_Post $post ): string {
		$own = trim( wp_strip_all_tags( (string) $post->post_excerpt ) );
		if ( '' !== $own ) {
			return $own;
		}
		$text = wp_strip_all_tags( strip_shortcodes( (string) preg_replace( '/<!--.*?-->/s', ' ', (string) $post->post_content ) ) );
		return wp_trim_words( html_entity_decode( $text, ENT_QUOTES | ENT_HTML5, 'UTF-8' ), self::EXCERPT_WORDS, '…' );
	}

	public static function elementor_edits( string $post_type ): bool {
		if ( ! defined( 'ELEMENTOR_VERSION' ) ) {
			return false;
		}
		$types = get_option( 'elementor_cpt_support', array( 'page', 'post' ) );
		return is_array( $types ) && in_array( $post_type, $types, true );
	}

	public static function built_with_elementor( int $post_id ): bool {
		return defined( 'ELEMENTOR_VERSION' ) && 'builder' === (string) get_post_meta( $post_id, '_elementor_edit_mode', true );
	}

	public static function summary( \WP_Post $post, string $lang, int $user_id ): array {
		$type      = get_post_type_object( $post->post_type );
		$rest_base = null !== $type && $type->show_in_rest ? ( is_string( $type->rest_base ) && '' !== $type->rest_base ? $type->rest_base : $post->post_type ) : '';
		$elementor = self::elementor_edits( $post->post_type ) && user_can( $user_id, 'edit_post', $post->ID );
		$own_lang  = Providers::current()->post_language( $post->ID );
		return array(
			'post_id'         => $post->ID,
			'type'            => $post->post_type,
			'lang'            => '' !== $own_lang ? Language::normalize( $own_lang ) : ( '' !== $lang ? $lang : Names::default_language() ),
			'exists'          => true,
			'title'           => trim( wp_strip_all_tags( $post->post_title ) ),
			'status'          => $post->post_status,
			'excerpt'         => self::excerpt( $post ),
			'own_excerpt'     => '' !== trim( (string) $post->post_excerpt ),
			'words'           => self::words( (string) $post->post_content ),
			'empty'           => '' === trim( (string) $post->post_content ),
			'modified'        => mysql_to_rfc3339( (string) $post->post_modified_gmt ),
			'frame_url'       => ContentFrame::url( $post->ID ),
			'edit_url'        => (string) get_edit_post_link( $post->ID, 'raw' ),
			'elementor_url'   => $elementor ? add_query_arg(
				array(
					'post'   => $post->ID,
					'action' => 'elementor',
				),
				admin_url( 'post.php' )
			) : '',
			'elementor_built' => self::built_with_elementor( $post->ID ),
			'rest_path'       => '' !== $rest_base ? '/wp/v2/' . $rest_base . '/' . $post->ID : '',
			'can_admin'       => user_can( $user_id, 'edit_posts' ) || user_can( $user_id, Access::PAGE_CAP ),
		);
	}

	public const PREVIEW_MAX = 200000;

	public static function preview_html( \WP_Post $post ): string {
		$content = (string) $post->post_content;
		if ( '' === trim( $content ) ) {
			return '';
		}
		$previous        = $GLOBALS['post'] ?? null;
		$GLOBALS['post'] = $post; // phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited -- put back below.
		try {
			$html = has_blocks( $content ) ? do_blocks( $content ) : wpautop( $content );
			$html = do_shortcode( shortcode_unautop( $html ) );
		} catch ( \Throwable $e ) {
			$html = wpautop( esc_html( wp_strip_all_tags( $content ) ) );
		} finally {
			$GLOBALS['post'] = $previous; // phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited -- the caller's.
		}
		$html = wp_kses_post( (string) preg_replace( '/<!--.*?-->/s', '', $html ) );
		return strlen( $html ) > self::PREVIEW_MAX ? wp_kses_post( force_balance_tags( substr( $html, 0, self::PREVIEW_MAX ) ) ) : trim( $html );
	}

	public static function missing_summary( \WP_Post $source, string $lang ): array {
		return array(
			'post_id'  => 0,
			'source'   => $source->ID,
			'type'     => $source->post_type,
			'lang'     => $lang,
			'exists'   => false,
			'title'    => trim( wp_strip_all_tags( $source->post_title ) ),
			'edit_url' => (string) get_edit_post_link( $source->ID, 'raw' ),
		);
	}
}