<?php
/**
 * Control 7 — contents of public types (SPEC row 7).
 *
 * Recent items come out as the member code content_recent; PassAccumulator
 * folds them into one "to identify" line per type.
 *
 * @package Timaub\AfterHackChecklist
 */

namespace Timaub\AfterHackChecklist\Domain\Rules;

use Timaub\AfterHackChecklist\Domain\Assumptions;
use Timaub\AfterHackChecklist\Domain\ContentEntry;
use Timaub\AfterHackChecklist\Domain\Context;
use Timaub\AfterHackChecklist\Domain\Finding;
use Timaub\AfterHackChecklist\Domain\Patterns;
use Timaub\AfterHackChecklist\Domain\Text;

final class ContentRules {

	/** @return Finding[] */
	public static function inspect( ContentEntry $c, Context $ctx ): array {
		if ( in_array( $c->status, Assumptions::CONTENT_EXCLUDED_STATUSES, true ) ) {
			return array();
		}
		$out     = array();
		$subject = $c->type . ' ' . $c->id;
		$ref     = $ctx->referenceDate;
		if ( '' !== $ref ) {
			$date = self::onOrAfter( $c->postModified, $ref ) ? $c->postModified : ( self::onOrAfter( $c->postDate, $ref ) ? $c->postDate : '' );
			if ( '' !== $date ) {
				$out[] = Finding::make( 'content_recent', $subject, array( $c->type, (string) $c->id, $c->title, (string) $c->authorId, $date ) );
			}
		}
		$hit = self::marker( $c->content, $ctx );
		if ( null !== $hit ) {
			// Up to 3 excerpts around distinct occurrences of the markers (D-09).
			$excerpt = Text::excerptsAround( $c->content, array_merge( Assumptions::CONTENT_MARKERS, Assumptions::JSON_ESCAPED_MARKERS, array( '<iframe' ) ), $hit[1] );
			$out[]   = Finding::make( 'content_marker', $subject, array( $c->type, (string) $c->id, $c->title, $hit[0] ), $excerpt );
		}
		if ( '' !== $ref && null !== $c->authorRegistered && self::onOrAfter( $c->authorRegistered, $ref ) ) {
			$out[] = Finding::make( 'content_author_recent', $subject, array( $c->type, (string) $c->id, $c->title, (string) $c->authorId, $c->authorRegistered, $ref ) );
		}
		return $out;
	}

	private static function onOrAfter( string $datetime, string $ref ): bool {
		return '' !== $datetime && strcmp( substr( $datetime, 0, 10 ), $ref ) >= 0;
	}

	/**
	 * First marker of CONTENT_MARKERS, or an iframe whose src is on another host.
	 *
	 * @return array{0:string,1:int}|null
	 */
	private static function marker( string $content, Context $ctx ) {
		$hit = Text::firstMarker( $content, array_merge( Assumptions::CONTENT_MARKERS, Assumptions::JSON_ESCAPED_MARKERS ) );
		if ( null !== $hit ) {
			return $hit;
		}
		foreach ( Patterns::iframeSources( $content ) as $src ) {
			$host = Text::hostOf( $src );
			if ( '' !== $host && ! Text::isSiteHost( $host, $ctx->siteHosts ) ) {
				$pos = strpos( $content, $src );
				return array( '<iframe', false === $pos ? 0 : $pos );
			}
		}
		return null;
	}
}