<?php

declare(strict_types=1);

namespace LinkCheckup\Features\PlaceHighlight;

use LinkCheckup\Shared\Links\Link;
use LinkCheckup\Shared\Links\LinkLookup;

final class PlaceHighlighter {

	private const NO_LINK = 0;

	private bool $is_resolved = false;
	private Link|null $link   = null;
	private bool $is_anchored = false;

	public function __construct(
		private PlaceRequest $place_request,
		private LinkLookup $link_lookup,
		private PlaceMarker $place_marker,
		private PlaceLabel $place_label
	) {
	}

	public function is_requested(): bool {
		return null !== $this->requested_link();
	}

	public function highlight( string $content ): string {
		$link = $this->requested_link();

		if ( null === $link ) {
			return $content;
		}

		$marked = $this->place_marker->mark(
			$content,
			$link->url,
			$this->place_label->of( $link->verdict )
		);

		if ( $this->is_anchored || $marked === $content ) {
			return $marked;
		}

		$this->is_anchored = true;

		return $this->place_marker->with_anchor( $marked );
	}

	private function requested_link(): Link|null {
		if ( $this->is_resolved ) {
			return $this->link;
		}

		$link_id = $this->place_request->link_id();

		$this->is_resolved = true;
		$this->link        = self::NO_LINK === $link_id
			? null
			: $this->link_lookup->find( $link_id );

		return $this->link;
	}
}