<?php

namespace TFGraphics\SmartImport\Search;

use TFGraphics\SmartImport\Domain\Search\MediaType;
use TFGraphics\SmartImport\DomainEngine\DomainEngine;
use TFGraphics\SmartImport\DomainEngine\Exceptions\DiscoveryUnresolvedException;

/**
 * MediaDetector — thin adapter between Search pipeline and DomainEngine.
 *
 * Replaces the previous stub that hardcoded everything to MediaType::BOOK.
 * Delegates all classification logic to DomainEngine (DISCOVERY-001).
 *
 * NOTE: type hint uses Search\SearchContext (this namespace), NOT
 * Domain\Search\SearchContext — they are two distinct classes.
 */
final class MediaDetector
{
    private DomainEngine $domainEngine;

    public function __construct(DomainEngine $domainEngine)
    {
        $this->domainEngine = $domainEngine;
    }

    /**
     * Detect the media type for the given SearchContext.
     * Returns a new SearchContext with the resolved MediaType applied.
     *
     * @param SearchContext $context  Search\SearchContext (pipeline context)
     */
    public function detect(SearchContext $context): SearchContext
    {
        $query = trim($context->getRequest()->getQuery());
        if ($query === '') {
            return $context->withResolvedMediaType(MediaType::UNKNOWN);
        }

        $hint = $context->getRequest()->getMediaType();
        $hint = ($hint === MediaType::AUTO || $hint === MediaType::UNKNOWN) ? null : $hint;

        try {
            $domainResolution = $this->domainEngine->resolve($query, $hint);

            if ($domainResolution->requiresOperatorInput()) {
                return $context->withResolvedMediaType(MediaType::UNKNOWN);
            }

            return $context->withResolvedMediaType($domainResolution->getResolvedDomain());

        } catch (DiscoveryUnresolvedException $e) {
            return $context->withResolvedMediaType(MediaType::UNKNOWN);
        }
    }
}