<?php

namespace App\Services;

use App\DTOs\ClassificationResultDTO;
use App\Models\AIDecision;
use App\Models\Article;
use App\Models\Ticket;
use App\Repositories\Contracts\ArticleRepositoryInterface;

class SemanticSearchService
{
    public function __construct(
        private readonly EmbeddingService $embeddingService,
        private readonly ArticleRepositoryInterface $articleRepository,
        private readonly AIClassifierService $classifierService,
    ) {}

    public function findBestArticle(Ticket $ticket): array
    {
        $embedding = $ticket->embedding ?? $this->embeddingService->embed($ticket->message);
        if ($ticket->embedding === null) {
            $ticket->embedding = $embedding;
            $ticket->save();
        }

        $candidates = $this->articleRepository->findSimilarByEmbedding($embedding, 5);
        $classification = $this->classifierService->rank($ticket->message, $candidates);

        $bestArticle = $classification->articleId ? Article::find($classification->articleId) : null;

        AIDecision::query()->create([
            'ticket_id' => $ticket->id,
            'article_id' => $bestArticle?->id,
            'confidence' => $classification->confidence,
            'explanation' => $classification->explanation,
            'raw_response' => $classification->rawResponse,
        ]);

        return [
            'best_article' => $bestArticle,
            'confidence' => $classification->confidence,
            'explanation' => $classification->explanation,
            'top_3_candidates' => collect($candidates)->take(3)->map(fn ($c) => $c->toArray())->values()->all(),
        ];
    }
}