package ru.soune.nocopy.handler;

import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import ru.soune.nocopy.dto.BaseRequest;
import ru.soune.nocopy.dto.BaseResponse;
import ru.soune.nocopy.dto.MessageCode;
import ru.soune.nocopy.dto.file.ImageSearchRequest;
import ru.soune.nocopy.dto.file.YandexSearchResponse;
import ru.soune.nocopy.entity.file.FileEntity;
import ru.soune.nocopy.exception.NotValidFieldException;
import ru.soune.nocopy.repository.FileEntityRepository;
import ru.soune.nocopy.service.file.CheckCounterService;
import ru.soune.nocopy.service.search.SearchApiToYandexResponseMapper;
import ru.soune.nocopy.service.search.SearchImageService;
import ru.soune.nocopy.service.search.GoogleVisionSearchService;
import ru.soune.nocopy.service.tariff.TariffConstants;
import ru.soune.nocopy.service.tariff.TariffInfoService;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeoutException;

@Slf4j
@Component
@RequiredArgsConstructor
public class ImageFoundRequestHandler implements RequestHandler {

    private final ObjectMapper objectMapper;

    private final SearchImageService searchImageService;

    private final GoogleVisionSearchService googleVisionSearchService;

    private final CheckCounterService checkCounterService;

    private final FileEntityRepository fileEntityRepository;

    private final TariffInfoService tariffInfoService;

    private final SearchApiToYandexResponseMapper mapper = new SearchApiToYandexResponseMapper();

    @Override
    public BaseResponse handle(BaseRequest request) throws Exception {
        ImageSearchRequest imageSearchRequest = objectMapper.convertValue(request.getMessageBody(),
                ImageSearchRequest.class);

        String fileId = imageSearchRequest.getFileId();

        FileEntity fileEntity = fileEntityRepository.findById(fileId)
                .orElseThrow(() -> {
                    throw new NotValidFieldException("File not found", new BaseResponse(20007,
                            MessageCode.FILE_NOT_FOUND.getCode(), MessageCode.FILE_NOT_FOUND.getDescription(),
                            Map.of("fileId",fileId)));
                });

//        YandexSearchResponse response = yandexSearchService.searchByFileEntity(fileEntity);

        //TODO uncommited when add billing
//        GoogleVisionSearchResponse googleVisionSearchResponse = googleVisionSearchService.searchByFileEntity(fileId);

        String searchResponseYandex;
        String searchResponseGoogle;
        try {
            searchResponseYandex = searchImageService.searchReverseByPublicUrl(fileEntity, "yandex_reverse_image",
                    "visual_matches");
            searchResponseGoogle = searchImageService.searchReverseByPublicUrl(fileEntity, "google_lens",
                    "exact_matches");
        } catch (TimeoutException e) {
            log.warn("Search timeout for file {}, returning empty results", fileId);
            return new BaseResponse(request.getMsgId(), MessageCode.SUCCESS.getCode(),
                    "Search completed (partial)", Map.of(
                    "results", List.of(),
                    "total", 0,
                    "searchStatus", "timeout"
            ));
        } catch (IOException e) {
            log.error("Search failed for file {}", fileId, e);
            return new BaseResponse(request.getMsgId(), 20007,
                    "Search service temporarily unavailable",
                    Map.of("fileId", fileId));
        }

        tariffInfoService.writeOffTokens(fileEntity.getUserId(), TariffConstants.TOKEN_VALUE_FOR_SEARCH);

        checkCounterService.incrementCheckCount(fileEntity.getUserId(), fileEntity.getMimeType());

        int page = imageSearchRequest.getPage() != null ? imageSearchRequest.getPage() : 1;

        YandexSearchResponse yandexSearchResponse = mapper.mapToYandexResponse(searchResponseYandex, page, 5,
                "visual_matches");
        YandexSearchResponse googleSearchResponse = mapper.mapToYandexResponse(searchResponseGoogle, page, 5,
                "exact_matches");

        int totalSize = yandexSearchResponse.getImages().size() + googleSearchResponse.getImages().size();
        List<YandexSearchResponse.ImageResult> results = new ArrayList<>(totalSize);
        results.addAll(yandexSearchResponse.getImages());
        results.addAll(googleSearchResponse.getImages());

        yandexSearchResponse.setImages(results);
        yandexSearchResponse.setTotalResults(totalSize);

        return new BaseResponse(request.getMsgId(), MessageCode.SUCCESS.getCode(),
                MessageCode.SUCCESS.getDescription(), yandexSearchResponse);
    }
}