package com.qmth.ops.biz.service;

import com.qmth.boot.core.ai.model.ocr.OcrType;
import com.qmth.ops.biz.ai.client.OcrApiClient;
import com.qmth.ops.biz.ai.client.OcrApiConfig;
import com.qmth.ops.biz.ai.exception.OcrClientNotFound;
import com.qmth.ops.biz.domain.OcrSupplier;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.List;

@Service
public class OcrClientService {

    private static final Logger log = LoggerFactory.getLogger(OcrClientService.class);

    private OcrApiClient defaultClient;

    @Resource
    private OcrSupplierService ocrSupplierService;

    public synchronized void init() {
        //取第一个prior的为默认客户端，没有则取第一个
        defaultClient = null;
        List<OcrSupplier> list = ocrSupplierService.list();
        if (!list.isEmpty()) {
            initApiClient(list.stream().filter(OcrSupplier::getPrior).findFirst().orElse(list.get(0)));
        }
    }

    private void initApiClient(OcrSupplier supplier) {
        try {
            String className = OcrApiClient.class.getName().replace("OcrApiClient", supplier.getClientClass());
            OcrApiConfig config = new OcrApiConfig(supplier);
            Class<?> clientClass = Class.forName(className);
            OcrApiClient client = (OcrApiClient) clientClass.getConstructor(OcrApiConfig.class).newInstance(config);
            if (defaultClient == null) {
                defaultClient = client;
            }
        } catch (Exception e) {
            log.error("OCR api client init error, supplier={}, class={}", supplier.getName(),
                    supplier.getClientClass());
        }
    }

    public String forImage(OcrType type, byte[] imageData) throws Exception {
        if (defaultClient == null) {
            throw new OcrClientNotFound(type);
        }
        return defaultClient.forImage(type, imageData);
    }
}