package com.xxx.app.service.impl;

import cn.hutool.core.lang.Assert;
import cn.hutool.core.thread.ThreadUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.http.HttpUtil;
import cn.hutool.json.JSONUtil;
import com.pisen.yunma2.server.service.IpInfoService;
import com.pisen.yunma2.server.vo.IPInfo;
import lombok.extern.slf4j.Slf4j;
import org.jetbrains.annotations.Nullable;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.TimeUnit;
import java.util.function.Function;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * @author: fanxian
 * @Date: 2024/10/22 15:13
 **/
@Slf4j
@Service
public class IpInfoServiceImpl implements IpInfoService {
    @Override
    public IPInfo ipInfo(String ip) {
        IPInfo ipInfo = new IPInfo(ip);
        CompletableFuture.anyOf(
                CompletableFuture.supplyAsync(()->fetchCountryCode(StrUtil.format("https://ipapi.com/ip_api.php?ip={}", ip), e->extractField(e, "country_code")))
                        .thenAccept(cCode -> ipInfo.setCountryCode(cCode)),
                CompletableFuture.supplyAsync(()->fetchCountryCode(StrUtil.format("https://webapi-pc.meitu.com/common/ip_location?ip={}", ip), e->extractField(e, "nation_code")))
                        .thenAccept(cCode -> ipInfo.setCountryCode(cCode)),
                CompletableFuture.supplyAsync(()->fetchCountryCode(StrUtil.format("https://ip-api.io/json/{}", ip), e->extractField(e, "country_code")))
                        .thenAccept(cCode -> ipInfo.setCountryCode(cCode)),
                CompletableFuture.supplyAsync(()->fetchCountryCode(StrUtil.format("https://api.ipapi.is/?ip={}", ip), e->extractField(e, "country_code")))
                        .thenAccept(cCode -> ipInfo.setCountryCode(cCode))
        ).join();
        return ipInfo;
    }


    private static Integer TIMEOUT = 1000;
    public String fetchCountryCode(String url, Function<String,String> extractField) {
        try {
            log.info("fetching {}", url);
            String resStr = HttpUtil.get(url, TIMEOUT);
            String countryCode = extractField.apply(resStr);
            Assert.notBlank(countryCode);
            log.info("resp {} country code: {}", url, countryCode);
            return countryCode.toUpperCase();
        }catch (Exception e){
            log.error("failed url: {}, error: {}", url, e.getMessage());
            ThreadUtil.sleep(TIMEOUT+300, TimeUnit.MILLISECONDS); // 停一下，讓其他請(qǐng)求成功返回
            return null;
        }
    }
    private static @Nullable String extractField(String resStr, String fieldName) {
        String regex = "\""+fieldName+"\":\\s*\"([^\"]*)\"";
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(resStr);

        if (matcher.find()) {
            String nationCode = matcher.group(1);
            System.out.println("extract field... " + fieldName +": " + nationCode);
            return nationCode;
        } else {
            System.out.println(fieldName +" not found.");
            return null;
        }
    }


    public static void main(String[] args) throws IOException {

//        String ip = "172.66.43.8"; // not china
        String ip = "121.8.215.106"; // china
        IpInfoServiceImpl ipInfoService = new IpInfoServiceImpl();
        IPInfo ipInfo = ipInfoService.ipInfo(ip);
        System.out.println("--->ipInfo: " + JSONUtil.toJsonStr(ipInfo));
    }

}