package com.tourguide.modules.order.service;

import com.alibaba.fastjson.JSONObject;
import com.tourguide.common.exception.BusinessException;
import com.tourguide.common.huifu.properties.HuiFuProperties;
import com.tourguide.modules.order.payment.HuifuPaymentNotice;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeParseException;

@Service
public class HuifuPaymentCallbackService {
    private static final Logger log = LoggerFactory.getLogger(HuifuPaymentCallbackService.class);
    private static final DateTimeFormatter PAYMENT_TIME_FORMAT = DateTimeFormatter.ofPattern("yyyyMMddHHmmss");

    private final HuiFuProperties properties;
    private final TourOrderPaymentService orderPaymentService;

    public HuifuPaymentCallbackService(HuiFuProperties properties,
                                       TourOrderPaymentService orderPaymentService) {
        this.properties = properties;
        this.orderPaymentService = orderPaymentService;
    }

    public void handle(JSONObject body) {
        String reqSeqId = first(body, "req_seq_id", "org_req_seq_id");
        if (!StringUtils.hasText(reqSeqId)) throw new BusinessException(400, "汇付回调缺少请求流水号");
        String callbackHuifuId = first(body, "huifu_id", "out_huifu_id");
        validateMerchant(callbackHuifuId);
        String transactionStatus = body.getString("trans_stat");
        if (!"S".equals(transactionStatus)) {
            log.info("汇付支付回调非成功状态，reqSeqId={}，transStat={}", reqSeqId, transactionStatus);
            return;
        }
        BigDecimal amount = amount(body);
        HuifuPaymentNotice notice = new HuifuPaymentNotice(reqSeqId, callbackHuifuId,
                transactionStatus, amount,
                first(body, "hf_seq_id", "out_trans_id", "transaction_id"),
                paymentTime(body));
        boolean confirmed = orderPaymentService.confirm(notice);
        log.info("汇付支付回调处理完成，reqSeqId={}，首次确认={}，providerTransactionId={}",
                reqSeqId, confirmed, notice.getProviderTransactionId());
    }

    private void validateMerchant(String callbackHuifuId) {
        if (!StringUtils.hasText(callbackHuifuId)) {
            throw new BusinessException(400, "汇付回调缺少商户号");
        }
        if (!StringUtils.hasText(properties.getHuifuId())
                || !properties.getHuifuId().equals(callbackHuifuId)) {
            throw new BusinessException(400, "汇付回调商户号不匹配");
        }
    }

    private BigDecimal amount(JSONObject body) {
        String value = first(body, "trans_amt", "ord_amt", "pay_amt");
        if (!StringUtils.hasText(value)) throw new BusinessException(400, "汇付回调缺少支付金额");
        try {
            return new BigDecimal(value);
        } catch (NumberFormatException exception) {
            throw new BusinessException(400, "汇付回调支付金额格式错误");
        }
    }

    private LocalDateTime paymentTime(JSONObject body) {
        String value = first(body, "end_time", "trans_time", "pay_time");
        if (!StringUtils.hasText(value)) return LocalDateTime.now();
        String normalized = value.replace("-", "").replace(":", "").replace(" ", "");
        try {
            return LocalDateTime.parse(normalized, PAYMENT_TIME_FORMAT);
        } catch (DateTimeParseException exception) {
            return LocalDateTime.now();
        }
    }

    private String first(JSONObject body, String... keys) {
        for (String key : keys) {
            String value = body.getString(key);
            if (StringUtils.hasText(value)) return value;
        }
        return null;
    }
}