package com.tourguide.modules.order.payment;

import com.alibaba.fastjson.JSONObject;
import com.tourguide.common.huifu.biz.DouGongRefundBiz;
import com.tourguide.modules.order.entity.TourOrder;
import com.tourguide.modules.order.entity.TourOrderPaymentAttempt;
import com.tourguide.modules.order.mapper.TourOrderPaymentAttemptMapper;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;

import java.math.BigDecimal;
import java.util.Map;

@Component
public class HuifuPaymentRefundGateway implements PaymentRefundGateway {
    private static final String SUCCESS_CODE = "00000100";

    private final DouGongRefundBiz refundBiz;
    private final TourOrderPaymentAttemptMapper paymentAttemptMapper;

    public HuifuPaymentRefundGateway(DouGongRefundBiz refundBiz,
                                     TourOrderPaymentAttemptMapper paymentAttemptMapper) {
        this.refundBiz = refundBiz;
        this.paymentAttemptMapper = paymentAttemptMapper;
    }

    @Override
    public String refund(TourOrder order, BigDecimal amount) {
        if (!StringUtils.hasText(order.getRefundOrderNo())) {
            throw new IllegalStateException("Refund request sequence is missing");
        }
        if (!StringUtils.hasText(order.getPaymentOrderNo())) {
            throw new IllegalStateException("Original payment sequence is missing");
        }
        TourOrderPaymentAttempt paymentAttempt = paymentAttemptMapper
                .selectByReqSeqIdForUpdate(order.getPaymentOrderNo());
        if (paymentAttempt == null || !StringUtils.hasText(paymentAttempt.getReqDate())) {
            throw new IllegalStateException("Original payment attempt is missing");
        }
        try {
            Map<String, Object> response = refundBiz.refund(order.getRefundOrderNo(), amount,
                    paymentAttempt.getReqDate(), paymentAttempt.getReqSeqId());
            String responseCode = responseValue(response, "resp_code", "code");
            if (!SUCCESS_CODE.equals(responseCode)) {
                String description = responseValue(response, "resp_desc", "msg");
                throw new IllegalStateException(StringUtils.hasText(description)
                        ? description : "Huifu refund request failed");
            }
            return order.getRefundOrderNo();
        } catch (RuntimeException exception) {
            throw exception;
        } catch (Exception exception) {
            throw new IllegalStateException("Huifu refund service unavailable", exception);
        }
    }

    private String stringValue(Object value) {
        return value == null ? null : String.valueOf(value);
    }

    private String responseValue(Map<String, Object> response, String... keys) {
        if (response == null) return null;
        for (String key : keys) {
            String value = stringValue(response.get(key));
            if (StringUtils.hasText(value)) return value;
        }
        for (String nestedKey : new String[]{"data", "resp_data"}) {
            Object nested = response.get(nestedKey);
            if (nested instanceof Map) {
                @SuppressWarnings("unchecked")
                Map<String, Object> nestedMap = (Map<String, Object>) nested;
                String value = responseValue(nestedMap, keys);
                if (StringUtils.hasText(value)) return value;
            } else if (nested instanceof String && StringUtils.hasText((String) nested)) {
                try {
                    String value = responseValue(JSONObject.parseObject((String) nested), keys);
                    if (StringUtils.hasText(value)) return value;
                } catch (RuntimeException ignored) {
                }
            }
        }
        return null;
    }
}