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.domain.RefundStatus;
import com.tourguide.modules.order.entity.TourOrder;
import com.tourguide.modules.order.mapper.TourOrderMapper;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
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 HuifuRefundCallbackService {
    private static final DateTimeFormatter TIME_FORMAT = DateTimeFormatter.ofPattern("yyyyMMddHHmmss");

    private final HuiFuProperties properties;
    private final TourOrderMapper orderMapper;

    public HuifuRefundCallbackService(HuiFuProperties properties, TourOrderMapper orderMapper) {
        this.properties = properties;
        this.orderMapper = orderMapper;
    }

    @Transactional
    public boolean handle(JSONObject body) {
        String refundOrderNo = first(body, "req_seq_id", "refund_req_seq_id");
        if (!StringUtils.hasText(refundOrderNo)) {
            throw new BusinessException(400, "Huifu refund callback request sequence is missing");
        }
        validateMerchant(first(body, "huifu_id", "out_huifu_id"));
        TourOrder order = orderMapper.selectByRefundOrderNoForUpdate(refundOrderNo);
        if (order == null) throw new BusinessException(404, "Refund order does not exist");

        String status = first(body, "refund_stat", "trans_stat");
        if (!isSuccess(status)) {
            if (!RefundStatus.REFUNDED.matches(order.getRefundStatus())) {
                order.setRefundStatus(RefundStatus.REFUND_FAILED.getCode());
                orderMapper.updateById(order);
            }
            return false;
        }
        if (RefundStatus.REFUNDED.matches(order.getRefundStatus())) {
            return false;
        }
        BigDecimal callbackAmount = amount(body);
        if (order.getRefundAmount() == null || order.getRefundAmount().compareTo(callbackAmount) != 0) {
            throw new BusinessException(409, "Refund amount does not match order");
        }
        order.setRefundStatus(RefundStatus.REFUNDED.getCode());
        order.setRefundTime(callbackTime(body));
        orderMapper.updateById(order);
        return true;
    }

    private void validateMerchant(String callbackHuifuId) {
        if (!StringUtils.hasText(callbackHuifuId)
                || !callbackHuifuId.equals(properties.getHuifuId())) {
            throw new BusinessException(400, "Huifu refund callback merchant does not match");
        }
    }

    private BigDecimal amount(JSONObject body) {
        String value = first(body, "ord_amt", "refund_amt", "trans_amt");
        if (!StringUtils.hasText(value)) {
            throw new BusinessException(400, "Huifu refund callback amount is missing");
        }
        try {
            return new BigDecimal(value);
        } catch (NumberFormatException exception) {
            throw new BusinessException(400, "Huifu refund callback amount is invalid");
        }
    }

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

    private boolean isSuccess(String status) {
        return "S".equalsIgnoreCase(status) || "SUCCESS".equalsIgnoreCase(status);
    }

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