package com.tourguide.modules.order.service;

import com.tourguide.common.huifu.RequestSeqUtil;
import com.tourguide.modules.order.domain.OrderStatus;
import com.tourguide.modules.order.domain.PaymentMethod;
import com.tourguide.modules.order.domain.RefundAmountCalculator;
import com.tourguide.modules.order.domain.RefundStatus;
import com.tourguide.modules.order.entity.TourOrder;
import com.tourguide.modules.order.mapper.TourOrderMapper;
import com.tourguide.modules.order.payment.PaymentRefundGateway;
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;

@Service
public class OrderRefundService {
    private static final Logger log = LoggerFactory.getLogger(OrderRefundService.class);

    private final TourOrderMapper orderMapper;
    private final PaymentRefundGateway paymentRefundGateway;

    public OrderRefundService(TourOrderMapper orderMapper, PaymentRefundGateway paymentRefundGateway) {
        this.orderMapper = orderMapper;
        this.paymentRefundGateway = paymentRefundGateway;
    }

    public boolean requestRefund(TourOrder order) {
        if (order == null) return false;
        BigDecimal refundAmount = RefundAmountCalculator.refundableAmount(order);
        return requestRefund(order, refundAmount);
    }

    public boolean requestRefund(TourOrder order, BigDecimal refundAmount) {
        if (order == null || order.getPaymentTime() == null) {
            return false;
        }
        if (RefundStatus.REFUNDED.matches(order.getRefundStatus())
                || OrderStatus.REFUNDED.matches(order.getStatus())) {
            return true;
        }
        if (RefundStatus.REFUNDING.matches(order.getRefundStatus())
                && StringUtils.hasText(order.getRefundOrderNo())) {
            return true;
        }
        if (refundAmount == null || refundAmount.compareTo(BigDecimal.ZERO) <= 0) {
            return false;
        }
        BigDecimal refundableAmount = RefundAmountCalculator.refundableAmount(order);
        if (refundAmount.compareTo(refundableAmount) > 0) {
            return false;
        }
        order.setRefundOrderNo(RequestSeqUtil.generateForBusiness("RF"));
        order.setRefundStatus(RefundStatus.REFUNDING.getCode());
        order.setRefundAmount(refundAmount);
        order.setRefundMethod(order.getPaymentMethod());
        if (PaymentMethod.TEMPORARY_BYPASS.matches(order.getPaymentMethod())) {
            if (order.getCancelledAt() == null) order.setCancelledAt(LocalDateTime.now());
            completeLocalRefund(order, refundAmount);
            order.setRefundTime(LocalDateTime.now());
            orderMapper.updateById(order);
            return true;
        }
        orderMapper.updateById(order);
        try {
            String refundRequestNo = paymentRefundGateway.refund(order, refundAmount);
            if (!StringUtils.hasText(refundRequestNo)) {
                throw new IllegalStateException("Payment provider did not accept refund request");
            }
            if (!OrderStatus.CANCELLED.matches(order.getStatus())) {
                order.setStatus(OrderStatus.CANCELLED.getCode());
            }
            if (order.getCancelledAt() == null) order.setCancelledAt(LocalDateTime.now());
            orderMapper.updateById(order);
            return true;
        } catch (RuntimeException exception) {
            order.setRefundStatus(RefundStatus.REFUND_FAILED.getCode());
            orderMapper.updateById(order);
            log.error("Order refund request failed, orderId={}, orderNo={}, refundOrderNo={}",
                    order.getId(), order.getOrderNo(), order.getRefundOrderNo(), exception);
            return false;
        }
    }

    private void completeLocalRefund(TourOrder order, BigDecimal refundAmount) {
        BigDecimal refundedAmount = RefundAmountCalculator.refundedAmount(order).add(refundAmount);
        order.setRefundedAmount(refundedAmount);
        if (refundedAmount.compareTo(RefundAmountCalculator.paidAmount(order)) >= 0) {
            order.setRefundStatus(RefundStatus.REFUNDED.getCode());
            order.setStatus(OrderStatus.REFUNDED.getCode());
        } else {
            order.setRefundStatus(RefundStatus.PARTIAL.getCode());
            order.setStatus(OrderStatus.CANCELLED.getCode());
        }
    }
}