package com.ruoyi.account.service.impl.purchase;

import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.github.xiaoymin.knife4j.core.util.CollectionUtils;
import com.ruoyi.account.bean.dto.purchase.AccountPurchasePaymentDto;
import com.ruoyi.account.bean.vo.purchase.AccountPurchasePaymentVo;
import com.ruoyi.account.mapper.AccountStatementDetailsMapper;
import com.ruoyi.account.mapper.purchase.AccountPaymentApplicationMapper;
import com.ruoyi.account.mapper.purchase.AccountPurchasePaymentMapper;
import com.ruoyi.account.pojo.AccountStatementDetails;
import com.ruoyi.account.pojo.purchase.AccountPaymentApplication;
import com.ruoyi.account.pojo.purchase.AccountPurchasePayment;
import com.ruoyi.account.service.purchase.AccountPurchasePaymentService;
import com.ruoyi.common.exception.ServiceException;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.common.utils.poi.ExcelUtil;
import jakarta.servlet.http.HttpServletResponse;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.List;
import java.util.Random;

/**
 * <p>
 * 财务管理--付款单 服务实现类
 * </p>
 *
 * @author 芯导软件（江苏）有限公司
 * @since 2026-05-19 04:14:51
 */
@Service
@RequiredArgsConstructor
public class AccountPurchasePaymentServiceImpl extends ServiceImpl<AccountPurchasePaymentMapper, AccountPurchasePayment> implements AccountPurchasePaymentService {

    private static final DateTimeFormatter CODE_TIME_FORMATTER = DateTimeFormatter.ofPattern("yyMMddHHmmss");
    private final AccountPurchasePaymentMapper accountPurchasePaymentMapper;
    private final AccountStatementDetailsMapper accountStatementDetailsMapper;
    private final AccountPaymentApplicationMapper accountPaymentApplicationMapper;

    @Override
    public IPage<AccountPurchasePaymentVo> listPageAccountPurchasePayment(Page page, AccountPurchasePaymentDto accountPurchasePaymentDto) {
        return accountPurchasePaymentMapper.listPageAccountPurchasePayment(page, accountPurchasePaymentDto);
    }

    @Override
    public boolean addAccountPurchasePayment(AccountPurchasePayment accountPurchasePayment) {
        if (StringUtils.isEmpty(accountPurchasePayment.getPaymentNumber())) {
            accountPurchasePayment.setPaymentNumber(genAccountPurchasePaymentNo());
        }
        //校验付款申请是否存在且审核通过
        AccountPaymentApplication accountPaymentApplication = accountPaymentApplicationMapper.selectById(accountPurchasePayment.getAccountPaymentApplicationId());
        if (accountPaymentApplication == null) {
            throw new ServiceException("付款申请不存在");
        }
        if (accountPaymentApplication.getStatus() == null || accountPaymentApplication.getStatus() != 1) {
            throw new ServiceException("付款申请未审核通过，不能付款");
        }
        //校验累计付款金额不能超过申请金额
        List<AccountPurchasePayment> accountPurchasePayments = accountPurchasePaymentMapper.selectList(
                Wrappers.<AccountPurchasePayment>lambdaQuery()
                        .eq(AccountPurchasePayment::getAccountPaymentApplicationId, accountPurchasePayment.getAccountPaymentApplicationId()));
        BigDecimal totalPaymentAmount = accountPurchasePayments.stream()
                .map(AccountPurchasePayment::getPaymentAmount)
                .reduce(BigDecimal.ZERO, BigDecimal::add);
        BigDecimal newTotal = totalPaymentAmount.add(accountPurchasePayment.getPaymentAmount());
        if (newTotal.compareTo(accountPaymentApplication.getPaymentAmount()) > 0) {
            throw new ServiceException("累计付款金额不能超过申请金额");
        }
        boolean result = save(accountPurchasePayment);
        // 更新付款申请的付款状态
        if (result) {
            updatePaymentStatus(accountPaymentApplication, newTotal);
        }
        return result;
    }

    @Override
    public void exportAccountPurchasePayment(HttpServletResponse response, AccountPurchasePaymentDto accountPurchasePaymentDto) {
        List<AccountPurchasePaymentVo> list = accountPurchasePaymentMapper.listPageAccountPurchasePayment(new Page(1,-1),accountPurchasePaymentDto).getRecords();
        ExcelUtil<AccountPurchasePaymentVo> util = new ExcelUtil<>(AccountPurchasePaymentVo.class);
        util.exportExcel(response, list , "付款单");
    }

    @Override
    public boolean deleteAccountPurchasePayment(List<Long> ids) {
        if (CollectionUtils.isEmpty(ids)) {
            return false;
        }
        //如果该付款单已经生成对账单则无法删除
        List<AccountPurchasePayment> accountPurchasePayments = accountPurchasePaymentMapper.selectByIds(ids);
        List<String> strings = accountPurchasePayments.stream().map(AccountPurchasePayment::getPaymentNumber).toList();
        List<AccountStatementDetails> accountStatementDetails = accountStatementDetailsMapper.selectList(Wrappers.<AccountStatementDetails>lambdaQuery()
                .in(AccountStatementDetails::getReceiptNumber, strings));
        if (CollectionUtils.isNotEmpty(accountStatementDetails)){
            throw new ServiceException("该付款单已经生成对账单，无法删除");
        }
        boolean result = removeByIds(ids);
        // 删除成功后，更新付款申请的付款状态
        if (result) {
            for (AccountPurchasePayment payment : accountPurchasePayments) {
                if (payment.getAccountPaymentApplicationId() != null) {
                    AccountPaymentApplication application = accountPaymentApplicationMapper.selectById(payment.getAccountPaymentApplicationId());
                    if (application != null) {
                        // 计算剩余付款金额
                        List<AccountPurchasePayment> remainingPayments = accountPurchasePaymentMapper.selectList(
                                Wrappers.<AccountPurchasePayment>lambdaQuery()
                                        .eq(AccountPurchasePayment::getAccountPaymentApplicationId, application.getId()));
                        BigDecimal remainingAmount = remainingPayments.stream()
                                .map(AccountPurchasePayment::getPaymentAmount)
                                .reduce(BigDecimal.ZERO, BigDecimal::add);
                        updatePaymentStatus(application, remainingAmount);
                    }
                }
            }
        }
        return result;
    }

    /**
     * 更新付款申请的付款状态
     * @param application 付款申请
     * @param paidAmount 已付款金额
     */
    private void updatePaymentStatus(AccountPaymentApplication application, BigDecimal paidAmount) {
        BigDecimal applyAmount = application.getPaymentAmount();
        int newPaymentStatus;
        if (paidAmount.compareTo(BigDecimal.ZERO) == 0) {
            newPaymentStatus = 0; // 未付款
        } else if (paidAmount.compareTo(applyAmount) < 0) {
            newPaymentStatus = 1; // 部分付款
        } else {
            newPaymentStatus = 2; // 已付款
        }
        if (application.getPaymentStatus() == null || application.getPaymentStatus() != newPaymentStatus) {
            application.setPaymentStatus(newPaymentStatus);
            accountPaymentApplicationMapper.updateById(application);
        }
    }

    private String genAccountPurchasePaymentNo() {
        return "SK" + LocalDateTime.now().format(CODE_TIME_FORMATTER) + new Random().nextInt(10);
    }
}