package com.ruoyi.purchase.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.ruoyi.common.exception.base.BaseException;
import com.ruoyi.common.utils.DateUtils;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.common.utils.bean.BeanUtils;
import com.ruoyi.other.mapper.TempFileMapper;
import com.ruoyi.other.pojo.TempFile;
import com.ruoyi.purchase.dto.TicketRegistrationDto;
import com.ruoyi.purchase.mapper.ProductRecordMapper;
import com.ruoyi.purchase.mapper.PurchaseLedgerMapper;
import com.ruoyi.purchase.mapper.TicketRegistrationMapper;
import com.ruoyi.purchase.pojo.ProductRecord;
import com.ruoyi.purchase.pojo.PurchaseLedger;
import com.ruoyi.purchase.pojo.TicketRegistration;
import com.ruoyi.purchase.service.ITicketRegistrationService;
import com.ruoyi.sales.mapper.CommonFileMapper;
import com.ruoyi.sales.mapper.SalesLedgerProductMapper;
import com.ruoyi.sales.pojo.CommonFile;
import com.ruoyi.sales.pojo.SalesLedgerProduct;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.io.FilenameUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.io.IOException;
import java.math.BigDecimal;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import java.util.stream.Collectors;

/**
 * 来票登记Service业务层处理
 *
 * @author ruoyi
 * @date 2025-05-13
 */
@Service
@RequiredArgsConstructor
@Slf4j
public class TicketRegistrationServiceImpl extends ServiceImpl<TicketRegistrationMapper, TicketRegistration> implements ITicketRegistrationService {

    private final TicketRegistrationMapper ticketRegistrationMapper;

    private final PurchaseLedgerMapper purchaseLedgerMapper;

    private final SalesLedgerProductMapper salesLedgerProductMapper;

    private final CommonFileMapper commonFileMapper;

    private final TempFileMapper tempFileMapper;

    private final ProductRecordMapper productRecordMapper;

    @Value("${file.upload-dir}")
    private String uploadDir;


    @Override
    public List<TicketRegistration> selectTicketRegistrationList(TicketRegistration ticketRegistration) {
        LambdaQueryWrapper<TicketRegistration> queryWrapper = new LambdaQueryWrapper<>();
        if (StringUtils.isNotBlank(ticketRegistration.getPurchaseContractNumber())) {
            queryWrapper.like(TicketRegistration::getPurchaseContractNumber, ticketRegistration.getPurchaseContractNumber())
                    .like(TicketRegistration::getSupplierName, ticketRegistration.getSupplierName())
                    .eq(TicketRegistration::getIssueDate, ticketRegistration.getIssueDate());
        }
        return ticketRegistrationMapper.selectList(queryWrapper);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public int addOrUpdateRegistration(TicketRegistrationDto ticketRegistrationDto) throws IOException {
        // 1. 查询采购台账记录
        PurchaseLedger purchaseLedger = purchaseLedgerMapper.selectById(ticketRegistrationDto.getPurchaseLedgerId());
        if (purchaseLedger == null) {
            // 处理采购台账不存在的情况，例如抛出异常或返回错误
            throw new IllegalArgumentException("采购台账记录不存在，ID: " + ticketRegistrationDto.getPurchaseLedgerId());
        }

        // 3. 创建或更新票据登记实体
        TicketRegistration ticketRegistration = new TicketRegistration();
        BeanUtils.copyProperties(ticketRegistrationDto, ticketRegistration);
        ticketRegistration.setPurchaseContractNumber(purchaseLedger.getPurchaseContractNumber());
        ticketRegistration.setTenantId(purchaseLedger.getTenantId());
        ticketRegistration.setContractAmount(purchaseLedger.getContractAmount());
        ticketRegistration.setSalesLedgerId(purchaseLedger.getSalesLedgerId());

        // 4. 处理子表数据
        List<SalesLedgerProduct> productData = ticketRegistrationDto.getProductData();
        if (CollectionUtils.isNotEmpty(productData)) {
            handleSalesLedgerProducts(purchaseLedger.getId(), productData, 2);
        }

        // 5. 执行插入或更新操作
        int rowsAffected = ticketRegistrationMapper.insert(ticketRegistration);

        // 6. 增加采购台账产品开票记录
        List<SalesLedgerProduct> salesLedgerProducts = ticketRegistrationDto.getProductData();
        if (CollectionUtils.isNotEmpty(salesLedgerProducts)){
            for (SalesLedgerProduct salesLedgerProduct : salesLedgerProducts) {
                ProductRecord productRecord = new ProductRecord();
                productRecord.setTicketRegistrationId(ticketRegistration.getId());
                productRecord.setPurchaseLedgerId(ticketRegistrationDto.getPurchaseLedgerId());
                productRecord.setCreatedAt(DateUtils.getNowDate());
                BeanUtils.copyProperties(salesLedgerProduct,productRecord);
                productRecord.setId(null);
                productRecord.setType("2");
                productRecordMapper.insert(productRecord);
            }
        }
        // 迁移临时文件到正式目录
        if (ticketRegistrationDto.getTempFileIds() != null && !ticketRegistrationDto.getTempFileIds().isEmpty()) {
            migrateTempFilesToFormal(ticketRegistration.getId(), ticketRegistrationDto.getTempFileIds());
        }
        return rowsAffected;
    }


    /**
     * 将临时文件迁移到正式目录
     *
     * @param businessId  业务ID（销售台账ID）
     * @param tempFileIds 临时文件ID列表
     * @throws IOException 文件操作异常
     */
    private void migrateTempFilesToFormal(Long businessId, List<String> tempFileIds) throws IOException {
        if (CollectionUtils.isEmpty(tempFileIds)) {
            return;
        }

        // 构建正式目录路径（按业务类型和日期分组）
        String formalDir = uploadDir + LocalDate.now().format(DateTimeFormatter.ISO_LOCAL_DATE);

        Path formalDirPath = Paths.get(formalDir);

        // 确保正式目录存在（递归创建）
        if (!Files.exists(formalDirPath)) {
            Files.createDirectories(formalDirPath);
        }

        for (String tempFileId : tempFileIds) {
            // 查询临时文件记录
            TempFile tempFile = tempFileMapper.selectById(tempFileId);
            if (tempFile == null) {
                log.warn("临时文件不存在，跳过处理: {}", tempFileId);
                continue;
            }

            // 构建正式文件名（包含业务ID和时间戳，避免冲突）
            String originalFilename = tempFile.getOriginalName();
            String fileExtension = FilenameUtils.getExtension(originalFilename);
            String formalFilename = businessId + "_" +
                    System.currentTimeMillis() + "_" +
                    UUID.randomUUID().toString().substring(0, 8) +
                    (com.ruoyi.common.utils.StringUtils.hasText(fileExtension) ? "." + fileExtension : "");

            Path formalFilePath = formalDirPath.resolve(formalFilename);

            try {
                // 执行文件迁移（使用原子操作确保安全性）
                Files.move(
                        Paths.get(tempFile.getTempPath()),
                        formalFilePath,
                        StandardCopyOption.REPLACE_EXISTING,
                        StandardCopyOption.ATOMIC_MOVE
                );
                log.info("文件迁移成功: {} -> {}", tempFile.getTempPath(), formalFilePath);

                // 更新文件记录（关联到业务ID）
                CommonFile fileRecord = new CommonFile();
                fileRecord.setCommonId(businessId);
                fileRecord.setName(originalFilename);
                fileRecord.setUrl(formalFilePath.toString());
                fileRecord.setCreateTime(LocalDateTime.now());
                fileRecord.setType(tempFile.getType());
                commonFileMapper.insert(fileRecord);

                log.info("文件迁移成功: {} -> {}", tempFile.getTempPath(), formalFilePath);
            } catch (IOException e) {
                log.error("文件迁移失败: {}", tempFile.getTempPath(), e);
                // 可选择回滚事务或记录失败文件
                throw new IOException("文件迁移异常", e);
            }
        }
    }


    @Override
    public int delRegistration(Long[] ids) {
        return ticketRegistrationMapper.deleteBatchIds(Arrays.asList(ids));
    }

    @Override
    public TicketRegistrationDto getRegistrationById(TicketRegistrationDto ticketRegistrationDto) {
        TicketRegistration ticketRegistration = ticketRegistrationMapper.selectById(ticketRegistrationDto.getId());
        LambdaQueryWrapper<PurchaseLedger> purchaseQueryWrapper = new LambdaQueryWrapper<>();
        purchaseQueryWrapper.eq(PurchaseLedger::getId, ticketRegistration.getPurchaseLedgerId());
        PurchaseLedger purchaseLedger = purchaseLedgerMapper.selectOne(purchaseQueryWrapper);
        if (ticketRegistration == null) {
            throw new BaseException("采购台账不存在");
        }
        // 创建并填充DTO
        TicketRegistrationDto resultDto = new TicketRegistrationDto();
        BeanUtils.copyProperties(ticketRegistration, resultDto);

        // 查询并设置关联产品
        LambdaQueryWrapper<SalesLedgerProduct> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(SalesLedgerProduct::getSalesLedgerId, purchaseLedger.getId())
                .eq(SalesLedgerProduct::getType, 2);
        List<SalesLedgerProduct> productList = salesLedgerProductMapper.selectList(queryWrapper);
        resultDto.setProductData(productList);
        return resultDto;
    }

    @Override
    public List getTicketNo(TicketRegistrationDto ticketRegistrationDto) {
        LambdaQueryWrapper<TicketRegistration> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.select(TicketRegistration::getId,TicketRegistration::getInvoiceNumber,TicketRegistration::getInvoiceAmount)
                .eq(TicketRegistration::getPurchaseLedgerId,ticketRegistrationDto.getId());
        List<Map<String, Object>> result = ticketRegistrationMapper.selectMaps(queryWrapper);
        // 将下划线命名转换为驼峰命名
        return result.stream().map(map -> map.entrySet().stream()
                .collect(Collectors.toMap(
                        entry -> underlineToCamel(entry.getKey()),
                        Map.Entry::getValue))
        ).collect(Collectors.toList());
    }

    private void handleSalesLedgerProducts(Long salesLedgerId, List<SalesLedgerProduct> products, Integer type) {
        if (products == null || products.isEmpty()) {
            return;
        }

        // 过滤出有 ID 的记录（即需要更新的记录）
        List<SalesLedgerProduct> updateList = products.stream()
                .filter(p -> p.getId() != null)
                .peek(p -> {
                    p.setSalesLedgerId(salesLedgerId);
                    p.setType(type);
                })
                .collect(Collectors.toList());

        // 批量更新（需要 MyBatis 提供批量更新方法）
        if (!updateList.isEmpty()) {
            updateList.forEach(product -> {
                // 非空校验，任一字段为空则抛出异常
                if (product.getQuantity() == null) {
                    throw new BaseException("数量不能为空");
                }
                if (product.getTicketsNum() == null) {
                    throw new BaseException("已开票数量不能为空");
                }
                if (product.getTaxInclusiveTotalPrice() == null) {
                    throw new BaseException("含税总价不能为空");
                }
                if (product.getTicketsAmount() == null) {
                    throw new BaseException("本次来票金额(元)不能为空");
                }

                // 计算 futureTickets（直接使用 BigDecimal 计算，避免精度丢失）
                product.setFutureTickets(
                        product.getQuantity()
                                .subtract(BigDecimal.valueOf(product.getTicketsNum()))
                                .longValueExact() // 使用 exact 方法确保无小数部分
                );

                // 计算 futureTicketsAmount
                product.setFutureTicketsAmount(
                        product.getTaxInclusiveTotalPrice()
                                .subtract(product.getTicketsAmount())
                );
                product.setType(type);
                salesLedgerProductMapper.updateById(product);
            });
        }
    }

    /**
     * 下划线命名转驼峰命名
     */
    private String underlineToCamel(String param) {
        if (param == null || "".equals(param.trim())) {
            return "";
        }
        int len = param.length();
        StringBuilder sb = new StringBuilder(len);
        for (int i = 0; i < len; i++) {
            char c = param.charAt(i);
            if (c == '_') {
                if (++i < len) {
                    sb.append(Character.toUpperCase(param.charAt(i)));
                }
            } else {
                sb.append(Character.toLowerCase(c));
            }
        }
        return sb.toString();
    }
}