package com.ruoyi.sales.service.impl;

import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.ruoyi.other.mapper.TempFileMapper;
import com.ruoyi.other.pojo.TempFile;
import com.ruoyi.sales.mapper.CommonFileMapper;
import com.ruoyi.sales.pojo.CommonFile;
import com.ruoyi.sales.service.ICommonFileService;
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 org.springframework.web.multipart.MultipartFile;

import java.io.IOException;
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.UUID;

@Service
@RequiredArgsConstructor
@Slf4j
public class CommonFileServiceImpl extends ServiceImpl<CommonFileMapper, CommonFile> implements ICommonFileService {

    private final CommonFileMapper commonFileMapper;

    private final TempFileMapper tempFileMapper;

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


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

    @Override
    public CommonFile uploadFile(MultipartFile file, Long id, String type) throws IOException {
        // 1. 生成正式文件ID和路径
        String tempId = UUID.randomUUID().toString();
        Path tempFilePath = Paths.get(uploadDir, tempId + "_" + file.getOriginalFilename());

        // 2. 确保目录存在
        Path parentDir = tempFilePath.getParent();
        if (parentDir != null) {
            Files.createDirectories(parentDir); // 递归创建目录
        }

        // 3. 保存文件到目录
        file.transferTo(tempFilePath.toFile());

        // 4. 保存文件记录
        CommonFile commonFile = new CommonFile();
        commonFile.setCommonId(id);
        commonFile.setName(file.getOriginalFilename());
        commonFile.setUrl(tempFilePath.toString());
        commonFile.setType(type);
        commonFileMapper.insert(commonFile);
        return commonFile;
    }

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

    /**
     * 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
     */
    @Transactional(rollbackFor = Exception.class)
    public 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);
            }
        }
    }
}