// Code scaffolded by goctl. Safe to edit.
// goctl 1.10.2

package systemlog

import (
	"archive/zip"
	"context"
	"fmt"
	"io"
	"net/http"
	"os"
	"path/filepath"

	"udeServer/internal/apierr"
	"udeServer/internal/log"
	"udeServer/internal/svc"
	"udeServer/internal/types"

	"github.com/zeromicro/go-zero/core/logx"
)

type LogArchiveDownloadLogic struct {
	logx.Logger
	ctx    context.Context
	svcCtx *svc.ServiceContext
}

// 归档打包下载(zip)
func NewLogArchiveDownloadLogic(ctx context.Context, svcCtx *svc.ServiceContext) *LogArchiveDownloadLogic {
	return &LogArchiveDownloadLogic{
		Logger: logx.WithContext(ctx),
		ctx:    ctx,
		svcCtx: svcCtx,
	}
}

// LogArchiveDownload streams the selected archive files back as one zip.
// The response is written to w directly (no unified envelope); the handler
// therefore must not call httpx.OkJsonCtx afterwards.
func (l *LogArchiveDownloadLogic) LogArchiveDownload(w http.ResponseWriter, req *types.LogArchiveDownloadReq) error {
	if len(req.Ids) == 0 {
		return apierr.BadRequest("ids 不能为空")
	}
	if l.svcCtx.MinioClient == nil {
		return apierr.New(500, "MinIO客户端未加载,无法下载归档(检查t_config的file_*配置)")
	}

	log.RecordDebug(l.ctx, "开始下载Ids:%+v的归档!", req.Ids)

	list, err := l.svcCtx.LogArchiveRecordModel.FindByIds(l.ctx, req.Ids)
	if err != nil {
		log.RecordError(l.ctx, err)
		return apierr.New(500, "查询归档记录失败")
	}
	if len(list) == 0 {
		return apierr.New(404, "归档记录不存在")
	}

	w.Header().Set("Content-Type", "application/zip")
	w.Header().Set("Content-Disposition", "attachment; filename=archives.zip")

	zipWriter := zip.NewWriter(w)
	defer func() {
		_ = zipWriter.Close()
	}()

	for i := range list {
		v := &list[i]
		filePath, err := l.svcCtx.MinioClient.DownloadFile(l.ctx, v.ArchiveFileKey)
		if err != nil || filePath == "" {
			log.RecordError(l.ctx, fmt.Errorf("下载归档文件失败[ID:%d]: %v", v.Id, err))
			return apierr.New(500, "下载归档文件失败")
		}
		if err := copyArchiveIntoZip(zipWriter, filePath, v.ArchiveFileKey); err != nil {
			log.RecordError(l.ctx, err)
		}
	}

	log.RecordDebug(l.ctx, "Ids:%+v的归档下载成功!", req.Ids)
	return nil
}

// copyArchiveIntoZip adds one archive file as a zip entry (temp file removed
// afterwards).
func copyArchiveIntoZip(zipWriter *zip.Writer, filePath, archiveFileKey string) error {
	// 1.删除临时文件
	defer func() {
		_ = os.Remove(filePath)
	}()
	// 2.打开文件
	file, err := os.Open(filePath)
	if err != nil {
		return fmt.Errorf("打开文件失败[%s]: %w", archiveFileKey, err)
	}
	defer func() {
		_ = file.Close()
	}()
	// 3.文件打包
	zipFileName := filepath.Base(archiveFileKey)
	zipEntryWriter, err := zipWriter.Create(zipFileName)
	if err != nil {
		return fmt.Errorf("创建ZIP条目失败[%s]: %w", archiveFileKey, err)
	}
	if _, err := io.Copy(zipEntryWriter, file); err != nil {
		return fmt.Errorf("写入ZIP条目失败[%s]: %w", archiveFileKey, err)
	}
	return nil
}