package service

import (
	"context"
	"fmt"
	"io"
	"net/url"
	"oss/consts"
	"oss/dao"
	"oss/minio"
	"oss/model/dto"
	"oss/model/entity"
	"time"

	"github.com/gogf/gf/v2/net/ghttp"
	"github.com/gogf/gf/v2/os/glog"

	"gitea.redpowerfuture.com/red-future/common/utils"
	"github.com/gogf/gf/v2/errors/gerror"
	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/util/gconv"
)

type file struct{}

// File 存储文件服务
var File = new(file)

func (f *file) DownloadToFile(ctx context.Context, req *dto.DownloadToFileReq) (err error) {
	return minio.DownloadToFile(ctx, req.FileURL, req.LocalPath)
}

// DownloadToBrowser 下载文件到浏览器
func (f *file) DownloadToBrowser(ctx context.Context, req *dto.DownloadToBrowserReq) (err error) {
	// 拿到流，而不是全量字节数组
	reader, fileName, contentType, fileSize, err := minio.DownloadToBrowser(ctx, req.FileURL)
	if err != nil {
		return err
	}

	// 重要：确保流最后关闭
	if closer, ok := reader.(io.Closer); ok {
		defer closer.Close()
	}

	r := ghttp.RequestFromCtx(ctx)
	resp := r.Response

	resp.Header().Set("Content-Type", contentType)
	resp.Header().Set("Content-Disposition", fmt.Sprintf(
		`attachment; filename="%s"; filename*=UTF-8''%s`,
		fileName, url.PathEscape(fileName),
	))
	resp.Header().Set("Content-Length", fmt.Sprintf("%d", fileSize))
	resp.Header().Del("Content-Encoding")
	resp.Header().Del("Transfer-Encoding")
	data, err := io.ReadAll(reader)
	if err != nil {
		return err
	}
	resp.WriteExit(data)
	return
}

func (f *file) DeleteFile(ctx context.Context, req *dto.DeleteFileReq) (err error) {
	return minio.DeleteFile(ctx, req.FileURL)
}

func (f *file) UploadFile(ctx context.Context, req *dto.UploadFileReq) (res *dto.UploadFileRes, err error) {
	fileReq := new(dto.UploadFileReq)
	if !g.IsEmpty(req.File) {
		fileReq.Files = &ghttp.UploadFiles{req.File}
		files, err := f.UploadFiles(ctx, fileReq)
		if err != nil {
			return nil, err
		}
		res = files.Items[0]
	} else if !g.IsEmpty(req.Files) {
		fileReq.Files = req.Files
		res, err = f.UploadFiles(ctx, fileReq)
	} else {
		return nil, gerror.New("上传内容不能为空")
	}
	return
}

// UploadFiles 上传多个文件（新接口）
func (f *file) UploadFiles(ctx context.Context, req *dto.UploadFileReq) (res *dto.UploadFileRes, err error) {
	var files = *req.Files

	totalAdd := 0
	for _, file := range files {
		if file == nil {
			continue
		}
		totalAdd += gconv.Int(file.Size)
	}
	tenantId, err := f.reserveTenantOssSize(ctx, totalAdd)
	if err != nil {
		return nil, err
	}

	prefix, _ := utils.GetFileAddressPrefix(ctx)
	items := make([]*dto.UploadFileRes, 0, len(files))

	for _, file := range files {
		if file == nil {
			continue
		}

		fileURL, fileName, fileFormat, e := minio.UploadFile(ctx, file)
		if e != nil {
			glog.Errorf(ctx, "上传文件失败: %v", e)
			return nil, e
		}

		ossEntity := &dto.UploadFile{
			TenantId: tenantId,
			FileURL:  fileURL,
			FileSize: gconv.Int(file.Size),
		}
		if _, e = dao.File.Insert(ctx, ossEntity); e != nil {
			return nil, e
		}

		items = append(items, &dto.UploadFileRes{
			FileURL:           fileURL,
			FileSize:          gconv.Int(file.Size),
			FileName:          fileName,
			FileFormat:        fileFormat,
			FileAddressPrefix: prefix,
		})
	}
	fileRes := &dto.UploadFileRes{
		FileAddressPrefix: prefix,
		Items:             items,
	}
	return fileRes, nil
}

func (f *file) reserveTenantOssSize(ctx context.Context, addSize int) (tenantId uint64, err error) {
	if addSize < 0 {
		err = gerror.New("addSize 不能为负数")
		return
	}
	// 获取租户id
	user, e := utils.GetUserInfo(ctx)
	if e != nil {
		err = e
		glog.Errorf(ctx, "获取用户信息失败: %v", err)
		return
	}
	tenantId = user.TenantId

	// 获取redis-租户存储容量总数key
	tenantOssTotalKey := fmt.Sprintf(consts.TenantOssTotalKey, gconv.String(user.TenantId))
	// 获取redis-租户存储-锁key
	fileLockKey := fmt.Sprintf(consts.FileLockKey, gconv.String(user.TenantId))

	success, e := utils.Lock(ctx, fileLockKey, gconv.Int64(time.Minute*1), func(ctx context.Context) error {
		// 获取redis-租户存储容量总数
		get, e := g.Redis().Get(ctx, tenantOssTotalKey)
		if e != nil {
			glog.Errorf(ctx, "获取redis-租户存储容量总数失败: %v", e)
			return e
		}
		tenantOssTotalEntity := &entity.TenantOssTotal{}
		if g.IsEmpty(get) {
			//查询数据库-获取租户存储容量总数
			getByTenantIdReq := &dto.GetByTenantIdReq{
				TenantId: user.TenantId,
			}
			tenantOssTotalRes, e := dao.TenantOssTotal.GetOneByTenantId(ctx, getByTenantIdReq)
			if e != nil {
				glog.Errorf(ctx, "查询数据库-获取租户存储容量总数失败: %v", e)
				return e
			}
			if tenantOssTotalRes == nil || g.IsEmpty(tenantOssTotalRes.Id) {
				// 数据库中没有该租户的记录，创建默认配置
				tenantOssTotalEntity.TenantId = user.TenantId
				tenantOssTotalEntity.UsedOssSize = 0
				tenantOssTotalEntity.TotalOssSize = g.Cfg().MustGet(ctx, "oss.capacitySize").Int() * 1024 * 1024
			} else {
				tenantOssTotalEntity = tenantOssTotalRes
			}
		} else {
			// 反序列化-redis获取租户存储容量总数
			if e = gconv.Struct(get, tenantOssTotalEntity); e != nil {
				glog.Errorf(ctx, "反序列化-redis获取租户存储容量总数失败: %v", e)
				return e
			}
		}
		tenantId = tenantOssTotalEntity.TenantId
		usedAfter := tenantOssTotalEntity.UsedOssSize + addSize
		total := tenantOssTotalEntity.TotalOssSize

		if usedAfter > total {
			return gerror.New("存储服务内存不足")
		}

		// 设置redis-租户存储容量总数（超时时间10分钟）
		tenantOssTotalKeyMap := dto.UpdateUsedOssReq{
			TenantId:     tenantId,
			UsedOssSize:  usedAfter,
			TotalOssSize: total,
			Creator:      user.UserName,
			Updater:      user.UserName,
		}
		if e = g.Redis().SetEX(ctx, tenantOssTotalKey, tenantOssTotalKeyMap, gconv.Int64(time.Minute*10)); e != nil {
			glog.Errorf(ctx, "修改redis-租户存储容量总数失败: %v", e)
			return e
		}
		return nil
	})
	if e != nil {
		err = e
		return
	}
	if !success {
		err = gerror.New("存储服务内存不足")
		return
	}
	return
}