package metacache

import (
	"context"
	"time"

	"gitlink.org.cn/cloudream/common/pkgs/logger"
	"gitlink.org.cn/cloudream/jcs-pub/client/types"
	stgglb "gitlink.org.cn/cloudream/jcs-pub/common/globals"
	corrpc "gitlink.org.cn/cloudream/jcs-pub/common/pkgs/rpc/coordinator"
	cortypes "gitlink.org.cn/cloudream/jcs-pub/coordinator/types"
)

func (m *MetaCacheHost) AddStorageMeta() *UserSpaceMeta {
	meta := &UserSpaceMeta{
		host: m,
	}
	meta.cache = NewSimpleMetaCache(SimpleMetaCacheConfig[types.UserSpaceID, types.UserSpaceDetail]{
		Getter: meta.load,
		Expire: time.Minute * 5,
	})

	m.caches = append(m.caches, meta)
	return meta
}

type UserSpaceMeta struct {
	host  *MetaCacheHost
	cache *SimpleMetaCache[types.UserSpaceID, types.UserSpaceDetail]
}

func (s *UserSpaceMeta) Get(spaceID types.UserSpaceID) *types.UserSpaceDetail {
	v, ok := s.cache.Get(spaceID)
	if ok {
		return &v
	}
	return nil
}

func (s *UserSpaceMeta) GetMany(spaceIDs []types.UserSpaceID) []*types.UserSpaceDetail {
	vs, oks := s.cache.GetMany(spaceIDs)
	ret := make([]*types.UserSpaceDetail, len(vs))
	for i := range vs {
		if oks[i] {
			ret[i] = &vs[i]
		}
	}
	return ret
}

func (s *UserSpaceMeta) ClearOutdated() {
	s.cache.ClearOutdated()
}

func (s *UserSpaceMeta) load(keys []types.UserSpaceID) ([]types.UserSpaceDetail, []bool) {
	vs := make([]types.UserSpaceDetail, len(keys))
	oks := make([]bool, len(keys))

	spaces, err := s.host.db.UserSpace().BatchGetByID(s.host.db.DefCtx(), keys)
	if err != nil {
		logger.Warnf("batch get user space by id: %v", err)
		return vs, oks
	}

	detailMap := make(map[types.UserSpaceID]*types.UserSpaceDetail)
	for i := range spaces {
		detailMap[spaces[i].UserSpaceID] = &types.UserSpaceDetail{
			UserID:    stgglb.Local.UserID,
			UserSpace: spaces[i],
		}
	}

	if !stgglb.StandaloneMode {
		coorCli := stgglb.CoordinatorRPCPool.Get()
		defer coorCli.Release()

		stgs := make([]cortypes.StorageType, len(spaces))
		for i := range spaces {
			stgs[i] = spaces[i].Storage
		}

		selectHubs, cerr := coorCli.SelectStorageHub(context.Background(), &corrpc.SelectStorageHub{
			Storages: stgs,
		})
		if cerr != nil {
			logger.Warnf("get storage details: %v", cerr)
			return vs, oks
		}

		for i := range spaces {
			detailMap[spaces[i].UserSpaceID].RecommendHub = selectHubs.Hubs[i]
		}
	}

	for i := range keys {
		if detail, ok := detailMap[keys[i]]; ok {
			vs[i] = *detail
			oks[i] = true
		}
	}

	return vs, oks
}