package ticktock

import (
	"fmt"
	"time"

	"gitlink.org.cn/cloudream/common/pkgs/logger"
	"gitlink.org.cn/cloudream/common/utils/reflect2"
	"gitlink.org.cn/cloudream/jcs-pub/client/internal/db"
	jcstypes "gitlink.org.cn/cloudream/jcs-pub/common/types"

	"gitlink.org.cn/cloudream/jcs-pub/client/internal/publock/reqbuilder"
)

type UserSpaceGC struct {
}

func (j *UserSpaceGC) Name() string {
	return reflect2.TypeNameOf[UserSpaceGC]()
}

// Execute 执行垃圾回收操作。
func (j *UserSpaceGC) Execute(t *TickTock) {
	log := logger.WithType[UserSpaceGC]("Event")
	startTime := time.Now()
	log.Infof("job start")
	defer func() {
		log.Infof("job end, time: %v", time.Since(startTime))
	}()

	spaceIDs, err := t.db.UserSpace().GetAllIDs(t.db.DefCtx())
	if err != nil {
		log.Warnf("getting user space ids: %v", err)
		return
	}

	for _, spaceID := range spaceIDs {
		detail := t.spaceMeta.Get(spaceID)
		if detail == nil {
			continue
		}

		j.gcOne(t, detail)
	}
}

func (j *UserSpaceGC) gcOne(t *TickTock, space *jcstypes.UserSpaceDetail) {
	log := logger.WithType[UserSpaceGC]("Event")

	mutex, err := reqbuilder.NewBuilder().UserSpace().GC(space.UserSpace.UserSpaceID).MutexLock(t.pubLock)
	if err != nil {
		log.Warnf("acquire lock: %v", err)
		return
	}
	defer mutex.Unlock()

	if err := j.gcShards(t, space); err != nil {
		log.Warnf("gc shard store of %v: %v", space.UserSpace.UserSpaceID, err)
	}

	if err := j.gcTemps(t, space); err != nil {
		log.Warnf("gc base store of %v: %v", space.UserSpace.UserSpaceID, err)
	}
}

func (j *UserSpaceGC) gcShards(t *TickTock, space *jcstypes.UserSpaceDetail) error {
	db2 := t.db

	// 收集需要进行垃圾回收的文件哈希值
	var allFileHashes []jcstypes.FileHash
	err := db2.DoTx(func(tx db.SQLContext) error {
		blocks, err := db2.ObjectBlock().GetByUserSpaceID(tx, space.UserSpace.UserSpaceID)
		if err != nil {
			return fmt.Errorf("getting object blocks by hub id: %w", err)
		}
		for _, c := range blocks {
			allFileHashes = append(allFileHashes, c.FileHash)
		}

		objs, err := db2.PinnedObject().GetObjectsByUserSpaceID(tx, space.UserSpace.UserSpaceID)
		if err != nil {
			return fmt.Errorf("getting pinned objects by hub id: %w", err)
		}
		for _, o := range objs {
			allFileHashes = append(allFileHashes, o.FileHash)
		}

		return nil
	})
	if err != nil {
		return err
	}

	store, err := t.stgPool.GetShardStore(space)
	if err != nil {
		return fmt.Errorf("getting shard store: %w", err)
	}

	err = store.GC(allFileHashes)
	if err != nil {
		return fmt.Errorf("gc shard store: %w", err)
	}

	return nil
}

func (j *UserSpaceGC) gcTemps(t *TickTock, space *jcstypes.UserSpaceDetail) error {
	store, err := t.stgPool.GetBaseStore(space)
	if err != nil {
		return fmt.Errorf("getting base store: %w", err)
	}

	store.CleanTemps()
	return nil
}