package writecache

import (
	"context"
	"fmt"
	"os"

	"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/fstree"
	storagelog "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/internal/log"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util"
	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client"
	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
	"go.uber.org/zap"
)

func (c *cache) openStore(mod mode.ComponentMode) error {
	err := util.MkdirAllX(c.path, os.ModePerm)
	if err != nil {
		return err
	}

	c.fsTree = fstree.New(
		fstree.WithPath(c.path),
		fstree.WithPerm(os.ModePerm),
		fstree.WithDepth(1),
		fstree.WithDirNameLen(1),
		fstree.WithNoSync(c.noSync),
		fstree.WithFileCounter(c.counter),
	)
	if err := c.fsTree.Open(mod); err != nil {
		return fmt.Errorf("could not open FSTree: %w", err)
	}
	if err := c.fsTree.Init(); err != nil {
		return fmt.Errorf("could not init FSTree: %w", err)
	}

	return nil
}

func (c *cache) deleteFromDisk(ctx context.Context, addr oid.Address, size uint64) {
	_, err := c.fsTree.Delete(ctx, common.DeletePrm{Address: addr, Size: size})
	if err != nil && !client.IsErrObjectNotFound(err) {
		c.log.Error(ctx, logs.WritecacheCantRemoveObjectFromWritecache, zap.Error(err))
	} else if err == nil {
		storagelog.Write(ctx, c.log,
			storagelog.AddressField(addr.EncodeToString()),
			storagelog.StorageTypeField(wcStorageType),
			storagelog.OpField("fstree DELETE"),
		)
		c.metrics.Evict(StorageTypeFSTree)
		// counter changed by fstree
		c.estimateCacheSize()
	}
}