package tree

import (
	"crypto/sha256"
	"errors"
	"io"

	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-cli/internal/common"
	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-cli/internal/commonflags"
	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-cli/internal/key"
	commonCmd "git.frostfs.info/TrueCloudLab/frostfs-node/cmd/internal/common"
	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/tree"
	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
	"github.com/spf13/cobra"
)

var moveCmd = &cobra.Command{
	Use:   "move",
	Short: "Move node",
	Run:   move,
	PersistentPreRun: func(cmd *cobra.Command, _ []string) {
		commonflags.Bind(cmd)
	},
}

func initMoveCmd() {
	commonflags.Init(moveCmd)
	initCTID(moveCmd)

	ff := moveCmd.Flags()
	ff.Uint64(nodeIDFlagKey, 0, "Node ID.")
	ff.Uint64(parentIDFlagKey, 0, "Parent ID.")

	_ = getSubtreeCmd.MarkFlagRequired(nodeIDFlagKey)
	_ = getSubtreeCmd.MarkFlagRequired(parentIDFlagKey)

	_ = cobra.MarkFlagRequired(ff, commonflags.RPC)
}

func move(cmd *cobra.Command, _ []string) {
	pk := key.GetOrGenerate(cmd)
	cidString, _ := cmd.Flags().GetString(commonflags.CIDFlag)

	var cnr cid.ID
	err := cnr.DecodeString(cidString)
	commonCmd.ExitOnErr(cmd, "decode container ID string: %w", err)

	ctx := cmd.Context()

	cli, err := _client(ctx)
	commonCmd.ExitOnErr(cmd, "failed to create client: %w", err)

	rawCID := make([]byte, sha256.Size)
	cnr.Encode(rawCID)

	tid, _ := cmd.Flags().GetString(treeIDFlagKey)
	pid, _ := cmd.Flags().GetUint64(parentIDFlagKey)
	nid, _ := cmd.Flags().GetUint64(nodeIDFlagKey)

	var bt []byte
	if t := common.ReadBearerToken(cmd, bearerFlagKey); t != nil {
		bt = t.Marshal()
	}

	subTreeReq := &tree.GetSubTreeRequest{
		Body: &tree.GetSubTreeRequest_Body{
			ContainerId: rawCID,
			TreeId:      tid,
			RootId:      nid,
			Depth:       1,
			BearerToken: bt,
		},
	}
	commonCmd.ExitOnErr(cmd, "signing message: %w", tree.SignMessage(subTreeReq, pk))
	resp, err := cli.GetSubTree(ctx, subTreeReq)
	commonCmd.ExitOnErr(cmd, "rpc call: %w", err)

	var meta []*tree.KeyValue
	subtreeResp, err := resp.Recv()
	for ; err == nil; subtreeResp, err = resp.Recv() {
		meta = subtreeResp.GetBody().GetMeta()
	}
	if !errors.Is(err, io.EOF) {
		commonCmd.ExitOnErr(cmd, "failed to read getSubTree response stream: %w", err)
	}
	var metaErr error
	if len(meta) == 0 {
		metaErr = errors.New("no meta for given node ID")
	}
	commonCmd.ExitOnErr(cmd, "unexpected rpc call result: %w", metaErr)

	req := &tree.MoveRequest{
		Body: &tree.MoveRequest_Body{
			ContainerId: rawCID,
			TreeId:      tid,
			ParentId:    pid,
			NodeId:      nid,
			Meta:        meta,
		},
	}

	commonCmd.ExitOnErr(cmd, "signing message: %w", tree.SignMessage(req, pk))

	_, err = cli.Move(ctx, req)
	commonCmd.ExitOnErr(cmd, "failed to call move: %w", err)
	common.PrintVerbose(cmd, "Successful move invocation.")
}