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 getSubtreeCmd = &cobra.Command{
	Use:   "get-subtree",
	Short: "Get subtree",
	Run:   getSubTree,
	PersistentPreRun: func(cmd *cobra.Command, _ []string) {
		commonflags.Bind(cmd)
	},
}

func initGetSubtreeCmd() {
	commonflags.Init(getSubtreeCmd)
	initCTID(getSubtreeCmd)

	ff := getSubtreeCmd.Flags()
	ff.Uint64(rootIDFlagKey, 0, "Root ID to traverse from.")
	ff.Uint32(depthFlagKey, 10, "Traversal depth.")

	_ = getSubtreeCmd.MarkFlagRequired(commonflags.CIDFlag)
	_ = getSubtreeCmd.MarkFlagRequired(treeIDFlagKey)

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

func getSubTree(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)

	rid, _ := cmd.Flags().GetUint64(rootIDFlagKey)

	depth, _ := cmd.Flags().GetUint32(depthFlagKey)

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

	req := &tree.GetSubTreeRequest{
		Body: &tree.GetSubTreeRequest_Body{
			ContainerId: rawCID,
			TreeId:      tid,
			RootId:      []uint64{rid},
			Depth:       depth,
			BearerToken: bt,
		},
	}

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

	resp, err := cli.GetSubTree(ctx, req)
	commonCmd.ExitOnErr(cmd, "failed to call getSubTree: %w", err)

	subtreeResp, err := resp.Recv()
	for ; err == nil; subtreeResp, err = resp.Recv() {
		b := subtreeResp.GetBody()

		if len(b.GetNodeId()) == 1 {
			cmd.Printf("Node ID: %d\n", b.GetNodeId())
			cmd.Println("\tParent ID: ", b.GetParentId())
			cmd.Println("\tTimestamp: ", b.GetTimestamp())
		} else {
			cmd.Printf("Node IDs: %v\n", b.GetNodeId())
			cmd.Println("\tParent IDs: ", b.GetParentId())
			cmd.Println("\tTimestamps: ", b.GetTimestamp())
		}

		if meta := b.GetMeta(); len(meta) > 0 {
			cmd.Println("\tMeta pairs: ")
			for _, kv := range meta {
				cmd.Printf("\t\t%s: %s\n", kv.GetKey(), string(kv.GetValue()))
			}
		}
	}
	if !errors.Is(err, io.EOF) {
		commonCmd.ExitOnErr(cmd, "rpc call: %w", err)
	}
}