package control

import (
	"crypto/sha256"
	"encoding/hex"

	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/rpc/client"
	"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/control"
	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
	apechain "git.frostfs.info/TrueCloudLab/policy-engine/pkg/chain"
	"github.com/spf13/cobra"
)

var getRuleCmd = &cobra.Command{
	Use:   "get-rule",
	Short: "Get local override",
	Long:  "Get local APE override of the node",
	Run:   getRule,
}

func getRule(cmd *cobra.Command, _ []string) {
	pk := key.Get(cmd)

	var cnr cid.ID
	cidStr, _ := cmd.Flags().GetString(commonflags.CIDFlag)
	commonCmd.ExitOnErr(cmd, "can't decode container ID: %w", cnr.DecodeString(cidStr))

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

	chainID, _ := cmd.Flags().GetString(chainIDFlag)
	hexEncoded, _ := cmd.Flags().GetBool(chainIDHexFlag)

	if hexEncoded {
		chainIDBytes, err := hex.DecodeString(chainID)
		commonCmd.ExitOnErr(cmd, "can't decode chain ID as hex: %w", err)
		chainID = string(chainIDBytes)
	}

	req := &control.GetChainLocalOverrideRequest{
		Body: &control.GetChainLocalOverrideRequest_Body{
			Target: &control.ChainTarget{
				Name: cidStr,
				Type: control.ChainTarget_CONTAINER,
			},
			ChainId: []byte(chainID),
		},
	}

	signRequest(cmd, pk, req)

	cli := getClient(cmd, pk)

	var resp *control.GetChainLocalOverrideResponse
	var err error
	err = cli.ExecRaw(func(client *client.Client) error {
		resp, err = control.GetChainLocalOverride(client, req)
		return err
	})
	commonCmd.ExitOnErr(cmd, "rpc error: %w", err)

	verifyResponse(cmd, resp.GetSignature(), resp.GetBody())

	var chain apechain.Chain
	commonCmd.ExitOnErr(cmd, "decode error: %w", chain.DecodeBytes(resp.GetBody().GetChain()))

	// TODO (aarifullin): make pretty-formatted output for chains.
	cmd.Printf("Parsed chain (chain id hex: '%x'):\n%s\n", chain.ID, prettyJSONFormat(cmd, chain.Bytes()))
}

func initControGetRuleCmd() {
	initControlFlags(getRuleCmd)

	ff := getRuleCmd.Flags()
	ff.String(commonflags.CIDFlag, "", commonflags.CIDFlagUsage)
	ff.String(chainIDFlag, "", "Chain id")
	ff.Bool(chainIDHexFlag, false, "Flag to parse chain ID as hex")
}