package control

import (
	"errors"
	"fmt"
	"strings"

	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/rpc/client"
	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-cli/internal/key"
	"git.frostfs.info/TrueCloudLab/frostfs-node/cmd/frostfs-cli/modules/util"
	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/nspcc-dev/neo-go/cli/input"
	"github.com/spf13/cobra"
)

var listRulesCmd = &cobra.Command{
	Use:   "list-rules",
	Short: "List local overrides",
	Long:  "List local APE overrides of the node",
	Run:   listRules,
}

const (
	defaultNamespace = "root"
	namespaceTarget  = "namespace"
	containerTarget  = "container"
	userTarget       = "user"
	groupTarget      = "group"
)

const (
	targetNameFlag = "target-name"
	targetNameDesc = "Resource name in APE resource name format"
	targetTypeFlag = "target-type"
	targetTypeDesc = "Resource type(container/namespace)"
)

var (
	errSettingDefaultValueWasDeclined = errors.New("setting default value was declined")
	errUnknownTargetType              = errors.New("unknown target type")
)

func parseTarget(cmd *cobra.Command) *control.ChainTarget {
	typ, _ := cmd.Flags().GetString(targetTypeFlag)
	name, _ := cmd.Flags().GetString(targetNameFlag)
	switch typ {
	case namespaceTarget:
		if name == "" {
			ln, err := input.ReadLine(fmt.Sprintf("Target name is not set. Confirm to use %s namespace (n|Y)> ", defaultNamespace))
			commonCmd.ExitOnErr(cmd, "read line error: %w", err)
			ln = strings.ToLower(ln)
			if len(ln) > 0 && (ln[0] == 'n') {
				commonCmd.ExitOnErr(cmd, "read namespace error: %w", errSettingDefaultValueWasDeclined)
			}
			name = defaultNamespace
		}
		return &control.ChainTarget{
			Name: name,
			Type: control.ChainTarget_NAMESPACE,
		}
	case containerTarget:
		var cnr cid.ID
		commonCmd.ExitOnErr(cmd, "can't decode container ID: %w", cnr.DecodeString(name))
		return &control.ChainTarget{
			Name: name,
			Type: control.ChainTarget_CONTAINER,
		}
	case userTarget:
		return &control.ChainTarget{
			Name: name,
			Type: control.ChainTarget_USER,
		}
	case groupTarget:
		return &control.ChainTarget{
			Name: name,
			Type: control.ChainTarget_GROUP,
		}
	default:
		commonCmd.ExitOnErr(cmd, "read target type error: %w", errUnknownTargetType)
	}
	return nil
}

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

	target := parseTarget(cmd)
	req := &control.ListChainLocalOverridesRequest{
		Body: &control.ListChainLocalOverridesRequest_Body{
			Target: target,
		},
	}

	signRequest(cmd, pk, req)

	cli := getClient(cmd, pk)

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

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

	chains := resp.GetBody().GetChains()
	if len(chains) == 0 {
		cmd.Printf("Local overrides are not defined for the %s.\n", strings.ToLower(target.GetType().String()))
		return
	}

	for _, c := range chains {
		var chain apechain.Chain
		commonCmd.ExitOnErr(cmd, "decode error: %w", chain.DecodeBytes(c))
		util.PrintHumanReadableAPEChain(cmd, &chain)
	}
}

func initControlListRulesCmd() {
	initControlFlags(listRulesCmd)

	ff := listRulesCmd.Flags()
	ff.String(targetNameFlag, "", targetNameDesc)
	ff.String(targetTypeFlag, "", targetTypeDesc)
	_ = listRulesCmd.MarkFlagRequired(targetTypeFlag)
}