package morph

import (
	"errors"
	"fmt"
	"regexp"

	commonCmd "git.frostfs.info/TrueCloudLab/frostfs-node/cmd/internal/common"
	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
	"github.com/nspcc-dev/neo-go/pkg/encoding/address"
	"github.com/nspcc-dev/neo-go/pkg/util"
	"github.com/spf13/cobra"
	"github.com/spf13/viper"
)

var (
	frostfsidSubjectNameRegexp = regexp.MustCompile(`^[\w+=,.@-]{1,64}$`)
	frostfsidGroupNameRegexp   = regexp.MustCompile(`^[\w+=,.@-]{1,128}$`)

	// frostfsidNamespaceNameRegexp similar to https://git.frostfs.info/TrueCloudLab/frostfs-contract/src/commit/f2a82aa635aa57d9b05092d8cf15b170b53cc324/nns/nns_contract.go#L690
	frostfsidNamespaceNameRegexp = regexp.MustCompile(`(^$)|(^[a-z0-9]{1,2}$)|(^[a-z0-9][a-z0-9-]{1,48}[a-z0-9]$)`)
)

func getFrostfsIDAdmin(v *viper.Viper) (util.Uint160, bool, error) {
	admin := v.GetString(frostfsIDAdminConfigKey)
	if admin == "" {
		return util.Uint160{}, false, nil
	}

	h, err := address.StringToUint160(admin)
	if err == nil {
		return h, true, nil
	}

	h, err = util.Uint160DecodeStringLE(admin)
	if err == nil {
		return h, true, nil
	}

	pk, err := keys.NewPublicKeyFromString(admin)
	if err == nil {
		return pk.GetScriptHash(), true, nil
	}
	return util.Uint160{}, true, fmt.Errorf("frostfsid: admin is invalid: '%s'", admin)
}

func getFrostfsIDSubjectKey(cmd *cobra.Command) *keys.PublicKey {
	subjKeyHex, _ := cmd.Flags().GetString(subjectKeyFlag)
	subjKey, err := keys.NewPublicKeyFromString(subjKeyHex)
	commonCmd.ExitOnErr(cmd, "invalid subject key: %w", err)
	return subjKey
}

func getFrostfsIDSubjectAddress(cmd *cobra.Command) util.Uint160 {
	subjAddress, _ := cmd.Flags().GetString(subjectAddressFlag)
	subjAddr, err := address.StringToUint160(subjAddress)
	commonCmd.ExitOnErr(cmd, "invalid subject address: %w", err)
	return subjAddr
}

func getFrostfsIDSubjectName(cmd *cobra.Command) string {
	subjectName, _ := cmd.Flags().GetString(subjectNameFlag)

	if subjectName == "" {
		return ""
	}

	if !frostfsidSubjectNameRegexp.MatchString(subjectName) {
		commonCmd.ExitOnErr(cmd, "invalid subject name: %w",
			fmt.Errorf("name must match regexp: %s", frostfsidSubjectNameRegexp.String()))
	}

	return subjectName
}

func getFrostfsIDGroupName(cmd *cobra.Command) string {
	groupName, _ := cmd.Flags().GetString(groupNameFlag)

	if !frostfsidGroupNameRegexp.MatchString(groupName) {
		commonCmd.ExitOnErr(cmd, "invalid group name: %w",
			fmt.Errorf("name must match regexp: %s", frostfsidGroupNameRegexp.String()))
	}

	return groupName
}

func getFrostfsIDGroupID(cmd *cobra.Command) int64 {
	groupID, _ := cmd.Flags().GetInt64(groupIDFlag)
	if groupID <= 0 {
		commonCmd.ExitOnErr(cmd, "invalid group id: %w",
			errors.New("group id must be positive integer"))
	}

	return groupID
}

func getFrostfsIDNamespace(cmd *cobra.Command) string {
	ns, _ := cmd.Flags().GetString(namespaceFlag)
	if ns == rootNamespacePlaceholder {
		ns = ""
	}

	if !frostfsidNamespaceNameRegexp.MatchString(ns) {
		commonCmd.ExitOnErr(cmd, "invalid namespace: %w",
			fmt.Errorf("name must match regexp: %s", frostfsidNamespaceNameRegexp.String()))
	}

	return ns
}