package contract

import (
	"context"
	"fmt"

	"git.frostfs.info/TrueCloudLab/frostfs-contract/frostfsid/client"
	frostfsutil "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs/util"
	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
	"github.com/nspcc-dev/neo-go/pkg/rpcclient"
	"github.com/nspcc-dev/neo-go/pkg/util"
	"github.com/nspcc-dev/neo-go/pkg/wallet"
)

type FrostFSID struct {
	cli *client.Client
}

type Config struct {
	// RPCAddress is an endpoint to connect to neo rpc.
	RPCAddress string

	// Contract is hash of contract or its name in NNS.
	Contract string

	// ProxyContract is hash of proxy contract or its name in NNS to interact with frostfsid.
	ProxyContract string

	// Key is used to interact with frostfsid contract.
	// If this is nil than random key will be generated.
	Key *keys.PrivateKey
}

// New creates new FrostfsID contract wrapper that implements auth.FrostFSID interface.
func New(ctx context.Context, cfg Config) (*FrostFSID, error) {
	contractHash, err := frostfsutil.ResolveContractHash(cfg.Contract, cfg.RPCAddress)
	if err != nil {
		return nil, fmt.Errorf("resolve frostfs contract hash: %w", err)
	}

	key := cfg.Key
	if key == nil {
		if key, err = keys.NewPrivateKey(); err != nil {
			return nil, fmt.Errorf("generate anon private key for frostfsid: %w", err)
		}
	}

	rpcCli, err := rpcclient.New(ctx, cfg.RPCAddress, rpcclient.Options{})
	if err != nil {
		return nil, fmt.Errorf("init rpc client: %w", err)
	}

	var opt client.Options
	opt.ProxyContract, err = frostfsutil.ResolveContractHash(cfg.ProxyContract, cfg.RPCAddress)
	if err != nil {
		return nil, fmt.Errorf("resolve frostfs contract hash: %w", err)
	}

	cli, err := client.New(rpcCli, wallet.NewAccountFromPrivateKey(key), contractHash, opt)
	if err != nil {
		return nil, fmt.Errorf("init frostfsid client: %w", err)
	}

	return &FrostFSID{
		cli: cli,
	}, nil
}

func (f *FrostFSID) GetSubjectExtended(userHash util.Uint160) (*client.SubjectExtended, error) {
	return f.cli.GetSubjectExtended(userHash)
}

func (f *FrostFSID) GetSubjectKeyByName(namespace, name string) (*keys.PublicKey, error) {
	return f.cli.GetSubjectKeyByName(namespace, name)
}

func (f *FrostFSID) CreateSubject(namespace string, key *keys.PublicKey) (util.Uint256, uint32, error) {
	return f.cli.CreateSubject(namespace, key)
}

func (f *FrostFSID) Wait(tx util.Uint256, vub uint32, err error) error {
	_, err = f.cli.Wait(tx, vub, err)
	return err
}