package wallet

import (
	context "context"
	"fmt"

	"github.com/phamminh0811/private-grpc/nockchain"
	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials"
)

type NockchainClient struct {
	conn   *grpc.ClientConn
	client nockchain.NockchainServiceClient
}

// NewNockchainClient creates a new gRPC client connection
func NewNockchainClient(address string) (*NockchainClient, error) {
	creds := credentials.NewClientTLSFromCert(nil, "")

	conn, err := grpc.NewClient(
		address,
		grpc.WithTransportCredentials(creds),
	)
	if err != nil {
		return nil, fmt.Errorf("failed to connect: %w", err)
	}

	client := nockchain.NewNockchainServiceClient(conn)

	return &NockchainClient{
		conn:   conn,
		client: client,
	}, nil
}

func (nc *NockchainClient) Close() error {
	return nc.conn.Close()
}

func (nc *NockchainClient) WalletGetBalance(address string) (*nockchain.WalletBalanceData, error) {
	pageToken := ""
	allNotes := []*nockchain.BalanceEntry{}
	var height *nockchain.BlockHeight
	var blockId *nockchain.Hash
	for {
		req := nockchain.WalletGetBalanceRequest{
			Address: address,
			Page: &nockchain.PageRequest{
				ClientPageItemsLimit: 0,
				PageToken:            pageToken,
				MaxBytes:             0,
			},
		}
		resp, err := nc.client.WalletGetBalance(context.Background(), &req)
		if err != nil {
			return nil, err
		}

		balance := nockchain.WalletBalanceData{}
		switch resp.Result.(type) {
		case *nockchain.WalletGetBalanceResponse_Balance:
			balance = *resp.GetBalance()
		case *nockchain.WalletGetBalanceResponse_Error:
			return nil, fmt.Errorf("error: %s", resp.GetError().Message)
		default:
			return nil, fmt.Errorf("invalid result type")
		}

		if height == nil {
			height = balance.Height
			blockId = balance.BlockId
		}

		if balance.Height != height || balance.BlockId != blockId {
			return nil, fmt.Errorf("snapshot changed during pagination; retry")
		}

		allNotes = append(allNotes, balance.Notes...)
		if balance.Page.NextPageToken == "" {
			break
		} else {
			pageToken = balance.Page.NextPageToken
		}
	}
	return &nockchain.WalletBalanceData{
		Notes:   allNotes,
		Height:  height,
		BlockId: blockId,
		Page: &nockchain.PageResponse{
			NextPageToken: "",
		},
	}, nil
}

func (nc *NockchainClient) TxAccepted(txId string) (*nockchain.TransactionAcceptedResponse, error) {
	req := nockchain.TransactionAcceptedRequest{
		TxId: &nockchain.Base58Hash{
			Hash: txId,
		},
	}

	resp, err := nc.client.TransactionAccepted(context.Background(), &req)
	if err != nil {
		return nil, err
	}
	switch resp.Result.(type) {
	case *nockchain.TransactionAcceptedResponse_Accepted:
		return resp, nil
	case *nockchain.TransactionAcceptedResponse_Error:
		return nil, fmt.Errorf("error: %s", resp.GetError().Message)
	default:
		return nil, fmt.Errorf("invalid result type")
	}
}

func (nc *NockchainClient) WalletSendTransaction(tx *nockchain.RawTx) (*nockchain.WalletSendTransactionResponse, error) {
	inputs := []*nockchain.NamedInput{}
	for _, i := range tx.Inputs {
		input, err := ConvertInput(i)
		if err != nil {
			return nil, fmt.Errorf("error converting input: %v", err)
		}
		inputs = append(inputs, input)
	}
	req := nockchain.WalletSendTransactionRequest{
		TxId: ParseHash(tx.TxId),
		RawTx: &nockchain.RawTransaction{
			NamedInputs: inputs,
			TotalFees:   &nockchain.Nicks{Value: tx.TotalFees},
			TimelockRange: &nockchain.TimeLockRangeAbsolute{
				Min: (*nockchain.BlockHeight)(tx.TimelockRange.Min),
				Max: (*nockchain.BlockHeight)(tx.TimelockRange.Max),
			},
		},
	}

	resp, err := nc.client.WalletSendTransaction(context.Background(), &req)
	if err != nil {
		return nil, err
	}

	switch resp.Result.(type) {
	case *nockchain.WalletSendTransactionResponse_Ack:
		return resp, nil
	case *nockchain.WalletSendTransactionResponse_Error:
		return nil, fmt.Errorf("error: %s", resp.GetError().Message)
	default:
		return nil, fmt.Errorf("invalid result type")
	}
}