package transfer

import (
	"database/sql"
	"fmt"
	"math/big"

	ethTypes "github.com/ethereum/go-ethereum/core/types"

	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/common/hexutil"
	"github.com/ethereum/go-ethereum/event"
	"github.com/status-im/status-go/account"
	"github.com/status-im/status-go/eth-node/crypto"
	"github.com/status-im/status-go/eth-node/types"
	"github.com/status-im/status-go/multiaccounts/accounts"
	"github.com/status-im/status-go/params"
	"github.com/status-im/status-go/services/wallet/bridge"
	wallet_common "github.com/status-im/status-go/services/wallet/common"
	"github.com/status-im/status-go/services/wallet/walletevent"
	"github.com/status-im/status-go/transactions"
)

type MultiTransactionIDType int64

const (
	NoMultiTransactionID = MultiTransactionIDType(0)

	// EventMTTransactionUpdate is emitted when a multi-transaction is updated (added or deleted)
	EventMTTransactionUpdate walletevent.EventType = "multi-transaction-update"
)

type SignatureDetails struct {
	R string `json:"r"`
	S string `json:"s"`
	V string `json:"v"`
}

type TransactionDescription struct {
	chainID   uint64
	builtTx   *ethTypes.Transaction
	signature []byte
	unlock    transactions.UnlockNonceFunc
}

type TransactionManager struct {
	db             *sql.DB
	gethManager    *account.GethManager
	transactor     *transactions.Transactor
	config         *params.NodeConfig
	accountsDB     *accounts.Database
	pendingTracker *transactions.PendingTxTracker
	eventFeed      *event.Feed

	multiTransactionForKeycardSigning *MultiTransaction
	transactionsBridgeData            []*bridge.TransactionBridge
	transactionsForKeycardSingning    map[common.Hash]*TransactionDescription
}

func NewTransactionManager(
	db *sql.DB,
	gethManager *account.GethManager,
	transactor *transactions.Transactor,
	config *params.NodeConfig,
	accountsDB *accounts.Database,
	pendingTxManager *transactions.PendingTxTracker,
	eventFeed *event.Feed,
) *TransactionManager {
	return &TransactionManager{
		db:             db,
		gethManager:    gethManager,
		transactor:     transactor,
		config:         config,
		accountsDB:     accountsDB,
		pendingTracker: pendingTxManager,
		eventFeed:      eventFeed,
	}
}

var (
	emptyHash = common.Hash{}
)

type MultiTransactionType uint8

const (
	MultiTransactionSend = iota
	MultiTransactionSwap
	MultiTransactionBridge
)

type MultiTransaction struct {
	ID            uint                 `json:"id"`
	Timestamp     uint64               `json:"timestamp"`
	FromNetworkID uint64               `json:"fromNetworkID"`
	ToNetworkID   uint64               `json:"toNetworkID"`
	FromTxHash    common.Hash          `json:"fromTxHash"`
	ToTxHash      common.Hash          `json:"toTxHash"`
	FromAddress   common.Address       `json:"fromAddress"`
	ToAddress     common.Address       `json:"toAddress"`
	FromAsset     string               `json:"fromAsset"`
	ToAsset       string               `json:"toAsset"`
	FromAmount    *hexutil.Big         `json:"fromAmount"`
	ToAmount      *hexutil.Big         `json:"toAmount"`
	Type          MultiTransactionType `json:"type"`
	CrossTxID     string
}

type MultiTransactionCommand struct {
	FromAddress common.Address       `json:"fromAddress"`
	ToAddress   common.Address       `json:"toAddress"`
	FromAsset   string               `json:"fromAsset"`
	ToAsset     string               `json:"toAsset"`
	FromAmount  *hexutil.Big         `json:"fromAmount"`
	Type        MultiTransactionType `json:"type"`
}

type MultiTransactionCommandResult struct {
	ID     int64                   `json:"id"`
	Hashes map[uint64][]types.Hash `json:"hashes"`
}

type TransactionIdentity struct {
	ChainID wallet_common.ChainID `json:"chainId"`
	Hash    common.Hash           `json:"hash"`
	Address common.Address        `json:"address"`
}

type TxResponse struct {
	KeyUID        string                  `json:"keyUid,omitempty"`
	Address       types.Address           `json:"address,omitempty"`
	AddressPath   string                  `json:"addressPath,omitempty"`
	SignOnKeycard bool                    `json:"signOnKeycard,omitempty"`
	ChainID       uint64                  `json:"chainId,omitempty"`
	MesageToSign  interface{}             `json:"messageToSign,omitempty"`
	TxArgs        transactions.SendTxArgs `json:"txArgs,omitempty"`
}

func (tm *TransactionManager) SignMessage(message types.HexBytes, address common.Address, password string) (string, error) {
	selectedAccount, err := tm.gethManager.VerifyAccountPassword(tm.config.KeyStoreDir, address.Hex(), password)
	if err != nil {
		return "", err
	}

	signature, err := crypto.Sign(message[:], selectedAccount.PrivateKey)

	return types.EncodeHex(signature), err
}

func (tm *TransactionManager) BuildTransaction(chainID uint64, sendArgs transactions.SendTxArgs) (response *TxResponse, err error) {
	account, err := tm.accountsDB.GetAccountByAddress(sendArgs.From)
	if err != nil {
		return nil, fmt.Errorf("failed to resolve account: %w", err)
	}

	kp, err := tm.accountsDB.GetKeypairByKeyUID(account.KeyUID)
	if err != nil {
		return nil, err
	}

	txBeingSigned, unlock, err := tm.transactor.ValidateAndBuildTransaction(chainID, sendArgs)
	if err != nil {
		return nil, err
	}
	// We have to unlock the nonce, cause we don't know what will happen on the client side (will user accept/reject) an action.
	if unlock != nil {
		defer func() {
			unlock(false, 0)
		}()
	}

	// Set potential missing fields that were added while building the transaction
	if sendArgs.Value == nil {
		value := hexutil.Big(*txBeingSigned.Value())
		sendArgs.Value = &value
	}
	if sendArgs.Nonce == nil {
		nonce := hexutil.Uint64(txBeingSigned.Nonce())
		sendArgs.Nonce = &nonce
	}
	if sendArgs.GasPrice == nil {
		gasPrice := hexutil.Big(*txBeingSigned.GasPrice())
		sendArgs.GasPrice = &gasPrice
	}
	if sendArgs.MaxPriorityFeePerGas == nil {
		maxPriorityFeePerGas := hexutil.Big(*txBeingSigned.GasTipCap())
		sendArgs.MaxPriorityFeePerGas = &maxPriorityFeePerGas
	}
	if sendArgs.MaxFeePerGas == nil {
		maxFeePerGas := hexutil.Big(*txBeingSigned.GasFeeCap())
		sendArgs.MaxFeePerGas = &maxFeePerGas
	}

	signer := ethTypes.NewLondonSigner(new(big.Int).SetUint64(chainID))

	return &TxResponse{
		KeyUID:        account.KeyUID,
		Address:       account.Address,
		AddressPath:   account.Path,
		SignOnKeycard: kp.MigratedToKeycard(),
		ChainID:       chainID,
		MesageToSign:  signer.Hash(txBeingSigned),
		TxArgs:        sendArgs,
	}, nil
}

func (tm *TransactionManager) SendTransactionWithSignature(chainID uint64, txType transactions.PendingTrxType, sendArgs transactions.SendTxArgs, signature []byte) (hash types.Hash, err error) {
	hash, err = tm.transactor.BuildTransactionAndSendWithSignature(chainID, sendArgs, signature)
	if err != nil {
		return hash, err
	}

	err = tm.pendingTracker.TrackPendingTransaction(
		wallet_common.ChainID(chainID),
		common.Hash(hash),
		common.Address(sendArgs.From),
		txType,
		transactions.AutoDelete,
	)
	if err != nil {
		return hash, err
	}

	return hash, nil
}