vmcommon

type AcceptPayableHandler interface {
	SetPayableHandler(payableHandler PayableHandler) error
	IsInterfaceNil() bool
}

type AccountDataHandler interface {
	RetrieveValue(key []byte) ([]byte, error)
	SaveKeyValue(key []byte, value []byte) error
	IsInterfaceNil() bool
}

type AccountHandler interface {
	AddressBytes() []byte
	IncreaseNonce(nonce uint64)
	GetNonce() uint64
	IsInterfaceNil() bool
}

type AccountsAdapter interface {
	GetExistingAccount(address []byte) (AccountHandler, error)
	LoadAccount(address []byte) (AccountHandler, error)
	SaveAccount(account AccountHandler) error
	RemoveAccount(address []byte) error
	Commit() ([]byte, error)
	JournalLen() int
	RevertToSnapshot(snapshot int) error
	GetNumCheckpoints() uint32
	GetCode(codeHash []byte) []byte

	RootHash() ([]byte, error)
	RecreateTrie(rootHash []byte) error
	IsInterfaceNil() bool
}

type BaseOperationCost struct {
	StorePerByte      uint64
	ReleasePerByte    uint64
	DataCopyPerByte   uint64
	PersistPerByte    uint64
	CompilePerByte    uint64
	AoTPreparePerByte uint64
}

type BlockchainHook interface {
	// NewAddress yields the address of a new SC account, when one such account is created.
	// The result should only depend on the creator address and nonce.
	// Returning an empty address lets the VM decide what the new address should be.
	NewAddress(creatorAddress []byte, creatorNonce uint64, vmType []byte) ([]byte, error)

	// GetStorageData should yield the storage value for a certain account and index.
	// Should return an empty byte array if the key is missing from the account storage,
	// or if account does not exist.
	GetStorageData(accountAddress []byte, index []byte) ([]byte, error)

	// GetBlockhash returns the hash of the block with the asked nonce if available
	GetBlockhash(nonce uint64) ([]byte, error)

	// LastNonce returns the nonce from from the last committed block
	LastNonce() uint64

	// LastRound returns the round from the last committed block
	LastRound() uint64

	// LastTimeStamp returns the timeStamp from the last committed block
	LastTimeStamp() uint64

	// LastRandomSeed returns the random seed from the last committed block
	LastRandomSeed() []byte

	// LastEpoch returns the epoch from the last committed block
	LastEpoch() uint32

	// GetStateRootHash returns the state root hash from the last committed block
	GetStateRootHash() []byte

	// CurrentNonce returns the nonce from the current block
	CurrentNonce() uint64

	// CurrentRound returns the round from the current block
	CurrentRound() uint64

	// CurrentTimeStamp return the timestamp from the current block
	CurrentTimeStamp() uint64

	// CurrentRandomSeed returns the random seed from the current header
	CurrentRandomSeed() []byte

	// CurrentEpoch returns the current epoch
	CurrentEpoch() uint32

	// ProcessBuiltInFunction will process the builtIn function for the created input
	ProcessBuiltInFunction(input *ContractCallInput) (*VMOutput, error)

	// GetBuiltinFunctionNames returns the names of protocol built-in functions
	GetBuiltinFunctionNames() FunctionNames

	// GetAllState returns the full state of the account, all the key-value saved
	GetAllState(address []byte) (map[string][]byte, error)

	// GetUserAccount returns a user account
	GetUserAccount(address []byte) (UserAccountHandler, error)

	// GetCode returns the code for the given account
	GetCode(UserAccountHandler) []byte

	// GetShardOfAddress returns the shard ID of a given address
	GetShardOfAddress(address []byte) uint32

	// IsSmartContract returns whether the address points to a smart contract
	IsSmartContract(address []byte) bool

	// IsPayable checks weather the provided address can receive MOA or not
	IsPayable(address []byte) (bool, error)

	// SaveCompiledCode saves to cache and storage the compiled code
	SaveCompiledCode(codeHash []byte, code []byte)

	// GetCompiledCode returns the compiled code if it finds in the cache or storage
	GetCompiledCode(codeHash []byte) (bool, []byte)

	// ClearCompiledCodes clears the cache and storage of compiled codes
	ClearCompiledCodes()

	// GetDCTToken loads the DCT digital token for the given key
	GetDCTToken(address []byte, tokenID []byte, nonce uint64) (*dct.DCToken, error)

	// GetSnapshot gets the number of entries in the journal as a snapshot id
	GetSnapshot() int

	// RevertToSnapshot reverts snaphots up to the specified one
	RevertToSnapshot(snapshot int) error

	// IsInterfaceNil returns true if there is no value under the interface
	IsInterfaceNil() bool
}

type BuiltInCost struct {
	ChangeOwnerAddress      uint64
	ClaimDeveloperRewards   uint64
	SaveUserName            uint64
	SaveKeyValue            uint64
	DCTTransfer             uint64
	DCTBurn                 uint64
	DCTLocalMint            uint64
	DCTLocalBurn            uint64
	DCTNFTCreate            uint64
	DCTNFTAddQuantity       uint64
	DCTNFTBurn              uint64
	DCTNFTTransfer          uint64
	DCTNFTChangeCreateOwner uint64
	DCTNFTMultiTransfer     uint64
	DCTNFTAddURI            uint64
	DCTNFTUpdateAttributes  uint64
}

type BuiltInFunctionContainer interface {
	Get(key string) (BuiltinFunction, error)
	Add(key string, function BuiltinFunction) error
	Replace(key string, function BuiltinFunction) error
	Remove(key string)
	Len() int
	Keys() map[string]struct{}
	IsInterfaceNil() bool
}

type BuiltinFunction interface {
	ProcessBuiltinFunction(acntSnd, acntDst UserAccountHandler, vmInput *ContractCallInput) (*VMOutput, error)
	SetNewGasConfig(gasCost *GasCost)
	IsActive() bool
	IsInterfaceNil() bool
}

type CallType int

type CodeMetadata struct {
	Payable     bool
	Upgradeable bool
	Readable    bool
}

type ContractCallInput struct {
	VMInput

	// RecipientAddr is the smart contract public key, "to".
	RecipientAddr []byte

	// Function is the name of the smart contract function that will be called.
	// The function must be public
	Function string

	// AllowInitFunction specifies whether calling the initialization method of
	// the smart contract is allowed or not
	AllowInitFunction bool
}

type ContractCreateInput struct {
	VMInput

	// ContractCode is the code of the contract being created, assembled into a byte array.
	ContractCode []byte

	// ContractCodeMetadata is the code metadata of the contract being created.
	ContractCodeMetadata []byte
}

type Coordinator interface {
	NumberOfShards() uint32
	ComputeId(address []byte) uint32
	SelfId() uint32
	SameShard(firstAddress, secondAddress []byte) bool
	CommunicationIdentifier(destShardID uint32) string
	IsInterfaceNil() bool
}

type CryptoHook interface {
	// Sha256 cryptographic function
	Sha256(data []byte) ([]byte, error)

	// Keccak256 cryptographic function
	Keccak256(data []byte) ([]byte, error)

	// Ripemd160 cryptographic function
	Ripemd160(data []byte) ([]byte, error)

	// Ecrecover calculates the corresponding Ethereum address for the public key which created the given signature
	// https://ewasm.readthedocs.io/en/mkdocs/system_contracts/
	Ecrecover(hash []byte, recoveryID []byte, r []byte, s []byte) ([]byte, error)

	// IsInterfaceNil returns true if there is no value under the interface
	IsInterfaceNil() bool
}

type DCTPauseHandler interface {
	IsPaused(token []byte) bool
	IsInterfaceNil() bool
}

type DCTRoleHandler interface {
	CheckAllowedToExecute(account UserAccountHandler, tokenID []byte, action []byte) error
	IsInterfaceNil() bool
}

type DCTTransfer struct {
	// DCTValue is the value (amount of tokens) transferred by the transaction.
	// Before reaching the VM this value is subtracted from sender balance (CallerAddr)
	// and to added to the smart contract balance.
	// It is often, but not always zero in SC calls.
	DCTValue *big.Int

	// DCTTokenName is the name of the token which was transferred by the transaction to the SC
	DCTTokenName []byte

	// DCTTokenType is the type of the transferred token
	DCTTokenType uint32

	// DCTTokenNonce is the nonce for the given NFT token
	DCTTokenNonce uint64
}

type DCTTransferParser interface {
	ParseDCTTransfers(sndAddr []byte, rcvAddr []byte, function string, args [][]byte) (*ParsedDCTTransfers, error)
	IsInterfaceNil() bool
}

type DCTType uint32

type EpochNotifier interface {
	RegisterNotifyHandler(handler EpochSubscriberHandler)
	IsInterfaceNil() bool
}

type EpochSubscriberHandler interface {
	EpochConfirmed(epoch uint32, timestamp uint64)
	IsInterfaceNil() bool
}

type FunctionNames = map[string]struct{}

type GasCost struct {
	BaseOperationCost BaseOperationCost
	BuiltInCost       BuiltInCost
}

type LogEntry struct {
	Identifier []byte
	Address    []byte
	Topics     [][]byte
	Data       []byte
}

type Marshalizer interface {
	Marshal(obj interface{}) ([]byte, error)
	Unmarshal(obj interface{}, buff []byte) error
	IsInterfaceNil() bool
}

type OutputAccount struct {
	// Address is the public key of the account.
	Address []byte

	// Nonce is the new account nonce.
	Nonce uint64

	// Balance is the account balance after running a SC.
	// Only used for some tests now, please ignore. Might be removed in the future.
	Balance *big.Int

	// StorageUpdates is a map containing pointers to StorageUpdate structs,
	// indexed with strings produced by `string(StorageUpdate.Offset)`, for fast
	// access by the Offset of the StorageUpdate. These StorageUpdate structs
	// will be processed by the Node to modify the storage of the SmartContract.
	// Please note that it is likely that not all existing account storage keys
	// show up here.
	StorageUpdates map[string]*StorageUpdate

	// Code is the assembled code of a smart contract account.
	// This field will be populated when a new SC must be created after the transaction.
	Code []byte

	// CodeMetadata is the metadata of the code
	// Like "Code", this field will be populated when a new SC must be created after the transaction.
	CodeMetadata []byte

	// CodeDeployerAddress will be populated in case of contract deployment or upgrade (both direct and indirect)
	CodeDeployerAddress []byte

	// BalanceDelta is by how much the balance should change following the SC execution.
	// A negative value indicates that balance should decrease.
	BalanceDelta *big.Int

	// OutputTransfers represents the cross shard calls for this account
	OutputTransfers []OutputTransfer

	// GasUsed will be populated if the contract was called in the same shard
	GasUsed uint64
}

type OutputTransfer struct {
	// Value to be transferred
	Value *big.Int
	// GasLimit to used for the call
	GasLimit uint64
	// GasLocked holds the amount of gas to be kept aside for the eventual callback execution
	GasLocked uint64
	// Data to be used in cross call
	Data []byte
	// CallType is set if it is a smart contract invocation
	CallType CallType
	// SenderAddress is the actual sender for the given output transfer, this is needed when
	// contract A calls contract B and contract B does the transfers
	SenderAddress []byte
}

type ParsedDCTTransfers struct {
	DCTTransfers []*DCTTransfer
	RcvAddr      []byte
	CallFunction string
	CallArgs     [][]byte
}

type PayableHandler interface {
	IsPayable(address []byte) (bool, error)
	IsInterfaceNil() bool
}

type ReturnCode int

type ReturnDataKind int

type StorageUpdate struct {
	// Offset is the storage key.
	// The VM treats this as a big.Int.
	Offset []byte

	// Data is the new storage value.
	// The VM treats this as a big.Int.
	// Zero indicates missing data for the key (or even a missing key),
	// therefore a value of zero here indicates that
	// the storage map entry with the given key can be deleted.
	Data []byte
}

type UserAccountHandler interface {
	GetCodeMetadata() []byte
	GetCodeHash() []byte
	GetRootHash() []byte
	AccountDataHandler() AccountDataHandler
	AddToBalance(value *big.Int) error
	GetBalance() *big.Int
	ClaimDeveloperRewards([]byte) (*big.Int, error)
	GetDeveloperReward() *big.Int
	ChangeOwnerAddress([]byte, []byte) error
	SetOwnerAddress([]byte)
	GetOwnerAddress() []byte
	SetUserName(userName []byte)
	GetUserName() []byte
	AccountHandler
}

type VMExecutionHandler interface {
	// RunSmartContractCreate computes how a smart contract creation should be performed
	RunSmartContractCreate(input *ContractCreateInput) (*VMOutput, error)

	// RunSmartContractCall computes the result of a smart contract call and how the system must change after the execution
	RunSmartContractCall(input *ContractCallInput) (*VMOutput, error)

	// GasScheduleChange sets a new gas schedule for the VM
	GasScheduleChange(newGasSchedule map[string]map[string]uint64)

	// GetVersion returns the version of the VM instance
	GetVersion() string

	// IsInterfaceNil returns true if there is no value under the interface
	IsInterfaceNil() bool
}

type VMInput struct {
	// CallerAddr is the public key of the wallet initiating the transaction, "from".
	CallerAddr []byte

	// Arguments are the call parameters to the smart contract function call
	// For contract creation, these are the parameters to the @init function.
	// For contract call, these are the parameters to the function referenced in ContractCallInput.Function.
	// If the number of arguments does not match the function arity,
	// the transaction will return FunctionWrongSignature ReturnCode.
	Arguments [][]byte

	// CallValue is the mOA value (amount of tokens) transferred by the transaction.
	// Before reaching the VM this value is subtracted from sender balance (CallerAddr)
	// and to added to the smart contract balance.
	// It is often, but not always zero in SC calls.
	CallValue *big.Int

	// CallType is the type of SmartContract call
	// Based on this value, the VM is informed of whether the call is direct,
	// asynchronous, or asynchronous callback.
	CallType CallType

	// GasPrice multiplied by the gas burned by the transaction yields the transaction fee.
	// A larger GasPrice will incentivize block proposers to include the transaction in a block sooner,
	// but will cost the sender more.
	// The total fee should be GasPrice x (GasProvided - VMOutput.GasRemaining - VMOutput.GasRefund).
	// Note: the order of operations on the sender balance is:
	// 1. subtract GasPrice x GasProvided
	// 2. call VM, which will subtract CallValue if enough funds remain
	// 3. reimburse GasPrice x (VMOutput.GasRemaining + VMOutput.GasRefund)
	GasPrice uint64

	// GasProvided is the maximum gas allowed for the smart contract execution.
	// If the transaction consumes more gas than this value, it will immediately terminate
	// and return OutOfGas ReturnCode.
	// The sender will not be charged based on GasProvided, only on the gas burned,
	// so it doesn't cost the sender more to have a higher gas limit.
	GasProvided uint64

	// GasLocked is the amount of gas that must be kept unused during the current
	// call, because it will be used later for a callback. This field is only
	// used during asynchronous calls.
	GasLocked uint64

	// OriginalTxHash
	OriginalTxHash []byte

	// CurrentTxHash
	CurrentTxHash []byte

	// PrevTxHash
	PrevTxHash []byte

	// DCTTransfers
	DCTTransfers []*DCTTransfer

	// ReturnCallAfterError
	ReturnCallAfterError bool
}

type VMOutput struct {
	// ReturnData is the function call returned result.
	// This value does not influence the account state in any way.
	// The value should be accessible in a UI.
	// ReturnData is part of the transaction receipt.
	ReturnData [][]byte

	// ReturnCode is the function call error code.
	// If it is not `Ok`, the transaction failed in some way - gas is, however, consumed anyway.
	// This value does not influence the account state in any way.
	// The value should be accessible to a UI.
	// ReturnCode is part of the transaction receipt.
	ReturnCode ReturnCode

	// ReturnMessage is a message set by the SmartContract, destined for the
	// caller
	ReturnMessage string

	// GasRemaining = VMInput.GasProvided - gas used.
	// It is necessary to compute how much to charge the sender for the transaction.
	GasRemaining uint64

	// GasRefund is how much gas the sender earned during the transaction.
	// Certain operations, like freeing up storage, actually return gas instead of consuming it.
	// Based on GasRefund, the sender could in principle be rewarded instead of taxed.
	GasRefund *big.Int

	// OutputAccounts contains data about all accounts changed as a result of the
	// Transaction. It is a map containing pointers to OutputAccount structs,
	// indexed with strings produced by `string(OutputAccount.Address)`, for fast
	// access by the Address of the OutputAccount.
	// This information tells the Node how to update the account data.
	// It can contain new accounts or existing changed accounts.
	// Note: the current implementation might also retrieve accounts that were not changed.
	OutputAccounts map[string]*OutputAccount

	// DeletedAccounts is a list of public keys of accounts that need to be deleted
	// as a result of the transaction.
	DeletedAccounts [][]byte

	// TouchedAccounts is a list of public keys of accounts that were somehow involved in the VM execution.
	// TODO: investigate what we need to to about these.
	TouchedAccounts [][]byte

	// Logs is a list of event data logged by the vmcommon.
	// Smart contracts can choose to log certain events programatically.
	// There are 3 main use cases for events and logs:
	// 1. smart contract return values for the user interface;
	// 2. asynchronous triggers with data;
	// 3. a cheaper form of storage (e.g. storing historical data that can be rendered by the frontend).
	// The logs should be accessible to the UI.
	// The logs are part of the transaction receipt.
	Logs []*LogEntry
}