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// Copyright 2014 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package vm

import (
    "math/big"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/core/types"
)

// StateDB is an EVM database for full state querying.
type StateDB interface {
    GetAccount(common.Address) Account
    CreateAccount(common.Address) Account

    SubBalance(common.Address, *big.Int)
    AddBalance(common.Address, *big.Int)
    GetBalance(common.Address) *big.Int

    GetNonce(common.Address) uint64
    SetNonce(common.Address, uint64)

    GetCodeHash(common.Address) common.Hash
    GetCode(common.Address) []byte
    SetCode(common.Address, []byte)
    GetCodeSize(common.Address) int

    AddRefund(*big.Int)
    GetRefund() *big.Int

    GetState(common.Address, common.Hash) common.Hash
    SetState(common.Address, common.Hash, common.Hash)

    Suicide(common.Address) bool
    HasSuicided(common.Address) bool

    // Exist reports whether the given account exists in state.
    // Notably this should also return true for suicided accounts.
    Exist(common.Address) bool
    // Empty returns whether the given account is empty. Empty
    // is defined according to EIP161 (balance = nonce = code = 0).
    Empty(common.Address) bool

    RevertToSnapshot(int)
    Snapshot() int

    AddLog(*types.Log)
    AddPreimage(common.Hash, []byte)
}

// Account represents a contract or basic ethereum account.
type Account interface {
    SubBalance(amount *big.Int)
    AddBalance(amount *big.Int)
    SetBalance(*big.Int)
    SetNonce(uint64)
    Balance() *big.Int
    Address() common.Address
    ReturnGas(*big.Int)
    SetCode(common.Hash, []byte)
    ForEachStorage(cb func(key, value common.Hash) bool)
    Value() *big.Int
}

// CallContext provides a basic interface for the EVM calling conventions. The EVM EVM
// depends on this context being implemented for doing subcalls and initialising new EVM contracts.
type CallContext interface {
    // Call another contract
    Call(env *EVM, me ContractRef, addr common.Address, data []byte, gas, value *big.Int) ([]byte, error)
    // Take another's contract code and execute within our own context
    CallCode(env *EVM, me ContractRef, addr common.Address, data []byte, gas, value *big.Int) ([]byte, error)
    // Same as CallCode except sender and value is propagated from parent to child scope
    DelegateCall(env *EVM, me ContractRef, addr common.Address, data []byte, gas *big.Int) ([]byte, error)
    // Create a new contract
    Create(env *EVM, me ContractRef, data []byte, gas, value *big.Int) ([]byte, common.Address, error)
}