// Copyright 2019 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 (
    "fmt"

    "github.com/ethereum/go-ethereum/params"
)

// EnableEIP enables the given EIP on the config.
// This operation writes in-place, and callers need to ensure that the globally
// defined jump tables are not polluted.
func EnableEIP(eipNum int, jt *JumpTable) error {
    switch eipNum {
    case 1884:
        enable1884(jt)
    case 1344:
        enable1344(jt)
    default:
        return fmt.Errorf("undefined eip %d", eipNum)
    }
    return nil
}

// enable1884 applies EIP-1884 to the given jump table:
// - Increase cost of BALANCE to 700
// - Increase cost of EXTCODEHASH to 700
// - Increase cost of SLOAD to 800
// - Define SELFBALANCE, with cost GasFastStep (5)
func enable1884(jt *JumpTable) {
    // Gas cost changes
    jt[BALANCE].constantGas = params.BalanceGasEIP1884
    jt[EXTCODEHASH].constantGas = params.ExtcodeHashGasEIP1884
    jt[SLOAD].constantGas = params.SloadGasEIP1884

    // New opcode
    jt[SELFBALANCE] = operation{
        execute:     opSelfBalance,
        constantGas: GasFastStep,
        minStack:    minStack(0, 1),
        maxStack:    maxStack(0, 1),
        valid:       true,
    }
}

func opSelfBalance(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
    balance := interpreter.intPool.get().Set(interpreter.evm.StateDB.GetBalance(contract.Address()))
    stack.push(balance)
    return nil, nil
}

// enable1344 applies EIP-1344 (ChainID Opcode)
// - Adds an opcode that returns the current chain’s EIP-155 unique identifier
func enable1344(jt *JumpTable) {
    // New opcode
    jt[CHAINID] = operation{
        execute:     opChainID,
        constantGas: GasQuickStep,
        minStack:    minStack(0, 1),
        maxStack:    maxStack(0, 1),
        valid:       true,
    }
}

// opChainID implements CHAINID opcode
func opChainID(pc *uint64, interpreter *EVMInterpreter, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
    chainId := interpreter.intPool.get().Set(interpreter.evm.chainConfig.ChainID)
    stack.push(chainId)
    return nil, nil
}