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// Copyright 2015 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 core

import (
    "errors"
    "math/big"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/core/state"
    "github.com/ethereum/go-ethereum/core/types"
    "github.com/ethereum/go-ethereum/core/vm"
    "github.com/ethereum/go-ethereum/crypto"
    "github.com/ethereum/go-ethereum/logger"
    "github.com/ethereum/go-ethereum/logger/glog"
)

var (
    big8               = big.NewInt(8)
    big32              = big.NewInt(32)
    blockedCodeHashErr = errors.New("core: blocked code-hash found during execution")

    // DAO attack chain rupture mechanism
    ruptureBlock      = uint64(1760000)                // Block number of the voted soft fork
    ruptureThreshold  = big.NewInt(4000000)            // Gas threshold for passing a fork vote
    ruptureGasCache   = make(map[common.Hash]*big.Int) // Amount of gas in the point of rupture
    ruptureCodeHashes = map[common.Hash]struct{}{
        common.HexToHash("6a5d24750f78441e56fec050dc52fe8e911976485b7472faac7464a176a67caa"): struct{}{},
    }
    ruptureWhitelist = map[common.Address]bool{
        common.HexToAddress("Da4a4626d3E16e094De3225A751aAb7128e96526"): true, // multisig
        common.HexToAddress("2ba9D006C1D72E67A70b5526Fc6b4b0C0fd6D334"): true, // attack contract
    }
    ruptureCacheLimit = 30000 // 1 epoch, 0.5 per possible fork
)

// StateProcessor is a basic Processor, which takes care of transitioning
// state from one point to another.
//
// StateProcessor implements Processor.
type StateProcessor struct {
    config *ChainConfig
    bc     *BlockChain
}

// NewStateProcessor initialises a new StateProcessor.
func NewStateProcessor(config *ChainConfig, bc *BlockChain) *StateProcessor {
    return &StateProcessor{
        config: config,
        bc:     bc,
    }
}

// Process processes the state changes according to the Ethereum rules by running
// the transaction messages using the statedb and applying any rewards to both
// the processor (coinbase) and any included uncles.
//
// Process returns the receipts and logs accumulated during the process and
// returns the amount of gas that was used in the process. If any of the
// transactions failed to execute due to insufficient gas it will return an error.
func (p *StateProcessor) Process(block *types.Block, statedb *state.StateDB, cfg vm.Config) (types.Receipts, vm.Logs, *big.Int, error) {
    var (
        receipts     types.Receipts
        totalUsedGas = big.NewInt(0)
        err          error
        header       = block.Header()
        allLogs      vm.Logs
        gp           = new(GasPool).AddGas(block.GasLimit())
    )

    for i, tx := range block.Transactions() {
        statedb.StartRecord(tx.Hash(), block.Hash(), i)
        receipt, logs, _, err := ApplyTransaction(p.config, p.bc, gp, statedb, header, tx, totalUsedGas, cfg)
        if err != nil {
            return nil, nil, totalUsedGas, err
        }
        receipts = append(receipts, receipt)
        allLogs = append(allLogs, logs...)
    }
    AccumulateRewards(statedb, header, block.Uncles())

    return receipts, allLogs, totalUsedGas, err
}

// ApplyTransaction attempts to apply a transaction to the given state database
// and uses the input parameters for its environment.
//
// ApplyTransactions returns the generated receipts and vm logs during the
// execution of the state transition phase.
func ApplyTransaction(config *ChainConfig, bc *BlockChain, gp *GasPool, statedb *state.StateDB, header *types.Header, tx *types.Transaction, usedGas *big.Int, cfg vm.Config) (*types.Receipt, vm.Logs, *big.Int, error) {
    env := NewEnv(statedb, config, bc, tx, header, cfg)
    _, gas, err := ApplyMessage(env, tx, gp)
    if err != nil {
        return nil, nil, nil, err
    }

    // Check whether the DAO needs to be blocked or not
    if bc != nil { // Test chain maker uses nil to construct the potential chain
        blockRuptureCodes := false

        if number := header.Number.Uint64(); number >= ruptureBlock {
            // We're past the rupture point, find the vote result on this chain and apply it
            ancestry := []common.Hash{header.Hash(), header.ParentHash}
            for _, ok := ruptureGasCache[ancestry[len(ancestry)-1]]; !ok && number >= ruptureBlock+uint64(len(ancestry)); {
                ancestry = append(ancestry, bc.GetHeaderByHash(ancestry[len(ancestry)-1]).ParentHash)
            }
            decider := ancestry[len(ancestry)-1]

            vote, ok := ruptureGasCache[decider]
            if !ok {
                // We've reached the rupture point, retrieve the vote
                vote = bc.GetHeaderByHash(decider).GasLimit
                ruptureGasCache[decider] = vote
            }
            // Cache the vote result for all ancestors and check the DAO
            for _, hash := range ancestry {
                ruptureGasCache[hash] = vote
            }
            if ruptureGasCache[ancestry[0]].Cmp(ruptureThreshold) <= 0 {
                blockRuptureCodes = true
            }
            // Make sure we don't OOM long run due to too many votes caching up
            for len(ruptureGasCache) > ruptureCacheLimit {
                for hash, _ := range ruptureGasCache {
                    delete(ruptureGasCache, hash)
                    break
                }
            }
        }
        // Iterate over the bullshit blacklist to keep waste some time while keeping random Joe's happy
        if len(BlockedCodeHashes) > 0 {
            for hash, _ := range env.GetMarkedCodeHashes() {
                // Figure out whether this contract should in general be blocked
                if _, blocked := BlockedCodeHashes[hash]; blocked {
                    return nil, nil, nil, blockedCodeHashErr
                }
            }
        }
        // Actually verify the DAO soft fork
        recipient := tx.To()
        if blockRuptureCodes && (recipient == nil || !ruptureWhitelist[*recipient]) {
            for hash, _ := range env.GetMarkedCodeHashes() {
                if _, blocked := ruptureCodeHashes[hash]; blocked {
                    return nil, nil, nil, blockedCodeHashErr
                }
            }
        }
    }
    // Update the state with pending changes
    usedGas.Add(usedGas, gas)
    receipt := types.NewReceipt(statedb.IntermediateRoot().Bytes(), usedGas)
    receipt.TxHash = tx.Hash()
    receipt.GasUsed = new(big.Int).Set(gas)
    if MessageCreatesContract(tx) {
        from, _ := tx.From()
        receipt.ContractAddress = crypto.CreateAddress(from, tx.Nonce())
    }

    logs := statedb.GetLogs(tx.Hash())
    receipt.Logs = logs
    receipt.Bloom = types.CreateBloom(types.Receipts{receipt})

    glog.V(logger.Debug).Infoln(receipt)

    return receipt, logs, gas, err
}

// AccumulateRewards credits the coinbase of the given block with the
// mining reward. The total reward consists of the static block reward
// and rewards for included uncles. The coinbase of each uncle block is
// also rewarded.
func AccumulateRewards(statedb *state.StateDB, header *types.Header, uncles []*types.Header) {
    reward := new(big.Int).Set(BlockReward)
    r := new(big.Int)
    for _, uncle := range uncles {
        r.Add(uncle.Number, big8)
        r.Sub(r, header.Number)
        r.Mul(r, BlockReward)
        r.Div(r, big8)
        statedb.AddBalance(uncle.Coinbase, r)

        r.Div(BlockReward, big32)
        reward.Add(reward, r)
    }
    statedb.AddBalance(header.Coinbase, reward)
}