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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 (
    "fmt"
    "io"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/rlp"
)

type Log struct {
    // Consensus fields
    Address common.Address
    Topics  []common.Hash
    Data    []byte

    // Derived fields (don't reorder!)
    BlockNumber uint64
    TxHash      common.Hash
    TxIndex     uint
    BlockHash   common.Hash
    Index       uint
}

func NewLog(address common.Address, topics []common.Hash, data []byte, number uint64) *Log {
    return &Log{Address: address, Topics: topics, Data: data, BlockNumber: number}
}

func (l *Log) EncodeRLP(w io.Writer) error {
    return rlp.Encode(w, []interface{}{l.Address, l.Topics, l.Data})
}

func (l *Log) DecodeRLP(s *rlp.Stream) error {
    var log struct {
        Address common.Address
        Topics  []common.Hash
        Data    []byte
    }
    if err := s.Decode(&log); err != nil {
        return err
    }
    l.Address, l.Topics, l.Data = log.Address, log.Topics, log.Data
    return nil
}

func (l *Log) String() string {
    return fmt.Sprintf(`log: %x %x %x %x %d %x %d`, l.Address, l.Topics, l.Data, l.TxHash, l.TxIndex, l.BlockHash, l.Index)
}

type Logs []*Log

// LogForStorage is a wrapper around a Log that flattens and parses the entire
// content of a log, as opposed to only the consensus fields originally (by hiding
// the rlp interface methods).
type LogForStorage Log