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// Copyright 2018 The dexon-consensus Authors
// This file is part of the dexon-consensus library.
//
// The dexon-consensus 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 dexon-consensus 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 dexon-consensus library. If not, see
// <http://www.gnu.org/licenses/>.

package types

import (
    "encoding/binary"
    "time"
)

// Config stands for Current Configuration Parameters.
type Config struct {
    // Lambda related.
    LambdaBA  time.Duration
    LambdaDKG time.Duration

    // Set related.
    NotarySetSize uint32

    // Time related.
    RoundLength      uint64
    MinBlockInterval time.Duration
}

// Clone return a copied configuration.
func (c *Config) Clone() *Config {
    return &Config{
        LambdaBA:         c.LambdaBA,
        LambdaDKG:        c.LambdaDKG,
        NotarySetSize:    c.NotarySetSize,
        RoundLength:      c.RoundLength,
        MinBlockInterval: c.MinBlockInterval,
    }
}

// Bytes returns []byte representation of Config.
func (c *Config) Bytes() []byte {
    binaryLambdaBA := make([]byte, 8)
    binary.LittleEndian.PutUint64(
        binaryLambdaBA, uint64(c.LambdaBA.Nanoseconds()))
    binaryLambdaDKG := make([]byte, 8)
    binary.LittleEndian.PutUint64(
        binaryLambdaDKG, uint64(c.LambdaDKG.Nanoseconds()))

    binaryNotarySetSize := make([]byte, 4)
    binary.LittleEndian.PutUint32(binaryNotarySetSize, c.NotarySetSize)

    binaryRoundLength := make([]byte, 8)
    binary.LittleEndian.PutUint64(binaryRoundLength, c.RoundLength)
    binaryMinBlockInterval := make([]byte, 8)
    binary.LittleEndian.PutUint64(binaryMinBlockInterval,
        uint64(c.MinBlockInterval.Nanoseconds()))

    enc := make([]byte, 0, 40)
    enc = append(enc, binaryLambdaBA...)
    enc = append(enc, binaryLambdaDKG...)
    enc = append(enc, binaryNotarySetSize...)
    enc = append(enc, binaryRoundLength...)
    enc = append(enc, binaryMinBlockInterval...)
    return enc
}