// Copyright 2017 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 ethconfig contains the configuration of the ETH and LES protocols.
package ethconfig

import (
	"math/big"
	"os"
	"os/user"
	"path/filepath"
	"runtime"
	"time"

	"github.com/XinFinOrg/XDPoSChain/common"
	"github.com/XinFinOrg/XDPoSChain/common/hexutil"
	"github.com/XinFinOrg/XDPoSChain/consensus/ethash"
	"github.com/XinFinOrg/XDPoSChain/core"
	"github.com/XinFinOrg/XDPoSChain/core/txpool"
	"github.com/XinFinOrg/XDPoSChain/eth/downloader"
	"github.com/XinFinOrg/XDPoSChain/eth/gasprice"
	"github.com/XinFinOrg/XDPoSChain/params"
)

// FullNodeGPO contains default gasprice oracle settings for full node.
var FullNodeGPO = gasprice.Config{
	Blocks:           20,
	Percentile:       60,
	MaxHeaderHistory: 1024,
	MaxBlockHistory:  1024,
	MaxPrice:         gasprice.DefaultMaxPrice,
	IgnorePrice:      gasprice.DefaultIgnorePrice,
}

// Defaults contains default settings for use on the Ethereum main net.
var Defaults = Config{
	SyncMode: downloader.FullSync,
	Ethash: ethash.Config{
		CacheDir:       "ethash",
		CachesInMem:    2,
		CachesOnDisk:   3,
		DatasetsInMem:  1,
		DatasetsOnDisk: 2,
	},
	NetworkId:          0, // enable auto configuration of networkID == chainID
	LightPeers:         100,
	DatabaseCache:      768,
	TrieCache:          256,
	TrieTimeout:        5 * time.Minute,
	FilterLogCacheSize: 32,
	GasPrice:           big.NewInt(0.25 * params.Shannon),

	TxPool:      txpool.DefaultConfig,
	RPCGasCap:   50000000,
	GPO:         FullNodeGPO,
	RPCTxFeeCap: 1, // 1 ether
}

func init() {
	home := os.Getenv("HOME")
	if home == "" {
		if user, err := user.Current(); err == nil {
			home = user.HomeDir
		}
	}
	if runtime.GOOS == "darwin" {
		Defaults.Ethash.DatasetDir = filepath.Join(home, "Library", "Ethash")
	} else if runtime.GOOS == "windows" {
		localappdata := os.Getenv("LOCALAPPDATA")
		if localappdata != "" {
			Defaults.Ethash.DatasetDir = filepath.Join(localappdata, "Ethash")
		} else {
			Defaults.Ethash.DatasetDir = filepath.Join(home, "AppData", "Local", "Ethash")
		}
	} else {
		Defaults.Ethash.DatasetDir = filepath.Join(home, ".ethash")
	}
}

//go:generate go run github.com/fjl/gencodec -type Config -field-override configMarshaling -formats toml -out gen_config.go

// Config contains configuration options for of the ETH and LES protocols.
type Config struct {
	// The genesis block, which is inserted if the database is empty.
	// If nil, the Ethereum main net block is used.
	Genesis *core.Genesis `toml:",omitempty"`

	// Network ID separates blockchains on the peer-to-peer networking level. When left
	// zero, the chain ID is used as network ID.
	NetworkId uint64
	SyncMode  downloader.SyncMode
	NoPruning bool

	// Light client options
	LightServ  int `toml:",omitempty"` // Maximum percentage of time allowed for serving LES requests
	LightPeers int `toml:",omitempty"` // Maximum number of LES client peers

	// Database options
	SkipBcVersionCheck bool `toml:"-"`
	DatabaseHandles    int  `toml:"-"`
	DatabaseCache      int
	TrieCache          int
	TrieTimeout        time.Duration

	// This is the number of blocks for which logs will be cached in the filter system.
	FilterLogCacheSize int

	// Mining-related options
	Etherbase    common.Address `toml:",omitempty"`
	MinerThreads int            `toml:",omitempty"`
	ExtraData    []byte         `toml:",omitempty"`
	GasPrice     *big.Int

	// Ethash options
	Ethash ethash.Config

	// Transaction pool options
	TxPool txpool.Config

	// Gas Price Oracle options
	GPO gasprice.Config

	// Enables tracking of SHA3 preimages in the VM
	EnablePreimageRecording bool

	// Miscellaneous options
	DocRoot string `toml:"-"`

	// RPCGasCap is the global gas cap for eth-call variants.
	RPCGasCap uint64

	// RPCTxFeeCap is the global transaction fee(price * gaslimit) cap for
	// send-transction variants. The unit is ether.
	RPCTxFeeCap float64
}

type configMarshaling struct {
	ExtraData hexutil.Bytes
}