// Copyright 2016 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 params

import (
	"encoding/binary"
	"fmt"
	"math/big"

	"github.com/ethereum/go-ethereum/common"
	"golang.org/x/crypto/sha3"
)

// Genesis hashes to enforce below configs on.
var (
	FastexChainTestnetGenesisHash = common.HexToHash("0x483cd7dad79c4ae149a2d80dd1214c7efaf32cbdbccccedcdee6a48c371f9a86")

	// FastexChain
	MainnetGenesisHash = common.HexToHash("0xa247449db20cd92bea43afffcba1efcf05f4ef24413e87b98dfd5c40b915960d")
	OasisGenesisHash   = common.HexToHash("0xcb0e559064b972e715f30a2c59788e077c3a3966e99de9478a092a7c2cf7c4b3")

	RopstenGenesisHash = common.HexToHash("0x41941023680923e0fe4d74a34bdac8141f2540e3ae90623718e47d66d1ca4a2d")
	SepoliaGenesisHash = common.HexToHash("0x25a5cc106eea7138acab33231d7160d69cb777ee0c2c553fcddf5138993e6dd9")
	RinkebyGenesisHash = common.HexToHash("0x6341fd3daf94b748c72ced5a5b26028f2474f5f00d824504e4fa37a75767e177")
	GoerliGenesisHash  = common.HexToHash("0xbf7e331f7f7c1dd2e05159666b3bf8bc7a8a3a9eb1d518969eab529dd9b88c1a")
	KilnGenesisHash    = common.HexToHash("0x51c7fe41be669f69c45c33a56982cbde405313342d9e2b00d7c91a7b284dd4f8")
)

// TrustedCheckpoints associates each known checkpoint with the genesis hash of
// the chain it belongs to.
var TrustedCheckpoints = map[common.Hash]*TrustedCheckpoint{
	// MainnetGenesisHash: MainnetTrustedCheckpoint,
	RopstenGenesisHash: RopstenTrustedCheckpoint,
	SepoliaGenesisHash: SepoliaTrustedCheckpoint,
	RinkebyGenesisHash: RinkebyTrustedCheckpoint,
	GoerliGenesisHash:  GoerliTrustedCheckpoint,
}

// CheckpointOracles associates each known checkpoint oracles with the genesis hash of
// the chain it belongs to.
var CheckpointOracles = map[common.Hash]*CheckpointOracleConfig{
	// MainnetGenesisHash: MainnetCheckpointOracle,
	RopstenGenesisHash: RopstenCheckpointOracle,
	RinkebyGenesisHash: RinkebyCheckpointOracle,
	GoerliGenesisHash:  GoerliCheckpointOracle,
}

var (
	FastexTestnetConfig = &ChainConfig{
		ChainID:                       big.NewInt(4090),
		HomesteadBlock:                big.NewInt(0),
		DAOForkBlock:                  big.NewInt(0),
		DAOForkSupport:                true,
		EIP150Block:                   big.NewInt(0),
		EIP150Hash:                    common.HexToHash("0x0000000000000000000000000000000000000000000000000000000000000000"),
		EIP155Block:                   big.NewInt(0),
		EIP158Block:                   big.NewInt(0),
		ByzantiumBlock:                big.NewInt(0),
		ConstantinopleBlock:           big.NewInt(0),
		PetersburgBlock:               big.NewInt(0),
		IstanbulBlock:                 big.NewInt(0),
		MuirGlacierBlock:              big.NewInt(0),
		BerlinBlock:                   big.NewInt(0),
		LondonBlock:                   big.NewInt(0),
		ArrowGlacierBlock:             big.NewInt(0),
		GrayGlacierBlock:              big.NewInt(0),
		TerminalTotalDifficultyPassed: false,
		Clique: &CliqueConfig{
			Period: 12,
			Epoch:  30000,
		},
	}

	MainnetTerminalTotalDifficulty *big.Int

	// MainnetChainConfig is the chain parameters to run a node on the main network.
	MainnetChainConfig = &ChainConfig{
		ChainID:                       big.NewInt(5165),
		HomesteadBlock:                big.NewInt(0),
		DAOForkBlock:                  nil,
		DAOForkSupport:                true,
		EIP150Block:                   big.NewInt(0),
		EIP150Hash:                    common.HexToHash("0x0000000000000000000000000000000000000000000000000000000000000000"),
		EIP155Block:                   big.NewInt(0),
		EIP158Block:                   big.NewInt(0),
		ByzantiumBlock:                big.NewInt(0),
		ConstantinopleBlock:           big.NewInt(0),
		PetersburgBlock:               big.NewInt(0),
		IstanbulBlock:                 big.NewInt(0),
		MuirGlacierBlock:              big.NewInt(0),
		BerlinBlock:                   big.NewInt(0),
		LondonBlock:                   big.NewInt(0),
		FCIP2Block:                    big.NewInt(536562), // 2023-07-12 08:00:07 UTC
		TerminalTotalDifficulty:       MainnetTerminalTotalDifficulty,
		TerminalTotalDifficultyPassed: false,
		Clique: &CliqueConfig{
			Period: 12,
			Epoch:  30000,
		},
	}

	// MainnetTrustedCheckpoint contains the light client trusted checkpoint for the main network.
	MainnetTrustedCheckpoint = &TrustedCheckpoint{}

	// MainnetCheckpointOracle contains a set of configs for the main network oracle.
	MainnetCheckpointOracle = &CheckpointOracleConfig{}

	OasisChainConfig = &ChainConfig{
		ChainID:                       big.NewInt(4090),
		HomesteadBlock:                big.NewInt(0),
		DAOForkBlock:                  nil,
		DAOForkSupport:                true,
		EIP150Block:                   big.NewInt(0),
		EIP150Hash:                    common.HexToHash("0x0000000000000000000000000000000000000000000000000000000000000000"),
		EIP155Block:                   big.NewInt(0),
		EIP158Block:                   big.NewInt(0),
		ByzantiumBlock:                big.NewInt(0),
		ConstantinopleBlock:           big.NewInt(0),
		PetersburgBlock:               big.NewInt(0),
		IstanbulBlock:                 big.NewInt(0),
		MuirGlacierBlock:              big.NewInt(0),
		BerlinBlock:                   big.NewInt(0),
		LondonBlock:                   big.NewInt(0),
		FCIP2Block:                    big.NewInt(372600), // 2023-06-23 09:03:12 UTC
		TerminalTotalDifficultyPassed: false,
		Clique: &CliqueConfig{
			Period: 12,
			Epoch:  30000,
		},
	}

	// RopstenChainConfig contains the chain parameters to run a node on the Ropsten test network.
	RopstenChainConfig = &ChainConfig{
		ChainID:                       big.NewInt(3),
		HomesteadBlock:                big.NewInt(0),
		DAOForkBlock:                  nil,
		DAOForkSupport:                true,
		EIP150Block:                   big.NewInt(0),
		EIP150Hash:                    common.HexToHash("0x41941023680923e0fe4d74a34bdac8141f2540e3ae90623718e47d66d1ca4a2d"),
		EIP155Block:                   big.NewInt(10),
		EIP158Block:                   big.NewInt(10),
		ByzantiumBlock:                big.NewInt(1_700_000),
		ConstantinopleBlock:           big.NewInt(4_230_000),
		PetersburgBlock:               big.NewInt(4_939_394),
		IstanbulBlock:                 big.NewInt(6_485_846),
		MuirGlacierBlock:              big.NewInt(7_117_117),
		BerlinBlock:                   big.NewInt(9_812_189),
		LondonBlock:                   big.NewInt(10_499_401),
		TerminalTotalDifficulty:       new(big.Int).SetUint64(50_000_000_000_000_000),
		TerminalTotalDifficultyPassed: true,
		Ethash:                        new(EthashConfig),
	}

	// RopstenTrustedCheckpoint contains the light client trusted checkpoint for the Ropsten test network.
	RopstenTrustedCheckpoint = &TrustedCheckpoint{
		SectionIndex: 346,
		SectionHead:  common.HexToHash("0xafa0384ebd13a751fb7475aaa7fc08ac308925c8b2e2195bca2d4ab1878a7a84"),
		CHTRoot:      common.HexToHash("0x522ae1f334bfa36033b2315d0b9954052780700b69448ecea8d5877e0f7ee477"),
		BloomRoot:    common.HexToHash("0x4093fd53b0d2cc50181dca353fe66f03ae113e7cb65f869a4dfb5905de6a0493"),
	}

	// RopstenCheckpointOracle contains a set of configs for the Ropsten test network oracle.
	RopstenCheckpointOracle = &CheckpointOracleConfig{
		Address: common.HexToAddress("0xEF79475013f154E6A65b54cB2742867791bf0B84"),
		Signers: []common.Address{
			common.HexToAddress("0x32162F3581E88a5f62e8A61892B42C46E2c18f7b"), // Peter
			common.HexToAddress("0x78d1aD571A1A09D60D9BBf25894b44e4C8859595"), // Martin
			common.HexToAddress("0x286834935f4A8Cfb4FF4C77D5770C2775aE2b0E7"), // Zsolt
			common.HexToAddress("0xb86e2B0Ab5A4B1373e40c51A7C712c70Ba2f9f8E"), // Gary
			common.HexToAddress("0x0DF8fa387C602AE62559cC4aFa4972A7045d6707"), // Guillaume
		},
		Threshold: 2,
	}

	// SepoliaChainConfig contains the chain parameters to run a node on the Sepolia test network.
	SepoliaChainConfig = &ChainConfig{
		ChainID:                       big.NewInt(11155111),
		HomesteadBlock:                big.NewInt(0),
		DAOForkBlock:                  nil,
		DAOForkSupport:                true,
		EIP150Block:                   big.NewInt(0),
		EIP155Block:                   big.NewInt(0),
		EIP158Block:                   big.NewInt(0),
		ByzantiumBlock:                big.NewInt(0),
		ConstantinopleBlock:           big.NewInt(0),
		PetersburgBlock:               big.NewInt(0),
		IstanbulBlock:                 big.NewInt(0),
		MuirGlacierBlock:              big.NewInt(0),
		BerlinBlock:                   big.NewInt(0),
		LondonBlock:                   big.NewInt(0),
		TerminalTotalDifficulty:       big.NewInt(17_000_000_000_000_000),
		TerminalTotalDifficultyPassed: true,
		MergeNetsplitBlock:            big.NewInt(1735371),
		Ethash:                        new(EthashConfig),
	}

	// SepoliaTrustedCheckpoint contains the light client trusted checkpoint for the Sepolia test network.
	SepoliaTrustedCheckpoint = &TrustedCheckpoint{
		SectionIndex: 34,
		SectionHead:  common.HexToHash("0xe361400fcbc468d641e7bdd0b0946a3548e97c5d2703b124f04a3f1deccec244"),
		CHTRoot:      common.HexToHash("0xea6768fd288dce7d84f590884908ec39e4de78e6e1a38de5c5419b0f49a42f91"),
		BloomRoot:    common.HexToHash("0x06d32f35d5a611bfd0333ad44e39c619449824167d8ef2913edc48a8112be2cd"),
	}

	// RinkebyChainConfig contains the chain parameters to run a node on the Rinkeby test network.
	RinkebyChainConfig = &ChainConfig{
		ChainID:             big.NewInt(4),
		HomesteadBlock:      big.NewInt(1),
		DAOForkBlock:        nil,
		DAOForkSupport:      true,
		EIP150Block:         big.NewInt(2),
		EIP150Hash:          common.HexToHash("0x9b095b36c15eaf13044373aef8ee0bd3a382a5abb92e402afa44b8249c3a90e9"),
		EIP155Block:         big.NewInt(3),
		EIP158Block:         big.NewInt(3),
		ByzantiumBlock:      big.NewInt(1_035_301),
		ConstantinopleBlock: big.NewInt(3_660_663),
		PetersburgBlock:     big.NewInt(4_321_234),
		IstanbulBlock:       big.NewInt(5_435_345),
		MuirGlacierBlock:    nil,
		BerlinBlock:         big.NewInt(8_290_928),
		LondonBlock:         big.NewInt(8_897_988),
		ArrowGlacierBlock:   nil,
		Clique: &CliqueConfig{
			Period: 15,
			Epoch:  30000,
		},
	}

	// RinkebyTrustedCheckpoint contains the light client trusted checkpoint for the Rinkeby test network.
	RinkebyTrustedCheckpoint = &TrustedCheckpoint{
		SectionIndex: 326,
		SectionHead:  common.HexToHash("0x941a41a153b0e36cb15d9d193d1d0f9715bdb2435efd1c95119b64168667ce00"),
		CHTRoot:      common.HexToHash("0xe2331e00d579cf4093091dee35bef772e63c2341380c276041dc22563c8aba2e"),
		BloomRoot:    common.HexToHash("0x595206febcf118958c2bc1218ea71d01fd04b8f97ad71813df4be0af5b36b0e5"),
	}

	// RinkebyCheckpointOracle contains a set of configs for the Rinkeby test network oracle.
	RinkebyCheckpointOracle = &CheckpointOracleConfig{
		Address: common.HexToAddress("0xebe8eFA441B9302A0d7eaECc277c09d20D684540"),
		Signers: []common.Address{
			common.HexToAddress("0xd9c9cd5f6779558b6e0ed4e6acf6b1947e7fa1f3"), // Peter
			common.HexToAddress("0x78d1aD571A1A09D60D9BBf25894b44e4C8859595"), // Martin
			common.HexToAddress("0x286834935f4A8Cfb4FF4C77D5770C2775aE2b0E7"), // Zsolt
			common.HexToAddress("0xb86e2B0Ab5A4B1373e40c51A7C712c70Ba2f9f8E"), // Gary
		},
		Threshold: 2,
	}

	// GoerliChainConfig contains the chain parameters to run a node on the Görli test network.
	GoerliChainConfig = &ChainConfig{
		ChainID:                       big.NewInt(5),
		HomesteadBlock:                big.NewInt(0),
		DAOForkBlock:                  nil,
		DAOForkSupport:                true,
		EIP150Block:                   big.NewInt(0),
		EIP155Block:                   big.NewInt(0),
		EIP158Block:                   big.NewInt(0),
		ByzantiumBlock:                big.NewInt(0),
		ConstantinopleBlock:           big.NewInt(0),
		PetersburgBlock:               big.NewInt(0),
		IstanbulBlock:                 big.NewInt(1_561_651),
		MuirGlacierBlock:              nil,
		BerlinBlock:                   big.NewInt(4_460_644),
		LondonBlock:                   big.NewInt(5_062_605),
		ArrowGlacierBlock:             nil,
		TerminalTotalDifficulty:       big.NewInt(10_790_000),
		TerminalTotalDifficultyPassed: true,
		Clique: &CliqueConfig{
			Period: 15,
			Epoch:  30000,
		},
	}

	// GoerliTrustedCheckpoint contains the light client trusted checkpoint for the Görli test network.
	GoerliTrustedCheckpoint = &TrustedCheckpoint{
		SectionIndex: 210,
		SectionHead:  common.HexToHash("0xbb11eaf551a6c06f74a6c7bbfe1699cbf64b8f248b64691da916dd443176db2f"),
		CHTRoot:      common.HexToHash("0x9934ae326d00d9c7de2e074c0e51689efb7fa7fcba18929ff4279c27259c45e6"),
		BloomRoot:    common.HexToHash("0x7fe3bd4fd45194aa8a5cfe5ac590edff1f870d3d98d3c310494e7f67613a87ff"),
	}

	// GoerliCheckpointOracle contains a set of configs for the Goerli test network oracle.
	GoerliCheckpointOracle = &CheckpointOracleConfig{
		Address: common.HexToAddress("0x18CA0E045F0D772a851BC7e48357Bcaab0a0795D"),
		Signers: []common.Address{
			common.HexToAddress("0x4769bcaD07e3b938B7f43EB7D278Bc7Cb9efFb38"), // Peter
			common.HexToAddress("0x78d1aD571A1A09D60D9BBf25894b44e4C8859595"), // Martin
			common.HexToAddress("0x286834935f4A8Cfb4FF4C77D5770C2775aE2b0E7"), // Zsolt
			common.HexToAddress("0xb86e2B0Ab5A4B1373e40c51A7C712c70Ba2f9f8E"), // Gary
			common.HexToAddress("0x0DF8fa387C602AE62559cC4aFa4972A7045d6707"), // Guillaume
		},
		Threshold: 2,
	}

	// AllEthashProtocolChanges contains every protocol change (EIPs) introduced
	// and accepted by the Ethereum core developers into the Ethash consensus.
	//
	// This configuration is intentionally not using keyed fields to force anyone
	// adding flags to the config to also have to set these fields.
	AllEthashProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, nil, nil, false, new(EthashConfig), nil}

	// AllCliqueProtocolChanges contains every protocol change (EIPs) introduced
	// and accepted by the Ethereum core developers into the Clique consensus.
	//
	// This configuration is intentionally not using keyed fields to force anyone
	// adding flags to the config to also have to set these fields.
	AllCliqueProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, nil, nil, nil, nil, false, nil, &CliqueConfig{Period: 0, Epoch: 30000}}

	TestChainConfig = &ChainConfig{big.NewInt(1), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, nil, nil, false, new(EthashConfig), nil}
	TestRules       = TestChainConfig.Rules(new(big.Int), false)
)

// NetworkNames are user friendly names to use in the chain spec banner.
var NetworkNames = map[string]string{
	MainnetChainConfig.ChainID.String(): "mainnet",
	RopstenChainConfig.ChainID.String(): "ropsten",
	RinkebyChainConfig.ChainID.String(): "rinkeby",
	GoerliChainConfig.ChainID.String():  "goerli",
	SepoliaChainConfig.ChainID.String(): "sepolia",
}

// TrustedCheckpoint represents a set of post-processed trie roots (CHT and
// BloomTrie) associated with the appropriate section index and head hash. It is
// used to start light syncing from this checkpoint and avoid downloading the
// entire header chain while still being able to securely access old headers/logs.
type TrustedCheckpoint struct {
	SectionIndex uint64      `json:"sectionIndex"`
	SectionHead  common.Hash `json:"sectionHead"`
	CHTRoot      common.Hash `json:"chtRoot"`
	BloomRoot    common.Hash `json:"bloomRoot"`
}

// HashEqual returns an indicator comparing the itself hash with given one.
func (c *TrustedCheckpoint) HashEqual(hash common.Hash) bool {
	if c.Empty() {
		return hash == common.Hash{}
	}
	return c.Hash() == hash
}

// Hash returns the hash of checkpoint's four key fields(index, sectionHead, chtRoot and bloomTrieRoot).
func (c *TrustedCheckpoint) Hash() common.Hash {
	var sectionIndex [8]byte
	binary.BigEndian.PutUint64(sectionIndex[:], c.SectionIndex)

	w := sha3.NewLegacyKeccak256()
	w.Write(sectionIndex[:])
	w.Write(c.SectionHead[:])
	w.Write(c.CHTRoot[:])
	w.Write(c.BloomRoot[:])

	var h common.Hash
	w.Sum(h[:0])
	return h
}

// Empty returns an indicator whether the checkpoint is regarded as empty.
func (c *TrustedCheckpoint) Empty() bool {
	return c.SectionHead == (common.Hash{}) || c.CHTRoot == (common.Hash{}) || c.BloomRoot == (common.Hash{})
}

// CheckpointOracleConfig represents a set of checkpoint contract(which acts as an oracle)
// config which used for light client checkpoint syncing.
type CheckpointOracleConfig struct {
	Address   common.Address   `json:"address"`
	Signers   []common.Address `json:"signers"`
	Threshold uint64           `json:"threshold"`
}

// ChainConfig is the core config which determines the blockchain settings.
//
// ChainConfig is stored in the database on a per block basis. This means
// that any network, identified by its genesis block, can have its own
// set of configuration options.
type ChainConfig struct {
	ChainID *big.Int `json:"chainId"` // chainId identifies the current chain and is used for replay protection

	HomesteadBlock *big.Int `json:"homesteadBlock,omitempty"` // Homestead switch block (nil = no fork, 0 = already homestead)

	DAOForkBlock   *big.Int `json:"daoForkBlock,omitempty"`   // TheDAO hard-fork switch block (nil = no fork)
	DAOForkSupport bool     `json:"daoForkSupport,omitempty"` // Whether the nodes supports or opposes the DAO hard-fork

	// EIP150 implements the Gas price changes (https://github.com/ethereum/EIPs/issues/150)
	EIP150Block *big.Int    `json:"eip150Block,omitempty"` // EIP150 HF block (nil = no fork)
	EIP150Hash  common.Hash `json:"eip150Hash,omitempty"`  // EIP150 HF hash (needed for header only clients as only gas pricing changed)

	EIP155Block *big.Int `json:"eip155Block,omitempty"` // EIP155 HF block
	EIP158Block *big.Int `json:"eip158Block,omitempty"` // EIP158 HF block

	ByzantiumBlock      *big.Int `json:"byzantiumBlock,omitempty"`      // Byzantium switch block (nil = no fork, 0 = already on byzantium)
	ConstantinopleBlock *big.Int `json:"constantinopleBlock,omitempty"` // Constantinople switch block (nil = no fork, 0 = already activated)
	PetersburgBlock     *big.Int `json:"petersburgBlock,omitempty"`     // Petersburg switch block (nil = same as Constantinople)
	IstanbulBlock       *big.Int `json:"istanbulBlock,omitempty"`       // Istanbul switch block (nil = no fork, 0 = already on istanbul)
	MuirGlacierBlock    *big.Int `json:"muirGlacierBlock,omitempty"`    // Eip-2384 (bomb delay) switch block (nil = no fork, 0 = already activated)
	BerlinBlock         *big.Int `json:"berlinBlock,omitempty"`         // Berlin switch block (nil = no fork, 0 = already on berlin)
	LondonBlock         *big.Int `json:"londonBlock,omitempty"`         // London switch block (nil = no fork, 0 = already on london)

	FCIP2Block *big.Int `json:"fcip2Block,omitempty"` // FCIP2 HF block

	ArrowGlacierBlock  *big.Int `json:"arrowGlacierBlock,omitempty"`  // Eip-4345 (bomb delay) switch block (nil = no fork, 0 = already activated)
	GrayGlacierBlock   *big.Int `json:"grayGlacierBlock,omitempty"`   // Eip-5133 (bomb delay) switch block (nil = no fork, 0 = already activated)
	MergeNetsplitBlock *big.Int `json:"mergeNetsplitBlock,omitempty"` // Virtual fork after The Merge to use as a network splitter
	ShanghaiBlock      *big.Int `json:"shanghaiBlock,omitempty"`      // Shanghai switch block (nil = no fork, 0 = already on shanghai)
	CancunBlock        *big.Int `json:"cancunBlock,omitempty"`        // Cancun switch block (nil = no fork, 0 = already on cancun)

	// TerminalTotalDifficulty is the amount of total difficulty reached by
	// the network that triggers the consensus upgrade.
	TerminalTotalDifficulty *big.Int `json:"terminalTotalDifficulty,omitempty"`

	// TerminalTotalDifficultyPassed is a flag specifying that the network already
	// passed the terminal total difficulty. Its purpose is to disable legacy sync
	// even without having seen the TTD locally (safer long term).
	TerminalTotalDifficultyPassed bool `json:"terminalTotalDifficultyPassed,omitempty"`

	// Various consensus engines
	Ethash *EthashConfig `json:"ethash,omitempty"`
	Clique *CliqueConfig `json:"clique,omitempty"`
}

// EthashConfig is the consensus engine configs for proof-of-work based sealing.
type EthashConfig struct{}

// String implements the stringer interface, returning the consensus engine details.
func (c *EthashConfig) String() string {
	return "ethash"
}

// CliqueConfig is the consensus engine configs for proof-of-authority based sealing.
type CliqueConfig struct {
	Period uint64 `json:"period"` // Number of seconds between blocks to enforce
	Epoch  uint64 `json:"epoch"`  // Epoch length to reset votes and checkpoint
}

// String implements the stringer interface, returning the consensus engine details.
func (c *CliqueConfig) String() string {
	return "clique"
}

// String implements the fmt.Stringer interface.
func (c *ChainConfig) String() string {
	var banner string

	// Create some basinc network config output
	network := NetworkNames[c.ChainID.String()]
	if network == "" {
		network = "unknown"
	}
	banner += fmt.Sprintf("Chain ID:  %v (%s)\n", c.ChainID, network)
	switch {
	case c.Ethash != nil:
		if c.TerminalTotalDifficulty == nil {
			banner += "Consensus: Ethash (proof-of-work)\n"
		} else if !c.TerminalTotalDifficultyPassed {
			banner += "Consensus: Beacon (proof-of-stake-and-activity), merging from Ethash (proof-of-work)\n"
		} else {
			banner += "Consensus: Beacon (proof-of-stake-and-activity), merged from Ethash (proof-of-work)\n"
		}
	case c.Clique != nil:
		if c.TerminalTotalDifficulty == nil {
			banner += "Consensus: Clique (proof-of-authority)\n"
		} else if !c.TerminalTotalDifficultyPassed {
			banner += "Consensus: Beacon (proof-of-stake-and-activity), merging from Clique (proof-of-authority)\n"
		} else {
			banner += "Consensus: Beacon (proof-of-stake-and-activity), merged from Clique (proof-of-authority)\n"
		}
	default:
		banner += "Consensus: unknown\n"
	}
	banner += "\n"

	// Create a list of forks with a short description of them. Forks that only
	// makes sense for mainnet should be optional at printing to avoid bloating
	// the output for testnets and private networks.
	banner += "Pre-Merge hard forks:\n"
	banner += fmt.Sprintf(" - Homestead:                   %-8v (https://github.com/ethereum/execution-specs/blob/master/network-upgrades/mainnet-upgrades/homestead.md)\n", c.HomesteadBlock)
	if c.DAOForkBlock != nil {
		banner += fmt.Sprintf(" - DAO Fork:                    %-8v (https://github.com/ethereum/execution-specs/blob/master/network-upgrades/mainnet-upgrades/dao-fork.md)\n", c.DAOForkBlock)
	}
	banner += fmt.Sprintf(" - Tangerine Whistle (EIP 150): %-8v (https://github.com/ethereum/execution-specs/blob/master/network-upgrades/mainnet-upgrades/tangerine-whistle.md)\n", c.EIP150Block)
	banner += fmt.Sprintf(" - Spurious Dragon/1 (EIP 155): %-8v (https://github.com/ethereum/execution-specs/blob/master/network-upgrades/mainnet-upgrades/spurious-dragon.md)\n", c.EIP155Block)
	banner += fmt.Sprintf(" - Spurious Dragon/2 (EIP 158): %-8v (https://github.com/ethereum/execution-specs/blob/master/network-upgrades/mainnet-upgrades/spurious-dragon.md)\n", c.EIP155Block)
	banner += fmt.Sprintf(" - Byzantium:                   %-8v (https://github.com/ethereum/execution-specs/blob/master/network-upgrades/mainnet-upgrades/byzantium.md)\n", c.ByzantiumBlock)
	banner += fmt.Sprintf(" - Constantinople:              %-8v (https://github.com/ethereum/execution-specs/blob/master/network-upgrades/mainnet-upgrades/constantinople.md)\n", c.ConstantinopleBlock)
	banner += fmt.Sprintf(" - Petersburg:                  %-8v (https://github.com/ethereum/execution-specs/blob/master/network-upgrades/mainnet-upgrades/petersburg.md)\n", c.PetersburgBlock)
	banner += fmt.Sprintf(" - Istanbul:                    %-8v (https://github.com/ethereum/execution-specs/blob/master/network-upgrades/mainnet-upgrades/istanbul.md)\n", c.IstanbulBlock)
	if c.MuirGlacierBlock != nil {
		banner += fmt.Sprintf(" - Muir Glacier:                %-8v (https://github.com/ethereum/execution-specs/blob/master/network-upgrades/mainnet-upgrades/muir-glacier.md)\n", c.MuirGlacierBlock)
	}
	banner += fmt.Sprintf(" - Berlin:                      %-8v (https://github.com/ethereum/execution-specs/blob/master/network-upgrades/mainnet-upgrades/berlin.md)\n", c.BerlinBlock)
	banner += fmt.Sprintf(" - London:                      %-8v (https://github.com/ethereum/execution-specs/blob/master/network-upgrades/mainnet-upgrades/london.md)\n", c.LondonBlock)
	banner += fmt.Sprintf(" - FCIP 2:                      %-8v\n", c.FCIP2Block)
	if c.ArrowGlacierBlock != nil {
		banner += fmt.Sprintf(" - Arrow Glacier:               %-8v (https://github.com/ethereum/execution-specs/blob/master/network-upgrades/mainnet-upgrades/arrow-glacier.md)\n", c.ArrowGlacierBlock)
	}
	if c.GrayGlacierBlock != nil {
		banner += fmt.Sprintf(" - Gray Glacier:                %-8v (https://github.com/ethereum/execution-specs/blob/master/network-upgrades/mainnet-upgrades/gray-glacier.md)\n", c.GrayGlacierBlock)
	}
	if c.ShanghaiBlock != nil {
		banner += fmt.Sprintf(" - Shanghai:                     %-8v (https://github.com/ethereum/execution-specs/blob/master/network-upgrades/mainnet-upgrades/shanghai.md)\n", c.ShanghaiBlock)
	}
	if c.CancunBlock != nil {
		banner += fmt.Sprintf(" - Cancun:                      %-8v\n", c.CancunBlock)
	}
	banner += "\n"

	// Add a special section for the merge as it's non-obvious
	if c.TerminalTotalDifficulty == nil {
		banner += "The Merge is not yet available for this network!\n"
		banner += " - Hard-fork specification: https://github.com/ethereum/execution-specs/blob/master/network-upgrades/mainnet-upgrades/paris.md"
	} else {
		banner += "Merge configured:\n"
		banner += " - Hard-fork specification:    https://github.com/ethereum/execution-specs/blob/master/network-upgrades/mainnet-upgrades/paris.md\n"
		banner += fmt.Sprintf(" - Network known to be merged: %v\n", c.TerminalTotalDifficultyPassed)
		banner += fmt.Sprintf(" - Total terminal difficulty:  %v\n", c.TerminalTotalDifficulty)
		banner += fmt.Sprintf(" - Merge netsplit block:       %-8v", c.MergeNetsplitBlock)
	}
	return banner
}

// IsHomestead returns whether num is either equal to the homestead block or greater.
func (c *ChainConfig) IsHomestead(num *big.Int) bool {
	return isForked(c.HomesteadBlock, num)
}

// IsDAOFork returns whether num is either equal to the DAO fork block or greater.
func (c *ChainConfig) IsDAOFork(num *big.Int) bool {
	return isForked(c.DAOForkBlock, num)
}

// IsEIP150 returns whether num is either equal to the EIP150 fork block or greater.
func (c *ChainConfig) IsEIP150(num *big.Int) bool {
	return isForked(c.EIP150Block, num)
}

// IsEIP155 returns whether num is either equal to the EIP155 fork block or greater.
func (c *ChainConfig) IsEIP155(num *big.Int) bool {
	return isForked(c.EIP155Block, num)
}

// IsEIP158 returns whether num is either equal to the EIP158 fork block or greater.
func (c *ChainConfig) IsEIP158(num *big.Int) bool {
	return isForked(c.EIP158Block, num)
}

func (c *ChainConfig) IsFCIP2(num *big.Int) bool {
	return isForked(c.FCIP2Block, num)
}

// IsByzantium returns whether num is either equal to the Byzantium fork block or greater.
func (c *ChainConfig) IsByzantium(num *big.Int) bool {
	return isForked(c.ByzantiumBlock, num)
}

// IsConstantinople returns whether num is either equal to the Constantinople fork block or greater.
func (c *ChainConfig) IsConstantinople(num *big.Int) bool {
	return isForked(c.ConstantinopleBlock, num)
}

// IsMuirGlacier returns whether num is either equal to the Muir Glacier (EIP-2384) fork block or greater.
func (c *ChainConfig) IsMuirGlacier(num *big.Int) bool {
	return isForked(c.MuirGlacierBlock, num)
}

// IsPetersburg returns whether num is either
// - equal to or greater than the PetersburgBlock fork block,
// - OR is nil, and Constantinople is active
func (c *ChainConfig) IsPetersburg(num *big.Int) bool {
	return isForked(c.PetersburgBlock, num) || c.PetersburgBlock == nil && isForked(c.ConstantinopleBlock, num)
}

// IsIstanbul returns whether num is either equal to the Istanbul fork block or greater.
func (c *ChainConfig) IsIstanbul(num *big.Int) bool {
	return isForked(c.IstanbulBlock, num)
}

// IsBerlin returns whether num is either equal to the Berlin fork block or greater.
func (c *ChainConfig) IsBerlin(num *big.Int) bool {
	return isForked(c.BerlinBlock, num)
}

// IsLondon returns whether num is either equal to the London fork block or greater.
func (c *ChainConfig) IsLondon(num *big.Int) bool {
	return isForked(c.LondonBlock, num)
}

// IsArrowGlacier returns whether num is either equal to the Arrow Glacier (EIP-4345) fork block or greater.
func (c *ChainConfig) IsArrowGlacier(num *big.Int) bool {
	return isForked(c.ArrowGlacierBlock, num)
}

// IsGrayGlacier returns whether num is either equal to the Gray Glacier (EIP-5133) fork block or greater.
func (c *ChainConfig) IsGrayGlacier(num *big.Int) bool {
	return isForked(c.GrayGlacierBlock, num)
}

// IsTerminalPoWBlock returns whether the given block is the last block of PoW stage.
func (c *ChainConfig) IsTerminalPoWBlock(parentTotalDiff *big.Int, totalDiff *big.Int) bool {
	if c.TerminalTotalDifficulty == nil {
		return false
	}
	return parentTotalDiff.Cmp(c.TerminalTotalDifficulty) < 0 && totalDiff.Cmp(c.TerminalTotalDifficulty) >= 0
}

// IsShanghai returns whether num is either equal to the Shanghai fork block or greater.
func (c *ChainConfig) IsShanghai(num *big.Int) bool {
	return isForked(c.ShanghaiBlock, num)
}

// IsCancun returns whether num is either equal to the Cancun fork block or greater.
func (c *ChainConfig) IsCancun(num *big.Int) bool {
	return isForked(c.CancunBlock, num)
}

// CheckCompatible checks whether scheduled fork transitions have been imported
// with a mismatching chain configuration.
func (c *ChainConfig) CheckCompatible(newcfg *ChainConfig, height uint64) *ConfigCompatError {
	bhead := new(big.Int).SetUint64(height)

	// Iterate checkCompatible to find the lowest conflict.
	var lasterr *ConfigCompatError
	for {
		err := c.checkCompatible(newcfg, bhead)
		if err == nil || (lasterr != nil && err.RewindTo == lasterr.RewindTo) {
			break
		}
		lasterr = err
		bhead.SetUint64(err.RewindTo)
	}
	return lasterr
}

// CheckConfigForkOrder checks that we don't "skip" any forks, geth isn't pluggable enough
// to guarantee that forks can be implemented in a different order than on official networks
func (c *ChainConfig) CheckConfigForkOrder() error {
	type fork struct {
		name     string
		block    *big.Int
		optional bool // if true, the fork may be nil and next fork is still allowed
	}
	var lastFork fork
	for _, cur := range []fork{
		{name: "homesteadBlock", block: c.HomesteadBlock},
		{name: "daoForkBlock", block: c.DAOForkBlock, optional: true},
		{name: "eip150Block", block: c.EIP150Block},
		{name: "eip155Block", block: c.EIP155Block},
		{name: "eip158Block", block: c.EIP158Block},
		{name: "byzantiumBlock", block: c.ByzantiumBlock},
		{name: "constantinopleBlock", block: c.ConstantinopleBlock},
		{name: "petersburgBlock", block: c.PetersburgBlock},
		{name: "istanbulBlock", block: c.IstanbulBlock},
		{name: "muirGlacierBlock", block: c.MuirGlacierBlock, optional: true},
		{name: "berlinBlock", block: c.BerlinBlock},
		{name: "londonBlock", block: c.LondonBlock},
		{name: "arrowGlacierBlock", block: c.ArrowGlacierBlock, optional: true},
		{name: "grayGlacierBlock", block: c.GrayGlacierBlock, optional: true},
		{name: "mergeNetsplitBlock", block: c.MergeNetsplitBlock, optional: true},
		{name: "shanghaiBlock", block: c.ShanghaiBlock, optional: true},
		{name: "cancunBlock", block: c.CancunBlock, optional: true},
	} {
		if lastFork.name != "" {
			// Next one must be higher number
			if lastFork.block == nil && cur.block != nil {
				return fmt.Errorf("unsupported fork ordering: %v not enabled, but %v enabled at %v",
					lastFork.name, cur.name, cur.block)
			}
			if lastFork.block != nil && cur.block != nil {
				if lastFork.block.Cmp(cur.block) > 0 {
					return fmt.Errorf("unsupported fork ordering: %v enabled at %v, but %v enabled at %v",
						lastFork.name, lastFork.block, cur.name, cur.block)
				}
			}
		}
		// If it was optional and not set, then ignore it
		if !cur.optional || cur.block != nil {
			lastFork = cur
		}
	}
	return nil
}

func (c *ChainConfig) checkCompatible(newcfg *ChainConfig, head *big.Int) *ConfigCompatError {
	if isForkIncompatible(c.HomesteadBlock, newcfg.HomesteadBlock, head) {
		return newCompatError("Homestead fork block", c.HomesteadBlock, newcfg.HomesteadBlock)
	}
	if isForkIncompatible(c.DAOForkBlock, newcfg.DAOForkBlock, head) {
		return newCompatError("DAO fork block", c.DAOForkBlock, newcfg.DAOForkBlock)
	}
	if c.IsDAOFork(head) && c.DAOForkSupport != newcfg.DAOForkSupport {
		return newCompatError("DAO fork support flag", c.DAOForkBlock, newcfg.DAOForkBlock)
	}
	if isForkIncompatible(c.EIP150Block, newcfg.EIP150Block, head) {
		return newCompatError("EIP150 fork block", c.EIP150Block, newcfg.EIP150Block)
	}
	if isForkIncompatible(c.EIP155Block, newcfg.EIP155Block, head) {
		return newCompatError("EIP155 fork block", c.EIP155Block, newcfg.EIP155Block)
	}
	if isForkIncompatible(c.EIP158Block, newcfg.EIP158Block, head) {
		return newCompatError("EIP158 fork block", c.EIP158Block, newcfg.EIP158Block)
	}
	if c.IsEIP158(head) && !configNumEqual(c.ChainID, newcfg.ChainID) {
		return newCompatError("EIP158 chain ID", c.EIP158Block, newcfg.EIP158Block)
	}
	if isForkIncompatible(c.ByzantiumBlock, newcfg.ByzantiumBlock, head) {
		return newCompatError("Byzantium fork block", c.ByzantiumBlock, newcfg.ByzantiumBlock)
	}
	if isForkIncompatible(c.ConstantinopleBlock, newcfg.ConstantinopleBlock, head) {
		return newCompatError("Constantinople fork block", c.ConstantinopleBlock, newcfg.ConstantinopleBlock)
	}
	if isForkIncompatible(c.PetersburgBlock, newcfg.PetersburgBlock, head) {
		// the only case where we allow Petersburg to be set in the past is if it is equal to Constantinople
		// mainly to satisfy fork ordering requirements which state that Petersburg fork be set if Constantinople fork is set
		if isForkIncompatible(c.ConstantinopleBlock, newcfg.PetersburgBlock, head) {
			return newCompatError("Petersburg fork block", c.PetersburgBlock, newcfg.PetersburgBlock)
		}
	}
	if isForkIncompatible(c.IstanbulBlock, newcfg.IstanbulBlock, head) {
		return newCompatError("Istanbul fork block", c.IstanbulBlock, newcfg.IstanbulBlock)
	}
	if isForkIncompatible(c.MuirGlacierBlock, newcfg.MuirGlacierBlock, head) {
		return newCompatError("Muir Glacier fork block", c.MuirGlacierBlock, newcfg.MuirGlacierBlock)
	}
	if isForkIncompatible(c.BerlinBlock, newcfg.BerlinBlock, head) {
		return newCompatError("Berlin fork block", c.BerlinBlock, newcfg.BerlinBlock)
	}
	if isForkIncompatible(c.LondonBlock, newcfg.LondonBlock, head) {
		return newCompatError("London fork block", c.LondonBlock, newcfg.LondonBlock)
	}
	if isForkIncompatible(c.ArrowGlacierBlock, newcfg.ArrowGlacierBlock, head) {
		return newCompatError("Arrow Glacier fork block", c.ArrowGlacierBlock, newcfg.ArrowGlacierBlock)
	}
	if isForkIncompatible(c.GrayGlacierBlock, newcfg.GrayGlacierBlock, head) {
		return newCompatError("Gray Glacier fork block", c.GrayGlacierBlock, newcfg.GrayGlacierBlock)
	}
	if isForkIncompatible(c.MergeNetsplitBlock, newcfg.MergeNetsplitBlock, head) {
		return newCompatError("Merge netsplit fork block", c.MergeNetsplitBlock, newcfg.MergeNetsplitBlock)
	}
	if isForkIncompatible(c.ShanghaiBlock, newcfg.ShanghaiBlock, head) {
		return newCompatError("Shanghai fork block", c.ShanghaiBlock, newcfg.ShanghaiBlock)
	}
	if isForkIncompatible(c.CancunBlock, newcfg.CancunBlock, head) {
		return newCompatError("Cancun fork block", c.CancunBlock, newcfg.CancunBlock)
	}
	return nil
}

// isForkIncompatible returns true if a fork scheduled at s1 cannot be rescheduled to
// block s2 because head is already past the fork.
func isForkIncompatible(s1, s2, head *big.Int) bool {
	return (isForked(s1, head) || isForked(s2, head)) && !configNumEqual(s1, s2)
}

// isForked returns whether a fork scheduled at block s is active at the given head block.
func isForked(s, head *big.Int) bool {
	if s == nil || head == nil {
		return false
	}
	return s.Cmp(head) <= 0
}

func configNumEqual(x, y *big.Int) bool {
	if x == nil {
		return y == nil
	}
	if y == nil {
		return x == nil
	}
	return x.Cmp(y) == 0
}

// ConfigCompatError is raised if the locally-stored blockchain is initialised with a
// ChainConfig that would alter the past.
type ConfigCompatError struct {
	What string
	// block numbers of the stored and new configurations
	StoredConfig, NewConfig *big.Int
	// the block number to which the local chain must be rewound to correct the error
	RewindTo uint64
}

func newCompatError(what string, storedblock, newblock *big.Int) *ConfigCompatError {
	var rew *big.Int
	switch {
	case storedblock == nil:
		rew = newblock
	case newblock == nil || storedblock.Cmp(newblock) < 0:
		rew = storedblock
	default:
		rew = newblock
	}
	err := &ConfigCompatError{what, storedblock, newblock, 0}
	if rew != nil && rew.Sign() > 0 {
		err.RewindTo = rew.Uint64() - 1
	}
	return err
}

func (err *ConfigCompatError) Error() string {
	return fmt.Sprintf("mismatching %s in database (have %d, want %d, rewindto %d)", err.What, err.StoredConfig, err.NewConfig, err.RewindTo)
}

// Rules wraps ChainConfig and is merely syntactic sugar or can be used for functions
// that do not have or require information about the block.
//
// Rules is a one time interface meaning that it shouldn't be used in between transition
// phases.
type Rules struct {
	ChainID                                                 *big.Int
	IsHomestead, IsEIP150, IsEIP155, IsEIP158               bool
	IsByzantium, IsConstantinople, IsPetersburg, IsIstanbul bool
	IsBerlin, IsLondon                                      bool
	IsMerge, IsShanghai, isCancun                           bool
	IsFCIP2                                                 bool
}

// Rules ensures c's ChainID is not nil.
func (c *ChainConfig) Rules(num *big.Int, isMerge bool) Rules {
	chainID := c.ChainID
	if chainID == nil {
		chainID = new(big.Int)
	}
	return Rules{
		ChainID:          new(big.Int).Set(chainID),
		IsHomestead:      c.IsHomestead(num),
		IsEIP150:         c.IsEIP150(num),
		IsEIP155:         c.IsEIP155(num),
		IsEIP158:         c.IsEIP158(num),
		IsByzantium:      c.IsByzantium(num),
		IsConstantinople: c.IsConstantinople(num),
		IsPetersburg:     c.IsPetersburg(num),
		IsIstanbul:       c.IsIstanbul(num),
		IsBerlin:         c.IsBerlin(num),
		IsLondon:         c.IsLondon(num),
		IsMerge:          isMerge,
		IsShanghai:       c.IsShanghai(num),
		isCancun:         c.IsCancun(num),
		IsFCIP2:          c.IsFCIP2(num),
	}
}
