const (

	//HashedAccounts
	// key - address hash
	// value - account encoded for storage
	// Contains Storage:
	//key - address hash + incarnation + storage key hash
	//value - storage value(common.hash)
	HashedAccounts = "HashedAccount"
	HashedStorage  = "HashedStorage"
)

const (

	//key - contract code hash
	//value - contract code
	Code = "Code"

	//key - addressHash+incarnation
	//value - code hash
	ContractCode = "HashedCodeHash"

	// IncarnationMap for deleted accounts
	//key - address
	//value - incarnation of account when it was last deleted
	IncarnationMap = "IncarnationMap"

	//TEVMCode -
	//key - contract code hash
	//value - contract TEVM code
	ContractTEVMCode = "TEVMCode"
)

const (
	// DatabaseInfo is used to store information about data layout.
	DatabaseInfo = "DbInfo"

	// Naming:
	//   NeaderNumber - Ethereum-specific block number. All nodes have same BlockNum.
	//   NeaderID - auto-increment ID. Depends on order in which node see headers.
	//      Invariant: for all headers in snapshots Number == ID. It means no reason to store Num/ID for this headers in DB.
	//   Same about: TxNum/TxID, BlockNum/BlockID
	HeaderNumber    = "HeaderNumber"           // header_hash -> header_num_u64
	BadHeaderNumber = "BadHeaderNumber"        // header_hash -> header_num_u64
	HeaderCanonical = "CanonicalHeader"        // block_num_u64 -> header hash
	Headers         = "Header"                 // block_num_u64 + hash -> header (RLP)
	HeaderTD        = "HeadersTotalDifficulty" // block_num_u64 + hash -> td (RLP)

	BlockBody = "BlockBody" // block_num_u64 + hash -> block body

	// Naming:
	//  TxNum - Ethereum canonical transaction number - same across all nodes.
	//  TxnID - auto-increment ID - can be differrent across all nodes
	//  BlockNum/BlockID - same
	//
	// EthTx - stores all transactions of Canonical/NonCanonical/Bad blocks
	// TxnID (auto-increment ID) - means nodes in network will have different ID of same transactions
	// Snapshots (frozen data): using TxNum (not TxnID)
	//
	// During ReOrg - txs are not removed/updated
	//
	// Also this table has system-txs before and after block: if
	// block has no system-tx - records are absent, but TxnID increasing
	//
	// In Erigon3: table MaxTxNum storing TxNum (not TxnID). History/Indices are using TxNum (not TxnID).
	EthTx           = "BlockTransaction"        // tx_id_u64 -> rlp(tx)
	NonCanonicalTxs = "NonCanonicalTransaction" // tbl_sequence_u64 -> rlp(tx)
	MaxTxNum        = "MaxTxNum"                // block_number_u64 -> max_tx_num_in_block_u64

	Receipts = "Receipt"        // block_num_u64 -> canonical block receipts (non-canonical are not stored)
	Log      = "TransactionLog" // block_num_u64 + txId -> logs of transaction

	// Stores bitmap indices - in which block numbers saw logs of given 'address' or 'topic'
	// [addr or topic] + [2 bytes inverted shard number] -> bitmap(blockN)
	// indices are sharded - because some bitmaps are >1Mb and when new incoming blocks process it
	//	 updates ~300 of bitmaps - by append small amount new values. It cause much big writes (MDBX does copy-on-write).
	//
	// if last existing shard size merge it with delta
	// if serialized size of delta > ShardLimit - break down to multiple shards
	// shard number - it's biggest value in bitmap
	LogTopicIndex   = "LogTopicIndex"
	LogAddressIndex = "LogAddressIndex"

	// CallTraceSet is the name of the table that contain the mapping of block number to the set (sorted) of all accounts
	// touched by call traces. It is DupSort-ed table
	// 8-byte BE block number -> account address -> two bits (one for "from", another for "to")
	CallTraceSet = "CallTraceSet"
	// Indices for call traces - have the same format as LogTopicIndex and LogAddressIndex
	// Store bitmap indices - in which block number we saw calls from (CallFromIndex) or to (CallToIndex) some addresses
	CallFromIndex = "CallFromIndex"
	CallToIndex   = "CallToIndex"

	// Cumulative indexes for estimation of stage execution
	CumulativeGasIndex         = "CumulativeGasIndex"
	CumulativeTransactionIndex = "CumulativeTransactionIndex"

	TxLookup = "BlockTransactionLookup" // hash -> transaction/receipt lookup metadata

	ConfigTable = "Config" // config prefix for the db

	// Progress of sync stages: stageName -> stageData
	SyncStageProgress = "SyncStage"

	Clique             = "Clique"
	CliqueSeparate     = "CliqueSeparate"
	CliqueSnapshot     = "CliqueSnapshot"
	CliqueLastSnapshot = "CliqueLastSnapshot"

	// Proof-of-stake
	// Beacon chain head that is been executed at the current time
	CurrentExecutionPayload = "CurrentExecutionPayload"

	// NodeRecords stores P2P node records (ENR)
	NodeRecords = "NodeRecord"
	// Inodes stores P2P discovery service info about the nodes
	Inodes = "Inode"

	// Transaction senders - stored separately from the block bodies
	Senders = "TxSender" // block_num_u64 + blockHash -> sendersList (no serialization format, every 20 bytes is new sender)

	// headBlockKey tracks the latest know full block's hash.
	HeadBlockKey = "LastBlock"

	HeadHeaderKey = "LastHeader"

	// headBlockHash, safeBlockHash, finalizedBlockHash of the latest Engine API forkchoice
	LastForkchoice = "LastForkchoice"

	// TransitionBlockKey tracks the last proof-of-work block
	TransitionBlockKey = "TransitionBlock"

	// migrationName -> serialized SyncStageProgress and SyncStageUnwind buckets
	// it stores stages progress to understand in which context was executed migration
	// in case of bug-report developer can ask content of this bucket
	Migrations = "Migration"

	Sequence = "Sequence" // tbl_name -> seq_u64

	Epoch        = "DevEpoch"        // block_num_u64+block_hash->transition_proof
	PendingEpoch = "DevPendingEpoch" // block_num_u64+block_hash->transition_proof

	Issuance = "Issuance" // block_num_u64->RLP(issuance+burnt[0 if < london])

	StateAccounts   = "StateAccounts"
	StateStorage    = "StateStorage"
	StateCode       = "StateCode"
	StateCommitment = "StateCommitment"

	BorReceipts  = "BorReceipt"
	BorFinality  = "BorFinality"
	BorTxLookup  = "BlockBorTransactionLookup" // transaction_hash -> block_num_u64
	BorSeparate  = "BorSeparate"               // persisted snapshots of the Validator Sets, with their proposer priorities
	BorEvents    = "BorEvents"                 // event_id -> event_payload
	BorEventNums = "BorEventNums"              // block_num -> event_id (first event_id in that block)
	BorSpans     = "BorSpans"                  // span_id -> span (in JSON encoding)

	// Downloader
	BittorrentCompletion = "BittorrentCompletion"
	BittorrentInfo       = "BittorrentInfo"

	// Domains/Histry/InvertedIndices
	// Contants have "Tbl" prefix, to avoid collision with actual Domain names
	// This constants is very rarely used in APP, but Domain/History/Idx names are widely used
	TblAccountKeys        = "AccountKeys"
	TblAccountVals        = "AccountVals"
	TblAccountHistoryKeys = "AccountHistoryKeys"
	TblAccountHistoryVals = "AccountHistoryVals"
	TblAccountIdx         = "AccountIdx"

	TblStorageKeys        = "StorageKeys"
	TblStorageVals        = "StorageVals"
	TblStorageHistoryKeys = "StorageHistoryKeys"
	TblStorageHistoryVals = "StorageHistoryVals"
	TblStorageIdx         = "StorageIdx"

	TblCodeKeys        = "CodeKeys"
	TblCodeVals        = "CodeVals"
	TblCodeHistoryKeys = "CodeHistoryKeys"
	TblCodeHistoryVals = "CodeHistoryVals"
	TblCodeIdx         = "CodeIdx"

	TblCommitmentKeys        = "CommitmentKeys"
	TblCommitmentVals        = "CommitmentVals"
	TblCommitmentHistoryKeys = "CommitmentHistoryKeys"
	TblCommitmentHistoryVals = "CommitmentHistoryVals"
	TblCommitmentIdx         = "CommitmentIdx"

	TblLogAddressKeys = "LogAddressKeys"
	TblLogAddressIdx  = "LogAddressIdx"
	TblLogTopicsKeys  = "LogTopicsKeys"
	TblLogTopicsIdx   = "LogTopicsIdx"

	TblTracesFromKeys = "TracesFromKeys"
	TblTracesFromIdx  = "TracesFromIdx"
	TblTracesToKeys   = "TracesToKeys"
	TblTracesToIdx    = "TracesToIdx"

	Snapshots = "Snapshots" // name -> hash

	//State Reconstitution
	RAccountKeys = "RAccountKeys"
	RAccountIdx  = "RAccountIdx"
	RStorageKeys = "RStorageKeys"
	RStorageIdx  = "RStorageIdx"
	RCodeKeys    = "RCodeKeys"
	RCodeIdx     = "RCodeIdx"

	PlainStateR    = "PlainStateR"    // temporary table for PlainState reconstitution
	PlainStateD    = "PlainStateD"    // temporary table for PlainStare reconstitution, deletes
	CodeR          = "CodeR"          // temporary table for Code reconstitution
	CodeD          = "CodeD"          // temporary table for Code reconstitution, deletes
	PlainContractR = "PlainContractR" // temporary table for PlainContract reconstitution
	PlainContractD = "PlainContractD" // temporary table for PlainContract reconstitution, deletes

	// [slot] => [Beacon state]
	BeaconState = "BeaconState"
	// [slot] => [signature + block without execution payload]
	BeaconBlocks = "BeaconBlock"
	// [slot] => [attestation list (custom encoding)]
	Attestetations = "Attestetations"
	// [slot] => [Finalized block root]
	FinalizedBlockRoots = "FinalizedBlockRoots"
	// [Root (block root/state root/eth1 root)] => Slot
	RootSlotIndex = "RootSlotIndex"

	// LightClientStore => LightClientStore object
	// LightClientFinalityUpdate => latest finality update
	// LightClientOptimisticUpdate => latest optimistic update
	LightClient = "LightClient"
	// Period (one every 27 hours) => LightClientUpdate
	LightClientUpdates = "LightClientUpdates"
)

const (
	RecentLocalTransaction = "RecentLocalTransaction" // sequence_u64 -> tx_hash
	PoolTransaction        = "PoolTransaction"        // txHash -> sender_id_u64+tx_rlp
	PoolInfo               = "PoolInfo"               // option_key -> option_value
)

const AccountChangeSet = "AccountChangeSet"

const E2AccountsHistory = "AccountHistory"

const E2StorageHistory = "StorageHistory"

const PlainContractCode = "PlainCodeHash"

const PlainState = "PlainState"

const ReadersLimit = 32000 // MDBX_READERS_LIMIT=32767

const StorageChangeSet = "StorageChangeSet"

const TrieOfAccounts = "TrieAccount"

const TrieOfStorage = "TrieStorage"

const Unlim int = -1

const VerkleRoots = "VerkleRoots"

const VerkleTrie = "VerkleTrie"