package node

import (
	"context"
	"errors"
	"os"
	"time"

	metricsi "github.com/ipfs/go-metrics-interface"

	"github.com/filecoin-project/go-state-types/abi"
	"github.com/filecoin-project/lotus/chain"
	"github.com/filecoin-project/lotus/chain/exchange"
	"github.com/filecoin-project/lotus/chain/store"
	"github.com/filecoin-project/lotus/chain/vm"
	"github.com/filecoin-project/lotus/chain/wallet"
	"github.com/filecoin-project/lotus/node/hello"
	"github.com/filecoin-project/lotus/system"

	logging "github.com/ipfs/go-log"
	ci "github.com/libp2p/go-libp2p-core/crypto"
	"github.com/libp2p/go-libp2p-core/host"
	"github.com/libp2p/go-libp2p-core/peer"
	"github.com/libp2p/go-libp2p-core/peerstore"
	"github.com/libp2p/go-libp2p-core/routing"
	dht "github.com/libp2p/go-libp2p-kad-dht"
	"github.com/libp2p/go-libp2p-peerstore/pstoremem"
	pubsub "github.com/libp2p/go-libp2p-pubsub"
	record "github.com/libp2p/go-libp2p-record"
	"github.com/libp2p/go-libp2p/p2p/net/conngater"
	"github.com/multiformats/go-multiaddr"
	"go.uber.org/fx"
	"golang.org/x/xerrors"

	"github.com/filecoin-project/go-fil-markets/discovery"
	discoveryimpl "github.com/filecoin-project/go-fil-markets/discovery/impl"
	"github.com/filecoin-project/go-fil-markets/retrievalmarket"
	"github.com/filecoin-project/go-fil-markets/storagemarket"
	"github.com/filecoin-project/go-fil-markets/storagemarket/impl/storedask"

	storage2 "github.com/filecoin-project/specs-storage/storage"

	"github.com/filecoin-project/lotus/api"
	"github.com/filecoin-project/lotus/chain/beacon"
	"github.com/filecoin-project/lotus/chain/gen"
	"github.com/filecoin-project/lotus/chain/gen/slashfilter"
	"github.com/filecoin-project/lotus/chain/market"
	"github.com/filecoin-project/lotus/chain/messagepool"
	"github.com/filecoin-project/lotus/chain/messagesigner"
	"github.com/filecoin-project/lotus/chain/metrics"
	"github.com/filecoin-project/lotus/chain/stmgr"
	"github.com/filecoin-project/lotus/chain/types"
	ledgerwallet "github.com/filecoin-project/lotus/chain/wallet/ledger"
	"github.com/filecoin-project/lotus/chain/wallet/remotewallet"
	sectorstorage "github.com/filecoin-project/lotus/extern/sector-storage"
	"github.com/filecoin-project/lotus/extern/sector-storage/ffiwrapper"
	"github.com/filecoin-project/lotus/extern/sector-storage/stores"
	"github.com/filecoin-project/lotus/extern/sector-storage/storiface"
	sealing "github.com/filecoin-project/lotus/extern/storage-sealing"
	"github.com/filecoin-project/lotus/journal"
	"github.com/filecoin-project/lotus/lib/peermgr"
	_ "github.com/filecoin-project/lotus/lib/sigs/bls"
	_ "github.com/filecoin-project/lotus/lib/sigs/secp"
	"github.com/filecoin-project/lotus/markets/dealfilter"
	"github.com/filecoin-project/lotus/markets/storageadapter"
	"github.com/filecoin-project/lotus/miner"
	"github.com/filecoin-project/lotus/node/config"
	"github.com/filecoin-project/lotus/node/impl"
	"github.com/filecoin-project/lotus/node/impl/common"
	"github.com/filecoin-project/lotus/node/impl/full"
	"github.com/filecoin-project/lotus/node/modules"
	"github.com/filecoin-project/lotus/node/modules/dtypes"
	"github.com/filecoin-project/lotus/node/modules/helpers"
	"github.com/filecoin-project/lotus/node/modules/lp2p"
	"github.com/filecoin-project/lotus/node/modules/testing"
	"github.com/filecoin-project/lotus/node/repo"
	"github.com/filecoin-project/lotus/paychmgr"
	"github.com/filecoin-project/lotus/paychmgr/settler"
	"github.com/filecoin-project/lotus/storage"
	"github.com/filecoin-project/lotus/storage/sectorblocks"
)

//nolint:deadcode,varcheck
var log = logging.Logger("builder")

// special is a type used to give keys to modules which
//  can't really be identified by the returned type
type special struct{ id int }

//nolint:golint
var (
	DefaultTransportsKey = special{0}  // Libp2p option
	DiscoveryHandlerKey  = special{2}  // Private type
	AddrsFactoryKey      = special{3}  // Libp2p option
	SmuxTransportKey     = special{4}  // Libp2p option
	RelayKey             = special{5}  // Libp2p option
	SecurityKey          = special{6}  // Libp2p option
	BaseRoutingKey       = special{7}  // fx groups + multiret
	NatPortMapKey        = special{8}  // Libp2p option
	ConnectionManagerKey = special{9}  // Libp2p option
	AutoNATSvcKey        = special{10} // Libp2p option
	BandwidthReporterKey = special{11} // Libp2p option
	ConnGaterKey         = special{12} // libp2p option
)

type invoke int

// Invokes are called in the order they are defined.
//nolint:golint
const (
	// InitJournal at position 0 initializes the journal global var as soon as
	// the system starts, so that it's available for all other components.
	InitJournalKey = invoke(iota)

	// System processes.
	InitMemoryWatchdog

	// libp2p
	PstoreAddSelfKeysKey
	StartListeningKey
	BootstrapKey

	// filecoin
	SetGenesisKey

	RunHelloKey
	RunChainExchangeKey
	RunChainGraphsync
	RunPeerMgrKey

	HandleIncomingBlocksKey
	HandleIncomingMessagesKey
	HandleMigrateClientFundsKey
	HandlePaymentChannelManagerKey

	// miner
	GetParamsKey
	HandleMigrateProviderFundsKey
	HandleDealsKey
	HandleRetrievalKey
	RunSectorServiceKey

	// daemon
	ExtractApiKey
	HeadMetricsKey
	SettlePaymentChannelsKey
	RunPeerTaggerKey
	SetupFallbackBlockstoresKey

	SetApiEndpointKey

	_nInvokes // keep this last
)

type Settings struct {
	// modules is a map of constructors for DI
	//
	// In most cases the index will be a reflect. Type of element returned by
	// the constructor, but for some 'constructors' it's hard to specify what's
	// the return type should be (or the constructor returns fx group)
	modules map[interface{}]fx.Option

	// invokes are separate from modules as they can't be referenced by return
	// type, and must be applied in correct order
	invokes []fx.Option

	nodeType repo.RepoType

	Online bool // Online option applied
	Config bool // Config option applied
	Lite   bool // Start node in "lite" mode
}

// Basic lotus-app services
func defaults() []Option {
	return []Option{
		// global system journal.
		Override(new(journal.DisabledEvents), journal.EnvDisabledEvents),
		Override(new(journal.Journal), modules.OpenFilesystemJournal),

		Override(new(system.MemoryConstraints), modules.MemoryConstraints),
		Override(InitMemoryWatchdog, modules.MemoryWatchdog),

		Override(new(helpers.MetricsCtx), func() context.Context {
			return metricsi.CtxScope(context.Background(), "lotus")
		}),

		Override(new(dtypes.ShutdownChan), make(chan struct{})),
	}
}

var LibP2P = Options(
	// Host config
	Override(new(dtypes.Bootstrapper), dtypes.Bootstrapper(false)),

	// Host dependencies
	Override(new(peerstore.Peerstore), pstoremem.NewPeerstore),
	Override(PstoreAddSelfKeysKey, lp2p.PstoreAddSelfKeys),
	Override(StartListeningKey, lp2p.StartListening(config.DefaultFullNode().Libp2p.ListenAddresses)),

	// Host settings
	Override(DefaultTransportsKey, lp2p.DefaultTransports),
	Override(AddrsFactoryKey, lp2p.AddrsFactory(nil, nil)),
	Override(SmuxTransportKey, lp2p.SmuxTransport(true)),
	Override(RelayKey, lp2p.NoRelay()),
	Override(SecurityKey, lp2p.Security(true, false)),

	// Host
	Override(new(lp2p.RawHost), lp2p.Host),
	Override(new(host.Host), lp2p.RoutedHost),
	Override(new(lp2p.BaseIpfsRouting), lp2p.DHTRouting(dht.ModeAuto)),

	Override(DiscoveryHandlerKey, lp2p.DiscoveryHandler),

	// Routing
	Override(new(record.Validator), modules.RecordValidator),
	Override(BaseRoutingKey, lp2p.BaseRouting),
	Override(new(routing.Routing), lp2p.Routing),

	// Services
	Override(NatPortMapKey, lp2p.NatPortMap),
	Override(BandwidthReporterKey, lp2p.BandwidthCounter),
	Override(AutoNATSvcKey, lp2p.AutoNATService),

	// Services (pubsub)
	Override(new(*dtypes.ScoreKeeper), lp2p.ScoreKeeper),
	Override(new(*pubsub.PubSub), lp2p.GossipSub),
	Override(new(*config.Pubsub), func(bs dtypes.Bootstrapper) *config.Pubsub {
		return &config.Pubsub{
			Bootstrapper: bool(bs),
		}
	}),

	// Services (connection management)
	Override(ConnectionManagerKey, lp2p.ConnectionManager(50, 200, 20*time.Second, nil)),
	Override(new(*conngater.BasicConnectionGater), lp2p.ConnGater),
	Override(ConnGaterKey, lp2p.ConnGaterOption),
)

func isType(t repo.RepoType) func(s *Settings) bool {
	return func(s *Settings) bool { return s.nodeType == t }
}

func isFullOrLiteNode(s *Settings) bool { return s.nodeType == repo.FullNode }
func isFullNode(s *Settings) bool       { return s.nodeType == repo.FullNode && !s.Lite }
func isLiteNode(s *Settings) bool       { return s.nodeType == repo.FullNode && s.Lite }

// Chain node provides access to the Filecoin blockchain, by setting up a full
// validator node, or by delegating some actions to other nodes (lite mode)
var ChainNode = Options(
	// Full node or lite node
	// TODO: Fix offline mode

	// Consensus settings
	Override(new(dtypes.DrandSchedule), modules.BuiltinDrandConfig),
	Override(new(stmgr.UpgradeSchedule), stmgr.DefaultUpgradeSchedule()),
	Override(new(dtypes.NetworkName), modules.NetworkName),
	Override(new(modules.Genesis), modules.ErrorGenesis),
	Override(new(dtypes.AfterGenesisSet), modules.SetGenesis),
	Override(SetGenesisKey, modules.DoSetGenesis),
	Override(new(beacon.Schedule), modules.RandomSchedule),

	// Network bootstrap
	Override(new(dtypes.BootstrapPeers), modules.BuiltinBootstrap),
	Override(new(dtypes.DrandBootstrap), modules.DrandBootstrap),

	// Consensus: crypto dependencies
	Override(new(ffiwrapper.Verifier), ffiwrapper.ProofVerifier),

	// Consensus: VM
	Override(new(vm.SyscallBuilder), vm.Syscalls),

	// Consensus: Chain storage/access
	Override(new(*store.ChainStore), modules.ChainStore),
	Override(new(*stmgr.StateManager), modules.StateManager),
	Override(new(dtypes.ChainBitswap), modules.ChainBitswap),
	Override(new(dtypes.ChainBlockService), modules.ChainBlockService), // todo: unused

	// Consensus: Chain sync

	// We don't want the SyncManagerCtor to be used as an fx constructor, but rather as a value.
	// It will be called implicitly by the Syncer constructor.
	Override(new(chain.SyncManagerCtor), func() chain.SyncManagerCtor { return chain.NewSyncManager }),
	Override(new(*chain.Syncer), modules.NewSyncer),
	Override(new(exchange.Client), exchange.NewClient),

	// Chain networking
	Override(new(*hello.Service), hello.NewHelloService),
	Override(new(exchange.Server), exchange.NewServer),
	Override(new(*peermgr.PeerMgr), peermgr.NewPeerMgr),

	// Chain mining API dependencies
	Override(new(*slashfilter.SlashFilter), modules.NewSlashFilter),

	// Service: Message Pool
	Override(new(dtypes.DefaultMaxFeeFunc), modules.NewDefaultMaxFeeFunc),
	Override(new(*messagepool.MessagePool), modules.MessagePool),
	Override(new(*dtypes.MpoolLocker), new(dtypes.MpoolLocker)),

	// Shared graphsync (markets, serving chain)
	Override(new(dtypes.Graphsync), modules.Graphsync(config.DefaultFullNode().Client.SimultaneousTransfers)),

	// Service: Wallet
	Override(new(*messagesigner.MessageSigner), messagesigner.NewMessageSigner),
	Override(new(*wallet.LocalWallet), wallet.NewWallet),
	Override(new(wallet.Default), From(new(*wallet.LocalWallet))),
	Override(new(api.WalletAPI), From(new(wallet.MultiWallet))),

	// Service: Payment channels
	Override(new(*paychmgr.Store), paychmgr.NewStore),
	Override(new(*paychmgr.Manager), paychmgr.NewManager),
	Override(HandlePaymentChannelManagerKey, paychmgr.HandleManager),
	Override(SettlePaymentChannelsKey, settler.SettlePaymentChannels),

	// Markets (common)
	Override(new(*discoveryimpl.Local), modules.NewLocalDiscovery),

	// Markets (retrieval)
	Override(new(discovery.PeerResolver), modules.RetrievalResolver),
	Override(new(retrievalmarket.RetrievalClient), modules.RetrievalClient),
	Override(new(dtypes.ClientDataTransfer), modules.NewClientGraphsyncDataTransfer),

	// Markets (storage)
	Override(new(*market.FundManager), market.NewFundManager),
	Override(new(dtypes.ClientDatastore), modules.NewClientDatastore),
	Override(new(storagemarket.StorageClient), modules.StorageClient),
	Override(new(storagemarket.StorageClientNode), storageadapter.NewClientNodeAdapter),
	Override(HandleMigrateClientFundsKey, modules.HandleMigrateClientFunds),

	// Lite node API
	ApplyIf(isLiteNode,
		Override(new(messagesigner.MpoolNonceAPI), From(new(modules.MpoolNonceAPI))),
		Override(new(full.ChainModuleAPI), From(new(api.GatewayAPI))),
		Override(new(full.GasModuleAPI), From(new(api.GatewayAPI))),
		Override(new(full.MpoolModuleAPI), From(new(api.GatewayAPI))),
		Override(new(full.StateModuleAPI), From(new(api.GatewayAPI))),
		Override(new(stmgr.StateManagerAPI), modules.NewRPCStateManager),
	),

	// Full node API / service startup
	ApplyIf(isFullNode,
		Override(new(messagesigner.MpoolNonceAPI), From(new(*messagepool.MessagePool))),
		Override(new(full.ChainModuleAPI), From(new(full.ChainModule))),
		Override(new(full.GasModuleAPI), From(new(full.GasModule))),
		Override(new(full.MpoolModuleAPI), From(new(full.MpoolModule))),
		Override(new(full.StateModuleAPI), From(new(full.StateModule))),
		Override(new(stmgr.StateManagerAPI), From(new(*stmgr.StateManager))),

		Override(RunHelloKey, modules.RunHello),
		Override(RunChainExchangeKey, modules.RunChainExchange),
		Override(RunPeerMgrKey, modules.RunPeerMgr),
		Override(HandleIncomingMessagesKey, modules.HandleIncomingMessages),
		Override(HandleIncomingBlocksKey, modules.HandleIncomingBlocks),
	),
)

var MinerNode = Options(
	// API dependencies
	Override(new(api.Common), From(new(common.CommonAPI))),
	Override(new(sectorstorage.StorageAuth), modules.StorageAuth),

	// Actor config
	Override(new(dtypes.MinerAddress), modules.MinerAddress),
	Override(new(dtypes.MinerID), modules.MinerID),
	Override(new(abi.RegisteredSealProof), modules.SealProofType),
	Override(new(dtypes.NetworkName), modules.StorageNetworkName),

	// Sector storage
	Override(new(*stores.Index), stores.NewIndex),
	Override(new(stores.SectorIndex), From(new(*stores.Index))),
	Override(new(stores.LocalStorage), From(new(repo.LockedRepo))),
	Override(new(*sectorstorage.Manager), modules.SectorStorage),
	Override(new(sectorstorage.SectorManager), From(new(*sectorstorage.Manager))),
	Override(new(storiface.WorkerReturn), From(new(sectorstorage.SectorManager))),

	// Sector storage: Proofs
	Override(new(ffiwrapper.Verifier), ffiwrapper.ProofVerifier),
	Override(new(storage2.Prover), From(new(sectorstorage.SectorManager))),

	// Sealing
	Override(new(sealing.SectorIDCounter), modules.SectorIDCounter),
	Override(GetParamsKey, modules.GetParams),

	// Mining / proving
	Override(new(*slashfilter.SlashFilter), modules.NewSlashFilter),
	Override(new(*storage.Miner), modules.StorageMiner(config.DefaultStorageMiner().Fees)),
	Override(new(*miner.Miner), modules.SetupBlockProducer),
	Override(new(gen.WinningPoStProver), storage.NewWinningPoStProver),

	Override(new(*storage.AddressSelector), modules.AddressSelector(nil)),

	// Markets
	Override(new(dtypes.StagingMultiDstore), modules.StagingMultiDatastore),
	Override(new(dtypes.StagingBlockstore), modules.StagingBlockstore),
	Override(new(dtypes.StagingDAG), modules.StagingDAG),
	Override(new(dtypes.StagingGraphsync), modules.StagingGraphsync),
	Override(new(dtypes.ProviderPieceStore), modules.NewProviderPieceStore),
	Override(new(*sectorblocks.SectorBlocks), sectorblocks.NewSectorBlocks),

	// Markets (retrieval)
	Override(new(retrievalmarket.RetrievalProvider), modules.RetrievalProvider),
	Override(new(dtypes.RetrievalDealFilter), modules.RetrievalDealFilter(nil)),
	Override(HandleRetrievalKey, modules.HandleRetrieval),

	// Markets (storage)
	Override(new(dtypes.ProviderDataTransfer), modules.NewProviderDAGServiceDataTransfer),
	Override(new(*storedask.StoredAsk), modules.NewStorageAsk),
	Override(new(dtypes.StorageDealFilter), modules.BasicDealFilter(nil)),
	Override(new(storagemarket.StorageProvider), modules.StorageProvider),
	Override(new(*storageadapter.DealPublisher), storageadapter.NewDealPublisher(nil, storageadapter.PublishMsgConfig{})),
	Override(new(storagemarket.StorageProviderNode), storageadapter.NewProviderNodeAdapter(nil)),
	Override(HandleMigrateProviderFundsKey, modules.HandleMigrateProviderFunds),
	Override(HandleDealsKey, modules.HandleDeals),

	// Config (todo: get a real property system)
	Override(new(dtypes.ConsiderOnlineStorageDealsConfigFunc), modules.NewConsiderOnlineStorageDealsConfigFunc),
	Override(new(dtypes.SetConsiderOnlineStorageDealsConfigFunc), modules.NewSetConsideringOnlineStorageDealsFunc),
	Override(new(dtypes.ConsiderOnlineRetrievalDealsConfigFunc), modules.NewConsiderOnlineRetrievalDealsConfigFunc),
	Override(new(dtypes.SetConsiderOnlineRetrievalDealsConfigFunc), modules.NewSetConsiderOnlineRetrievalDealsConfigFunc),
	Override(new(dtypes.StorageDealPieceCidBlocklistConfigFunc), modules.NewStorageDealPieceCidBlocklistConfigFunc),
	Override(new(dtypes.SetStorageDealPieceCidBlocklistConfigFunc), modules.NewSetStorageDealPieceCidBlocklistConfigFunc),
	Override(new(dtypes.ConsiderOfflineStorageDealsConfigFunc), modules.NewConsiderOfflineStorageDealsConfigFunc),
	Override(new(dtypes.SetConsiderOfflineStorageDealsConfigFunc), modules.NewSetConsideringOfflineStorageDealsFunc),
	Override(new(dtypes.ConsiderOfflineRetrievalDealsConfigFunc), modules.NewConsiderOfflineRetrievalDealsConfigFunc),
	Override(new(dtypes.SetConsiderOfflineRetrievalDealsConfigFunc), modules.NewSetConsiderOfflineRetrievalDealsConfigFunc),
	Override(new(dtypes.ConsiderVerifiedStorageDealsConfigFunc), modules.NewConsiderVerifiedStorageDealsConfigFunc),
	Override(new(dtypes.SetConsiderVerifiedStorageDealsConfigFunc), modules.NewSetConsideringVerifiedStorageDealsFunc),
	Override(new(dtypes.ConsiderUnverifiedStorageDealsConfigFunc), modules.NewConsiderUnverifiedStorageDealsConfigFunc),
	Override(new(dtypes.SetConsiderUnverifiedStorageDealsConfigFunc), modules.NewSetConsideringUnverifiedStorageDealsFunc),
	Override(new(dtypes.SetSealingConfigFunc), modules.NewSetSealConfigFunc),
	Override(new(dtypes.GetSealingConfigFunc), modules.NewGetSealConfigFunc),
	Override(new(dtypes.SetExpectedSealDurationFunc), modules.NewSetExpectedSealDurationFunc),
	Override(new(dtypes.GetExpectedSealDurationFunc), modules.NewGetExpectedSealDurationFunc),
)

// Online sets up basic libp2p node
func Online() Option {

	return Options(
		// make sure that online is applied before Config.
		// This is important because Config overrides some of Online units
		func(s *Settings) error { s.Online = true; return nil },
		ApplyIf(func(s *Settings) bool { return s.Config },
			Error(errors.New("the Online option must be set before Config option")),
		),

		LibP2P,

		ApplyIf(isFullOrLiteNode, ChainNode),
		ApplyIf(isType(repo.StorageMiner), MinerNode),
	)
}

func StorageMiner(out *api.StorageMiner) Option {
	return Options(
		ApplyIf(func(s *Settings) bool { return s.Config },
			Error(errors.New("the StorageMiner option must be set before Config option")),
		),
		ApplyIf(func(s *Settings) bool { return s.Online },
			Error(errors.New("the StorageMiner option must be set before Online option")),
		),

		func(s *Settings) error {
			s.nodeType = repo.StorageMiner
			return nil
		},

		func(s *Settings) error {
			resAPI := &impl.StorageMinerAPI{}
			s.invokes[ExtractApiKey] = fx.Populate(resAPI)
			*out = resAPI
			return nil
		},
	)
}

// Config sets up constructors based on the provided Config
func ConfigCommon(cfg *config.Common) Option {
	return Options(
		func(s *Settings) error { s.Config = true; return nil },
		Override(new(dtypes.APIEndpoint), func() (dtypes.APIEndpoint, error) {
			return multiaddr.NewMultiaddr(cfg.API.ListenAddress)
		}),
		Override(SetApiEndpointKey, func(lr repo.LockedRepo, e dtypes.APIEndpoint) error {
			return lr.SetAPIEndpoint(e)
		}),
		Override(new(sectorstorage.URLs), func(e dtypes.APIEndpoint) (sectorstorage.URLs, error) {
			ip := cfg.API.RemoteListenAddress

			var urls sectorstorage.URLs
			urls = append(urls, "http://"+ip+"/remote") // TODO: This makes no assumptions, and probably could...
			return urls, nil
		}),
		ApplyIf(func(s *Settings) bool { return s.Online },
			Override(StartListeningKey, lp2p.StartListening(cfg.Libp2p.ListenAddresses)),
			Override(ConnectionManagerKey, lp2p.ConnectionManager(
				cfg.Libp2p.ConnMgrLow,
				cfg.Libp2p.ConnMgrHigh,
				time.Duration(cfg.Libp2p.ConnMgrGrace),
				cfg.Libp2p.ProtectedPeers)),
			Override(new(*pubsub.PubSub), lp2p.GossipSub),
			Override(new(*config.Pubsub), &cfg.Pubsub),

			ApplyIf(func(s *Settings) bool { return len(cfg.Libp2p.BootstrapPeers) > 0 },
				Override(new(dtypes.BootstrapPeers), modules.ConfigBootstrap(cfg.Libp2p.BootstrapPeers)),
			),
		),
		Override(AddrsFactoryKey, lp2p.AddrsFactory(
			cfg.Libp2p.AnnounceAddresses,
			cfg.Libp2p.NoAnnounceAddresses)),
	)
}

func ConfigFullNode(c interface{}) Option {
	cfg, ok := c.(*config.FullNode)
	if !ok {
		return Error(xerrors.Errorf("invalid config from repo, got: %T", c))
	}

	ipfsMaddr := cfg.Client.IpfsMAddr
	return Options(
		ConfigCommon(&cfg.Common),

		If(cfg.Client.UseIpfs,
			Override(new(dtypes.ClientBlockstore), modules.IpfsClientBlockstore(ipfsMaddr, cfg.Client.IpfsOnlineMode)),
			If(cfg.Client.IpfsUseForRetrieval,
				Override(new(dtypes.ClientRetrievalStoreManager), modules.ClientBlockstoreRetrievalStoreManager),
			),
		),
		Override(new(dtypes.Graphsync), modules.Graphsync(cfg.Client.SimultaneousTransfers)),

		If(cfg.Metrics.HeadNotifs,
			Override(HeadMetricsKey, metrics.SendHeadNotifs(cfg.Metrics.Nickname)),
		),

		If(cfg.Wallet.RemoteBackend != "",
			Override(new(*remotewallet.RemoteWallet), remotewallet.SetupRemoteWallet(cfg.Wallet.RemoteBackend)),
		),
		If(cfg.Wallet.EnableLedger,
			Override(new(*ledgerwallet.LedgerWallet), ledgerwallet.NewWallet),
		),
		If(cfg.Wallet.DisableLocal,
			Unset(new(*wallet.LocalWallet)),
			Override(new(wallet.Default), wallet.NilDefault),
		),
	)
}

func ConfigStorageMiner(c interface{}) Option {
	cfg, ok := c.(*config.StorageMiner)
	if !ok {
		return Error(xerrors.Errorf("invalid config from repo, got: %T", c))
	}

	return Options(
		ConfigCommon(&cfg.Common),

		If(cfg.Dealmaking.Filter != "",
			Override(new(dtypes.StorageDealFilter), modules.BasicDealFilter(dealfilter.CliStorageDealFilter(cfg.Dealmaking.Filter))),
		),

		If(cfg.Dealmaking.RetrievalFilter != "",
			Override(new(dtypes.RetrievalDealFilter), modules.RetrievalDealFilter(dealfilter.CliRetrievalDealFilter(cfg.Dealmaking.RetrievalFilter))),
		),

		Override(new(*storageadapter.DealPublisher), storageadapter.NewDealPublisher(&cfg.Fees, storageadapter.PublishMsgConfig{
			Period:         time.Duration(cfg.Dealmaking.PublishMsgPeriod),
			MaxDealsPerMsg: cfg.Dealmaking.MaxDealsPerPublishMsg,
		})),
		Override(new(storagemarket.StorageProviderNode), storageadapter.NewProviderNodeAdapter(&cfg.Fees)),

		Override(new(sectorstorage.SealerConfig), cfg.Storage),
		Override(new(*storage.AddressSelector), modules.AddressSelector(&cfg.Addresses)),
		Override(new(*storage.Miner), modules.StorageMiner(cfg.Fees)),
	)
}

func Repo(r repo.Repo) Option {
	return func(settings *Settings) error {
		lr, err := r.Lock(settings.nodeType)
		if err != nil {
			return err
		}
		c, err := lr.Config()
		if err != nil {
			return err
		}

		var cfg *config.Blockstore
		switch settings.nodeType {
		case repo.FullNode:
			cfgp, ok := c.(*config.FullNode)
			if !ok {
				return xerrors.Errorf("invalid config from repo, got: %T", c)
			}
			cfg = &cfgp.Blockstore
		case repo.StorageMiner:
			cfgp, ok := c.(*config.StorageMiner)
			if !ok {
				return xerrors.Errorf("invalid config from repo, got: %T", c)
			}
			cfg = &cfgp.Blockstore
		default:
			cfg = &config.Blockstore{}
		}

		return Options(
			Override(new(repo.LockedRepo), modules.LockedRepo(lr)), // module handles closing

			Override(new(dtypes.MetadataDS), modules.Datastore),
			Override(new(dtypes.UniversalBlockstore), modules.UniversalBlockstore),

			If(cfg.Splitstore,
				If(cfg.UseLMDBHotstore,
					Override(new(dtypes.HotBlockstore), modules.LMDBHotBlockstore)),
				If(!cfg.UseLMDBHotstore,
					Override(new(dtypes.HotBlockstore), modules.BadgerHotBlockstore)),
				Override(new(dtypes.SplitBlockstore), modules.SplitBlockstore(cfg)),
				Override(new(dtypes.ChainBlockstore), modules.ChainSplitBlockstore),
				Override(new(dtypes.StateBlockstore), modules.StateSplitBlockstore),
				Override(new(dtypes.BaseBlockstore), From(new(dtypes.SplitBlockstore))),
				Override(new(dtypes.ExposedBlockstore), From(new(dtypes.SplitBlockstore))),
			),
			If(!cfg.Splitstore,
				Override(new(dtypes.ChainBlockstore), modules.ChainFlatBlockstore),
				Override(new(dtypes.StateBlockstore), modules.StateFlatBlockstore),
				Override(new(dtypes.BaseBlockstore), From(new(dtypes.UniversalBlockstore))),
				Override(new(dtypes.ExposedBlockstore), From(new(dtypes.UniversalBlockstore))),
			),

			If(os.Getenv("LOTUS_ENABLE_CHAINSTORE_FALLBACK") == "1",
				Override(new(dtypes.ChainBlockstore), modules.FallbackChainBlockstore),
				Override(new(dtypes.StateBlockstore), modules.FallbackStateBlockstore),
				Override(SetupFallbackBlockstoresKey, modules.InitFallbackBlockstores),
			),

			Override(new(dtypes.ClientImportMgr), modules.ClientImportMgr),
			Override(new(dtypes.ClientMultiDstore), modules.ClientMultiDatastore),

			Override(new(dtypes.ClientBlockstore), modules.ClientBlockstore),
			Override(new(dtypes.ClientRetrievalStoreManager), modules.ClientRetrievalStoreManager),
			Override(new(ci.PrivKey), lp2p.PrivKey),
			Override(new(ci.PubKey), ci.PrivKey.GetPublic),
			Override(new(peer.ID), peer.IDFromPublicKey),

			Override(new(types.KeyStore), modules.KeyStore),

			Override(new(*dtypes.APIAlg), modules.APISecret),

			ApplyIf(isType(repo.FullNode), ConfigFullNode(c)),
			ApplyIf(isType(repo.StorageMiner), ConfigStorageMiner(c)),
		)(settings)
	}
}

type FullOption = Option

func Lite(enable bool) FullOption {
	return func(s *Settings) error {
		s.Lite = enable
		return nil
	}
}

func FullAPI(out *api.FullNode, fopts ...FullOption) Option {
	return Options(
		func(s *Settings) error {
			s.nodeType = repo.FullNode
			return nil
		},
		Options(fopts...),
		func(s *Settings) error {
			resAPI := &impl.FullNodeAPI{}
			s.invokes[ExtractApiKey] = fx.Populate(resAPI)
			*out = resAPI
			return nil
		},
	)
}

type StopFunc func(context.Context) error

// New builds and starts new Filecoin node
func New(ctx context.Context, opts ...Option) (StopFunc, error) {
	settings := Settings{
		modules: map[interface{}]fx.Option{},
		invokes: make([]fx.Option, _nInvokes),
	}

	// apply module options in the right order
	if err := Options(Options(defaults()...), Options(opts...))(&settings); err != nil {
		return nil, xerrors.Errorf("applying node options failed: %w", err)
	}

	// gather constructors for fx.Options
	ctors := make([]fx.Option, 0, len(settings.modules))
	for _, opt := range settings.modules {
		ctors = append(ctors, opt)
	}

	// fill holes in invokes for use in fx.Options
	for i, opt := range settings.invokes {
		if opt == nil {
			settings.invokes[i] = fx.Options()
		}
	}

	app := fx.New(
		fx.Options(ctors...),
		fx.Options(settings.invokes...),

		fx.NopLogger,
	)

	// TODO: we probably should have a 'firewall' for Closing signal
	//  on this context, and implement closing logic through lifecycles
	//  correctly
	if err := app.Start(ctx); err != nil {
		// comment fx.NopLogger few lines above for easier debugging
		return nil, xerrors.Errorf("starting node: %w", err)
	}

	return app.Stop, nil
}

// In-memory / testing

func Test() Option {
	return Options(
		Unset(RunPeerMgrKey),
		Unset(new(*peermgr.PeerMgr)),
		Override(new(beacon.Schedule), testing.RandomBeacon),
		Override(new(*storageadapter.DealPublisher), storageadapter.NewDealPublisher(nil, storageadapter.PublishMsgConfig{})),
	)
}