package api

import (
	"context"
	"fmt"

	sectorbuilder "github.com/filecoin-project/go-sectorbuilder"
	"github.com/ipfs/go-cid"
	"github.com/ipfs/go-filestore"
	cbor "github.com/ipfs/go-ipld-cbor"
	"github.com/libp2p/go-libp2p-core/network"
	"github.com/libp2p/go-libp2p-core/peer"

	"github.com/filecoin-project/lotus/build"
	"github.com/filecoin-project/lotus/chain/actors"
	"github.com/filecoin-project/lotus/chain/address"
	"github.com/filecoin-project/lotus/chain/store"
	"github.com/filecoin-project/lotus/chain/types"
)

func init() {
	cbor.RegisterCborType(SealedRef{})
}

type Common interface {
	// Auth
	AuthVerify(ctx context.Context, token string) ([]Permission, error)
	AuthNew(ctx context.Context, perms []Permission) ([]byte, error)

	// network

	NetConnectedness(context.Context, peer.ID) (network.Connectedness, error)
	NetPeers(context.Context) ([]peer.AddrInfo, error)
	NetConnect(context.Context, peer.AddrInfo) error
	NetAddrsListen(context.Context) (peer.AddrInfo, error)
	NetDisconnect(context.Context, peer.ID) error

	// ID returns peerID of libp2p node backing this API
	ID(context.Context) (peer.ID, error)

	// Version provides information about API provider
	Version(context.Context) (Version, error)
}

// FullNode API is a low-level interface to the Filecoin network full node
type FullNode interface {
	Common

	// chain

	// ChainNotify returns channel with chain head updates
	// First message is guaranteed to be of len == 1, and type == 'current'
	ChainNotify(context.Context) (<-chan []*store.HeadChange, error)
	ChainHead(context.Context) (*types.TipSet, error)
	ChainGetRandomness(context.Context, *types.TipSet, []*types.Ticket, int) ([]byte, error)
	ChainGetBlock(context.Context, cid.Cid) (*types.BlockHeader, error)
	ChainGetTipSet(context.Context, []cid.Cid) (*types.TipSet, error)
	ChainGetBlockMessages(context.Context, cid.Cid) (*BlockMessages, error)
	ChainGetParentReceipts(context.Context, cid.Cid) ([]*types.MessageReceipt, error)
	ChainGetParentMessages(context.Context, cid.Cid) ([]Message, error)
	ChainGetTipSetByHeight(context.Context, uint64, *types.TipSet) (*types.TipSet, error)
	ChainReadObj(context.Context, cid.Cid) ([]byte, error)
	ChainSetHead(context.Context, *types.TipSet) error
	ChainGetGenesis(context.Context) (*types.TipSet, error)
	ChainTipSetWeight(context.Context, *types.TipSet) (types.BigInt, error)

	// syncer
	SyncState(context.Context) (*SyncState, error)
	SyncSubmitBlock(ctx context.Context, blk *types.BlockMsg) error

	// messages
	MpoolPending(context.Context, *types.TipSet) ([]*types.SignedMessage, error)
	MpoolPush(context.Context, *types.SignedMessage) error                          // TODO: remove
	MpoolPushMessage(context.Context, *types.Message) (*types.SignedMessage, error) // get nonce, sign, push
	MpoolGetNonce(context.Context, address.Address) (uint64, error)

	// FullNodeStruct

	// miner

	MinerRegister(context.Context, address.Address) error
	MinerUnregister(context.Context, address.Address) error
	MinerAddresses(context.Context) ([]address.Address, error)
	MinerCreateBlock(context.Context, address.Address, *types.TipSet, []*types.Ticket, types.ElectionProof, []*types.SignedMessage, uint64) (*types.BlockMsg, error)

	// // UX ?

	// wallet

	WalletNew(context.Context, string) (address.Address, error)
	WalletHas(context.Context, address.Address) (bool, error)
	WalletList(context.Context) ([]address.Address, error)
	WalletBalance(context.Context, address.Address) (types.BigInt, error)
	WalletSign(context.Context, address.Address, []byte) (*types.Signature, error)
	WalletSignMessage(context.Context, address.Address, *types.Message) (*types.SignedMessage, error)
	WalletDefaultAddress(context.Context) (address.Address, error)
	WalletSetDefault(context.Context, address.Address) error
	WalletExport(context.Context, address.Address) (*types.KeyInfo, error)
	WalletImport(context.Context, *types.KeyInfo) (address.Address, error)

	// Other

	// ClientImport imports file under the specified path into filestore
	ClientImport(ctx context.Context, path string) (cid.Cid, error)
	ClientStartDeal(ctx context.Context, data cid.Cid, miner address.Address, epochPrice types.BigInt, blocksDuration uint64) (*cid.Cid, error)
	ClientListDeals(ctx context.Context) ([]DealInfo, error)
	ClientHasLocal(ctx context.Context, root cid.Cid) (bool, error)
	ClientFindData(ctx context.Context, root cid.Cid) ([]QueryOffer, error) // TODO: specify serialization mode we want (defaults to unixfs for now)
	ClientRetrieve(ctx context.Context, order RetrievalOrder, path string) error
	ClientQueryAsk(ctx context.Context, p peer.ID, miner address.Address) (*types.SignedStorageAsk, error)

	// ClientUnimport removes references to the specified file from filestore
	//ClientUnimport(path string)

	// ClientListImports lists imported files and their root CIDs
	ClientListImports(ctx context.Context) ([]Import, error)

	//ClientListAsks() []Ask

	// if tipset is nil, we'll use heaviest
	StateCall(context.Context, *types.Message, *types.TipSet) (*types.MessageReceipt, error)
	StateReplay(context.Context, *types.TipSet, cid.Cid) (*ReplayResults, error)
	StateGetActor(ctx context.Context, actor address.Address, ts *types.TipSet) (*types.Actor, error)
	StateReadState(ctx context.Context, act *types.Actor, ts *types.TipSet) (*ActorState, error)

	StateMinerSectors(context.Context, address.Address, *types.TipSet) ([]*SectorInfo, error)
	StateMinerProvingSet(context.Context, address.Address, *types.TipSet) ([]*SectorInfo, error)
	StateMinerPower(context.Context, address.Address, *types.TipSet) (MinerPower, error)
	StateMinerWorker(context.Context, address.Address, *types.TipSet) (address.Address, error)
	StateMinerPeerID(ctx context.Context, m address.Address, ts *types.TipSet) (peer.ID, error)
	StateMinerProvingPeriodEnd(ctx context.Context, actor address.Address, ts *types.TipSet) (uint64, error)
	StateMinerSectorSize(context.Context, address.Address, *types.TipSet) (uint64, error)
	StatePledgeCollateral(context.Context, *types.TipSet) (types.BigInt, error)
	StateWaitMsg(context.Context, cid.Cid) (*MsgWait, error)
	StateListMiners(context.Context, *types.TipSet) ([]address.Address, error)
	StateListActors(context.Context, *types.TipSet) ([]address.Address, error)
	StateMarketBalance(context.Context, address.Address, *types.TipSet) (actors.StorageParticipantBalance, error)
	StateMarketParticipants(context.Context, *types.TipSet) (map[string]actors.StorageParticipantBalance, error)
	StateMarketDeals(context.Context, *types.TipSet) (map[string]actors.OnChainDeal, error)

	PaychGet(ctx context.Context, from, to address.Address, ensureFunds types.BigInt) (*ChannelInfo, error)
	PaychList(context.Context) ([]address.Address, error)
	PaychStatus(context.Context, address.Address) (*PaychStatus, error)
	PaychClose(context.Context, address.Address) (cid.Cid, error)
	PaychAllocateLane(ctx context.Context, ch address.Address) (uint64, error)
	PaychNewPayment(ctx context.Context, from, to address.Address, vouchers []VoucherSpec) (*PaymentInfo, error)
	PaychVoucherCheckValid(context.Context, address.Address, *types.SignedVoucher) error
	PaychVoucherCheckSpendable(context.Context, address.Address, *types.SignedVoucher, []byte, []byte) (bool, error)
	PaychVoucherCreate(context.Context, address.Address, types.BigInt, uint64) (*types.SignedVoucher, error)
	PaychVoucherAdd(context.Context, address.Address, *types.SignedVoucher, []byte, types.BigInt) (types.BigInt, error)
	PaychVoucherList(context.Context, address.Address) ([]*types.SignedVoucher, error)
	PaychVoucherSubmit(context.Context, address.Address, *types.SignedVoucher) (cid.Cid, error)
}

// StorageMiner is a low-level interface to the Filecoin network storage miner node
type StorageMiner interface {
	Common

	ActorAddress(context.Context) (address.Address, error)

	// Temp api for testing
	StoreGarbageData(context.Context) error

	// Get the status of a given sector by ID
	SectorsStatus(context.Context, uint64) (sectorbuilder.SectorSealingStatus, error)

	// List all staged sectors
	SectorsList(context.Context) ([]uint64, error)

	SectorsRefs(context.Context) (map[string][]SealedRef, error)
}

// Version provides various build-time information
type Version struct {
	Version string

	// APIVersion is a binary encoded semver version of the remote implementing
	// this api
	//
	// See APIVersion in build/version.go
	APIVersion uint32

	// TODO: git commit / os / genesis cid?

	// Seconds
	BlockDelay uint64
}

func (v Version) String() string {
	vM, vm, vp := build.VersionInts(v.APIVersion)
	return fmt.Sprintf("%s+api%d.%d.%d", v.Version, vM, vm, vp)
}

type Import struct {
	Status   filestore.Status
	Key      cid.Cid
	FilePath string
	Size     uint64
}

type DealInfo struct {
	ProposalCid cid.Cid
	State       DealState
	Provider    address.Address

	PieceRef []byte // cid bytes
	Size     uint64

	PricePerEpoch types.BigInt
	Duration      uint64
}

type MsgWait struct {
	Receipt types.MessageReceipt
	TipSet  *types.TipSet
}

type BlockMessages struct {
	BlsMessages   []*types.Message
	SecpkMessages []*types.SignedMessage

	Cids []cid.Cid
}

type Message struct {
	Cid     cid.Cid
	Message *types.Message
}

type SectorInfo struct {
	SectorID uint64
	CommD    []byte
	CommR    []byte
}

type ActorState struct {
	Balance types.BigInt
	State   interface{}
}

type PCHDir int

const (
	PCHUndef PCHDir = iota
	PCHInbound
	PCHOutbound
)

type PaychStatus struct {
	ControlAddr address.Address
	Direction   PCHDir
}

type ChannelInfo struct {
	Channel        address.Address
	ChannelMessage cid.Cid
}

type PaymentInfo struct {
	Channel        address.Address
	ChannelMessage *cid.Cid
	Vouchers       []*types.SignedVoucher
}

type VoucherSpec struct {
	Amount   types.BigInt
	TimeLock uint64
	MinClose uint64

	Extra *types.ModVerifyParams
}

type MinerPower struct {
	MinerPower types.BigInt
	TotalPower types.BigInt
}

type SealedRef struct {
	Piece  string
	Offset uint64
	Size   uint32
}

type QueryOffer struct {
	Err string

	Root cid.Cid

	Size     uint64
	MinPrice types.BigInt

	Miner       address.Address
	MinerPeerID peer.ID
}

func (o *QueryOffer) Order() RetrievalOrder {
	return RetrievalOrder{
		Root:  o.Root,
		Size:  o.Size,
		Total: o.MinPrice,

		Miner:       o.Miner,
		MinerPeerID: o.MinerPeerID,
	}
}

type RetrievalOrder struct {
	// TODO: make this less unixfs specific
	Root cid.Cid
	Size uint64
	// TODO: support offset
	Total types.BigInt

	Client      address.Address
	Miner       address.Address
	MinerPeerID peer.ID
}

type ReplayResults struct {
	Msg     *types.Message
	Receipt *types.MessageReceipt
	Error   string
}

type SyncState struct {
	Base   *types.TipSet
	Target *types.TipSet

	Stage  SyncStateStage
	Height uint64
}

type SyncStateStage int

const (
	StageIdle = SyncStateStage(iota)
	StageHeaders
	StagePersistHeaders
	StageMessages
	StageSyncComplete
)