package node

import (
	"context"

	"github.com/filecoin-project/go-lotus/api"
	"github.com/filecoin-project/go-lotus/build"
	"github.com/filecoin-project/go-lotus/chain"
	"github.com/filecoin-project/go-lotus/chain/address"
	"github.com/filecoin-project/go-lotus/chain/types"
	"github.com/filecoin-project/go-lotus/miner"
	"github.com/filecoin-project/go-lotus/node/client"

	"github.com/ipfs/go-cid"
	"github.com/libp2p/go-libp2p-core/host"
	"github.com/libp2p/go-libp2p-core/peer"
	pubsub "github.com/libp2p/go-libp2p-pubsub"
	ma "github.com/multiformats/go-multiaddr"
)

type API struct {
	client.LocalStorage

	Host   host.Host
	Chain  *chain.ChainStore
	PubSub *pubsub.PubSub
	Mpool  *chain.MessagePool
	Wallet *chain.Wallet
}

func (a *API) ChainSubmitBlock(ctx context.Context, blk *chain.BlockMsg) error {
	if err := a.Chain.AddBlock(blk.Header); err != nil {
		return err
	}

	b, err := blk.Serialize()
	if err != nil {
		return err
	}

	// TODO: anything else to do here?
	return a.PubSub.Publish("/fil/blocks", b)
}

func (a *API) ChainHead(context.Context) (*chain.TipSet, error) {
	return a.Chain.GetHeaviestTipSet(), nil
}

func (a *API) ChainGetRandomness(ctx context.Context, pts *chain.TipSet) ([]byte, error) {
	// TODO: this needs to look back in the chain for the right random beacon value
	return []byte("foo bar random"), nil
}

func (a *API) ChainWaitMsg(ctx context.Context, msg cid.Cid) (*api.MsgWait, error) {
	panic("TODO")
}

func (a *API) ID(context.Context) (peer.ID, error) {
	return a.Host.ID(), nil
}

func (a *API) Version(context.Context) (api.Version, error) {
	return api.Version{
		Version: build.Version,
	}, nil
}

func (a *API) MpoolPending(ctx context.Context, ts *chain.TipSet) ([]*chain.SignedMessage, error) {
	// TODO: need to make sure we don't return messages that were already included in the referenced chain
	// also need to accept ts == nil just fine, assume nil == chain.Head()
	return a.Mpool.Pending(), nil
}

func (a *API) MpoolPush(ctx context.Context, smsg *chain.SignedMessage) error {
	msgb, err := smsg.Serialize()
	if err != nil {
		return err
	}

	return a.PubSub.Publish("/fil/messages", msgb)
}

func (a *API) MpoolGetNonce(ctx context.Context, addr address.Address) (uint64, error) {
	return a.Mpool.GetNonce(addr)
}

func (a *API) MinerStart(ctx context.Context, addr address.Address) error {
	// hrm...
	m := miner.NewMiner(a, addr)

	go m.Mine(context.TODO())

	return nil
}

func (a *API) MinerCreateBlock(ctx context.Context, addr address.Address, parents *chain.TipSet, tickets []chain.Ticket, proof chain.ElectionProof, msgs []*chain.SignedMessage) (*chain.BlockMsg, error) {
	fblk, err := chain.MinerCreateBlock(a.Chain, addr, parents, tickets, proof, msgs)
	if err != nil {
		return nil, err
	}

	var out chain.BlockMsg
	out.Header = fblk.Header
	for _, msg := range fblk.Messages {
		out.Messages = append(out.Messages, msg.Cid())
	}

	return &out, nil
}

func (a *API) NetPeers(context.Context) ([]peer.AddrInfo, error) {
	conns := a.Host.Network().Conns()
	out := make([]peer.AddrInfo, len(conns))

	for i, conn := range conns {
		out[i] = peer.AddrInfo{
			ID: conn.RemotePeer(),
			Addrs: []ma.Multiaddr{
				conn.RemoteMultiaddr(),
			},
		}
	}

	return out, nil
}

func (a *API) WalletNew(ctx context.Context, typ string) (address.Address, error) {
	return a.Wallet.GenerateKey(typ)
}

func (a *API) WalletList(ctx context.Context) ([]address.Address, error) {
	return a.Wallet.ListAddrs()
}

func (a *API) WalletBalance(ctx context.Context, addr address.Address) (types.BigInt, error) {
	return a.Chain.GetBalance(addr)
}

func (a *API) WalletSign(ctx context.Context, k address.Address, msg []byte) (*chain.Signature, error) {
	return a.Wallet.Sign(k, msg)
}

func (a *API) WalletDefaultAddress(ctx context.Context) (address.Address, error) {
	addrs, err := a.Wallet.ListAddrs()
	if err != nil {
		return address.Undef, err
	}

	// TODO: store a default address in the config or 'wallet' portion of the repo
	return addrs[0], nil
}

func (a *API) NetConnect(ctx context.Context, p peer.AddrInfo) error {
	return a.Host.Connect(ctx, p)
}

func (a *API) NetAddrsListen(context.Context) (peer.AddrInfo, error) {
	return peer.AddrInfo{
		ID:    a.Host.ID(),
		Addrs: a.Host.Addrs(),
	}, nil
}

var _ api.API = &API{}