package main

import (
	"fmt"

	"github.com/urfave/cli/v2"
	"golang.org/x/xerrors"

	"github.com/filecoin-project/go-address"
	"github.com/filecoin-project/go-state-types/abi"
	"github.com/filecoin-project/go-state-types/big"
	"github.com/filecoin-project/lotus/api"

	miner2 "github.com/filecoin-project/specs-actors/v2/actors/builtin/miner"

	"github.com/filecoin-project/lotus/build"
	"github.com/filecoin-project/lotus/chain/actors"
	"github.com/filecoin-project/lotus/chain/actors/builtin/miner"
	"github.com/filecoin-project/lotus/chain/types"
	lcli "github.com/filecoin-project/lotus/cli"
)

var actorCmd = &cli.Command{
	Name:  "actor",
	Usage: "manipulate the miner actor",
	Subcommands: []*cli.Command{
		actorWithdrawCmd,
		actorSetOwnerCmd,
		actorControl,
		actorProposeChangeWorker,
		actorConfirmChangeWorker,
	},
}

var actorWithdrawCmd = &cli.Command{
	Name:      "withdraw",
	Usage:     "withdraw available balance",
	ArgsUsage: "[amount (FIL)]",
	Flags: []cli.Flag{
		&cli.StringFlag{
			Name:  "actor",
			Usage: "specify the address of miner actor",
		},
	},
	Action: func(cctx *cli.Context) error {
		var maddr address.Address
		if act := cctx.String("actor"); act != "" {
			var err error
			maddr, err = address.NewFromString(act)
			if err != nil {
				return fmt.Errorf("parsing address %s: %w", act, err)
			}
		}

		nodeAPI, acloser, err := lcli.GetFullNodeAPI(cctx)
		if err != nil {
			return err
		}
		defer acloser()

		ctx := lcli.ReqContext(cctx)

		if maddr.Empty() {
			minerAPI, closer, err := lcli.GetStorageMinerAPI(cctx)
			if err != nil {
				return err
			}
			defer closer()

			maddr, err = minerAPI.ActorAddress(ctx)
			if err != nil {
				return err
			}
		}

		mi, err := nodeAPI.StateMinerInfo(ctx, maddr, types.EmptyTSK)
		if err != nil {
			return err
		}

		available, err := nodeAPI.StateMinerAvailableBalance(ctx, maddr, types.EmptyTSK)
		if err != nil {
			return err
		}

		amount := available
		if cctx.Args().Present() {
			f, err := types.ParseFIL(cctx.Args().First())
			if err != nil {
				return xerrors.Errorf("parsing 'amount' argument: %w", err)
			}

			amount = abi.TokenAmount(f)

			if amount.GreaterThan(available) {
				return xerrors.Errorf("can't withdraw more funds than available; requested: %s; available: %s", amount, available)
			}
		}

		params, err := actors.SerializeParams(&miner2.WithdrawBalanceParams{
			AmountRequested: amount, // Default to attempting to withdraw all the extra funds in the miner actor
		})
		if err != nil {
			return err
		}

		smsg, err := nodeAPI.MpoolPushMessage(ctx, &types.Message{
			To:     maddr,
			From:   mi.Owner,
			Value:  types.NewInt(0),
			Method: miner.Methods.WithdrawBalance,
			Params: params,
		}, &api.MessageSendSpec{MaxFee: abi.TokenAmount(types.MustParseFIL("0.1"))})
		if err != nil {
			return err
		}

		fmt.Printf("Requested rewards withdrawal in message %s\n", smsg.Cid())

		return nil
	},
}

var actorSetOwnerCmd = &cli.Command{
	Name:      "set-owner",
	Usage:     "Set owner address (this command should be invoked twice, first with the old owner as the senderAddress, and then with the new owner)",
	ArgsUsage: "[newOwnerAddress senderAddress]",
	Flags: []cli.Flag{
		&cli.StringFlag{
			Name:  "actor",
			Usage: "specify the address of miner actor",
		},
		&cli.BoolFlag{
			Name:  "really-do-it",
			Usage: "Actually send transaction performing the action",
			Value: false,
		},
	},
	Action: func(cctx *cli.Context) error {
		if !cctx.Bool("really-do-it") {
			fmt.Println("Pass --really-do-it to actually execute this action")
			return nil
		}

		if cctx.NArg() != 2 {
			return fmt.Errorf("must pass new owner address and sender address")
		}

		var maddr address.Address
		if act := cctx.String("actor"); act != "" {
			var err error
			maddr, err = address.NewFromString(act)
			if err != nil {
				return fmt.Errorf("parsing address %s: %w", act, err)
			}
		}

		nodeAPI, acloser, err := lcli.GetFullNodeAPI(cctx)
		if err != nil {
			return err
		}
		defer acloser()

		ctx := lcli.ReqContext(cctx)

		na, err := address.NewFromString(cctx.Args().First())
		if err != nil {
			return err
		}

		newAddrId, err := nodeAPI.StateLookupID(ctx, na, types.EmptyTSK)
		if err != nil {
			return err
		}

		fa, err := address.NewFromString(cctx.Args().Get(1))
		if err != nil {
			return err
		}

		fromAddrId, err := nodeAPI.StateLookupID(ctx, fa, types.EmptyTSK)
		if err != nil {
			return err
		}

		if maddr.Empty() {
			minerAPI, closer, err := lcli.GetStorageMinerAPI(cctx)
			if err != nil {
				return err
			}
			defer closer()

			maddr, err = minerAPI.ActorAddress(ctx)
			if err != nil {
				return err
			}
		}

		mi, err := nodeAPI.StateMinerInfo(ctx, maddr, types.EmptyTSK)
		if err != nil {
			return err
		}

		if fromAddrId != mi.Owner && fromAddrId != newAddrId {
			return xerrors.New("from address must either be the old owner or the new owner")
		}

		sp, err := actors.SerializeParams(&newAddrId)
		if err != nil {
			return xerrors.Errorf("serializing params: %w", err)
		}

		smsg, err := nodeAPI.MpoolPushMessage(ctx, &types.Message{
			From:   fromAddrId,
			To:     maddr,
			Method: miner.Methods.ChangeOwnerAddress,
			Value:  big.Zero(),
			Params: sp,
		}, nil)
		if err != nil {
			return xerrors.Errorf("mpool push: %w", err)
		}

		fmt.Println("Message CID:", smsg.Cid())

		// wait for it to get mined into a block
		wait, err := nodeAPI.StateWaitMsg(ctx, smsg.Cid(), build.MessageConfidence)
		if err != nil {
			return err
		}

		// check it executed successfully
		if wait.Receipt.ExitCode != 0 {
			fmt.Println("owner change failed!")
			return err
		}

		fmt.Println("message succeeded!")

		return nil
	},
}

var actorControl = &cli.Command{
	Name:  "control",
	Usage: "Manage control addresses",
	Subcommands: []*cli.Command{
		actorControlSet,
	},
}

var actorControlSet = &cli.Command{
	Name:      "set",
	Usage:     "Set control address(-es)",
	ArgsUsage: "[...address]",
	Flags: []cli.Flag{
		&cli.StringFlag{
			Name:  "actor",
			Usage: "specify the address of miner actor",
		},
		&cli.BoolFlag{
			Name:  "really-do-it",
			Usage: "Actually send transaction performing the action",
			Value: false,
		},
	},
	Action: func(cctx *cli.Context) error {
		if !cctx.Bool("really-do-it") {
			fmt.Println("Pass --really-do-it to actually execute this action")
			return nil
		}

		var maddr address.Address
		if act := cctx.String("actor"); act != "" {
			var err error
			maddr, err = address.NewFromString(act)
			if err != nil {
				return fmt.Errorf("parsing address %s: %w", act, err)
			}
		}

		nodeAPI, acloser, err := lcli.GetFullNodeAPI(cctx)
		if err != nil {
			return err
		}
		defer acloser()

		ctx := lcli.ReqContext(cctx)

		if maddr.Empty() {
			minerAPI, closer, err := lcli.GetStorageMinerAPI(cctx)
			if err != nil {
				return err
			}
			defer closer()

			maddr, err = minerAPI.ActorAddress(ctx)
			if err != nil {
				return err
			}
		}

		mi, err := nodeAPI.StateMinerInfo(ctx, maddr, types.EmptyTSK)
		if err != nil {
			return err
		}

		del := map[address.Address]struct{}{}
		existing := map[address.Address]struct{}{}
		for _, controlAddress := range mi.ControlAddresses {
			ka, err := nodeAPI.StateAccountKey(ctx, controlAddress, types.EmptyTSK)
			if err != nil {
				return err
			}

			del[ka] = struct{}{}
			existing[ka] = struct{}{}
		}

		var toSet []address.Address

		for i, as := range cctx.Args().Slice() {
			a, err := address.NewFromString(as)
			if err != nil {
				return xerrors.Errorf("parsing address %d: %w", i, err)
			}

			ka, err := nodeAPI.StateAccountKey(ctx, a, types.EmptyTSK)
			if err != nil {
				return err
			}

			// make sure the address exists on chain
			_, err = nodeAPI.StateLookupID(ctx, ka, types.EmptyTSK)
			if err != nil {
				return xerrors.Errorf("looking up %s: %w", ka, err)
			}

			delete(del, ka)
			toSet = append(toSet, ka)
		}

		for a := range del {
			fmt.Println("Remove", a)
		}
		for _, a := range toSet {
			if _, exists := existing[a]; !exists {
				fmt.Println("Add", a)
			}
		}

		cwp := &miner2.ChangeWorkerAddressParams{
			NewWorker:       mi.Worker,
			NewControlAddrs: toSet,
		}

		sp, err := actors.SerializeParams(cwp)
		if err != nil {
			return xerrors.Errorf("serializing params: %w", err)
		}

		smsg, err := nodeAPI.MpoolPushMessage(ctx, &types.Message{
			From:   mi.Owner,
			To:     maddr,
			Method: miner.Methods.ChangeWorkerAddress,

			Value:  big.Zero(),
			Params: sp,
		}, nil)
		if err != nil {
			return xerrors.Errorf("mpool push: %w", err)
		}

		fmt.Println("Message CID:", smsg.Cid())

		return nil
	},
}

var actorProposeChangeWorker = &cli.Command{
	Name:      "propose-change-worker",
	Usage:     "Propose a worker address change",
	ArgsUsage: "[address]",
	Flags: []cli.Flag{
		&cli.StringFlag{
			Name:  "actor",
			Usage: "specify the address of miner actor",
		},
		&cli.BoolFlag{
			Name:  "really-do-it",
			Usage: "Actually send transaction performing the action",
			Value: false,
		},
	},
	Action: func(cctx *cli.Context) error {
		if !cctx.Args().Present() {
			return fmt.Errorf("must pass address of new worker address")
		}

		if !cctx.Bool("really-do-it") {
			fmt.Fprintln(cctx.App.Writer, "Pass --really-do-it to actually execute this action")
			return nil
		}

		var maddr address.Address
		if act := cctx.String("actor"); act != "" {
			var err error
			maddr, err = address.NewFromString(act)
			if err != nil {
				return fmt.Errorf("parsing address %s: %w", act, err)
			}
		}

		nodeAPI, acloser, err := lcli.GetFullNodeAPI(cctx)
		if err != nil {
			return err
		}
		defer acloser()

		ctx := lcli.ReqContext(cctx)

		na, err := address.NewFromString(cctx.Args().First())
		if err != nil {
			return err
		}

		newAddr, err := nodeAPI.StateLookupID(ctx, na, types.EmptyTSK)
		if err != nil {
			return err
		}

		if maddr.Empty() {
			minerAPI, closer, err := lcli.GetStorageMinerAPI(cctx)
			if err != nil {
				return err
			}
			defer closer()

			maddr, err = minerAPI.ActorAddress(ctx)
			if err != nil {
				return err
			}
		}

		mi, err := nodeAPI.StateMinerInfo(ctx, maddr, types.EmptyTSK)
		if err != nil {
			return err
		}

		if mi.NewWorker.Empty() {
			if mi.Worker == newAddr {
				return fmt.Errorf("worker address already set to %s", na)
			}
		} else {
			if mi.NewWorker == newAddr {
				return fmt.Errorf("change to worker address %s already pending", na)
			}
		}

		cwp := &miner2.ChangeWorkerAddressParams{
			NewWorker:       newAddr,
			NewControlAddrs: mi.ControlAddresses,
		}

		sp, err := actors.SerializeParams(cwp)
		if err != nil {
			return xerrors.Errorf("serializing params: %w", err)
		}

		smsg, err := nodeAPI.MpoolPushMessage(ctx, &types.Message{
			From:   mi.Owner,
			To:     maddr,
			Method: miner.Methods.ChangeWorkerAddress,
			Value:  big.Zero(),
			Params: sp,
		}, nil)
		if err != nil {
			return xerrors.Errorf("mpool push: %w", err)
		}

		fmt.Fprintln(cctx.App.Writer, "Propose Message CID:", smsg.Cid())

		// wait for it to get mined into a block
		wait, err := nodeAPI.StateWaitMsg(ctx, smsg.Cid(), build.MessageConfidence)
		if err != nil {
			return err
		}

		// check it executed successfully
		if wait.Receipt.ExitCode != 0 {
			fmt.Fprintln(cctx.App.Writer, "Propose worker change failed!")
			return err
		}

		mi, err = nodeAPI.StateMinerInfo(ctx, maddr, wait.TipSet)
		if err != nil {
			return err
		}
		if mi.NewWorker != newAddr {
			return fmt.Errorf("Proposed worker address change not reflected on chain: expected '%s', found '%s'", na, mi.NewWorker)
		}

		fmt.Fprintf(cctx.App.Writer, "Worker key change to %s successfully proposed.\n", na)
		fmt.Fprintf(cctx.App.Writer, "Call 'confirm-change-worker' at or after height %d to complete.\n", mi.WorkerChangeEpoch)

		return nil
	},
}

var actorConfirmChangeWorker = &cli.Command{
	Name:      "confirm-change-worker",
	Usage:     "Confirm a worker address change",
	ArgsUsage: "[address]",
	Flags: []cli.Flag{
		&cli.StringFlag{
			Name:  "actor",
			Usage: "specify the address of miner actor",
		},
		&cli.BoolFlag{
			Name:  "really-do-it",
			Usage: "Actually send transaction performing the action",
			Value: false,
		},
	},
	Action: func(cctx *cli.Context) error {
		if !cctx.Args().Present() {
			return fmt.Errorf("must pass address of new worker address")
		}

		if !cctx.Bool("really-do-it") {
			fmt.Fprintln(cctx.App.Writer, "Pass --really-do-it to actually execute this action")
			return nil
		}

		var maddr address.Address
		if act := cctx.String("actor"); act != "" {
			var err error
			maddr, err = address.NewFromString(act)
			if err != nil {
				return fmt.Errorf("parsing address %s: %w", act, err)
			}
		}

		nodeAPI, acloser, err := lcli.GetFullNodeAPI(cctx)
		if err != nil {
			return err
		}
		defer acloser()

		ctx := lcli.ReqContext(cctx)

		na, err := address.NewFromString(cctx.Args().First())
		if err != nil {
			return err
		}

		newAddr, err := nodeAPI.StateLookupID(ctx, na, types.EmptyTSK)
		if err != nil {
			return err
		}

		if maddr.Empty() {
			minerAPI, closer, err := lcli.GetStorageMinerAPI(cctx)
			if err != nil {
				return err
			}
			defer closer()

			maddr, err = minerAPI.ActorAddress(ctx)
			if err != nil {
				return err
			}
		}

		mi, err := nodeAPI.StateMinerInfo(ctx, maddr, types.EmptyTSK)
		if err != nil {
			return err
		}

		if mi.NewWorker.Empty() {
			return xerrors.Errorf("no worker key change proposed")
		} else if mi.NewWorker != newAddr {
			return xerrors.Errorf("worker key %s does not match current worker key proposal %s", newAddr, mi.NewWorker)
		}

		if head, err := nodeAPI.ChainHead(ctx); err != nil {
			return xerrors.Errorf("failed to get the chain head: %w", err)
		} else if head.Height() < mi.WorkerChangeEpoch {
			return xerrors.Errorf("worker key change cannot be confirmed until %d, current height is %d", mi.WorkerChangeEpoch, head.Height())
		}

		smsg, err := nodeAPI.MpoolPushMessage(ctx, &types.Message{
			From:   mi.Owner,
			To:     maddr,
			Method: miner.Methods.ConfirmUpdateWorkerKey,
			Value:  big.Zero(),
		}, nil)
		if err != nil {
			return xerrors.Errorf("mpool push: %w", err)
		}

		fmt.Fprintln(cctx.App.Writer, "Confirm Message CID:", smsg.Cid())

		// wait for it to get mined into a block
		wait, err := nodeAPI.StateWaitMsg(ctx, smsg.Cid(), build.MessageConfidence)
		if err != nil {
			return err
		}

		// check it executed successfully
		if wait.Receipt.ExitCode != 0 {
			fmt.Fprintln(cctx.App.Writer, "Worker change failed!")
			return err
		}

		mi, err = nodeAPI.StateMinerInfo(ctx, maddr, wait.TipSet)
		if err != nil {
			return err
		}
		if mi.Worker != newAddr {
			return fmt.Errorf("Confirmed worker address change not reflected on chain: expected '%s', found '%s'", newAddr, mi.Worker)
		}

		return nil
	},
}