package genesis

import (
	"context"
	"fmt"

	"github.com/filecoin-project/go-address"
	"github.com/filecoin-project/specs-actors/actors/abi"
	cbg "github.com/whyrusleeping/cbor-gen"
	"golang.org/x/xerrors"

	"github.com/filecoin-project/lotus/chain/actors"
	"github.com/filecoin-project/lotus/chain/types"
	"github.com/filecoin-project/lotus/chain/vm"
)

func mustEnc(i cbg.CBORMarshaler) []byte {
	enc, err := actors.SerializeParams(i)
	if err != nil {
		panic(err) // ok
	}
	return enc
}

func doExec(ctx context.Context, vm *vm.VM, to, from address.Address, method abi.MethodNum, params []byte) ([]byte, error) {
	return doExecValue(ctx, vm, to, from, types.NewInt(0), method, params)
}

func doExecValue(ctx context.Context, vm *vm.VM, to, from address.Address, value types.BigInt, method abi.MethodNum, params []byte) ([]byte, error) {
	act, err := vm.StateTree().GetActor(from)
	if err != nil {
		return nil, xerrors.Errorf("doExec failed to get from actor: %w", err)
	}

	ret, err := vm.ApplyMessage(ctx, &types.Message{
		To:       to,
		From:     from,
		Method:   method,
		Params:   params,
		GasLimit: types.NewInt(1000000),
		GasPrice: types.NewInt(0),
		Value:    value,
		Nonce:    act.Nonce,
	})
	if err != nil {
		return nil, xerrors.Errorf("doExec apply message failed: %w", err)
	}

	if ret.ExitCode != 0 {
		return nil, fmt.Errorf("failed to call method: %s", ret.ActorErr)
	}

	return ret.Return, nil
}