// VulcanizeDB
// Copyright © 2023 Vulcanize

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.

// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package payments

import (
	"sync"

	"github.com/cerc-io/ipld-eth-server/v5/pkg/log"
	"github.com/ethereum/go-ethereum/common"
	"github.com/statechannels/go-nitro/node/engine"
	"github.com/statechannels/go-nitro/node/engine/chainservice"
	"github.com/statechannels/go-nitro/node/engine/store"

	nitroNode "github.com/statechannels/go-nitro/node"
	p2pms "github.com/statechannels/go-nitro/node/engine/messageservice/p2p-message-service"
)

// TODO: Implement
// Struct representing payments manager
// Maintains either an in-process or communication with an out-of-process Nitro node
type PaymentsManager struct {
	// Whether to run an in-process Nitro node
	runInProcessNitroNode bool

	// In-process Nitro node; nil when runInProcessNitroNode is false
	nitroNode *nitroNode.Node

	// Used to signal shutdown of the service
	quitChan chan bool
}

func NewPaymentsManager(runInProcessNitroNode bool) (PaymentsManager, error) {
	// TODO: Implement
	var err error

	pm := PaymentsManager{runInProcessNitroNode: runInProcessNitroNode}

	if runInProcessNitroNode {
		pm.nitroNode, err = initializeNitroNode()
		if err != nil {
			return PaymentsManager{}, err
		}
	}

	return pm, nil
}

func (pm *PaymentsManager) Start(wg *sync.WaitGroup) {
	// TODO: Implement
	go func() {
		wg.Add(1)
		defer wg.Done()
		<-pm.quitChan
	}()
}

func (pm *PaymentsManager) Stop() error {
	// TODO: Implement
	close(pm.quitChan)
	return nil
}

func initializeNitroNode() (*nitroNode.Node, error) {
	// TODO: Configure
	pkString := ""
	useDurableStore := true
	durableStoreFolder := "./data/nitro-store"
	msgPort := 3005
	wsMsgPort := 5005
	chainUrl := "ws://127.0.0.1:8546"
	chainStartBlock := uint64(0)
	chainPk := ""
	naAddress := ""
	vpaAddress := ""
	caAddress := ""

	chainAuthToken := ""
	publicIp := "0.0.0.0"

	chainOpts := chainservice.ChainOpts{
		ChainUrl:        chainUrl,
		ChainStartBlock: chainStartBlock,
		ChainAuthToken:  chainAuthToken,
		ChainPk:         chainPk,
		NaAddress:       common.HexToAddress(naAddress),
		VpaAddress:      common.HexToAddress(vpaAddress),
		CaAddress:       common.HexToAddress(caAddress),
	}

	storeOpts := store.StoreOpts{
		PkBytes:            common.Hex2Bytes(pkString),
		UseDurableStore:    useDurableStore,
		DurableStoreFolder: durableStoreFolder,
	}

	peerSlice := []string{}

	messageOpts := p2pms.MessageOpts{
		PkBytes:   common.Hex2Bytes(pkString),
		TcpPort:   msgPort,
		WsMsgPort: wsMsgPort,
		BootPeers: peerSlice,
		PublicIp:  publicIp,
	}

	ourStore, err := store.NewStore(storeOpts)
	if err != nil {
		return nil, err
	}

	log.Info("Initializing message service", "tcp port", messageOpts.TcpPort, "web socket port", messageOpts.WsMsgPort)
	messageOpts.SCAddr = *ourStore.GetAddress()
	messageService := p2pms.NewMessageService(messageOpts)

	// Compare chainOpts.ChainStartBlock to lastBlockNum seen in store. The larger of the two
	// gets passed as an argument when creating NewEthChainService
	storeBlockNum, err := ourStore.GetLastBlockNumSeen()
	if err != nil {
		return nil, err
	}
	if storeBlockNum > chainOpts.ChainStartBlock {
		chainOpts.ChainStartBlock = storeBlockNum
	}

	log.Info("Initializing chain service...")
	ourChain, err := chainservice.NewEthChainService(chainOpts)
	if err != nil {
		return nil, err
	}

	node := nitroNode.New(
		messageService,
		ourChain,
		ourStore,
		&engine.PermissivePolicy{},
	)

	return &node, nil
}