package op_e2e

import (
	"context"
	"crypto/ecdsa"
	"fmt"
	"math/big"
	"os"
	"path"
	"strings"
	"testing"
	"time"

	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/common/hexutil"
	"github.com/ethereum/go-ethereum/core"
	geth_eth "github.com/ethereum/go-ethereum/eth"
	"github.com/ethereum/go-ethereum/ethclient"
	"github.com/ethereum/go-ethereum/log"
	"github.com/ethereum/go-ethereum/node"
	"github.com/ethereum/go-ethereum/rpc"
	mocknet "github.com/libp2p/go-libp2p/p2p/net/mock"
	"github.com/stretchr/testify/require"

	bss "github.com/ethereum-optimism/optimism/op-batcher"
	"github.com/ethereum-optimism/optimism/op-bindings/predeploys"
	"github.com/ethereum-optimism/optimism/op-chain-ops/genesis"
	"github.com/ethereum-optimism/optimism/op-e2e/e2eutils"
	"github.com/ethereum-optimism/optimism/op-node/eth"
	"github.com/ethereum-optimism/optimism/op-node/metrics"
	rollupNode "github.com/ethereum-optimism/optimism/op-node/node"
	"github.com/ethereum-optimism/optimism/op-node/p2p"
	"github.com/ethereum-optimism/optimism/op-node/rollup"
	"github.com/ethereum-optimism/optimism/op-node/rollup/driver"
	"github.com/ethereum-optimism/optimism/op-node/testlog"
	l2os "github.com/ethereum-optimism/optimism/op-proposer"
	oplog "github.com/ethereum-optimism/optimism/op-service/log"
)

var (
	testingJWTSecret = [32]byte{123}
)

func DefaultSystemConfig(t *testing.T) SystemConfig {
	secrets, err := e2eutils.DefaultMnemonicConfig.Secrets()
	require.NoError(t, err)
	addresses := secrets.Addresses()

	deployConfig := &genesis.DeployConfig{
		L1ChainID:   900,
		L2ChainID:   901,
		L2BlockTime: 2,

		FinalizationPeriodSeconds: 60 * 60 * 24,
		MaxSequencerDrift:         10,
		SequencerWindowSize:       30,
		ChannelTimeout:            10,
		P2PSequencerAddress:       addresses.SequencerP2P,
		BatchInboxAddress:         common.Address{0: 0x52, 19: 0xff}, // tbd
		BatchSenderAddress:        addresses.Batcher,

		L2OutputOracleSubmissionInterval: 4,
		L2OutputOracleStartingTimestamp:  -1,
		L2OutputOracleProposer:           addresses.Proposer,
		L2OutputOracleChallenger:         common.Address{}, // tbd

		FinalSystemOwner: addresses.SysCfgOwner,

		L1BlockTime:                 2,
		L1GenesisBlockNonce:         4660,
		CliqueSignerAddress:         addresses.CliqueSigner,
		L1GenesisBlockTimestamp:     hexutil.Uint64(time.Now().Unix()),
		L1GenesisBlockGasLimit:      8_000_000,
		L1GenesisBlockDifficulty:    uint642big(1),
		L1GenesisBlockMixHash:       common.Hash{},
		L1GenesisBlockCoinbase:      common.Address{},
		L1GenesisBlockNumber:        0,
		L1GenesisBlockGasUsed:       0,
		L1GenesisBlockParentHash:    common.Hash{},
		L1GenesisBlockBaseFeePerGas: uint642big(7),

		L2GenesisBlockNonce:         0,
		L2GenesisBlockExtraData:     []byte{},
		L2GenesisBlockGasLimit:      8_000_000,
		L2GenesisBlockDifficulty:    uint642big(1),
		L2GenesisBlockMixHash:       common.Hash{},
		L2GenesisBlockCoinbase:      common.Address{0: 0x12},
		L2GenesisBlockNumber:        0,
		L2GenesisBlockGasUsed:       0,
		L2GenesisBlockParentHash:    common.Hash{},
		L2GenesisBlockBaseFeePerGas: uint642big(7),

		GasPriceOracleOverhead: 2100,
		GasPriceOracleScalar:   1_000_000,

		DeploymentWaitConfirmations: 1,

		EIP1559Elasticity:  2,
		EIP1559Denominator: 8,

		FundDevAccounts: true,
	}

	if err := deployConfig.InitDeveloperDeployedAddresses(); err != nil {
		panic(err)
	}

	return SystemConfig{
		Secrets: secrets,

		Premine: make(map[common.Address]*big.Int),

		DeployConfig:           deployConfig,
		L1InfoPredeployAddress: predeploys.L1BlockAddr,
		JWTFilePath:            writeDefaultJWT(t),
		JWTSecret:              testingJWTSecret,
		Nodes: map[string]*rollupNode.Config{
			"verifier": {
				Driver: driver.Config{
					VerifierConfDepth:  0,
					SequencerConfDepth: 0,
					SequencerEnabled:   false,
				},
				L1EpochPollInterval: time.Second * 4,
			},
			"sequencer": {
				Driver: driver.Config{
					VerifierConfDepth:  0,
					SequencerConfDepth: 0,
					SequencerEnabled:   true,
				},
				// Submitter PrivKey is set in system start for rollup nodes where sequencer = true
				RPC: rollupNode.RPCConfig{
					ListenAddr:  "127.0.0.1",
					ListenPort:  0,
					EnableAdmin: true,
				},
				L1EpochPollInterval: time.Second * 4,
			},
		},
		Loggers: map[string]log.Logger{
			"verifier":  testlog.Logger(t, log.LvlInfo).New("role", "verifier"),
			"sequencer": testlog.Logger(t, log.LvlInfo).New("role", "sequencer"),
			"batcher":   testlog.Logger(t, log.LvlInfo).New("role", "batcher"),
			"proposer":  testlog.Logger(t, log.LvlCrit).New("role", "proposer"),
		},
		P2PTopology:           nil, // no P2P connectivity by default
		NonFinalizedProposals: false,
	}
}

func writeDefaultJWT(t *testing.T) string {
	// Sadly the geth node config cannot load JWT secret from memory, it has to be a file
	jwtPath := path.Join(t.TempDir(), "jwt_secret")
	if err := os.WriteFile(jwtPath, []byte(hexutil.Encode(testingJWTSecret[:])), 0600); err != nil {
		t.Fatalf("failed to prepare jwt file for geth: %v", err)
	}
	return jwtPath
}

type DepositContractConfig struct {
	L2Oracle           common.Address
	FinalizationPeriod *big.Int
}

type SystemConfig struct {
	Secrets                *e2eutils.Secrets
	L1InfoPredeployAddress common.Address

	DeployConfig *genesis.DeployConfig

	JWTFilePath string
	JWTSecret   [32]byte

	Premine        map[common.Address]*big.Int
	Nodes          map[string]*rollupNode.Config // Per node config. Don't use populate rollup.Config
	Loggers        map[string]log.Logger
	ProposerLogger log.Logger
	BatcherLogger  log.Logger

	// map of outbound connections to other nodes. Node names prefixed with "~" are unconnected but linked.
	// A nil map disables P2P completely.
	// Any node name not in the topology will not have p2p enabled.
	P2PTopology map[string][]string

	// If the proposer can make proposals for L2 blocks derived from L1 blocks which are not finalized on L1 yet.
	NonFinalizedProposals bool
}

type System struct {
	cfg SystemConfig

	RollupConfig *rollup.Config

	// Connections to running nodes
	Nodes             map[string]*node.Node
	Backends          map[string]*geth_eth.Ethereum
	Clients           map[string]*ethclient.Client
	RollupNodes       map[string]*rollupNode.OpNode
	L2OutputSubmitter *l2os.L2OutputSubmitter
	BatchSubmitter    *bss.BatchSubmitter
	Mocknet           mocknet.Mocknet
}

func (sys *System) Close() {
	if sys.L2OutputSubmitter != nil {
		sys.L2OutputSubmitter.Stop()
	}
	if sys.BatchSubmitter != nil {
		sys.BatchSubmitter.Stop()
	}

	for _, node := range sys.RollupNodes {
		node.Close()
	}
	for _, node := range sys.Nodes {
		node.Close()
	}
	sys.Mocknet.Close()
}

func (cfg SystemConfig) Start() (*System, error) {
	sys := &System{
		cfg:         cfg,
		Nodes:       make(map[string]*node.Node),
		Backends:    make(map[string]*geth_eth.Ethereum),
		Clients:     make(map[string]*ethclient.Client),
		RollupNodes: make(map[string]*rollupNode.OpNode),
	}
	didErrAfterStart := false
	defer func() {
		if didErrAfterStart {
			for _, node := range sys.RollupNodes {
				node.Close()
			}
			for _, node := range sys.Nodes {
				node.Close()
			}
		}
	}()

	l1Genesis, err := genesis.BuildL1DeveloperGenesis(cfg.DeployConfig)
	if err != nil {
		return nil, err
	}

	for addr, amount := range cfg.Premine {
		if existing, ok := l1Genesis.Alloc[addr]; ok {
			l1Genesis.Alloc[addr] = core.GenesisAccount{
				Code:    existing.Code,
				Storage: existing.Storage,
				Balance: amount,
				Nonce:   existing.Nonce,
			}
		} else {
			l1Genesis.Alloc[addr] = core.GenesisAccount{
				Balance: amount,
				Nonce:   0,
			}
		}
	}

	l1Block := l1Genesis.ToBlock()
	l2Genesis, err := genesis.BuildL2DeveloperGenesis(cfg.DeployConfig, l1Block)
	if err != nil {
		return nil, err
	}

	makeRollupConfig := func() rollup.Config {
		return rollup.Config{
			Genesis: rollup.Genesis{
				L1: eth.BlockID{
					Hash:   l1Block.Hash(),
					Number: 0,
				},
				L2: eth.BlockID{
					Hash:   l2Genesis.ToBlock().Hash(),
					Number: 0,
				},
				L2Time:       uint64(cfg.DeployConfig.L1GenesisBlockTimestamp),
				SystemConfig: e2eutils.SystemConfigFromDeployConfig(cfg.DeployConfig),
			},
			BlockTime:              cfg.DeployConfig.L2BlockTime,
			MaxSequencerDrift:      cfg.DeployConfig.MaxSequencerDrift,
			SeqWindowSize:          cfg.DeployConfig.SequencerWindowSize,
			ChannelTimeout:         cfg.DeployConfig.ChannelTimeout,
			L1ChainID:              cfg.L1ChainIDBig(),
			L2ChainID:              cfg.L2ChainIDBig(),
			P2PSequencerAddress:    cfg.DeployConfig.P2PSequencerAddress,
			BatchInboxAddress:      cfg.DeployConfig.BatchInboxAddress,
			DepositContractAddress: predeploys.DevOptimismPortalAddr,
			L1SystemConfigAddress:  predeploys.DevSystemConfigAddr,
		}
	}
	defaultConfig := makeRollupConfig()
	sys.RollupConfig = &defaultConfig

	// Initialize nodes
	l1Node, l1Backend, err := initL1Geth(&cfg, l1Genesis)
	if err != nil {
		return nil, err
	}
	sys.Nodes["l1"] = l1Node
	sys.Backends["l1"] = l1Backend

	for name := range cfg.Nodes {
		node, backend, err := initL2Geth(name, big.NewInt(int64(cfg.DeployConfig.L2ChainID)), l2Genesis, cfg.JWTFilePath)
		if err != nil {
			return nil, err
		}
		sys.Nodes[name] = node
		sys.Backends[name] = backend
	}

	// Start
	err = l1Node.Start()
	if err != nil {
		didErrAfterStart = true
		return nil, err
	}
	err = l1Backend.StartMining(1)
	if err != nil {
		didErrAfterStart = true
		return nil, err
	}
	for name, node := range sys.Nodes {
		if name == "l1" {
			continue
		}
		err = node.Start()
		if err != nil {
			didErrAfterStart = true
			return nil, err
		}
	}

	// Configure connections to L1 and L2 for rollup nodes.
	// TODO: refactor testing to use in-process rpc connections instead of websockets.

	l1EndpointConfig := l1Node.WSEndpoint()
	useHTTP := os.Getenv("OP_E2E_USE_HTTP") == "true"
	if useHTTP {
		log.Info("using HTTP client")
		l1EndpointConfig = l1Node.HTTPEndpoint()
	}

	for name, rollupCfg := range cfg.Nodes {
		l2EndpointConfig := sys.Nodes[name].WSAuthEndpoint()
		if useHTTP {
			l2EndpointConfig = sys.Nodes[name].HTTPAuthEndpoint()
		}
		rollupCfg.L1 = &rollupNode.L1EndpointConfig{
			L1NodeAddr: l1EndpointConfig,
			L1TrustRPC: false,
		}
		rollupCfg.L2 = &rollupNode.L2EndpointConfig{
			L2EngineAddr:      l2EndpointConfig,
			L2EngineJWTSecret: cfg.JWTSecret,
		}
	}

	// Geth Clients
	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
	defer cancel()
	l1Srv, err := l1Node.RPCHandler()
	if err != nil {
		didErrAfterStart = true
		return nil, err
	}
	l1Client := ethclient.NewClient(rpc.DialInProc(l1Srv))
	sys.Clients["l1"] = l1Client
	for name, node := range sys.Nodes {
		client, err := ethclient.DialContext(ctx, node.WSEndpoint())
		if err != nil {
			didErrAfterStart = true
			return nil, err
		}
		sys.Clients[name] = client
	}

	_, err = waitForBlock(big.NewInt(2), l1Client, 6*time.Second*time.Duration(cfg.DeployConfig.L1BlockTime))
	if err != nil {
		return nil, fmt.Errorf("waiting for blocks: %w", err)
	}

	sys.Mocknet = mocknet.New()

	p2pNodes := make(map[string]*p2p.Prepared)
	if cfg.P2PTopology != nil {
		// create the peer if it doesn't exist yet.
		initHostMaybe := func(name string) (*p2p.Prepared, error) {
			if p, ok := p2pNodes[name]; ok {
				return p, nil
			}
			h, err := sys.Mocknet.GenPeer()
			if err != nil {
				return nil, fmt.Errorf("failed to init p2p host for node %s", name)
			}
			h.Network()
			_, ok := cfg.Nodes[name]
			if !ok {
				return nil, fmt.Errorf("node %s from p2p topology not found in actual nodes map", name)
			}
			// TODO we can enable discv5 in the testnodes to test discovery of new peers.
			// Would need to mock though, and the discv5 implementation does not provide nice mocks here.
			p := &p2p.Prepared{
				HostP2P:   h,
				LocalNode: nil,
				UDPv5:     nil,
			}
			p2pNodes[name] = p
			return p, nil
		}
		for k, vs := range cfg.P2PTopology {
			peerA, err := initHostMaybe(k)
			if err != nil {
				return nil, fmt.Errorf("failed to setup mocknet peer %s", k)
			}
			for _, v := range vs {
				v = strings.TrimPrefix(v, "~")
				peerB, err := initHostMaybe(v)
				if err != nil {
					return nil, fmt.Errorf("failed to setup mocknet peer %s (peer of %s)", v, k)
				}
				if _, err := sys.Mocknet.LinkPeers(peerA.HostP2P.ID(), peerB.HostP2P.ID()); err != nil {
					return nil, fmt.Errorf("failed to setup mocknet link between %s and %s", k, v)
				}
				// connect the peers after starting the full rollup node
			}
		}
	}

	// Don't log state snapshots in test output
	snapLog := log.New()
	snapLog.SetHandler(log.DiscardHandler())

	// Rollup nodes
	for name, nodeConfig := range cfg.Nodes {
		c := *nodeConfig // copy
		c.Rollup = makeRollupConfig()

		if p, ok := p2pNodes[name]; ok {
			c.P2P = p

			if c.Driver.SequencerEnabled {
				c.P2PSigner = &p2p.PreparedSigner{Signer: p2p.NewLocalSigner(cfg.Secrets.SequencerP2P)}
			}
		}

		node, err := rollupNode.New(context.Background(), &c, cfg.Loggers[name], snapLog, "", metrics.NewMetrics(""))
		if err != nil {
			didErrAfterStart = true
			return nil, err
		}
		err = node.Start(context.Background())
		if err != nil {
			didErrAfterStart = true
			return nil, err
		}
		sys.RollupNodes[name] = node
	}

	if cfg.P2PTopology != nil {
		// We only set up the connections after starting the actual nodes,
		// so GossipSub and other p2p protocols can be started before the connections go live.
		// This way protocol negotiation happens correctly.
		for k, vs := range cfg.P2PTopology {
			peerA := p2pNodes[k]
			for _, v := range vs {
				unconnected := strings.HasPrefix(v, "~")
				if unconnected {
					v = v[1:]
				}
				if !unconnected {
					peerB := p2pNodes[v]
					if _, err := sys.Mocknet.ConnectPeers(peerA.HostP2P.ID(), peerB.HostP2P.ID()); err != nil {
						return nil, fmt.Errorf("failed to setup mocknet connection between %s and %s", k, v)
					}
				}
			}
		}
	}

	// L2Output Submitter
	sys.L2OutputSubmitter, err = l2os.NewL2OutputSubmitter(l2os.Config{
		L1EthRpc:                  sys.Nodes["l1"].WSEndpoint(),
		RollupRpc:                 sys.RollupNodes["sequencer"].HTTPEndpoint(),
		L2OOAddress:               predeploys.DevL2OutputOracleAddr.String(),
		PollInterval:              50 * time.Millisecond,
		NumConfirmations:          1,
		ResubmissionTimeout:       3 * time.Second,
		SafeAbortNonceTooLowCount: 3,
		AllowNonFinalized:         cfg.NonFinalizedProposals,
		LogConfig: oplog.CLIConfig{
			Level:  "info",
			Format: "text",
		},
		PrivateKey: hexPriv(cfg.Secrets.Proposer),
	}, "", sys.cfg.Loggers["proposer"])
	if err != nil {
		return nil, fmt.Errorf("unable to setup l2 output submitter: %w", err)
	}

	if err := sys.L2OutputSubmitter.Start(); err != nil {
		return nil, fmt.Errorf("unable to start l2 output submitter: %w", err)
	}

	// Batch Submitter
	sys.BatchSubmitter, err = bss.NewBatchSubmitter(bss.Config{
		L1EthRpc:                  sys.Nodes["l1"].WSEndpoint(),
		L2EthRpc:                  sys.Nodes["sequencer"].WSEndpoint(),
		RollupRpc:                 sys.RollupNodes["sequencer"].HTTPEndpoint(),
		MinL1TxSize:               1,
		MaxL1TxSize:               120000,
		ChannelTimeout:            cfg.DeployConfig.ChannelTimeout,
		PollInterval:              50 * time.Millisecond,
		NumConfirmations:          1,
		ResubmissionTimeout:       5 * time.Second,
		SafeAbortNonceTooLowCount: 3,
		LogConfig: oplog.CLIConfig{
			Level:  "info",
			Format: "text",
		},
		PrivateKey:                 hexPriv(cfg.Secrets.Batcher),
		SequencerBatchInboxAddress: cfg.DeployConfig.BatchInboxAddress.String(),
	}, sys.cfg.Loggers["batcher"])
	if err != nil {
		return nil, fmt.Errorf("failed to setup batch submitter: %w", err)
	}

	if err := sys.BatchSubmitter.Start(); err != nil {
		return nil, fmt.Errorf("unable to start batch submitter: %w", err)
	}

	return sys, nil
}

func (cfg SystemConfig) L1ChainIDBig() *big.Int {
	return new(big.Int).SetUint64(cfg.DeployConfig.L1ChainID)
}

func (cfg SystemConfig) L2ChainIDBig() *big.Int {
	return new(big.Int).SetUint64(cfg.DeployConfig.L2ChainID)
}

func uint642big(in uint64) *hexutil.Big {
	b := new(big.Int).SetUint64(in)
	hu := hexutil.Big(*b)
	return &hu
}

func hexPriv(in *ecdsa.PrivateKey) string {
	b := e2eutils.EncodePrivKey(in)
	return hexutil.Encode(b)
}
