cli/cmd/evm.go

// Copyright (C) 2022-2025, Lux Industries Inc. All rights reserved.
// See the file LICENSE for licensing terms.

package cmd

import (
	"encoding/json"
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"strings"

	"github.com/luxfi/cli/pkg/route"
	"github.com/luxfi/constants"
	"github.com/spf13/cobra"
)

// evmBlockchainID is the chain this command deploys.
const evmBlockchainID = "2G8mK7VCZX1dV8iPjkkTDMpYGZDCNLLVdTJVLmMsG5ZV7zKVmB"

var (
	evmNetworkID   int
	evmDataDir     string
	evmPort        int
	evmChainConfig string
	evmSkipBuild   bool
	evmBackend     string // gevm, revm, cevm, auto
	evmGPU         bool   // enable GPU acceleration
)

var evmCmd = &cobra.Command{
	Use:   "evm",
	Short: "Manage EVM chain deployments",
	Long: `Deploy and manage EVM chains with existing state.

This command allows you to deploy a new EVM chain using an existing PebbleDB database,
enabling easy migration and state preservation across network deployments.`,
}

var evmDeployCmd = &cobra.Command{
	Use:   "deploy",
	Short: "Deploy EVM chain",
	Long: `Deploy a new EVM chain, optionally reusing an existing data directory.

Example:
  lux evm deploy                         # Uses default ~/.lux/evm/
  lux evm deploy --network-id 2          # Deploy on testnet
  lux evm deploy --data-dir ~/.lux/evm   # Specify data directory`,
	RunE: deployEVM,
}

func NewEVMCmd() *cobra.Command {
	evmCmd.AddCommand(evmDeployCmd)

	evmDeployCmd.Flags().IntVar(&evmNetworkID, "network-id", int(constants.MainnetID), "Network ID for the deployment (1=mainnet, 2=testnet, 3=devnet)")
	evmDeployCmd.Flags().StringVar(&evmDataDir, "data-dir", "", "Data directory for the node (default: ~/.lux/evm)")
	evmDeployCmd.Flags().IntVar(&evmPort, "port", 9630, "Port for the node RPC")
	evmDeployCmd.Flags().StringVar(&evmChainConfig, "chain-config", "", "Path to chain configuration JSON")
	evmDeployCmd.Flags().BoolVar(&evmSkipBuild, "skip-build", false, "Skip building the EVM plugin")
	evmDeployCmd.Flags().StringVar(&evmBackend, "backend", "gevm", "EVM backend: gevm (Go), revm (Rust), cevm (C++), auto")
	evmDeployCmd.Flags().BoolVar(&evmGPU, "gpu", false, "Enable GPU acceleration (Metal/CUDA)")

	return evmCmd
}

func deployEVM(cmd *cobra.Command, args []string) error {
	// Set default data directory if not provided - use ~/.lux/evm
	if evmDataDir == "" {
		evmDataDir = filepath.Join(os.Getenv("HOME"), ".lux", "evm")
	}

	// Check if data directory exists and has an existing database
	var existingDB string
	blockchainID := evmBlockchainID

	// Check for existing database in standard locations
	possibleDBPaths := []string{
		filepath.Join(evmDataDir, "chains", blockchainID, "db"),
		filepath.Join(evmDataDir, "db", blockchainID, "db"),
	}

	for _, dbPath := range possibleDBPaths {
		if _, err := os.Stat(dbPath); err == nil {
			existingDB = dbPath
			fmt.Printf("✅ Found existing PebbleDB at %s\n", existingDB)

			// Check database size
			cmd := exec.Command("du", "-sh", existingDB) //nolint:gosec // G204: Known command
			output, err := cmd.Output()
			if err == nil {
				fmt.Printf("   Database size: %s", output)
			}
			break
		}
	}

	fmt.Printf("\nDeploying EVM chain\n")
	fmt.Printf("   Network ID: %d\n", evmNetworkID)
	fmt.Printf("   Data Directory: %s\n", evmDataDir)
	fmt.Printf("   RPC Port: %d\n", evmPort)

	// Create directory structure
	dirs := []string{
		evmDataDir,
		filepath.Join(evmDataDir, "staking"),
		filepath.Join(evmDataDir, "plugins"),
		filepath.Join(evmDataDir, "logs"),
		filepath.Join(evmDataDir, "db"),
		filepath.Join(evmDataDir, "configs", "chains"),
	}

	for _, dir := range dirs {
		if err := os.MkdirAll(dir, 0o750); err != nil {
			return fmt.Errorf("failed to create directory %s: %w", dir, err)
		}
	}

	// Build EVM plugin if needed
	if !evmSkipBuild {
		// Compute build tags from --backend and --gpu flags
		var tags []string
		switch evmBackend {
		case "revm":
			tags = append(tags, "revm")
		case "cevm":
			tags = append(tags, "cevm")
		case "auto":
			tags = append(tags, "revm", "cevm") // link all, select at runtime
		}
		if evmGPU {
			tags = append(tags, "gpu")
		}

		tagStr := ""
		if len(tags) > 0 {
			tagStr = "-tags " + strings.Join(tags, ",")
		}

		fmt.Printf("\n  Building EVM plugin (backend=%s, gpu=%v)...\n", evmBackend, evmGPU)
		buildScript := fmt.Sprintf("cd %s && CGO_ENABLED=1 go build %s -o %s/plugins/evm ./plugin",
			filepath.Join(os.Getenv("HOME"), "work", "lux", "evm"),
			tagStr,
			evmDataDir)
		buildCmd := exec.Command("bash", "-c", buildScript)
		buildCmd.Stdout = os.Stdout
		buildCmd.Stderr = os.Stderr
		if err := buildCmd.Run(); err != nil {
			return fmt.Errorf("failed to build EVM: %w", err)
		}
	}

	// Copy EVM plugin from build location
	pluginSrc := "/home/z/work/lux/evm/build/mgj786NP7uDwBCcq6YwThhaN8FLyybkCa4zBWTQbNgmK6k9A6"
	// If build location doesn't exist, try lux-cli plugins directory
	if _, err := os.Stat(pluginSrc); os.IsNotExist(err) {
		pluginSrc = filepath.Join(os.Getenv("HOME"), ".lux-cli", "plugins", "mgj786NP7uDwBCcq6YwThhaN8FLyybkCa4zBWTQbNgmK6k9A6")
	}
	pluginDst := filepath.Join(evmDataDir, "plugins", "mgj786NP7uDwBCcq6YwThhaN8FLyybkCa4zBWTQbNgmK6k9A6")

	if _, err := os.Stat(pluginSrc); err == nil {
		copyCmd := exec.Command("cp", pluginSrc, pluginDst) //nolint:gosec // G204: Known command
		if err := copyCmd.Run(); err != nil {
			return fmt.Errorf("failed to copy EVM plugin: %w", err)
		}
		_ = os.Chmod(pluginDst, 0o755) //nolint:gosec // G302: Executable needs 0755
		fmt.Println("✅ EVM plugin installed")
	}

	// If existing database wasn't found in the data directory, we may still be able to use existing data
	// The database would already be in place if we're reusing an existing data directory
	if existingDB != "" {
		fmt.Printf("✅ Will reuse existing PebbleDB database\n")
		fmt.Printf("   Database path: %s\n", existingDB)
	}

	// Generate staking certificates
	fmt.Println("\n🔐 Generating staking certificates...")
	stakingDir := filepath.Join(evmDataDir, "staking")

	genCertCmd := exec.Command("openssl", "req", "-x509", "-newkey", "rsa:4096", //nolint:gosec // G204: Known openssl command
		"-keyout", filepath.Join(stakingDir, "staker.key"),
		"-out", filepath.Join(stakingDir, "staker.crt"),
		"-sha256", "-days", "365", "-nodes",
		"-subj", "/CN=LuxEVM")
	if err := genCertCmd.Run(); err != nil {
		return fmt.Errorf("failed to generate certificates: %w", err)
	}

	copyCmd := exec.Command("cp", //nolint:gosec // G204: Known command
		filepath.Join(stakingDir, "staker.key"),
		filepath.Join(stakingDir, "signer.key"))
	_ = copyCmd.Run()

	// Create chain configuration if provided
	if evmChainConfig != "" {
		chainConfigDst := filepath.Join(evmDataDir, "configs", "chains",
			evmBlockchainID, "config.json")

		_ = os.MkdirAll(filepath.Dir(chainConfigDst), 0o750)
		copyCmd := exec.Command("cp", evmChainConfig, chainConfigDst) //nolint:gosec // G204: Known command
		if err := copyCmd.Run(); err != nil {
			fmt.Printf("Warning: Could not copy chain config: %v\n", err)
		}
	}

	// Create node configuration
	nodeConfig := map[string]interface{}{
		"network-id":               evmNetworkID,
		"data-dir":                 evmDataDir,
		"db-dir":                   filepath.Join(evmDataDir, "db"),
		"log-dir":                  filepath.Join(evmDataDir, "logs"),
		"plugin-dir":               filepath.Join(evmDataDir, "plugins"),
		"chain-config-dir":         filepath.Join(evmDataDir, "configs", "chains"),
		"log-level":                "info",
		"http-host":                "0.0.0.0",
		"http-port":                evmPort,
		"staking-enabled":          false,
		"sybil-protection-enabled": false,
		"consensus-sample-size":    1,
		"consensus-quorum-size":    1,
		"api-admin-enabled":        true,
		"api-metrics-enabled":      true,
		"api-health-enabled":       true,
		"api-info-enabled":         true,
		"index-enabled":            true,
		"db-type":                  "badgerdb",
		"http-allowed-origins":     "*",
		"http-allowed-hosts":       "*",
		"chain-data-dir":           filepath.Join(evmDataDir, "chaindata"),
	}

	configPath := filepath.Join(evmDataDir, "config.json")
	configFile, err := os.Create(configPath) //nolint:gosec // G304: Creating config in app's data directory
	if err != nil {
		return fmt.Errorf("failed to create config file: %w", err)
	}
	defer func() { _ = configFile.Close() }()

	encoder := json.NewEncoder(configFile)
	encoder.SetIndent("", "  ")
	if err := encoder.Encode(nodeConfig); err != nil {
		return fmt.Errorf("failed to write config: %w", err)
	}

	rpc := route.Chain(fmt.Sprintf("http://localhost:%d", evmPort), evmBlockchainID) + "/rpc"

	// Create launch script
	launchScript := filepath.Join(evmDataDir, "launch.sh")
	script := fmt.Sprintf(`#!/bin/bash
echo "Starting EVM chain node..."
echo "   Data directory: %s"
echo "   RPC endpoint: %s"
echo ""

exec /home/z/work/lux/node/build/luxd --config-file=%s
`, evmDataDir, rpc, configPath)

	if err := os.WriteFile(launchScript, []byte(script), 0o755); err != nil { //nolint:gosec // G306: Launch script needs to be executable
		return fmt.Errorf("failed to create launch script: %w", err)
	}

	fmt.Println("\n✅ EVM deployment prepared successfully!")
	fmt.Println("\n📋 Deployment Summary:")
	fmt.Printf("   Data Directory: %s\n", evmDataDir)
	fmt.Printf("   Config File: %s\n", configPath)
	fmt.Printf("   Launch Script: %s\n", launchScript)

	if existingDB != "" {
		fmt.Printf("   Using Existing DB: %s (9.3GB with 1M+ blocks)\n", existingDB)
		fmt.Println("   State: All accounts, balances, and contracts preserved")
	}

	fmt.Println("\nTo start the EVM chain:")
	fmt.Printf("   %s\n", launchScript)

	fmt.Println("\n📡 Once running, access via:")
	fmt.Printf("   RPC: %s\n", rpc)

	return nil
}

// Additional helper commands can be added here for:
// - lux evm status - Check EVM status
// - lux evm stop - Stop EVM node
// - lux evm logs - View EVM logs
// - lux evm info - Get blockchain info