/*
	This file is part of go-ethereum

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

	go-ethereum 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 General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with go-ethereum.  If not, see <http://www.gnu.org/licenses/>.
*/
/**
 * @authors
 * 	Jeffrey Wilcke <i@jev.io>
 */
package main

import (
	"crypto/ecdsa"
	"flag"
	"fmt"
	"log"
	"os"
	"os/user"
	"path"
	"path/filepath"
	"runtime"

	"bitbucket.org/kardianos/osext"
	"github.com/ethereum/go-ethereum/crypto"
	"github.com/ethereum/go-ethereum/logger"
	"github.com/ethereum/go-ethereum/p2p/nat"
	"github.com/ethereum/go-ethereum/vm"
)

var (
	Identifier      string
	KeyRing         string
	KeyStore        string
	StartRpc        bool
	StartWebSockets bool
	RpcPort         int
	WsPort          int
	OutboundPort    string
	ShowGenesis     bool
	AddPeer         string
	MaxPeer         int
	GenAddr         bool
	BootNodes       string
	NodeKey         *ecdsa.PrivateKey
	NAT             nat.Interface
	SecretFile      string
	ExportDir       string
	NonInteractive  bool
	Datadir         string
	LogFile         string
	ConfigFile      string
	DebugFile       string
	LogLevel        int
	VmType          int
	MinerThreads    int
)

// flags specific to gui client
var AssetPath string

//TODO: If we re-use the one defined in cmd.go the binary osx image crashes. If somebody finds out why we can dry this up.
func defaultAssetPath() string {
	var assetPath string
	// If the current working directory is the go-ethereum dir
	// assume a debug build and use the source directory as
	// asset directory.
	pwd, _ := os.Getwd()
	if pwd == path.Join(os.Getenv("GOPATH"), "src", "github.com", "ethereum", "go-ethereum", "cmd", "mist") {
		assetPath = path.Join(pwd, "assets")
	} else {
		switch runtime.GOOS {
		case "darwin":
			// Get Binary Directory
			exedir, _ := osext.ExecutableFolder()
			assetPath = filepath.Join(exedir, "../Resources")
		case "linux":
			assetPath = "/usr/share/mist"
		case "windows":
			assetPath = "./assets"
		default:
			assetPath = "."
		}
	}
	return assetPath
}
func defaultDataDir() string {
	usr, _ := user.Current()
	return path.Join(usr.HomeDir, ".ethereum")
}

var defaultConfigFile = path.Join(defaultDataDir(), "conf.ini")

func Init() {
	// TODO: move common flag processing to cmd/utils
	flag.Usage = func() {
		fmt.Fprintf(os.Stderr, "%s [options] [filename]:\noptions precedence: default < config file < environment variables < command line\n", os.Args[0])
		flag.PrintDefaults()
	}

	flag.IntVar(&VmType, "vm", 0, "Virtual Machine type: 0-1: standard, debug")
	flag.StringVar(&Identifier, "id", "", "Custom client identifier")
	flag.StringVar(&KeyRing, "keyring", "", "identifier for keyring to use")
	flag.StringVar(&KeyStore, "keystore", "db", "system to store keyrings: db|file (db)")
	flag.IntVar(&RpcPort, "rpcport", 8545, "port to start json-rpc server on")
	flag.IntVar(&WsPort, "wsport", 40404, "port to start websocket rpc server on")
	flag.BoolVar(&StartRpc, "rpc", true, "start rpc server")
	flag.BoolVar(&StartWebSockets, "ws", false, "start websocket server")
	flag.BoolVar(&NonInteractive, "y", false, "non-interactive mode (say yes to confirmations)")
	flag.BoolVar(&GenAddr, "genaddr", false, "create a new priv/pub key")
	flag.StringVar(&SecretFile, "import", "", "imports the file given (hex or mnemonic formats)")
	flag.StringVar(&ExportDir, "export", "", "exports the session keyring to files in the directory given")
	flag.StringVar(&LogFile, "logfile", "", "log file (defaults to standard output)")
	flag.StringVar(&Datadir, "datadir", defaultDataDir(), "specifies the datadir to use")
	flag.StringVar(&ConfigFile, "conf", defaultConfigFile, "config file")
	flag.StringVar(&DebugFile, "debug", "", "debug file (no debugging if not set)")
	flag.IntVar(&LogLevel, "loglevel", int(logger.InfoLevel), "loglevel: 0-5: silent,error,warn,info,debug,debug detail)")

	flag.StringVar(&AssetPath, "asset_path", defaultAssetPath(), "absolute path to GUI assets directory")

	// Network stuff
	var (
		nodeKeyFile = flag.String("nodekey", "", "network private key file")
		nodeKeyHex  = flag.String("nodekeyhex", "", "network private key (for testing)")
		natstr      = flag.String("nat", "any", "port mapping mechanism (any|none|upnp|pmp|extip:<IP>)")
	)
	flag.StringVar(&OutboundPort, "port", "30303", "listening port")
	flag.StringVar(&BootNodes, "bootnodes", "", "space-separated node URLs for discovery bootstrap")
	flag.IntVar(&MaxPeer, "maxpeer", 30, "maximum desired peers")

	flag.IntVar(&MinerThreads, "minerthreads", runtime.NumCPU(), "number of miner threads")

	flag.Parse()

	var err error
	if NAT, err = nat.Parse(*natstr); err != nil {
		log.Fatalf("-nat: %v", err)
	}
	switch {
	case *nodeKeyFile != "" && *nodeKeyHex != "":
		log.Fatal("Options -nodekey and -nodekeyhex are mutually exclusive")
	case *nodeKeyFile != "":
		if NodeKey, err = crypto.LoadECDSA(*nodeKeyFile); err != nil {
			log.Fatalf("-nodekey: %v", err)
		}
	case *nodeKeyHex != "":
		if NodeKey, err = crypto.HexToECDSA(*nodeKeyHex); err != nil {
			log.Fatalf("-nodekeyhex: %v", err)
		}
	}

	if VmType >= int(vm.MaxVmTy) {
		log.Fatal("Invalid VM type ", VmType)
	}
}