package main

import (
	"encoding/json"
	"errors"
	"fmt"
	"math/big"
	"strconv"
	"time"

	"github.com/ethereum/go-ethereum/cmd/utils"
	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/common/compiler"
	"github.com/ethereum/go-ethereum/common/natspec"
	"github.com/ethereum/go-ethereum/common/resolver"
	"github.com/ethereum/go-ethereum/core/state"
	"github.com/ethereum/go-ethereum/core/types"
	"github.com/ethereum/go-ethereum/core/vm"
	"github.com/ethereum/go-ethereum/crypto"
	"github.com/ethereum/go-ethereum/logger/glog"
	"github.com/ethereum/go-ethereum/rlp"
	"github.com/ethereum/go-ethereum/rpc"
	"github.com/ethereum/go-ethereum/xeth"
	"github.com/robertkrimen/otto"
	"gopkg.in/fatih/set.v0"
)

/*
node admin bindings
*/

func (js *jsre) adminBindings() {
	ethO, _ := js.re.Get("eth")
	eth := ethO.Object()
	eth.Set("pendingTransactions", js.pendingTransactions)
	eth.Set("resend", js.resend)

	js.re.Set("admin", struct{}{})
	t, _ := js.re.Get("admin")
	admin := t.Object()
	admin.Set("addPeer", js.addPeer)
	admin.Set("startRPC", js.startRPC)
	admin.Set("stopRPC", js.stopRPC)
	admin.Set("nodeInfo", js.nodeInfo)
	admin.Set("peers", js.peers)
	admin.Set("newAccount", js.newAccount)
	admin.Set("unlock", js.unlock)
	admin.Set("import", js.importChain)
	admin.Set("export", js.exportChain)
	admin.Set("verbosity", js.verbosity)
	admin.Set("progress", js.downloadProgress)
	admin.Set("setSolc", js.setSolc)

	admin.Set("contractInfo", struct{}{})
	t, _ = admin.Get("contractInfo")
	cinfo := t.Object()
	// newRegistry officially not documented temporary option
	cinfo.Set("start", js.startNatSpec)
	cinfo.Set("stop", js.stopNatSpec)
	cinfo.Set("newRegistry", js.newRegistry)
	cinfo.Set("get", js.getContractInfo)
	cinfo.Set("register", js.register)
	cinfo.Set("registerUrl", js.registerUrl)
	// cinfo.Set("verify", js.verify)

	admin.Set("miner", struct{}{})
	t, _ = admin.Get("miner")
	miner := t.Object()
	miner.Set("start", js.startMining)
	miner.Set("stop", js.stopMining)
	miner.Set("hashrate", js.hashrate)
	miner.Set("setExtra", js.setExtra)
	miner.Set("setGasPrice", js.setGasPrice)

	admin.Set("debug", struct{}{})
	t, _ = admin.Get("debug")
	debug := t.Object()
	js.re.Set("sleep", js.sleep)
	debug.Set("backtrace", js.backtrace)
	debug.Set("printBlock", js.printBlock)
	debug.Set("dumpBlock", js.dumpBlock)
	debug.Set("getBlockRlp", js.getBlockRlp)
	debug.Set("setHead", js.setHead)
	debug.Set("processBlock", js.debugBlock)
	// undocumented temporary
	debug.Set("waitForBlocks", js.waitForBlocks)
}

// generic helper to getBlock by Number/Height or Hex depending on autodetected input
// if argument is missing the current block is returned
// if block is not found or there is problem with decoding
// the appropriate value is returned and block is guaranteed to be nil
func (js *jsre) getBlock(call otto.FunctionCall) (*types.Block, error) {
	var block *types.Block
	if len(call.ArgumentList) > 0 {
		if call.Argument(0).IsNumber() {
			num, _ := call.Argument(0).ToInteger()
			block = js.ethereum.ChainManager().GetBlockByNumber(uint64(num))
		} else if call.Argument(0).IsString() {
			hash, _ := call.Argument(0).ToString()
			block = js.ethereum.ChainManager().GetBlock(common.HexToHash(hash))
		} else {
			return nil, errors.New("invalid argument for dump. Either hex string or number")
		}
	} else {
		block = js.ethereum.ChainManager().CurrentBlock()
	}

	if block == nil {
		return nil, errors.New("block not found")
	}
	return block, nil
}

func (js *jsre) pendingTransactions(call otto.FunctionCall) otto.Value {
	txs := js.ethereum.TxPool().GetTransactions()

	// grab the accounts from the account manager. This will help with determening which
	// transactions should be returned.
	accounts, err := js.ethereum.AccountManager().Accounts()
	if err != nil {
		fmt.Println(err)
		return otto.UndefinedValue()
	}

	// Add the accouns to a new set
	accountSet := set.New()
	for _, account := range accounts {
		accountSet.Add(common.BytesToAddress(account.Address))
	}

	//ltxs := make([]*tx, len(txs))
	var ltxs []*tx
	for _, tx := range txs {
		// no need to check err
		if from, _ := tx.From(); accountSet.Has(from) {
			ltxs = append(ltxs, newTx(tx))
		}
	}

	return js.re.ToVal(ltxs)
}

func (js *jsre) resend(call otto.FunctionCall) otto.Value {
	if len(call.ArgumentList) == 0 {
		fmt.Println("first argument must be a transaction")
		return otto.FalseValue()
	}

	v, err := call.Argument(0).Export()
	if err != nil {
		fmt.Println(err)
		return otto.FalseValue()
	}

	if tx, ok := v.(*tx); ok {
		gl, gp := tx.GasLimit, tx.GasPrice
		if len(call.ArgumentList) > 1 {
			gp = call.Argument(1).String()
		}
		if len(call.ArgumentList) > 2 {
			gl = call.Argument(2).String()
		}

		ret, err := js.xeth.Transact(tx.From, tx.To, tx.Nonce, tx.Value, gl, gp, tx.Data)
		if err != nil {
			fmt.Println(err)
			return otto.FalseValue()
		}
		js.ethereum.TxPool().RemoveTransactions(types.Transactions{tx.tx})

		return js.re.ToVal(ret)
	}

	fmt.Println("first argument must be a transaction")
	return otto.FalseValue()
}

func (js *jsre) debugBlock(call otto.FunctionCall) otto.Value {
	block, err := js.getBlock(call)
	if err != nil {
		fmt.Println(err)
		return otto.UndefinedValue()
	}

	old := vm.Debug
	vm.Debug = true
	_, err = js.ethereum.BlockProcessor().RetryProcess(block)
	if err != nil {
		glog.Infoln(err)
	}
	vm.Debug = old

	return otto.UndefinedValue()
}

func (js *jsre) setHead(call otto.FunctionCall) otto.Value {
	block, err := js.getBlock(call)
	if err != nil {
		fmt.Println(err)
		return otto.UndefinedValue()
	}

	js.ethereum.ChainManager().SetHead(block)
	return otto.UndefinedValue()
}

func (js *jsre) downloadProgress(call otto.FunctionCall) otto.Value {
	current, max := js.ethereum.Downloader().Stats()

	return js.re.ToVal(fmt.Sprintf("%d/%d", current, max))
}

func (js *jsre) getBlockRlp(call otto.FunctionCall) otto.Value {
	block, err := js.getBlock(call)
	if err != nil {
		fmt.Println(err)
		return otto.UndefinedValue()
	}
	encoded, _ := rlp.EncodeToBytes(block)
	return js.re.ToVal(fmt.Sprintf("%x", encoded))
}

func (js *jsre) setExtra(call otto.FunctionCall) otto.Value {
	extra, err := call.Argument(0).ToString()
	if err != nil {
		fmt.Println(err)
		return otto.UndefinedValue()
	}

	if len(extra) > 1024 {
		fmt.Println("error: cannot exceed 1024 bytes")
		return otto.UndefinedValue()
	}

	js.ethereum.Miner().SetExtra([]byte(extra))
	return otto.UndefinedValue()
}

func (js *jsre) setGasPrice(call otto.FunctionCall) otto.Value {
	gasPrice, err := call.Argument(0).ToString()
	if err != nil {
		fmt.Println(err)
		return otto.UndefinedValue()
	}

	js.ethereum.Miner().SetGasPrice(common.String2Big(gasPrice))
	return otto.UndefinedValue()
}

func (js *jsre) hashrate(otto.FunctionCall) otto.Value {
	return js.re.ToVal(js.ethereum.Miner().HashRate())
}

func (js *jsre) backtrace(call otto.FunctionCall) otto.Value {
	tracestr, err := call.Argument(0).ToString()
	if err != nil {
		fmt.Println(err)
		return otto.UndefinedValue()
	}
	glog.GetTraceLocation().Set(tracestr)

	return otto.UndefinedValue()
}

func (js *jsre) verbosity(call otto.FunctionCall) otto.Value {
	v, err := call.Argument(0).ToInteger()
	if err != nil {
		fmt.Println(err)
		return otto.UndefinedValue()
	}

	glog.SetV(int(v))
	return otto.UndefinedValue()
}

func (js *jsre) startMining(call otto.FunctionCall) otto.Value {
	threads, err := call.Argument(0).ToInteger()
	if err != nil {
		fmt.Println(err)
		return otto.FalseValue()
	}

	err = js.ethereum.StartMining(int(threads))
	if err != nil {
		fmt.Println(err)
		return otto.FalseValue()
	}

	return otto.TrueValue()
}

func (js *jsre) stopMining(call otto.FunctionCall) otto.Value {
	js.ethereum.StopMining()
	return otto.TrueValue()
}

func (js *jsre) startRPC(call otto.FunctionCall) otto.Value {
	addr, err := call.Argument(0).ToString()
	if err != nil {
		fmt.Println(err)
		return otto.FalseValue()
	}

	port, err := call.Argument(1).ToInteger()
	if err != nil {
		fmt.Println(err)
		return otto.FalseValue()
	}

	corsDomain := js.corsDomain
	if len(call.ArgumentList) > 2 {
		corsDomain, err = call.Argument(2).ToString()
		if err != nil {
			fmt.Println(err)
			return otto.FalseValue()
		}
	}

	config := rpc.RpcConfig{
		ListenAddress: addr,
		ListenPort:    uint(port),
		CorsDomain:    corsDomain,
	}

	xeth := xeth.New(js.ethereum, nil)
	err = rpc.Start(xeth, config)
	if err != nil {
		fmt.Println(err)
		return otto.FalseValue()
	}

	return otto.TrueValue()
}

func (js *jsre) stopRPC(call otto.FunctionCall) otto.Value {
	if rpc.Stop() == nil {
		return otto.TrueValue()
	}
	return otto.FalseValue()
}

func (js *jsre) addPeer(call otto.FunctionCall) otto.Value {
	nodeURL, err := call.Argument(0).ToString()
	if err != nil {
		fmt.Println(err)
		return otto.FalseValue()
	}
	err = js.ethereum.AddPeer(nodeURL)
	if err != nil {
		fmt.Println(err)
		return otto.FalseValue()
	}
	return otto.TrueValue()
}

func (js *jsre) unlock(call otto.FunctionCall) otto.Value {
	addr, err := call.Argument(0).ToString()
	if err != nil {
		fmt.Println(err)
		return otto.FalseValue()
	}
	seconds, err := call.Argument(2).ToInteger()
	if err != nil {
		fmt.Println(err)
		return otto.FalseValue()
	}
	arg := call.Argument(1)
	var passphrase string
	if arg.IsUndefined() {
		fmt.Println("Please enter a passphrase now.")
		passphrase, err = readPassword("Passphrase: ", true)
		if err != nil {
			fmt.Println(err)
			return otto.FalseValue()
		}
	} else {
		passphrase, err = arg.ToString()
		if err != nil {
			fmt.Println(err)
			return otto.FalseValue()
		}
	}
	am := js.ethereum.AccountManager()
	err = am.TimedUnlock(common.FromHex(addr), passphrase, time.Duration(seconds)*time.Second)
	if err != nil {
		fmt.Printf("Unlock account failed '%v'\n", err)
		return otto.FalseValue()
	}
	return otto.TrueValue()
}

func (js *jsre) newAccount(call otto.FunctionCall) otto.Value {
	arg := call.Argument(0)
	var passphrase string
	if arg.IsUndefined() {
		fmt.Println("The new account will be encrypted with a passphrase.")
		fmt.Println("Please enter a passphrase now.")
		auth, err := readPassword("Passphrase: ", true)
		if err != nil {
			fmt.Println(err)
			return otto.FalseValue()
		}
		confirm, err := readPassword("Repeat Passphrase: ", false)
		if err != nil {
			fmt.Println(err)
			return otto.FalseValue()
		}
		if auth != confirm {
			fmt.Println("Passphrases did not match.")
			return otto.FalseValue()
		}
		passphrase = auth
	} else {
		var err error
		passphrase, err = arg.ToString()
		if err != nil {
			fmt.Println(err)
			return otto.FalseValue()
		}
	}
	acct, err := js.ethereum.AccountManager().NewAccount(passphrase)
	if err != nil {
		fmt.Printf("Could not create the account: %v", err)
		return otto.UndefinedValue()
	}
	return js.re.ToVal(common.ToHex(acct.Address))
}

func (js *jsre) nodeInfo(call otto.FunctionCall) otto.Value {
	return js.re.ToVal(js.ethereum.NodeInfo())
}

func (js *jsre) peers(call otto.FunctionCall) otto.Value {
	return js.re.ToVal(js.ethereum.PeersInfo())
}

func (js *jsre) importChain(call otto.FunctionCall) otto.Value {
	if len(call.ArgumentList) == 0 {
		fmt.Println("require file name. admin.importChain(filename)")
		return otto.FalseValue()
	}
	fn, err := call.Argument(0).ToString()
	if err != nil {
		fmt.Println(err)
		return otto.FalseValue()
	}
	if err := utils.ImportChain(js.ethereum.ChainManager(), fn); err != nil {
		fmt.Println("Import error: ", err)
		return otto.FalseValue()
	}
	return otto.TrueValue()
}

func (js *jsre) exportChain(call otto.FunctionCall) otto.Value {
	if len(call.ArgumentList) == 0 {
		fmt.Println("require file name: admin.exportChain(filename)")
		return otto.FalseValue()
	}

	fn, err := call.Argument(0).ToString()
	if err != nil {
		fmt.Println(err)
		return otto.FalseValue()
	}
	if err := utils.ExportChain(js.ethereum.ChainManager(), fn); err != nil {
		fmt.Println(err)
		return otto.FalseValue()
	}
	return otto.TrueValue()
}

func (js *jsre) printBlock(call otto.FunctionCall) otto.Value {
	block, err := js.getBlock(call)
	if err != nil {
		fmt.Println(err)
		return otto.UndefinedValue()
	}

	fmt.Println(block)

	return otto.UndefinedValue()
}

func (js *jsre) dumpBlock(call otto.FunctionCall) otto.Value {
	block, err := js.getBlock(call)
	if err != nil {
		fmt.Println(err)
		return otto.UndefinedValue()
	}

	statedb := state.New(block.Root(), js.ethereum.StateDb())
	dump := statedb.RawDump()
	return js.re.ToVal(dump)
}

func (js *jsre) waitForBlocks(call otto.FunctionCall) otto.Value {
	if len(call.ArgumentList) > 2 {
		fmt.Println("requires 0, 1 or 2 arguments: admin.debug.waitForBlock(minHeight, timeout)")
		return otto.FalseValue()
	}
	var n, timeout int64
	var timer <-chan time.Time
	var height *big.Int
	var err error
	args := len(call.ArgumentList)
	if args == 2 {
		timeout, err = call.Argument(1).ToInteger()
		if err != nil {
			fmt.Println(err)
			return otto.UndefinedValue()
		}
		timer = time.NewTimer(time.Duration(timeout) * time.Second).C
	}
	if args >= 1 {
		n, err = call.Argument(0).ToInteger()
		if err != nil {
			fmt.Println(err)
			return otto.UndefinedValue()
		}
		height = big.NewInt(n)
	}

	if args == 0 {
		height = js.xeth.CurrentBlock().Number()
		height.Add(height, common.Big1)
	}

	wait := js.wait
	js.wait <- height
	select {
	case <-timer:
		// if times out make sure the xeth loop does not block
		go func() {
			select {
			case wait <- nil:
			case <-wait:
			}
		}()
		return otto.UndefinedValue()
	case height = <-wait:
	}
	return js.re.ToVal(height.Uint64())
}

func (js *jsre) sleep(call otto.FunctionCall) otto.Value {
	sec, err := call.Argument(0).ToInteger()
	if err != nil {
		fmt.Println(err)
		return otto.FalseValue()
	}
	time.Sleep(time.Duration(sec) * time.Second)
	return otto.UndefinedValue()
}

func (js *jsre) setSolc(call otto.FunctionCall) otto.Value {
	if len(call.ArgumentList) != 1 {
		fmt.Println("needs 1 argument: admin.contractInfo.setSolc(solcPath)")
		return otto.FalseValue()
	}
	solcPath, err := call.Argument(0).ToString()
	if err != nil {
		return otto.FalseValue()
	}
	solc, err := js.xeth.SetSolc(solcPath)
	if err != nil {
		fmt.Println(err)
		return otto.FalseValue()
	}
	fmt.Println(solc.Info())
	return otto.TrueValue()
}

func (js *jsre) register(call otto.FunctionCall) otto.Value {
	if len(call.ArgumentList) != 4 {
		fmt.Println("requires 4 arguments: admin.contractInfo.register(fromaddress, contractaddress, contract, filename)")
		return otto.UndefinedValue()
	}
	sender, err := call.Argument(0).ToString()
	if err != nil {
		fmt.Println(err)
		return otto.UndefinedValue()
	}

	address, err := call.Argument(1).ToString()
	if err != nil {
		fmt.Println(err)
		return otto.UndefinedValue()
	}

	raw, err := call.Argument(2).Export()
	if err != nil {
		fmt.Println(err)
		return otto.UndefinedValue()
	}
	jsonraw, err := json.Marshal(raw)
	if err != nil {
		fmt.Println(err)
		return otto.UndefinedValue()
	}
	var contract compiler.Contract
	err = json.Unmarshal(jsonraw, &contract)
	if err != nil {
		fmt.Println(err)
		return otto.UndefinedValue()
	}

	filename, err := call.Argument(3).ToString()
	if err != nil {
		fmt.Println(err)
		return otto.UndefinedValue()
	}

	contenthash, err := compiler.ExtractInfo(&contract, filename)
	if err != nil {
		fmt.Println(err)
		return otto.UndefinedValue()
	}
	// sender and contract address are passed as hex strings
	codeb := js.xeth.CodeAtBytes(address)
	codehash := common.BytesToHash(crypto.Sha3(codeb))

	if err != nil {
		fmt.Println(err)
		return otto.UndefinedValue()
	}

	registry := resolver.New(js.xeth)

	_, err = registry.RegisterContentHash(common.HexToAddress(sender), codehash, contenthash)
	if err != nil {
		fmt.Println(err)
		return otto.UndefinedValue()
	}

	return js.re.ToVal(contenthash.Hex())

}

func (js *jsre) registerUrl(call otto.FunctionCall) otto.Value {
	if len(call.ArgumentList) != 3 {
		fmt.Println("requires 3 arguments: admin.contractInfo.register(fromaddress, contenthash, filename)")
		return otto.FalseValue()
	}
	sender, err := call.Argument(0).ToString()
	if err != nil {
		fmt.Println(err)
		return otto.FalseValue()
	}

	contenthash, err := call.Argument(1).ToString()
	if err != nil {
		fmt.Println(err)
		return otto.FalseValue()
	}

	url, err := call.Argument(2).ToString()
	if err != nil {
		fmt.Println(err)
		return otto.FalseValue()
	}

	registry := resolver.New(js.xeth)

	_, err = registry.RegisterUrl(common.HexToAddress(sender), common.HexToHash(contenthash), url)
	if err != nil {
		fmt.Println(err)
		return otto.FalseValue()
	}

	return otto.TrueValue()
}

func (js *jsre) getContractInfo(call otto.FunctionCall) otto.Value {
	if len(call.ArgumentList) != 1 {
		fmt.Println("requires 1 argument: admin.contractInfo.register(contractaddress)")
		return otto.FalseValue()
	}
	addr, err := call.Argument(0).ToString()
	if err != nil {
		fmt.Println(err)
		return otto.FalseValue()
	}

	infoDoc, err := natspec.FetchDocsForContract(addr, js.xeth, ds)
	if err != nil {
		fmt.Println(err)
		return otto.UndefinedValue()
	}
	var info compiler.ContractInfo
	err = json.Unmarshal(infoDoc, &info)
	if err != nil {
		fmt.Println(err)
		return otto.UndefinedValue()
	}
	return js.re.ToVal(info)
}

func (js *jsre) startNatSpec(call otto.FunctionCall) otto.Value {
	js.ethereum.NatSpec = true
	return otto.TrueValue()
}

func (js *jsre) stopNatSpec(call otto.FunctionCall) otto.Value {
	js.ethereum.NatSpec = false
	return otto.TrueValue()
}

func (js *jsre) newRegistry(call otto.FunctionCall) otto.Value {

	if len(call.ArgumentList) != 1 {
		fmt.Println("requires 1 argument: admin.contractInfo.newRegistry(adminaddress)")
		return otto.FalseValue()
	}
	addr, err := call.Argument(0).ToString()
	if err != nil {
		fmt.Println(err)
		return otto.FalseValue()
	}

	registry := resolver.New(js.xeth)
	err = registry.CreateContracts(common.HexToAddress(addr))
	if err != nil {
		fmt.Println(err)
		return otto.FalseValue()
	}

	return otto.TrueValue()
}

// internal transaction type which will allow us to resend transactions  using `eth.resend`
type tx struct {
	tx *types.Transaction

	To       string
	From     string
	Nonce    string
	Value    string
	Data     string
	GasLimit string
	GasPrice string
}

func newTx(t *types.Transaction) *tx {
	from, _ := t.From()
	var to string
	if t := t.To(); t != nil {
		to = t.Hex()
	}

	return &tx{
		tx:       t,
		To:       to,
		From:     from.Hex(),
		Value:    t.Amount.String(),
		Nonce:    strconv.Itoa(int(t.Nonce())),
		Data:     "0x" + common.Bytes2Hex(t.Data()),
		GasLimit: t.GasLimit.String(),
		GasPrice: t.GasPrice().String(),
	}
}