/*
	This file is part of cpp-ethereum.
	cpp-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.
	cpp-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 cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
*/
/** @file ClientModel.cpp
 * @author Yann yann@ethdev.com
 * @author Arkadiy Paronyan arkadiy@ethdev.com
 * @date 2015
 * Ethereum IDE client.
 */

// Make sure boost/asio.hpp is included before windows.h.
#include <boost/asio.hpp>

#include "ClientModel.h"
#include <QtConcurrent/QtConcurrent>
#include <QDebug>
#include <QQmlContext>
#include <QQmlApplicationEngine>
#include <QStandardPaths>
#include <jsonrpccpp/server.h>
#include <libethcore/CommonJS.h>
#include <libethereum/Transaction.h>
#include "DebuggingStateWrapper.h"
#include "Exceptions.h"
#include "QContractDefinition.h"
#include "QVariableDeclaration.h"
#include "QVariableDefinition.h"
#include "ContractCallDataEncoder.h"
#include "CodeModel.h"
#include "QEther.h"
#include "Web3Server.h"
#include "MixClient.h"

using namespace dev;
using namespace dev::eth;
using namespace std;

namespace dev
{
namespace mix
{

class RpcConnector: public jsonrpc::AbstractServerConnector
{
public:
	virtual bool StartListening() override { return true; }
	virtual bool StopListening() override { return true; }
	virtual bool SendResponse(string const& _response, void*) override
	{
		m_response = QString::fromStdString(_response);
		return true;
	}
	QString response() const { return m_response; }

private:
	QString m_response;
};


ClientModel::ClientModel():
	m_running(false), m_rpcConnector(new RpcConnector())
{
	qRegisterMetaType<QBigInt*>("QBigInt*");
	qRegisterMetaType<QVariableDefinition*>("QVariableDefinition*");
	qRegisterMetaType<QList<QVariableDefinition*>>("QList<QVariableDefinition*>");
	qRegisterMetaType<QList<QVariableDeclaration*>>("QList<QVariableDeclaration*>");
	qRegisterMetaType<QVariableDeclaration*>("QVariableDeclaration*");
	qRegisterMetaType<QSolidityType*>("QSolidityType*");
	qRegisterMetaType<QMachineState*>("QMachineState");
	qRegisterMetaType<QInstruction*>("QInstruction");
	qRegisterMetaType<QCode*>("QCode");
	qRegisterMetaType<QCallData*>("QCallData");
	qRegisterMetaType<RecordLogEntry*>("RecordLogEntry*");

	connect(this, &ClientModel::runComplete, this, &ClientModel::showDebugger, Qt::QueuedConnection);
	m_client.reset(new MixClient(QStandardPaths::writableLocation(QStandardPaths::TempLocation).toStdString()));

	m_web3Server.reset(new Web3Server(*m_rpcConnector.get(), m_client->userAccounts(), m_client.get()));
	connect(m_web3Server.get(), &Web3Server::newTransaction, this, &ClientModel::onNewTransaction, Qt::DirectConnection);
}

ClientModel::~ClientModel()
{
	m_runFuture.waitForFinished();
}

QString ClientModel::apiCall(QString const& _message)
{
	try
	{
		m_rpcConnector->OnRequest(_message.toStdString(), nullptr);
		return m_rpcConnector->response();
	}
	catch (...)
	{
		cerr << boost::current_exception_diagnostic_information();
		return QString();
	}
}

void ClientModel::mine()
{
	if (m_running || m_mining)
		BOOST_THROW_EXCEPTION(ExecutionStateException());
	m_mining = true;
	emit miningStarted();
	emit miningStateChanged();
	m_runFuture = QtConcurrent::run([=]()
	{
		try
		{
			m_client->mine();
			newBlock();
			m_mining = false;
			emit miningComplete();
		}
		catch (...)
		{
			m_mining = false;
			cerr << boost::current_exception_diagnostic_information();
			emit runFailed(QString::fromStdString(boost::current_exception_diagnostic_information()));
		}
		emit miningStateChanged();
	});
}

QString ClientModel::newSecret()
{
	KeyPair a = KeyPair::create();
	return QString::fromStdString(toHex(a.secret().ref()));
}

QString ClientModel::address(QString const& _secret)
{
	return QString::fromStdString(toHex(KeyPair(Secret(_secret.toStdString())).address().ref()));
}

QString ClientModel::encodeAbiString(QString _string)
{
	ContractCallDataEncoder encoder;
	return QString::fromStdString(toHex(encoder.encodeBytes(_string)));
}

QVariantMap ClientModel::contractAddresses() const
{
	QVariantMap res;
	for (auto const& c: m_contractAddresses)
		res.insert(c.first, QString::fromStdString(toJS(c.second)));
	return res;
}

QVariantMap ClientModel::gasCosts() const
{
	QVariantMap res;
	for (auto const& c: m_gasCosts)
		res.insert(c.first, QVariant::fromValue(static_cast<int>(c.second)));
	return res;
}

void ClientModel::setupState(QVariantMap _state)
{
	QVariantList balances = _state.value("accounts").toList();
	QVariantList transactions = _state.value("transactions").toList();

	map<Secret, u256> accounts;
	for (auto const& b: balances)
	{
		QVariantMap address = b.toMap();
		accounts.insert(make_pair(Secret(address.value("secret").toString().toStdString()), (qvariant_cast<QEther*>(address.value("balance")))->toU256Wei()));
	}

	vector<TransactionSettings> transactionSequence;
	for (auto const& t: transactions)
	{
		QVariantMap transaction = t.toMap();
		QString contractId = transaction.value("contractId").toString();
		QString functionId = transaction.value("functionId").toString();
		u256 gas = boost::get<u256>(qvariant_cast<QBigInt*>(transaction.value("gas"))->internalValue());
		bool gasAuto = transaction.value("gasAuto").toBool();
		u256 value = (qvariant_cast<QEther*>(transaction.value("value")))->toU256Wei();
		u256 gasPrice = (qvariant_cast<QEther*>(transaction.value("gasPrice")))->toU256Wei();
		QString sender = transaction.value("sender").toString();
		bool isStdContract = (transaction.value("stdContract").toBool());
		if (isStdContract)
		{
			if (contractId.isEmpty()) //TODO: This is to support old project files, remove later
				contractId = functionId;
			TransactionSettings transactionSettings(contractId, transaction.value("url").toString());
			transactionSettings.gasPrice = 10000000000000;
			transactionSettings.gasAuto = true;
			transactionSettings.value = 0;
			transactionSettings.sender = Secret(sender.toStdString());
			transactionSequence.push_back(transactionSettings);
		}
		else
		{
			if (contractId.isEmpty() && m_codeModel->hasContract()) //TODO: This is to support old project files, remove later
				contractId = m_codeModel->contracts().keys()[0];
			TransactionSettings transactionSettings(contractId, functionId, value, gas, gasAuto, gasPrice, Secret(sender.toStdString()));
			transactionSettings.parameterValues = transaction.value("parameters").toMap();

			if (contractId == functionId || functionId == "Constructor")
				transactionSettings.functionId.clear();

			transactionSequence.push_back(transactionSettings);
		}
	}
	executeSequence(transactionSequence, accounts, Secret(_state.value("miner").toMap().value("secret").toString().toStdString()));
}

void ClientModel::executeSequence(vector<TransactionSettings> const& _sequence, map<Secret, u256> const& _balances, Secret const& _miner)
{
	if (m_running)
	{
		qWarning() << "Waiting for current execution to complete";
		m_runFuture.waitForFinished();
	}
	m_running = true;

	emit runStarted();
	emit runStateChanged();

	m_client->resetState(_balances, _miner);
	m_web3Server->setAccounts(m_client->userAccounts());
	//run sequence
	m_runFuture = QtConcurrent::run([=]()
	{
		try
		{
			onStateReset();
			for (TransactionSettings const& transaction: _sequence)
			{
				ContractCallDataEncoder encoder;
				if (!transaction.stdContractUrl.isEmpty())
				{
					//std contract
					bytes const& stdContractCode = m_codeModel->getStdContractCode(transaction.contractId, transaction.stdContractUrl);
					TransactionSettings stdTransaction = transaction;
					stdTransaction.gasAuto = true;
					Address address = deployContract(stdContractCode, stdTransaction);
					m_stdContractAddresses[stdTransaction.contractId] = address;
					m_stdContractNames[address] = stdTransaction.contractId;
				}
				else
				{
					//encode data
					CompiledContract const& compilerRes = m_codeModel->contract(transaction.contractId);
					QFunctionDefinition const* f = nullptr;
					bytes contractCode = compilerRes.bytes();
					shared_ptr<QContractDefinition> contractDef = compilerRes.sharedContract();
					if (transaction.functionId.isEmpty())
						f = contractDef->constructor();
					else
						for (QFunctionDefinition const* tf: contractDef->functionsList())
							if (tf->name() == transaction.functionId)
							{
								f = tf;
								break;
							}
					if (!f)
					{
						emit runFailed("Function '" + transaction.functionId + tr("' not found. Please check transactions or the contract code."));
						m_running = false;
						emit runStateChanged();
						return;
					}
					if (!transaction.functionId.isEmpty())
						encoder.encode(f);
					for (QVariableDeclaration const* p: f->parametersList())
					{
						QSolidityType const* type = p->type();
						QVariant value = transaction.parameterValues.value(p->name());
						encoder.encode(value, type->type());
					}

					if (transaction.functionId.isEmpty() || transaction.functionId == transaction.contractId)
					{
						bytes param = encoder.encodedData();
						contractCode.insert(contractCode.end(), param.begin(), param.end());
						Address newAddress = deployContract(contractCode, transaction);
						auto contractAddressIter = m_contractAddresses.find(transaction.contractId);
						if (contractAddressIter == m_contractAddresses.end() || newAddress != contractAddressIter->second)
						{
							m_contractAddresses[transaction.contractId] = newAddress;
							m_contractNames[newAddress] = transaction.contractId;
							contractAddressesChanged();
						}
						gasCostsChanged();
						m_gasCosts[transaction.contractId] = m_client->lastExecution().gasUsed;
					}
					else
					{
						auto contractAddressIter = m_contractAddresses.find(transaction.contractId);
						if (contractAddressIter == m_contractAddresses.end())
						{
							emit runFailed("Contract '" + transaction.contractId + tr(" not deployed.") + "' " + tr(" Cannot call ") + transaction.functionId);
							m_running = false;
							emit runStateChanged();
							return;
						}
						callContract(contractAddressIter->second, encoder.encodedData(), transaction);
					}
				}
				onNewTransaction();
			}
			m_running = false;
			emit runComplete();
		}
		catch(boost::exception const&)
		{
			cerr << boost::current_exception_diagnostic_information();
			emit runFailed(QString::fromStdString(boost::current_exception_diagnostic_information()));
		}
		catch(exception const& e)
		{
			cerr << boost::current_exception_diagnostic_information();
			emit runFailed(e.what());
		}
		m_running = false;
		emit runStateChanged();
	});
}

void ClientModel::showDebugger()
{
	ExecutionResult last = m_client->lastExecution();
	showDebuggerForTransaction(last);
}

void ClientModel::showDebuggerForTransaction(ExecutionResult const& _t)
{
	//we need to wrap states in a QObject before sending to QML.
	QDebugData* debugData = new QDebugData();
	QQmlEngine::setObjectOwnership(debugData, QQmlEngine::JavaScriptOwnership);
	QList<QCode*> codes;
	QList<QHash<int, int>> codeMaps;
	QList<AssemblyItems> codeItems;
	QList<CompiledContract const*> contracts;
	for (MachineCode const& code: _t.executionCode)
	{
		QHash<int, int> codeMap;
		codes.push_back(QMachineState::getHumanReadableCode(debugData, code.address, code.code, codeMap));
		codeMaps.push_back(move(codeMap));
		//try to resolve contract for source level debugging
		auto nameIter = m_contractNames.find(code.address);
		CompiledContract const* compilerRes = nullptr;
		if (nameIter != m_contractNames.end() && (compilerRes = m_codeModel->tryGetContract(nameIter->second)))
		{
			eth::AssemblyItems assemblyItems = !_t.isConstructor() ? compilerRes->assemblyItems() : compilerRes->constructorAssemblyItems();
			codes.back()->setDocument(compilerRes->documentId());
			codeItems.push_back(move(assemblyItems));
			contracts.push_back(compilerRes);
		}
		else
		{
			codeItems.push_back(AssemblyItems());
			contracts.push_back(nullptr);
		}
	}

	QList<QCallData*> data;
	for (bytes const& d: _t.transactionData)
		data.push_back(QMachineState::getDebugCallData(debugData, d));

	QVariantList states;
	QVariantList solCallStack;
	map<int, QVariableDeclaration*> solLocals; //<stack pos, decl>
	map<QString, QVariableDeclaration*> storageDeclarations; //<name, decl>

	unsigned prevInstructionIndex = 0;
	for (MachineState const& s: _t.machineStates)
	{
		int instructionIndex = codeMaps[s.codeIndex][static_cast<unsigned>(s.curPC)];
		QSolState* solState = nullptr;
		if (!codeItems[s.codeIndex].empty() && contracts[s.codeIndex])
		{
			CompiledContract const* contract = contracts[s.codeIndex];
			AssemblyItem const& instruction = codeItems[s.codeIndex][instructionIndex];

			if (instruction.type() == eth::Push && !instruction.data())
			{
				//register new local variable initialization
				auto localIter = contract->locals().find(LocationPair(instruction.getLocation().start, instruction.getLocation().end));
				if (localIter != contract->locals().end())
					solLocals[s.stack.size()] = new QVariableDeclaration(debugData, localIter.value().name.toStdString(), localIter.value().type);
			}

			if (instruction.type() == eth::Tag)
			{
				//track calls into functions
				AssemblyItem const& prevInstruction = codeItems[s.codeIndex][prevInstructionIndex];
				auto functionIter = contract->functions().find(LocationPair(instruction.getLocation().start, instruction.getLocation().end));
				if (functionIter != contract->functions().end() && ((prevInstruction.getJumpType() == AssemblyItem::JumpType::IntoFunction) || solCallStack.empty()))
					solCallStack.push_back(QVariant::fromValue(functionIter.value()));
				else if (prevInstruction.getJumpType() == AssemblyItem::JumpType::OutOfFunction && !solCallStack.empty())
					solCallStack.pop_back();
			}

			//format solidity context values
			QVariantMap locals;
			QVariantList localDeclarations;
			QVariantMap localValues;
			for (auto l: solLocals)
				if (l.first < (int)s.stack.size())
				{
					if (l.second->type()->name().startsWith("mapping"))
						break; //mapping type not yet managed
					localDeclarations.push_back(QVariant::fromValue(l.second));
					localValues[l.second->name()] = formatValue(l.second->type()->type(), s.stack[l.first]);
				}
			locals["variables"] = localDeclarations;
			locals["values"] = localValues;

			QVariantMap storage;
			QVariantList storageDeclarationList;
			QVariantMap storageValues;
			for (auto st: s.storage)
				if (st.first < numeric_limits<unsigned>::max())
				{
					auto storageIter = contract->storage().find(static_cast<unsigned>(st.first));
					if (storageIter != contract->storage().end())
					{
						QVariableDeclaration* storageDec = nullptr;
						for (SolidityDeclaration const& codeDec : storageIter.value())
						{
							if (codeDec.type.name.startsWith("mapping"))
								continue; //mapping type not yet managed
							auto decIter = storageDeclarations.find(codeDec.name);
							if (decIter != storageDeclarations.end())
								storageDec = decIter->second;
							else
							{
								storageDec = new QVariableDeclaration(debugData, codeDec.name.toStdString(), codeDec.type);
								storageDeclarations[storageDec->name()] = storageDec;
							}
							storageDeclarationList.push_back(QVariant::fromValue(storageDec));
							storageValues[storageDec->name()] = formatStorageValue(storageDec->type()->type(), s.storage, codeDec.offset, codeDec.slot);
						}
					}
				}
			storage["variables"] = storageDeclarationList;
			storage["values"] = storageValues;

			prevInstructionIndex = instructionIndex;

			SourceLocation location = instruction.getLocation();
			if (contract->contract()->location() == location || contract->functions().contains(LocationPair(location.start, location.end)))
				location = dev::SourceLocation(-1, -1, location.sourceName);

			solState = new QSolState(debugData, move(storage), move(solCallStack), move(locals), location.start, location.end, QString::fromUtf8(location.sourceName->c_str()));
		}

		states.append(QVariant::fromValue(new QMachineState(debugData, instructionIndex, s, codes[s.codeIndex], data[s.dataIndex], solState)));
	}

	debugData->setStates(move(states));
	debugDataReady(debugData);
}

QVariant ClientModel::formatValue(SolidityType const& _type, u256 const& _value)
{
	ContractCallDataEncoder decoder;
	bytes val = toBigEndian(_value);
	QVariant res = decoder.decode(_type, val);
	return res;
}

QVariant ClientModel::formatStorageValue(SolidityType const& _type, map<u256, u256> const& _storage, unsigned _offset, u256 const& _slot)
{
	u256 slot = _slot;
	QVariantList values;
	ContractCallDataEncoder decoder;
	u256 count = 1;
	if (_type.dynamicSize)
	{
		count = _storage.at(slot);
		slot = fromBigEndian<u256>(sha3(toBigEndian(slot)).asBytes());
	}
	else if (_type.array)
		count = _type.count;

	unsigned offset = _offset;
	while (count--)
	{

		auto slotIter = _storage.find(slot);
		u256 slotValue = slotIter != _storage.end() ? slotIter->second : u256();
		bytes slotBytes = toBigEndian(slotValue);
		auto start = slotBytes.end() - _type.size - offset;
		bytes val(32 - _type.size); //prepend with zeroes
		val.insert(val.end(), start, start + _type.size);
		values.append(decoder.decode(_type, val));
		offset += _type.size;
		if ((offset + _type.size) > 32)
		{
			slot++;
			offset = 0;
		}
	}

	if (!_type.array)
		return values[0];

	return QVariant::fromValue(values);
}

void ClientModel::emptyRecord()
{
	debugDataReady(new QDebugData());
}

void ClientModel::debugRecord(unsigned _index)
{
	ExecutionResult e = m_client->execution(_index);
	showDebuggerForTransaction(e);
}

Address ClientModel::deployContract(bytes const& _code, TransactionSettings const& _ctrTransaction)
{
	Address newAddress = m_client->submitTransaction(_ctrTransaction.sender, _ctrTransaction.value, _code, _ctrTransaction.gas, _ctrTransaction.gasPrice, _ctrTransaction.gasAuto);
	return newAddress;
}

void ClientModel::callContract(Address const& _contract, bytes const& _data, TransactionSettings const& _tr)
{
	m_client->submitTransaction(_tr.sender, _tr.value, _contract, _data, _tr.gas, _tr.gasPrice, _tr.gasAuto);
}

RecordLogEntry* ClientModel::lastBlock() const
{
	eth::BlockInfo blockInfo = m_client->blockInfo();
	stringstream strGas;
	strGas << blockInfo.gasUsed;
	stringstream strNumber;
	strNumber << blockInfo.number;
	RecordLogEntry* record =  new RecordLogEntry(0, QString::fromStdString(strNumber.str()), tr(" - Block - "), tr("Hash: ") + QString(QString::fromStdString(toHex(blockInfo.hash().ref()))), QString(), QString(), QString(), false, RecordLogEntry::RecordType::Block, QString::fromStdString(strGas.str()));
	QQmlEngine::setObjectOwnership(record, QQmlEngine::JavaScriptOwnership);
	return record;
}

void ClientModel::onStateReset()
{
	m_contractAddresses.clear();
	m_contractNames.clear();
	m_stdContractAddresses.clear();
	m_stdContractNames.clear();
	emit stateCleared();
}

void ClientModel::onNewTransaction()
{
	ExecutionResult const& tr = m_client->lastExecution();
	unsigned block = m_client->number() + 1;
	unsigned recordIndex = tr.executonIndex;
	QString transactionIndex = tr.isCall() ? QObject::tr("Call") : QString("%1:%2").arg(block).arg(tr.transactionIndex);
	QString address = QString::fromStdString(toJS(tr.address));
	QString value = QString::fromStdString(toString(tr.value));
	QString contract = address;
	QString function;
	QString returned;
	QString gasUsed;

	bool creation = (bool)tr.contractAddress;

	if (!tr.isCall())
		gasUsed = QString::fromStdString(toString(tr.gasUsed));

	//TODO: handle value transfer
	FixedHash<4> functionHash;
	bool abi = false;
	if (creation)
	{
		//contract creation
		auto const stdContractName = m_stdContractNames.find(tr.contractAddress);
		if (stdContractName != m_stdContractNames.end())
		{
			function = stdContractName->second;
			contract = function;
		}
		else
			function = QObject::tr("Constructor");
		address = QObject::tr("(Create contract)");
	}
	else
	{
		//transaction/call
		if (tr.transactionData.size() > 0 && tr.transactionData.front().size() >= 4)
		{
			functionHash = FixedHash<4>(tr.transactionData.front().data(), FixedHash<4>::ConstructFromPointer);
			function = QString::fromStdString(toJS(functionHash));
			abi = true;
		}
		else
			function = QObject::tr("<none>");
	}

	if (creation)
		returned = QString::fromStdString(toJS(tr.contractAddress));

	Address contractAddress = (bool)tr.address ? tr.address : tr.contractAddress;
	auto contractAddressIter = m_contractNames.find(contractAddress);
	if (contractAddressIter != m_contractNames.end())
	{
		CompiledContract const& compilerRes = m_codeModel->contract(contractAddressIter->second);
		const QContractDefinition* def = compilerRes.contract();
		contract = def->name();
		if (abi)
		{
			QFunctionDefinition const* funcDef = def->getFunction(functionHash);
			if (funcDef)
			{
				function = funcDef->name();
				ContractCallDataEncoder encoder;
				QStringList returnValues = encoder.decode(funcDef->returnParameters(), tr.result.output);
				returned += "(";
				returned += returnValues.join(", ");
				returned += ")";
			}
		}
	}

	RecordLogEntry* log = new RecordLogEntry(recordIndex, transactionIndex, contract, function, value, address, returned, tr.isCall(), RecordLogEntry::RecordType::Transaction, gasUsed);
	QQmlEngine::setObjectOwnership(log, QQmlEngine::JavaScriptOwnership);
	emit newRecord(log);
}

}
}