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+/*
+	This file is part of solidity.
+
+	solidity 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.
+
+	solidity 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 solidity.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * @author Christian <c@ethdev.com>
+ * @date 2014
+ * Framework for executing contracts and testing them using RPC.
+ */
+
+#pragma once
+
+#include <functional>
+
+#include "TestHelper.h"
+#include "RPCSession.h"
+
+#include <libdevcore/ABI.h>
+#include <libdevcore/FixedHash.h>
+
+namespace dev
+{
+namespace test
+{
+	using rational = boost::rational<dev::bigint>;
+	/// An Ethereum address: 20 bytes.
+	/// @NOTE This is not endian-specific; it's just a bunch of bytes.
+	using Address = h160;
+
+	// The various denominations; here for ease of use where needed within code.
+	static const u256 ether = exp10<18>();
+	static const u256 finney = exp10<15>();
+	static const u256 szabo = exp10<12>();
+	static const u256 shannon = exp10<9>();
+	static const u256 wei = exp10<0>();
+
+class ExecutionFramework
+{
+
+public:
+	ExecutionFramework();
+
+	virtual bytes const& compileAndRunWithoutCheck(
+		std::string const& _sourceCode,
+		u256 const& _value = 0,
+		std::string const& _contractName = "",
+		bytes const& _arguments = bytes(),
+		std::map<std::string, Address> const& _libraryAddresses = std::map<std::string, Address>()
+	) = 0;
+
+	bytes const& compileAndRun(
+		std::string const& _sourceCode,
+		u256 const& _value = 0,
+		std::string const& _contractName = "",
+		bytes const& _arguments = bytes(),
+		std::map<std::string, Address> const& _libraryAddresses = std::map<std::string, Address>()
+	)
+	{
+		compileAndRunWithoutCheck(_sourceCode, _value, _contractName, _arguments, _libraryAddresses);
+		BOOST_REQUIRE(!m_output.empty());
+		return m_output;
+	}
+
+	bytes const& callFallbackWithValue(u256 const& _value)
+	{
+		sendMessage(bytes(), false, _value);
+		return m_output;
+	}
+
+	bytes const & callFallback()
+	{
+		return callFallbackWithValue(0);
+	}
+
+	template <class... Args>
+	bytes const& callContractFunctionWithValue(std::string _sig, u256 const& _value, Args const&... _arguments)
+	{
+		FixedHash<4> hash(dev::keccak256(_sig));
+		sendMessage(hash.asBytes() + encodeArgs(_arguments...), false, _value);
+		return m_output;
+	}
+
+	template <class... Args>
+	bytes const& callContractFunction(std::string _sig, Args const&... _arguments)
+	{
+		return callContractFunctionWithValue(_sig, 0, _arguments...);
+	}
+
+	template <class CppFunction, class... Args>
+	void testContractAgainstCpp(std::string _sig, CppFunction const& _cppFunction, Args const&... _arguments)
+	{
+		bytes contractResult = callContractFunction(_sig, _arguments...);
+		bytes cppResult = callCppAndEncodeResult(_cppFunction, _arguments...);
+		BOOST_CHECK_MESSAGE(
+			contractResult == cppResult,
+			"Computed values do not match.\nContract: " +
+				toHex(contractResult) +
+				"\nC++:      " +
+				toHex(cppResult)
+		);
+	}
+
+	template <class CppFunction, class... Args>
+	void testContractAgainstCppOnRange(std::string _sig, CppFunction const& _cppFunction, u256 const& _rangeStart, u256 const& _rangeEnd)
+	{
+		for (u256 argument = _rangeStart; argument < _rangeEnd; ++argument)
+		{
+			bytes contractResult = callContractFunction(_sig, argument);
+			bytes cppResult = callCppAndEncodeResult(_cppFunction, argument);
+			BOOST_CHECK_MESSAGE(
+				contractResult == cppResult,
+				"Computed values do not match.\nContract: " +
+					toHex(contractResult) +
+					"\nC++:      " +
+					toHex(cppResult) +
+					"\nArgument: " +
+					toHex(encode(argument))
+			);
+		}
+	}
+
+	static bytes encode(bool _value) { return encode(byte(_value)); }
+	static bytes encode(int _value) { return encode(u256(_value)); }
+	static bytes encode(size_t _value) { return encode(u256(_value)); }
+	static bytes encode(char const* _value) { return encode(std::string(_value)); }
+	static bytes encode(byte _value) { return bytes(31, 0) + bytes{_value}; }
+	static bytes encode(u256 const& _value) { return toBigEndian(_value); }
+	/// @returns the fixed-point encoding of a rational number with a given
+	/// number of fractional bits.
+	static bytes encode(std::pair<rational, int> const& _valueAndPrecision)
+	{
+		rational const& value = _valueAndPrecision.first;
+		int fractionalBits = _valueAndPrecision.second;
+		return encode(u256((value.numerator() << fractionalBits) / value.denominator()));
+	}
+	static bytes encode(h256 const& _value) { return _value.asBytes(); }
+	static bytes encode(bytes const& _value, bool _padLeft = true)
+	{
+		bytes padding = bytes((32 - _value.size() % 32) % 32, 0);
+		return _padLeft ? padding + _value : _value + padding;
+	}
+	static bytes encode(std::string const& _value) { return encode(asBytes(_value), false); }
+	template <class _T>
+	static bytes encode(std::vector<_T> const& _value)
+	{
+		bytes ret;
+		for (auto const& v: _value)
+			ret += encode(v);
+		return ret;
+	}
+
+	template <class FirstArg, class... Args>
+	static bytes encodeArgs(FirstArg const& _firstArg, Args const&... _followingArgs)
+	{
+		return encode(_firstArg) + encodeArgs(_followingArgs...);
+	}
+	static bytes encodeArgs()
+	{
+		return bytes();
+	}
+	//@todo might be extended in the future
+	template <class Arg>
+	static bytes encodeDyn(Arg const& _arg)
+	{
+		return encodeArgs(u256(0x20), u256(_arg.size()), _arg);
+	}
+	class ContractInterface
+	{
+	public:
+		ContractInterface(ExecutionFramework& _framework): m_framework(_framework) {}
+
+		void setNextValue(u256 const& _value) { m_nextValue = _value; }
+
+	protected:
+		template <class... Args>
+		bytes const& call(std::string const& _sig, Args const&... _arguments)
+		{
+			auto const& ret = m_framework.callContractFunctionWithValue(_sig, m_nextValue, _arguments...);
+			m_nextValue = 0;
+			return ret;
+		}
+
+		void callString(std::string const& _name, std::string const& _arg)
+		{
+			BOOST_CHECK(call(_name + "(string)", u256(0x20), _arg.length(), _arg).empty());
+		}
+
+		void callStringAddress(std::string const& _name, std::string const& _arg1, u160 const& _arg2)
+		{
+			BOOST_CHECK(call(_name + "(string,address)", u256(0x40), _arg2, _arg1.length(), _arg1).empty());
+		}
+
+		void callStringAddressBool(std::string const& _name, std::string const& _arg1, u160 const& _arg2, bool _arg3)
+		{
+			BOOST_CHECK(call(_name + "(string,address,bool)", u256(0x60), _arg2, _arg3, _arg1.length(), _arg1).empty());
+		}
+
+		void callStringBytes32(std::string const& _name, std::string const& _arg1, h256 const& _arg2)
+		{
+			BOOST_CHECK(call(_name + "(string,bytes32)", u256(0x40), _arg2, _arg1.length(), _arg1).empty());
+		}
+
+		u160 callStringReturnsAddress(std::string const& _name, std::string const& _arg)
+		{
+			bytes const& ret = call(_name + "(string)", u256(0x20), _arg.length(), _arg);
+			BOOST_REQUIRE(ret.size() == 0x20);
+			BOOST_CHECK(std::count(ret.begin(), ret.begin() + 12, 0) == 12);
+			return eth::abiOut<u160>(ret);
+		}
+
+		std::string callAddressReturnsString(std::string const& _name, u160 const& _arg)
+		{
+			bytesConstRef ret = ref(call(_name + "(address)", _arg));
+			BOOST_REQUIRE(ret.size() >= 0x20);
+			u256 offset = eth::abiOut<u256>(ret);
+			BOOST_REQUIRE_EQUAL(offset, 0x20);
+			u256 len = eth::abiOut<u256>(ret);
+			BOOST_REQUIRE_EQUAL(ret.size(), ((len + 0x1f) / 0x20) * 0x20);
+			return ret.cropped(0, size_t(len)).toString();
+		}
+
+		h256 callStringReturnsBytes32(std::string const& _name, std::string const& _arg)
+		{
+			bytes const& ret = call(_name + "(string)", u256(0x20), _arg.length(), _arg);
+			BOOST_REQUIRE(ret.size() == 0x20);
+			return eth::abiOut<h256>(ret);
+		}
+
+	private:
+		u256 m_nextValue;
+		ExecutionFramework& m_framework;
+	};
+
+private:
+	template <class CppFunction, class... Args>
+	auto callCppAndEncodeResult(CppFunction const& _cppFunction, Args const&... _arguments)
+	-> typename std::enable_if<std::is_void<decltype(_cppFunction(_arguments...))>::value, bytes>::type
+	{
+		_cppFunction(_arguments...);
+		return bytes();
+	}
+	template <class CppFunction, class... Args>
+	auto callCppAndEncodeResult(CppFunction const& _cppFunction, Args const&... _arguments)
+	-> typename std::enable_if<!std::is_void<decltype(_cppFunction(_arguments...))>::value, bytes>::type
+	{
+		return encode(_cppFunction(_arguments...));
+	}
+
+protected:
+	void sendMessage(bytes const& _data, bool _isCreation, u256 const& _value = 0);
+	void sendEther(Address const& _to, u256 const& _value);
+	size_t currentTimestamp();
+
+	/// @returns the (potentially newly created) _ith address.
+	Address account(size_t _i);
+
+	u256 balanceAt(Address const& _addr);
+	bool storageEmpty(Address const& _addr);
+	bool addressHasCode(Address const& _addr);
+
+	RPCSession& m_rpc;
+
+	struct LogEntry
+	{
+		Address address;
+		std::vector<h256> topics;
+		bytes data;
+	};
+
+	size_t m_optimizeRuns = 200;
+	bool m_optimize = false;
+	Address m_sender;
+	Address m_contractAddress;
+	u256 const m_gasPrice = 100 * szabo;
+	u256 const m_gas = 100000000;
+	bytes m_output;
+	std::vector<LogEntry> m_logs;
+	u256 m_gasUsed;
+};
+
+}
+} // end namespaces
+