/*
	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 CommonIO.cpp
 * @author Gav Wood <i@gavwood.com>
 * @date 2014
 */

#include "CommonIO.h"
#include <iostream>
#include <cstdlib>
#include <fstream>
#include "Exceptions.h"
#include <stdio.h>
#ifdef _WIN32
#include <windows.h>
#else
#include <termios.h>
#endif
using namespace std;
using namespace dev;

string dev::memDump(bytes const& _bytes, unsigned _width, bool _html)
{
	stringstream ret;
	if (_html)
		ret << "<pre style=\"font-family: Monospace,Lucida Console,Courier,Courier New,sans-serif; font-size: small\">";
	for (unsigned i = 0; i < _bytes.size(); i += _width)
	{
		ret << hex << setw(4) << setfill('0') << i << " ";
		for (unsigned j = i; j < i + _width; ++j)
			if (j < _bytes.size())
				if (_bytes[j] >= 32 && _bytes[j] < 127)
					if ((char)_bytes[j] == '<' && _html)
						ret << "&lt;";
					else if ((char)_bytes[j] == '&' && _html)
						ret << "&amp;";
					else
						ret << (char)_bytes[j];
				else
					ret << '?';
			else
				ret << ' ';
		ret << " ";
		for (unsigned j = i; j < i + _width && j < _bytes.size(); ++j)
			ret << setfill('0') << setw(2) << hex << (unsigned)_bytes[j] << " ";
		ret << "\n";
	}
	if (_html)
		ret << "</pre>";
	return ret.str();
}

// Don't forget to delete[] later.
bytesRef dev::contentsNew(std::string const& _file, bytesRef _dest)
{
	std::ifstream is(_file, std::ifstream::binary);
	if (!is)
		return bytesRef();
	// get length of file:
	is.seekg (0, is.end);
	streamoff length = is.tellg();
	if (length == 0) // return early, MSVC does not like reading 0 bytes
		return bytesRef();
	if (!_dest.empty() && _dest.size() != (unsigned)length)
		return bytesRef();
	is.seekg (0, is.beg);
	bytesRef ret = _dest.empty() ? bytesRef(new byte[length], length) : _dest;
	is.read((char*)ret.data(), length);
	is.close();
	return ret;
}

bytes dev::contents(std::string const& _file)
{
	std::ifstream is(_file, std::ifstream::binary);
	if (!is)
		return bytes();
	// get length of file:
	is.seekg (0, is.end);
	streamoff length = is.tellg();
	if (length == 0) // return early, MSVC does not like reading 0 bytes
		return bytes();
	is.seekg (0, is.beg);
	bytes ret(length);
	is.read((char*)ret.data(), length);
	is.close();
	return ret;
}

string dev::contentsString(std::string const& _file)
{
	std::ifstream is(_file, std::ifstream::binary);
	if (!is)
		return string();
	// get length of file:
	is.seekg (0, is.end);
	streamoff length = is.tellg();
	if (length == 0) // return early, MSVC does not like reading 0 bytes
		return string();
	is.seekg (0, is.beg);
	string ret;
	ret.resize(length);
	is.read((char*)ret.data(), length);
	is.close();
	return ret;
}

void dev::writeFile(std::string const& _file, bytesConstRef _data)
{
	ofstream(_file, ios::trunc|ios::binary).write((char const*)_data.data(), _data.size());
}

std::string dev::getPassword(std::string const& _prompt)
{
#if WIN32
	cout << _prompt << flush;
	// Get current Console input flags
	HANDLE hStdin;
	DWORD fdwSaveOldMode;
	if ((hStdin = GetStdHandle(STD_INPUT_HANDLE)) == INVALID_HANDLE_VALUE)
		BOOST_THROW_EXCEPTION(ExternalFunctionFailure("GetStdHandle"));
	if (!GetConsoleMode(hStdin, &fdwSaveOldMode))
		BOOST_THROW_EXCEPTION(ExternalFunctionFailure("GetConsoleMode"));
	// Set console flags to no echo
	if (!SetConsoleMode(hStdin, fdwSaveOldMode & (~ENABLE_ECHO_INPUT)))
		BOOST_THROW_EXCEPTION(ExternalFunctionFailure("SetConsoleMode"));
	// Read the string
	std::string ret;
	std::getline(cin, ret);
	// Restore old input mode
	if (!SetConsoleMode(hStdin, fdwSaveOldMode))
		BOOST_THROW_EXCEPTION(ExternalFunctionFailure("SetConsoleMode"));
	return ret;
#else
	struct termios oflags;
	struct termios nflags;
	char password[256];

	// disable echo in the terminal
	tcgetattr(fileno(stdin), &oflags);
	nflags = oflags;
	nflags.c_lflag &= ~ECHO;
	nflags.c_lflag |= ECHONL;

	if (tcsetattr(fileno(stdin), TCSANOW, &nflags) != 0)
		BOOST_THROW_EXCEPTION(ExternalFunctionFailure("tcsetattr"));

	printf("%s", _prompt.c_str());
	if (!fgets(password, sizeof(password), stdin))
		BOOST_THROW_EXCEPTION(ExternalFunctionFailure("fgets"));
	password[strlen(password) - 1] = 0;

	// restore terminal
	if (tcsetattr(fileno(stdin), TCSANOW, &oflags) != 0)
		BOOST_THROW_EXCEPTION(ExternalFunctionFailure("tcsetattr"));


	return password;
#endif
}