// text.h

/*
 *    Copyright 2010 10gen Inc.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

#pragma once

#include <vector>
#include <string>

#include "mongo/base/disallow_copying.h"

namespace mongo {

class StringSplitter {
public:
    /** @param big the string to be split
        @param splitter the delimiter
    */
    StringSplitter(const char* big, const char* splitter) : _big(big), _splitter(splitter) {}

    /** @return true if more to be taken via next() */
    bool more() const {
        return _big[0] != 0;
    }

    /** get next split string fragment */
    std::string next();

    void split(std::vector<std::string>& l);

    std::vector<std::string> split();

    static std::vector<std::string> split(const std::string& big, const std::string& splitter);

    static std::string join(const std::vector<std::string>& l, const std::string& split);

private:
    const char* _big;
    const char* _splitter;
};

/* This doesn't defend against ALL bad UTF8, but it will guarantee that the
 * string can be converted to sequence of codepoints. However, it doesn't
 * guarantee that the codepoints are valid.
 */
bool isValidUTF8(const char* s);
bool isValidUTF8(const std::string& s);

// expect that n contains a base ten number and nothing else after it
// NOTE win version hasn't been tested directly
long long parseLL(const char* n);

#if defined(_WIN32)

std::string toUtf8String(const std::wstring& wide);

std::wstring toWideString(const char* s);

bool writeUtf8ToWindowsConsole(const char* utf8String, unsigned int utf8StringSize);

/* like toWideString but UNICODE macro sensitive */
#if !defined(_UNICODE)
#error temp error
inline std::string toNativeString(const char* s) {
    return s;
}
#else
inline std::wstring toNativeString(const char* s) {
    return toWideString(s);
}
#endif

class WindowsCommandLine {
    MONGO_DISALLOW_COPYING(WindowsCommandLine);
    char** _argv;
    char** _envp;

public:
    WindowsCommandLine(int argc, wchar_t* argvW[], wchar_t* envpW[]);
    ~WindowsCommandLine();
    char** argv(void) const {
        return _argv;
    };
    char** envp(void) const {
        return _envp;
    };
};

#endif  // #if defined(_WIN32)

/**
 * Construct a Windows command line string, UTF-8 encoded, from a vector of
 * UTF-8 arguments, "argv".
 *
 * See "Parsing C++ Command-Line Arguments (C++)"
 * http://msdn.microsoft.com/en-us/library/windows/desktop/17w5ykft(v=vs.85).aspx
 */
std::string constructUtf8WindowsCommandLine(const std::vector<std::string>& argv);

}  // namespace mongo
