/*

The MIT License (MIT)

Copyright (c) 2014 Graeme Hill (http://graemehill.ca)

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in

all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

THE SOFTWARE.

*/

#pragma once

#include <iostream>

#include <vector>

#include <sstream>

#include <string>

#include <iomanip>

#ifdef GUID_ANDROID

#include <jni.h>

#endif

// Class to represent a GUID/UUID. Each instance acts as a wrapper around a

// 16 byte value that can be passed around by value. It also supports

// conversion to string (via the stream operator <<) and conversion from a

// string via constructor.

class TSKGuid

{

  public:

    // create a guid from vector of bytes

    TSKGuid(const std::vector<unsigned char> &bytes);

    // create a guid from array of bytes

    TSKGuid(const unsigned char *bytes);

    // create a guid from string

    TSKGuid(const std::string &fromString);

    // create empty guid

    TSKGuid();

    TSKGuid(TSKGuid &&) = default;

    // copy constructor

    TSKGuid(const TSKGuid &other);

    // overload assignment operator

    TSKGuid &operator=(const TSKGuid &other);

    TSKGuid &operator=(TSKGuid &&) = default;

    // overload equality and inequality operator

    bool operator==(const TSKGuid &other) const;

    bool operator!=(const TSKGuid &other) const;

    std::string str() const;

    inline const std::vector<unsigned char> & bytes() const noexcept {

        return _bytes;

    }

  private:

    // actual data

    std::vector<unsigned char> _bytes;

    // make the << operator a friend so it can access _bytes

    friend std::ostream &operator<<(std::ostream &s, const TSKGuid &guid);

};

// Class that can create new guids. The only reason this exists instead of

// just a global "newGuid" function is because some platforms will require

// that there is some attached context. In the case of android, we need to

// know what JNIEnv is being used to call back to Java, but the newGuid()

// function would no longer be cross-platform if we parameterized the android

// version. Instead, construction of the GuidGenerator may be different on

// each platform, but the use of newGuid is uniform.

class GuidGenerator

{

  public:

#ifdef GUID_ANDROID

    GuidGenerator(JNIEnv *env);

#else

    GuidGenerator() { }

#endif

    TSKGuid newGuid();

#ifdef GUID_ANDROID

  private:

    JNIEnv *_env;

    jclass _uuidClass;

    jmethodID _newGuidMethod;

    jmethodID _mostSignificantBitsMethod;

    jmethodID _leastSignificantBitsMethod;

#endif

};