/*
 * This file is part of the Code::Blocks IDE and licensed under the GNU Lesser General Public License, version 3
 * http://www.gnu.org/licenses/lgpl-3.0.html
 */

#if ( !defined(PREP_H) && defined(__cplusplus) )
#define PREP_H

#include <stdint.h>

#include <wx/defs.h> // wxIntPtr
#ifndef wxMAJOR_VERSION
    #include <wx/version.h>
#endif

#ifndef __has_feature
    #define __has_feature(x) 0
#endif

#if    !(((__GNUC__ == 4 && __GNUC_MINOR__ >= 6) || __GNUC__ > 4) && defined __GXX_EXPERIMENTAL_CXX0X__) \
    && !(defined(__clang__) && __has_feature(cxx_nullptr))
    // it is a const object...
    const class nullptr_t
    {
    public:
        // constructor
        nullptr_t() {}
        // convertible to any type of null non-member pointer...
        template<typename T> operator T* () const{ return (T*)0; }
        // or any type of null member pointer...
        template<typename C, typename T> operator T C::* () const { return (T C::*)0; }
        // support operator overloading (== and !=)
        template<typename T> bool equals(T const& rhs) const { return rhs == 0; }
    private:
        // can't take address of nullptr
        void operator&() const;
        // can't copyable
        nullptr_t(const nullptr_t&);
        const nullptr_t& operator=(const nullptr_t&);
    } nullptr_;
    #define nullptr nullptr_
    #define MOZ_HAVE_CXX11_NULLPTR // prevents mozilla/NullPtr.h from defining nullptr.

    template<typename T> inline bool operator==(const nullptr_t& lhs, T const& rhs) { return  lhs.equals(rhs); }
    template<typename T> inline bool operator==(T const& lhs, const nullptr_t& rhs) { return  rhs.equals(lhs); }
    template<typename T> inline bool operator!=(const nullptr_t& lhs, T const& rhs) { return !lhs.equals(rhs); }
    template<typename T> inline bool operator!=(T const& lhs, const nullptr_t& rhs) { return !rhs.equals(lhs); }
#endif

/*  ---------------------------------------------------------------------------------------------------------
    Version<major, minor, revision>::eval
        Integer compile-time constant that represents  a major.minor.revision style version number.
        This is the most convenient and efficient way to check for API-version dependent features,
        as it can be done as easily as:  if(foobar_version >= Version<1,2>::eval)
        The range of possible version numbers is [Version<0,0,0> , Version<63,1023,32767>]

    wxMinimumVersion<...>::eval, wxExactVersion<...>::eval
        Boolean values that are true if the compiled wxWidgets version is at least (exactly)
        the version given as parameters.

    Example:
        if(!wxMinimumVersion<2.8>::eval && (foo_version < Version<1.2>::eval))
            ErrorMessage("This feature is only supported under wxWidgets 2.8, or with Foo Component 1.2 or higher.");
*/
template <int major, int minor = 0, int revision = 0> struct Version { enum { eval = (major<<25) + (minor<<15) + revision }; };
inline void Version2MMR(int v, int& major, int& minor, int& revision) { major = v>>25; minor = (v>>15) & ((1<<10) -1); revision = v & ((1<<15) -1); }

template <int major, int minor, int rel = 0> struct wxMinimumVersion { enum { eval = ((unsigned int)  Version<wxMAJOR_VERSION, wxMINOR_VERSION, wxRELEASE_NUMBER>::eval >= (unsigned int) Version<major, minor, rel>::eval) }; };
template <int major, int minor, int rel = 0> struct wxExactVersion { enum { eval = ((unsigned int) Version<wxMAJOR_VERSION, wxMINOR_VERSION, wxRELEASE_NUMBER>::eval == (unsigned int) Version<major, minor, rel>::eval) }; };



/*  ---------------------------------------------------------------------------------------------------------
    Assert a condition at compile time (as assert() does at runtime)
    Break compilation if the assertion fails.

    Example:
        CompileTimeAssertion<wxMinimumVersion<2,6>::eval>::Assert();

        This example code will break the build if you try to compile the code with wxWindows 2.4 (or any
        other version below 2.6).
        However, it will break the build in such a way that the problem is apparent in the error message,
        rather than throwing up 317 obscure errors about whatever undefined symbols and wrong types.
*/
template <bool b> struct CompileTimeAssertion{};
template<> struct CompileTimeAssertion<true> { static inline void Assert(){}; };



/*  ---------------------------------------------------------------------------------------------------------
    Conditional typedef, works the same way as the C++ ternary operator for lvalues does

    You want to do something like:
        typedef (condition ? true_type : false_type) my_type;

    This can for example be used to define a type as
        FILE under Unix / HANDLE under Windows
        int under wxWidgets 2.6 / size_t under wxWidgets 2.8
        STL iterator / wxContainer iterator / pointer ...
    and not having to worry about what it really is, without giving up type safety and without
    the nasty side effects that a #define might have.

    Example:
        typedef TernaryCondTypedef<wxMinimumVersion<2,5>::eval, wxTreeItemIdValue, long int>::eval tree_cookie_t;
*/
template <bool cond, class true_t, class false_t> struct TernaryCondTypedef { typedef true_t eval; };
template <class true_t, class false_t> struct TernaryCondTypedef<false, true_t, false_t> { typedef false_t eval; };



/*  ---------------------------------------------------------------------------------------------------------
    Size of an array (if the compiler can determine it at compile time)
    Write:
        int widths[] = {5, 3, 8};
        myListControl->SetWidths(widths, array_size(widths));
    instead of:
        int widths[] = {5, 3, 8};
        myListControl->SetWidths(widths, 4); // oh crap, why does this crash?
*/
template <typename T> unsigned int array_size(const T& array) { enum {result = sizeof(array) / sizeof(array[0])}; return result; }



/*  ---------------------------------------------------------------------------------------------------------
    Delete a pointer and (semi-atomically) set it to zero.
    In class destructors, please continue using the normal C++ delete operator (it is unnecessary overhead
    to set a pointer to zero in the destructor, as it can never be used again).
    In _all_ other cases, use Delete(), which prevents accidential double-deletes.
*/
template<typename T>inline void Delete(T*& p){delete p; p = nullptr;}
template<typename T>inline void DeleteArray(T*& p){delete[] p; p = nullptr;}



/*  ---------------------------------------------------------------------------------------------------------
    platform::id
        Value of type platform::identifier describing the target platform

    platform::windows, platform::macosx, platform::linux
    platform::freebsd, platform::netbsd, platform::openbsd
    platform::darwin,  platform::solaris, platform::unix
        Boolean value that evaluates to true if the target platform is the same as the variable's name, false otherwise.
        Using the platform booleans is equivalent to using platform::id, but results in nicer code.

    platform::unicode
        Boolean value that evaluates to true if this application was built in Unicode mode. Of course this does not
        tell anything about the host system's actual capabilities.

    platform::gtk
    platform::carbon
    platform::cocoa
        Boolean values showing the presence of very specific toolkits. Use only for workarounds to specific problems with these.

    platform::bits
        Size of pointer in bits as a measure of CPU architecture (32 or 64 bits).

    platform::gcc
        The gcc version number as Version<...> if gcc was used to build the program, zero otherwise.
*/
namespace platform
{
    enum identifier
    {
        platform_unknown,
        platform_windows,
        platform_linux,
        platform_freebsd,
        platform_netbsd,
        platform_openbsd,
        platform_darwin,
        platform_solaris,
        platform_macosx
    };

    // unfortunately we still need to use the preprocessor here...
    #if ( wxUSE_UNICODE )
    const bool unicode = true;
    #else
    const bool unicode = false;
    #endif

    #if   defined ( __WIN32__ ) || defined ( _WIN64 )
    const identifier id = platform_windows;
    #elif defined ( __WXMAC__ )  || defined ( __WXCOCOA__ )
    const identifier id = platform_macosx;
    #elif defined ( __linux__ )  || defined ( LINUX )
    const identifier id = platform_linux;
    #elif defined ( FREEBSD )    || defined ( __FREEBSD__ )
    const identifier id = platform_freebsd;
    #elif defined ( NETBSD )     || defined ( __NETBSD__ )
    const identifier id = platform_netbsd;
    #elif defined ( OPENBSD )    || defined ( __OPENBSD__ )
    const identifier id = platform_openbsd;
    #elif defined ( DARWIN )     || defined ( __APPLE__ )
    const identifier id = platform_darwin;
    #elif defined(sun) || defined(__sun)
    const identifier id = platform_solaris;
    #else
    const identifier id = platform_unknown;
    #endif

    #if   defined ( __WXGTK__ )
    const bool gtk = true;
    #else
    const bool gtk = false;
    #endif

    #if   defined ( __WXMAC__ )
    const bool carbon = true;
    #else
    const bool carbon = false;
    #endif

    #if   defined ( __WXCOCOA__ )
    const bool cocoa = true;
    #else
    const bool cocoa = false;
    #endif

    const bool windows = (id == platform_windows);
    const bool macosx  = (id == platform_macosx);
    const bool linux   = (id == platform_linux);
    const bool freebsd = (id == platform_freebsd);
    const bool netbsd  = (id == platform_netbsd);
    const bool openbsd = (id == platform_openbsd);
    const bool darwin  = (id == platform_darwin);
    const bool solaris = (id == platform_solaris);
    const bool unix    = (linux | freebsd | netbsd | openbsd | darwin | solaris);

    const int bits = 8*sizeof(void*);

    // Function and parameter attributes
    // ----------------------------------
    //
    // These parameters possibly allow more fine-grained optimization and better diagnostics.
    // They are implemented for the GCC compiler family and 'quiet' for all others
    //
    // IMPORTANT: Do not lie to the compiler when marking functions pure or const, or you will cause great evil.
    //
    // a) Optimization hints:
    //
    // cb_pure_function        Function has no observable effects other than the return value
    //                         and the return value depends only on parameters and global variables
    //                         ALSO: function does not throw (makes sense with the above requirement).
    //
    // cb_const_function       Function has no observable effects other than the return value
    //                         and the return value depends only on parameters.
    //                         ALSO: No external memory, including memory referenced by parameters, may be touched.
    //                         ALSO: function does not throw (makes sense with the above requirement).
    //
    // cb_force_inline         What the name says. This is the strongest available inline hint (the compiler may still ignore it).
    //
    //
    // b) Usage hints:
    //
    // cb_must_consume_result  The return value of a function must be consumed (usually because of taking ownership), i.e.
    //                         ObjType* result = function();  ---> valid
    //                         function();                    ---> will raise a warning
    //
    // cb_deprecated_function  The function is deprecated and may be removed in a future revision of the API.
    //                         New code should not call the function. Doing so will work, but will raise a warning.
    //
    // cb_optional             No warning will be raised if the parameter is not used. Identical to "unused",
    //                         but the wording sounds more like "you may omit using this" rather than "we are not using this"
    //                         Used for interfaces or base classes to convey the message that a (generally useful) parameter is passed,
	//                         but it is allowable to ignore the parameter (and maybe a base class implementation does just that).
    //
    // cb_unused               No warning will be raised if the parameter is not used.
    //                         Use this if you want to convey that you are aware of a parameter but you are intentionally not using it.
    //
    // POISON(message)         If you touch this, you'll die. The message tells you why.
    //                         ALSO: It will break the build, so nobody else must die.

    #if defined(__GNUC__) && ((100 * __GNUC__ + 10 * __GNUC_MINOR__ + __GNUC_PATCHLEVEL__) >= 332)
        const int gcc = Version<__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__>::eval;
        #define cb_pure_function       __attribute__ ((__pure__,  __nothrow__))
        #define cb_const_function      __attribute__ ((__const__, __nothrow__))
        #define cb_force_inline        __attribute__ ((__always_inline__))
        #define cb_must_consume_result __attribute__ ((__warn_unused_result__))
        #define cb_deprecated_function __attribute__ ((__deprecated__))
        #define cb_unused              __attribute__ ((__unused__))

        #if((100 * __GNUC__ + 10 *__GNUC_MINOR__ + __GNUC_PATCHLEVEL__) >= 436)
            #define POISON(message) __attribute__((__error__(#message))
        #else
            #define POISON(message)
        #endif
    #else
        const int gcc = 0;
        #define cb_pure_function
        #define cb_const_function
        #define cb_force_inline
        #define cb_must_consume_result
        #define cb_deprecated_function
        #define cb_unused
        #define POISON(message)
    #endif

    #define cb_optional cb_unused
}



/*  ---------------------------------------------------------------------------------------------------------
    Nobody except Yiannis touches these. You don't need to know, you don't want to know.
*/
namespace sdk
{
    const int version             = Version<1>::eval;
    const int buildsystem_version = Version<1>::eval;
    const int plugin_api_version  = Version<1,11,10>::eval;
}



/*  ---------------------------------------------------------------------------------------------------------
    The compatibility namespace is intended for workarounds that try to cope with incompatibilities in different
    wxWidgets versions. Since these often involve missing functions or constants, #ifdef is explicitly allowed
    and not frowned upon in this namespace.

    wxHideReadonly
        use in file selector dialog to keep wxWidgets 2.4/2.6 users happy (this flag is important for normal operation!),
        without breaking the 2.8 build.
*/
namespace compatibility
{
    #if defined(WXWIN_COMPATIBILITY_2_4) && defined(wxHIDE_READONLY)
        const int wxHideReadonly = wxHIDE_READONLY;
    #else
        const int wxHideReadonly = 0;
    #endif
}



/*  ---------------------------------------------------------------------------------------------------------
    Utility function for an incrementing (unique per instance) unsigned integer ID.
        - ID is unsigned, starting at zero (best choice for many cases, e.g. for use as array index)
        - if it _must_ start with 1 for some odd reason, simply add one extra call to GetID()<YourClass>
        - use GetID() for an application-wide unique integer ID (alias for GetID<void>())
        - use GetID<YourClass>() for your own private class-internal ID
        - use GetID<SomeStruct>() for your own private cross-class shareable ID

        ((  This is implementation is more general and uses one less temporary copy
            than the implementation found in several places of the SDK.
            NOTE: remove this paragraph once the SDK has been updated  ))

    Example:

        struct foo; // used for sharing an ID between A and B

        class A
        {
        public:
            unsigned int X(){return GetID(); };         // application-global
            unsigned int Y(){return GetID<A>(); };      // private for A
            unsigned int Z(){return GetID<foo>(); };    // shared with B

        };

        class B
        {
        public:
            unsigned int Y(){return GetID<B>(); };      // private for B
            unsigned int Z(){return GetID<foo>(); };    // shared with A
        };

        In this example, A::X() will return a counter that is globally unique throughout the lifetime of the application.
        A::Y() and B::Y() will return counters that increment independently for A and B. In other words,
        B does not know about A's counter, nor can it influence it.
        A::Z() and B::Z() will return a shared counter that increments if either A or B is asked to return a value.
*/

class ID
{
    wxIntPtr value;

    ID(wxIntPtr in) : value(in) {};

    template<typename> friend ID GetID();
    friend ID ConstructID(wxIntPtr);

public:

    ID() : value ((wxIntPtr) -1) {};

    operator wxIntPtr() const { return value; };
    operator void*() const { return reinterpret_cast<void*>(static_cast<uintptr_t>(value)); };

    bool Valid() const { return value != ((wxIntPtr) -1); };
    bool operator!() const { return !Valid(); };

    friend bool operator==(ID a, ID b)    { return a.value      == b.value; };
    friend bool operator==(ID a, int b)   { return a.value      == (wxIntPtr) b; };

    friend bool operator!=(ID a, ID b)    { return a.value      != b.value; };
    friend bool operator!=(ID a, int b)   { return a.value      != (wxIntPtr) b; };
};


template<typename whatever> inline ID GetID()
{
    static wxIntPtr id = (wxIntPtr) -1;
    return ID(++id);
}

inline ID GetID() { return GetID<void>(); }
inline ID ConstructID(wxIntPtr i) { return ID(i); }

// Just included to possibly set _LIBCPP_VERSION
#include <ciso646>

#if __cplusplus >= 201103L || defined(_LIBCPP_VERSION)
#include <memory>
#else
#include <tr1/memory>
#endif

// Add std::shared_ptr in a namespace, so different implementations can be used with different compilers
namespace cb
{
#if __cplusplus >= 201103L || defined(_LIBCPP_VERSION)
    using std::shared_ptr;
    using std::static_pointer_cast;
    using std::weak_ptr;
#else
    using std::tr1::shared_ptr;
    using std::tr1::static_pointer_cast;
    using std::tr1::weak_ptr;
#endif
}

#if defined(__APPLE__) && defined(__MACH__)
    #define CB_LIBRARY_ENVVAR _T("DYLD_LIBRARY_PATH")
#elif !defined(__WXMSW__)
    #define CB_LIBRARY_ENVVAR _T("LD_LIBRARY_PATH")
#else
    #define CB_LIBRARY_ENVVAR _T("PATH")
#endif

#endif
