/******************************************************************************
 * Spine Runtimes License Agreement
 * Last updated January 1, 2020. Replaces all prior versions.
 *
 * Copyright (c) 2013-2020, Esoteric Software LLC
 *
 * Integration of the Spine Runtimes into software or otherwise creating
 * derivative works of the Spine Runtimes is permitted under the terms and
 * conditions of Section 2 of the Spine Editor License Agreement:
 * http://esotericsoftware.com/spine-editor-license
 *
 * Otherwise, it is permitted to integrate the Spine Runtimes into software
 * or otherwise create derivative works of the Spine Runtimes (collectively,
 * "Products"), provided that each user of the Products must obtain their own
 * Spine Editor license and redistribution of the Products in any form must
 * include this license and copyright notice.
 *
 * THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
 * BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *****************************************************************************/

#ifndef Spine_Extension_h
#define Spine_Extension_h

#include <spine/dll.h>
#include <stdlib.h>

#define SP_UNUSED(x) (void)(x)

namespace spine {
class String;

class SP_API SpineExtension {
public:
    template <typename T>
    static T *alloc(size_t num, const char *file, int line) {
        return (T *)getInstance()->_alloc(sizeof(T) * num, file, line);
    }

    template <typename T>
    static T *calloc(size_t num, const char *file, int line) {
        return (T *)getInstance()->_calloc(sizeof(T) * num, file, line);
    }

    template <typename T>
    static T *realloc(T *ptr, size_t num, const char *file, int line) {
        return (T *)getInstance()->_realloc(ptr, sizeof(T) * num, file, line);
    }

    template <typename T>
    static void free(T *ptr, const char *file, int line) {
        getInstance()->_free((void *)ptr, file, line);
    }

    static char *readFile(const String &path, int *length) {
        return getInstance()->_readFile(path, length);
    }

    static void setInstance(SpineExtension *inSpineExtension);

    static SpineExtension *getInstance();

    virtual ~SpineExtension();

    /// Implement this function to use your own memory allocator
    virtual void *_alloc(size_t size, const char *file, int line) = 0;

    virtual void *_calloc(size_t size, const char *file, int line) = 0;

    virtual void *_realloc(void *ptr, size_t size, const char *file, int line) = 0;

    /// If you provide a spineAllocFunc, you should also provide a spineFreeFunc
    virtual void _free(void *mem, const char *file, int line) = 0;

    virtual char *_readFile(const String &path, int *length) = 0;

protected:
    SpineExtension();

private:
    static SpineExtension *_instance;
};

#ifndef __EMSCRIPTEN__
class SP_API DefaultSpineExtension : public SpineExtension {
public:
    DefaultSpineExtension();

    virtual ~DefaultSpineExtension();

protected:
    virtual void *_alloc(size_t size, const char *file, int line);

    virtual void *_calloc(size_t size, const char *file, int line);

    virtual void *_realloc(void *ptr, size_t size, const char *file, int line);

    virtual void _free(void *mem, const char *file, int line);

    virtual char *_readFile(const String &path, int *length);
};

#endif

// This function is to be implemented by engine specific runtimes to provide
// the default extension for that engine. It is called the first time
// SpineExtension::getInstance() is called, when no instance has been set
// yet.
extern SpineExtension *getDefaultExtension();

} // namespace spine

#endif /* Spine_Extension_h */
