// ================================================================================
// ==      This file is a part of Turbo Badger. (C) 2011-2014, Emil Segerås      ==
// ==                     See tb_core.h for more information.                    ==
// ================================================================================

#ifndef TB_SYSTEM_H
#define TB_SYSTEM_H

#include "tb_core.h"
#include "tb_str.h"

#ifdef TB_RUNTIME_DEBUG_INFO
void TBDebugOut(const char *str);
#define TBDebugPrint(str, ...) { tb::TBStr tmp; tmp.SetFormatted(str, __VA_ARGS__); TBDebugOut(tmp); }
#else
#define TBDebugOut(str) ((void)0)
#define TBDebugPrint(str, ...) ((void)0)
#endif

namespace tb {

// == Platform interface ===================================================

/** TBSystem is porting interface for the underlaying OS. */
class TBSystem
{
public:
    /** Get the system time in milliseconds since some undefined epoch. */
    static double GetTimeMS();

    /** Called when the need to call TBMessageHandler::ProcessMessages has changed due to changes in the
        message queue. fire_time is the new time is needs to be called.
        It may be 0 which means that ProcessMessages should be called asap (but NOT from this call!)
        It may also be TB_NOT_SOON which means that ProcessMessages doesn't need to be called. */
    static void RescheduleTimer(double fire_time);

    /** Get how many milliseconds it should take after a touch down event should generate a long click
        event. */
    static int GetLongClickDelayMS();

    /** Get how many pixels of dragging should start panning scrollable widgets. */
    static int GetPanThreshold();

    /** Get how many pixels a typical line is: The length that should be scrolled when turning a mouse
        wheel one notch. */
    static int GetPixelsPerLine();

    /** Get Dots Per Inch for the main screen. */
    static int GetDPI();
};

/** TBClipboard is a porting interface for the clipboard. */
class TBClipboard
{
public:
    /** Empty the contents of the clipboard. */
    static void Empty();

    /** Return true if the clipboard currently contains text. */
    static bool HasText();

    /** Set the text of the clipboard in UTF-8 format. */
    static bool SetText(const char *text);

    /** Get the text from the clipboard in UTF-8 format.
        Returns true on success. */
    static bool GetText(TBStr &text);
};

typedef void (*TBFileExternalReaderFunction)(const char* filename, void** data, unsigned* length);

/** TBFile is a porting interface for file access. */
class TBFile
{

    static TBFileExternalReaderFunction reader_function;

public:
    enum TBFileMode { MODE_READ };

    static TBFile *Open(const char *filename, TBFileMode mode);
    static void SetReaderFunction(TBFileExternalReaderFunction function) {  reader_function = function; }

    virtual ~TBFile() {}
    virtual long Size() = 0;
    virtual size_t Read(void *buf, size_t elemSize, size_t count) = 0;
};

}; // namespace tb

#endif // TB_SYSTEM_H