// Scintilla source code edit control
/** @file Platform.h
 ** Interface to platform facilities. Also includes some basic utilities.
 ** Implemented in PlatGTK.cxx for GTK+/Linux, PlatWin.cxx for Windows, and PlatWX.cxx for wxWindows.
 **/
// Copyright 1998-2003 by Neil Hodgson <neilh@scintilla.org>
// The License.txt file describes the conditions under which this software may be distributed.

#ifndef PLATFORM_H
#define PLATFORM_H

// PLAT_GTK = GTK+ on Linux or Win32
// PLAT_GTK_WIN32 is defined additionally when running PLAT_GTK under Win32
// PLAT_WIN = Win32 API on Win32 OS
// PLAT_WX is wxWindows on any supported platform

#define PLAT_GTK 0
#define PLAT_GTK_WIN32 0
#define PLAT_WIN 0
#define PLAT_WX  0
#define PLAT_FOX 0

#if defined(FOX)
#undef PLAT_FOX
#define PLAT_FOX 1

#elif defined(__WX__)
#undef PLAT_WX
#define PLAT_WX  1
#undef PLAT_WIN
#define PLAT_WIN 1

#elif defined(GTK)
#undef PLAT_GTK
#define PLAT_GTK 1
#undef PLAT_WX
#define PLAT_WX  1

#ifdef _MSC_VER
#undef PLAT_GTK_WIN32
#define PLAT_GTK_WIN32 1
#endif

#else
#undef PLAT_WIN
#define PLAT_WIN 1

#endif


// Underlying the implementation of the platform classes are platform specific types.
// Sometimes these need to be passed around by client code so they are defined here

typedef void *FontID;
typedef void *SurfaceID;
typedef void *WindowID;
typedef void *MenuID;
typedef void *TickerID;
typedef void *Function;
typedef void *IdlerID;

/**
 * A geometric point class.
 * Point is exactly the same as the Win32 POINT and GTK+ GdkPoint so can be used interchangeably.
 */
class Point {
public:
    int x;
    int y;

    explicit Point(int x_=0, int y_=0) : x(x_), y(y_) {
    }

    // Other automatically defined methods (assignment, copy constructor, destructor) are fine

    static Point FromLong(long lpoint);
};

/**
 * A geometric rectangle class.
 * PRectangle is exactly the same as the Win32 RECT so can be used interchangeably.
 * PRectangles contain their top and left sides, but not their right and bottom sides.
 */
class PRectangle {
public:
    int left;
    int top;
    int right;
    int bottom;

    PRectangle(int left_=0, int top_=0, int right_=0, int bottom_ = 0) :
        left(left_), top(top_), right(right_), bottom(bottom_) {
    }

    // Other automatically defined methods (assignment, copy constructor, destructor) are fine

    bool operator==(PRectangle &rc) {
        return (rc.left == left) && (rc.right == right) &&
            (rc.top == top) && (rc.bottom == bottom);
    }
    bool Contains(Point pt) {
        return (pt.x >= left) && (pt.x <= right) &&
            (pt.y >= top) && (pt.y <= bottom);
    }
    bool Contains(PRectangle rc) {
        return (rc.left >= left) && (rc.right <= right) &&
            (rc.top >= top) && (rc.bottom <= bottom);
    }
    bool Intersects(PRectangle other) {
        return (right > other.left) && (left < other.right) &&
            (bottom > other.top) && (top < other.bottom);
    }
    void Move(int xDelta, int yDelta) {
        left += xDelta;
        top += yDelta;
        right += xDelta;
        bottom += yDelta;
    }
    int Width() { return right - left; }
    int Height() { return bottom - top; }
};

/**
 * In some circumstances, including Win32 in paletted mode and GTK+, each colour
 * must be allocated before use. The desired colours are held in the ColourDesired class,
 * and after allocation the allocation entry is stored in the ColourAllocated class. In other
 * circumstances, such as Win32 in true colour mode, the allocation process just copies
 * the RGB values from the desired to the allocated class.
 * As each desired colour requires allocation before it can be used, the ColourPair class
 * holds both a ColourDesired and a ColourAllocated
 * The Palette class is responsible for managing the palette of colours which contains a
 * list of ColourPair objects and performs the allocation.
 */

/**
 * Holds a desired RGB colour.
 */
class ColourDesired {
    long co;
public:
    ColourDesired(long lcol=0) {
        co = lcol;
    }

    ColourDesired(unsigned int red, unsigned int green, unsigned int blue) {
        Set(red, green, blue);
    }

    bool operator==(const ColourDesired &other) const {
        return co == other.co;
    }

    void Set(long lcol) {
        co = lcol;
    }

    void Set(unsigned int red, unsigned int green, unsigned int blue) {
        co = red | (green << 8) | (blue << 16);
    }

    static inline unsigned int ValueOfHex(const char ch) {
        if (ch >= '0' && ch <= '9')
            return ch - '0';
        else if (ch >= 'A' && ch <= 'F')
            return ch - 'A' + 10;
        else if (ch >= 'a' && ch <= 'f')
            return ch - 'a' + 10;
        else
            return 0;
    }

    void Set(const char *val) {
        if (*val == '#') {
            val++;
        }
        unsigned int r = ValueOfHex(val[0]) * 16 + ValueOfHex(val[1]);
        unsigned int g = ValueOfHex(val[2]) * 16 + ValueOfHex(val[3]);
        unsigned int b = ValueOfHex(val[4]) * 16 + ValueOfHex(val[5]);
        Set(r, g, b);
    }

    long AsLong() const {
        return co;
    }

    unsigned int GetRed() {
        return co & 0xff;
    }

    unsigned int GetGreen() {
        return (co >> 8) & 0xff;
    }

    unsigned int GetBlue() {
        return (co >> 16) & 0xff;
    }
};

/**
 * Holds an allocated RGB colour which may be an approximation to the desired colour.
 */
class ColourAllocated {
    long coAllocated;

public:

    ColourAllocated(long lcol=0) {
        coAllocated = lcol;
    }

    void Set(long lcol) {
        coAllocated = lcol;
    }

    long AsLong() const {
        return coAllocated;
    }
};

/**
 * Colour pairs hold a desired colour and an allocated colour.
 */
struct ColourPair {
    ColourDesired desired;
    ColourAllocated allocated;

    ColourPair(ColourDesired desired_=ColourDesired(0,0,0)) {
        desired = desired_;
        allocated.Set(desired.AsLong());
    }
    void Copy() {
        allocated.Set(desired.AsLong());
    }
};

class Window;   // Forward declaration for Palette

/**
 * Colour palette management.
 */
class Palette {
    int used;
    int size;
    ColourPair *entries;
#if PLAT_GTK
    void *allocatedPalette; // GdkColor *
    int allocatedLen;
#endif
    // Private so Palette objects can not be copied
    Palette(const Palette &) {}
    Palette &operator=(const Palette &) { return *this; }
public:
#if PLAT_WIN
    void *hpal;
#endif
    bool allowRealization;

    Palette();
    ~Palette();

    void Release();

    /**
     * This method either adds a colour to the list of wanted colours (want==true)
     * or retrieves the allocated colour back to the ColourPair.
     * This is one method to make it easier to keep the code for wanting and retrieving in sync.
     */
    void WantFind(ColourPair &cp, bool want);

    void Allocate(Window &w);
};

/**
 * Font management.
 */
class Font {
protected:
    FontID id;
#if PLAT_WX
    int ascent;
#endif
    // Private so Font objects can not be copied
    Font(const Font &) {}
    Font &operator=(const Font &) { id=0; return *this; }
public:
    Font();
    virtual ~Font();

    virtual void Create(const char *faceName, int characterSet, int size,
        bool bold, bool italic, bool extraFontFlag=false);
    virtual void Release();

    FontID GetID() { return id; }
    // Alias another font - caller guarantees not to Release
    void SetID(FontID id_) { id = id_; }
    friend class Surface;
        friend class SurfaceImpl;
};

/**
 * A surface abstracts a place to draw.
 */
class Surface {
private:
    // Private so Surface objects can not be copied
    Surface(const Surface &) {}
    Surface &operator=(const Surface &) { return *this; }
public:
    Surface() {};
    virtual ~Surface() {};
    static Surface *Allocate();

    virtual void Init(WindowID wid)=0;
    virtual void Init(SurfaceID sid, WindowID wid)=0;
    virtual void InitPixMap(int width, int height, Surface *surface_, WindowID wid)=0;

    virtual void Release()=0;
    virtual bool Initialised()=0;
    virtual void PenColour(ColourAllocated fore)=0;
    virtual int LogPixelsY()=0;
    virtual int DeviceHeightFont(int points)=0;
    virtual void MoveTo(int x_, int y_)=0;
    virtual void LineTo(int x_, int y_)=0;
    virtual void Polygon(Point *pts, int npts, ColourAllocated fore, ColourAllocated back)=0;
    virtual void RectangleDraw(PRectangle rc, ColourAllocated fore, ColourAllocated back)=0;
    virtual void FillRectangle(PRectangle rc, ColourAllocated back)=0;
    virtual void FillRectangle(PRectangle rc, Surface &surfacePattern)=0;
    virtual void RoundedRectangle(PRectangle rc, ColourAllocated fore, ColourAllocated back)=0;
    virtual void AlphaRectangle(PRectangle rc, int cornerSize, ColourAllocated fill, int alphaFill,
        ColourAllocated outline, int alphaOutline, int flags)=0;
    virtual void Ellipse(PRectangle rc, ColourAllocated fore, ColourAllocated back)=0;
    virtual void Copy(PRectangle rc, Point from, Surface &surfaceSource)=0;

    virtual void DrawTextNoClip(PRectangle rc, Font &font_, int ybase, const char *s, int len, ColourAllocated fore, ColourAllocated back)=0;
    virtual void DrawTextClipped(PRectangle rc, Font &font_, int ybase, const char *s, int len, ColourAllocated fore, ColourAllocated back)=0;
    virtual void DrawTextTransparent(PRectangle rc, Font &font_, int ybase, const char *s, int len, ColourAllocated fore)=0;
    virtual void MeasureWidths(Font &font_, const char *s, int len, int *positions)=0;
    virtual int WidthText(Font &font_, const char *s, int len)=0;
    virtual int WidthChar(Font &font_, char ch)=0;
    virtual int Ascent(Font &font_)=0;
    virtual int Descent(Font &font_)=0;
    virtual int InternalLeading(Font &font_)=0;
    virtual int ExternalLeading(Font &font_)=0;
    virtual int Height(Font &font_)=0;
    virtual int AverageCharWidth(Font &font_)=0;

    virtual int SetPalette(Palette *pal, bool inBackGround)=0;
    virtual void SetClip(PRectangle rc)=0;
    virtual void FlushCachedState()=0;

    virtual void SetUnicodeMode(bool unicodeMode_)=0;
    virtual void SetDBCSMode(int codePage)=0;
};

/**
 * A simple callback action passing one piece of untyped user data.
 */
typedef void (*CallBackAction)(void*);

/**
 * Class to hide the details of window manipulation.
 * Does not own the window which will normally have a longer life than this object.
 */
class Window {
protected:
    WindowID id;
public:
    Window() : id(0), cursorLast(cursorInvalid) {}
    Window(const Window &source) : id(source.id), cursorLast(cursorInvalid) {}
    virtual ~Window();
    Window &operator=(WindowID id_) {
        id = id_;
        return *this;
    }
    WindowID GetID() const { return id; }
    bool Created() const { return id != 0; }
    void Destroy();
    bool HasFocus();
    PRectangle GetPosition();
    void SetPosition(PRectangle rc);
    void SetPositionRelative(PRectangle rc, Window relativeTo);
    PRectangle GetClientPosition();
    void Show(bool show=true);
    void InvalidateAll();
    void InvalidateRectangle(PRectangle rc);
    virtual void SetFont(Font &font);
    enum Cursor { cursorInvalid, cursorText, cursorArrow, cursorUp, cursorWait, cursorHoriz, cursorVert, cursorReverseArrow, cursorHand };
    void SetCursor(Cursor curs);
    void SetTitle(const char *s);
private:
    Cursor cursorLast;
};

/**
 * Listbox management.
 */

class ListBox : public Window {
public:
    ListBox();
    virtual ~ListBox();
    static ListBox *Allocate();

    virtual void SetFont(Font &font)=0;
    virtual void Create(Window &parent, int ctrlID, Point location, int lineHeight_, bool unicodeMode_)=0;
    virtual void SetAverageCharWidth(int width)=0;
    virtual void SetVisibleRows(int rows)=0;
    virtual int GetVisibleRows() const=0;
    virtual PRectangle GetDesiredRect()=0;
    virtual int CaretFromEdge()=0;
    virtual void Clear()=0;
    virtual void Append(char *s, int type = -1)=0;
    virtual int Length()=0;
    virtual void Select(int n)=0;
    virtual int GetSelection()=0;
    virtual int Find(const char *prefix)=0;
    virtual void GetValue(int n, char *value, int len)=0;
    virtual void RegisterImage(int type, const char *xpm_data)=0;
    virtual void ClearRegisteredImages()=0;
    virtual void SetDoubleClickAction(CallBackAction, void *)=0;
    virtual void SetList(const char* list, char separator, char typesep)=0;
};

/**
 * Menu management.
 */
class Menu {
    MenuID id;
public:
    Menu();
    MenuID GetID() { return id; }
    void CreatePopUp();
    void Destroy();
    void Show(Point pt, Window &w);
};

class ElapsedTime {
    long bigBit;
    long littleBit;
public:
    ElapsedTime();
    double Duration(bool reset=false);
};

/**
 * Dynamic Library (DLL/SO/...) loading
 */
class DynamicLibrary {
public:
    virtual ~DynamicLibrary() {};

    /// @return Pointer to function "name", or NULL on failure.
    virtual Function FindFunction(const char *name) = 0;

    /// @return true if the library was loaded successfully.
    virtual bool IsValid() = 0;

    /// @return An instance of a DynamicLibrary subclass with "modulePath" loaded.
    static DynamicLibrary *Load(const char *modulePath);
};

/**
 * Platform class used to retrieve system wide parameters such as double click speed
 * and chrome colour. Not a creatable object, more of a module with several functions.
 */
class Platform {
    // Private so Platform objects can not be copied
    Platform(const Platform &) {}
    Platform &operator=(const Platform &) { return *this; }
public:
    // Should be private because no new Platforms are ever created
    // but gcc warns about this
    Platform() {}
    ~Platform() {}
    static ColourDesired Chrome();
    static ColourDesired ChromeHighlight();
    static const char *DefaultFont();
    static int DefaultFontSize();
    static unsigned int DoubleClickTime();
    static bool MouseButtonBounce();
    static void DebugDisplay(const char *s);
    static bool IsKeyDown(int key);
    static long SendScintilla(
        WindowID w, unsigned int msg, unsigned long wParam=0, long lParam=0);
    static long SendScintillaPointer(
        WindowID w, unsigned int msg, unsigned long wParam=0, void *lParam=0);
    static bool IsDBCSLeadByte(int codePage, char ch);
    static int DBCSCharLength(int codePage, const char *s);
    static int DBCSCharMaxLength();

    // These are utility functions not really tied to a platform
    static int Minimum(int a, int b);
    static int Maximum(int a, int b);
    // Next three assume 16 bit shorts and 32 bit longs
    static long LongFromTwoShorts(short a,short b) {
        return (a) | ((b) << 16);
    }
    static short HighShortFromLong(long x) {
        return static_cast<short>(x >> 16);
    }
    static short LowShortFromLong(long x) {
        return static_cast<short>(x & 0xffff);
    }
    static void DebugPrintf(const char *format, ...);
    static bool ShowAssertionPopUps(bool assertionPopUps_);
    static void Assert(const char *c, const char *file, int line);
    static int Clamp(int val, int minVal, int maxVal);
};

#ifdef  NDEBUG
#define PLATFORM_ASSERT(c) ((void)0)
#else
#define PLATFORM_ASSERT(c) ((c) ? (void)(0) : Platform::Assert(#c, __FILE__, __LINE__))
#endif

// Shut up annoying Visual C++ warnings:
#ifdef _MSC_VER
#pragma warning(disable: 4244 4309 4514 4710)
#endif

#endif
