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/* ScummVM - Graphic Adventure Engine
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * $URL: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-1-0-0/backends/platform/iphone/osys_main.h $
 * $Id: osys_main.h 42479 2009-07-14 13:52:11Z vinterstum $

#include "graphics/surface.h"
#include "iphone_common.h"
#include "backends/base-backend.h"
#include "common/events.h"
#include "sound/mixer_intern.h"
#include "backends/fs/posix/posix-fs-factory.h"
#include "graphics/colormasks.h"

#include <AudioToolbox/AudioQueue.h>

#define WAVE_BUFFER_SIZE 2048
#define AUDIO_SAMPLE_RATE 44100

#define SCUMMVM_ROOT_PATH "/var/mobile/Library/ScummVM"

typedef void (*SoundProc)(void *param, byte *buf, int len);
typedef int (*TimerProc)(int interval);

typedef struct AQCallbackStruct {
    AudioQueueRef queue;
    uint32 frameCount;
    AudioQueueBufferRef buffers[AUDIO_BUFFERS];
    AudioStreamBasicDescription dataFormat;
} AQCallbackStruct;

class OSystem_IPHONE : public BaseBackend {

      static const OSystem::GraphicsMode s_supportedGraphicsModes[];
      static AQCallbackStruct s_AudioQueue;
      static SoundProc s_soundCallback;
      static void *s_soundParam;

      Common::SaveFileManager *_savefile;
      Audio::MixerImpl *_mixer;
      Common::TimerManager *_timer;

      Graphics::Surface _framebuffer;
      byte *_offscreen;
      OverlayColor  *_overlayBuffer;
      uint16 *_fullscreen;

      uint16  _palette[256];
      bool _overlayVisible;
      uint16 _screenWidth;
      uint16 _screenHeight;

      struct timeval _startTime;
      uint32 _timeSuspended;

      bool _mouseVisible;
      byte *_mouseBuf;
      byte _mouseKeyColour;
      uint _mouseWidth, _mouseHeight;
      uint _mouseX, _mouseY;
      int _mouseHotspotX, _mouseHotspotY;
      bool _mouseDirty;
      long _lastMouseDown;
      long _lastMouseTap;
      Common::Rect _lastDrawnMouseRect;
      Common::Event _queuedInputEvent;
      bool _needEventRestPeriod;
      bool _secondaryTapped;
      long _lastSecondaryDown;
      long _lastSecondaryTap;
      int _gestureStartX, _gestureStartY;
      bool _mouseClickAndDragEnabled;
      bool _touchpadModeEnabled;
      int _lastPadX;
      int _lastPadY;
      int _lastDragPosX;
      int _lastDragPosY;

      int _timerCallbackNext;
      int _timerCallbackTimer;
      TimerProc _timerCallback;

      Common::Array<Common::Rect> _dirtyRects;
      Common::Array<Common::Rect> _dirtyOverlayRects;
      ScreenOrientation _screenOrientation;
      bool _fullScreenIsDirty;
      bool _fullScreenOverlayIsDirty;
      int _screenChangeCount;
      FilesystemFactory *_fsFactory;


      virtual ~OSystem_IPHONE();

      virtual void initBackend();

      virtual bool hasFeature(Feature f);
      virtual void setFeatureState(Feature f, bool enable);
      virtual bool getFeatureState(Feature f);
      virtual const GraphicsMode *getSupportedGraphicsModes() const;
      virtual int getDefaultGraphicsMode() const;
      bool setGraphicsMode(const char *name);
      virtual bool setGraphicsMode(int mode);
      virtual int getGraphicsMode() const;
      virtual void initSize(uint width, uint height);
      virtual int16 getHeight();
      virtual int16 getWidth();
      virtual void setPalette(const byte *colors, uint start, uint num);
      virtual void grabPalette(byte *colors, uint start, uint num);
      virtual void copyRectToScreen(const byte *buf, int pitch, int x, int y, int w, int h);
      virtual void updateScreen();
      virtual Graphics::Surface *lockScreen();
      virtual void unlockScreen();
      virtual void setShakePos(int shakeOffset);

      virtual void showOverlay();
      virtual void hideOverlay();
      virtual void clearOverlay();
      virtual void grabOverlay(OverlayColor *buf, int pitch);
      virtual void copyRectToOverlay(const OverlayColor *buf, int pitch, int x, int y, int w, int h);
      virtual int16 getOverlayHeight();
      virtual int16 getOverlayWidth();
      virtual Graphics::PixelFormat getOverlayFormat() const { return Graphics::createPixelFormat<565>(); }

      virtual bool showMouse(bool visible);

      virtual void warpMouse(int x, int y);
      virtual void setMouseCursor(const byte *buf, uint w, uint h, int hotspotX, int hotspotY, byte keycolor = 255, int cursorTargetScale = 1);

      virtual bool pollEvent(Common::Event &event);
      virtual uint32 getMillis();
      virtual void delayMillis(uint msecs);

      virtual MutexRef createMutex(void);
      virtual void lockMutex(MutexRef mutex);
      virtual void unlockMutex(MutexRef mutex);
      virtual void deleteMutex(MutexRef mutex);

      static void mixCallback(void *sys, byte *samples, int len);
      virtual void setupMixer(void);
      virtual int getOutputSampleRate() const;
      virtual void setTimerCallback(TimerProc callback, int interval);
      virtual int getScreenChangeID() const { return _screenChangeCount; }
      virtual void quit();

      FilesystemFactory *getFilesystemFactory() { return _fsFactory; }
      virtual void addSysArchivesToSearchSet(Common::SearchSet &s, int priority = 0);
      virtual void getTimeAndDate(struct tm &t) const;

      virtual Common::SaveFileManager *getSavefileManager();
      virtual Audio::Mixer *getMixer();
      virtual Common::TimerManager *getTimerManager();

      void startSoundsystem();
      void stopSoundsystem();

      virtual Common::SeekableReadStream *createConfigReadStream();
      virtual Common::WriteStream *createConfigWriteStream();

      void internUpdateScreen();
      void dirtyFullScreen();
      void dirtyFullOverlayScreen();
      void clipRectToScreen(int16 &x, int16 &y, int16 &w, int16 &h);
      void suspendLoop();
      void drawDirtyRect(const Common::Rect& dirtyRect);
      void drawDirtyOverlayRect(const Common::Rect& dirtyRect);
      void drawMouseCursorOnRectUpdate(const Common::Rect& updatedRect, const Common::Rect& mouseRect);
      void updateHardwareSurfaceForRect(const Common::Rect& updatedRect);
      static void AQBufferCallback(void *in, AudioQueueRef inQ, AudioQueueBufferRef outQB);
      static int timerHandler(int t);

      bool handleEvent_swipe(Common::Event &event, int direction);
      void handleEvent_keyPressed(Common::Event &event, int keyPressed);
      void handleEvent_orientationChanged(int orientation);

      bool handleEvent_mouseDown(Common::Event &event, int x, int y);
      bool handleEvent_mouseUp(Common::Event &event, int x, int y);

      bool handleEvent_secondMouseDown(Common::Event &event, int x, int y);
      bool handleEvent_secondMouseUp(Common::Event &event, int x, int y);

      bool handleEvent_mouseDragged(Common::Event &event, int x, int y);
      bool handleEvent_mouseSecondDragged(Common::Event &event, int x, int y);

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