#include <stdio.h>

#include "snes9x.h"
#include "soundux.h"
#include "memmap.h"
#include "apu.h"
#include "cheats.h"
#include "snapshot.h"
#include "display.h"
#include "gfx.h"
#include "cpuexec.h"
#include "spc7110.h"

#ifdef PSP
#include <psptypes.h>
#else
#ifndef PSP_LEGACY_TYPES_DEFINED
#define PSP_LEGACY_TYPES_DEFINED
typedef	uint8_t				u8;
typedef uint16_t			u16;

typedef uint32_t			u32;
typedef uint64_t			u64;

typedef int8_t				s8;
typedef int16_t				s16;

typedef int32_t				s32;
typedef int64_t				s64;
#endif
#endif

#include <libretro.h>

static retro_log_printf_t log_cb = NULL;
static retro_video_refresh_t video_cb = NULL;
static retro_input_poll_t poll_cb = NULL;
static retro_input_state_t input_cb = NULL;
static retro_audio_sample_batch_t audio_batch_cb = NULL;
static retro_environment_t environ_cb = NULL;


struct retro_perf_callback perf_cb;

void retro_set_environment(retro_environment_t cb)
{
   struct retro_log_callback log;

   environ_cb = cb;

   if (environ_cb(RETRO_ENVIRONMENT_GET_LOG_INTERFACE, &log))
      log_cb = log.log;
   else
      log_cb = NULL;

   environ_cb(RETRO_ENVIRONMENT_GET_PERF_INTERFACE, &perf_cb);

}


void retro_set_video_refresh(retro_video_refresh_t cb)
{
   video_cb = cb;
}

void retro_set_audio_sample(retro_audio_sample_t cb)
{}

void retro_set_audio_sample_batch(retro_audio_sample_batch_t cb)
{
   audio_batch_cb = cb;
}

void retro_set_input_poll(retro_input_poll_t cb)
{
   poll_cb = cb;
}

void retro_set_input_state(retro_input_state_t cb)
{
   input_cb = cb;
}

void retro_set_controller_port_device(unsigned port, unsigned device) {}

unsigned retro_api_version() { return RETRO_API_VERSION; }



void S9xProcessSound (unsigned int);

char *rom_filename = NULL;
char *SDD1_pack = NULL;

/*
 * It is only safe to manipulate saved states between frames.
 */
static bool8 LoadStateNeeded = FALSE;
static bool8 SaveStateNeeded = FALSE;

static u8 Buf[MAX_BUFFER_SIZE];

#define FIXED_POINT 0x10000
#define FIXED_POINT_SHIFT 16
#define FIXED_POINT_REMAINDER 0xffff

void S9xMessage (int /*type*/, int /*number*/, const char *message)
{
#if 1
#define MAX_MESSAGE_LEN (36 * 3)

    static char buffer [MAX_MESSAGE_LEN + 1];

    printf ("%s\n", message);
    strncpy (buffer, message, MAX_MESSAGE_LEN);
    buffer [MAX_MESSAGE_LEN] = 0;
    S9xSetInfoString (buffer);
#endif
}

void S9xExtraUsage ()
{
    /*empty*/
}

/*
*   Release display device
*/
void S9xDeinitDisplay (void)
{
#ifdef DS2_DMA
    if(GFX.Screen) AlignedFree(GFX.Screen, PtrAdj.GFXScreen);
#else
    if(GFX.Screen) free(GFX.Screen);
#endif
    if(GFX.SubScreen) free(GFX.SubScreen);
    if(GFX.ZBuffer) free(GFX.ZBuffer);
    if(GFX.SubZBuffer) free(GFX.SubZBuffer);
}

void S9xInitDisplay (void)
{
    int h = IMAGE_HEIGHT;

   GFX.Pitch = IMAGE_WIDTH * 2;
#ifdef DS2_DMA
   GFX.Screen =    (unsigned char*) AlignedMalloc (GFX.Pitch * h, 32, &PtrAdj.GFXScreen);
#else
   GFX.Screen =	(unsigned char*) malloc (GFX.Pitch * h);
#endif
   GFX.SubScreen = (unsigned char*) malloc (GFX.Pitch * h);
   GFX.ZBuffer = 	(unsigned char*) malloc ((GFX.Pitch >> 1) * h);
   GFX.SubZBuffer =(unsigned char*) malloc ((GFX.Pitch >> 1) * h);
   GFX.Delta = (GFX.SubScreen - GFX.Screen) >> 1;
}

void S9xParseArg (char **argv, int &i, int argc)
{
}

void S9xParseDisplayArg (char **argv, int &ind, int)
{
}

void S9xExit ()
{
//  if(Settings.SPC7110)
//    (*CleanUp7110)();

//   S9xSetSoundMute (TRUE);
//    S9xDeinitDisplay ();
//    Memory.SaveSRAM (S9xGetFilename (".srm"));
//    // S9xSaveCheatFile (S9xGetFilename (".chb")); // cheat binary file
//   // Do this when loading a cheat file!
//    Memory.Deinit ();
//    S9xDeinitAPU ();

//   exit(0);
}

const char *S9xBasename (const char *f)
{
    const char *p;
    if ((p = strrchr (f, '/')) != NULL || (p = strrchr (f, '\\')) != NULL)
   return (p + 1);

    return (f);
}

bool8 S9xInitUpdate ()
{
//   IPPU.RenderThisFrame = 0;
//   video_cb(dummy_frame,256,224,512);
//   return (FALSE);

    return (TRUE);
}


extern void NDSSFCDrawFrameAntialiased(void* screen_addr);

#ifdef PSP
#include <pspkernel.h>
#include <pspgu.h>
void S9xDeinitUpdate (int width, int height, bool8 /*sixteen_bit*/)
{
   static unsigned int __attribute__((aligned(16))) d_list[32];
   void* const texture_vram_p = (void*) (0x44200000 - (512 * 512)); // max VRAM address - frame size

   sceKernelDcacheWritebackRange(GFX.Screen, GFX.Pitch*height);

   sceGuStart(GU_DIRECT, d_list);

   sceGuCopyImage(GU_PSM_4444, 0, 0, width, height, GFX.Pitch>>1, GFX.Screen, 0, 0, 512, texture_vram_p);

   sceGuTexSync();
   sceGuTexImage(0, 512, 512, 512, texture_vram_p);
   sceGuTexMode(GU_PSM_5551, 0, 0, GU_FALSE);
   sceGuTexFunc(GU_TFX_REPLACE, GU_TCC_RGB);
   sceGuDisable(GU_BLEND);

   sceGuFinish();


   video_cb(texture_vram_p, width, height, GFX.Pitch);
}

#else
void S9xDeinitUpdate (int width, int height)
{
   video_cb(GFX.Screen, width, height, GFX.Pitch);
}

#endif

void _makepath (char *path, const char *, const char *dir,
      const char *fname, const char *ext)
{
    if (dir && *dir)
    {
   strcpy (path, dir);
   strcat (path, "/");
    }
    else
   *path = 0;
    strcat (path, fname);
    if (ext && *ext)
    {
        strcat (path, ".");
        strcat (path, ext);
    }
}

void _splitpath (const char *path, char *drive, char *dir, char *fname,
       char *ext)
{
    *drive = 0;

    char *slash = strrchr ((char*)path, '/');
    if (!slash)
   slash = strrchr ((char*)path, '\\');

    char *dot = strrchr ((char*)path, '.');

    if (dot && slash && dot < slash)
   dot = NULL;

    if (!slash)
    {
   strcpy (dir, "");
   strcpy (fname, path);
        if (dot)
        {
       *(fname + (dot - path)) = 0;
       strcpy (ext, dot + 1);
        }
   else
       strcpy (ext, "");
    }
    else
    {
   strcpy (dir, path);
   *(dir + (slash - path)) = 0;
   strcpy (fname, slash + 1);
        if (dot)
   {
       *(fname + (dot - slash) - 1) = 0;
          strcpy (ext, dot + 1);
   }
   else
       strcpy (ext, "");
    }
}

void S9xProcessEvents (bool8 block)
{

}

void OutOfMemory ()
{
}


const char *S9xGetROMDirectory ()
{
   return "./";
}


const char *S9xGetSnapshotDirectory ()
{
    return "./";
}

const char *S9xGetFilename (const char *ex)
{
    static char filename [PATH_MAX + 1];
    char drive [_MAX_DRIVE + 1];
    char dir [_MAX_DIR + 1];
    char fname [_MAX_FNAME + 1];
    char ext [_MAX_EXT + 1];

    _splitpath (Memory.ROMFilename, drive, dir, fname, ext);
    strcpy (filename, S9xGetSnapshotDirectory ());
    strcat (filename, SLASH_STR);
    strcat (filename, fname);
    strcat (filename, ex);

    return (filename);
}

const char *S9xGetFilenameInc (const char *e)
{
    return e;
#if 0
    static char filename [_MAX_PATH + 1];
    char drive [_MAX_DRIVE + 1];
    char dir [_MAX_DIR + 1];
    char fname [_MAX_FNAME + 1];
    char ext [_MAX_EXT + 1];
    char *ptr;
    struct stat buf;

    if (strlen (S9xGetSnapshotDirectory()))
    {
        _splitpath (Memory.ROMFilename, drive, dir, fname, ext);
        strcpy (filename, S9xGetSnapshotDirectory());
        strcat (filename, "/");
        strcat (filename, fname);
        ptr = filename + strlen (filename);
        strcat (filename, "00/");
        strcat (filename, e);
    }
    else
    {
        _splitpath (Memory.ROMFilename, drive, dir, fname, ext);
        strcat (fname, "00/");
        _makepath (filename, drive, dir, fname, e);
        ptr = strstr (filename, "00/");
    }

    do
    {
        if (++*(ptr + 2) > '9')
        {
            *(ptr + 2) = '0';
            if (++*(ptr + 1) > '9')
            {
                *(ptr + 1) = '0';
                if (++*ptr > '9')
                    break;
            }
        }
    } while( stat(filename, &buf) == 0 );

    return (filename);
#endif
}

void S9xInitInputDevices ()
{
#ifdef JOYSTICK_SUPPORT
    InitJoysticks ();
#endif
}


void init_sfc_setting(void)
{
    ZeroMemory (&Settings, sizeof (Settings));
#ifdef JOYSTICK_SUPPORT
    Settings.JoystickEnabled = TRUE;
#else
    Settings.JoystickEnabled = FALSE;
#endif

    Settings.SoundPlaybackRate = 44100;	// -> ds2sound.h for defs
    Settings.SoundBufferSize = 512;
    Settings.CyclesPercentage = 100;
    Settings.DisableSoundEcho = FALSE;
   //sound settings
    Settings.APUEnabled = Settings.NextAPUEnabled = TRUE;
   // Settings.FixFrequency = 1;

    Settings.H_Max = SNES_CYCLES_PER_SCANLINE;
    Settings.SkipFrames = AUTO_FRAMERATE;
    Settings.ShutdownMaster = TRUE;
    Settings.FrameTimePAL = 20000;
    Settings.FrameTimeNTSC = 16667;
    Settings.DisableMasterVolume = FALSE;
    Settings.Mouse = TRUE;
    Settings.SuperScope = TRUE;
    Settings.MultiPlayer5 = TRUE;
    Settings.ControllerOption = SNES_JOYPAD;

    Settings.Transparency = TRUE;
    Settings.SupportHiRes = FALSE;
    Settings.ThreadSound = FALSE;
    Settings.SoundSync = TRUE;
    Settings.ApplyCheats = TRUE;
    Settings.StretchScreenshots = 1;

   Settings.HBlankStart = (256 * Settings.H_Max) / SNES_HCOUNTER_MAX;
}

void S9xAutoSaveSRAM ()
{
    Memory.SaveSRAM (S9xGetFilename (".srm"));
}

int game_load_state(char* file)
{
   int flag;

   flag = 0;
   if(S9xUnfreezeGame(file) == FALSE)
      flag = -1;

   return flag;
}

int game_save_state(char* file)
{
   int flag;

   flag = 0;
   if(S9xFreezeGame(file) == FALSE)
      flag = -1;

   S9xAutoSaveSRAM ();

   return flag;
}

void game_restart(void)
{
   CPU.Flags = 0;
   S9xReset ();
}

int load_gamepak(const char* file)
{
   CPU.Flags = 0;
   // mdelay(50); // Delete this delay
   if (!Memory.LoadROM (file))
      return -1;
   S9xReset ();

   Settings.FrameTime = (Settings.PAL ? Settings.FrameTimePAL : Settings.FrameTimeNTSC);

   Memory.LoadSRAM (S9xGetFilename (".srm"));
   S9xLoadCheatFile (S9xGetFilename (".chb")); // cheat binary file, as opposed to text

   return 0;
}

void sfc_main(void);

void retro_init (void)
{
   struct retro_log_callback log;
   enum retro_pixel_format rgb565;

   if (environ_cb(RETRO_ENVIRONMENT_GET_LOG_INTERFACE, &log))
      log_cb = log.log;
   else
      log_cb = NULL;

   rgb565 = RETRO_PIXEL_FORMAT_RGB565;
   if(environ_cb(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &rgb565) && log_cb)
         log_cb(RETRO_LOG_INFO, "Frontend supports RGB565 - will use that instead of XRGB1555.\n");

   init_sfc_setting();

    if (!Memory.Init () || !S9xInitAPU())
      OutOfMemory ();

   S9xInitDisplay ();
    if (!S9xGraphicsInit())
      OutOfMemory ();

    S9xInitSound (Settings.SoundPlaybackRate,
                  TRUE,
                  Settings.SoundBufferSize);

#ifdef JOYSTICK_SUPPORT
    uint32 JoypadSkip = 0;
#endif


}


uint32 S9xReadJoypad (int port)
{
   static const uint32 snes_lut[] = {
   SNES_B_MASK,
   SNES_Y_MASK,
   SNES_SELECT_MASK,
   SNES_START_MASK,
   SNES_UP_MASK,
   SNES_DOWN_MASK,
   SNES_LEFT_MASK,
   SNES_RIGHT_MASK,
   SNES_A_MASK,
   SNES_X_MASK,
   SNES_TL_MASK,
   SNES_TR_MASK
   };

   int i;
   uint32 joypad = 0;

   for ( i = RETRO_DEVICE_ID_JOYPAD_B; i <= RETRO_DEVICE_ID_JOYPAD_R; i++)
      if (input_cb(port, RETRO_DEVICE_JOYPAD, 0, i))
         joypad |= snes_lut[i];

   return joypad;
}

//#define FRAMESKIP
void retro_run (void)
{
   int i, port;

//   IPPU.RenderThisFrame = FALSE;
//   video_cb(GFX.Screen, 256, 224, 512);

   poll_cb();

   S9xSetPlaybackRate(32040);
   so.mute_sound = FALSE;
   SoundData.echo_enable = FALSE;

   S9xMainLoop();

   static s16 audio_buf[534 << 1];
   S9xMixSamples ((uint8*)audio_buf, 534 << 1);
   audio_batch_cb(audio_buf, 534);


#ifdef FRAMESKIP
   if (IPPU.RenderThisFrame)
      IPPU.RenderThisFrame = false;
   else
   {
      video_cb(NULL, 256, 224, GFX.Pitch);
      IPPU.RenderThisFrame = true;
   }
#endif

//   if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated)
//      check_variables();

}


static unsigned int sync_last= 0;
static unsigned int sync_next = 0;

static unsigned int skip_rate= 0;

void S9xSyncSpeed ()
{
}

bool8 S9xOpenSoundDevice (int mode, bool8 stereo, int buffer_size)
{
    return (TRUE);
}

void S9xGenerateSound ()
{
//   static s16 audio_buf[855 << 1];
//   S9xMixSamples ((uint8*)audio_buf, 855 << 1);
//   audio_batch_cb(audio_buf, 855);



}

void S9xGenerateSound0 ()
{
   int bytes_so_far = so.samples_mixed_so_far << 1;

   if (bytes_so_far >= so.buffer_size)
      return;

   so.err_counter += so.err_rate;
   if (so.err_counter >= FIXED_POINT)
   {
      // Write this many samples overall
      int samples_to_write = so.err_counter >> FIXED_POINT_SHIFT;
      samples_to_write <<= 1;
      int byte_offset = (bytes_so_far + so.play_position) & SOUND_BUFFER_SIZE_MASK;

      so.err_counter &= FIXED_POINT_REMAINDER;

      do
      {
         int bytes_this_run = samples_to_write;
         bytes_this_run <<= 1;

         if (byte_offset + bytes_this_run > SOUND_BUFFER_SIZE)
         {
            bytes_this_run = SOUND_BUFFER_SIZE - byte_offset;
         }

         if (bytes_so_far + bytes_this_run > so.buffer_size)
         {
            bytes_this_run = so.buffer_size - bytes_so_far;
            if (bytes_this_run == 0)
               break;
         }

         int samples_this_run = bytes_this_run;
         samples_this_run >>= 1;

         S9xMixSamples (Buf + byte_offset, samples_this_run);
         so.samples_mixed_so_far += samples_this_run;
         samples_to_write -= samples_this_run;
         bytes_so_far += samples_this_run << 1;
         byte_offset = (byte_offset + bytes_this_run) & SOUND_BUFFER_SIZE_MASK;
      } while (samples_to_write > 0);
   }
}

#define SOUND_EMISSION_INTERVAL ((unsigned int) ((((unsigned long long) DS2_BUFFER_SIZE * 1000000) / SND_SAMPLE_RATE) * 3 / 128))
#define TRUE_SOUND_EMISSION_INTERVAL ((((double) DS2_BUFFER_SIZE * 1000000) / SND_SAMPLE_RATE) * 3 / 128)
#define SOUND_EMISSION_INTERVAL_ERROR ((int) ((TRUE_SOUND_EMISSION_INTERVAL - SOUND_EMISSION_INTERVAL) * FIXED_POINT))
static unsigned int LastSoundEmissionTime = 0;

/*
 * Accumulated error in the sound emission time. The unit is as follows:
 * FIXED_POINT = 42.667 microseconds.
 * As the error goes past FIXED_POINT, the new target for sound emission
 * becomes 42.667 microseconds LATER. This helps with sound buffer overruns,
 * correctly dealing with the fact that 42.667 microseconds does not fit
 * an integer number of times in 1/32000 second (or whatever sampling rate).
 */
static unsigned int SoundEmissionTimeError = 0;

void S9xProcessSound (unsigned int)
{

}

/*
const unsigned int keymap[12] = {
      0x80,		//KEY_A
      0x8000,		//KEY_B
      0x2000,		//KEY_SELECT
      0x1000,		//KEY_START
      0x100,		//KEY_RIGHT
      0x200,		//KEY_LEFT
      0x800,		//KEY_UP
      0x400,		//KEY_DOWN
      0x10,		//KEY_R
      0x20,		//KEY_L
      0x40,		//KEY_X
      0x4000		//KEY_Y
   };
*/

static bool8 SoundToggleWasHeld = FALSE;
static bool8 LoadStateWasHeld = FALSE;
static bool8 SaveStateWasHeld = FALSE;
static bool8 ToggleFullScreenWasHeld = FALSE;

#ifdef ACCUMULATE_JOYPAD
// These are kept as DS key bitfields until it's time to send them to Snes9x.
static uint32 PreviousControls = 0x00000000;
static uint32 ControlsPressed  = 0x00000000;
static uint32 ControlsReleased = 0x00000000;

void NDSSFCAccumulateJoypad ()
{
   struct key_buf inputdata;
   ds2_getrawInput(&inputdata);

   ControlsPressed |= inputdata.key & ~PreviousControls;
   ControlsReleased |= PreviousControls & ~inputdata.key;
}
#endif // ACCUMULATE_JOYPAD

static int S9xCompareSDD1IndexEntries (const void *p1, const void *p2)
{
    return (*(uint32 *) p1 - *(uint32 *) p2);
}

void S9xLoadSDD1Data ()
{

}

bool8 S9xReadMousePosition (int which1, int &x, int &y, uint32 &buttons)
{
    return (FALSE);
}

bool8 S9xReadSuperScopePosition (int &x, int &y, uint32 &buttons)
{
    return (TRUE);
}

bool JustifierOffscreen()
{
    return (FALSE);
}

void JustifierButtons(uint32* justifiers)
{
}

char* osd_GetPackDir()
{
  static char filename[_MAX_PATH];
  memset(filename, 0, _MAX_PATH);

  if(strlen(S9xGetSnapshotDirectory())!=0)
    strcpy (filename, S9xGetSnapshotDirectory());
  else
  {
    char dir [_MAX_DIR + 1];
    char drive [_MAX_DRIVE + 1];
    char name [_MAX_FNAME + 1];
    char ext [_MAX_EXT + 1];
    _splitpath(Memory.ROMFilename, drive, dir, name, ext);
    _makepath(filename, drive, dir, NULL, NULL);
  }

  if(!strncmp((char*)&Memory.ROM [0xffc0], "SUPER POWER LEAG 4   ", 21))
  {
    if (getenv("SPL4PACK"))
      return getenv("SPL4PACK");
    else
      strcat(filename, "/SPL4-SP7");
  }
  else if(!strncmp((char*)&Memory.ROM [0xffc0], "MOMOTETSU HAPPY      ",21))
  {
    if (getenv("MDHPACK"))
      return getenv("MDHPACK");
    else
      strcat(filename, "/SMHT-SP7");
  }
  else if(!strncmp((char*)&Memory.ROM [0xffc0], "HU TENGAI MAKYO ZERO ", 21))
  {
    if (getenv("FEOEZPACK"))
      return getenv("FEOEZPACK");
    else
      strcat(filename, "/FEOEZSP7");
  }
  else if(!strncmp((char*)&Memory.ROM [0xffc0], "JUMP TENGAIMAKYO ZERO",21))
  {
    if (getenv("SJNSPACK"))
      return getenv("SJNSPACK");
    else
      strcat(filename, "/SJUMPSP7");
  } else strcat(filename, "/MISC-SP7");
  return filename;
}

void retro_deinit (void)
{
}
unsigned retro_get_region (void)
{
   return Settings.PAL ? RETRO_REGION_PAL : RETRO_REGION_NTSC;
}
void retro_get_system_info(struct retro_system_info *info)
{
   info->need_fullpath = true;
   info->valid_extensions = "smc|fig|sfc|gd3|gd7|dx2|bsx|swc";
   info->library_version = "v1.4";
   info->library_name = "SNES9x(CATSFC)";
   info->block_extract = false;
}
void retro_get_system_av_info(struct retro_system_av_info *info)
{
   info->geometry.base_width = 256;
   info->geometry.base_height = 224;
   info->geometry.max_width = 512;
   info->geometry.max_height = 512;
   info->geometry.aspect_ratio = 4.0 / 3.0;
//   if (!Settings.PAL)
//      info->timing.fps = 21477272.0 / 357366.0;
//   else
//      info->timing.fps = 21281370.0 / 425568.0;
//   info->timing.sample_rate = 32040.5;


   info->timing.fps = 60.0;
   info->timing.sample_rate = 32040.0;
}

void retro_reset(void)
{

}


size_t retro_serialize_size(void)
{
   return 0;
}

bool retro_serialize(void *data, size_t size)
{   
   return false;
}
bool retro_unserialize(const void *data, size_t size)
{
   return false;
}

void retro_cheat_reset(void)
{

}
void retro_cheat_set(unsigned index, bool enabled, const char *code)
{

}

bool retro_load_game(const struct retro_game_info *game)

{
   Memory.LoadROM(game->path);
   return true;
}

bool retro_load_game_special(
  unsigned game_type,
  const struct retro_game_info *info, size_t num_info
)
{
   return false;
}
void retro_unload_game(void)
{

}

void *retro_get_memory_data(unsigned id)
{
   return NULL;
}

size_t retro_get_memory_size(unsigned id)
{
   return 0;
}