/*
Copyright (C) 1996-1997 Id Software, Inc.

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
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  

See the 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
// Quake is a trademark of Id Software, Inc., (c) 1996 Id Software, Inc. All
// rights reserved.

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/file.h>
#include <sys/types.h>
#include <fcntl.h>
#include <string.h>
#include <time.h>
#include <errno.h>

#include <linux/cdrom.h>

#include "quakedef.h"

static qboolean cdValid = false;
static qboolean	playing = false;
static qboolean	wasPlaying = false;
static qboolean	initialized = false;
static qboolean	enabled = true;
static qboolean playLooping = false;
static float	cdvolume;
static byte 	remap[100];
static byte		playTrack;
static byte		maxTrack;

static int cdfile = -1;
static char cd_dev[64] = "/dev/cdrom";

static void CDAudio_Eject(void)
{
	if (cdfile == -1 || !enabled)
		return; // no cd init'd

	if ( ioctl(cdfile, CDROMEJECT) == -1 ) 
		Con_DPrintf("ioctl cdromeject failed\n");
}


static void CDAudio_CloseDoor(void)
{
	if (cdfile == -1 || !enabled)
		return; // no cd init'd

	if ( ioctl(cdfile, CDROMCLOSETRAY) == -1 ) 
		Con_DPrintf("ioctl cdromclosetray failed\n");
}

static int CDAudio_GetAudioDiskInfo(void)
{
	struct cdrom_tochdr tochdr;

	cdValid = false;

	if ( ioctl(cdfile, CDROMREADTOCHDR, &tochdr) == -1 ) 
    {
      Con_DPrintf("ioctl cdromreadtochdr failed\n");
	  return -1;
    }

	if (tochdr.cdth_trk0 < 1)
	{
		Con_DPrintf("CDAudio: no music tracks\n");
		return -1;
	}

	cdValid = true;
	maxTrack = tochdr.cdth_trk1;

	return 0;
}


void CDAudio_Play(byte track, qboolean looping)
{
	struct cdrom_tocentry entry;
	struct cdrom_ti ti;

	if (cdfile == -1 || !enabled)
		return;
	
	if (!cdValid)
	{
		CDAudio_GetAudioDiskInfo();
		if (!cdValid)
			return;
	}

	track = remap[track];

	if (track < 1 || track > maxTrack)
	{
		Con_DPrintf("CDAudio: Bad track number %u.\n", track);
		return;
	}

	// don't try to play a non-audio track
	entry.cdte_track = track;
	entry.cdte_format = CDROM_MSF;
    if ( ioctl(cdfile, CDROMREADTOCENTRY, &entry) == -1 )
	{
		Con_DPrintf("ioctl cdromreadtocentry failed\n");
		return;
	}
	if (entry.cdte_ctrl == CDROM_DATA_TRACK)
	{
		Con_Printf("CDAudio: track %i is not audio\n", track);
		return;
	}

	if (playing)
	{
		if (playTrack == track)
			return;
		CDAudio_Stop();
	}

	ti.cdti_trk0 = track;
	ti.cdti_trk1 = track;
	ti.cdti_ind0 = 1;
	ti.cdti_ind1 = 99;

	if ( ioctl(cdfile, CDROMPLAYTRKIND, &ti) == -1 ) 
    {
		Con_DPrintf("ioctl cdromplaytrkind failed\n");
		return;
    }

	if ( ioctl(cdfile, CDROMRESUME) == -1 ) 
		Con_DPrintf("ioctl cdromresume failed\n");

	playLooping = looping;
	playTrack = track;
	playing = true;

	if (cdvolume == 0.0)
		CDAudio_Pause ();
}

void CDAudio_RandomPlay(void)
{
  int track, i = 0, free_tracks = 0, remap_track;
  float f;
  byte* track_bools;
  struct cdrom_tocentry entry;
  struct cdrom_ti ti;

  if (cdfile == -1 || !enabled)
    return;

  track_bools = (byte*)malloc(maxTrack * sizeof(byte));

  if (track_bools == 0)
    return;

  //create array of available audio tracknumbers

  for (; i < maxTrack; i++)
    {
	entry.cdte_track = remap[i];
	entry.cdte_format = CDROM_LBA;
	if ( ioctl(cdfile, CDROMREADTOCENTRY, &entry) == -1 )
	{
	  track_bools[i] = 0;
	}
	else 
	  track_bools[i] = (entry.cdte_ctrl != CDROM_DATA_TRACK);
	
	free_tracks += track_bools[i];
    }

  if (!free_tracks)
    {
      Con_DPrintf("CDAudio_RandomPlay: Unable to find and play a random audio track, insert an audio cd please");
      goto free_end;
    }

  //choose random audio track
  do
    {
      do
	{
	  f = ((float)rand()) / ((float)RAND_MAX + 1.0);
	  track = (int)(maxTrack  * f);
	}
      while(!track_bools[track]);
      
      remap_track = remap[track];

      if (playing)
	{
	  if (playTrack == remap_track)
	    {
	      goto free_end;
	    }
	  CDAudio_Stop();
	}
	
      ti.cdti_trk0 = remap_track;
      ti.cdti_trk1 = remap_track;
      ti.cdti_ind0 = 0;
      ti.cdti_ind1 = 0;

      if ( ioctl(cdfile, CDROMPLAYTRKIND, &ti) == -1 ) 
	{
	  track_bools[track] = 0;
	  free_tracks--;
	}
      else
	{
	  playLooping = true;
	  playTrack = remap_track;
	  playing = true;
	  break;
	}
    }
  while (free_tracks > 0);

 free_end:
    free((void*)track_bools);
}



void CDAudio_Stop(void)
{
	if (cdfile == -1 || !enabled)
		return;
	
	if (!playing)
		return;

	if ( ioctl(cdfile, CDROMSTOP) == -1 )
		Con_DPrintf("ioctl cdromstop failed (%d)\n", errno);

	wasPlaying = false;
	playing = false;
}

void CDAudio_Pause(void)
{
	if (cdfile == -1 || !enabled)
		return;

	if (!playing)
		return;

	if ( ioctl(cdfile, CDROMPAUSE) == -1 ) 
		Con_DPrintf("ioctl cdrompause failed\n");

	wasPlaying = playing;
	playing = false;
}


void CDAudio_Resume(void)
{
	if (cdfile == -1 || !enabled)
		return;
	
	if (!cdValid)
		return;

	if (!wasPlaying)
		return;
	
	if ( ioctl(cdfile, CDROMRESUME) == -1 ) 
		Con_DPrintf("ioctl cdromresume failed\n");
	playing = true;
}

static void CD_f (void)
{
	char	*command;
	int		ret;
	int		n;

	if (Cmd_Argc() < 2)
		return;

	command = Cmd_Argv (1);

	if (Q_strcasecmp(command, "on") == 0)
	{
		enabled = true;
		return;
	}

	if (Q_strcasecmp(command, "off") == 0)
	{
		if (playing)
			CDAudio_Stop();
		enabled = false;
		return;
	}

	if (Q_strcasecmp(command, "reset") == 0)
	{
		enabled = true;
		if (playing)
			CDAudio_Stop();
		for (n = 0; n < 100; n++)
			remap[n] = n;
		CDAudio_GetAudioDiskInfo();
		return;
	}

	if (Q_strcasecmp(command, "remap") == 0)
	{
		ret = Cmd_Argc() - 2;
		if (ret <= 0)
		{
			for (n = 1; n < 100; n++)
				if (remap[n] != n)
					Con_Printf("  %u -> %u\n", n, remap[n]);
			return;
		}
		for (n = 1; n <= ret; n++)
			remap[n] = Q_atoi(Cmd_Argv (n+1));
		return;
	}

	if (Q_strcasecmp(command, "close") == 0)
	{
		CDAudio_CloseDoor();
		return;
	}

	if (!cdValid)
	{
		CDAudio_GetAudioDiskInfo();
		if (!cdValid)
		{
			Con_Printf("No CD in player.\n");
			return;
		}
	}

	if (Q_strcasecmp(command, "play") == 0)
	{
		CDAudio_Play((byte)Q_atoi(Cmd_Argv (2)), false);
		return;
	}

	if (Q_strcasecmp(command, "loop") == 0)
	{
		CDAudio_Play((byte)Q_atoi(Cmd_Argv (2)), true);
		return;
	}

	if (Q_strcasecmp(command, "stop") == 0)
	{
		CDAudio_Stop();
		return;
	}

	if (Q_strcasecmp(command, "pause") == 0)
	{
		CDAudio_Pause();
		return;
	}

	if (Q_strcasecmp(command, "resume") == 0)
	{
		CDAudio_Resume();
		return;
	}

	if (Q_strcasecmp(command, "eject") == 0)
	{
		if (playing)
			CDAudio_Stop();
		CDAudio_Eject();
		cdValid = false;
		return;
	}
	
	if(!Q_strcasecmp(command,"random"))
	{
		CDAudio_RandomPlay();
		return;
	}


	if (Q_strcasecmp(command, "info") == 0)
	{
		Con_Printf("%u tracks\n", maxTrack);
		if (playing)
			Con_Printf("Currently %s track %u\n", playLooping ? "looping" : "playing", playTrack);
		else if (wasPlaying)
			Con_Printf("Paused %s track %u\n", playLooping ? "looping" : "playing", playTrack);
		Con_Printf("Volume is %f\n", cdvolume);
		return;
	}
}

void CDAudio_Update(void)
{
	struct cdrom_subchnl subchnl;
	static time_t lastchk;

	if (!enabled)
		return;

	if (bgmvolume.value != cdvolume)
	{
		if (cdvolume)
		{
			Cvar_SetValue ("bgmvolume", 0.0);
			cdvolume = bgmvolume.value;
			CDAudio_Pause ();
		}
		else
		{
			Cvar_SetValue ("bgmvolume", 1.0);
			cdvolume = bgmvolume.value;
			CDAudio_Resume ();
		}
	}

	if (playing && lastchk < time(NULL)) {
		lastchk = time(NULL) + 2; //two seconds between chks
		subchnl.cdsc_format = CDROM_MSF;
		if (ioctl(cdfile, CDROMSUBCHNL, &subchnl) == -1 ) {
			Con_DPrintf("ioctl cdromsubchnl failed\n");
			playing = false;
			return;
		}
		if (subchnl.cdsc_audiostatus != CDROM_AUDIO_PLAY &&
			subchnl.cdsc_audiostatus != CDROM_AUDIO_PAUSED) {
			playing = false;
			if (playLooping)
				CDAudio_Play(playTrack, true);
		}
	}
}

int CDAudio_Init(void)
{
	int i;

	if (cls.state == ca_dedicated)
		return -1;

	if (COM_CheckParm("-nocdaudio"))
		return -1;

	if ((i = COM_CheckParm("-cddev")) != 0 && i < com_argc - 1) {
		strncpy(cd_dev, com_argv[i + 1], sizeof(cd_dev));
		cd_dev[sizeof(cd_dev) - 1] = 0;
	}

	if ((cdfile = open(cd_dev, O_RDONLY)) == -1) {
		Con_Printf("CDAudio_Init: open of \"%s\" failed (%i)\n", cd_dev, errno);
		cdfile = -1;
		return -1;
	}

	for (i = 0; i < 100; i++)
		remap[i] = i;
	initialized = true;
	enabled = true;

	if (CDAudio_GetAudioDiskInfo())
	{
		Con_Printf("CDAudio_Init: No CD in player.\n");
		cdValid = false;
	}

	Cmd_AddCommand ("cd", CD_f);

	Con_Printf("CD Audio Initialized\n");

	return 0;
}


void CDAudio_Shutdown(void)
{
	if (!initialized)
		return;
	CDAudio_Stop();
	close(cdfile);
	cdfile = -1;
}
