/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2006 Sam Lantinga

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Lesser General Public

    License as published by the Free Software Foundation; either

    version 2.1 of the License, or (at your option) any later version.

    This library 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

    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public

    License along with this library; if not, write to the Free Software

    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga

    slouken@libsdl.org

*/

#include "SDL_config.h"

/* Functions for system-level CD-ROM audio control */

#define WIN32_LEAN_AND_MEAN

#include <windows.h>

#include <mmsystem.h>

#include "SDL_cdrom.h"

#include "../SDL_syscdrom.h"

/* This really broken?? */

#define BROKEN_MCI_PAUSE	/* Pausing actually stops play -- Doh! */

/* The maximum number of CD-ROM drives we'll detect (Don't change!) */

#define MAX_DRIVES	26	

/* A list of available CD-ROM drives */

static char *SDL_cdlist[MAX_DRIVES];

static MCIDEVICEID SDL_mciID[MAX_DRIVES];

#ifdef BROKEN_MCI_PAUSE

static int SDL_paused[MAX_DRIVES];

#endif

static int SDL_CD_end_position;

/* The system-dependent CD control functions */

static const char *SDL_SYS_CDName(int drive);

static int SDL_SYS_CDOpen(int drive);

static int SDL_SYS_CDGetTOC(SDL_CD *cdrom);

static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position);

static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length);

static int SDL_SYS_CDPause(SDL_CD *cdrom);

static int SDL_SYS_CDResume(SDL_CD *cdrom);

static int SDL_SYS_CDStop(SDL_CD *cdrom);

static int SDL_SYS_CDEject(SDL_CD *cdrom);

static void SDL_SYS_CDClose(SDL_CD *cdrom);

/* Add a CD-ROM drive to our list of valid drives */

static void AddDrive(char *drive)

{

	int i;

	if ( SDL_numcds < MAX_DRIVES ) {

		/* Add this drive to our list */

		i = SDL_numcds;

		SDL_cdlist[i] = SDL_strdup(drive);

		if ( SDL_cdlist[i] == NULL ) {

			SDL_OutOfMemory();

			return;

		}

		++SDL_numcds;

#ifdef CDROM_DEBUG

  fprintf(stderr, "Added CD-ROM drive: %s\n", drive);

#endif

	}

}

int  SDL_SYS_CDInit(void)

{

	/* checklist: Drive 'A' - 'Z' */

	int i;

	char drive[4];

	/* Fill in our driver capabilities */

	SDL_CDcaps.Name = SDL_SYS_CDName;

	SDL_CDcaps.Open = SDL_SYS_CDOpen;

	SDL_CDcaps.GetTOC = SDL_SYS_CDGetTOC;

	SDL_CDcaps.Status = SDL_SYS_CDStatus;

	SDL_CDcaps.Play = SDL_SYS_CDPlay;

	SDL_CDcaps.Pause = SDL_SYS_CDPause;

	SDL_CDcaps.Resume = SDL_SYS_CDResume;

	SDL_CDcaps.Stop = SDL_SYS_CDStop;

	SDL_CDcaps.Eject = SDL_SYS_CDEject;

	SDL_CDcaps.Close = SDL_SYS_CDClose;

	/* Scan the system for CD-ROM drives */

	for ( i='A'; i<='Z'; ++i ) {

		SDL_snprintf(drive, SDL_arraysize(drive), "%c:\\", i);

		if ( GetDriveType(drive) == DRIVE_CDROM ) {

			AddDrive(drive);

		}

	}

	SDL_memset(SDL_mciID, 0, sizeof(SDL_mciID));

	return(0);

}

/* General ioctl() CD-ROM command function */

static int SDL_SYS_CDioctl(int id, UINT msg, DWORD flags, void *arg)

{

	MCIERROR mci_error;

	mci_error = mciSendCommand(SDL_mciID[id], msg, flags, (DWORD_PTR)arg);

	if ( mci_error ) {

		char error[256];

		mciGetErrorString(mci_error, error, 256);

		SDL_SetError("mciSendCommand() error: %s", error);

	}

	return(!mci_error ? 0 : -1);

}

static const char *SDL_SYS_CDName(int drive)

{

	return(SDL_cdlist[drive]);

}

static int SDL_SYS_CDOpen(int drive)

{

	MCI_OPEN_PARMS mci_open;

	MCI_SET_PARMS mci_set;

	char device[3];

	DWORD flags;

	/* Open the requested device */

	mci_open.lpstrDeviceType = (LPCSTR) MCI_DEVTYPE_CD_AUDIO;

	device[0] = *SDL_cdlist[drive];

	device[1] = ':';

	device[2] = '\0';

	mci_open.lpstrElementName = device;

	flags =

	  (MCI_OPEN_TYPE|MCI_OPEN_SHAREABLE|MCI_OPEN_TYPE_ID|MCI_OPEN_ELEMENT);

	if ( SDL_SYS_CDioctl(0, MCI_OPEN, flags, &mci_open) < 0 ) {

		flags &= ~MCI_OPEN_SHAREABLE;

		if ( SDL_SYS_CDioctl(0, MCI_OPEN, flags, &mci_open) < 0 ) {

			return(-1);

		}

	}

	SDL_mciID[drive] = mci_open.wDeviceID;

	/* Set the minute-second-frame time format */

	mci_set.dwTimeFormat = MCI_FORMAT_MSF;

	SDL_SYS_CDioctl(drive, MCI_SET, MCI_SET_TIME_FORMAT, &mci_set);

#ifdef BROKEN_MCI_PAUSE

	SDL_paused[drive] = 0;

#endif

	return(drive);

}

static int SDL_SYS_CDGetTOC(SDL_CD *cdrom)

{

	MCI_STATUS_PARMS mci_status;

	int i, okay;

	DWORD flags;

	okay = 0;

	mci_status.dwItem = MCI_STATUS_NUMBER_OF_TRACKS;

	flags = MCI_STATUS_ITEM | MCI_WAIT;

	if ( SDL_SYS_CDioctl(cdrom->id, MCI_STATUS, flags, &mci_status) == 0 ) {

		cdrom->numtracks = mci_status.dwReturn;

		if ( cdrom->numtracks > SDL_MAX_TRACKS ) {

			cdrom->numtracks = SDL_MAX_TRACKS;

		}

		/* Read all the track TOC entries */

		flags = MCI_STATUS_ITEM | MCI_TRACK | MCI_WAIT;

		for ( i=0; i<cdrom->numtracks; ++i ) {

			cdrom->track[i].id = i+1;

			mci_status.dwTrack = cdrom->track[i].id;

#ifdef MCI_CDA_STATUS_TYPE_TRACK

			mci_status.dwItem = MCI_CDA_STATUS_TYPE_TRACK;

			if ( SDL_SYS_CDioctl(cdrom->id, MCI_STATUS, flags,

							&mci_status) < 0 ) {

				break;

			}

			if ( mci_status.dwReturn == MCI_CDA_TRACK_AUDIO ) {

				cdrom->track[i].type = SDL_AUDIO_TRACK;

			} else {

				cdrom->track[i].type = SDL_DATA_TRACK;

			}

#else

			cdrom->track[i].type = SDL_AUDIO_TRACK;

#endif

			mci_status.dwItem = MCI_STATUS_POSITION;

			if ( SDL_SYS_CDioctl(cdrom->id, MCI_STATUS, flags,

							&mci_status) < 0 ) {

				break;

			}

			cdrom->track[i].offset = MSF_TO_FRAMES(

					MCI_MSF_MINUTE(mci_status.dwReturn),

					MCI_MSF_SECOND(mci_status.dwReturn),

					MCI_MSF_FRAME(mci_status.dwReturn));

			cdrom->track[i].length = 0;

			if ( i > 0 ) {

				cdrom->track[i-1].length =

						cdrom->track[i].offset-

						cdrom->track[i-1].offset;

			}

		}

		if ( i == cdrom->numtracks ) {

			mci_status.dwTrack = cdrom->track[i - 1].id;

			mci_status.dwItem = MCI_STATUS_LENGTH;

			if ( SDL_SYS_CDioctl(cdrom->id, MCI_STATUS, flags,

							&mci_status) == 0 ) {

				cdrom->track[i - 1].length = MSF_TO_FRAMES(

					MCI_MSF_MINUTE(mci_status.dwReturn),

					MCI_MSF_SECOND(mci_status.dwReturn),

				/* compute lead-out offset */

				cdrom->track[i].offset = cdrom->track[i - 1].offset +

					cdrom->track[i - 1].length;

				cdrom->track[i].length = 0;

				okay = 1;

			}

		}

	}

	return(okay ? 0 : -1);

}

/* Get CD-ROM status */

static CDstatus SDL_SYS_CDStatus(SDL_CD *cdrom, int *position)

{

	CDstatus status;

	MCI_STATUS_PARMS mci_status;

	DWORD flags;

	flags = MCI_STATUS_ITEM | MCI_WAIT;

	mci_status.dwItem = MCI_STATUS_MODE;

	if ( SDL_SYS_CDioctl(cdrom->id, MCI_STATUS, flags, &mci_status) < 0 ) {

		status = CD_ERROR;

	} else {

		switch (mci_status.dwReturn) {

			case MCI_MODE_NOT_READY:

			case MCI_MODE_OPEN:

				status = CD_TRAYEMPTY;

				break;

			case MCI_MODE_STOP:

#ifdef BROKEN_MCI_PAUSE

				if ( SDL_paused[cdrom->id] ) {

					status = CD_PAUSED;

				} else {

					status = CD_STOPPED;

				}

#else

				status = CD_STOPPED;

#endif /* BROKEN_MCI_PAUSE */

				break;

			case MCI_MODE_PLAY:

#ifdef BROKEN_MCI_PAUSE

				if ( SDL_paused[cdrom->id] ) {

					status = CD_PAUSED;

				} else {

					status = CD_PLAYING;

				}

#else

				status = CD_PLAYING;

#endif /* BROKEN_MCI_PAUSE */

				break;

			case MCI_MODE_PAUSE:

				status = CD_PAUSED;

				break;

			default:

				status = CD_ERROR;

				break;

		}

	}

	if ( position ) {

		if ( status == CD_PLAYING || (status == CD_PAUSED) ) {

			mci_status.dwItem = MCI_STATUS_POSITION;

			if ( SDL_SYS_CDioctl(cdrom->id, MCI_STATUS, flags,

							&mci_status) == 0 ) {

				*position = MSF_TO_FRAMES(

					MCI_MSF_MINUTE(mci_status.dwReturn),

					MCI_MSF_SECOND(mci_status.dwReturn),

					MCI_MSF_FRAME(mci_status.dwReturn));

			} else {

				*position = 0;

			}

		} else {

			*position = 0;

		}

	}

	return(status);

}

/* Start play */

static int SDL_SYS_CDPlay(SDL_CD *cdrom, int start, int length)

{

	MCI_PLAY_PARMS mci_play;

	int m, s, f;

	DWORD flags;

	flags = MCI_FROM | MCI_TO | MCI_NOTIFY;

	mci_play.dwCallback = 0;

	FRAMES_TO_MSF(start, &m, &s, &f);

	mci_play.dwFrom = MCI_MAKE_MSF(m, s, f);

	FRAMES_TO_MSF(start+length, &m, &s, &f);

	mci_play.dwTo = MCI_MAKE_MSF(m, s, f);

	SDL_CD_end_position = mci_play.dwTo;

	return(SDL_SYS_CDioctl(cdrom->id, MCI_PLAY, flags, &mci_play));

}

/* Pause play */

static int SDL_SYS_CDPause(SDL_CD *cdrom)

{

#ifdef BROKEN_MCI_PAUSE

	SDL_paused[cdrom->id] = 1;

#endif

	return(SDL_SYS_CDioctl(cdrom->id, MCI_PAUSE, MCI_WAIT, NULL));

}

/* Resume play */

static int SDL_SYS_CDResume(SDL_CD *cdrom)

{

#ifdef BROKEN_MCI_PAUSE

	MCI_STATUS_PARMS mci_status;

	int okay;

	int flags;

	okay = 0;

	/* Play from the current play position to the end position set earlier */

	flags = MCI_STATUS_ITEM | MCI_WAIT;

	mci_status.dwItem = MCI_STATUS_POSITION;

	if ( SDL_SYS_CDioctl(cdrom->id, MCI_STATUS, flags, &mci_status) == 0 ) {

		MCI_PLAY_PARMS mci_play;

		flags = MCI_FROM | MCI_TO | MCI_NOTIFY;

		mci_play.dwCallback = 0;

		mci_play.dwFrom = mci_status.dwReturn;

		mci_play.dwTo = SDL_CD_end_position;

		if (SDL_SYS_CDioctl(cdrom->id,MCI_PLAY,flags,&mci_play) == 0) {

			okay = 1;

			SDL_paused[cdrom->id] = 0;

		}

	}

	return(okay ? 0 : -1);

#else

	return(SDL_SYS_CDioctl(cdrom->id, MCI_RESUME, MCI_WAIT, NULL));

#endif /* BROKEN_MCI_PAUSE */

}

/* Stop play */

static int SDL_SYS_CDStop(SDL_CD *cdrom)

{

	return(SDL_SYS_CDioctl(cdrom->id, MCI_STOP, MCI_WAIT, NULL));

}

/* Eject the CD-ROM */

static int SDL_SYS_CDEject(SDL_CD *cdrom)

{

	return(SDL_SYS_CDioctl(cdrom->id, MCI_SET, MCI_SET_DOOR_OPEN, NULL));

}

/* Close the CD-ROM handle */

static void SDL_SYS_CDClose(SDL_CD *cdrom)

{

	SDL_SYS_CDioctl(cdrom->id, MCI_CLOSE, MCI_WAIT, NULL);

}

void SDL_SYS_CDQuit(void)

{

	int i;

	if ( SDL_numcds > 0 ) {

		for ( i=0; i<SDL_numcds; ++i ) {

			SDL_free(SDL_cdlist[i]);

		}

		SDL_numcds = 0;

	}

}