/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2009 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

#ifdef SDL_CDROM_MINT

/*
	Atari MetaDOS CD-ROM functions

	Patrice Mandin
*/

#include <errno.h>

#include <cdromio.h>
#include <metados.h>

#include "SDL_cdrom.h"
#include "../SDL_syscdrom.h"

/* Some ioctl() errno values which occur when the tray is empty */
#ifndef ENOMEDIUM
#define ENOMEDIUM ENOENT
#endif
#define ERRNO_TRAYEMPTY(errno)	\
	((errno == EIO)    || (errno == ENOENT) || \
	 (errno == EINVAL) || (errno == ENOMEDIUM))

/* The maximum number of CD-ROM drives we'll detect */
#define MAX_DRIVES	32

typedef struct
{
    unsigned char device[3];    /* Physical device letter + ':' + '\0' */
    metaopen_t metaopen;        /* Infos on opened drive */
} metados_drive_t;

static metados_drive_t metados_drives[MAX_DRIVES];

/* The system-dependent CD control functions */
static const char *SDL_SYS_CDName(int drive);
static int SDL_SYS_CDOpen(int drive);
static void SDL_SYS_CDClose(SDL_CD * cdrom);
static int SDL_SYS_CDioctl(int id, int command, void *arg);
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);

int
SDL_SYS_CDInit(void)
{
    metainit_t metainit = { 0, 0, 0, 0 };
    metaopen_t metaopen;
    int i, handle;
    struct cdrom_subchnl info;

    Metainit(&metainit);
    if (metainit.version == NULL) {
#ifdef DEBUG_CDROM
        fprintf(stderr, "MetaDOS not installed\n");
#endif
        return -1;
    }

    if (metainit.drives_map == 0) {
#ifdef DEBUG_CDROM
        fprintf(stderr, "No MetaDOS devices present\n");
#endif
        return -1;
    }

    SDL_numcds = 0;

    for (i = 'A'; i <= 'Z'; i++) {
        metados_drives[SDL_numcds].device[0] = 0;
        metados_drives[SDL_numcds].device[1] = ':';
        metados_drives[SDL_numcds].device[2] = 0;

        if (metainit.drives_map & (1 << (i - 'A'))) {
            handle = Metaopen(i, &metaopen);
            if (handle == 0) {

                info.cdsc_format = CDROM_MSF;
                if ((Metaioctl
                     (i, METADOS_IOCTL_MAGIC, CDROMSUBCHNL, &info) == 0)
                    || ERRNO_TRAYEMPTY(errno)) {
                    metados_drives[SDL_numcds].device[0] = i;
                    ++SDL_numcds;
                }

                Metaclose(i);
            }
        }
    }

    /* Fill in our driver capabilities */
    SDL_CDcaps.Name = SDL_SYS_CDName;
    SDL_CDcaps.Open = SDL_SYS_CDOpen;
    SDL_CDcaps.Close = SDL_SYS_CDClose;

    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;

    return 0;
}

void
SDL_SYS_CDQuit(void)
{
    SDL_numcds = 0;
}

static const char *
SDL_SYS_CDName(int drive)
{
    return (metados_drives[drive].device);
}

static int
SDL_SYS_CDOpen(int drive)
{
    int handle;

    handle =
        Metaopen(metados_drives[drive].device[0],
                 &(metados_drives[drive].metaopen));
    if (handle == 0) {
        return drive;
    }

    return -1;
}

static void
SDL_SYS_CDClose(SDL_CD * cdrom)
{
    Metaclose(metados_drives[cdrom->id].device[0]);
}

static int
SDL_SYS_CDioctl(int id, int command, void *arg)
{
    int retval;

    retval =
        Metaioctl(metados_drives[id].device[0], METADOS_IOCTL_MAGIC, command,
                  arg);
    if (retval < 0) {
        SDL_SetError("ioctl() error: %s", strerror(errno));
    }
    return (retval);
}

static int
SDL_SYS_CDGetTOC(SDL_CD * cdrom)
{
    int i, okay;
    struct cdrom_tochdr toc;
    struct cdrom_tocentry entry;

    /* Use standard ioctl() */
    if (SDL_SYS_CDioctl(cdrom->id, CDROMREADTOCHDR, &toc) < 0) {
        return -1;
    }

    cdrom->numtracks = toc.cdth_trk1 - toc.cdth_trk0 + 1;
    if (cdrom->numtracks > SDL_MAX_TRACKS) {
        cdrom->numtracks = SDL_MAX_TRACKS;
    }

    /* Read all the track TOC entries */
    okay = 1;
    for (i = 0; i <= cdrom->numtracks; ++i) {
        if (i == cdrom->numtracks) {
            cdrom->track[i].id = CDROM_LEADOUT;
        } else {
            cdrom->track[i].id = toc.cdth_trk0 + i;
        }
        entry.cdte_track = cdrom->track[i].id;
        entry.cdte_format = CDROM_MSF;
        if (SDL_SYS_CDioctl(cdrom->id, CDROMREADTOCENTRY, &entry) < 0) {
            okay = 0;
            break;
        } else {
            if (entry.cdte_ctrl & CDROM_DATA_TRACK) {
                cdrom->track[i].type = SDL_DATA_TRACK;
            } else {
                cdrom->track[i].type = SDL_AUDIO_TRACK;
            }
            cdrom->track[i].offset =
                MSF_TO_FRAMES(entry.cdte_addr.msf.minute,
                              entry.cdte_addr.msf.second,
                              entry.cdte_addr.msf.frame);
            cdrom->track[i].length = 0;
            if (i > 0) {
                cdrom->track[i - 1].length =
                    cdrom->track[i].offset - cdrom->track[i - 1].offset;
            }
        }
    }

    return (okay ? 0 : -1);
}

/* Get CD-ROM status */
static CDstatus
SDL_SYS_CDStatus(SDL_CD * cdrom, int *position)
{
    CDstatus status;
    struct cdrom_tochdr toc;
    struct cdrom_subchnl info;

    info.cdsc_format = CDROM_MSF;
    if (SDL_SYS_CDioctl(cdrom->id, CDROMSUBCHNL, &info) < 0) {
        if (ERRNO_TRAYEMPTY(errno)) {
            status = CD_TRAYEMPTY;
        } else {
            status = CD_ERROR;
        }
    } else {
        switch (info.cdsc_audiostatus) {
        case CDROM_AUDIO_INVALID:
        case CDROM_AUDIO_NO_STATUS:
            /* Try to determine if there's a CD available */
            if (SDL_SYS_CDioctl(cdrom->id, CDROMREADTOCHDR, &toc) == 0) {
                status = CD_STOPPED;
            } else {
                status = CD_TRAYEMPTY;
            }
            break;
        case CDROM_AUDIO_COMPLETED:
            status = CD_STOPPED;
            break;
        case CDROM_AUDIO_PLAY:
            status = CD_PLAYING;
            break;
        case CDROM_AUDIO_PAUSED:
            /* Workaround buggy CD-ROM drive */
            if (info.cdsc_trk == CDROM_LEADOUT) {
                status = CD_STOPPED;
            } else {
                status = CD_PAUSED;
            }
            break;
        default:
            status = CD_ERROR;
            break;
        }
    }
    if (position) {
        if (status == CD_PLAYING || (status == CD_PAUSED)) {
            *position = MSF_TO_FRAMES(info.cdsc_absaddr.msf.minute,
                                      info.cdsc_absaddr.msf.second,
                                      info.cdsc_absaddr.msf.frame);
        } else {
            *position = 0;
        }
    }
    return (status);
}

/* Start play */
static int
SDL_SYS_CDPlay(SDL_CD * cdrom, int start, int length)
{
    struct cdrom_msf playtime;

    FRAMES_TO_MSF(start,
                  &playtime.cdmsf_min0, &playtime.cdmsf_sec0,
                  &playtime.cdmsf_frame0);
    FRAMES_TO_MSF(start + length, &playtime.cdmsf_min1, &playtime.cdmsf_sec1,
                  &playtime.cdmsf_frame1);
#ifdef DEBUG_CDROM
    fprintf(stderr, "Trying to play from %d:%d:%d to %d:%d:%d\n",
            playtime.cdmsf_min0, playtime.cdmsf_sec0, playtime.cdmsf_frame0,
            playtime.cdmsf_min1, playtime.cdmsf_sec1, playtime.cdmsf_frame1);
#endif

    return SDL_SYS_CDioctl(cdrom->id, CDROMPLAYMSF, &playtime);
}

/* Pause play */
static int
SDL_SYS_CDPause(SDL_CD * cdrom)
{
    return SDL_SYS_CDioctl(cdrom->id, CDROMPAUSE, 0);
}

/* Resume play */
static int
SDL_SYS_CDResume(SDL_CD * cdrom)
{
    return SDL_SYS_CDioctl(cdrom->id, CDROMRESUME, 0);
}

/* Stop play */
static int
SDL_SYS_CDStop(SDL_CD * cdrom)
{
    return SDL_SYS_CDioctl(cdrom->id, CDROMSTOP, 0);
}

/* Eject the CD-ROM */
static int
SDL_SYS_CDEject(SDL_CD * cdrom)
{
    return SDL_SYS_CDioctl(cdrom->id, CDROMEJECT, 0);
}

#endif /* SDL_CDROM_MINT */
/* vi: set ts=4 sw=4 expandtab: */