/**

 * $Id$

 *

 * Copyright (c) 2009 Nathan Keynes.

 *

 * 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.

 */

#include <assert.h>

#include <errno.h>

#include <fcntl.h>

#include <stdio.h>

#include <string.h>

#include <glib/gmem.h>

#include <glib/gstrfuncs.h>

#include "lxdream.h"

#include "drivers/cdrom/cdrom.h"

#include "drivers/cdrom/cdimpl.h"

extern struct cdrom_disc_factory linux_cdrom_drive_factory;

extern struct cdrom_disc_factory nrg_disc_factory;

extern struct cdrom_disc_factory cdi_disc_factory;

extern struct cdrom_disc_factory gdi_disc_factory;

cdrom_disc_factory_t cdrom_disc_factories[] = {

#ifdef HAVE_LINUX_CDROM

        &linux_cdrom_drive_factory,

#endif

        &nrg_disc_factory,

        &cdi_disc_factory,

        &gdi_disc_factory,

        NULL };

/********************* Implementation Support functions ************************/

cdrom_error_t default_image_read_blocks( sector_source_t source, cdrom_lba_t lba, cdrom_count_t count,

                                         unsigned char *buf )

{

    assert( 0 && "read_blocks called on a cdrom disc" );

    return CDROM_ERROR_BADREAD;

}

cdrom_error_t default_image_read_sectors( sector_source_t source, cdrom_lba_t lba, cdrom_count_t count,

                                          cdrom_read_mode_t mode, unsigned char *buf, size_t *length )

{

    assert( IS_SECTOR_SOURCE_TYPE(source,DISC_SECTOR_SOURCE) );

    cdrom_disc_t disc = (cdrom_disc_t)source;

    size_t len = 0, tmplen;

    cdrom_count_t current = 0;

    while( current < count ) {

        cdrom_track_t track = cdrom_disc_get_track_by_lba( disc, lba + current );

        if( track == NULL )

            return CDROM_ERROR_BADREAD;

        uint32_t track_size = cdrom_disc_get_track_size( disc, track );

        cdrom_lba_t track_offset = lba + current - track->lba;

        cdrom_count_t sub_count = count - current;

        if( track_size - track_offset < sub_count )

            /* Read breaks across track boundaries. This will probably fail (due

             * to inter-track gaps), but try it just in case

             */

            sub_count = track_size - track_offset;

        cdrom_error_t err = track->source->read_sectors( track->source, track_offset, sub_count, mode, &buf[len], &tmplen );

        if( err != CDROM_ERROR_OK )

            return err;

        len += tmplen;

        current += sub_count;

    }

    *length = len;

    return CDROM_ERROR_OK;

}

void default_cdrom_disc_destroy( sector_source_t source )

{

    assert( IS_SECTOR_SOURCE_TYPE(source,DISC_SECTOR_SOURCE) );

    cdrom_disc_t disc = (cdrom_disc_t)source;

    int i;

    for( i=0; i<disc->track_count; i++ ) {

        sector_source_unref( disc->track[i].source );

    }

    sector_source_unref( disc->base_source );

    g_free( (char *)disc->name );

    default_sector_source_destroy( source );

}

cdrom_disc_t cdrom_disc_init( cdrom_disc_t disc, const char *filename )

{

    sector_source_init( &disc->source, DISC_SECTOR_SOURCE, SECTOR_UNKNOWN, 0, default_image_read_blocks,

            default_cdrom_disc_destroy );

    disc->source.read_sectors = default_image_read_sectors;

    disc->disc_type = CDROM_DISC_NONE;

    disc->track_count = disc->session_count = 0;

    for( int i=0; i<99; i++ ) {

        disc->track[i].trackno = i+1;

    }

    if( filename != NULL )

        disc->name = g_strdup(filename);

    return disc;

}

cdrom_disc_t cdrom_disc_new( const char *name, ERROR *err )

{

    cdrom_disc_t disc = g_malloc0( sizeof(struct cdrom_disc) );

    if( disc != NULL ) {

        cdrom_disc_init( disc, name );

    } else {

        SET_ERROR(err, ENOMEM, "Unable to allocate memory for cdrom disc");

    }

    return disc;

}

/**

 * Construct a new image-based disc using the given filename as the base source.

 * TOC is initialized to the empty values.

 */

static cdrom_disc_t cdrom_disc_image_new( const char *filename, ERROR *err )

{

    cdrom_disc_t disc = cdrom_disc_new( filename, err );

    if( disc != NULL && filename != NULL ) {

        disc->base_source = file_sector_source_new_filename( filename, SECTOR_UNKNOWN, 0, FILE_SECTOR_FULL_FILE );

        if( disc->base_source == NULL ) {

            SET_ERROR( err, errno, "Unable to open cdrom file '%s': %s", filename, strerror(errno) );

            cdrom_disc_unref(disc);

            disc = NULL;

        } else {

            sector_source_ref(disc->base_source);

        }

    }

    return disc;

}

cdrom_lba_t cdrom_disc_compute_leadout( cdrom_disc_t disc )

{

    if( disc->track_count == 0 ) {

        disc->leadout = 0;

    } else {

        cdrom_track_t last_track = &disc->track[disc->track_count-1];

        if( last_track->source != NULL ) {

            cdrom_lba_t leadout = last_track->lba + last_track->source->size;

            if( leadout > disc->leadout )

                disc->leadout = leadout;

        }

    }

    return disc->leadout;

}

void cdrom_disc_set_default_disc_type( cdrom_disc_t disc )

{

    int type = CDROM_DISC_NONE, i;

    for( i=0; i<disc->track_count; i++ ) {

        if( (disc->track[i].flags & TRACK_FLAG_DATA == 0) ) {

            if( type == CDROM_DISC_NONE )

                type = CDROM_DISC_AUDIO;

        } else if( disc->track[i].source != NULL &&

                   (disc->track[i].source->mode == SECTOR_MODE1 ||

                    disc->track[i].source->mode == SECTOR_RAW_NONXA) ) {

            if( type != CDROM_DISC_XA )

                type = CDROM_DISC_NONXA;

        } else {

            type = CDROM_DISC_XA;

            break;

        }

    }

    disc->disc_type = type;

}

void cdrom_disc_clear_toc( cdrom_disc_t disc )

{

    disc->disc_type = CDROM_DISC_NONE;

    disc->leadout = 0;

    disc->track_count = 0;

    disc->session_count = 0;

    for( unsigned i=0; i< CDROM_MAX_TRACKS; i++ ) {

        if( disc->track[i].source != NULL ) {

            sector_source_unref( disc->track[i].source );

            disc->track[i].source = NULL;

        }

    }

}

gboolean cdrom_disc_read_toc( cdrom_disc_t disc, ERROR *err )

{

    /* First set the defaults for an empty disc */

    cdrom_disc_clear_toc(disc);

    if( disc->read_toc(disc, err ) ) {

        /* Success - update disc type and leadout if the TOC read didn't set them */

        if( disc->disc_type == CDROM_DISC_NONE )

            cdrom_disc_set_default_disc_type(disc);

        cdrom_disc_compute_leadout(disc);

        return TRUE;

    } else {

        /* Reset to an empty disc in case the reader left things in an

         * inconsistent state */

        cdrom_disc_clear_toc(disc);

        return FALSE;

    }

}

FILE *cdrom_disc_get_base_file( cdrom_disc_t disc )

{

    return file_sector_source_get_file(disc->base_source);

}

/*************************** Public functions ***************************/

cdrom_disc_t cdrom_disc_open( const char *inFilename, ERROR *err )

{

    const gchar *filename = inFilename;

    const gchar *ext = strrchr(filename, '.');

    int i;

    cdrom_disc_factory_t extclz = NULL;

    /* Ask the drive list if it recognizes the name first */

    cdrom_drive_t drive = cdrom_drive_find(inFilename);

    if( drive != NULL ) {

        return cdrom_drive_open(drive, err);

    }

    cdrom_disc_t disc = cdrom_disc_image_new( filename, err );

    if( disc == NULL )

        return NULL;

    /* check file extensions first */

    FILE *f = file_sector_source_get_file(disc->base_source);

    if( ext != NULL ) {

        ext++; /* Skip the '.' */

        for( i=0; cdrom_disc_factories[i] != NULL; i++ ) {

            if( cdrom_disc_factories[i]->extension != NULL &&

                    strcasecmp( cdrom_disc_factories[i]->extension, ext ) == 0 ) {

                extclz = cdrom_disc_factories[i];

                if( extclz->is_valid_file(f) ) {

                    disc->read_toc = extclz->read_toc;

                }

                break;

            }

        }

    }

    if( disc->read_toc == NULL ) {

        /* Okay, fall back to magic */

        for( i=0; cdrom_disc_factories[i] != NULL; i++ ) {

            if( cdrom_disc_factories[i] != extclz &&

                cdrom_disc_factories[i]->is_valid_file(f) ) {

                disc->read_toc = cdrom_disc_factories[i]->read_toc;

                break;

            }

        }

    }

    if( disc->read_toc != NULL && cdrom_disc_read_toc( disc, err ) ) {

        /* All good */

        return disc;

    } else {

        /* No handler found for file */

        cdrom_disc_unref( disc );

        SET_ERROR( err, EINVAL, "File '%s' could not be recognized as any known image file or device type" );

        return NULL;

    }

}

/**

 * Get the track information for the given track. If there is no such track,

 * return NULL;

 */

cdrom_track_t cdrom_disc_get_track( cdrom_disc_t disc, cdrom_trackno_t track )

{

    if( track < 1 || track >= disc->track_count )

        return NULL;

    return &disc->track[track-1];

}

/**

 * Get the track information for the first track of the given session. If there

 * is no such session, return NULL;

 */

cdrom_track_t cdrom_disc_get_session( cdrom_disc_t disc, cdrom_sessionno_t session )

{

    for( unsigned i=0; i< disc->track_count; i++ ) {

        if( disc->track[i].sessionno == session )

            return &disc->track[i];

    }

    return NULL;

}

cdrom_count_t cdrom_disc_get_track_size( cdrom_disc_t disc, cdrom_track_t track )

{

    if( track->trackno == disc->track_count )

        return disc->leadout - track->lba;

    else

        return disc->track[track->trackno].lba - track->lba;

}

cdrom_track_t cdrom_disc_get_last_track( cdrom_disc_t disc )

{

    if( disc->track_count == 0 )

        return NULL;

    return &disc->track[disc->track_count-1];

}

cdrom_track_t cdrom_disc_prev_track( cdrom_disc_t disc, cdrom_track_t track )

{

    if( track->trackno <= 1 )

        return NULL;

    return cdrom_disc_get_track( disc, track->trackno-1 );

}

cdrom_track_t cdrom_disc_next_track( cdrom_disc_t disc, cdrom_track_t track )

{

    if( track->trackno >= disc->track_count )

        return NULL;

    return cdrom_disc_get_track( disc, track->trackno+1 );

}

/**

 * Find the track containing the sector specified by LBA.

 * Note: this function does not check for media change.

 * @return The track, or NULL if no track contains the sector.

 */

cdrom_track_t cdrom_disc_get_track_by_lba( cdrom_disc_t disc, cdrom_lba_t lba )

{

    if( disc->track_count == 0 || disc->track[0].lba > lba || lba >= disc->leadout )

        return NULL; /* LBA outside disc bounds */

    for( unsigned i=1; i< disc->track_count; i++ ) {

        if( lba < disc->track[i].lba )

            return &disc->track[i-1];

    }

    return &disc->track[disc->track_count-1];

}

cdrom_error_t cdrom_disc_read_sectors( cdrom_disc_t disc, cdrom_lba_t lba, cdrom_count_t count,

                                       cdrom_read_mode_t mode, unsigned char *buf, size_t *length )

{

    return disc->source.read_sectors( &disc->source, lba, count, mode, buf, length );

}

/**

 * Check if the disc contains valid media.

 * @return CDROM_ERROR_OK if disc is present, otherwise CDROM_ERROR_NODISC

 */

cdrom_error_t cdrom_disc_check_media( cdrom_disc_t disc )

{

    if( disc == NULL )

        return CDROM_ERROR_NODISC;

    if( disc->check_media != NULL )

        disc->check_media(disc);

    return disc->disc_type == CDROM_DISC_NONE ? CDROM_ERROR_NODISC : CDROM_ERROR_OK;

}

void cdrom_disc_print_toc( FILE *f, cdrom_disc_t disc )

{

    int i;

    int session = 0;

    if( disc == NULL || disc->track_count == 0 ) {

        fprintf( f, "No disc\n" );

        return;

    }

    for( i=0; i<disc->track_count; i++ ) {

        cdrom_track_t track = &disc->track[i];

        if( track->sessionno != session ) {

            session = disc->track[i].sessionno;

            fprintf( f, "Session %d:\n", session );

        }

        fprintf( f, "  %02d. %6d %02x\n", track->trackno, track->lba, track->flags );

    }

}

void cdrom_disc_dump_toc( cdrom_disc_t disc )

{

    cdrom_disc_print_toc( stderr, disc );

}