/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2002 Daniel Stenberg
 *
 * All files in this archive are subject to the GNU General Public License.
 * See the file COPYING in the source tree root for full license agreement.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <sys/stat.h>
#ifdef __FreeBSD__
#include <sys/param.h>
#include <sys/mount.h>
#elif defined(__APPLE__)
#include <sys/param.h>
#include <sys/mount.h>
#elif !defined(WIN32)
#include <sys/vfs.h>
#endif

#ifdef WIN32
#include <windows.h>
#endif

#ifndef _MSC_VER
#include <dirent.h>
#include <unistd.h>
#else
#include "dir-win32.h"
#endif

#define MAX_PATH 260

#include <fcntl.h>

#include "debug.h"
#include "config.h"

#ifdef HAVE_DIRCACHE
void dircache_remove(const char *name);
void dircache_rename(const char *oldpath, const char *newpath);
#endif

#define SIMULATOR_ARCHOS_ROOT "archos"

struct sim_dirent {
    unsigned char d_name[MAX_PATH];
    int attribute;
    int size;
    int startcluster;
    unsigned short wrtdate; /*  Last write date */ 
    unsigned short wrttime; /*  Last write time */
};

struct dirstruct {
    void *dir; /* actually a DIR* dir */
    char *name;    
} SIM_DIR;

struct mydir {
    DIR *dir;
    char *name;
};

typedef struct mydir MYDIR;

#if 1 /* maybe this needs disabling for MSVC... */
static unsigned int rockbox2sim(int opt)
{
#ifdef WIN32
    int newopt = O_BINARY;
#else
    int newopt = 0;
#endif
    if(opt & 1)
        newopt |= O_WRONLY;
    if(opt & 2)
        newopt |= O_RDWR;
    if(opt & 4)
        newopt |= O_CREAT;
    if(opt & 8)
        newopt |= O_APPEND;
    if(opt & 0x10)
        newopt |= O_TRUNC;

    return newopt;
}
#endif

MYDIR *sim_opendir(const char *name)
{
    char buffer[256]; /* sufficiently big */
    DIR *dir;

#ifndef __PCTOOL__
    if(name[0] == '/') 
    {
        sprintf(buffer, "%s%s", SIMULATOR_ARCHOS_ROOT, name);    
        dir=(DIR *)opendir(buffer);
    }
    else
#endif
        dir=(DIR *)opendir(name);
    
    if(dir) {
        MYDIR *my = (MYDIR *)malloc(sizeof(MYDIR));
        my->dir = dir;
        my->name = (char *)strdup(name);

        return my;
    }
    /* failed open, return NULL */
    return (MYDIR *)0;
}

struct sim_dirent *sim_readdir(MYDIR *dir)
{
    char buffer[512]; /* sufficiently big */
    static struct sim_dirent secret;
    struct stat s;
    struct dirent *x11 = (readdir)(dir->dir);

    if(!x11)
        return (struct sim_dirent *)0;

    strcpy((char *)secret.d_name, x11->d_name);

    /* build file name */
#ifdef __PCTOOL__
    sprintf(buffer, "%s/%s", dir->name, x11->d_name);
#else
    sprintf(buffer, SIMULATOR_ARCHOS_ROOT "%s/%s",
            dir->name, x11->d_name);
#endif
    stat(buffer, &s); /* get info */

#define ATTR_DIRECTORY 0x10
    
    secret.attribute = S_ISDIR(s.st_mode)?ATTR_DIRECTORY:0;
    secret.size = s.st_size;
    secret.wrtdate = (unsigned short)(s.st_mtime >> 16); 
    secret.wrttime = (unsigned short)(s.st_mtime & 0xFFFF); 

    return &secret;
}

void sim_closedir(MYDIR *dir)
{
    free(dir->name);
    closedir(dir->dir);

    free(dir);
}

int sim_open(const char *name, int o)
{
    char buffer[256]; /* sufficiently big */
    int opts = rockbox2sim(o);

#ifndef __PCTOOL__
    if(name[0] == '/') 
    {
        sprintf(buffer, "%s%s", SIMULATOR_ARCHOS_ROOT, name);

        debugf("We open the real file '%s'\n", buffer);
        return open(buffer, opts, 0666);
    }
    
    fprintf(stderr, "WARNING, bad file name lacks slash: %s\n",
            name);
    return -1;
#else
    return open(name, opts, 0666);
#endif
    
}

int sim_creat(const char *name, mode_t mode)
{
    int opts = rockbox2sim(mode);
    
#ifndef __PCTOOL__
    char buffer[256]; /* sufficiently big */
    if(name[0] == '/') 
    {
        sprintf(buffer, "%s%s", SIMULATOR_ARCHOS_ROOT, name);
        
        debugf("We create the real file '%s'\n", buffer);
        return open(buffer, opts | O_CREAT | O_TRUNC, 0666);
    }
    fprintf(stderr, "WARNING, bad file name lacks slash: %s\n",
            name);
    return -1;
#else
    return open(name, opts | O_CREAT | O_TRUNC, 0666);
#endif
}      

int sim_mkdir(const char *name, mode_t mode)
{
    (void)mode;
#ifdef __PCTOOL__
# ifdef WIN32
    return mkdir(name);
# else
    return mkdir(name, 0777);
# endif
#else
    char buffer[256]; /* sufficiently big */

    sprintf(buffer, "%s%s", SIMULATOR_ARCHOS_ROOT, name);
        
    debugf("We create the real directory '%s'\n", buffer);
#ifdef WIN32
    /* since we build with -DNOCYGWIN we have the plain win32 version */
    return mkdir(buffer);
#else
    return mkdir(buffer, 0777);
#endif
#endif
}

int sim_rmdir(const char *name)
{
#ifdef __PCTOOL__
    return rmdir(name);
#else
    char buffer[256]; /* sufficiently big */
    if(name[0] == '/') 
    {
        sprintf(buffer, "%s%s", SIMULATOR_ARCHOS_ROOT, name);
        
        debugf("We remove the real directory '%s'\n", buffer);
        return rmdir(buffer);
    }
    return rmdir(name);
#endif
}

int sim_remove(const char *name)
{
#ifdef __PCTOOL__
    return remove(name);
#else
    char buffer[256]; /* sufficiently big */

#ifdef HAVE_DIRCACHE
    dircache_remove(name);
#endif

    if(name[0] == '/') {
        sprintf(buffer, "%s%s", SIMULATOR_ARCHOS_ROOT, name);

        debugf("We remove the real file '%s'\n", buffer);
        return remove(buffer);
    }
    return remove(name);
#endif
}

int sim_rename(const char *oldpath, const char* newpath)
{
#ifdef __PCTOOL__
    return rename(oldpath, newpath);
#else
    char buffer1[256];
    char buffer2[256];

#ifdef HAVE_DIRCACHE
    dircache_rename(oldpath, newpath);
#endif

    if(oldpath[0] == '/') {
        sprintf(buffer1, "%s%s", SIMULATOR_ARCHOS_ROOT, oldpath);
        sprintf(buffer2, "%s%s", SIMULATOR_ARCHOS_ROOT, newpath);

        debugf("We rename the real file '%s' to '%s'\n", buffer1, buffer2);
        return rename(buffer1, buffer2);
    }
    return -1;
#endif
}

/* rockbox off_t may be different from system off_t */
long sim_lseek(int fildes, long offset, int whence)
{
    return lseek(fildes, offset, whence);
}

long sim_filesize(int fd)
{
#ifdef WIN32
    return _filelength(fd);
#else
    struct stat buf;
    
    if (!fstat(fd, &buf))
        return buf.st_size;
    else
        return -1;
#endif
}

void fat_size(unsigned int* size, unsigned int* free)
{
#ifdef WIN32
    long secperclus, bytespersec, free_clusters, num_clusters;

    if (GetDiskFreeSpace(NULL, &secperclus, &bytespersec, &free_clusters,
                     &num_clusters)) {
        if (size)
            *size = num_clusters * secperclus / 2 * (bytespersec / 512);
        if (free)
            *free = free_clusters * secperclus / 2 * (bytespersec / 512);
    }
#else
    struct statfs fs;

    if (!statfs(".", &fs)) {
        DEBUGF("statfs: bsize=%d blocks=%d free=%d\n",
               fs.f_bsize, fs.f_blocks, fs.f_bfree);
        if (size)
            *size = fs.f_blocks * (fs.f_bsize / 1024);
        if (free)
            *free = fs.f_bfree * (fs.f_bsize / 1024);
    }
#endif
    else {
        if (size)
            *size = 0;
        if (free)
            *free = 0;
    }
}

int sim_fsync(int fd)
{
#ifdef WIN32
    return _commit(fd);
#else
    return fsync(fd);
#endif
}

#ifdef WIN32
/* sim-win32 */
#define dlopen(_x_, _y_) LoadLibrary(_x_)
#define dlsym(_x_, _y_) (void *)GetProcAddress(_x_, _y_)
#define dlclose(_x_) FreeLibrary(_x_)
#else
/* sim-x11 */
#include <dlfcn.h>
#endif

#define TEMP_CODEC_FILE "archos/_temp_codec%d.dll"

void *sim_codec_load_ram(char* codecptr, int size,
        void* ptr2, int bufwrap, void **pd)
{
    void *hdr;
    char path[MAX_PATH];
    int fd;
    int copy_n;
    int codec_count;
#ifdef WIN32
    char buf[256];
#endif

    *pd = NULL;

    /* We have to create the dynamic link library file from ram so we 
       can simulate the codec loading. With voice and crossfade,
       multiple codecs may be loaded at the same time, so we need 
       to find an unused filename */
    for (codec_count = 0; codec_count < 10; codec_count++)
    {
        sprintf(path, TEMP_CODEC_FILE, codec_count);

    #ifdef WIN32
        fd = open(path, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, S_IRWXU);
    #else
        fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, S_IRWXU);
    #endif
        if (fd >= 0)
            break;  /* Created a file ok */
    }
    if (fd < 0)        
    {
        DEBUGF("failed to open for write: %s\n", path);
        return NULL;
    }

    if (bufwrap == 0)
        bufwrap = size;
        
    copy_n = bufwrap < size ? bufwrap : size;
    if (write(fd, codecptr, copy_n) != copy_n) {
        DEBUGF("write failed");
        return NULL;
    }
    size -= copy_n;
    if (size > 0) {
        if (write(fd, ptr2, size) != size) {
            DEBUGF("write failed [2]");
            return NULL;
        }
    }
    close(fd);

    /* Now load the library. */
    *pd = dlopen(path, RTLD_NOW);
    if (*pd == NULL) {
        DEBUGF("failed to load %s\n", path); 
#ifdef WIN32
        FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, GetLastError(), 0,
                      buf, sizeof buf, NULL);
        DEBUGF("dlopen(%s): %s\n", path, buf);
#else
        DEBUGF("dlopen(%s): %s\n", path, dlerror());
#endif
        return NULL;
    }

    hdr = dlsym(*pd, "__header");
    if (!hdr)
        hdr = dlsym(*pd, "___header");

    return hdr;       /* maybe NULL if symbol not present */
}

void sim_codec_close(void *pd)
{
    dlclose(pd);
}

void *sim_plugin_load(char *plugin, void **pd)
{
    void *hdr;
    char path[256];
#ifdef WIN32
    char buf[256];
#endif

    snprintf(path, sizeof path, "archos%s", plugin);
    
    *pd = NULL;

    *pd = dlopen(path, RTLD_NOW);
    if (*pd == NULL) {
        DEBUGF("failed to load %s\n", plugin);
#ifdef WIN32
        FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, GetLastError(), 0,
                      buf, sizeof buf, NULL);
        DEBUGF("dlopen(%s): %s\n", path, buf);
#else
        DEBUGF("dlopen(%s): %s\n", path, dlerror());
#endif
        return NULL;
    }

    hdr = dlsym(*pd, "__header");
    if (!hdr)
        hdr = dlsym(*pd, "___header");

    return hdr;    /* maybe NULL if symbol not present */
}

void sim_plugin_close(void *pd)
{
    dlclose(pd);
}

#if !defined(WIN32) || defined(SDL)
/* the win32 version is in debug-win32.c */

void debug_init(void)
{
    /* nothing to be done */
}

void debugf(const char *fmt, ...)
{
    va_list ap;
    va_start( ap, fmt );
    vfprintf( stderr, fmt, ap );
    va_end( ap );
}

void ldebugf(const char* file, int line, const char *fmt, ...)
{
    va_list ap;
    va_start( ap, fmt );
    fprintf( stderr, "%s:%d ", file, line );
    vfprintf( stderr, fmt, ap );
    va_end( ap );
}

#endif

/* rockbox off_t may be different from system off_t */
int sim_ftruncate(int fd, long length)
{
#ifdef WIN32
    return _chsize(fd, length);
#else
    return ftruncate(fd, length);
#endif
}