/*
Copyright (C) 2003-2004 Ryan C. Gordon. and James Bentler

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.

Originally written by Ryan C. Gordon. (icculus@clutteredmind.org)
Adapted to work with JonoF's port by James Bentler (bentler@cs.umn.edu)

*/

static char ApogeePath[256] = "/tmp/";

#define PATH_SEP_CHAR '/'
#define PATH_SEP_STR  "/"
#define ROOTDIR       "/"
#define CURDIR        "./"

#include "duke3d.h"
#include <dirent.h>
#include <errno.h>

#ifndef MAX_PATH
#define MAX_PATH 256
#endif

void FixFilePath(char *filename)
{
    char *ptr;
    char *lastsep = filename;

    if ((!filename) || (*filename == '\0'))
        return;

    if (access(filename, F_OK) == 0)  /* File exists; we're good to go. */
        return;

    for (ptr = filename; 1; ptr++)
    {
        if (*ptr == '\\')
            *ptr = PATH_SEP_CHAR;

        if ((*ptr == PATH_SEP_CHAR) || (*ptr == '\0'))
        {
            char pch = *ptr;
            struct dirent *dent = NULL;
            DIR *dir;

            if ((pch == PATH_SEP_CHAR) && (*(ptr + 1) == '\0'))
                return; /* eos is pathsep; we're done. */

            if (lastsep == ptr)
                continue;  /* absolute path; skip to next one. */

            *ptr = '\0';
            if (lastsep == filename)
            {
                dir = opendir((*lastsep == PATH_SEP_CHAR) ? ROOTDIR : CURDIR);

                if (*lastsep == PATH_SEP_CHAR)
                {
                    lastsep++;
                }
            }
            else
            {
                *lastsep = '\0';
                dir = opendir(filename);
                *lastsep = PATH_SEP_CHAR;
                lastsep++;
            }

            if (dir == NULL)
            {
                *ptr = PATH_SEP_CHAR;
                return;  /* maybe dir doesn't exist? give up. */
            }

            while ((dent = readdir(dir)) != NULL)
            {
                if (strcasecmp(dent->d_name, lastsep) == 0)
                {
                    /* found match; replace it. */
                    strcpy(lastsep, dent->d_name);
                    break;
                }
            }

            closedir(dir);
            *ptr = pch;
            lastsep = ptr;

            if (dent == NULL)
                return;  /* no match. oh well. */

            if (pch == '\0')  /* eos? */
                return;
        }
    }
}

int32 SafeOpenWrite(const char *_filename, int32 filetype)
{
    int handle;
    char filename[MAX_PATH];
    strncpy(filename, _filename, sizeof(filename));
    filename[sizeof(filename) - 1] = '\0';
    FixFilePath(filename);

    handle = open(filename,O_RDWR | O_BINARY | O_CREAT | O_TRUNC
                  , S_IREAD | S_IWRITE);

    if (handle == -1)
        Error("Error opening %s: %s",filename,strerror(errno));

    return handle;
}


void SafeWrite(int32 handle, void *buffer, int32 count)
{
    unsigned    iocount;

    while (count)
    {
        iocount = count > 0x8000 ? 0x8000 : count;
        if (write(handle,buffer,iocount) != (int)iocount)
            Error("File write failure writing %ld bytes",count);
        buffer = (void *)((byte *)buffer + iocount);
        count -= iocount;
    }
}



void GetUnixPathFromEnvironment(char *fullname, int32 length, const char *filename)
{
    snprintf(fullname, length-1, "%s%s", ApogeePath, filename);
}