/*
 * Copyright (C) 2013 Bryan Christ <bryan.christ@mediafire.com>
 *               2014 Johannes Schauer <j.schauer@email.de>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2, as published by
 * the Free Software Foundation.
 *
 * 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., 51
 * Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 */


#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#include "strings.h"
#include "mfshell.h"
#include "private.h"
#include "command.h"

int
mfshell_cmd_chdir(mfshell_t *mfshell, int argc, char **argv)
{
    folder_t    *folder_new;
    const char  *folder_curr;
    const char  *folder_parent;
    const char  *folderkey;
    int         retval;

    if(mfshell == NULL) return -1;

    if (argc != 2) {
        fprintf(stderr, "Invalid number of arguments\n");
        return -1;
    }

    folderkey = argv[1];
    if(folderkey == NULL) return -1;

    // change to root
    if(strcmp(folderkey,"/") == 0) folderkey = "myfiles";

    // user wants to navigate up a level
    if(strcmp(folderkey,"..") == 0)
    {
        // do several sanity checks to see if we're already at the root
        folder_curr = folder_get_key(mfshell->folder_curr);

        if(folder_curr == NULL) return 0;
        if(strcmp(folder_curr,"myfiles") == 0) return 0;

        folder_parent = folder_get_parent(mfshell->folder_curr);

        if(folder_parent == NULL) return 0;

        // it's pretty sure that we're not at the root
        folderkey = folder_parent;
    }

    // check the lenght of the key
    if(strlen(folderkey) != 13)
    {
        // as a folder moniker, "myfiles" is an exception
        if(strcmp(folderkey,"myfiles") != 0) return -1;
    }

    // create a new folder object to store the results
    folder_new = folder_alloc();

    // navigate to root is a special case
    if(strcmp(folderkey,"myfiles") == 0)
    {
        folder_set_key(folder_new,"myfiles");
        retval = 0;
    }
    else
    {
        retval = mfshell->folder_get_info(mfshell,
            folder_new,(char*)folderkey);
        mfshell->update_secret_key(mfshell);
    }

    if(retval == 0)
    {
        if(mfshell->folder_curr != NULL)
        {
            folder_free(mfshell->folder_curr);
            mfshell->folder_curr = NULL;
        }

        mfshell->folder_curr = folder_new;
    }
    else
    {
        folder_free(folder_new);
    }

    return retval;
}