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/* Copyright (c) 2008, Tim Post <tinkertim@gmail.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the original program's authors nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/* NOTE:
 * This is a bit of an ugly hack, working around the absence of fstat / etc.
 * As more stuff is completed and exposed in libc, this will improve */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>

#include "errors.h"
#include "config.h"
#include "util.h"
#include "entry.h"
#include "ls.h"
#include "cmds.h"

static char *cmdname = "ls";

unsigned int ls_scope(const char *path)
{
    int fd;
    DIR *dirp;

    dirp = opendir(path);
    if (dirp) {
        closedir(dirp);
        return LS_DIR;
    }

    fd = open(path, O_RDONLY);
    if (fd > 0) {
        close(fd);
        return LS_FILE;
    }

    return LS_BOGUS;
}

void ls_print(const char *f)
{
    unsigned int scope;

    scope = ls_scope(f);

    /* If this function is called in a readdir loop, LS_BOGUS
     * can be treated as LS_FILE, since we aren't presenting
     * the full path to open(), just pointer->d_name as obtained
     * from opendir(). This will not happen if ../path/to/file
     * is passed, as may be the argument to ls */

    switch (scope) {
    case LS_DIR:
        printf("%-40s <DIR>\n", f);
        break;
    case LS_FILE:
        printf("%-40s\n", f);
        break;
    /* This is never reached unless in a readdir() loop */
    case LS_BOGUS:
        printf("%-40s\n", f);
        break;
    }
    return;
}

/* Dispays help for ls in various levels */
void * help_cmd_ls(unsigned int level)
{
    if (level == HELP_SHORT) {
        printf("`%s' lists files and directories.\n", cmdname);
    } else {
        help_cmd_ls(HELP_SHORT);
        printf("  `%s' [path], if no path is given the current "
                "working directory is used.\n", cmdname);
    }

    return CMD_VOID;
}

int * cmd_ls(char **argv)
{
    unsigned int argc;
    unsigned int scope;
    char *buff;

    DIR *dirp;
    struct dirent *dp;

    /* Count the arguments */
    for (argc = 0; argv[argc] != NULL; argc ++);

    if (argc > 2) {
        printf("%s - Too many arguments. Try `help %s extended'\n",
            cmdname, cmdname);
        return CMD_FAILURE;
    }

    buff = (char *) malloc(PATH_MAX);
    if (NULL == buff) {
        cli_error(CL_ENOMEM, "%s: ", cmdname);
        return CMD_FAILURE;
    }
    memset(buff, 0, sizeof(buff));

    if (argc == 1)
        getcwd(buff, PATH_MAX);
    else
        strncpy(buff, argv[1], PATH_MAX);

    scope = ls_scope(buff);

    switch (scope) {
    case LS_BOGUS:
        cli_error(CL_ENOENT, buff);
        free(buff);
        return CMD_FAILURE;
    case LS_FILE:
        ls_print(buff);
        break;
    case LS_DIR:
        dirp = opendir(buff);
        while ((dp = readdir(dirp)))
            ls_print(dp->d_name);
        closedir(dirp);
        break;
    }

    free(buff);

    return CMD_SUCCESS;
    
}