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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.

 */

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <fcntl.h>

#include <dirent.h>

#include <assert.h>

#include <getopt.h>

#include "config.h"

#include "errors.h"

#include "util.h"

#include "entry.h"

#include "rm.h"

#include "cmds.h"

static char *cmdname = "rm";

#define RM_VERSION "0.0.1"

static rm_job_t rm;

static struct option const long_options[] = {

    { "help", no_argument, 0, 'h' },

    { "version", no_argument, 0, 'v' },

    { "recursive", no_argument, 0, 'r' },

    { "force", no_argument, 0, 'f' },

    { "safe", no_argument, 0, 's' },

    { 0, 0, 0, 0 }

};

static unsigned int rm_start(rm_job_t *rm)

{

    rm->recursive = 0;

    rm->force = 0;

    rm->safe = 0;

    /* Make sure we can allocate enough memory to store

     * what is needed in the job structure */

    if (NULL == (rm->nwd = (char *) malloc(PATH_MAX)))

        return 0;

    memset(rm->nwd, 0, sizeof(rm->nwd));

    if (NULL == (rm->owd = (char *) malloc(PATH_MAX)))

        return 0;

    memset(rm->owd, 0, sizeof(rm->owd));

    if (NULL == (rm->cwd = (char *) malloc(PATH_MAX)))

        return 0;

    memset(rm->cwd, 0, sizeof(rm->cwd));

    chdir(".");

    if (NULL == (getcwd(rm->owd, PATH_MAX)))

        return 0;

    return 1;

}

static void rm_end(rm_job_t *rm)

{

    if (NULL != rm->nwd)

        free(rm->nwd);

    if (NULL != rm->owd)

        free(rm->owd);

    if (NULL != rm->cwd)

        free(rm->cwd);

    return;

}

static unsigned int rm_recursive(const char *path)

{

    int rc;

    /* First see if it will just go away */

    rc = rmdir(path);

    if (rc == 0)

        return 0;

    /* Its not empty, recursively scan it */

    cli_error(CL_ENOTSUP,

        "Can not remove %s, directory not empty", path);

    return 1;

}

static unsigned int rm_single(const char *path)

{

    if (unlink(path)) {

        cli_error(CL_EFAIL, "rm: could not remove file %s", path);

        return 1;

    }

    return 0;

}

static unsigned int rm_scope(const char *path)

{

    int fd;

    DIR *dirp;

    dirp = opendir(path);

    if (dirp) {

        closedir(dirp);

        return RM_DIR;

    }

    fd = open(path, O_RDONLY);

    if (fd > 0) {

        close(fd);

        return RM_FILE;

    }

    return RM_BOGUS;

}

/* Dispays help for rm in various levels */

void * help_cmd_rm(unsigned int level)

{

    if (level == HELP_SHORT) {

        printf("`%s' removes files and directories.\n", cmdname);

    } else {

        help_cmd_rm(HELP_SHORT);

        printf(

        "Usage:  %s [options] <path>\n"

        "Options:\n"

        "  -h, --help       A short option summary\n"

        "  -v, --version    Print version information and exit\n"

        "  -r, --recursive  Recursively remove sub directories\n"

        "  -f, --force      Do not prompt prior to removing files\n"

        "  -s, --safe       Stop if directories change during removal\n\n"

        "Currently, %s is under development, some options don't work.\n",

        cmdname, cmdname);

    }

    return CMD_VOID;

}

/* Main entry point for rm, accepts an array of arguments */

int * cmd_rm(char **argv)

{

    unsigned int argc;

    unsigned int i, scope, ret = 0;

    int c, opt_ind;

    size_t len;

    char *buff = NULL;

    for (argc = 0; argv[argc] != NULL; argc ++);

    if (argc < 2) {

        cli_error(CL_EFAIL,

            "%s: insufficient arguments. Try %s --help", cmdname, cmdname);

        return CMD_FAILURE;

    }

    if (!rm_start(&rm)) {

        cli_error(CL_ENOMEM, "%s: could not initialize", cmdname);

        rm_end(&rm);

        return CMD_FAILURE;

    }

    for (c = 0, optind = 0, opt_ind = 0; c != -1;) {

        c = getopt_long(argc, argv, "hvrfs", long_options, &opt_ind);

        switch (c) {

        case 'h':

            help_cmd_rm(HELP_LONG);

            return CMD_SUCCESS;

        case 'v':

            printf("%s\n", RM_VERSION);

            return CMD_SUCCESS;

        case 'r':

            rm.recursive = 1;

            break;

        case 'f':

            rm.force = 1;

            break;

        case 's':

            rm.safe = 1;

            break;

        }

    }

    if (optind == argc) {

        cli_error(CL_EFAIL,

            "%s: insufficient arguments. Try %s --help", cmdname, cmdname);

        rm_end(&rm);

        return CMD_FAILURE;

    }

    i = optind;

    while (NULL != argv[i]) {

        len = strlen(argv[i]) + 2;

        buff = (char *) realloc(buff, len);

        assert(buff != NULL);

        memset(buff, 0, sizeof(buff));

        snprintf(buff, len, argv[i]);

        scope = rm_scope(buff);

        switch (scope) {

        case RM_BOGUS: /* FIXME */

        case RM_FILE:

            ret += rm_single(buff);

            break;

        case RM_DIR:

            if (! rm.recursive) {

                printf("%s is a directory, use -r to remove it.\n", buff);

                ret ++;

            } else {

                ret += rm_recursive(buff);

            }

            break;

        }

        i++;

    }

    if (NULL != buff)

        free(buff);

    rm_end(&rm);

    if (ret)

        return CMD_FAILURE;

    else

        return CMD_SUCCESS;

}