/*-
 * Copyright (c) 2008-2009 Juan Romero Pardines.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <libgen.h>
#include <unistd.h>

#include <xbps_api.h>

typedef struct repository_info {
	const char *index_version;
	const char *location_local;
	const char *location_remote;
	uint64_t total_pkgs;
} repo_info_t;

static bool sanitize_localpath(char *, const char *);
static prop_dictionary_t getrepolist_dict(const char *);
static bool pkgindex_getinfo(prop_dictionary_t, repo_info_t *);
static void usage(void);

static char *plist;

static void
usage(void)
{
	printf("Usage: xbps-bin [options] [action] [arguments]\n\n"
	" Available actions:\n"
        "    install, list, remove, repo-add, repo-list, repo-rm, search, show\n"
	" Actions with arguments:\n"
	"    install\t<pkgname>\n"
	"    remove\t<pkgname>\n"
	"    repo-add\t<URI>\n"
	"    repo-rm\t<URI>\n"
	"    search\t<string>\n"
	"    show\t<pkgname>\n"
	" Options shared by all actions:\n"
	"    -r\t\t<rootdir>\n"
	"\n"
	" Examples:\n"
	"    $ xbps-bin install klibc\n"
	"    $ xbps-bin -r /path/to/root install klibc\n"
	"    $ xbps-bin list\n"
	"    $ xbps-bin remove klibc\n"
	"    $ xbps-bin repo-add /path/to/directory\n"
	"    $ xbps-bin repo-add http://www.location.org/xbps-repo\n"
	"    $ xbps-bin repo-list\n"
	"    $ xbps-bin repo-rm /path/to/directory\n"
	"    $ xbps-bin search klibc\n"
	"    $ xbps-bin show klibc\n");
	exit(EXIT_FAILURE);
}

static bool
pkgindex_getinfo(prop_dictionary_t dict, repo_info_t *ri)
{
	assert(dict != NULL || ri != NULL);

	if (!prop_dictionary_get_cstring_nocopy(dict,
	    "pkgindex-version", &ri->index_version))
		return false;

	if (!prop_dictionary_get_cstring_nocopy(dict,
	    "location-local", &ri->location_local))
		return false;

	/* This one is optional, thus don't panic */
	prop_dictionary_get_cstring_nocopy(dict, "location-remote",
	    &ri->location_remote);

	if (!prop_dictionary_get_uint64(dict, "total-pkgs",
	    &ri->total_pkgs))
		return false;

	/* Reject empty repositories, how could this happen? :-) */
	if (ri->total_pkgs <= 0)
		return false;

	return true;
}

static prop_dictionary_t
getrepolist_dict(const char *root)
{
	prop_dictionary_t dict;

	xbps_set_rootdir(root);

	plist = xbps_append_full_path(true, NULL, XBPS_REPOLIST);
	if (plist == NULL)
		exit(EXIT_FAILURE);

	dict = prop_dictionary_internalize_from_file(plist);
	if (dict == NULL) {
		printf("ERROR: cannot find repository plist file (%s).\n",
		    strerror(errno));
		free(plist);
		exit(EXIT_FAILURE);
	}

	return dict;
}

static bool
sanitize_localpath(char *buf, const char *path)
{
	char *dirnp, *basenp, *dir, *base, *tmp;
	bool rv = false;

	dir = strdup(path);
	if (dir == NULL)
		return false;

	base = strdup(path);
	if (base == NULL) {
		free(dir);
		return false;
	}

	dirnp = dirname(dir);
	if (strcmp(dirnp, ".") == 0)
		goto out;

	basenp = basename(base);
	if (strcmp(basenp, base) == 0)
		goto out;

	tmp = strncpy(buf, dirnp, PATH_MAX - 1);
	if (sizeof(*tmp) >= PATH_MAX)
		goto out;

	buf[strlen(buf) + 1] = '\0';
	if (strcmp(dirnp, "/"))
		strncat(buf, "/", 1);
	strncat(buf, basenp, PATH_MAX - strlen(buf) - 1);
	rv = true;

out:
	free(dir);
	free(base);

	return rv;
}

int
main(int argc, char **argv)
{
	prop_dictionary_t dict;
	repo_info_t *rinfo = NULL;
	char dpkgidx[PATH_MAX], *root = NULL;
	int c, rv = 0;

	while ((c = getopt(argc, argv, "r:")) != -1) {
		switch (c) {
		case 'r':
			/* To specify the root directory */
			root = optarg;
			xbps_set_rootdir(root);
			break;
		case '?':
		default:
			usage();
		}
	}

	argc -= optind;
	argv += optind;

	if (argc < 1)
		usage();

	if (strcasecmp(argv[0], "repo-add") == 0) {
		/* Adds a new repository to the pool. */
		if (argc != 2)
			usage();

		if (!sanitize_localpath(dpkgidx, argv[1]))
			exit(EXIT_FAILURE);

		/* Temp buffer to verify pkgindex file. */
		plist = xbps_append_full_path(false, dpkgidx, XBPS_PKGINDEX);
		if (plist == NULL)
			exit(EXIT_FAILURE);

		dict = prop_dictionary_internalize_from_file(plist);
		if (dict == NULL) {
			printf("Directory %s does not contain any "
			    "xbps pkgindex file.\n", dpkgidx);
			free(plist);
			exit(EXIT_FAILURE);
		}

		rinfo = malloc(sizeof(*rinfo));
		if (rinfo == NULL) {
			prop_object_release(dict);
			free(plist);
			exit(EXIT_FAILURE);
		}

		if (!pkgindex_getinfo(dict, rinfo)) {
			printf("'%s' is incomplete.\n", plist);
			prop_object_release(dict);
			free(rinfo);
			free(plist);
			exit(EXIT_FAILURE);
		}

		if (!xbps_register_repository(dpkgidx)) {
			printf("ERROR: couldn't register repository (%s)\n",
			    strerror(errno));
			prop_object_release(dict);
			free(rinfo);
			free(plist);
			exit(EXIT_FAILURE);
		}

		printf("Added repository at %s (%s) with %ju packages.\n",
		       rinfo->location_local, rinfo->index_version,
		       rinfo->total_pkgs);

		prop_object_release(dict);
		free(rinfo);
		free(plist);

	} else if (strcasecmp(argv[0], "repo-list") == 0) {
		/* Lists all repositories registered in pool. */
		if (argc != 1)
			usage();

		dict = getrepolist_dict(root);
		(void)xbps_callback_array_iter_in_dict(dict,
		    "repository-list", xbps_list_strings_in_array, NULL);
		prop_object_release(dict);
		free(plist);

	} else if (strcasecmp(argv[0], "repo-rm") == 0) {
		/* Remove a repository from the pool. */
		if (argc != 2)
			usage();

		if (!sanitize_localpath(dpkgidx, argv[1]))
			exit(EXIT_FAILURE);

		if (!xbps_unregister_repository(dpkgidx)) {
			if (errno == ENODEV)
				printf("Repository '%s' not actually "
				    "registered.\n", dpkgidx);
			else
				printf("ERROR: couldn't unregister "
				    "repository (%s)\n", strerror(errno));
			exit(EXIT_FAILURE);
		}

	} else if (strcasecmp(argv[0], "search") == 0) {
		/* Search for a package by looking at short_desc. */
		if (argc != 2)
			usage();

		dict = getrepolist_dict(root);
		(void)xbps_callback_array_iter_in_dict(dict,
		    "repository-list", xbps_search_string_in_pkgs, argv[1]);
		prop_object_release(dict);
		free(plist);

	} else if (strcasecmp(argv[0], "show") == 0) {
		/* Shows info about a binary package. */
		if (argc != 2)
			usage();

		dict = getrepolist_dict(root);
		if (xbps_callback_array_iter_in_dict(dict, "repository-list",
		    xbps_show_pkg_info_from_repolist, argv[1]) != 0) {
			prop_object_release(dict);
			free(plist);
			printf("ERROR: unable to locate package '%s'.\n",
			    argv[1]);
			exit(EXIT_FAILURE);
		}
		prop_object_release(dict);
		free(plist);

	} else if (strcasecmp(argv[0], "list") == 0) {
		/* Lists packages currently registered in database. */
		if (argc != 1)
			usage();

		plist = xbps_append_full_path(true, NULL, XBPS_REGPKGDB);
		if (plist == NULL)
			exit(EXIT_FAILURE);

		dict = prop_dictionary_internalize_from_file(plist);
		if (dict == NULL) {
			printf("No packages currently registered.\n");
			free(plist);
			exit(EXIT_SUCCESS);
		}

		if (!xbps_callback_array_iter_in_dict(dict, "packages",
		    xbps_list_pkgs_in_dict, NULL)) {
			prop_object_release(dict);
			free(plist);
			exit(EXIT_FAILURE);
		}
		prop_object_release(dict);
		free(plist);

	} else if ((strcasecmp(argv[0], "install") == 0) ||
		   (strcasecmp(argv[0], "remove") == 0))  {
		/* Installs a binary package and required deps. */
		if (argc != 2)
			usage();

		if (geteuid() != 0) {
			printf("ERROR: root permissions are needed to install"
			    "and remove binary packages.\n");
			exit(EXIT_FAILURE);
		}

		/* Install into root directory by default. */
		if (strcasecmp(argv[0], "install") == 0) {
			rv = xbps_install_binary_pkg(argv[1], root);
			if (rv) {
				printf("ERROR: unable to install %s.\n", argv[1]);
				exit(rv);
			}
			printf("Package %s installed successfully.\n", argv[1]);
		} else {
			rv = xbps_remove_binary_pkg(argv[1], root);
			if (rv) {
				if (rv == ENOENT)
					printf("Package %s is not installed.\n",
					    argv[1]);
				else
					printf("ERROR: unable to remove %s.\n",
					    argv[1]);
				exit(rv);
			}
			printf("Package %s removed successfully.\n", argv[1]);
		}

	} else {
		usage();
	}

	exit(EXIT_SUCCESS);
}