/*-
 * Copyright (c) 2009-2011 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 <dirent.h>
#include <libgen.h>
#include <sys/utsname.h>
#include <sys/stat.h>

#include <xbps_api.h>
#include "defs.h"

/*
 * Removes stalled pkg entries in repository's index.plist file, if any
 * binary package cannot be read (unavailable, not enough perms, etc).
 */
static int
remove_missing_binpkg_entries(const char *repodir)
{
	prop_array_t pkgarray;
	prop_dictionary_t idxd, pkgd;
	const char *filen;
	char *binpkg, *plist;
	size_t i;
	int rv = 0;
	bool found = false;

	plist = xbps_pkg_index_plist(repodir);
	if (plist == NULL)
		return -1;

	idxd = prop_dictionary_internalize_from_zfile(plist);
	if (idxd == NULL) {
		if (errno != ENOENT) {
			xbps_error_printf("xbps-repo: cannot read `%s': %s\n",
			    plist, strerror(errno));
			exit(EXIT_FAILURE);
		} else {
			free(plist);
			return 0;
		}
	}

again:
	pkgarray = prop_dictionary_get(idxd, "packages");
	if (prop_object_type(pkgarray) != PROP_TYPE_ARRAY)
		return -1;

	for (i = 0; i < prop_array_count(pkgarray); i++) {
		pkgd = prop_array_get(pkgarray, i);
		prop_dictionary_get_cstring_nocopy(pkgd, "filename", &filen);
		binpkg = xbps_xasprintf("%s/%s", repodir, filen);
		if (binpkg == NULL) {
			errno = ENOMEM;
			rv = -1;
			break;
		}
		if (access(binpkg, R_OK) == -1) {
			xbps_warn_printf("xbps-repo: `%s' unavailable, "
			    "removing entry from index... (%s)\n",
			    filen, strerror(errno));
			prop_array_remove(pkgarray, i);
			free(binpkg);
			found = true;
			goto again;
		}
		free(binpkg);
	}
	if (found) {
		prop_dictionary_set_uint64(idxd, "total-pkgs",
		    prop_array_count(pkgarray));
		prop_dictionary_set(idxd, "packages", pkgarray);
		if (!prop_dictionary_externalize_to_zfile(idxd, plist))
			rv = errno;
	}
	free(plist);

	return rv;
}

static prop_dictionary_t
repoidx_getdict(const char *pkgdir)
{
	prop_dictionary_t dict;
	prop_array_t array;
	char *plist;
	int rv;

	/*
	 * Remove entries in repositories index for unexistent
	 * packages, i.e dangling entries.
	 */
	if ((rv = remove_missing_binpkg_entries(pkgdir)) != 0)
		return NULL;

	plist = xbps_pkg_index_plist(pkgdir);
	if (plist == NULL)
		return NULL;

	dict = prop_dictionary_internalize_from_zfile(plist);
	if (dict == NULL) {
		dict = prop_dictionary_create();
		if (dict == NULL)
			goto out;

		array = prop_array_create();
		if (array == NULL) {
			prop_object_release(dict);
			goto out;
		}

		if (!prop_dictionary_set(dict, "packages", array)) {
			prop_object_release(dict);
			prop_object_release(array);
			goto out;
		}
		prop_object_release(array);
		if (!prop_dictionary_set_cstring_nocopy(dict,
		    "pkgindex-version", XBPS_PKGINDEX_VERSION)) {
			prop_object_release(dict);
			goto out;
		}
	}
out:
	free(plist);
	return dict;
}

static int
add_binpkg_to_index(prop_dictionary_t idxdict,
		    const char *filedir,
		    const char *file)
{
	prop_dictionary_t newpkgd, curpkgd;
	prop_array_t pkgar;
	struct stat st;
	const char *pkgname, *version, *regver, *oldfilen;
	char *sha256, *filen, *tmpfilen, *tmpstr, *oldfilepath;
	int rv = 0;

	if (idxdict == NULL || file == NULL)
		return EINVAL;

	tmpfilen = strdup(file);
	if (tmpfilen == NULL)
		return errno;

	filen = basename(tmpfilen);
	if (strcmp(tmpfilen, filen) == 0) {
		rv = EINVAL;
		goto out;
	}

	newpkgd = xbps_dictionary_metadata_plist_by_url(file, XBPS_PKGPROPS);
	if (newpkgd == NULL) {
		xbps_error_printf("xbps-repo: can't read %s %s metadata "
		    "file, skipping!\n", file, XBPS_PKGPROPS);
		goto out;
	}
	prop_dictionary_get_cstring_nocopy(newpkgd, "pkgname", &pkgname);
	prop_dictionary_get_cstring_nocopy(newpkgd, "version", &version);
	/*
	 * Check if this package exists already in the index, but first
	 * checking the version. If current package version is greater
	 * than current registered package, update the index; otherwise
	 * pass to the next one.
	 */
	curpkgd = xbps_find_pkg_in_dict_by_name(idxdict, "packages", pkgname);
	if (curpkgd == NULL) {
		if (errno && errno != ENOENT) {
			prop_object_release(newpkgd);
			rv = errno;
			goto out;
		}
	} else if (curpkgd) {
		prop_dictionary_get_cstring_nocopy(curpkgd, "version", &regver);
		if (xbps_cmpver(version, regver) <= 0) {
			xbps_warn_printf("skipping %s. %s-%s already "
			    "registered.\n", filen, pkgname, regver);
			prop_object_release(newpkgd);
			rv = EEXIST;
			goto out;
		}
		/*
		 * Current binpkg is newer than the one registered
		 * in package index, remove outdated binpkg file
		 * and its dictionary from the pkg index.
		 */
		prop_dictionary_get_cstring_nocopy(curpkgd,
		    "filename", &oldfilen);
		oldfilepath = xbps_xasprintf("%s/%s", filedir, oldfilen);
		if (oldfilepath == NULL) {
			prop_object_release(newpkgd);
			rv = errno;
			goto out;
		}
		if (remove(oldfilepath) == -1) {
			xbps_error_printf("xbps-repo: couldn't remove old "
			    "package file `%s': %s\n", oldfilepath,
			    strerror(errno));
			free(oldfilepath);
			prop_object_release(newpkgd);
			rv = errno;
			goto out;
		}
		free(oldfilepath);
		tmpstr = strdup(oldfilen);
		if (tmpstr == NULL) {
			prop_object_release(newpkgd);
			rv = errno;
			goto out;
		}
		if (!xbps_remove_pkg_from_dict_by_name(idxdict,
		    "packages", pkgname)) {
			xbps_error_printf("xbps-repo: couldn't remove `%s' "
			    "from plist index: %s\n", pkgname, strerror(errno));
			prop_object_release(newpkgd);
			free(tmpstr);
			goto out;
		}
		xbps_warn_printf("xbps-repo: removed outdated binpkg file for "
		    "'%s'.\n", tmpstr);
		free(tmpstr);
	}

	/*
	 * We have the dictionary now, add the required
	 * objects for the index.
	 */
	if (!prop_dictionary_set_cstring(newpkgd, "filename", filen)) {
		prop_object_release(newpkgd);
		rv = errno;
		goto out;
	}
	sha256 = xbps_file_hash(file);
	if (sha256 == NULL) {
		prop_object_release(newpkgd);
		rv = errno;
		goto out;
	}
	if (!prop_dictionary_set_cstring(newpkgd, "filename-sha256", sha256)) {
		prop_object_release(newpkgd);
		free(sha256);
		rv = errno;
		goto out;
	}
	free(sha256);
	if (stat(file, &st) == -1) {
		prop_object_release(newpkgd);
		rv = errno;
		goto out;
	}
	if (!prop_dictionary_set_uint64(newpkgd, "filename-size",
	    (uint64_t)st.st_size)) {
		prop_object_release(newpkgd);
		rv = errno;
		goto out;
	}
	/* Get package array in repo index file */
	pkgar = prop_dictionary_get(idxdict, "packages");
	if (pkgar == NULL) {
		prop_object_release(newpkgd);
		rv = errno;
		goto out;
	}
	/*
	 * Add dictionary into the index and update package count.
	 */
	if (!xbps_add_obj_to_array(pkgar, newpkgd)) {
		prop_object_release(newpkgd);
		rv = EINVAL;
		goto out;
	}
	printf("Registered %s-%s (%s) in package index.\n",
	    pkgname, version, filen);

	if (!prop_dictionary_set_uint64(idxdict, "total-pkgs",
	    prop_array_count(pkgar)))
		rv = errno;

out:
	if (tmpfilen)
		free(tmpfilen);

	return rv;
}

int
repo_genindex(const char *pkgdir)
{
	prop_dictionary_t idxdict = NULL;
	struct dirent *dp;
	DIR *dirp;
	uint64_t npkgcnt = 0;
	char *binfile, *plist;
	int rv = 0;
	bool registered_newpkgs = false, foundpkg = false;

	/*
	 * Create or read existing package index plist file.
	 */
	idxdict = repoidx_getdict(pkgdir);
	if (idxdict == NULL)
		return errno;

	plist = xbps_pkg_index_plist(pkgdir);
	if (plist == NULL) {
		prop_object_release(idxdict);
		return errno;
	}

	dirp = opendir(pkgdir);
	if (dirp == NULL) {
		xbps_error_printf("xbps-repo: cannot open `%s': %s\n",
		    pkgdir, strerror(errno));
		exit(EXIT_FAILURE);
	}

	while ((dp = readdir(dirp)) != NULL) {
		if ((strcmp(dp->d_name, ".") == 0) ||
		    (strcmp(dp->d_name, "..") == 0))
			continue;

		/* Ignore unknown files */
		if (strstr(dp->d_name, ".xbps") == NULL)
			continue;

		foundpkg = true;
		binfile = xbps_xasprintf("%s/%s", pkgdir, dp->d_name);
		if (binfile == NULL) {
			(void)closedir(dirp);
			rv = errno;
			goto out;
		}
		rv = add_binpkg_to_index(idxdict, pkgdir, binfile);
		free(binfile);
		if (rv == EEXIST) {
			rv = 0;
			continue;
		}
		else if (rv != 0) {
			(void)closedir(dirp);
			goto out;
		}
		registered_newpkgs = true;
	}
	(void)closedir(dirp);

	if (foundpkg == false) {
		/* No packages were found in directory */
		rv = ENOENT;
	} else {
		/*
		 * Show total count registered packages.
		 */
		prop_dictionary_get_uint64(idxdict, "total-pkgs", &npkgcnt);
		printf("%ju packages registered in package index.\n", npkgcnt);
		/*
		 * Don't write plist file if no packages were registered.
		 */
		if (registered_newpkgs == false)
			goto out;
		/*
		 * If any package was registered in package index, write
		 * plist file to storage.
		 */
		if (!prop_dictionary_externalize_to_zfile(idxdict, plist))
			rv = errno;
	}
out:
	free(plist);
	prop_object_release(idxdict);

	return rv;
}