/*-
 * Licensed under the SPDX BSD-2-Clause identifier.
 * Use is subject to license terms, as specified in the LICENSE file.
 */

#include <sys/stat.h>
#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <dirent.h>
#include <libgen.h>
#include <assert.h>

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

static int
remove_pkg(const char *repodir, const char *file)
{
	char *filepath, *sigpath;
	int rv = 0;

	filepath = xbps_xasprintf("%s/%s", repodir, file);
	sigpath = xbps_xasprintf("%s.sig", filepath);
	if (remove(filepath) == -1) {
		if (errno != ENOENT) {
			rv = errno;
			fprintf(stderr, "xbps-rindex: failed to remove "
			    "package `%s': %s\n", file, strerror(rv));
		}
	}
	if (remove(sigpath) == -1) {
		if (errno != ENOENT) {
			rv = errno;
			fprintf(stderr, "xbps-rindex: failed to remove "
			    "package signature `%s': %s\n", sigpath, strerror(rv));
		}
	}
	free(sigpath);
	free(filepath);

	return rv;
}

static int
cleaner_cb(struct xbps_handle *xhp, xbps_object_t obj, const char *key UNUSED, void *arg, bool *done UNUSED)
{
	struct xbps_repo *repo = ((struct xbps_repo **)arg)[0], *stage = ((struct xbps_repo **)arg)[1];
	const char *binpkg;
	char *pkgver, *arch = NULL;
	int rv;

	binpkg = xbps_string_cstring_nocopy(obj);
	if (access(binpkg, R_OK) == -1) {
		if (errno == ENOENT) {
			if ((rv = remove_pkg(repo->uri, binpkg)) != 0)
				return 0;

			printf("Removed broken package `%s'.\n", binpkg);
		}
	}
	arch = xbps_binpkg_arch(binpkg);
	assert(arch);
	/* ignore pkgs from other archs */
	if (!xbps_pkg_arch_match(xhp, arch, NULL)) {
		free(arch);
		return 0;
	}
	free(arch);

	pkgver = xbps_binpkg_pkgver(binpkg);
	assert(pkgver);
	if (xhp->flags & XBPS_FLAG_VERBOSE)
		printf("checking %s (%s)\n", pkgver, binpkg);
	/*
	 * If binpkg is not registered in index, remove binpkg.
	 */
	if (!xbps_repo_get_pkg(repo, pkgver) && !(stage && xbps_repo_get_pkg(stage, pkgver))) {
		if ((rv = remove_pkg(repo->uri, binpkg)) != 0) {
			free(pkgver);
			return 0;
		}
		printf("Removed obsolete package `%s'.\n", binpkg);
	}
	free(pkgver);
	return 0;
}

int
remove_obsoletes(struct xbps_handle *xhp, const char *repodir)
{
	xbps_array_t array = NULL;
	struct xbps_repo *repos[2], *repo, *stage;
	DIR *dirp;
	struct dirent *dp;
	char *ext;
	int rv = 0;

	repo = xbps_repo_public_open(xhp, repodir);
	if (repo == NULL) {
		if (errno != ENOENT) {
			fprintf(stderr, "xbps-rindex: cannot read repository data: %s\n",
			    strerror(errno));
			return -1;
		}
		return 0;
	}
	stage = xbps_repo_stage_open(xhp, repodir);
	if (chdir(repodir) == -1) {
		fprintf(stderr, "xbps-rindex: cannot chdir to %s: %s\n",
		    repodir, strerror(errno));
		rv = errno;
		goto out;
	}
	if ((dirp = opendir(repodir)) == NULL) {
		fprintf(stderr, "xbps-rindex: failed to open %s: %s\n",
		    repodir, strerror(errno));
		rv = errno;
		goto out;
	}
	while ((dp = readdir(dirp))) {
		if (strcmp(dp->d_name, "..") == 0)
			continue;
		if ((ext = strrchr(dp->d_name, '.')) == NULL)
			continue;
		if (strcmp(ext, ".xbps"))
			continue;
		if (array == NULL)
			array = xbps_array_create();

		xbps_array_add_cstring(array, dp->d_name);
	}
	(void)closedir(dirp);

	repos[0] = repo;
	repos[1] = stage;
	rv = xbps_array_foreach_cb_multi(xhp, array, NULL, cleaner_cb, repos);
out:
	xbps_repo_release(repo);
	xbps_repo_release(stage);
	xbps_object_release(array);

	return rv;
}