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

#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fnmatch.h>
#include <dirent.h>
#include <assert.h>
#include <regex.h>

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

struct ffdata {
	bool rematch;
	const char *pat, *repouri;
	regex_t regex;
	xbps_array_t allkeys;
	xbps_dictionary_t filesd;
};

static void
match_files_by_pattern(xbps_dictionary_t pkg_filesd,
		       xbps_dictionary_keysym_t key,
		       struct ffdata *ffd,
		       const char *pkgver)
{
	xbps_array_t array;
	const char *keyname = NULL, *typestr = NULL;

	keyname = xbps_dictionary_keysym_cstring_nocopy(key);

	if (strcmp(keyname, "files") == 0)
		typestr = "regular file";
	else if (strcmp(keyname, "links") == 0)
		typestr = "link";
	else if (strcmp(keyname, "conf_files") == 0)
		typestr = "configuration file";
	else
		return;

	array = xbps_dictionary_get_keysym(pkg_filesd, key);
	for (unsigned int i = 0; i < xbps_array_count(array); i++) {
		xbps_object_t obj;
		const char *filestr = NULL, *tgt = NULL;

		obj = xbps_array_get(array, i);
		xbps_dictionary_get_cstring_nocopy(obj, "file", &filestr);
		if (filestr == NULL)
			continue;
		xbps_dictionary_get_cstring_nocopy(obj, "target", &tgt);
		if (ffd->rematch) {
			if (regexec(&ffd->regex, filestr, 0, 0, 0) == 0) {
				printf("%s: %s%s%s (%s)\n",
					pkgver, filestr,
					tgt ? " -> " : "",
					tgt ? tgt : "",
					typestr);
			}
		} else {
			if ((fnmatch(ffd->pat, filestr, FNM_PERIOD)) == 0) {
				printf("%s: %s%s%s (%s)\n",
					pkgver, filestr,
					tgt ? " -> " : "",
					tgt ? tgt : "",
					typestr);
			}
		}
	}
}

static int
ownedby_pkgdb_cb(struct xbps_handle *xhp,
		xbps_object_t obj,
		const char *obj_key UNUSED,
		void *arg,
		bool *done UNUSED)
{
	xbps_dictionary_t pkgmetad;
	xbps_array_t files_keys;
	struct ffdata *ffd = arg;
	const char *pkgver = NULL;

	(void)obj_key;
	(void)done;

	xbps_dictionary_get_cstring_nocopy(obj, "pkgver", &pkgver);
	pkgmetad = xbps_pkgdb_get_pkg_files(xhp, pkgver);
	if (pkgmetad == NULL)
		return 0;

	files_keys = xbps_dictionary_all_keys(pkgmetad);
	for (unsigned int i = 0; i < xbps_array_count(files_keys); i++) {
		match_files_by_pattern(pkgmetad,
		    xbps_array_get(files_keys, i), ffd, pkgver);
	}
	xbps_object_release(pkgmetad);
	xbps_object_release(files_keys);

	return 0;
}


static int
repo_match_cb(struct xbps_handle *xhp,
		xbps_object_t obj,
		const char *key UNUSED,
		void *arg,
		bool *done UNUSED)
{
	xbps_dictionary_t filesd;
	xbps_array_t files_keys;
	struct ffdata *ffd = arg;
	const char *pkgver = NULL;
	char *bfile;

	xbps_dictionary_set_cstring_nocopy(obj, "repository", ffd->repouri);
	xbps_dictionary_get_cstring_nocopy(obj, "pkgver", &pkgver);

	bfile = xbps_repository_pkg_path(xhp, obj);
	assert(bfile);
	filesd = xbps_archive_fetch_plist(bfile, "/files.plist");
	if (filesd == NULL) {
		xbps_dbg_printf(xhp, "%s: couldn't fetch files.plist from %s: %s\n",
		    pkgver, bfile, strerror(errno));
		return EINVAL;
	}
	files_keys = xbps_dictionary_all_keys(filesd);
	for (unsigned int i = 0; i < xbps_array_count(files_keys); i++) {
		match_files_by_pattern(filesd,
		    xbps_array_get(files_keys, i), ffd, pkgver);
	}
	xbps_object_release(files_keys);
	xbps_object_release(filesd);
	free(bfile);

	return 0;
}

static int
repo_ownedby_cb(struct xbps_repo *repo, void *arg, bool *done UNUSED)
{
	xbps_array_t allkeys;
	struct ffdata *ffd = arg;
	int rv;

	ffd->repouri = repo->uri;
	allkeys = xbps_dictionary_all_keys(repo->idx);
	rv = xbps_array_foreach_cb_multi(repo->xhp, allkeys, repo->idx, repo_match_cb, ffd);
	xbps_object_release(allkeys);

	return rv;
}

int
ownedby(struct xbps_handle *xhp, const char *pat, bool repo, bool regex)
{
	struct ffdata ffd;
	int rv;

	ffd.rematch = false;
	ffd.pat = pat;

	if (regex) {
		ffd.rematch = true;
		if (regcomp(&ffd.regex, ffd.pat, REG_EXTENDED|REG_NOSUB|REG_ICASE) != 0)
			return EINVAL;
	}
	if (repo)
		rv = xbps_rpool_foreach(xhp, repo_ownedby_cb, &ffd);
	else
		rv = xbps_pkgdb_foreach_cb(xhp, ownedby_pkgdb_cb, &ffd);

	if (regex)
		regfree(&ffd.regex);

	return rv;
}