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

#ifdef HAVE_STRCASESTR
# define _GNU_SOURCE    /* for strcasestr(3) */
#endif

#include "compat.h"

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

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

struct search_data {
	bool regex, repo_mode;
	regex_t regexp;
	unsigned int maxcols;
	const char *pat, *prop, *repourl;
	xbps_array_t results;
	char *linebuf;
};

static void
print_results(struct xbps_handle *xhp, struct search_data *sd)
{
	const char *pkgver = NULL, *desc = NULL;
	unsigned int align = 0, len;

	/* Iterate over results array and find out largest pkgver string */
	for (unsigned int i = 0; i < xbps_array_count(sd->results); i += 2) {
		xbps_array_get_cstring_nocopy(sd->results, i, &pkgver);
		if ((len = strlen(pkgver)) > align)
			align = len;
	}
	for (unsigned int i = 0; i < xbps_array_count(sd->results); i += 2) {
		xbps_array_get_cstring_nocopy(sd->results, i, &pkgver);
		xbps_array_get_cstring_nocopy(sd->results, i+1, &desc);

		if (sd->linebuf == NULL) {
			printf("[%s] %-*s %s\n",
				xbps_pkgdb_get_pkg(xhp, pkgver) ? "*" : "-",
				align, pkgver, desc);
			continue;
		}

		len = snprintf(sd->linebuf, sd->maxcols, "[%s] %-*s %s",
		    xbps_pkgdb_get_pkg(xhp, pkgver) ? "*" : "-",
		    align, pkgver, desc);
		/* add ellipsis if the line was truncated */
		if (len >= sd->maxcols && sd->maxcols > 4) {
			for (unsigned int j = 0; j < 3; j++)
				sd->linebuf[sd->maxcols-j-1] = '.';
			sd->linebuf[sd->maxcols] = '\0';
		}
		puts(sd->linebuf);
	}
}

static int
search_array_cb(struct xbps_handle *xhp UNUSED,
		xbps_object_t obj,
		const char *key UNUSED,
		void *arg,
		bool *done UNUSED)
{
	xbps_object_t obj2;
	struct search_data *sd = arg;
	const char *pkgver = NULL, *desc = NULL, *str = NULL;

	if (!xbps_dictionary_get_cstring_nocopy(obj, "pkgver", &pkgver))
		return 0;

	if (sd->prop == NULL) {
		bool vpkgfound = false;
		/* no prop set, match on pkgver/short_desc objects */
		xbps_dictionary_get_cstring_nocopy(obj, "short_desc", &desc);

		if (sd->repo_mode && xbps_match_virtual_pkg_in_dict(obj, sd->pat))
			vpkgfound = true;

		if (sd->regex) {
			if ((regexec(&sd->regexp, pkgver, 0, 0, 0) == 0) ||
			    (regexec(&sd->regexp, desc, 0, 0, 0) == 0)) {
				xbps_array_add_cstring_nocopy(sd->results, pkgver);
				xbps_array_add_cstring_nocopy(sd->results, desc);
			}
			return 0;
		}
		if (vpkgfound) {
			xbps_array_add_cstring_nocopy(sd->results, pkgver);
			xbps_array_add_cstring_nocopy(sd->results, desc);
		} else {
			if ((strcasestr(pkgver, sd->pat)) ||
			    (strcasestr(desc, sd->pat)) ||
			    (xbps_pkgpattern_match(pkgver, sd->pat))) {
				xbps_array_add_cstring_nocopy(sd->results, pkgver);
				xbps_array_add_cstring_nocopy(sd->results, desc);
			}
		}
		return 0;
	}
	/* prop set, match on prop object instead */
	obj2 = xbps_dictionary_get(obj, sd->prop);
	if (xbps_object_type(obj2) == XBPS_TYPE_ARRAY) {
		/* property is an array */
		for (unsigned int i = 0; i < xbps_array_count(obj2); i++) {
			xbps_array_get_cstring_nocopy(obj2, i, &str);
			if (sd->regex) {
				if (regexec(&sd->regexp, str, 0, 0, 0) == 0) {
					if (sd->repo_mode)
						printf("%s: %s (%s)\n", pkgver, str, sd->repourl);
					else
						printf("%s: %s\n", pkgver, str);
				}
			} else {
				if (strcasestr(str, sd->pat)) {
					if (sd->repo_mode)
						printf("%s: %s (%s)\n", pkgver, str, sd->repourl);
					else
						printf("%s: %s\n", pkgver, str);
				}
			}
		}
	} else if (xbps_object_type(obj2) == XBPS_TYPE_NUMBER) {
		/* property is a number */
		char size[8];

		if (xbps_humanize_number(size, xbps_number_integer_value(obj2)) == -1)
			exit(EXIT_FAILURE);

		if (sd->regex) {
			if (regexec(&sd->regexp, size, 0, 0, 0) == 0) {
				if (sd->repo_mode)
					printf("%s: %s (%s)\n", pkgver, size, sd->repourl);
				else
					printf("%s: %s\n", pkgver, size);
			}
		} else {
			if (strcasestr(size, sd->pat)) {
				if (sd->repo_mode)
					printf("%s: %s (%s)\n", pkgver, size, sd->repourl);
				else
					printf("%s: %s\n", pkgver, size);
			}
		}
	} else if (xbps_object_type(obj2) == XBPS_TYPE_BOOL) {
		/* property is a bool */
		if (sd->repo_mode)
			printf("%s: true (%s)\n", pkgver, sd->repourl);
		else
			printf("%s: true\n", pkgver);

	} else if (xbps_object_type(obj2) == XBPS_TYPE_STRING) {
		/* property is a string */
		str = xbps_string_cstring_nocopy(obj2);
		if (sd->regex) {
			if (regexec(&sd->regexp, str, 0, 0, 0) == 0) {
				if (sd->repo_mode)
					printf("%s: %s (%s)\n", pkgver, str, sd->repourl);
				else
					printf("%s: %s\n", pkgver, str);
			}
		} else {
			if (strcasestr(str, sd->pat)) {
				if (sd->repo_mode)
					printf("%s: %s (%s)\n", pkgver, str, sd->repourl);
				else
					printf("%s: %s\n", pkgver, str);
			}
		}
	}
	return 0;
}

static int
search_repo_cb(struct xbps_repo *repo, void *arg, bool *done UNUSED)
{
	xbps_array_t allkeys;
	struct search_data *sd = arg;
	int rv;

	if (repo->idx == NULL)
		return 0;

	sd->repourl = repo->uri;
	allkeys = xbps_dictionary_all_keys(repo->idx);
	rv = xbps_array_foreach_cb(repo->xhp, allkeys, repo->idx, search_array_cb, sd);
	xbps_object_release(allkeys);
	return rv;
}

int
search(struct xbps_handle *xhp, bool repo_mode, const char *pat, const char *prop, bool regex)
{
	struct search_data sd;
	int rv;

	sd.regex = regex;
	if (regex) {
		if (regcomp(&sd.regexp, pat, REG_EXTENDED|REG_NOSUB|REG_ICASE) != 0)
			return errno;
	}
	sd.repo_mode = repo_mode;
	sd.pat = pat;
	sd.prop = prop;
	sd.maxcols = get_maxcols();
	sd.results = xbps_array_create();
	sd.linebuf = NULL;
	if (sd.maxcols > 0) {
		sd.linebuf = malloc(sd.maxcols);
		if (sd.linebuf == NULL)
			exit(1);
	}

	if (repo_mode) {
		rv = xbps_rpool_foreach(xhp, search_repo_cb, &sd);
		if (rv != 0 && rv != ENOTSUP) {
			fprintf(stderr, "Failed to initialize rpool: %s\n",
			    strerror(rv));
			return rv;
		}
	} else {
		rv = xbps_pkgdb_foreach_cb(xhp, search_array_cb, &sd);
		if (rv != 0) {
			fprintf(stderr, "Failed to initialize pkgdb: %s\n",
			    strerror(rv));
			return rv;
		}
	}
	if (!prop && xbps_array_count(sd.results)) {
		print_results(xhp, &sd);
		xbps_object_release(sd.results);
	}
	if (regex)
		regfree(&sd.regexp);

	return rv;
}