/*-
 * 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 <fcntl.h>
#include <dirent.h>
#include <pthread.h>

#include "xbps_api_impl.h"

static xbps_dictionary_t
get_pkg_in_array(xbps_array_t array, const char *str, xbps_trans_type_t tt, bool virtual)
{
	xbps_object_t obj;
	xbps_object_iterator_t iter;
	xbps_trans_type_t ttype;
	bool found = false;

	assert(array);
	assert(str);

	iter = xbps_array_iterator(array);
	if (!iter)
		return NULL;

	while ((obj = xbps_object_iterator_next(iter))) {
		const char *pkgver = NULL;
		char pkgname[XBPS_NAME_SIZE] = {0};

		if (!xbps_dictionary_get_cstring_nocopy(obj, "pkgver", &pkgver)) {
			continue;
		}
		if (virtual) {
			/*
			 * Check if package pattern matches
			 * any virtual package version in dictionary.
			 */
			found = xbps_match_virtual_pkg_in_dict(obj, str);
			if (found)
				break;
		} else if (xbps_pkgpattern_version(str)) {
			/* match by pattern against pkgver */
			if (xbps_pkgpattern_match(pkgver, str)) {
				found = true;
				break;
			}
		} else if (xbps_pkg_version(str)) {
			/* match by exact pkgver */
			if (strcmp(str, pkgver) == 0) {
				found = true;
				break;
			}
		} else {
			if (!xbps_pkg_name(pkgname, sizeof(pkgname), pkgver)) {
				abort();
			}
			/* match by pkgname */
			if (strcmp(pkgname, str) == 0) {
				found = true;
				break;
			}
		}
	}
	xbps_object_iterator_release(iter);

	ttype = xbps_transaction_pkg_type(obj);
	if (found && tt && (ttype != tt)) {
		found = false;
	}
	if (!found) {
		errno = ENOENT;
		return NULL;
	}
	return obj;
}

xbps_dictionary_t HIDDEN
xbps_find_pkg_in_array(xbps_array_t a, const char *s, xbps_trans_type_t tt)
{
	assert(xbps_object_type(a) == XBPS_TYPE_ARRAY);
	assert(s);

	return get_pkg_in_array(a, s, tt, false);
}

xbps_dictionary_t HIDDEN
xbps_find_virtualpkg_in_array(struct xbps_handle *x,
			      xbps_array_t a,
			      const char *s,
			      xbps_trans_type_t tt)
{
	xbps_dictionary_t pkgd;
	const char *vpkg;

	assert(x);
	assert(xbps_object_type(a) == XBPS_TYPE_ARRAY);
	assert(s);

	if ((vpkg = vpkg_user_conf(x, s, false))) {
		if ((pkgd = get_pkg_in_array(a, vpkg, tt, true)))
			return pkgd;
	}

	return get_pkg_in_array(a, s, tt, true);
}

static xbps_dictionary_t
match_pkg_by_pkgver(xbps_dictionary_t repod, const char *p)
{
	xbps_dictionary_t d = NULL;
	const char *pkgver = NULL;
	char pkgname[XBPS_NAME_SIZE] = {0};

	assert(repod);
	assert(p);

	/* exact match by pkgver */
	if (!xbps_pkg_name(pkgname, sizeof(pkgname), p))
		return NULL;

	d = xbps_dictionary_get(repod, pkgname);
	if (d) {
		xbps_dictionary_get_cstring_nocopy(d, "pkgver", &pkgver);
		if (strcmp(pkgver, p)) {
			d = NULL;
			errno = ENOENT;
		}
	}

	return d;
}

static xbps_dictionary_t
match_pkg_by_pattern(xbps_dictionary_t repod, const char *p)
{
	xbps_dictionary_t d = NULL;
	const char *pkgver = NULL;
	char pkgname[XBPS_NAME_SIZE] = {0};

	assert(repod);
	assert(p);

	/* match by pkgpattern in pkgver */
	if (!xbps_pkgpattern_name(pkgname, sizeof(pkgname), p)) {
		if (xbps_pkg_name(pkgname, sizeof(pkgname), p)) {
			return match_pkg_by_pkgver(repod, p);
		}
		return NULL;
	}

	d = xbps_dictionary_get(repod, pkgname);
	if (d) {
		xbps_dictionary_get_cstring_nocopy(d, "pkgver", &pkgver);
		assert(pkgver);
		if (!xbps_pkgpattern_match(pkgver, p)) {
			d = NULL;
			errno = ENOENT;
		}
	}

	return d;
}

const char HIDDEN *
vpkg_user_conf(struct xbps_handle *xhp, const char *vpkg, bool only_conf)
{
	xbps_dictionary_t d;
	xbps_object_t obj;
	xbps_object_iterator_t iter;
	const char *pkg = NULL;
	bool found = false;

	assert(xhp);
	assert(vpkg);

	if (only_conf) {
		d = xhp->vpkgd_conf;
	} else {
		d = xhp->vpkgd;
		/* init pkgdb just in case to detect vpkgs */
		(void)xbps_pkgdb_init(xhp);
	}

	if (d == NULL)
		return NULL;

	iter = xbps_dictionary_iterator(d);
	assert(iter);

	while ((obj = xbps_object_iterator_next(iter))) {
		xbps_string_t rpkg;
		char buf[XBPS_NAME_SIZE] = {0};
		char *vpkgver = NULL, *vpkgname = NULL;
		const char *vpkg_conf = NULL;

		vpkg_conf = xbps_dictionary_keysym_cstring_nocopy(obj);
		rpkg = xbps_dictionary_get_keysym(xhp->vpkgd, obj);
		pkg = xbps_string_cstring_nocopy(rpkg);

		if (xbps_pkg_version(vpkg_conf)) {
			if (!xbps_pkg_name(buf, sizeof(buf), vpkg_conf)) {
				abort();
			}
			vpkgname = strdup(buf);
		} else {
			vpkgname = strdup(vpkg_conf);
		}
		assert(vpkgname);

		if (xbps_pkgpattern_version(vpkg)) {
			if (xbps_pkg_version(vpkg_conf)) {
				if (!xbps_pkgpattern_match(vpkg_conf, vpkg)) {
					free(vpkgname);
					continue;
				}
			} else {
				vpkgver = xbps_xasprintf("%s-999999_1", vpkg_conf);
				if (!xbps_pkgpattern_match(vpkgver, vpkg)) {
					free(vpkgver);
					free(vpkgname);
					continue;
				}
				free(vpkgver);
			}
		} else if (xbps_pkg_version(vpkg)) {
			if (!xbps_pkg_name(buf, sizeof(buf), vpkg)) {
				abort();
			}
			if (strcmp(buf, vpkgname)) {
				free(vpkgname);
				continue;
			}
		} else {
			if (strcmp(vpkg, vpkgname)) {
				free(vpkgname);
				continue;
			}
		}
		xbps_dbg_printf(xhp, "%s: vpkg_conf %s pkg %s vpkgname %s\n", __func__, vpkg_conf, pkg, vpkgname);
		free(vpkgname);
		found = true;
		break;
	}
	xbps_object_iterator_release(iter);

	return found ? pkg : NULL;
}

xbps_dictionary_t HIDDEN
xbps_find_virtualpkg_in_conf(struct xbps_handle *xhp,
			xbps_dictionary_t d,
			const char *pkg)
{
	xbps_dictionary_t pkgd;
	const char *vpkg;

	/* Try matching vpkg from configuration files */
	vpkg = vpkg_user_conf(xhp, pkg, true);
	if (vpkg != NULL) {
		if (xbps_pkgpattern_version(vpkg))
			pkgd = match_pkg_by_pattern(d, vpkg);
		else if (xbps_pkg_version(vpkg))
			pkgd = match_pkg_by_pkgver(d, vpkg);
		else
			pkgd = xbps_dictionary_get(d, vpkg);

		if (pkgd)
			return pkgd;
	}

	return NULL;
}

xbps_dictionary_t HIDDEN
xbps_find_virtualpkg_in_dict(struct xbps_handle *xhp,
			     xbps_dictionary_t d,
			     const char *pkg)
{
	xbps_object_t obj;
	xbps_object_iterator_t iter;
	xbps_dictionary_t pkgd = NULL;
	const char *vpkg;

	/* Try matching vpkg via xhp->vpkgd */
	vpkg = vpkg_user_conf(xhp, pkg, false);
	if (vpkg != NULL) {
		if (xbps_pkgpattern_version(vpkg))
			pkgd = match_pkg_by_pattern(d, vpkg);
		else if (xbps_pkg_version(vpkg))
			pkgd = match_pkg_by_pkgver(d, vpkg);
		else
			pkgd = xbps_dictionary_get(d, vpkg);

		if (pkgd)
			return pkgd;
	}
	/* ... otherwise match the first one in dictionary */
	iter = xbps_dictionary_iterator(d);
	assert(iter);

	while ((obj = xbps_object_iterator_next(iter))) {
		pkgd = xbps_dictionary_get_keysym(d, obj);
		if (xbps_match_virtual_pkg_in_dict(pkgd, pkg)) {
			xbps_object_iterator_release(iter);
			return pkgd;
		}
	}
	xbps_object_iterator_release(iter);

	return NULL;
}

xbps_dictionary_t HIDDEN
xbps_find_pkg_in_dict(xbps_dictionary_t d, const char *pkg)
{
	xbps_dictionary_t pkgd = NULL;

	if (xbps_pkgpattern_version(pkg))
		pkgd = match_pkg_by_pattern(d, pkg);
	else if (xbps_pkg_version(pkg))
		pkgd = match_pkg_by_pkgver(d, pkg);
	else
		pkgd = xbps_dictionary_get(d, pkg);

	return pkgd;
}