/*-
 * Copyright (c) 2012-2020 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 "xbps_api_impl.h"

static void
pkg_conflicts_trans(struct xbps_handle *xhp, xbps_array_t array,
		xbps_dictionary_t pkg_repod)
{
	xbps_array_t pkg_cflicts, trans_cflicts;
	xbps_dictionary_t pkgd, tpkgd;
	xbps_object_t obj;
	xbps_object_iterator_t iter;
	xbps_trans_type_t ttype;
	const char *cfpkg, *repopkgver, *repopkgname;
	char *buf;

	assert(xhp);
	assert(array);
	assert(pkg_repod);

	pkg_cflicts = xbps_dictionary_get(pkg_repod, "conflicts");
	if (xbps_array_count(pkg_cflicts) == 0) {
		return;
	}

	ttype = xbps_transaction_pkg_type(pkg_repod);
	if (ttype == XBPS_TRANS_HOLD || ttype == XBPS_TRANS_REMOVE) {
		return;
	}

	trans_cflicts = xbps_dictionary_get(xhp->transd, "conflicts");
	if (!xbps_dictionary_get_cstring_nocopy(pkg_repod, "pkgver", &repopkgver)) {
		return;
	}
	if (!xbps_dictionary_get_cstring_nocopy(pkg_repod, "pkgname", &repopkgname)) {
		return;
	}

	iter = xbps_array_iterator(pkg_cflicts);
	assert(iter);

	while ((obj = xbps_object_iterator_next(iter))) {
		const char *pkgver = NULL, *pkgname = NULL;

		cfpkg = xbps_string_cstring_nocopy(obj);

		/*
		 * Check if current pkg conflicts with an installed package.
		 */
		if ((pkgd = xbps_pkgdb_get_pkg(xhp, cfpkg)) ||
		    (pkgd = xbps_pkgdb_get_virtualpkg(xhp, cfpkg))) {
			/* If the conflicting pkg is on hold, ignore it */
			if (xbps_dictionary_get(pkgd, "hold"))
				continue;

			/* Ignore itself */
			if (!xbps_dictionary_get_cstring_nocopy(pkgd, "pkgname", &pkgname)) {
				break;
			}
			if (strcmp(pkgname, repopkgname) == 0) {
				continue;
			}
			if (!xbps_dictionary_get_cstring_nocopy(pkgd, "pkgver", &pkgver)) {
				break;
			}
			/*
			 * If there's a pkg for the conflict in transaction,
			 * ignore it.
			 */
			if ((tpkgd = xbps_find_pkg_in_array(array, pkgname, 0))) {
				ttype = xbps_transaction_pkg_type(tpkgd);
				if (ttype == XBPS_TRANS_INSTALL ||
				    ttype == XBPS_TRANS_UPDATE ||
				    ttype == XBPS_TRANS_REMOVE ||
				    ttype == XBPS_TRANS_HOLD) {
					continue;
				}
			}
			xbps_dbg_printf(xhp, "found conflicting installed "
			    "pkg %s with pkg in transaction %s "
			    "(matched by %s [trans])\n", pkgver, repopkgver, cfpkg);
			buf = xbps_xasprintf("CONFLICT: %s with "
			    "installed pkg %s (matched by %s)",
			    repopkgver, pkgver, cfpkg);
			if (!xbps_match_string_in_array(trans_cflicts, buf))
				xbps_array_add_cstring(trans_cflicts, buf);

			free(buf);
			continue;
		}
		/*
		 * Check if current pkg conflicts with any pkg in transaction.
		 */
		if ((pkgd = xbps_find_pkg_in_array(array, cfpkg, 0)) ||
		    (pkgd = xbps_find_virtualpkg_in_array(xhp, array, cfpkg, 0))) {
			/* ignore pkgs to be removed or on hold */
			ttype = xbps_transaction_pkg_type(pkgd);
			if (ttype == XBPS_TRANS_REMOVE || ttype == XBPS_TRANS_HOLD) {
				continue;
			}
			/* ignore itself */
			if (!xbps_dictionary_get_cstring_nocopy(pkgd, "pkgname", &pkgname)) {
				break;
			}
			if (strcmp(pkgname, repopkgname) == 0) {
				continue;
			}
			if (!xbps_dictionary_get_cstring_nocopy(pkgd, "pkgver", &pkgver)) {
				break;
			}
			xbps_dbg_printf(xhp, "found conflicting pkgs in "
			    "transaction %s <-> %s (matched by %s [trans])\n",
			    pkgver, repopkgver, cfpkg);
			buf = xbps_xasprintf("CONFLICT: %s with "
			   "%s in transaction (matched by %s)",
			   repopkgver, pkgver, cfpkg);
			if (!xbps_match_string_in_array(trans_cflicts, buf))
				xbps_array_add_cstring(trans_cflicts, buf);

			free(buf);
			continue;
		}
	}
	xbps_object_iterator_release(iter);
}

static int
pkgdb_conflicts_cb(struct xbps_handle *xhp, xbps_object_t obj,
		const char *key UNUSED, void *arg, bool *done UNUSED)
{
	xbps_array_t pkg_cflicts, trans_cflicts, pkgs = arg;
	xbps_dictionary_t pkgd;
	xbps_object_t obj2;
	xbps_object_iterator_t iter;
	xbps_trans_type_t ttype;
	const char *cfpkg, *repopkgver, *repopkgname;
	char *buf;
	int rv = 0;

	pkg_cflicts = xbps_dictionary_get(obj, "conflicts");
	if (xbps_array_count(pkg_cflicts) == 0)
		return 0;

	if (!xbps_dictionary_get_cstring_nocopy(obj, "pkgver", &repopkgver)) {
		return EINVAL;
	}
	if (!xbps_dictionary_get_cstring_nocopy(obj, "pkgname", &repopkgname)) {
		return EINVAL;
	}

	/* if a pkg is in the transaction, ignore the one from pkgdb */
	if (xbps_find_pkg_in_array(pkgs, repopkgname, 0)) {
		return 0;
	}

	trans_cflicts = xbps_dictionary_get(xhp->transd, "conflicts");
	iter = xbps_array_iterator(pkg_cflicts);
	assert(iter);

	while ((obj2 = xbps_object_iterator_next(iter))) {
		const char *pkgver = NULL, *pkgname = NULL;

		cfpkg = xbps_string_cstring_nocopy(obj2);
		if ((pkgd = xbps_find_pkg_in_array(pkgs, cfpkg, 0)) ||
		    (pkgd = xbps_find_virtualpkg_in_array(xhp, pkgs, cfpkg, 0))) {
			/* ignore pkgs to be removed or on hold */
			ttype = xbps_transaction_pkg_type(pkgd);
			if (ttype == XBPS_TRANS_REMOVE || ttype == XBPS_TRANS_HOLD) {
				continue;
			}
			/* ignore itself */
			if (!xbps_dictionary_get_cstring_nocopy(pkgd, "pkgname", &pkgname)) {
				rv = EINVAL;
				break;
			}
			if (strcmp(pkgname, repopkgname) == 0) {
				continue;
			}
			if (!xbps_dictionary_get_cstring_nocopy(pkgd, "pkgver", &pkgver)) {
				rv = EINVAL;
				break;
			}
			xbps_dbg_printf(xhp, "found conflicting pkgs in "
			    "transaction %s <-> %s (matched by %s [pkgdb])\n",
			    pkgver, repopkgver, cfpkg);
			buf = xbps_xasprintf("CONFLICT: %s with "
			   "%s in transaction (matched by %s)",
			   repopkgver, pkgver, cfpkg);
			if (!xbps_match_string_in_array(trans_cflicts, buf))
				xbps_array_add_cstring(trans_cflicts, buf);

			free(buf);
			continue;
		}
	}
	xbps_object_iterator_release(iter);
	return rv;
}

bool HIDDEN
xbps_transaction_check_conflicts(struct xbps_handle *xhp, xbps_array_t pkgs)
{
	xbps_array_t array;
	unsigned int i;

	/* find conflicts in transaction */
	for (i = 0; i < xbps_array_count(pkgs); i++) {
		pkg_conflicts_trans(xhp, pkgs, xbps_array_get(pkgs, i));
	}
	/* find conflicts in pkgdb */
	if (xbps_pkgdb_foreach_cb_multi(xhp, pkgdb_conflicts_cb, pkgs) != 0) {
		return false;
	}

	array = xbps_dictionary_get(xhp->transd, "conflicts");
	if (xbps_array_count(array) == 0) {
		xbps_dictionary_remove(xhp->transd, "conflicts");
	}
	return true;
}