/*-
 * Copyright (c) 2009-2011 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.h>
#include "xbps_api_impl.h"

/**
 * @file lib/repository_findpkg.c
 * @brief Repository package handling routines
 * @defgroup repo_pkgs Repository package handling functions
 *
 * The following image shows off the full transaction dictionary returned
 * by xbps_transaction_prepare().
 *
 * @image html images/xbps_transaction_dictionary.png
 *
 * Legend:
 *  - <b>Salmon bg box</b>: The transaction dictionary.
 *  - <b>White bg box</b>: mandatory objects.
 *  - <b>Grey bg box</b>: optional objects.
 *  - <b>Green bg box</b>: possible value set in the object, only one of them
 *    will be set.
 *
 * Text inside of white boxes are the key associated with the object, its
 * data type is specified on its edge, i.e string, array, integer, dictionary.
 */

static int
set_pkg_state(prop_dictionary_t pkgd, const char *pkgname)
{
	pkg_state_t state = 0;
	int rv = 0;

	assert(pkgd != NULL);

	rv = xbps_set_pkg_state_dictionary(pkgd, XBPS_PKG_STATE_NOT_INSTALLED);
	if (rv != 0)
		return rv;
	/*
	 * Overwrite package state in dictionary if it was unpacked
	 * previously.
	 */
	if ((rv = xbps_get_pkg_state_installed(pkgname, &state)) == 0) {
		if (state == XBPS_PKG_STATE_INSTALLED)
			return 0;
		if ((rv = xbps_set_pkg_state_dictionary(pkgd, state)) != 0)
			return rv;
	}
	/* pkg not installed, don't error out */
	if (rv == ENOENT)
		rv = 0;
	
	return rv;
}

static int
repository_find_pkg(const char *pattern, const char *reason)
{
	prop_dictionary_t pkg_repod = NULL, origin_pkgrd = NULL;
	prop_dictionary_t transd;
	prop_array_t mdeps, unsorted;
	const char *pkgname;
	int rv = 0;
	bool success, install, bypattern, bestpkg;

	assert(pattern != NULL);
	assert(reason != NULL);
	success = install = bypattern = bestpkg = false;

	if (strcmp(reason, "install") == 0) {
		/* install */
		install = true;
		bypattern = true;
		bestpkg = false;
	} else {
		/* update */
		pkg_repod = xbps_find_pkg_dict_installed(pattern, false);
		if (pkg_repod == NULL) {
			rv = ENODEV;
			goto out;
		}
		prop_object_release(pkg_repod);
		pkg_repod = NULL;
		bestpkg = true;
	}

	/*
	 * Find out if the pkg has been found in repository pool.
	 */
	pkg_repod = xbps_repository_pool_find_pkg(pattern,
	    bypattern, bestpkg);
	if (pkg_repod == NULL) {
		/* not found */
		rv = errno;
		errno = 0;
		goto out;
	}
	/*
	 * Prepare transaction dictionary and missing deps array.
	 */
	if ((transd = xbps_transaction_dictionary_get()) == NULL) {
		rv = EINVAL;
		goto out;
	}
	if ((mdeps = xbps_transaction_missingdeps_get()) == NULL) {
		rv = EINVAL;
		goto out;
	}

	origin_pkgrd = prop_dictionary_copy(pkg_repod);
	prop_dictionary_get_cstring_nocopy(pkg_repod, "pkgname", &pkgname);
	/*
	 * Check that this pkg hasn't been added previously into
	 * the transaction.
	 */
	if (install) {
		success = xbps_find_pkg_in_dict_by_pattern(transd,
		    "unsorted_pkgs", pattern);
	} else {
		success = xbps_find_pkg_in_dict_by_name(transd,
		    "unsorted_pkgs", pattern);
	}
	if (success) {
		xbps_dbg_printf("package '%s' already queued in transaction\n",
		    pattern);
		goto out;
	}
	/*
	 * Prepare required package dependencies and add them into the
	 * "unsorted" array in transaction dictionary.
	 */
	rv = xbps_repository_find_pkg_deps(transd, mdeps, origin_pkgrd);
	if (rv != 0)
		goto out;

	/*
	 * Set package state to the correct one.
	 */
	if ((rv = set_pkg_state(origin_pkgrd, pkgname)) != 0)
		goto out;

	/*
	 * Set trans-action obj in pkg dictionary to "install" or "update".
	 */
	if (!prop_dictionary_set_cstring_nocopy(origin_pkgrd,
	    "trans-action", reason)) {
		rv = EINVAL;
		goto out;
	}
	/*
	 * Add required package dictionary into the unsorted array.
	 */
	unsorted = prop_dictionary_get(transd, "unsorted_deps");
	if (unsorted == NULL) {
		rv = EINVAL;
		goto out;
	}
	/*
	 * Add the pkg dictionary from repository's index dictionary into
	 * the "unsorted" array in transaction dictionary.
	 */
	if (!prop_array_add(unsorted, origin_pkgrd)) {
		rv = errno;
		goto out;
	}

out:
	if (pkg_repod)
		prop_object_release(pkg_repod);
	if (origin_pkgrd)
		prop_object_release(origin_pkgrd);

	return rv;
}

int
xbps_repository_update_allpkgs(void)
{
	prop_dictionary_t dict;
	prop_object_t obj;
	prop_object_iterator_t iter;
	const char *pkgname;
	int rv = 0;
	bool newpkg_found = false;

	/*
	 * Prepare dictionary with all registered packages.
	 */
	dict = xbps_regpkgdb_dictionary_get();
	if (dict == NULL)
		return errno;

	iter = xbps_get_array_iter_from_dict(dict, "packages");
	if (iter == NULL) {
		rv = errno;
		xbps_regpkgdb_dictionary_release();
		return rv;
	}
	/*
	 * Find out if there is a newer version for all currently
	 * installed packages.
	 */
	while ((obj = prop_object_iterator_next(iter)) != NULL) {
		prop_dictionary_get_cstring_nocopy(obj, "pkgname", &pkgname);
		if ((rv = xbps_repository_update_pkg(pkgname)) != 0) {
			if (rv == ENOENT || rv == EEXIST) {
				/*
				 * missing pkg or installed version is
				 * greater than or equal than pkg
				 * in repositories.
				 */
				rv = 0;
				continue;
			}

			xbps_dbg_printf("[update-all] '%s' returned: %s\n",
			    pkgname, strerror(rv));
			break;
		}
		newpkg_found = true;
	}
	prop_object_iterator_release(iter);
	xbps_regpkgdb_dictionary_release();

	if (!newpkg_found)
		rv = ENXIO;

	return rv;
}

int
xbps_repository_update_pkg(const char *pkgname)
{
	return repository_find_pkg(pkgname, "update");
}

int
xbps_repository_install_pkg(const char *pkgpattern)
{
	return repository_find_pkg(pkgpattern, "install");
}