/*-
 * Copyright (c) 2009-2015 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 <fnmatch.h>

#include "xbps_api_impl.h"

/**
 * @file lib/transaction_ops.c
 * @brief Transaction handling routines
 * @defgroup transaction Transaction 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.
 */
enum {
	TRANS_INSTALL = 1,
	TRANS_UPDATE,
	TRANS_REINSTALL
};

static int
trans_find_pkg(struct xbps_handle *xhp, const char *pkg, bool reinstall,
		bool hold)
{
	xbps_dictionary_t pkg_pkgdb = NULL, pkg_repod = NULL;
	xbps_array_t pkgs;
	const char *repoloc, *repopkgver, *instpkgver, *reason;
	char *pkgname;
	int action = 0, rv = 0;
	pkg_state_t state = 0;
	bool autoinst = false;

	assert(pkg != NULL);

	/*
	 * Find out if pkg is installed first.
	 */
	if ((pkgname = xbps_pkg_name(pkg))) {
		pkg_pkgdb = xbps_pkgdb_get_pkg(xhp, pkgname);
		free(pkgname);
	} else {
		pkg_pkgdb = xbps_pkgdb_get_pkg(xhp, pkg);
	}
	/*
	 * Find out if the pkg has been found in repository pool.
	 */
	if (pkg_pkgdb == NULL) {
		/* pkg not installed, perform installation */
		action = TRANS_INSTALL;
		reason = "install";
		if (((pkg_repod = xbps_rpool_get_pkg(xhp, pkg)) == NULL) &&
		    ((pkg_repod = xbps_rpool_get_virtualpkg(xhp, pkg)) == NULL)) {
			/* not found */
			return ENOENT;
		}
	} else {
		/* pkg installed, update or reinstall */
		if (!reinstall) {
			action = TRANS_UPDATE;
			reason = "update";
		} else {
			action = TRANS_REINSTALL;
			reason = "install";
		}
		if ((pkg_repod = xbps_rpool_get_pkg(xhp, pkg)) == NULL) {
			/* not found */
			return ENOENT;
		}
	}

	xbps_dictionary_get_cstring_nocopy(pkg_repod, "pkgver", &repopkgver);
	xbps_dictionary_get_cstring_nocopy(pkg_repod, "repository", &repoloc);

	if (action == TRANS_UPDATE) {
		/*
		 * Compare installed version vs best pkg available in repos
		 * for pkg updates.
		 */
		xbps_dictionary_get_cstring_nocopy(pkg_pkgdb,
		    "pkgver", &instpkgver);
		if (xbps_cmpver(repopkgver, instpkgver) <= 0 &&
		    !xbps_pkg_reverts(pkg_repod, instpkgver)) {
			xbps_dbg_printf(xhp, "[rpool] Skipping `%s' "
			    "(installed: %s) from repository `%s'\n",
			    repopkgver, instpkgver, repoloc);
			return EEXIST;
		}
	} else if (action == TRANS_REINSTALL) {
		/*
		 * For reinstallation check if installed version is less than
		 * or equal to the pkg in repos, if true, continue with reinstallation;
		 * otherwise perform an update.
		 */
		xbps_dictionary_get_cstring_nocopy(pkg_pkgdb, "pkgver", &instpkgver);
		if (xbps_cmpver(repopkgver, instpkgver) == 1) {
			action = TRANS_UPDATE;
			reason = "update";
		}
	}

	if (pkg_pkgdb) {
		/*
		 * If pkg is already installed, respect its automatic-install
		 * property.
		 */
		if (xbps_dictionary_get_bool(pkg_pkgdb, "automatic-install", &autoinst))
			xbps_dictionary_set_bool(pkg_repod, "automatic-install", autoinst);
	}
	/*
	 * Prepare transaction dictionary.
	 */
	if ((rv = xbps_transaction_init(xhp)) != 0)
		return rv;

	pkgs = xbps_dictionary_get(xhp->transd, "packages");
	/*
	 * Find out if package being updated matches the one already
	 * in transaction, in that case ignore it.
	 */
	if (action == TRANS_UPDATE) {
		if (xbps_find_pkg_in_array(pkgs, repopkgver, NULL)) {
			xbps_dbg_printf(xhp, "[update] `%s' already queued in "
			    "transaction.\n", repopkgver);
			return EEXIST;
		}
	}

	pkgname = xbps_pkg_name(repopkgver);
	assert(pkgname);
	/*
	 * Set package state in dictionary with same state than the
	 * package currently uses, otherwise not-installed.
	 */
	if ((rv = xbps_pkg_state_installed(xhp, pkgname, &state)) != 0) {
		if (rv != ENOENT) {
			free(pkgname);
			return rv;
		}
		/* Package not installed, don't error out */
		state = XBPS_PKG_STATE_NOT_INSTALLED;
	}
	if ((rv = xbps_set_pkg_state_dictionary(pkg_repod, state)) != 0) {
		free(pkgname);
		return rv;
	}

	if ((action == TRANS_INSTALL) && (state == XBPS_PKG_STATE_UNPACKED))
		reason = "configure";
	else if (state == XBPS_PKG_STATE_NOT_INSTALLED)
		reason = "install";
	else if ((action == TRANS_UPDATE) && hold)
		reason = "hold";

	/*
	 * Set transaction obj reason.
	 */
	if (!xbps_dictionary_set_cstring_nocopy(pkg_repod,
	    "transaction", reason)) {
		free(pkgname);
		return EINVAL;
	}
	if ((rv = xbps_transaction_store(xhp, pkgs, pkg_repod, false)) != 0) {
		free(pkgname);
		return rv;
	}
	free(pkgname);
	return 0;
}

int
xbps_transaction_update_packages(struct xbps_handle *xhp)
{
	xbps_object_t obj;
	xbps_object_iterator_t iter;
	bool newpkg_found = false;
	int rv = 0;

	if ((rv = xbps_pkgdb_init(xhp)) != 0)
		return rv;

	iter = xbps_dictionary_iterator(xhp->pkgdb);
	assert(iter);

	while ((obj = xbps_object_iterator_next(iter))) {
		xbps_dictionary_t pkgd;
		const char *pkgver;
		char *pkgname;
		bool hold = false;

		pkgd = xbps_dictionary_get_keysym(xhp->pkgdb, obj);
		xbps_dictionary_get_cstring_nocopy(pkgd, "pkgver", &pkgver);
		xbps_dictionary_get_bool(pkgd, "hold", &hold);
		if (hold) {
			xbps_dbg_printf(xhp, "[rpool] package `%s' "
			    "on hold, ignoring updates.\n", pkgver);
		}
		pkgname = xbps_pkg_name(pkgver);
		assert(pkgname);
		rv = trans_find_pkg(xhp, pkgname, false, hold);
		if (rv == 0) {
			newpkg_found = true;
		} else if (rv == ENOENT || rv == EEXIST || rv == ENODEV) {
			/*
			 * missing pkg or installed version is greater than or
			 * equal than pkg in repositories.
			 */
			rv = 0;
		}
		free(pkgname);
	}
	xbps_object_iterator_release(iter);

	return newpkg_found ? rv : EEXIST;
}

int
xbps_transaction_update_pkg(struct xbps_handle *xhp, const char *pkg)
{
	return trans_find_pkg(xhp, pkg, false, false);
}

int
xbps_transaction_install_pkg(struct xbps_handle *xhp, const char *pkg,
			     bool reinstall)
{
	return trans_find_pkg(xhp, pkg, reinstall, false);
}

int
xbps_transaction_remove_pkg(struct xbps_handle *xhp,
			    const char *pkgname,
			    bool recursive)
{
	xbps_dictionary_t pkgd;
	xbps_array_t pkgs, orphans, orphans_pkg, reqby;
	xbps_object_t obj;
	const char *pkgver;
	int rv = 0;

	assert(pkgname != NULL);

	if ((pkgd = xbps_pkgdb_get_pkg(xhp, pkgname)) == NULL) {
		/* pkg not installed */
		return ENOENT;
	}
	/*
	 * Prepare transaction dictionary and missing deps array.
	 */
	if ((rv = xbps_transaction_init(xhp)) != 0)
		return rv;

	pkgs = xbps_dictionary_get(xhp->transd, "packages");

	if (!recursive)
		goto rmpkg;
	/*
	 * If recursive is set, find out which packages would be orphans
	 * if the supplied package were already removed.
	 */
	if ((orphans_pkg = xbps_array_create()) == NULL)
		return ENOMEM;

	xbps_array_set_cstring_nocopy(orphans_pkg, 0, pkgname);
	orphans = xbps_find_pkg_orphans(xhp, orphans_pkg);
	xbps_object_release(orphans_pkg);
	if (xbps_object_type(orphans) != XBPS_TYPE_ARRAY)
		return EINVAL;

	for (unsigned int i = 0; i < xbps_array_count(orphans); i++) {
		obj = xbps_array_get(orphans, i);
		xbps_dictionary_get_cstring_nocopy(obj, "pkgver", &pkgver);
		xbps_dictionary_set_cstring_nocopy(obj, "transaction", "remove");
		if ((rv = xbps_transaction_store(xhp, pkgs, obj, false)) != 0)
			return EINVAL;
		xbps_dbg_printf(xhp, "%s: added into transaction (remove).\n", pkgver);
	}
	reqby = xbps_pkgdb_get_pkg_revdeps(xhp, pkgname);
	/*
	 * If target pkg is required by any installed pkg, the client must be aware
	 * of this to take appropiate action.
	 */
	if ((xbps_object_type(reqby) == XBPS_TYPE_ARRAY) &&
	    (xbps_array_count(reqby) > 0))
		rv = EEXIST;

	xbps_object_release(orphans);
	return rv;

rmpkg:
	/*
	 * Add pkg dictionary into the transaction pkgs queue.
	 */
	xbps_dictionary_get_cstring_nocopy(pkgd, "pkgver", &pkgver);
	xbps_dictionary_set_cstring_nocopy(pkgd, "transaction", "remove");
	if ((rv = xbps_transaction_store(xhp, pkgs, pkgd, false)) != 0)
		return EINVAL;
	xbps_dbg_printf(xhp, "%s: added into transaction (remove).\n", pkgver);
	reqby = xbps_pkgdb_get_pkg_revdeps(xhp, pkgver);
	/*
	 * If target pkg is required by any installed pkg, the client must be aware
	 * of this to take appropiate action.
	 */
	if ((xbps_object_type(reqby) == XBPS_TYPE_ARRAY) &&
	    (xbps_array_count(reqby) > 0))
		rv = EEXIST;

	return rv;
}

int
xbps_transaction_autoremove_pkgs(struct xbps_handle *xhp)
{
	xbps_array_t orphans, pkgs;
	xbps_object_t obj;
	const char *pkgver;
	int rv = 0;

	orphans = xbps_find_pkg_orphans(xhp, NULL);
	if (xbps_array_count(orphans) == 0) {
		/* no orphans? we are done */
		rv = ENOENT;
		goto out;
	}
	/*
	 * Prepare transaction dictionary and missing deps array.
	 */
	if ((rv = xbps_transaction_init(xhp)) != 0)
		goto out;

	pkgs = xbps_dictionary_get(xhp->transd, "packages");
	/*
	 * Add pkg orphan dictionary into the transaction pkgs queue.
	 */
	for (unsigned int i = 0; i < xbps_array_count(orphans); i++) {
		obj = xbps_array_get(orphans, i);
		xbps_dictionary_get_cstring_nocopy(obj, "pkgver", &pkgver);
		xbps_dictionary_set_cstring_nocopy(obj,
		    "transaction", "remove");
		xbps_array_add(pkgs, obj);
		xbps_dbg_printf(xhp, "%s: added (remove).\n", pkgver);
	}
out:
	if (orphans != NULL)
		xbps_object_release(orphans);

	return rv;
}