#!/bin/sh
#
# Copyright (C) 2012-2013  Etersoft
# Copyright (C) 2012-2013  Vitaly Lipatov <lav@etersoft.ru>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#

load_helper epm-install
load_helper epm-search

# for zypper before SUSE/11.0
__use_zypper_dry_run()
{
    a= zypper install --help 2>&1 | grep -q -- "--dry-run" && echo "--dry-run"
}

__use_yum_assumeno()
{
    a= yum --help 2>&1 | grep -q -- "--assumeno"
}

_epm_do_simulate()
{
    local CMD
    local filenames="$*"

    case $PMTYPE in
    	apt-rpm|apt-dpkg)
    		CMD="apt-get --simulate install"
    		;;
    	yum-rpm)
    		if __use_yum_assumeno ; then
    			LC_ALL=C sudocmd yum --assumeno install $filenames
    			# FIXME: check only error output
    			LC_ALL=C sudocmd yum --assumeno install $filenames 2>&1 | grep "^No package" && return 1
    			LC_ALL=C sudocmd yum --assumeno install $filenames 2>&1 | grep "^Complete!" && return 0
    			LC_ALL=C sudocmd yum --assumeno install $filenames 2>&1 | grep "^Exiting on user Command" && return 0
    			LC_ALL=C sudocmd yum --assumeno install $filenames >/dev/null 2>&1 || return
    		else
    			LC_ALL=C echo n | sudocmd yum install $filenames
    			# FIXME: check only error output
    			LC_ALL=C echo n | sudocmd yum install $filenames 2>&1 | grep "^No package" && return 1
    			LC_ALL=C echo n | sudocmd yum install $filenames 2>&1 | grep "^Complete!" && return 0
    			LC_ALL=C echo n | sudocmd yum install $filenames >/dev/null 2>&1 || return
    		fi
    		return 0 ;;
    	urpm-rpm)
    		CMD="urpmi --test --auto"
    		;;
    	zypper-rpm)
    		if ! __use_zypper_dry_run >/dev/null ; then
    			echo "zypper is too old: does not support --dry-run"
    			return
    		fi
    		CMD="zypper --non-interactive install"
    		;;
    	emerge)
    		echo "FIXME: Skip with emerge"
    		return ;;
    	pacman)
    		showcmd $SUDO pacman -v -S $filenames
    		echo no | $SUDO pacman -v -S $filenames
    		return ;;
    	slackpkg)
    		#docmd /usr/sbin/slackpkg -batch=on -default_answer=yes download
    		# just try search every package
    		# FIXME: epm_search have to return false status code if the package does not found
    		local pkg res
    		res=0
    		for pkg in $filenames ; do
    			pkg_filenames="$pkg-[0-9]" epm_search | grep -E "(installed|upgrade)" && continue
    			pkg_filenames="$pkg" epm_search | grep -E "(installed|upgrade)" && continue
    			res=1
    			echo "Does not found in repository."
    		done
    		return $res ;;
    	*)
    		fatal "Do not known simulate command for $PMTYPE"
    		;;
    esac

    sudocmd $CMD $filenames
}

epm_simulate()
{
    [ -z "$pkg_filenames" ] && echo "Skip empty list" && return 22

    local filenames="$(echo $pkg_filenames | filter_out_installed_packages)"

    [ -z "$filenames" ] && echo "All packages are already installed" && return 0

    _epm_do_simulate $filenames
    local RES=$?
    if [ -z "$quiet" ] ; then
        [ "$RES" = 0 ] && echo "Result: $filenames package(s) CAN BE installed" || echo "Result: There are PROBLEMS with install some package(s)"
    fi
    return $RES
}