#! /usr/bin/env bash

# Copyright � 2005-2016 The Backup Manager Authors
# See the AUTHORS file for details.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

# This is the main backup-manager script. 
#
# $Revision$
# $Date$
# $Author$

set -e

RELEASE="true"
VERSION="0.7.14"

# All the paths we provide
libdir=/usr/share/backup-manager
vardir=/usr/var
bindir=/usr/bin
bmu="$bindir/backup-manager-upload"
bmp="$bindir/backup-manager-purge"

# Find which lockfile to use
# If we are called by an unprivileged user, use a lockfile inside the user's home;
# else, use /var/run/backup-manager.lock
systemlockfile="/var/run/backup-manager.lock"
userlockfile="$HOME/.backup-manager.lock"
if [[ "$UID" != 0 ]]; then
    lockfile="$userlockfile"
else
    lockfile="$systemlockfile"
fi

# Default value for logger, as we didn't read the config file yet
BM_LOGGER_LEVEL="info"

# Load the backup-manager's library
source $libdir/externals.sh
source $libdir/gettext.sh
source $libdir/logger.sh
source $libdir/dialog.sh
source $libdir/files.sh
source $libdir/md5sum.sh
source $libdir/backup-methods.sh
source $libdir/upload-methods.sh
source $libdir/burning-methods.sh
source $libdir/actions.sh
source $libdir/dbus.sh
debug "Libraries loaded successfuly from \"$libdir\"."

# Initialize defautls values of arguments
verbosedebug="false"
verbose="false"
version="false"
warnings="true"
force="false"
upload="false"
burn="false"
help="false"
md5check="false"
purge="false"
conffile="/etc/backup-manager.conf"

# The "no" flags
nopurge="false"
noburn="false"
noupload="false"

debug "Version : $VERSION"

# Set useful global variables and initial
# checks
bm_init_today
bm_dbus_init

bm_dbus_send_event "startup" "Version : $VERSION"
bm_dbus_send_progress 0 "Initializing"

# Catch signals for a nice exit.
trap clean_exit SIGINT SIGTERM SIGKILL

# Parse the command line 
debug "Processing the command line"
while [[ $# -ge 1 ]]; do
    case $1 in
        -h|--help)
            usage
        ;;
        -m|--md5check) 
            md5check="true"
        ;;
        -p|--purge)
            purge="true"
        ;;
        --no-purge)
            nopurge="true"
        ;;
        -b|--burn) 
            burn="true"
            # parse the second argument as a date if
            # it does not begin with a dash (-).
            if [[ -n "$2" ]] && 
               [[ "${2}" == "${2#-}" ]]; then
                # test if the date is a valid date
                if [[ $(echo "$2" | grep "^[[:digit:]]\{8\}$") ]] ; then
                    export BM__BURNING_DATE="$2"
                    shift
                else
                    error "The -b option must be followed by a valid date (YYYYMMDD)."
                fi
            fi
        ;;
        --no-burn)
            noburn="true"
        ;;
        -u|--upload)
            upload="true"
        ;;
        --no-upload)
            noupload="true"
        ;;
        -d|--debug)
            verbosedebug="true"
            verbose="true"
        ;;
        -v|--verbose)
            verbose="true"
        ;;
        --version)
           echo "Backup Manager $VERSION"
            _exit 0
        ;;
        --no-warnings)
            warnings="false"
        ;;
        -f|--force)
            force="true"
        ;;
        -c|--conffile)
            # in this case, $2 should be the conffile !
            if [[ -f $2 ]]; then
                conffile=$2
            else
                error "The -c option must be followed by an existing filename."
                usage
            fi
            # we shift here to avoid processing the file path 
            shift
        ;;
        *)  
            echo "Unknown option $1"
            usage
            break
        ;;
    esac
    shift
done
info "Backup Manager $VERSION - Copyright (c) 2004-2016 Alexis Sukrieh"

# Display some more info if we're doing an action
if [[ "$noupload" == "true" ]]\
|| [[ "$noburn" == "true" ]]\
|| [[ "$nopurge" == "false" ]]; then
    curr_time=`date +%Y-%m-%d%t%T`
    info "Process started at $curr_time"
fi

debug "Loading configuration file : \"$conffile\"."
source $conffile

# Override config's log level if specified by command line
if [[ "$verbose" == "true" ]]; then
    if [[ "$verbosedebug" == "true" ]]; then
        BM_LOGGER_LEVEL="debug"
    else
        BM_LOGGER_LEVEL="info"
    fi
fi
if [[ "$warnings" == "false" ]]; then
    BM_LOGGER_LEVEL="error"
fi

# Sanitize will try to find deprecated vartiables
debug "Sanitizing the configuration file."
source $libdir/sanitize.sh

debug "Initializing environment"
bm_init_env

debug "Checking if logger is available"
check_logger

debug "Getting lock"
get_lock
check_filetypes

# For security reasons, change the umask
# for the backup-manager session.
# Every file created by the process will be -rw------
BM_UMASK=$(umask)
umask 0077

debug "Running pre-command"
exec_pre_command || error "Unable to exec the pre-command"

create_directories

if [[ "$upload" == "true" ]]; then
    debug "Running the upload methods"
    upload_files
    _exit 0
fi

if [[ "$burn" == "true" ]]; then
    debug "Running the burning methods"
    burn_files
    _exit 0
fi

if [[ "$md5check" == "true" ]]; then
    debug "Runing the MD5 checks"
    check_cdrom_md5_sums
    _exit 0
fi

if [[ "$purge" == "true" ]]; then
    debug "Purging the repository"
    clean_repositories
    _exit 0
fi

# Default process : doing everything unless --no-flags 
# are given.

if [[ "$nopurge" != "true" ]]; then
    debug "Purging the repository"
    bm_dbus_send_progress 10 "Cleaning repositories"
    clean_repositories
fi

debug "Building archives"
bm_dbus_send_progress 20 "Building archives"
make_archives

if [[ "$noupload" != "true" ]]; then
    debug "Running the upload methods"
    bm_dbus_send_progress 60 "Uploading backups"
    upload_files
fi

if [[ "$noburn" != "true" ]]; then
    debug "Running the burning methods"
    bm_dbus_send_progress 80 "Burning backups"
    burn_files
fi

debug "Running post-command"
bm_dbus_send_progress 90 "Cleaning up"
exec_post_command || error "Unable to exec post-command."

debug "Releasing lock"
release_lock

debug "Exiting"
umask $BM_UMASK >/dev/null

curr_time=`date +%Y-%m-%d%t%T`
info "Process finished at $curr_time"

bm_dbus_send_progress 100 "Finished"
bm_dbus_send_event "shutdown" "0"
exit 0