#!/usr/bin/env bash

HOSTNAME=$(hostname)
DAY=$(date +%u)

RUN_DIR=/var/docker
BACKUP_DIR=vol
SOURCE=nextcloud
TARGET_DIR=/var/docker/tmp
PASSPHRASE=1234567890
EXT=tgz.gpg

RESTORE=vol/nextcloud/data/data/nextcloud.log

# Log-Datei schreiben.
#
# Die Ausgabe geht auch auf STDOUT, dadurch kann die vollständige Ausgabe,
# einschließlich Status- und Fehlermeldungen der Programme in ein erweitertes
# Log für die Fehlersuche umgeleitet werden.
#
# $1 - Typ, z.B. INFO, WARN, ERROR, etc.
# $2 ff. - die Meldung, die ins Log geschreiben wird
#
log() {
    local type=$1
    if [ "$type" == "ERROR" ]; then ERROR=0; fi
    shift 1
    echo "$(date '+%d.%m.%Y %H:%M:%S') - $type $@" | sudo tee -a $LOG_FILE

} 

# Ist $1 in der Liste der restlichen args $2, $3 ...
#
# zB. if is_in "foo" "foo" "bar" "foo bar" ; then ...
# Leere Liste liefert immer false
#
function is_in {
    local search="$1"
    shift 1
    local e
    for e in "$@"; do [[ "$e" == "$search" ]] && return 0; done
    return 1
}

# Alle Verzechnisnamen in einem Verzeichnis holen.
#
# $1 - Verzeichnis in dem gesucht wird als absoluter Pfad
# $2 ff. - auszuschliessende Verzeichnisse (kann leer bleiben)
#
function iterate_dirs_in() {
    local dirname
    local root=$1
    shift 1
    for dir in $(sudo find "$root" -maxdepth 1 -type d \! -wholename "$root"); do
        dirname=$(basename $dir)
        if ! is_in "$dirname" "$@"; then 
            echo "$dirname" 
        fi
    done
}

# create directory if it not exists
#
# $1 - dir to check
#
function check_directory() {
    local dir=$1
    if [ -d "$1" ]; then 
        return 0
    else
        mkdir -p "$1" && return 0
        sudo mkdir -p "$1" && return 0
        log ERROR "### could not create directory $1!"
        # no chance to recover
        exit 1
    fi
}

# Verzeichnis löschen
#
# Im Fehlerfall wird rc=1 zurückgegeben
#
# $1 - zu löschendes Verzeichnis
#
function delete_dir() {
    local dir=$1
    sudo rm -rf "$dir" && return 0
    log ERROR "### could not delete directory $1!"
    # return error, so caller can decide what to do
    return 1
}

# Slashes "/" im Pfadnamen durch Dashes "-" ersetzen, so dass der String als Dateiname verwendet werden kann.
#
# $1 - path 
function backup_file_prefix() {
    echo "$1" | sed -E 's/^\///' | sed -E 's/\//-/g'
}

# Verzeichnise in .tgz.gpg-Dateien sichern.
#
# $1 - Verzeichnis, das gesichert wird: alle Verzeichnisse darunter werden einzeln als .tgz.gpg-Datei gesichert
# $2 - Zielverzeichnis für .tgz.gpg-Dateien
# $3 ff. - Verzeichnisse, die nicht gesichert werden sollen (kann leer bleiben)
#
function backup_all_dirs() {
    local root=$1
    local target=$2
    local prefix=$(backup_file_prefix $root)
    local tar_file
    local dir
    shift 2

    for dir in $(iterate_dirs_in "$root" "$@"); do
        tar_file="$target/$prefix-$dir.$EXT"
        backup_dir "$root" "$tar_file" "$dir"
        list "$tar_file" "$dir"
        test_integrity "$tar_file"
    done
}

# Einzelnes Verzeichnis sichern.
#
# $1 - Pfad um Verzeichnis, das gesichert werden soll
# $2 - Zielpfad und -name für das Archiv
# $2 - zu sicherndes Verzeichnis
#
function backup_dir() {
    local root=$1
    local archive=$2
    local dir=$3
    log INFO "--- Backup $root/$dir -> $archive"
    sudo tar -c -z --numeric-owner --one-file-system --exclude "@eaDir" -C "$root" "$dir" | sudo gpg --batch -c --passphrase $PASSPHRASE -o "$archive"
    local rc=$?
    if [ "$rc" == "0" ] ; then
        log INFO "*** success"
    else
        log ERROR "### see full log"
    fi
}

# Inhalt des Archivs in eine Textdatei ausgeben.
#
# $1 - Archiv
#
function list() {
    local archive=$1
    log INFO "--- List $archive"
    sudo gpg --batch --decrypt --passphrase $PASSPHRASE "$archive" | sudo tar -tzv | sudo tee $archive.txt >/dev/null
    local rc=$?
    if [ "$rc" == "0" ] ; then
        log INFO "*** success"
    else
        log ERROR "### see full log"
    fi
}

# Integrität des Archivs testen, indem es entschlüsselt, entpackt 
# und der Inhalt auf /dev/null ausgegeben wird.
#
# $1 - Archiv
#
function test_integrity() {
    local archive=$1
    log INFO "--- Check integrity of $archive"
    sudo gpg --batch --decrypt --passphrase $PASSPHRASE "$archive" | sudo tar -xzO >/dev/null
    local rc=$?
    if [ "$rc" == "0" ] ; then
        log INFO "*** success"
    else
        log ERROR "### see full log"
    fi
}

# Restore aus Archiv
#
# Wird nach pwd ausgegeben!
#
# $1 - Archiv, ggf. mit Pfad
# $2 ff. - zurückzusichernde Dateien/Verzeichnisse
#
function restore() {
    local archive=$1
    shift 1
    sudo gpg --batch --decrypt --passphrase $PASSPHRASE "$archive" | sudo tar -xzv $@ >/dev/null
    local rc=$?
    if [ "$rc" == "0" ] ; then
        log INFO "*** success"
    else
        log ERROR "### see full log"
    fi
}


# *** NAS Test ***
function nas_test() {
    LOG_FILE="/volume1/nfs/Server/tmp/backup.log"

    log INFO "*** *** Begin NAS backup (data, nfs, media/books, media/music)"
    TARGET_DIR="/volume1/nfs/backups/tmp/backup.$DAY"
    EXCLUDE_DIRS=("@eaDir" "Temporary Items" "lost+found")
    delete_dir $TARGET_DIR # bei Fehler werden die Dateien hoffentlich überschrieben
    check_directory $TARGET_DIR
    # data
    backup_all_dirs "/volume1/data" "$TARGET_DIR" "${EXCLUDE_DIRS[@]}"

    EXCLUDE_DIRS=("@eaDir" "Temporary Items" "lost+found" backups)
    # nfs
    backup_all_dirs "/volume1/nfs" "$TARGET_DIR" "${EXCLUDE_DIRS[@]}"

    TARGET_DIR="/volume1/nfs/backups/tmp/media"
    EXCLUDE_DIRS=("@eaDir" "Temporary Items" "lost+found" serien tmp video "video.archive")
    check_directory $TARGET_DIR
    # media/books media/music
    backup_all_dirs "/volume1/media" "$TARGET_DIR" "${EXCLUDE_DIRS[@]}"

    log INFO "*** End of NAS backuip"
}


# *** NATHAN Test ***
function nathan_test() {
    LOG_FILE=/var/docker/tmp/backup.log

    log INFO "*** *** Begin nathan server backup"
    TARGET_DIR=/var/docker/tmp/backup.$DAY
    delete_dir $TARGET_DIR
    check_directory $TARGET_DIR

    backup_all_dirs "/var" "$TARGET_DIR" docker
    backup_all_dirs "/var/docker" "$TARGET_DIR" vol tmp
    backup_all_dirs "/var/docker/vol" "$TARGET_DIR"

    log INFO "*** End of nathan server backup"
}

# *** HANILLER Test ***
function hamiller_test() {
    LOG_FILE=/var/docker/tmp/backup.log

    log INFO "*** *** Begin hamiller server backup"
    TARGET_DIR=/var/docker/tmp/backup.$DAY
    delete_dir $TARGET_DIR
    check_directory $TARGET_DIR

    backup_all_dirs "/var" "$TARGET_DIR" # docker
#    backup_all_dirs "/var/docker" "$TARGET_DIR" vol tmp
#    backup_all_dirs "/var/docker/vol" "$TARGET_DIR"

    log INFO "*** End of hamiller server backup"
}

function test() {
    #LOG_FILE=./t1.log
    #log INFO "error test"
    echo "host:  #$1#"
}

#nas_test
#nathan_test
#hamiller_test
#test1

test "$HOSTNAME"

if [ ! -z $ERROR ]; then
  log ERROR "*** *** Errors occured during the progem run, see full log for details."
else
  log INFO "*** *** Program ended successfully." 
fi

exit



TARGET_DIR=/var/docker/tmp/two
echo "#"
echo "### gpg ###################################################"
echo "#"

date +%H:%M:%S.%N
echo "--- tar -c ------------------------------------------------"

cd $RUN_DIR

sudo tar -c -z --numeric-owner --one-file-system "$BACKUP_DIR/$SOURCE" | sudo gpg --batch -c --passphrase $PASSPHRASE -o "$TARGET_DIR/$SOURCE.tgz.gpg" 
date +%H:%M:%S.%N

echo "--- tar -t ------------------------------------------------"

cd $TARGET_DIR

sudo gpg --batch --decrypt --passphrase $PASSPHRASE "$TARGET_DIR/$SOURCE.tgz.gpg" 2>/dev/null | sudo tar -tz | sudo tee tar_list.txt >/dev/null
date +%H:%M:%S.%N

echo "--- tar -x ------------------------------------------------"

sudo gpg --batch --decrypt --passphrase $PASSPHRASE "$TARGET_DIR/$SOURCE.tgz.gpg" 2>/dev/null | sudo tar -xzv $RESTORE >/dev/null
date +%H:%M:%S.%N