#!/bin/bash

function usage {
    echo -n "Usage: ${0}"
    echo -n " -L <log directory>"
    echo -n " [ -A <archive_logs_dir> (default /works/archive/logs)]"
    echo -n " [-D <older than time criteria> (default: '2 days ago')]"
    echo
    exit 1
}

echo Starting $0 $*

LogDir=${1}
LogArchiveDir=/works/archive/logs
DateCriteria="2 days ago"


# ---------------- cmdline
while getopts "A:L:D:" opt; do
  case ${opt} in
    A )
      LogArchiveDir=$OPTARG
      ;;
    L )
      LogDir=$OPTARG
      ;;
    D )
      DateCriteria=$OPTARG
      ;;
    \? )
      echo "Invalid option: -$OPTARG" >&2
      usage
      ;;
    : )
      echo "Option -$OPTARG requires an argument." >&2
      usage
      ;;
  esac
done
# ---------------- cmdline


if [ "${LogDir}" == "" ]
then
    usage
fi

Cmd="mkdir -p ${LogArchiveDir}"
echo ${Cmd} && eval ${Cmd}

echo "Looking for log files older than '${DateCriteria}' in ${LogDir}"

Oldest=$(date -d "${DateCriteria}" '+%Y-%m-%d %H:%M:%S')

Cmd="find ${LogDir}/ '(' -name '*.log' -o -name '*.log.*' ')'  -type f -not -newermt \"${Oldest}\""
echo $Cmd

files=$(eval ${Cmd})
if [ "$files" == "" ]
then
    echo "No files found older than ${Oldest} in ${LogDir}"
else
    echo Archiving files:
    echo -----------------
    echo ${files}

    oldest_file=$(ls -t ${files}  | tail -1)
    youngest_file=$(ls -tr ${files}  | tail -1)

    tstmp1=$(stat --printf '%y' ${oldest_file})
    tstmp2=$(stat --printf '%y' ${youngest_file})
    tmsig="$(date -d "${tstmp1}" +"%Y%m%d_%H%M%S")-$(date -d "${tstmp2}" +"%Y%m%d_%H%M%S")"
    echo $tmsig

    Cmd="tar zcvf ${LogArchiveDir}/${tmsig}.logs.tgz ${files}"
    echo $Cmd
    eval $Cmd

    rm $files
fi
echo Done ${0} ${*}