#!/bin/bash
# 
# (C) dodger@ciberterminal.net
# 


# Exit codes:
#  1 : No config file
#  2 : Wrong option in the config file
#  3 : 
#  4 : 
#  5 : 
#  6 : 

########################################################################
#
# CONSTANTS
#
########################################################################

# colors
LIGHTGREEN="\033[1;32m"
LIGHTRED="\033[1;31m"
WHITE="\033[0;37m"
RESET="\033[0;00m"


########################################################################
#
# / CONSTANTS
#
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########################################################################
#
# VARIABLES
#
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MYDATE=$(date +%Y%m%d%H%M)
CONFIGFILE=/home/scripts/purge_files/purge_files.config
LOGDIR=$(dirname $0)/logs/

########################################################################
#
# / VARIABLES
#
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########################################################################
#
# FUNCTIONS
#
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usage()
{
    printf "%s${LIGHTRED}USAGE:${RESET}
    $0
    
    PLEASE READ
    https://sites.google.com/a/ciberterminal.net/sistemas/oracle/documentacion-tecnica/rotado-de-logs-y-trazas\n"
    # VERY INITIAL CHECKS
}

remove_files()
{
    local AUX=""
    local OPT="-${1}"
    local DIR="${2}"
    if [[ "${DIR,,}" = "dir" ]] ; then
        local TYPEOF="-type d"
        local FINDCMD="-print | xargs rm -fr"
        local MESSAGE="$(date +%Y%m%d%H%M%S) : Deleting folders inside ${FOLDER}, with filemask ${MASK}, ${OPT} ${PARAM1}"
    else
        local TYPEOF="-type f"
        local FINDCMD="-delete"
        local MESSAGE="$(date +%Y%m%d%H%M%S) : Deleting files on ${FOLDER}, with filemask ${MASK}, ${OPT} ${PARAM1}"
    fi
    
    [[ "${PARAM2}" ]] && AUX="-maxdepth ${PARAM2}" && MESSAGE="%s${MESSAGE} and maxdepth ${PARAM2}"
    printf "%s${MESSAGE}\n"
    eval find ${FOLDER} ${AUX} -name "${MASK}" ${TYPEOF} ${OPT} ${PARAM1} ${FINDCMD}
}

rotate_files()
{
    local USEZIP="$1"
    local MESSAGE="$(date +%Y%m%d%H%M%S) : Rotating files on ${FOLDER}, with filemask ${MASK}, -mtime ${PARAM1}"
    [[ "${PARAM2}" ]] && AUX="-maxdepth ${PARAM2}" && MESSAGE="${MESSAGE}, maxdepth ${PARAM2}"
    printf "%s${MESSAGE}\n"
#     printf "%s$(date +%Y%m%d%H%M%S) : Rotating files on ${FOLDER}, with filemask ${MASK}, -mtime ${PARAM1}"
#     [[ "${PARAM2}" ]] && AUX="-maxdepth ${PARAM2}" && printf "%s, maxdepth ${PARAM2}"
    
    case $USEZIP in
        "zip" )
            [[ ! "${PARAM3}" ]] && PARAM3="-9fv"
            local MOVECMD="gzip -c ${PARAM3}"
            local DSTFILE="${MYDATE}.gz"
            printf "%s and gzipping with ${PARAM3}\n"
        ;;
        "nozip" )
            local MOVECMD="cat"
            local DSTFILE="${MYDATE}"
            printf "%s\n"
        ;;
        * )
            printf "%s${LIGHTRED}ERROR ON rotate_files function${RESET}"
            return 1
        ;;
    esac
    while read FILE ; do
        echo ${FILE}
        ${MOVECMD} "${FILE}" > "${FILE}.${DSTFILE}"
         > ${FILE}
    done < <(find ${FOLDER} ${AUX} -name "${MASK}" -type f -size ${PARAM1^^})
}

########################################################################
#
# / FUNCTIONS
#
########################################################################


########################################################################
#
#  MAIN
#
########################################################################


[ ! -d ${LOGDIR} ] && mkdir -p ${LOGDIR}

exec 1>> ${LOGDIR}/$(basename $0 .sh)_${MYDATE}.log
exec 2>> ${LOGDIR}/$(basename $0 .sh)_${MYDATE}.err


if [ ! -f ${CONFIGFILE} ]; then
        echo "No configuration file found" 
        exit 1
fi



# workaround for eval "bug"
AUXDIR="/tmp/$(date +%s)"
mkdir ${AUXDIR}
cd ${AUXDIR}
#/ workaround for eval "bug"

while read LINE ; do


    if [[ ! "${LINE,,}" =~ ^\/[a-z0-9]{1,}\/[\.\/\_\ a-z0-9\-]{1,},[\*\.\_\ \#a-z0-9\-]{3,20},(dirbydate|dirbymin|bydate|bymin|rotate|rotatezip|zip),\+[0-9]{1,3}(|[kmg]),(|[0-9]{1,3}),(|\-[a-z0-9]{1,10})$ ]] ; then
        printf "%sskipping ${LINE}\nnot matching the config pattern, read instructions\n"
        continue
    fi
    
    FOLDER=$(echo $LINE | cut -d',' -f1)
    MASK=$(echo $LINE | cut -d',' -f2)
    ACTION=$(echo $LINE | cut -d',' -f3)
    PARAM1=$(echo $LINE | cut -d',' -f4)
    PARAM2=$(echo $LINE | cut -d',' -f5)
    PARAM3=$(echo $LINE | cut -d',' -f6)

    case ${ACTION,,} in
        "bydate" )
            remove_files mtime
        ;;
        "bymin" )
            remove_files mmin
        ;;
       "dirbydate" )
            remove_files mtime dir
        ;;
        "dirbymin" )
            remove_files mmin dir
        ;;
        "rotate" )
            rotate_files nozip
        ;;
        "rotatezip" )
            rotate_files zip
        ;;
        "zip" )
            printf "%s$(date +%Y%m%d%H%M%S) : Gzipping files on ${FOLDER}, with filemask ${MASK}, ${OPT} ${PARAM1}"
            [[ "${PARAM2}" ]] && AUX="-maxdepth ${PARAM2}" && printf "%s and maxdepth ${PARAM2}\n" || printf "%s\n"
            [[ ! "${PARAM3}" ]] && PARAM3="-9fv"
            find ${FOLDER} ${AUX} -name "${MASK}" -type f -mtime ${PARAM1} -exec gzip ${PARAM3} {} \;
        ;;
        * )
            usage
            exit 2
        ;;
    esac
    
done < <(cat ${CONFIGFILE} | egrep -v "^#|^$")



# workaround for eval "bug"
cd ${OLDPWD}
rm -fr ${AUXDIR}
#/ workaround for eval "bug"

########################################################################
#
# / MAIN
#
########################################################################