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#!/bin/bash
###################################################################################################
# .drive-compute-object-size
###################################################################################################
# Copyright 2017-2022 Jean-Christophe Manciot <jcmanciot@sdxlive.com>
#
# Licensed under a GPLv3 License; you may not use this file except in compliance with the License. 
# You may obtain a copy of the License at
#
#    https://www.gnu.org/licenses/gpl-3.0.md
#
# The licensor cannot revoke these freedoms as long as you follow the license terms.
#
# Attribution — You must give appropriate credit, provide a link to the license, and indicate if 
#               changes were made. You may do so in any reasonable manner, but not in any way that 
#               suggests the licensor endorses you or your use.
###################################################################################################

###################################################################################################
#
# Compute the size in bytes of a file/folder name containing its size expressed as a floating point
# number followed by its unit:
#
#       - B:  bytes
#       - KB: kilobytes
#       - MB: megabytes
#       - GB: gigabytes
#       - TB: terabytes
#       - PB: petabytes
#       - EB: exabytes
#       - ZB: zettabytes
#       - YB: yottabytes
#
###################################################################################################
#
# Requirements:
# ------------
#
# - We assume that:
#       + bc, coreutils, perl-base & zenity packages are already installed.
#
###################################################################################################
#
# Parameter:
# ---------
#
# - <object>: file/folder name with the following format:
#             <object_type> <object_size> <objezct_name>
#
###################################################################################################
#
# Returned value:
# --------------
#
# - <object_size>: size of the object converted in bytes
#
###################################################################################################
#
# Usage example:
# -------------
#
# object_size=$(.drive-compute-object-size "$object")
#
###################################################################################################
if [[ $LOG_DRIVE_COMPUTE_OBJECT_SIZE == ON ]]; then
        # Getting the last existing file descriptor of ~/.drive-google/logs/drive-google.log
        fd=$(ls -al /proc/$$/fd | grep ~/.drive-google/logs/drive-google.log | sed -E 's|^.* ([0-9]+) -> .*$|\1|g' | sort -V | tail -n 1)

        # Case where fd is unset, i.e the file ~/.drive-google/logs/drive-google.log has not yet been opened
        if [[ -z $fd ]]; then
                lowest_unused_fd () 
                {
                        local fd=0
                        while [ -e /proc/$$/fd/${fd} ]; do
                                fd=$((fd+1))
                        done
                        echo $fd
                }
                fd=$(lowest_unused_fd)

                # Opening ~/.drive-google/logs/drive-google.log as file descriptor $fd for appending
                eval "exec $fd>> ~/.drive-google/logs/drive-google.log"
        fi

        # Writing the trace output generated when set -x is enabled to file descriptor $fd 
        eval "BASH_XTRACEFD=$fd"
        # Logging line numbers - We could also use ${0} for ${BASH_SOURCE}
        BASH_SOURCE_BASENAME=$(basename ${BASH_SOURCE})
        export PS4='${BASH_SOURCE_BASENAME}.${LINENO}+ '
        # Expanding all variables and prints the full commands before output of the command
        set -x
fi

# Preventing globbing (pathname expansion)
set -o noglob
# Allowing extended globbing
shopt -s extglob
# Expanding aliases
shopt -s expand_aliases

# Including alias definitions to sed/grep/awk/perl commands for readability sake
. /usr/include/drive-google/aliases

object="$1"

# Getting object size with perl: sed does not recognize the non-greedy quantifier '?'
object_size_with_multiplier=$(echo "$object" | extract_object_size)

# Getting object size multiplier with perl: sed does not recognize the non-greedy quantifier '?'
multiplier=$(echo "$object_size_with_multiplier" | extract_object_size_multiplier)

if [[ ! ("$multiplier" =~ [0-9]B) ]]; then
        # Removing $multiplier from $object_size_with_multiplier
        object_size_base=${object_size_with_multiplier%$multiplier}
else
        # Removing $multiplier from $object_size_with_multiplier
        object_size_base=${object_size_with_multiplier%B}
fi

# Going far just for fun :-)
case $multiplier in
        [0-9]B)
                object_size=$(LC_ALL=C printf '%.0f' "$object_size_base")
                ;;
        KB)
                floating_object_size=$(echo "${object_size_base}*1024" | bc)
                object_size=$(LC_ALL=C printf '%.0f' "$floating_object_size")
                ;;
        MB)
                floating_object_size=$(echo "${object_size_base}*(1024^2)" | bc)
                object_size=$(LC_ALL=C printf '%.0f' "$floating_object_size")
                ;;
        GB)
                floating_object_size=$(echo "${object_size_base}*(1024^3)" | bc)
                object_size=$(LC_ALL=C printf '%.0f' "$floating_object_size")
                ;;
        TB)
                floating_object_size=$(echo "${object_size_base}*(1024^4)" | bc)
                object_size=$(LC_ALL=C printf '%.0f' "$floating_object_size")
                ;;
        PB)
                floating_object_size=$(echo "${object_size_base}*(1024^5)" | bc)
                object_size=$(LC_ALL=C printf '%.0f' "$floating_object_size")
                ;;
        EB)
                floating_object_size=$(echo "${object_size_base}*(1024^6)" | bc)
                object_size=$(LC_ALL=C printf '%.0f' "$floating_object_size")
                ;;
        ZB)
                floating_object_size=$(echo "${object_size_base}*(1024^7)" | bc)
                object_size=$(LC_ALL=C printf '%.0f' "$floating_object_size")
                ;;
        YB)
                floating_object_size=$(echo "${object_size_base}*(1024^8)" | bc)
                object_size=$(LC_ALL=C printf '%.0f' "$floating_object_size")
                ;;
        *)
                zenity --error --title "Fatal error in .drive-compute-object-size" --text="\t- Object: $object\n\t- Unknown multiplier: $multiplier\n\nPlease report that issue to: https://gitlab.com/jean-christophe-manciot/Drive/issues" --width 1200
                exit 1
                ;;
esac

# Returning the object size in bytes
echo ${object_size}