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#!/bin/bash
###################################################################################################
# .drive-delete-unsynced-remote
###################################################################################################
# Copyright 2017-2022 Jean-Christophe Manciot <jcmanciot@sdxlive.com>
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except 
# in compliance with the License. You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# This script is using a project hosted at https://github.com/odeke-em/drive, originally developed 
# by Burcu Dogan while working on the Google Drive team and now maintained by Emmanuel T Odeke.
#
# 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.
###################################################################################################

###################################################################################################
#
# Deleting recursively all the files/folders (objects) listed in .driveselect under the section 
# [delete] from the current directory's remote equivalent on your Google Drive online.
# The scale of the operation does NOT depend on the depth setting in your 
# <google_drive_folder>/.driverc:
#       - files are deleted as expected
#       - folders are deleted with all their recursive contents, regardless of depth setting.
# The list of objects affected by this operation can be optionnaly filtered by
# <google_drive_folder>/.driveignore.
# This operation is **irreversible**.
#
###################################################################################################
#
# Requirements:
# ------------
#
# - We assume that:
#       + drive-google package is already installed.
#       + coreutils, perl-base, sed & zenity packages are already installed.
#
# - **This is an internal script called by drive-sync when necessary.**
#
# - <google_drive_folder>/.driverc:it must be properly setup, either manually or with drive-setup,
#                                  with the following settings:
#       * ...: cf. https://github.com/odeke-em/drive for a complete list of available  
#              options. They can only be set manually through .driverc or through drive-setup for
#              the sake of simplicity.
#              Cf. /etc/drive-google/.driverc for some examples.
#
# - <google_drive_folder>/.driveignore: it may be used to exclude/include some objects from the 
#                                       scope of the current drive-<command> by using regular
#                                       expressions.
#                                       Cf. /etc/drive-google/.driveignore for its format & some 
#                                       examples.
#
# - ./.driveselect: it may be used to include/exclude the objects from the scope of the current 
#                   drive-<command>. 
#                   Cf. /etc/drive-google/.driveselect for its format & some examples.
#
###################################################################################################
#
# Parameters:
# ----------
#
# - <message> is used in the interactive GUI windows
#
# - -<anything> will display this help message
#
###################################################################################################
if [[ $LOG_DRIVE_DELETE_UNSYNCED_REMOTE == ON ]]; then
        # Getting the last existing file descriptor of ~/.drive-google/logs/drive-google.log
        fd=$(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

#------------------------------------delete-objects------------------------------------------------
# Deleting all objects listed in "${filtered_objects[@]}"
# Usage: delete-objects | zenity --progress --percentage=0 --auto-close
# Return strings which feed 'zenity --progress'
# - "# Deleting $object"
# - "$current_percentage"
# The function uses the global array variables:
# - "${filtered_objects[@]}"
function delete-objects ()
{
        # Initializing:
        # - current deleted objects number so far,
        # - current percentage of checked objects so far,
        current_objects_number=0
        current_percentage=0

        for object in "${filtered_objects[@]}"
        do
                # Getting the object type from its leading character
                object_type=$(echo "$object" | extract_object_type)

                # Removing leading object stats
                object=$(echo "$object" | rm_object_stats)

                # Feeding 'zenity --progress'
                LC_ALL=C printf '%s\n' "# Deleting $object"

                if [[ $object_type == '-' ]]; then
                        # This is a file
                        # Getting its parent folder
                        folder="$(dirname "$object")"
                elif [[ $object_type == 'd' ]]; then
                        # This is a folder
                        folder="$object"
                else
                        # This is an unknown object type ?
                        output="??????:\t\t\t${object}"

                        # Saving $output in temporary .driveoutput.log file after having escaped all "escape sequences"
                        printf '%b\n' "$output" | escape_escape_sequences >> .driveoutput.log

                        # Moving on to the next object
                        continue
                fi

                # Checking whether the object has a parent other than the root <google_drive_folder>
                if [[ "$folder" != '.' ]]; then
                        # Checking whether current working directory is a descendant of the last parent folder
                        if [[ "$folder" =~ ^"${last_folder}"/ ]]; then
                                # It's unnecessary to apply the operation on this object, 
                                # since it has already been done on its parent folder,
                                # assuming ${filtered_objects[@]} list is correctly sorted 
                                # Moving on to the next object
                                continue
                        else
                                # It's a new parent folder
                                last_folder="$folder"
                        fi
                fi

                # Removing all occurrences of '&' in $object as a workaround to a markup ampersand issue with zenity
                noamp_object=$(echo "${object}" | rm_ampersand)

                # While there is a connection error and the user wants to continue trying
                while :
                do
                        # Deleting the $object - "-no-prompt" is strangely not possible: https://github.com/odeke-em/drive/issues/448
                        unset output
                        output=$(echo 'Y' | drive delete "$object" 2>&1)

                        # Checking $output
                        if [[ -z "${output[@]}" ]]; then
                                output="Deleted:\t\t${object}"
                        elif [[ "${output[@]}" =~ 'Get https://www.googleapis.com/drive/' ]]; then
                                # Connection error
                                # Displaying the error 
                                zenity --error --title "Connection error accessing your Google Drive online in ${noamp_local_folder}" --text="${noamp_object}\n\nCould not connect to https://www.googleapis.com/drive/v2/files or/nor to https://accounts.google.com/o/oauth2/token" --width 1400
                                zenity --question --title "Connection error accessing your Google Drive online in ${noamp_local_folder}" --text="${noamp_object}\n\nDo you want to abort current drive operation?" --width 1400

                                if [[ $? -eq 1 ]]; then
                                        # Continuing trying
                                        continue
                                elif [[ $? -eq 0 ]]; then
                                        # Aborting
                                        exit 9
                                fi
                        elif [[ "${output[@]}" =~ "doesn't exist" ]]; then
                                output="Absent:\t\t\t${object}"
                        elif [[ "${output[@]}" =~ 'Everything is up-to-date'\. ]]; then
                                output="Already deleted:\t${object}"
                        else
                                output="??????:\t\t\t${object}"
                        fi

                        if [[ ("$output" =~ 'Deleted') || ("$output" =~ 'Absent') || ("$output" =~ 'Already deleted') ]]; then
                                (( current_objects_number++ ))
        
                                # Computing the current percentage of pulled objects
                                current_percentage=$(echo "scale=4; (${current_objects_number}/${#filtered_objects[@]})*100" | bc)
        
                                # Feeding 'zenity --progress'
                                LC_ALL=C printf '%.2f\n' "$current_percentage"
                        fi

                        # We're done
                        break
                done

                # Saving $output in temporary .driveoutput.log file after having escaped all "escape sequences"
                printf '%b\n' "$output" | escape_escape_sequences >> .driveoutput.log
        done
}

#------------------------------------.drive-delete-unsynced-remote---------------------------------

message=$1

if [[ ! "$message" =~ ^- ]]; then
        local_folder="$(pwd)"

        # Removing all occurrences of '&' in $object as a workaround to a markup ampersand issue with zenity
        noamp_local_folder="$(echo "${local_folder}" | rm_ampersand)"

        # Finding local root Google Drive folder
        gd_root_folder="$(.drive-find-gd)"
        return_code=$?

        # Removing all occurrences of '&' in $gd_root_folder as a workaround to a markup ampersand issue with zenity
        noamp_gd_root_folder="$(echo "${gd_root_folder}" | rm_ampersand)"

        case $return_code in
                0)
                        # Everything is fine - we continue
                        ;;
                7)
                        zenity --warning --title "Drive context found in $noamp_gd_root_folder" --text="We have moved to $noamp_gd_root_folder\n\nIf you prefer to select another Google Drive folder:\n\t--> 'Change local folder' in drive-menu" --width 1400

                        cd "$gd_root_folder"

                        local_folder="$(pwd)"

                        # Removing all occurrences of '&' in $object as a workaround to a markup ampersand issue with zenity
                        noamp_local_folder="$(echo "${local_folder}" | rm_ampersand)"
                        ;;
                8)
                        zenity --error --title "No drive context found below and above $noamp_local_folder" --text="- either drive has not been initialized properly (at least one hop away from '/') with:\n\t--> '# drive init google_drive_folder' within a terminal\n- or we are not located below your google_drive_folder top level branch:\n\t--> 'Change local folder' in drive-menu" --width 1400
                        exit $return_code
                        ;;
                *)
                        # Something is fatally wrong
                        zenity --error --title "Fatal error in drive-menu" --text="\tUnknown return code from .drive-find-gd: $return_code\n\nPlease report that issue to: https://gitlab.com/jean-christophe-manciot/Drive/issues" --width 1200
                        exit 99
                        ;;
        esac

        # Filtering & sorting the objects list
        filtered_objects=()
        readarray -t filtered_objects < <(.drive-select-objects 'select_file' 'delete')

        if [[ ${#filtered_objects[@]} -eq 0 ]]; then
                zenity --warning --title "Deleting 0 $message" --text="None needs to be deleted" --width=1400
                exit 0
        fi

        # Purging the section [delete] in the file .driveselect
        .drive-write-driveselect delete "${null[@]}"

        printf '%s\n' "${filtered_objects[@]}" | zenity --text-info --title "Do you confirm deleting ${#filtered_objects[@]} $message?" --width 1800 --height 800
        if [[ ${PIPESTATUS[1]} -eq 0 ]]; then
                # OK has been selected
                > .driveoutput.log

                # Deleting all objects listed in "${filtered_objects[@]}"
                delete-objects | zenity --progress --percentage=0 --auto-close --title="Deleting ${#filtered_objects[@]} $message" --width 1800

                readarray -t deleted_objects < <(cat .driveoutput.log | select_Deleted)

                cat .driveoutput.log | zenity --text-info --title "Deleted ${#deleted_objects[@]}/${#filtered_objects[@]} $message" --width 1800 --height 800
                rm .driveoutput.log
        else
                zenity --warning --title "Do you confirm deleting ${#filtered_objects[@]} $message?" --text="Operation cancelled" --width=1400
        fi

        exit 0
else
        # Any -Parameter
        end_of_help_message_line_number=$(awk '/^if \[\[ \$LOG_/{ print NR; exit }' $(which drive-delete))
        ((end_of_help_message_line_number--))
        awk -v var=$end_of_help_message_line_number 'NR >= 20 && NR <= var' $(which drive-delete) | zenity --text-info --title "drive-delete help" --width 1125 --height 1000
        exit 1
fi