#!/bin/bash
#/--------------------------------------------------------------------------------------------------------|  www.vdm.io  |------/
#
#	@version		1.0.0
#	@build			6th Marh, 2020
#	@package		sync websites
#	@author			Llewellyn van der Merwe <https://github.com/Llewellynvdm>
#	@copyright	Copyright (C) 2020. All Rights Reserved
#	@license		GNU/GPL Version 2 or later - http://www.gnu.org/licenses/gpl-2.0.html
#
#/-----------------------------------------------------------------------------------------------------------------------------/

##############################################################
##############              CHECK                   ##########
##############################################################
command -v rsync >/dev/null 2>&1 || {
	echo >&2 "We require rsync for this script to run, but it's not installed.  Aborting."
	exit 1
}
command -v crontab >/dev/null 2>&1 || {
	echo >&2 "We require crontab for this script to run, but it's not installed.  Aborting."
	exit 1
}
command -v md5sum >/dev/null 2>&1 || {
	echo >&2 "We require md5sum for this script to run, but it's not installed.  Aborting."
	exit 1
}
command -v awk >/dev/null 2>&1 || {
	echo >&2 "We require awk for this script to run, but it's not installed.  Aborting."
	exit 1
}
command -v realpath >/dev/null 2>&1 || {
	echo >&2 "We require realpath for this script to run, but it's not installed.  Aborting."
	exit 1
}
command -v stat >/dev/null 2>&1 || {
	echo >&2 "We require stat for this script to run, but it's not installed.  Aborting."
	exit 1
}

############################ GLOBAL ##########################
ACTION="sync"
OWNER="namibia"
REPONAME="demo-sync"
######### DUE TONOT BEING ABLE TO INCLUDE DYNAMIC ###########

#################### UPDATE TO YOUR NEEDS ####################
##############################################################
##############                                      ##########
##############               CONFIG                 ##########
##############                                      ##########
##############################################################
REPOURL="https://raw.githubusercontent.com/${OWNER}/${REPONAME}/master/"

##############################################################
##############                                      ##########
##############              DEFAULTS                ##########
##############                                      ##########
##############################################################
Datetimenow=$(TZ=":ZULU" date +"%m/%d/%Y @ %R (UTC)")
SCRIPTURL="${REPOURL}$ACTION.sh"
ACTIVEUSER=$(whoami)
HOMEPATH=~/
BASENAME=".${ACTION}_${OWNER}"
# set paths
BASEPATH="${HOMEPATH}${BASENAME}"
FOLDERPATH="${BASEPATH}_folders"
EXCLUDEPATH="${BASEPATH}_ex_"
DBPATH="${BASEPATH}_dbs"
CRONPATH="${BASEPATH}.cron"

##############################################################
##############                                      ##########
##############                MAIN                  ##########
##############                                      ##########
##############################################################
function main() {
	## set time for this run
	echoTweak "$ACTION on $Datetimenow"
	echo "started"
	## make sure cron is set
	setCron
	## check if sync databases are setup
	runSetup 1 "${DBPATH}"
	## check if sync folders are setup
	runSetup 2 "${FOLDERPATH}"
	## sync databases if available
	runSync 1 "${DBPATH}"
	## sync folders if available
	runSync 2 "${FOLDERPATH}"
}

### MAIN SETUP ###
function runSetup() {
	# check if already set
	if [ ! -f "$2" ]; then
		# if setup database
		if [ "$1" -eq "1" ]; then
			getSyncDBs "$2"
		# if setup folders
		elif [ "$1" -eq "2" ]; then
			getSyncFolders "$2"
		fi
	fi
}

### MAIN SYNC ###
function runSync() {
	# check if already set
	if [ -f "$2" ]; then
		# if setup database
		if [ "$1" -eq "1" ]; then
			syncDBs "$2"
		# if setup folders
		elif [ "$1" -eq "2" ]; then
			syncFolders "$2"
		fi
	fi
}

##############################################################
##############                                      ##########
##############             FUNCTIONS                ##########
##############                                      ##########
##############################################################

# little repeater
function repeat() {
	head -c $1 </dev/zero | tr '\0' $2
}

# simple basic random
function getRandom() {
	echo $(tr -dc 'A-HJ-NP-Za-km-z2-9' </dev/urandom | dd bs=5 count=1 status=none)
}

# md5 strings
function setMD5() {
	echo -n $1 | md5sum | awk '{print $1}'
}

# little echo tweak
function echoTweak() {
	echoMessage="$1"
	mainlen="$2"
	characters="$3"
	if [ $# -lt 2 ]; then
		mainlen=60
	fi
	if [ $# -lt 3 ]; then
		characters='\056'
	fi
	chrlen="${#echoMessage}"
	increaseBy=$((mainlen - chrlen))
	tweaked=$(repeat "$increaseBy" "$characters")
	echo -n "$echoMessage$tweaked"
}

# Set cronjob without removing existing
function setCron() {
	if [ ! -f "${CRONPATH}" ]; then
		echo ""
		echo -ne "\n Would you like set the cronjob now? [y/N]: "
		read -r answer
		if [[ $answer == "y" ]]; then
			# check if user crontab is set
			currentCron=$(crontab -u $CLIENTUSER -l 2>/dev/null)
			if [[ -z "${currentCron// /}" ]]; then
				currentCron="# SYNC WEBSITES crontab settings"
				echo "$currentCron" >"${CRONPATH}"
			else
				echo "$currentCron" >"${CRONPATH}"
			fi
			# check if the MAILTO is already set
			if [[ $currentCron != *"MAILTO"* ]]; then
				echo "MAILTO=\"\"" >>"${CRONPATH}"
				echo "" >>"${CRONPATH}"
			fi
			# get the Source Database IP/Domain
			echo -e "\n ################################################################################################"
			echo -ne " ##  Add the CRON TIMER here so you sync will run every day at 4am.\n"
			echo -ne " ##  That will look like our example below, see https://crontab.guru/#0_4_*_*_* for more details.\n"
			echo -e " ################################################################################################"
			read -e -p " ##  Example (0 4 * * *): " -i "0 4 * * *" INPUT_CRON_CICLE
			# check if the @reboot curl -s $SCRIPTURL | sudo bash is already set
			if [[ $currentCron != *"${INPUT_CRON_CICLE} curl -s $SCRIPTURL | bash"* ]]; then
				echo "${INPUT_CRON_CICLE} curl -s $SCRIPTURL | bash" >>"${CRONPATH}"
			fi
			# set the user cron
			crontab -u $ACTIVEUSER "${CRONPATH}"
			# close the block
			echo -e "\n ################################################################################################"
		else
			# to avoid asking again
			echo "See ${CRONPATH} for more details!"
			echo '# Do not remove this file!' >"${CRONPATH}"
			echo '# Please set your cronjob manually, with the following details' >>"${CRONPATH}"
			echo "# 0 4 * * * curl -s $SCRIPTURL | bash" >>"${CRONPATH}"
		fi
	fi
}

### setup sync databases file ###
function getSyncDBs() {
	# start building the database details
	echo "# SOURCE_DBSERVER	SOURCE_DATABASE	SOURCE_USER	SOURCE_PASS	TARGET_DBSERVER	TARGET_DATABASE	TARGET_USER	TARGET_PASS" >"$1"
	# default it no to run setup
	GETTING=0
	echo ""
	echo -ne "\n Would you like to add a set of sync databases? [y/N]: "
	read -r answer
	if [[ $answer == "y" ]]; then
		# start Database tutorial
		echo -ne "\n  RUNNING DATABASE SETUP\n"
		# set checker to get more
		GETTING=1
	fi
	# start setup
	while [ "$GETTING" -eq "1" ]; do
		# get the Source Database IP/Domain
		echo -ne "\n  Set the Source Database IP/Domain\n"
		read -e -p " # Example (127.0.0.1 | localhost): " -i "127.0.0.1" INPUT_SOURCE_DBSERVER
		# check that we have a string
		if [ ! ${#INPUT_SOURCE_DBSERVER} -ge 2 ]; then
			echo -ne "\n YOU MUST ADD A SOURCE DATABASE IP/DOMAIN!\n\n"
			# remove the file
			rm "$1"
			# start again
			exit 1
		fi
		# get the Source Database Name
		echo -ne "\n  Set the Source Database Name\n"
		echo -ne " # Example (database_name): "
		read -r INPUT_SOURCE_DATABASE
		# check that we have a string
		if [ ! ${#INPUT_SOURCE_DATABASE} -ge 2 ]; then
			echo -ne "\n YOU MUST ADD A SOURCE DATABASE NAME!\n\n"
			# remove the file
			rm "$1"
			# start again
			exit 1
		fi
		# get the Source Database User Name
		echo -ne "\n  Set the Source Database User Name\n"
		echo -ne " # Example (database_user): "
		read -r INPUT_SOURCE_USER
		# check that we have a string
		if [ ! ${#INPUT_SOURCE_USER} -ge 2 ]; then
			echo -ne "\n YOU MUST ADD A SOURCE DATABASE USER NAME!\n\n"
			# remove the file
			rm "$1"
			# start again
			exit 1
		fi
		# get the Source Database User Password
		echo -ne "\n  Set the Source Database User Password\n"
		echo -ne " # Example (realy..): "
		read -s INPUT_SOURCE_PASSWORD
		# check that we have a string
		if [ ! ${#INPUT_SOURCE_PASSWORD} -ge 2 ]; then
			echo -ne "\n YOU MUST ADD A SOURCE DATABASE USER PASSWORD!\n\n"
			# remove the file
			rm "$1"
			# start again
			exit 1
		fi
		# get the Target Database IP/Domain
		echo -ne "\n  Set the Target Database IP/Domain\n"
		read -e -p " # Example (127.0.0.1 | localhost): " -i "127.0.0.1" INPUT_TARGET_DBSERVER
		# check that we have a string
		if [ ! ${#INPUT_TARGET_DBSERVER} -ge 2 ]; then
			echo -ne "\n YOU MUST ADD A TARGET DATABASE IP/DOMAIN!\n\n"
			# remove the file
			rm "$1"
			# start again
			exit 1
		fi
		# get the Target Database Name
		echo -ne "\n  Set the Target Database Name\n"
		echo -ne " # Example (database_name): "
		read -r INPUT_TARGET_DATABASE
		# check that we have a string
		if [ ! ${#INPUT_TARGET_DATABASE} -ge 2 ]; then
			echo -ne "\n YOU MUST ADD A TARGET DATABASE NAME!\n\n"
			# remove the file
			rm "$1"
			# start again
			exit 1
		fi
		# get the Target Database User Name
		echo -ne "\n  Set the Target Database User Name\n"
		echo -ne " # Example (database_user): "
		read -r INPUT_TARGET_USER
		# check that we have a string
		if [ ! ${#INPUT_TARGET_USER} -ge 2 ]; then
			echo -ne "\n YOU MUST ADD A TARGET DATABASE USER NAME!\n\n"
			# remove the file
			rm "$1"
			# start again
			exit 1
		fi
		# get the Target Database User Password
		echo -ne "\n  Set the Target Database User Password\n"
		echo -ne " # Example (realy..): "
		read -s INPUT_TARGET_PASSWORD
		# check that we have a string
		if [ ! ${#INPUT_TARGET_PASSWORD} -ge 2 ]; then
			echo -ne "\n YOU MUST ADD A TARGET DATABASE USER PASSWORD!\n\n"
			# remove the file
			rm "$1"
			# start again
			exit 1
		fi
		# add to the file
		echo "${INPUT_SOURCE_DBSERVER}	${INPUT_SOURCE_DATABASE}	${INPUT_SOURCE_USER}	${INPUT_SOURCE_PASSWORD}	${INPUT_TARGET_DBSERVER}	${INPUT_TARGET_DATABASE}	${INPUT_TARGET_USER}	${INPUT_TARGET_PASSWORD}" >>"$1"
		# check if another should be added
		echo ""
		echo -ne "\n Would you like to add another set of sync databases? [y/N]: "
		read -r answer
		if [[ $answer != "y" ]]; then
			# end the loop
			GETTING=0
		fi
	done
}

### setup sync folders file ###
function getSyncFolders() {
	# start building the website folder details
	echo "# SOURCE_PATH	TARGET_PATH" >"$1"
	# default it no to run setup
	GETTING=0
	echo ""
	echo -ne "\n Would you like to add a set of sync folders? [y/N]: "
	read -r answer
	if [[ $answer == "y" ]]; then
		# start Folder tutorial
		echo -ne "\n  RUNNING FOLDER SETUP\n"
		# set checker to get more
		GETTING=1
	fi
	# start setup
	while [ "$GETTING" -eq "1" ]; do
		# get source folder path path
		echo -ne "\n  Set the Source Folder Path\n"
		echo -ne " # Example (/home/username_a/): "
		read -r INPUT_SOURCE_PATH
		# check that we have a source path
		if [ ! -d "$INPUT_SOURCE_PATH" ]; then
			echo -ne "\n YOU MUST ADD A SOURCE PATH!\n\n"
			# remove the file
			rm "$1"
			# start again
			exit 1
		fi
		# get target folder path path
		echo -ne "\n  Set the Target Folder Path\n"
		echo -ne " # Example (/home/username_b): "
		read -r INPUT_TARGET_PATH
		# check that we have a target path
		if [ ! -d "$INPUT_TARGET_PATH" ]; then
			echo -ne "\n YOU MUST ADD A TARGET PATH!\n\n"
			# remove the file
			rm "$1"
			# start again
			exit 1
		fi
		# must set realpath
		source_folder=$(realpath -s "${INPUT_SOURCE_PATH}")
		target_folder=$(realpath -s "${INPUT_TARGET_PATH}")
		# add to the file
		echo "${source_folder}	${target_folder}" >>"$1"
		# get hash
		HASH=$(setMD5 "${source_folder}${target_folder}")
		# check if exclusion is needed
		getExcluded "${EXCLUDEPATH}${HASH}"
		# check if another should be added
		echo ""
		echo -ne "\n Would you like to add another set of sync folders? [y/N]: "
		read -r answer
		if [[ $answer != "y" ]]; then
			# end the loop
			GETTING=0
		fi
	done
}

### setup sync folders file ###
function getExcluded() {
	# default it no to run setup
	GETTING=0
	echo ""
	echo -ne "\n Would you like to add excluded files/folders? [y/N]: "
	read -r answer
	if [[ $answer == "y" ]]; then
		# start exclution
		echo -ne "\n See for more details https://linuxize.com/post/how-to-exclude-files-and-directories-with-rsync/\n"
		# set checker to get more
		GETTING=1
	fi
	# start setup
	while [ "$GETTING" -eq "1" ]; do
		# get source folder path path
		echo -ne "\n  Add file or folder to exclude\n"
		echo -ne " # Example (configuration.php or administrator/*): "
		read -r INPUT_EXCLUDE
		# add to file
		echo "${INPUT_EXCLUDE}" >>"$1"
		# check if another should be added
		echo ""
		echo -ne "\n Would you like to add another exclusion? [y/N]: "
		read -r answer
		if [[ $answer != "y" ]]; then
			# end the loop
			GETTING=0
		fi
	done
}

### sync databases ###
function syncDBs() {
	while IFS=$'\t' read -r -a databases; do
		[[ "$databases" =~ ^#.*$ ]] && continue
		#  SOURCE_DBSERVER	SOURCE_DATABASE	SOURCE_USER	SOURCE_PASS	TARGET_DBSERVER	TARGET_DATABASE	TARGET_USER	TARGET_PASS
		syncDB "${databases[0]}" "${databases[1]}" "${databases[2]}" "${databases[3]}" "${databases[4]}" "${databases[5]}" "${databases[6]}" "${databases[7]}"
	done <$1
}

### sync database ###
function syncDB() {
	# give the user log data
	echoTweak "Syncing databases of [$2] with [$6]..."
	#	local source_server="$1"
	#	local source_db="$2"
	#	local source_user="$3"
	#	local source_pass="$4"
	#	local target_server="$5"
	#	local target_db="$6"
	#	local target_user="$7"
	#	local target_pass="$8"
	# move tables from one database to the other
	mysqldump --opt -q --host="$1" --user="$3" --password="$4" "$2" |
		mysql --host="$5" --user="$7" --password="$8" -C "$6"
	# we may want to look at passing the password more securly (TODO)
	# done :)
	echo "done"
}

### sync folders ###
function syncFolders() {
	while IFS=$'\t' read -r -a folders; do
		[[ "$folders" =~ ^#.*$ ]] && continue
		# SOURCE_PATH	TARGET_PATH
		syncFolder "${folders[0]}" "${folders[1]}"
	done <$1
}

### sync folder ###
function syncFolder() {
	local source_folder="$1"
	local target_folder="$2"
	# get the owners
	local source_owner=$(stat -c '%U' "${source_folder}")
	local target_owner=$(stat -c '%U' "${target_folder}")
	# give the user log data
	echoTweak "Syncing folders of [${source_owner}] with [${target_owner}]..."
	# get hash
	HASH=$(setMD5 "${source_folder}${target_folder}")
	# check if we have exclude file
	local tmpName=$(getRandom)
	local tmpPath="${HOMEPATH}.${tmpName}"
	# local exclude=''
	if [ -f "${EXCLUDEPATH}${HASH}" ]; then

		##########################################################################
		# I tried doing this exclude with rsync but it just does not work (TODO)
		#	  while IFS= read -r line; do
		#      exclude+=" --exclude '${line}'"
		#    done < "${EXCLUDEPATH}${HASH}"
		# IF YOU CAN HELP LET ME KNOW
		#########################################################################

		# make tmp dir
		mkdir "$tmpPath"
		# move file/folders out to tmp folder
		for line in $(cat ${EXCLUDEPATH}${HASH}); do
			line=$(echo $line | sed $'s/\r//')
			mv -f $target_folder/$line $tmpPath
		done
	fi
	# we use rsync to do all the sync work (very smart)
	rsync -qrd --delete "${source_folder}/" "${target_folder}"

	##########################################################################
	# I tried doing this exclude with rsync but it just does not work (TODO)
	#	if [ ! ${#exclude} -ge 2 ]; then
	#	  rsync -qrd --delete "${source_folder}/" "${target_folder}"
	#	else
	#	  rsync -qrd $exclude --delete "${source_folder}/" "${target_folder}"
	#	fi
	# IF YOU CAN HELP LET ME KNOW
	#########################################################################

	# move the files back
	if [ -f "${EXCLUDEPATH}${HASH}" ]; then
		# move file/folders out
		for line in $(cat ${EXCLUDEPATH}${HASH}); do
			line=$(echo $line | sed $'s/\r//')
			mv -f $tmpPath/$line $target_folder
		done
		# remove tmp dir
		rm -r "$tmpPath"
	fi

	# run chown again (will only work if script run as root)
	chown -R "${target_owner}":"${target_owner}" "${target_folder}/"*
	# done :)
	echo "done"
}

##############################################################
##############                                      ##########
##############                MAIN                  ##########
##############                                      ##########
##############################################################
main