#!/bin/sh

BACKUP_COUNT_MAX=5

# Backup individual files
FILES="
/etc/netctl/eth0-dhcp
"

# Backup all files from folder
FOLDER_FILES="
/etc/netctl
"

# Backup complete folder (recursively)
FOLDERS="
/etc/netctl
"

# Database credentials
USER="username"
PASSWORD="password"
HOST="127.0.0.1"

# Database names
DATABASES="
example
example2
"

# ------------------------------------ #

### Remove / create backup directories ###

if [ "$(dirname "$0")" != "." ]; then
	echo "Please run this script from the directory it resides."
	exit 1
fi

# Enable mathematics in POSIX shell
calc() { awk "BEGIN{print $*}"; }

# All directories
BACKUP_FOLDERS="$(find . -mindepth 1 -maxdepth 1 -type d)"

# Current amount of backups
BACKUP_COUNT=$(echo "$BACKUP_FOLDERS" | wc -l)

# Calculate the amount needed to remove
AMOUNT_REMOVE=$(calc "$BACKUP_COUNT" - $BACKUP_COUNT_MAX + 1)

# Remove the oldest backup folders
if [ "$AMOUNT_REMOVE" -ge 1 ]; then
	REMOVE="$(echo "$BACKUP_FOLDERS" | sort | head -n "$AMOUNT_REMOVE")"

	echo "Removing directories:"
	echo "$REMOVE"
	rm -rf $REMOVE
fi

# Execution location
DIR="$(pwd)"

# Create new backup folder
BACKUP_NAME="$(date +%Y-%m-%d_%H:%M:%S)"
mkdir "$DIR/$BACKUP_NAME"

### Start backup procedure ###

# Individual files
for FILE in $FILES; do
	mkdir -p "$DIR/$BACKUP_NAME/$(dirname "$FILE")"
	cp -a "$FILE" "$DIR/$BACKUP_NAME/$FILE"
done

# All files inside folder
for FOLDER_FILE in $FOLDER_FILES; do
	mkdir -p "$DIR/$BACKUP_NAME/$FOLDER_FILE"

	# Usind find -> read ensures filename space support
	find "$FOLDER_FILE" -maxdepth 1 -type f | while read -r FILE; do
		cp "$FILE" "$DIR/$BACKUP_NAME/$FILE"
	done
done

# Complete folder
for FOLDER in $FOLDERS; do
	mkdir -p "$DIR/$BACKUP_NAME/$FOLDER"
	cp -r "$FOLDER" "$DIR/$BACKUP_NAME/$(dirname "$FOLDER")"
done

# Set default file permissions
umask 177
# MYSQL Dump
for DATABASE in $DATABASES; do
	# mysqldump --user=$USER --protocol=socket -S /var/run/mysqld/mysqld.sock "$DATABASE" \
	mysqldump --user=$USER --password=$PASSWORD --host=$HOST "$DATABASE" \
			  > "$DIR/$BACKUP_NAME/$DATABASE-$BACKUP_NAME.sql"
done