#!/bin/bash

DIR_PATH=${1}
DIR=$(/usr/bin/basename ${DIR_PATH})
LOG="${DIR}-backup.log"
TIMESTAMP=$(/usr/bin/date +%Y/%m/%d' '%H:%M:%S)

#
# show to screen also and write to file
#
function log() {
  echo -e "\e[96m`date +'%d/%m/%Y %H:%M:%S'`\e[39m ${1}"
  echo -e "`date +'%d/%m/%Y %H:%M:%S'` ${1}" >> $LOG
}

#
# database - get credentials
#
function get_db_credentials() {
  SETTINGS=$(find ${DIR} -name settings.php | grep default)
  DATABASE=$(cat $SETTINGS | tr -d ' ' | grep "^'database'" | awk -F\' '{print $4}')
  USERNAME=$(cat $SETTINGS | tr -d ' ' | grep "^'username'" | awk -F\' '{print $4}')
  PASSWORD=$(cat $SETTINGS | tr -d ' ' | grep "^'password'" | awk -F\' '{print $4}')

  [[ -z "${SETTINGS}" ]] && log "Empty variable SETTINGS" && return 1
  [[ -z "${DATABASE}" ]] && log "Empty variable DATABASE" && return 1
  [[ -z "${USERNAME}" ]] && log "Empty variable USERNAME" && return 1
  [[ -z "${PASSWORD}" ]] && log "Empty variable PASSWORD" && return 1

  log "SETTINGS: ${SETTINGS}"
  log "DATABASE: ${DATABASE}"
  log "USERNAME: ${USERNAME}"
  log "PASSWORD: ${PASSWORD}"

  return 0
}

#
# database - verify credentials
#
function verify_db_credentials() {
  mysql -u"${USERNAME}" -p"${PASSWORD}" --batch --skip-column-names -e "SHOW DATABASES;" | grep "${DATABASE}" > /dev/null;

  if [ $? -ne 0 ];then
    log "Verify database credentials [FAIL]"
    return 1
  fi

  log "Verify database credentials [ OK ]"
  return 0
}

#
# database - export data
#
function export_db() {
  mysqldump -u"${USERNAME}" -p"${PASSWORD}" ${DATABASE} > ${DATABASE}.sql

  if [ $? -ne 0 ];then
    log "Export database [FAIL]"
    return 1
  fi

  log "Export database [ OK ]"
  return 0
}

#
# Check the path
#
function check_path() {
  [ ! -d ${DIR} ] && log "${TIMESTAMP} ${DIR} does not exist" && return 1
  [ ! -f ${DIR}/web/sites/default/settings.php ] && \
  [ ! -f ${DIR}/sites/default/settings.php ] && log "${TIMESTAMP} Cannot find setting.php" && return 1
  return 0
}

#
# Create tarball
#
function create_tarball() {
  log "Create ${DIR}-backup.tar.gz"
  tar -czpf "${DIR}-backup.tar.gz" "${DIR}" "${DIR}.sql"
  [ $? -ne 0 ] && return 1
  return 0
}

#
# Create checksum
#
function create_checksum() {
  log "Create ${DIR}-backup.md5sum checksum"
  CHECKSUM=$(md5sum ${DIR}-backup.tar.gz | awk '{print $1}' )
  echo ${CHECKSUM} > "${DIR}-backup.md5sum"
}

#
# Start
#
function main () {
  if check_path; then
    if get_db_credentials; then
      if verify_db_credentials; then
        if export_db; then
          if create_tarball; then
            create_checksum
          fi
        fi
      fi
    fi
  fi
}

[ ${#} -lt 1 ] && log "${TIMESTAMP} Directory argument is missing" && return 1
[ ${#} -gt 1 ] && log "${TIMESTAMP} Too many arguments" && return 1

main

#
# Show results
#
echo
# ls -lh ${DIR}-backup.tar.gz --color=auto
# ls -lh ${DIR}-backup.md5sum --color=auto
# ls -lh ${DIR}-backup.log --color=auto
ls -lh ${DIR}-backup.* --color=auto
echo
echo -e " MD5 checksum: $(cat ${DIR}-backup.md5sum)"
echo