#!/usr/bin/env bash

: ' A simple MySQL import script with optimized options

'

# check if debug flag is set
if [ "${DEBUG}" = true ]; then

  set -x # enable print commands and their arguments as they are executed.
  export # show all declared variables (includes system variables)
  whoami # print current user

else

  # unset if flag is not set
  unset DEBUG

fi

# bash default parameters
set -o errexit  # make your script exit when a command fails
set -o pipefail # exit status of the last command that threw a non-zero exit code is returned
set -o nounset  # exit when your script tries to use undeclared variables

# parameters
__mysql_user="${1:-"root"}"
__mysql_password="${2:-"password"}"
__mysql_port="${3:-"3306"}"
__mysql_host="${4:-"127.0.0.1"}"
__mysql_database="${5:-"database"}"
__input_file="${6:-"/tmp/${__mysql_database}.gz"}"

# binaries
__MYSQL=$(which mysql)
__ZCAT=$(which zcat)

# create mysql import command
readonly __mysql_import_string="${__ZCAT} "${__input_file}" \
                                | ${__MYSQL}  --user="${__mysql_user}" \
                                              --password="${__mysql_password}" \
                                              --host="${__mysql_host}" \
                                              --port="${__mysql_port}" \
                                              --database="${__mysql_database}""

# try to import dump file
echo "Importing database "${__mysql_database}" from file "${__input_file}", please wait..."
if ! eval $__mysql_import_string; then

  echo "ERROR! MySQL could not perform import for dump file "${__input_file}" to database "${__mysql_database}""
  exit 1

fi