#!/usr/bin/env bash
PARAMS=""
BACKEND="${BACKEND:-postgres}"

die_backends() {
cat <<EOL
Invalid --backend argument. Available backends:
  postgres (default)
  bigquery
  citus
  mssql
  mysql

EOL
exit 1
}

while (( "$#" )); do
  case "$1" in
    --backend)
      if [ -n "$2" ] && [ "${2:0:1}" != "-" ]; then
        BACKEND=$2
        shift 2
      fi
      ;;
    *) # preserve positional arguments
      PARAMS="$PARAMS $1"
      shift
      ;;
  esac
done

# validate backend argument
case "$BACKEND" in
  postgres)
  ;;
  bigquery)
    source "scripts/bigquery.sh"

    verify_bigquery_pytest_env
  ;;
  citus)
  ;;
  mssql)
  ;;
  mysql)
  ;;
  *)
    die_backends
  ;;
esac

# set positional arguments in their proper place
eval set -- "$PARAMS"
export BACKEND