#!/bin/bash
set -e

# Get script name
SCRIPT=$(basename "$0")

# Display Help
Help() {
  echo
  echo "$SCRIPT"
  echo
  echo "Description: Create database in Postgres container."
  echo "Syntax: $SCRIPT [-c|-d|help]"
  echo "Example: $SCRIPT -c postgres01 -d n8n "
  echo "options:"
  echo "  -c    Docker container name. Defaults to 'postgres'."
  echo "  -d    Name of database."
  echo "  help  Show $SCRIPT manual."
  echo
}

# Show help and exit
if [[ "$1" == "help" ]]; then
    Help
    exit
fi

# Process params
while getopts ":c: :d: :f:" opt; do
  case $opt in
    c) CONTAINER="$OPTARG";;
    d) DATABASE="$OPTARG";;
    \?) echo "Invalid option -$OPTARG" >&2
    Help
    exit;;
  esac
done

# Fallback to environment vars and default values
: ${CONTAINER:='postgres'}

# Verify variables
[[ -z "$DATABASE" ]] && { echo "Parameter -d|database is empty" ; exit 1; }

# Get existing databases
DATABASES=$(docker-postgres-list -c "$CONTAINER")

# Create database if not exists
if [[ "$DATABASES"  =~ "$DATABASE" ]]; then
  echo "Database $DATABASE already exists."
  exit 0
fi

echo "Create Postgres database $DATABASE ..."
docker exec -i $CONTAINER /bin/bash -c "psql postgresql://\$POSTGRES_USER:\$POSTGRES_PASSWORD@\$HOSTNAME/postgres -c 'CREATE DATABASE \"$DATABASE\";'"
echo "Database $DATABASE has been created."