#!/usr/bin/env bash
set -x
set -eo pipefail

# Check if a custom parameter has been set, otherwise use default values
DB_PORT="${DB_PORT:=5432}"
SUPERUSER="${SUPERUSER:=postgres}"
SUPERUSER_PWD="${SUPERUSER_PWD:=postgres}"

# Allow to skip Docker if a dockerized Postgres database is already running
if [[ -z "${SKIP_DOCKER}" ]]
then
  # if a postgres container is running, print instructions to kill it and exit
  RUNNING_POSTGRES_CONTAINER=$(docker ps --filter 'name=postgres' --format '{{.ID}}')
  if [[ -n $RUNNING_POSTGRES_CONTAINER ]]; then
    echo >&2 "there is a postgres container already running, kill it with"
    echo >&2 "    docker kill ${RUNNING_POSTGRES_CONTAINER}"
    exit 1
  fi
  CONTAINER_NAME="postgres"
  # Launch postgres using Docker
  docker run \
      --env POSTGRES_USER=${SUPERUSER} \
      --env POSTGRES_PASSWORD=${SUPERUSER_PWD} \
      --health-cmd="pg_isready -U ${SUPERUSER} || exit 1" \
      --health-interval=1s \
      --health-timeout=5s \
      --health-retries=5 \
      --publish "${DB_PORT}":5432 \
      --detach \
      --name "${CONTAINER_NAME}" \
      postgres -N 1000
      # ^ Increased maximum number of connections for testing purposes
      
  until [ \
    "$(docker inspect -f "{{.State.Health.Status}}" ${CONTAINER_NAME})" == \
    "healthy" \
  ]; do     
    >&2 echo "Postgres is still unavailable - sleeping"
    sleep 1 
  done
fi

>&2 echo "Postgres is up and running on port ${DB_PORT} - running migrations now!"