#!/usr/bin/env bash
# Pre-validate the environment
if [ "${POSTGRES_DB}" = "**None**" -a "${POSTGRES_DB_FILE}" = "**None**" ]; then
  echo "You need to set the POSTGRES_DB or POSTGRES_DB_FILE environment variable."
  exit 1
fi

if [ "${POSTGRES_HOST}" = "**None**" ]; then
  if [ -n "${POSTGRES_PORT_5432_TCP_ADDR}" ]; then
    POSTGRES_HOST=${POSTGRES_PORT_5432_TCP_ADDR}
    POSTGRES_PORT=${POSTGRES_PORT_5432_TCP_PORT}
  else
    echo "You need to set the POSTGRES_HOST environment variable."
    exit 1
  fi
fi

if [ "${POSTGRES_USER}" = "**None**" -a "${POSTGRES_USER_FILE}" = "**None**" ]; then
  echo "You need to set the POSTGRES_USER or POSTGRES_USER_FILE environment variable."
  exit 1
fi

if [ "${POSTGRES_PASSWORD}" = "**None**" -a "${POSTGRES_PASSWORD_FILE}" = "**None**" -a "${POSTGRES_PASSFILE_STORE}" = "**None**" ]; then
  echo "You need to set the POSTGRES_PASSWORD or POSTGRES_PASSWORD_FILE or POSTGRES_PASSFILE_STORE environment variable or link to a container named POSTGRES."
  exit 1
fi

#Process vars
if [ "${POSTGRES_DB_FILE}" = "**None**" ]; then
  POSTGRES_DBS=$(echo "${POSTGRES_DB}" | tr , " ")
elif [ -r "${POSTGRES_DB_FILE}" ]; then
  POSTGRES_DBS=$(cat "${POSTGRES_DB_FILE}")
else
  echo "Missing POSTGRES_DB_FILE file."
  exit 1
fi
if [ "${POSTGRES_USER_FILE}" = "**None**" ]; then
  export PGUSER="${POSTGRES_USER}"
elif [ -r "${POSTGRES_USER_FILE}" ]; then
  export PGUSER=$(cat "${POSTGRES_USER_FILE}")
else
  echo "Missing POSTGRES_USER_FILE file."
  exit 1
fi
if [ "${POSTGRES_PASSWORD_FILE}" = "**None**" -a "${POSTGRES_PASSFILE_STORE}" = "**None**" ]; then
  export PGPASSWORD="${POSTGRES_PASSWORD}"
elif [ -r "${POSTGRES_PASSWORD_FILE}" ]; then
  export PGPASSWORD=$(cat "${POSTGRES_PASSWORD_FILE}")
elif [ -r "${POSTGRES_PASSFILE_STORE}" ]; then
  export PGPASSFILE="${POSTGRES_PASSFILE_STORE}"
else
  echo "Missing POSTGRES_PASSWORD_FILE or POSTGRES_PASSFILE_STORE file."
  exit 1
fi
export PGHOST="${POSTGRES_HOST}"
export PGPORT="${POSTGRES_PORT}"
KEEP_MINS=${BACKUP_KEEP_MINS}
KEEP_DAYS=${BACKUP_KEEP_DAYS}
KEEP_WEEKS=`expr $(((${BACKUP_KEEP_WEEKS} * 7) + 1))`
KEEP_MONTHS=`expr $(((${BACKUP_KEEP_MONTHS} * 31) + 1))`

# Validate backup dir
if [ -d "${BACKUP_DIR}" -a -w "${BACKUP_DIR}" -a -x "${BACKUP_DIR}" ]; then
  echo "Backups will be stored at ${BACKUP_DIR}."
else
  echo "BACKUP_DIR points to a file or folder with insufficient permissions."
  exit 1
fi