#!/bin/sh
set -eu
set -o pipefail 2>/dev/null || true

# Create application databases and ensure ownership and grants (idempotent).

: "${GITEA_DB:=giteadb}"
: "${GITEA_DB_USER:=gitea}"
: "${ODOO_DB:=odoodb}"
: "${ODOO_DB_USER:=odoo}"

echo "[init] create-databases: gitea_db=${GITEA_DB}, odoo_db=${ODOO_DB}"

db_exists() {
  psql -tAc "SELECT 1 FROM pg_database WHERE datname='$1'" | grep -q 1 || return 1
}

db_owner() {
  psql -tAc "SELECT pg_catalog.pg_get_userbyid(datdba) FROM pg_database WHERE datname='$1'" | tr -d '[:space:]'
}

create_or_alter_db() {
  local db="$1"; shift
  local owner="$1"; shift

  if db_exists "$db"; then
    echo "[init] database '$db' already exists"
    current_owner=$(db_owner "$db") || current_owner=""
    if [ "$current_owner" != "$owner" ]; then
      echo "[init] changing owner of '$db' from '$current_owner' to '$owner'"
      psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" -c "ALTER DATABASE \"${db}\" OWNER TO \"${owner}\";"
    fi
  else
    echo "[init] creating database '$db' with owner '$owner'"
    psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" -c "CREATE DATABASE \"${db}\" OWNER \"${owner}\";"
  fi

  echo "[init] granting privileges on ${db} to ${owner}"
  psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" -c "GRANT ALL PRIVILEGES ON DATABASE \"${db}\" TO \"${owner}\";"
}

create_or_alter_db "${GITEA_DB}" "${GITEA_DB_USER}"
create_or_alter_db "${ODOO_DB}" "${ODOO_DB_USER}"

echo "[init] create-databases finished"