#!/usr/bin/env bash
set -euo pipefail

ENV_FILE=".env"

prompt_value() {
  local var_name="$1"
  local prompt_text="$2"
  local is_secret="${3:-false}"
  local value=""

  while [[ -z "$value" ]]; do
    if [[ "$is_secret" == "true" ]]; then
      read -r -s -p "$prompt_text: " value
      printf "\n"
    else
      read -r -p "$prompt_text: " value
    fi
  done

  printf -v "$var_name" '%s' "$value"
}

write_env_file() {
  local realm=""
  local workgroup=""
  local domain=""
  local join_user=""
  local join_password=""

  prompt_value realm "REALM (e.g. EXAMPLE.COM)"
  prompt_value workgroup "WORKGROUP (NetBIOS, e.g. EXAMPLE)"
  prompt_value domain "DOMAIN (AD DNS name or reachable DC FQDN)"
  prompt_value join_user "JOIN_USER (AD account with join rights)"
  prompt_value join_password "JOIN_PASSWORD" true

  cat > "$ENV_FILE" <<EOF
REALM=${realm}
WORKGROUP=${workgroup}
DOMAIN=${domain}
JOIN_USER=${join_user}
JOIN_PASSWORD=${join_password}
PUBLIC_GROUP=Domain Users
# SAMBA_HOSTNAME=ad-samba-file-server
# Optional overrides:
# LDAP_URI=ldaps://${domain}
# LDAP_BASE_DN=DC=example,DC=com
EOF

  chmod 600 "$ENV_FILE"
  printf "Created %s\n" "$ENV_FILE"
}

if [[ -f "$ENV_FILE" ]]; then
  read -r -p ".env already exists. Overwrite? [y/N]: " overwrite
  case "$overwrite" in
    y|Y|yes|YES)
      write_env_file
      ;;
    *)
      printf "Keeping existing .env\n"
      ;;
  esac
else
  write_env_file
fi

docker compose up -d
printf "Samba service started.\n"