#!/usr/bin/env bash

validate_root_usage() {
  if [[ "$(id -u)" -ne 0 ]]; then
    fail "$(t root_required)"
  fi
}

validate_core_support() {
  local supported_cores="pmmp,paper,purpur,velocity,powernukkitx,nethergamesmc,bds"
  local supported_os="ubuntu,debian"
  local planned_os="arch,fedora,rocky,almalinux"

  case "$CORE" in
    pmmp|paper|purpur|velocity|powernukkitx|nethergamesmc|bds)
      ;;
    *)
      fail "$(t unsupported_core "$CORE" "$supported_cores" "${SCRIPT_DIR}/manifests/cores.json")"
      ;;
  esac

  case "$OS_ID" in
    ubuntu|debian)
      return 0
      ;;
    arch|fedora|rocky|almalinux)
      warn "$(t os_coreplanned "$OS_ID" "${SCRIPT_DIR}/manifests/os-support.json")"
      ;;
    *)
      fail "$(t unsupported_os "$OS_ID" "$supported_os" "$planned_os" "${SCRIPT_DIR}/manifests/os-support.json")"
      ;;
  esac
}

validate_eula() {
  if ! is_java_core "$CORE"; then
    return 0
  fi

  if [[ "${ACCEPT_EULA,,}" != "yes" ]]; then
    fail "$(t eula_denied)"
  fi
}

validate_port() {
  local port="$1"
  local protocol="$2"

  if ! command -v ss >/dev/null 2>&1; then
    if command -v lsof >/dev/null 2>&1; then
      if [[ "$protocol" == "tcp" ]]; then
        if lsof -iTCP:"$port" -sTCP:LISTEN -n -P >/dev/null 2>&1; then
          fail "$(t tcp_port_in_use "$port")"
        fi
      else
        if lsof -iUDP:"$port" -n -P >/dev/null 2>&1; then
          fail "$(t udp_port_in_use "$port")"
        fi
      fi
      return 0
    fi
  fi

  if [[ "$protocol" == "tcp" ]]; then
    if ss -ltn | awk '{print $4}' | grep -q ":${port}$"; then
      fail "$(t tcp_port_in_use "$port")"
    fi
  else
    if ss -lun | awk '{print $5}' | grep -q ":${port}$"; then
      fail "$(t udp_port_in_use "$port")"
    fi
  fi
}