#!/usr/bin/env bash

# Copyright 2016 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# Vars assumed:
#   NUM_NODES
function get-master-size {
  local suggested_master_size=1
  if [[ "${NUM_NODES}" -gt "5" ]]; then
    suggested_master_size=2
  fi
  if [[ "${NUM_NODES}" -gt "10" ]]; then
    suggested_master_size=4
  fi
  if [[ "${NUM_NODES}" -gt "100" ]]; then
    suggested_master_size=8
  fi
  if [[ "${NUM_NODES}" -gt "250" ]]; then
    suggested_master_size=16
  fi
  if [[ "${NUM_NODES}" -gt "500" ]]; then
    suggested_master_size=32
  fi
  if [[ "${NUM_NODES}" -gt "3000" ]]; then
    suggested_master_size=64
  fi
  echo "${suggested_master_size}"
}

# Vars assumed:
#   NUM_NODES
function get-master-root-disk-size() {
  local suggested_master_root_disk_size="20GB"
  if [[ "${NUM_NODES}" -gt "1000" ]]; then
    suggested_master_root_disk_size="50GB"
  fi
  if [[ "${NUM_NODES}" -gt "2000" ]]; then
    suggested_master_root_disk_size="100GB"
  fi
  echo "${suggested_master_root_disk_size}"
}

# Vars assumed:
#   NUM_NODES
function get-master-disk-size() {
  local suggested_master_disk_size="20GB"
  if [[ "${NUM_NODES}" -gt "1000" ]]; then
    suggested_master_disk_size="100GB"
  fi
  if [[ "${NUM_NODES}" -gt "2000" ]]; then
    suggested_master_disk_size="200GB"
  fi
  echo "${suggested_master_disk_size}"
}

function get-node-ip-range {
  if [[ -n "${NODE_IP_RANGE:-}" ]]; then
    >&2 echo "Using user provided NODE_IP_RANGE: ${NODE_IP_RANGE}"
    echo "${NODE_IP_RANGE}"
    return
  fi
  local suggested_range="10.40.0.0/22"
  if [[ "${NUM_NODES}" -gt 1000 ]]; then
    suggested_range="10.40.0.0/21"
  fi
  if [[ "${NUM_NODES}" -gt 2000 ]]; then
    suggested_range="10.40.0.0/20"
  fi
  if [[ "${NUM_NODES}" -gt 4000 ]]; then
    suggested_range="10.40.0.0/19"
  fi
  echo "${suggested_range}"
}

function get-cluster-ip-range {
  local suggested_range="10.64.0.0/14"
  if [[ "${NUM_NODES}" -gt 1000 ]]; then
    suggested_range="10.64.0.0/13"
  fi
  if [[ "${NUM_NODES}" -gt 2000 ]]; then
    suggested_range="10.64.0.0/12"
  fi
  if [[ "${NUM_NODES}" -gt 4000 ]]; then
    suggested_range="10.64.0.0/11"
  fi
  echo "${suggested_range}"
}

# Calculate ip alias range based on max number of pods.
# Let pow be the smallest integer which is bigger or equal to log2($1 * 2).
# (32 - pow) will be returned.
#
# $1: The number of max pods limitation.
function get-alias-range-size() {
  for pow in {0..31}; do
    if (( 1 << $pow >= $1 * 2 )); then
      echo $((32 - pow))
      return 0
    fi
  done
}
# NOTE: Avoid giving nodes empty scopes, because kubelet needs a service account
# in order to initialize properly.
NODE_SCOPES="${NODE_SCOPES:-monitoring,logging-write,storage-ro}"