defmodule SoftBank.Tellers.Supervisor do
  use Supervisor

  @pool_name :soft_bank_tellers

  alias SoftBank.Config

  def start_link do
    Supervisor.start_link(__MODULE__, nil, name: __MODULE__)
  end

  def start() do
    Supervisor.start_child(__MODULE__, [])
  end

  def stop(id) do
    Process.exit(id, :shutdown)
    :ok
  end

  def init([]) do
    # Here are my pool options
    pool_options = [
      name: {:local, @pool_name},
      worker_module: SoftBank.Teller,
      size: Config.get(:pool_size, 10),
      max_overflow: Config.get(:pool_max_overflow, 1)
    ]

    children = [
      :poolboy.child_spec(@pool_name, pool_options, [])
    ]

    supervise(children, strategy: :one_for_one)
  end

  def transfer(destination_account_number) do
    :poolboy.transaction(
      @pool_name,
      fn worker -> GenServer.cast(worker, {:transfer, destination_account_number}) end,
      Config.get(:timeout, 5000)
    )
  end

  def withdrawl(amount) do
    :poolboy.transaction(
      @pool_name,
      fn worker -> GenServer.call(worker, {:withdrawl, amount}) end,
      Config.get(:timeout, 5000)
    )
  end

  def deposit(amount) do
    :poolboy.transaction(
      @pool_name,
      fn worker -> GenServer.call(worker, {:deposit, amount}) end,
      Config.get(:timeout, 5000)
    )
  end

  def convert(amount, dest_currency) do
    :poolboy.transaction(
      @pool_name,
      fn worker -> GenServer.call(worker, {:convert, amount, dest_currency}) end,
      Config.get(:timeout, 5000)
    )
  end

  def balance(account_number) do
    :poolboy.transaction(
      @pool_name,
      fn worker -> GenServer.call(worker, {:balance, account_number}) end,
      Config.get(:timeout, 5000)
    )
  end

  def login(account_number) do
    :poolboy.transaction(
      @pool_name,
      fn worker -> GenServer.call(worker, {:balance, account_number}) end,
      Config.get(:timeout, 5000)
    )
  end

  def show(account_number) do
    :poolboy.transaction(
      @pool_name,
      fn worker -> GenServer.call(worker, :show_state) end,
      Config.get(:timeout, 5000)
    )
  end
end