defmodule Accounting do
  import Accounting.Helpers, only: [
    calculate_ADB!: 3,
    calculate_balance: 1,
    calculate_balance!: 2,
    sort_transactions: 1,
  ]

  @adapter Application.get_env(:accounting, :adapter, Accounting.TestAdapter)

  defdelegate register_categories(categories), to: @adapter

  defdelegate create_account(number), to: @adapter

  defdelegate receive_money(from, date, line_items), to: @adapter

  def fetch_account_transactions(account_number) do
    with {:ok, txns} <- @adapter.fetch_account_transactions(account_number) do
      {:ok, sort_transactions(txns)}
    end
  end

  def fetch_balance(account_number) do
    with {:ok, txns} <- @adapter.fetch_account_transactions(account_number) do
      {:ok, calculate_balance(txns)}
    end
  end

  def fetch_balance(account_number, date) do
    with {:ok, transactions} <- fetch_account_transactions(account_number) do
      {:ok, calculate_balance!(transactions, date)}
    end
  end

  def fetch_ADB(account_number, start_date, end_date) do
    with {:ok, transactions} <- fetch_account_transactions(account_number) do
      {:ok, calculate_ADB!(transactions, start_date, end_date)}
    end
  end
end