defmodule Casebot do
  @moduledoc """
  Documentation for `Casebot`.

  master_data is a list of tuples that contains the box designation, row number, and a list of tuples that contain tuples of the road name and address number
  [(box_designation, row_number, [(road_name, address_number), (road_name, address_number)]), (box_designation, row_number, [(road_name, address_number), (road_name, address_number)],]

  Persistence is stored as plaintext in a file called persist.csv. The

  """


@doc """

  master_loop
  Called by entry_function. Takes master_data object and modifies/reads that as
  program main loop. Recursive calls itself.

  """
  def master_loop(master_data) do

    entry = IO.gets(">>>")
    command_word = String.split(entry) |> List.first()
    words = String.split(entry)
    case command_word do
      "add"  -> add_to_master(words, master_data)
      "find"  -> find_in_master(words, master_data)
      "clear" -> clear_entry(words, master_data)
    end

    master_loop(master_data)

  end

  def run() do
    #master_data = ensure_file()
  end

  def ensure_file(path \\ "persist.csv") do
    unless File.exists?(path) do
      File.write!(path, "box_name,row_number,road_name,address_number\n")
    end

    path
  end

  def add_to_master(entry, master_data) do

  end

  def clear_entry(entry, master_data) do
  end

  def find_in_master(entry, master_data) do
    end


end