defmodule VinDecode.Dictionaries.Years do
  @moduledoc false

  @data_from1981to2009 %{
    "B" => 1981,
    "C" => 1982,
    "D" => 1983,
    "E" => 1984,
    "F" => 1985,
    "G" => 1986,
    "H" => 1987,
    "J" => 1988,
    "K" => 1989,
    "L" => 1990,
    "M" => 1991,
    "N" => 1992,
    "P" => 1993,
    "R" => 1994,
    "S" => 1995,
    "T" => 1996,
    "V" => 1997,
    "W" => 1998,
    "X" => 1999,
    "Y" => 2000,
    "1" => 2001,
    "2" => 2002,
    "3" => 2003,
    "4" => 2004,
    "5" => 2005,
    "6" => 2006,
    "7" => 2007,
    "8" => 2008,
    "9" => 2009
  }

  @data_from2010to2039 %{
    "A" => 2010,
    "B" => 2011,
    "C" => 2012,
    "D" => 2013,
    "E" => 2014,
    "F" => 2015,
    "G" => 2016,
    "H" => 2017,
    "J" => 2018,
    "K" => 2019,
    "L" => 2020,
    "M" => 2021,
    "N" => 2022,
    "P" => 2023,
    "R" => 2024,
    "S" => 2025,
    "T" => 2026,
    "V" => 2027,
    "W" => 2028,
    "X" => 2029,
    "Y" => 2030,
    "1" => 2031,
    "2" => 2032
  }

  def year(vin) do
    char7 = String.at(vin, 6)
    char10 = String.at(vin, 9)

    case Integer.parse(char7) do
      :error -> @data_from2010to2039[char10]
      {_number, _binary} -> @data_from1981to2009[char10]
    end
  end
end