defmodule Row1 do
  use PosexionalRow, [:as_struct]

  guesser &__MODULE__.guesser/1

  fixed_value "row1"
  field :id, :id, 3
  field :binary_id, :binary_id, 3
  field :integer, :integer, 2
  field :float, :float, 6
  field :boolean, :boolean, 5
  field :string, :string, 4
  field :binary, :binary, 4

  def guesser("row1" <> _), do: true
  def guesser(_), do: false
end

defmodule StructRowFile do
  use PosexionalFile

  row Row1
end

StructRowFile.read("row1123ABA00432.99falseJohn Doe")
=>
[
  %Row1{
    binary: "Doe",
    binary_id: "ABA",
    boolean: false,
    float: 432.99,
    id: 123,
    integer: 0,
    string: "John"
  }
]

defmodule Row2 do
  use PosexionalRow, [:as_struct]

  guesser &__MODULE__.guesser/1

  field :custom, :custom, 4, parser: &String.to_atom/1
  field :array, :array, 4, separator: ""
  field :list, :list, 7, separator: "|"
  field :decimal, :decimal, 8
  field :date, :date, 8, format_in: "{0M}{0D}{YYYY}"
  field :time, :time, 8, format_in: "%H%M%S%f"
  field :time2, :time, 6, format_in: "%H%M%S"
  field :datetime, :datetime, 14, format_in: "%d%m%Y%H%M%S", timezone: "America/Sao_Paulo"
  field :naive_dt, :naive_datetime, 23, format_in: "%d/%m/%Y@%H:%M:%S.%L"
  field :utc_dt, :utc_datetime, 23, format_in: "%Y-%m-%d %H:%M:%S.%L"

  def guesser("afoo" <> _), do: true
  def guesser(_), do: false
end

defmodule StructRowFile do
  use PosexionalFile

  row Row2
end

StructRowFile.read("afoo1234cat|dog123.45  01312021235959990745001209198807450031/12/2021@23:59:59.9992022-01-01 00:00:00.000")
=>
[
%Row2{
     array: ["1", "2", "3", "4"],
     custom: :afoo,
     date: ~D[2021-01-31],
     datetime: %DateTime{
       year: 1988,
       month: 9,
       day: 12,
       hour: 7,
       minute: 45,
       second: 00,
       utc_offset: -10800,
       time_zone: "America/Sao_Paulo",
       std_offset: 0,
       zone_abbr: "-03"
     },
     decimal: 123.45,
     list: ["cat", "dog"],
     naive_dt: ~N[2021-12-31 23:59:59.999],
     time: ~T[23:59:59.99],
     time2: ~T[07:45:00],
     utc_dt: ~U[2022-01-01 00:00:00Z]
   }
]