defmodule ExDets do
  @moduledoc """
    This module is a wrapper of erlang dets makes with ExWrapper.
    Go to the doc of :dets erlang.

    Only add from :dets, for the moment:
    * ExDets add dets_files?/1.
  """

  # TODO Test the utils/dets

  @doc ":dets.al/0 wrapper function."
  @spec all() :: [:dets.tab_name]
  def all() do
    :dets.all()
  end

  @doc ":dets.bchunk/2 wrapper function."
  @spec bchunk(name :: :dets.tab_name, continuation :: :start | :dets.cont) :: {:dets.cont, binary | tuple} | nil | {:error, term}
  def bchunk(name, continuation) do
    case :dets.bchunk(name,continuation) do
      {:error, _reason} = error -> ExWrapper.convert(error)
      {_continuation2, _data} = con_data -> con_data
      '$end_of_table' -> nil
    end
  end

  @doc ":dets.close/1 wrapper function."
  @spec close(name :: :dets.tab_name) :: :ok | {:error, term}
  def close(name) do
    case :dets.close(name) do
      :ok -> :ok
      error -> ExWrapper.convert(error)
    end
  end

  @doc ":dets.delete/2 wrapper function."
  @spec delete(name :: :dets.tab_name, key :: term) :: :ok | {:error, term}
  def delete(name, key) do
    case :dets.delete(name, key) do
      :ok -> :ok
      error -> ExWrapper.convert(error)
    end
  end

  @doc ":dets.delete_all_objects/1 wrapper function."
  @spec delete_all_objects(name :: :dets.tab_name) :: :ok | {:error, term}
  def delete_all_objects(name) do
    case :dets.delete_all_objects(name) do
      :ok -> :ok
      error -> ExWrapper.convert(error)
    end
  end

  @doc ":dets.delete_object/2 wrapper function."
  @spec delete_object(name :: :dets.tab_name, object :: :dets.object) :: :ok | {:error, term}
  def delete_object(name, object) do
    case :dets.delete_object(name, object) do
      :ok -> :ok
      error -> ExWrapper.convert(error)
    end
  end

  @doc ":dets.first/1 wrapper function."
  @spec first(name :: :dets.tab_name) :: term | nil
  def first(name) do
    case :dets.first(name) do
      '$end_of_table' -> nil
      key -> key
    end
  end

  @doc ":dets.foldl/3 wrapper function."
  @spec foldl(function :: (object :: :dets.object, acc_in :: term -> acc_out :: term), acc0 :: term, name :: :dets.tab_name) :: term | nil
  def foldl(function, acc0, name) do
    case :dets.foldl(function, acc0, name) do
      {:error, _reason} = error -> ExWrapper.convert(error)
      acc -> acc
    end
  end

  @doc ":dets.foldr/3 wrapper function."
  @spec foldl(function :: (object :: :dets.object, acc_in :: term -> acc_out :: term), acc0 :: term, name :: :dets.tab_name) :: term | nil
  def foldr(function, acc0, name) do
    case :dets.foldr(function, acc0, name) do
      {:error, _reason} = error -> ExWrapper.convert(error)
      acc -> acc
    end
  end

  @doc ":dets.from_ets/2 wrapper function."
  @spec from_ets(name :: :dets.tab_name, ets_tab :: :ets.tab) :: :ok | {:error, term}
  def from_ets(name, ets_tab) do
    case :dets.from_ets(name, ets_tab) do
      :ok -> :ok
      error -> ExWrapper.convert(error)
    end
  end

  @doc ":dets.info/1 wrapper function."
  @spec info(name :: :dets.tab_name) :: :dets.infolist | :undefined
  def info(name) do
    case :dets.info(name) do
      infolist when is_list(infolist) -> ExWrapper.convert(infolist)
      :undefined -> :undefined
    end
  end

  @doc ":dets.info/2 wrapper function."
  @spec info(name :: :dets.tab_name, item :: :dets.item) :: :dets.value | :undefined
  def info(name, item) do
    case :dets.info(name, item) do
      :undefined -> :undefined
      value -> ExWrapper.convert(value)
    end
  end

  @doc ":dets.init_table/2 wrapper function."
  @spec init_table(name :: :dets.tab_name, init_fun :: :dets.init_fun) :: :ok | {:error, term}
  def init_table(name, init_fun) do
    case :dets.init_table(name, init_fun) do
      :ok -> :ok
      error -> ExWrapper.convert(error)
    end
  end

  @doc ":dets.init_table/3 wrapper function."
  @spec init_table(name :: :dets.tab_name, init_fun :: :dets.init_fun, options :: :dets.options) :: :ok | {:error, term}
  def init_table(name, init_fun, options) do
    case :dets.init_table(name, init_fun, options) do
      :ok -> :ok
      error -> ExWrapper.convert(error)
    end
  end

  @doc ":dets.insert/2 wrapper function."
  @spec insert(name :: :dets.tab_name, objects :: :dets.objects) :: :ok | {:error, term}
  def insert(name, objects) do
    case :dets.insert(name, objects) do
      :ok -> :ok
      error -> ExWrapper.convert(error)
    end
  end

  @doc ":dets.insert_new/2 wrapper function."
  @spec insert_new(name :: :dets.tab_name, objects :: :dets.objects) :: boolean | {:error, term}
  def insert_new(name, objects) do
    case :dets.insert_new(name, objects)  do
      bool when is_boolean(bool) -> bool
      error -> ExWrapper.convert(error)
    end
  end

  @doc ":dets.is_compatible_bchunk_format/2 wrapper function."
  @spec compatible_bchunk_format?(name :: :dets.tab_name, bchunk_format :: :dets.bchunk_format) :: boolean
  def compatible_bchunk_format?(name, bchunk_format) do
    :dets.is_compatible_bchunk_format(name, bchunk_format)
  end

  @doc ":dets.is_dets_file/1 wrapper function."
  @spec dets_file?(filename :: :file.name) :: boolean
  def dets_file?(filename) do
    :dets.is_dets_file(filename)
  end

  @doc """
    It's an ajout from my conception, it's execute
    dets_file?/1 one each file in the same time
    with Task and check if any results is true.

    ## Example

       ExDets.open_file("my.dets", [])
       ExDets.open_file("other.dets", [])
       File.touch("otherfile")
       refute ExDets.dets_files?(["my.dets", "other.dets", "otherfile"])
  """
  @spec dets_files?(filenames :: [:file.name]) :: boolean
  def dets_files?(filenames) do
    filenames
    |> Enum.map(&(Task.async(fn -> dets_file?(&1) end)))
    |> Enum.map(&Task.await/1)
    |> Enum.all?(&(&1==true))
  end

  @doc ":dets.lookup/2 wrapper function."
  @spec lookup(name :: :dets.tab_name, key :: term) :: :dets.objects | {:error, term}
  def lookup(name, key) do
    case :dets.lookup(name, key) do
      objects when is_list(objects) -> objects
      {:error, _reason} = error -> ExWrapper.convert(error)
    end
  end

  @doc ":dets.match/1 wrapper function."
  @spec match(continuation :: :dets.cont) :: {[term], :dets.cont} | nil | {:error, term}
  def match(continuation) do
    case :dets.match(continuation) do
      {match, _continuation2} = matching when is_list(match) -> matching
      '$end_of_table' -> nil
      {:error, _reason} = error -> ExWrapper.convert(error)
    end
  end

  @doc ":dets.match/2 wrapper function."
  @spec match(name :: :dets.tab_name, pattern :: :dets.pattern) :: [term] | {:error, term}
  def match(name, pattern) do
    case :dets.match(name, pattern) do
      matchs when is_list(matchs) -> matchs
      {:error, _reason} = error -> ExWrapper.convert(error)
    end
  end

  @doc ":dets.match/3 wrapper function."
  @spec match(name :: :dets.tab_name, pattern :: :dets.pattern, n :: :default | integer) :: [term] | {:error, term}
  def match(name, pattern, n) do
    case :dets.match(name, pattern, n) do
      {matchs, _continuation} = matching when is_list(matchs) -> matching
      '$end_of_table' -> nil
      {:error, _reason} = error -> ExWrapper.convert(error)
    end
  end

  @doc ":dets.match_delete/2 wrapper function."
  @spec match_delete(name :: :dets.tab_name, pattern :: :dets.pattern) :: :ok | {:error, term}
  def match_delete(name, pattern) do
    case :dets.match_delete(name, pattern) do
      :ok -> :ok
      {:error, _reason} = error -> ExWrapper.convert(error)
    end
  end

  @doc ":dets.match_object/1 wrapper function."
  @spec match_object(continuation :: :dets.object_cont) :: {:dets.objects, :dets.object_cont} | nil | {:error, term}
  def match_object(continuation) do
    case :dets.match_object(continuation) do
      {matchs, _continuation2} = matching when is_list(matchs) -> matching
      '$end_of_table' -> nil
      {:error, _reason} = error -> ExWrapper.convert(error)
    end
  end

  @doc ":dets.match_object/2 wrapper function."
  @spec match_object(name :: :dets.tab_name, pattern :: :dets.pattern) :: :dets.objects | {:error, term}
  def match_object(name, pattern) do
    case :dets.match_object(name, pattern) do
      matchs when is_list(matchs) -> matchs
      {:error, _reason} = error -> ExWrapper.convert(error)
    end
  end

  @doc ":dets.match_object/3 wrapper function."
  @spec match_object(name :: :dets.tab_name, pattern :: :dets.pattern, n :: :default | integer) :: {:dets.objects, :dets.cont} | nil | {:error, term}
  def match_object(name, pattern, n) do
    case :dets.match_object(name, pattern, n) do
      {matchs, _continuation2} = matching when is_list(matchs) -> matching
      '$end_of_table' -> nil
      {:error, _reason} = error -> ExWrapper.convert(error)
    end
  end

  @doc ":dets.member/2 wrapper function."
  @spec member(name :: :dets.tab_name, key :: term) :: boolean | {:error, term}
  def member(name, key) do
    case :dets.member(name, key) do
      bool when is_boolean(bool) -> bool
      {:error, _reason} = error -> ExWrapper.convert(error)
    end
  end

  @doc ":dets.next/2 wrapper function."
  @spec next(name :: :dets.tab_name, key :: term) :: term | nil
  def next(name, key) do
    case :dets.next(name, key) do
      '$end_of_table' -> nil
      key2 -> key2
    end
  end

  @doc ":dets.open_file/1 wrapper function."
  @spec open_file(filename :: :file.name) :: {:ok, :dets.reference} | {:error, term}
  def open_file(filename) do
    case :dets.open_file(filename) do
      {:ok, _reference} = ref -> ref
      {:error, _reason} = error -> ExWrapper.convert(error)
    end
  end

  @doc ":dets.open_file/2 wrapper function."
  @spec open_file(name :: :dets.tab_name, args :: :dets.args) :: {:ok, :dets.tab_name} | {:error, term}
  def open_file(name, args) do
    case :dets.open_file(name, args) do
      {:ok, _name} = ref -> ref
      {:error, _reason} = error -> ExWrapper.convert(error)
    end
  end

  @doc ":dets.pid2name/1 wrapper fonction."
  @spec pid2name(pid :: pid) :: {:ok, :dets.tab_name} | :undefined
  def pid2name(pid) do
    case :dets.pid2name(pid) do
      {:ok, _name} = name -> name
      {:error, _reason} = error -> ExWrapper.convert(error)
    end
  end

  @doc ":dets.repair_continuation/2 wrapper function."
  @spec repair_continuation(continuation :: :dets.select_cont, match_spec :: :dets.match_spec) :: :dets.select_cont
  def repair_continuation(continuation, match_spec) do
    :dets.repair_continuation(continuation, match_spec)
  end

  @doc ":dets.safe_fixtable/2 wrapper function."
  @spec safe_fixtable(name :: :dets.tab_name, fix :: boolean) :: :ok
  def safe_fixtable(name, fix) do
    :dets.safe_fixtable(name, fix)
  end

  @doc ":dets.select/1 wrapper function."
  @spec select(continuation :: :dets.select_cont) :: {[term], :dets.select_cont} | nil | {:error, term}
  def select(continuation) do
    case :dets.select(continuation) do
      {selection, _continuation2} = selects when is_list(selection) -> selects
      '$end_of_table' -> nil
      {:error, _reason} = error -> ExWrapper.convert(error)
    end
  end

  @doc ":dets.select/2 wrapper function."
  @spec select(name :: :dets.tab_name, match_spec :: :dets.match_spec) :: [term] | {:error, term}
  def select(name, match_spec) do
    case :dets.select(name, match_spec) do
      selection when is_list(selection) -> selection
      {:error, _reason} = error -> ExWrapper.convert(error)
    end
  end

  @doc ":dets.select/3 wrapper function."
  @spec select(name :: :dets.tab_name, match_spec :: :dets.match_spec, n :: :default | integer) :: [term] | nil | {:error, term}
  def select(name, match_spec, n) do
    case :dets.select(name, match_spec, n) do
      selection when is_list(selection) -> selection
      '$end_of_table' -> nil
      {:error, _reason} = error -> ExWrapper.convert(error)
    end
  end

  @doc ":dets.select_delete/2 wrapper function."
  @spec select_delete(name :: term, match_spec :: :dets.match_spec) :: integer  | {:error, term}
  def select_delete(name, match_spec) do
    case :dets.select_delete(name, match_spec) do
      n when is_integer(n) -> n
      {:error, _reason} = error -> ExWrapper.convert(error)
    end
  end

  @doc ":dets.slot/2 wrapper function."
  @spec slot(name :: :dets.tab_name, i :: non_neg_integer) :: [:dets.object] | nil | {:error, term}
  def slot(name, i) do
    case :dets.slot(name, i) do
      objects when is_list(objects) -> objects
      '$end_of_table' -> nil
      {:error, _reason} = error-> ExWrapper.convert(error)
    end
  end

  @doc ":dets.sync/1 wrapper function."
  @spec sync(name :: :dets.tab_name) :: :ok | {:error, term}
  def sync(name) do
    case :dets.sync(name) do
      :ok -> :ok
      {:error, _reason} = error -> ExWrapper.convert(error)
    end
  end

  @doc ":dets.table/1 wrapper function."
  @spec table(name :: :dets.tab_name) :: :dets.query_handler
  def table(name) do
    :dets.table(name)
  end

  @doc ":dets.table/2 wrapper function."
  @spec table(name :: :dets.tab_name, options :: [:dets.option] | :dets.option) :: :qlc.query_handler
  def table(name, options) do
    :dets.table(name, options)
  end

  @doc ":dets.to_ets/2 wrapper function."
  @spec to_ets(name :: :dets.tab_name, :ets.tab) :: :ets.tab | {:error, term}
  def to_ets(name, ets_tab) do
    case :dets.to_ets(name, ets_tab) do
      {:error, _reason} = error -> ExWrapper.convert(error)
      ets -> ets
    end
  end

  @doc ":dets.traverse/2 wrapper function."
  @spec traverse(name :: :dets.tab_name, fun :: (:dets.object -> (:continue | {:continue, term} | {:done, term}))) :: ([term] | term) | {:error, term}
  def traverse(name, fun) do
    case :dets.traverse(name, fun) do
      {:error, _reason} = error -> ExWrapper.convert(error)
      return -> return
    end
  end

  @doc ":dets.update_counter/3 wrapper function."
  @spec update_counter(name :: :dets.tab_name, key :: term, increment :: {integer, integer} | integer) :: integer
  def update_counter(name, key, increment) do
    :dets.update_counter(name, key, increment)
  end
end