# NOTE: This file is auto generated by OpenAPI Generator
# https://openapi-generator.tech
# Do not edit this file manually.

defmodule DocuSign.Deserializer do
  @moduledoc """
  Helper functions for deserializing responses into models
  """

  @doc """
  Update the provided model with a deserialization of a nested value.

  ### Parameters

  - `model` (struct) - The model to be updated
  - `field` (atom) - The field to be updated
  - `field_type` (atom) - The type of the field to be updated
  - `decoder` (function) - A function that can decode the value

  ### Returns

  Struct
  """
  @spec deserialize(struct(), atom(), atom(), (any() -> any())) :: struct()
  def deserialize(model, field, :list, decoder) do
    value = Map.get(model, field)

    cond do
      is_nil(value) ->
        model

      is_list(value) ->
        update_in(model, [field], fn list ->
          Enum.map(list, fn item ->
            if is_map(item) do
              decoder.decode(item)
            else
              item
            end
          end)
        end)

      true ->
        model
    end
  end

  def deserialize(model, field, :struct, decoder) do
    value = Map.get(model, field)

    cond do
      is_nil(value) ->
        model

      is_map(value) ->
        update_in(model, [field], &decoder.decode/1)

      true ->
        model
    end
  end

  def deserialize(model, field, :map, decoder) do
    value = Map.get(model, field)

    cond do
      is_nil(value) ->
        model

      is_map(value) ->
        update_in(model, [field], fn the_map ->
          Map.new(the_map, fn {k, v} ->
            {k, decoder.decode(v)}
          end)
        end)

      true ->
        model
    end
  end

  def deserialize(model, field, :date, _decoder) do
    value = Map.get(model, field)

    case is_binary(value) do
      true ->
        case Date.from_iso8601(value) do
          {:ok, date} ->
            Map.put(model, field, date)

          _ ->
            model
        end

      _ ->
        model
    end
  end

  def deserialize(model, field, :datetime, _decoder) do
    value = Map.get(model, field)

    case is_binary(value) do
      true ->
        case DateTime.from_iso8601(value) do
          {:ok, datetime, _offset} ->
            Map.put(model, field, datetime)

          _ ->
            model
        end

      _ ->
        model
    end
  end
end