defmodule WorkloadServiceWeb.QueryHelpers do
  @moduledoc false

  alias OpenApiSpex.Schema

  @filter_count 3

  def flop(filter_fields, order_fields, other \\ []) do
    filter_params = build_filter_params(filter_fields, @filter_count)

    [
      page: [in: :query, schema: %Schema{type: :number, default: 1}],
      page_size: [in: :query, schema: %Schema{type: :number, default: 20}],
      "order_by[]": [in: :query, schema: %Schema{type: :array, items: %Schema{type: :string, enum: order_fields}}],
      "order_directions[]": [in: :query, schema: %Schema{type: :array, items: %Schema{type: :string, enum: ["asc", "desc"]}}]
    ] ++ filter_params ++ other
  end

  defp build_filter_params(fields, count) do
    for i <- 0..(count - 1) do
      [
        {"filters[#{i}][field]", [in: :query, schema: %Schema{type: :string, enum: fields}]},
        {"filters[#{i}][op]", [in: :query, schema: %Schema{type: :string, enum: Flop.Filter.allowed_operators(:all)}]},
        {"filters[#{i}][value]", [in: :query, schema: %Schema{type: :string}]}
      ]
    end |> List.flatten()
  end
end