defmodule Explorer.Log do
  @moduledoc "Captures a Web3 log entry generated by a transaction"

  use Ecto.Schema

  import Ecto.Changeset

  alias Explorer.Address
  alias Explorer.Log
  alias Explorer.Receipt

  @timestamps_opts [type: Timex.Ecto.DateTime,
                    autogenerate: {Timex.Ecto.DateTime, :autogenerate, []}]

  @required_attrs ~w(index data type)a
  @optional_attrs ~w(
    first_topic second_topic third_topic fourth_topic address_id
  )a

  schema "logs" do
    belongs_to :receipt, Receipt
    belongs_to :address, Address
    has_one :transaction, through: [:receipt, :transaction]
    field :index, :integer
    field :data, :string
    field :type, :string
    field :first_topic, :string
    field :second_topic, :string
    field :third_topic, :string
    field :fourth_topic, :string
    timestamps()
  end

  def changeset(%Log{} = log, attrs \\ %{}) do
    log
    |> cast(attrs, @required_attrs)
    |> cast(attrs, @optional_attrs)
    |> cast_assoc(:address)
    |> cast_assoc(:receipt)
    |> validate_required(@required_attrs)
  end
end