defmodule Argos.Logger.Default do
  @moduledoc """
  Implementación por defecto del logger de Argos.

  Usa Aurora para colorear el mensaje según el nivel y aplicar efectos.
  """

  @behaviour Argos.Logger.Behaviour

  alias Aurora.{Color, Effects, Format}
  alias Aurora.Structs.{ChunkText, EffectInfo}

  @effects %{
    debug: [:dim],
    info: [],
    warning: [:bold],
    error: [:bold],
    critical: [:bold, :blink],
    emergency: [:bold, :blink, :reverse],
    alert: [:bold, :blink]
  }

  @impl Argos.Logger.Behaviour
  def log(level, message, metadata) do
    effects = Map.get(@effects, level, [])

    level
    |> format_message(message, metadata, effects)
    |> IO.puts()
  end

  defp format_message(level, message, metadata, effects) do
    timestamp = format_timestamp(metadata[:timestamp])
    level_str = String.upcase(to_string(level))
    module_info = format_module(metadata)

    chunks = build_log_chunks(timestamp, level, level_str, module_info, message, effects)

    Format.format(chunks)
  end

  defp build_log_chunks(timestamp, level, level_str, module_info, message, effects) do
    timestamp_chunks =
      if timestamp != "" do
        [
          %ChunkText{
            text: timestamp,
            color: Color.to_color_info(:secondary),
            effects: %EffectInfo{dim: true}
          },
          %ChunkText{
            text: " ",
            color: Color.to_color_info(:no_color)
          }
        ]
      else
        []
      end

    level_chunks = [
      %ChunkText{
        text: "[#{level_str}]",
        color: Color.to_color_info(level),
        effects: Effects.to_effect_info(effects)
      },
      %ChunkText{
        text: " ",
        color: Color.to_color_info(:no_color)
      }
    ]

    module_chunks =
      if module_info != "" do
        [
          %ChunkText{
            text: module_info,
            color: Color.to_color_info(:info),
            effects: %EffectInfo{dim: true}
          }
        ]
      else
        []
      end

    message_chunks = [
      %ChunkText{
        text: message,
        color: Color.to_color_info(level),
        effects: %EffectInfo{}
      }
    ]

    Enum.concat([timestamp_chunks, level_chunks, module_chunks, message_chunks])
  end

  def format_timestamp({{year, month, day}, {hour, min, sec, millisec}}) do
    "#{year}-#{pad(month)}-#{pad(day)} #{pad(hour)}:#{pad(min)}:#{pad(sec)}.#{pad(millisec, 3)}"
  end

  def format_timestamp(_), do: ""

  defp pad(number, length \\ 2) do
    number
    |> Integer.to_string()
    |> String.pad_leading(length, "0")
  end

  def format_module(metadata) do
    case {metadata[:module], metadata[:function], metadata[:file], metadata[:line]} do
      {mod, fun, file, line}
      when not is_nil(mod) and not is_nil(fun) and not is_nil(file) and not is_nil(line) ->
        "#{inspect(mod)}.#{fun} #{file}:#{line} "

      _ ->
        ""
    end
  end
end