defmodule Argos.CLI.Config do
  @moduledoc """
  Módulo para manejar la configuración del CLI (shell, variables de entorno, etc.).
  """

  @doc """
  Determina si se debe cargar el archivo de configuración del shell.
  """
  @spec should_load_config(keyword()) :: boolean()
  def should_load_config(opts) do
    no_config = Keyword.get(opts, :no_config, false) || Keyword.get(opts, :no_login, false)
    load_config = Keyword.get(opts, :load_config, false)

    if load_config, do: true, else: not no_config
  end

  @doc """
  Obtiene el shell configurado o el predeterminado.
  """
  @spec get_shell() :: String.t()
  def get_shell do
    Application.get_env(:argos, :shell, "/bin/zsh")
  end

  @doc """
  Obtiene el ejecutable del shell o el predeterminado si no se encuentra.
  """
  @spec get_shell_executable() :: String.t()
  def get_shell_executable do
    shell = get_shell()
    System.find_executable(shell) || shell
  end

  @doc """
  Construye las variables de entorno con asdf añadido al PATH.
  """
  @spec build_env_vars_with_asdf() :: [{charlist(), charlist()}]
  def build_env_vars_with_asdf do
    home = System.get_env("HOME") || "~"
    asdf_shims = Path.join(home, ".asdf/shims")
    asdf_bin = Path.join(home, ".asdf/bin")
    current_path = System.get_env("PATH") || ""
    updated_path = add_asdf_to_path(current_path, asdf_shims, asdf_bin)

    System.get_env()
    |> Map.put("PATH", updated_path)
    |> Enum.map(fn {k, v} -> {String.to_charlist(k), String.to_charlist(v)} end)
  end

  @doc """
  Obtiene el archivo de configuración del shell según el shell usado.
  """
  @spec get_shell_config_file(String.t()) :: String.t()
  def get_shell_config_file(shell) do
    home = System.get_env("HOME") || "~"
    shell_str = to_string(shell)
    get_default_config_for_shell(shell_str, home)
  end

  defp add_asdf_to_path(current_path, asdf_shims, asdf_bin) do
    if String.contains?(current_path, asdf_shims) do
      current_path
    else
      "#{asdf_shims}:#{asdf_bin}:#{current_path}"
    end
  end

  defp get_default_config_for_shell(shell_str, home) do
    cond do
      String.contains?(shell_str, "zsh") ->
        Path.join(home, ".zshrc")

      String.contains?(shell_str, "bash") ->
        bashrc = Path.join(home, ".bashrc")
        if File.exists?(bashrc), do: bashrc, else: Path.join(home, ".bash_profile")

      String.contains?(shell_str, "fish") ->
        Path.join(home, ".config/fish/config.fish")

      true ->
        Path.join(home, ".zshrc")
    end
  end
end