defmodule Argos.CLI.Executor do
  @moduledoc """
  Módulo para ejecutar comandos del CLI.

  Maneja la ejecución paralela de comandos del sistema, incluyendo:
  - Creación de scripts temporales
  - Gestión de variables de entorno (incluyendo asdf)
  - Ejecución mediante Ports
  - Captura de salida en tiempo real
  - Limpieza de archivos temporales

  ## Características

  - Ejecución paralela usando Tasks de Elixir
  - Preservación de códigos ANSI
  - Soporte para carga de configuración del shell
  - Integración con asdf para versiones específicas
  """

  alias Argos.{CLI.Config, Command, CommandResult}

  @default_command_timeout 300_000

  @doc """
  Ejecuta múltiples comandos en paralelo.
  """
  @spec run_commands_parallel([String.t()], keyword()) :: no_return()
  def run_commands_parallel(commands, opts \\ []) do
    tmp_dir = create_session_temp_dir()
    opts_with_tmp = Keyword.put(opts, :tmp_dir, tmp_dir)

    tasks =
      Enum.with_index(commands, 1)
      |> Enum.map(fn {cmd, index} ->
        Task.async(fn ->
          execute_command(cmd, Keyword.put(opts_with_tmp, :script_index, index))
        end)
      end)

    results = Enum.map(tasks, &Task.await(&1, :infinity))
    cleanup_session_temp_dir(tmp_dir)

    exit_code = if Enum.all?(results, & &1.success?), do: 0, else: 1
    System.halt(exit_code)
  end

  @doc """
  Ejecuta un comando individual.
  """
  @spec execute_command(String.t(), keyword()) :: CommandResult.t()
  def execute_command(command, opts \\ []) do
    if Keyword.get(opts, :asdf_local, false) do
      project_path = extract_project_path_from_command(command) || File.cwd!()
      Command.asdf_exec(command, project_path, opts)
    else
      execute_command_normal(command, opts)
    end
  end

  defp execute_command_normal(command, opts) do
    script_path = create_temp_script(command, opts)
    shell = Config.get_shell()
    shell_executable = Config.get_shell_executable()
    should_load_config = Config.should_load_config(opts)
    shell_args = build_shell_args_for_script(script_path, shell, should_load_config)
    current_dir = File.cwd!()
    env_vars = Config.build_env_vars_with_asdf()

    port = start_port(shell_executable, shell_args, current_dir, env_vars)
    {output, exit_code, duration} = execute_and_collect_output(port)

    cleanup_script_if_needed(script_path, opts)
    ensure_newline(output)

    build_command_result(shell, command, output, exit_code, duration)
  end

  defp create_session_temp_dir do
    timestamp = System.system_time(:second)
    random = :erlang.unique_integer([:positive, :monotonic])
    tmp_dir = Path.join(System.tmp_dir!(), "argos_#{timestamp}_#{random}")
    File.mkdir_p!(tmp_dir)
    tmp_dir
  end

  defp cleanup_session_temp_dir(tmp_dir) do
    if File.exists?(tmp_dir) do
      File.rm_rf!(tmp_dir)
    end
  rescue
    _ -> :ok
  end

  defp create_temp_script(command, opts) do
    tmp_dir = Keyword.get(opts, :tmp_dir) || create_session_temp_dir()
    script_index = Keyword.get(opts, :script_index, 1)
    script_name = "argos_#{String.pad_leading(to_string(script_index), 3, "0")}.sh"
    script_path = Path.join(tmp_dir, script_name)

    shell = Config.get_shell()
    shell_path = Config.get_shell_executable()
    should_load_config = Config.should_load_config(opts)

    script_content = build_script_content(command, shell, should_load_config, shell_path)
    File.write!(script_path, script_content)
    File.chmod!(script_path, 0o755)

    script_path
  end

  defp build_script_content(command, shell, should_load_config, shell_path) do
    shebang = "#!#{shell_path}\n"
    final_command = escape_command_for_shell(command)

    config_section =
      if should_load_config do
        config_file = Config.get_shell_config_file(shell)
        env_vars_to_preserve = get_env_vars_to_preserve()

        preserve_env_no_path =
          env_vars_to_preserve
          |> Enum.reject(&(&1 == "PATH"))
          |> Enum.map(&build_env_preserve_line/1)
          |> Enum.reject(&is_nil/1)
          |> Enum.join("\n")

        restore_env_no_path =
          env_vars_to_preserve
          |> Enum.reject(&(&1 == "PATH"))
          |> Enum.map(&build_env_restore_line/1)
          |> Enum.reject(&is_nil/1)
          |> Enum.join("\n")

        asdf_setup = build_asdf_setup(shell)
        build_config_section(shell, config_file, preserve_env_no_path, restore_env_no_path, asdf_setup, final_command)
      else
        "#{final_command}\n"
      end

    shebang <> config_section
  end

  defp get_env_vars_to_preserve do
    [
      "PATH",
      "MIX_ENV",
      "MIX_TARGET",
      "ERL_AFLAGS",
      "ERL_FLAGS",
      "ELIXIR_ERL_OPTIONS",
      "ELIXIR_ERL_FLAGS",
      "KERL_BUILD_BACKEND",
      "ASDF_ERLANG_VERSION",
      "ASDF_ELIXIR_VERSION",
      "ASDF_DATA_DIR",
      "ASDF_INSTALL_PATH",
      "ASDF_INSTALL_TYPE",
      "ASDF_DIR",
      "ASDF_CONFIG_FILE",
      "ROOTDIR",
      "EMU"
    ]
  end

  defp build_env_preserve_line(var) do
    case System.get_env(var) do
      nil -> nil
      value -> "ORIG_#{var}='#{escape_single_quotes(value)}'; export ORIG_#{var}"
    end
  end

  defp build_env_restore_line(var) do
    case System.get_env(var) do
      nil -> nil
      value -> "#{var}='#{escape_single_quotes(value)}'; export #{var}"
    end
  end

  defp escape_single_quotes(str) do
    String.replace(str, "'", "'\\''")
  end

  defp escape_command_for_shell(command) do
    command
  end

  defp build_shell_args_for_script(script_path, shell, _should_load_config) do
    if String.contains?(to_string(shell), "zsh") do
      ["-i", script_path]
    else
      [script_path]
    end
  end

  defp build_asdf_setup(shell) do
    if String.contains?(to_string(shell), "zsh") do
      [
        "autoload -U add-zsh-hook; ",
        "asdf_force_detect() { ",
        "  if command -v asdf >/dev/null 2>&1; then ",
        "    local asdf_dir=\"${ASDF_DIR:-$HOME/.asdf}\"; ",
        "    if [[ -d \"$asdf_dir\" ]] && [[ -f \"$asdf_dir/lib/commands/current.bash\" || -f \"$asdf_dir/lib/commands/current.sh\" ]]; then ",
        "      export PATH=\"$asdf_dir/shims:$asdf_dir/bin:$PATH\"; ",
        "      if [[ -f .tool-versions ]]; then ",
        "        source \"$asdf_dir/lib/utils.bash\" 2>/dev/null || source \"$asdf_dir/lib/utils.sh\" 2>/dev/null || true; ",
        "        while IFS= read -r line || [[ -n \"$line\" ]]; do ",
        "          [[ -z \"$line\" ]] || [[ \"$line\" =~ ^[[:space:]]*# ]] && continue; ",
        "          local tool=$(echo \"$line\" | awk '{print $1}'); ",
        "          local version=$(echo \"$line\" | awk '{print $2}'); ",
        "          if [[ -n \"$tool\" && -n \"$version\" ]]; then ",
        "            local tool_path=\"$asdf_dir/installs/$tool/$version/bin\"; ",
        "            if [[ -d \"$tool_path\" ]]; then ",
        "              export PATH=\"$tool_path:$PATH\"; ",
        "            fi; ",
        "          fi; ",
        "        done < .tool-versions; ",
        "      fi; ",
        "    fi; ",
        "  fi; ",
        "}; ",
        "add-zsh-hook chpwd asdf_force_detect; ",
        "asdf_force_detect; "
      ]
      |> Enum.join()
    else
      ""
    end
  end

  defp build_config_section(shell, config_file, preserve_env_no_path, restore_env_no_path, asdf_setup, final_command) do
    is_zsh = String.contains?(to_string(shell), "zsh")
    has_env_vars = preserve_env_no_path != "" && restore_env_no_path != ""

    cond do
      has_env_vars && is_zsh ->
        "# Preservar variables de entorno\n#{preserve_env_no_path}\n" <>
          "# Cargar configuración del shell\nsource #{config_file} 2>/dev/null\n" <>
          "# Restaurar variables de entorno\n#{restore_env_no_path}\n" <>
          "# Habilitar aliases\nsetopt aliases\n" <>
          "# Setup asdf\n#{asdf_setup}\n" <>
          "# Ejecutar comando\n#{final_command}\n"

      has_env_vars ->
        "# Preservar variables de entorno\n#{preserve_env_no_path}\n" <>
          "# Cargar configuración del shell\nsource #{config_file} 2>/dev/null\n" <>
          "# Restaurar variables de entorno\n#{restore_env_no_path}\n" <>
          "# Ejecutar comando\n#{final_command}\n"

      is_zsh ->
        "# Cargar configuración del shell\nsource #{config_file} 2>/dev/null\n" <>
          "# Habilitar aliases\nsetopt aliases\n" <>
          "# Setup asdf\n#{asdf_setup}\n" <>
          "# Ejecutar comando\n#{final_command}\n"

      true ->
        "# Cargar configuración del shell\nsource #{config_file} 2>/dev/null\n" <>
          "# Ejecutar comando\n#{final_command}\n"
    end
  end

  defp cleanup_script_if_needed(script_path, opts) do
    unless Keyword.has_key?(opts, :tmp_dir) do
      cleanup_temp_script(script_path)
    end
  end

  defp cleanup_temp_script(script_path) do
    File.rm(script_path)
    tmp_dir = Path.dirname(script_path)

    if File.exists?(tmp_dir) do
      File.rmdir(tmp_dir)
    end
  rescue
    _ -> :ok
  end

  defp start_port(shell_executable, shell_args, current_dir, env_vars) do
    Port.open({:spawn_executable, shell_executable}, [
      :binary,
      {:args, shell_args},
      {:cd, current_dir},
      {:env, env_vars},
      :exit_status,
      :stderr_to_stdout
    ])
  end

  defp execute_and_collect_output(port) do
    start_time = System.monotonic_time(:millisecond)
    {output, exit_code} = collect_port_output(port, "")
    duration = System.monotonic_time(:millisecond) - start_time
    {output, exit_code, duration}
  end

  defp collect_port_output(port, acc) do
    receive do
      {^port, {:data, data}} ->
        IO.write(data)
        collect_port_output(port, acc <> data)

      {^port, {:exit_status, code}} ->
        {acc, code}

      _other ->
        collect_port_output(port, acc)
    after
      @default_command_timeout ->
        if Port.info(port) != nil do
          Port.close(port)
        end

        {acc, 1}
    end
  end

  defp ensure_newline(output) do
    if output != "" && not String.ends_with?(output, ["\n", "\r\n"]) do
      IO.puts("")
    end
  end

  defp build_command_result(shell, command, output, exit_code, duration) do
    %CommandResult{
      command: shell,
      args: ["-c", command],
      output: output,
      exit_code: exit_code,
      duration: duration,
      success?: exit_code == 0,
      error: nil
    }
  end

  defp extract_project_path_from_command(command) do
    case Regex.run(~r/cd\s+([^\s;&&|]+)/, command) do
      [_, path] ->
        expanded_path = expand_path(path)
        if File.exists?(expanded_path), do: expanded_path, else: nil

      _ ->
        detect_alias_path(command)
    end
  end

  defp expand_path(path) do
    home = System.get_env("HOME") || "~"
    expanded_home = String.replace(path, "~", home)

    Regex.replace(~r/\$\{?(\w+)\}?/, expanded_home, fn _match, var ->
      System.get_env(var) || "${#{var}}"
    end)
  end

  defp detect_alias_path(command) do
    alias_patterns = [
      {"tdai", "/Users/lorenzo.sanchez/workspace/truedat/back/td-ai"},
      {"tdaudit", "/Users/lorenzo.sanchez/workspace/truedat/back/td-audit"},
      {"tdauth", "/Users/lorenzo.sanchez/workspace/truedat/back/td-auth"},
      {"tdbg", "/Users/lorenzo.sanchez/workspace/truedat/back/td-bg"},
      {"tddd", "/Users/lorenzo.sanchez/workspace/truedat/back/td-dd"},
      {"tddf", "/Users/lorenzo.sanchez/workspace/truedat/back/td-df"},
      {"tdi18n", "/Users/lorenzo.sanchez/workspace/truedat/back/td-i18n"},
      {"tdie", "/Users/lorenzo.sanchez/workspace/truedat/back/td-ie"},
      {"tdlm", "/Users/lorenzo.sanchez/workspace/truedat/back/td-lm"},
      {"tdqx", "/Users/lorenzo.sanchez/workspace/truedat/back/td-qx"},
      {"tdse", "/Users/lorenzo.sanchez/workspace/truedat/back/td-se"}
    ]

    Enum.find_value(alias_patterns, fn {alias_name, path} ->
      if String.contains?(command, alias_name) and File.exists?(path), do: path
    end)
  end
end