defmodule EmbeddedDriver do
  use Bitwise

  @type register :: non_neg_integer()
  @type value :: integer()
  @type address :: non_neg_integer()
  @type command :: :start | :stop | :reset | :configure
  @type status :: :idle | :running | :error | :unknown

  defstruct registers: %{}, status: :unknown, config: %{}

  @initial_state %__MODULE__{
    registers: %{
      control: 0x00,
      status: 0x01,
      data: 0x02,
      config: 0x03
    },
    status: :idle,
    config: %{}
  }

  def start_link(opts \\ []) do
    {:ok, pid} = Agent.start_link(fn -> @initial_state end, opts)
    pid
  end

  def initialize(pid) do
    set_register(pid, :control, 0x01)
    update_status(pid, :idle)
  end

  def configure(pid, config_map) when is_map(config_map) do
    Enum.reduce(config_map, :ok, fn {k, v}, acc ->
      case acc do
        :ok -> set_config(pid, k, v)
        _ -> acc
      end
    end)
  end

  def start_operation(pid) do
    with :ok <- check_status(pid, :idle),
         :ok <- set_register(pid, :control, 0x02),
         :ok <- update_status(pid, :running) do
      :ok
    else
      error -> error
    end
  end

  def stop_operation(pid) do
    with :ok <- check_status(pid, :running),
         :ok <- set_register(pid, :control, 0x00),
         :ok <- update_status(pid, :idle) do
      :ok
    else
      error -> error
    end
  end

  def reset(pid) do
    set_register(pid, :control, 0xFF)
    update_status(pid, :unknown)
    :ok
  end

  def read_status(pid) do
    get_register(pid, :status)
  end

  def get_register(pid, reg_name) do
    Agent.get(pid, fn state ->
      Map.get(state.registers, reg_name, nil)
    end)
  end

  def set_register(pid, reg_name, value) when is_atom(reg_name) and is_integer(value) do
    Agent.update(pid, fn state ->
      new_registers = Map.put(state.registers, reg_name, value)
      %{state | registers: new_registers}
    end)
    :ok
  end

  def set_config(pid, key, val) when is_atom(key) do
    Agent.update(pid, fn state ->
      new_config = Map.put(state.config, key, val)
      %{state | config: new_config}
    end)
  end

  def update_status(pid, new_status) when new_status in [:idle, :running, :error, :unknown] do
    Agent.update(pid, fn state ->
      %{state | status: new_status}
    end)
  end

  def check_status(pid, expected_status) do
    current_status = read_status(pid)
    if current_status == expected_status do
      :ok
    else
      {:error, {:status_mismatch, current_status}}
    end
  end

  def perform_command(pid, command) when command in [:start, :stop, :reset, :configure] do
    case command do
      :start -> start_operation(pid)
      :stop -> stop_operation(pid)
      :reset -> reset(pid)
      :configure -> 
        # Placeholder for configuration logic
        configure(pid, %{mode: 1, speed: 100})
    end
  end

  def read_data(pid) do
    get_register(pid, :data)
  end

  def write_data(pid, data) when is_integer(data) do
    set_register(pid, :data, data)
  end

  def perform_dma_transfer(pid, buffer, size) when is_list(buffer) and size > 0 do
    Enum.take(buffer, size)
    |> Enum.each(fn byte ->
      write_data(pid, byte)
    end)
    :ok
  end

  def process_interrupt(pid, irq_type) when irq_type in [:overrun, :underrun, :overflow, :error] do
    case irq_type do
      :overrun -> handle_overrun(pid)
      :underrun -> handle_underrun(pid)
      :overflow -> handle_overflow(pid)
      :error -> handle_error(pid)
    end
  end

  def handle_overrun(pid) do
    update_status(pid, :error)
    notify(:overrun)
  end

  def handle_underrun(pid) do
    update_status(pid, :error)
    notify(:underrun)
  end

  def handle_overflow(pid) do
    update_status(pid, :error)
    notify(:overflow)
  end

  def handle_error(pid) do
    update_status(pid, :error)
    notify(:general_error)
  end

  def notify(event) do
    IO.puts("Notification: #{inspect(event)}")
  end

  def self_test(pid) do
    reset(pid)
    initialize(pid)
    configure(pid, %{mode: 2, speed: 200})
    start_operation(pid)
    :timer.sleep(100)
    stop_operation(pid)
    data = read_data(pid)
    data
  end

  def adjust_timing(pid, factor) when is_float(factor) and factor > 0 do
    current_config = get_config(pid)
    new_speed = Map.get(current_config, :speed, 100) * factor
    set_config(pid, :speed, trunc(new_speed))
    :ok
  end

  def get_config(pid) do
    Agent.get(pid, fn state -> state.config end)
  end

  def stream_data(pid, stream \\ Stream.interval(10)) do
    Stream.resource(
      fn -> nil end,
      fn
        _ -> 
          data = read_data(pid)
          {[data], nil}
      end,
      fn _ -> :ok end
    )
  end

  def monitor(pid, interval_ms \\ 1000) do
    spawn(fn -> monitor_loop(pid, interval_ms) end)
  end

  defp monitor_loop(pid, interval_ms) do
    receive do
    after
      interval_ms ->
        status = read_status(pid)
        IO.puts("Status check: #{inspect(status)}")
        monitor_loop(pid, interval_ms)
    end
  end

  def power_down(pid) do
    set_register(pid, :control, 0x00)
    update_status(pid, :idle)
    :ok
  end

  def calibrate(pid, calibration_value) when is_integer(calibration_value) do
    set_register(pid, :config, calibration_value)
    :ok
  end

  def set_mode(pid, mode) when is_atom(mode) do
    set_config(pid, :mode, mode)
  end

  def get_mode(pid) do
    get_config(pid) |> Map.get(:mode, nil)
  end

  def handle_event(pid, event_type) when event_type in [:data_ready, :error_detected, :thermal_warning] do
    case event_type do
      :data_ready -> IO.puts("Data is ready for processing.")
      :error_detected -> update_status(pid, :error)
      :thermal_warning -> IO.puts("Thermal warning received.")
    end
  end

  def shutdown(pid) do
    power_down(pid)
    Agent.stop(pid)
  end

  def collect_statistics(pid) do
    # Placeholder for stats collection
    %{errors: get_register(pid, :status), data_transferred: 0}
  end

  def run_self_test(pid) do
    self_test(pid)
  end

  def optimize_performance(pid, params) when is_map(params) do
    Enum.each(params, fn {k, v} ->
      set_config(pid, k, v)
    end)
    :ok
  end

  def support_feature?(pid, feature) when is_atom(feature) do
    supported_features = [:dma, :interrupts, :power_management, :calibration]
    feature in supported_features
  end

  def handle_power_event(pid, event_type) when event_type in [:power_on, :power_off, :sleep] do
    case event_type do
      :power_on -> update_status(pid, :idle)
      :power_off -> power_down(pid)
      :sleep -> update_status(pid, :sleeping)
    end
  end

  def set_sleep_mode(pid, enabled) when is_boolean(enabled) do
    set_config(pid, :sleep_mode, enabled)
  end

  def get_sleep_mode(pid) do
    get_config(pid) |> Map.get(:sleep_mode, false)
  end

  defperform_bulk_ops(pids, cmd) when is_list(pids) and is_atom(cmd) do
    Enum.each(pids, fn pid ->
      perform_command(pid, cmd)
    end)
  end

  def bulk_configure(pids, configs) when is_list(pids) and is_list(configs) do
    Enum.zip(pids, configs)