defmodule Raxol.Terminal.Cursor.Movement do
  @moduledoc """
  Handles cursor movement and positioning for the terminal emulator.

  This module provides functions for moving the cursor in various directions,
  handling relative and absolute positioning, and managing cursor boundaries.
  """

  alias Raxol.Terminal.Cursor.Manager

  @doc """
  Moves the cursor up by the specified number of lines.

  ## Examples

      iex> alias Raxol.Terminal.Cursor.{Manager, Movement}
      iex> cursor = Manager.new()
      iex> cursor = Movement.move_up(cursor, 2)
      iex> cursor.position
      {0, 0}  # Already at top, no change
  """
  def move_up(%Manager{} = cursor, n \\ 1) do
    {x, y} = cursor.position
    new_y = max(0, y - n)
    Manager.move_to(cursor, x, new_y)
  end

  @doc """
  Moves the cursor down by the specified number of lines.

  ## Examples

      iex> alias Raxol.Terminal.Cursor.{Manager, Movement}
      iex> cursor = Manager.new()
      iex> cursor = Movement.move_down(cursor, 2)
      iex> cursor.position
      {0, 2}
  """
  def move_down(%Manager{} = cursor, n \\ 1) do
    {x, y} = cursor.position
    new_y = y + n
    Manager.move_to(cursor, x, new_y)
  end

  @doc """
  Moves the cursor left by the specified number of columns.

  ## Examples

      iex> alias Raxol.Terminal.Cursor.{Manager, Movement}
      iex> cursor = Manager.new()
      iex> cursor = Manager.move_to(cursor, 5, 0)
      iex> cursor = Movement.move_left(cursor, 2)
      iex> cursor.position
      {3, 0}
  """
  def move_left(%Manager{} = cursor, n \\ 1) do
    {x, y} = cursor.position
    new_x = max(0, x - n)
    Manager.move_to(cursor, new_x, y)
  end

  @doc """
  Moves the cursor right by the specified number of columns.

  ## Examples

      iex> alias Raxol.Terminal.Cursor.{Manager, Movement}
      iex> cursor = Manager.new()
      iex> cursor = Movement.move_right(cursor, 2)
      iex> cursor.position
      {2, 0}
  """
  def move_right(%Manager{} = cursor, n \\ 1) do
    {x, y} = cursor.position
    new_x = x + n
    Manager.move_to(cursor, new_x, y)
  end

  @doc """
  Moves the cursor to the beginning of the line.

  ## Examples

      iex> alias Raxol.Terminal.Cursor.{Manager, Movement}
      iex> cursor = Manager.new()
      iex> cursor = Manager.move_to(cursor, 10, 0)
      iex> cursor = Movement.move_to_line_start(cursor)
      iex> cursor.position
      {0, 0}
  """
  def move_to_line_start(%Manager{} = cursor) do
    {_, y} = cursor.position
    Manager.move_to(cursor, 0, y)
  end

  @doc """
  Moves the cursor to the end of the line.

  ## Examples

      iex> alias Raxol.Terminal.Cursor.{Manager, Movement}
      iex> cursor = Manager.new()
      iex> cursor = Movement.move_to_line_end(cursor, 80)
      iex> cursor.position
      {79, 0}
  """
  def move_to_line_end(%Manager{} = cursor, line_width) do
    {_, y} = cursor.position
    Manager.move_to(cursor, line_width - 1, y)
  end

  @doc """
  Moves the cursor to the specified column.

  ## Examples

      iex> alias Raxol.Terminal.Cursor.{Manager, Movement}
      iex> cursor = Manager.new()
      iex> cursor = Movement.move_to_column(cursor, 10)
      iex> cursor.position
      {10, 0}
  """
  def move_to_column(%Manager{} = cursor, column) do
    {_, y} = cursor.position
    Manager.move_to(cursor, column, y)
  end

  @doc """
  Moves the cursor to the specified line.

  ## Examples

      iex> alias Raxol.Terminal.Cursor.{Manager, Movement}
      iex> cursor = Manager.new()
      iex> cursor = Movement.move_to_line(cursor, 5)
      iex> cursor.position
      {0, 5}
  """
  def move_to_line(%Manager{} = cursor, line) do
    {x, _} = cursor.position
    Manager.move_to(cursor, x, line)
  end

  @doc """
  Moves the cursor to the specified position.

  ## Examples

      iex> alias Raxol.Terminal.Cursor.{Manager, Movement}
      iex> cursor = Manager.new()
      iex> cursor = Movement.move_to_position(cursor, 10, 5)
      iex> cursor.position
      {10, 5}
  """
  def move_to_position(%Manager{} = cursor, column, line) do
    Manager.move_to(cursor, column, line)
  end

  @doc """
  Moves the cursor to the home position (0, 0).

  ## Examples

      iex> alias Raxol.Terminal.Cursor.{Manager, Movement}
      iex> cursor = Manager.new()
      iex> cursor = Manager.move_to(cursor, 10, 5)
      iex> cursor = Movement.move_home(cursor)
      iex> cursor.position
      {0, 0}
  """
  def move_home(%Manager{} = cursor) do
    Manager.move_to(cursor, 0, 0)
  end

  @doc """
  Moves the cursor to the next tab stop.

  ## Examples

      iex> alias Raxol.Terminal.Cursor.{Manager, Movement}
      iex> cursor = Manager.new()
      iex> cursor = Movement.move_to_next_tab(cursor, 8)
      iex> cursor.position
      {8, 0}
  """
  def move_to_next_tab(%Manager{} = cursor, tab_size \\ 8) do
    {x, y} = cursor.position
    next_tab = div(x, tab_size) * tab_size + tab_size
    Manager.move_to(cursor, next_tab, y)
  end

  @doc """
  Moves the cursor to the previous tab stop.

  ## Examples

      iex> alias Raxol.Terminal.Cursor.{Manager, Movement}
      iex> cursor = Manager.new()
      iex> cursor = Manager.move_to(cursor, 10, 0)
      iex> cursor = Movement.move_to_prev_tab(cursor, 8)
      iex> cursor.position
      {8, 0}
  """
  def move_to_prev_tab(%Manager{} = cursor, tab_size \\ 8) do
    {x, y} = cursor.position
    prev_tab = div(x, tab_size) * tab_size
    Manager.move_to(cursor, prev_tab, y)
  end
end