raxol

defmodule Raxol.Core.Renderer.View.Layout.Flex do
  @moduledoc """
  Handles flex layout functionality for the Raxol view system.
  Provides row and column layouts with various alignment and justification options.
  """

  @doc """
  Creates a row layout container that arranges its children horizontally.

  ## Options
    * `:children` - List of child views to arrange horizontally
    * `:align` - Alignment of children (:start, :center, :end)
    * `:justify` - Justification of children (:start, :center, :end, :space_between)
    * `:gap` - Space between children (integer)

  ## Examples

      Flex.row(children: [view1, view2])
      Flex.row(align: :center, justify: :space_between, children: [view1, view2])
  """
  def row(opts \\ []) do
    children = Keyword.get(opts, :children, [])
    align = Keyword.get(opts, :align, :start)
    justify = Keyword.get(opts, :justify, :start)
    gap = Keyword.get(opts, :gap, 0)
    style = Keyword.get(opts, :style, [])

    %{
      type: :flex,
      direction: :row,
      align: align,
      justify: justify,
      gap: gap,
      style: style,
      children: children
    }
  end

  @doc """
  Creates a flex container that arranges its children in the specified direction.

  ## Options
    * `:direction` - Direction of flex layout (:row or :column)
    * `:children` - List of child views
    * `:align` - Alignment of children (:start, :center, :end)
    * `:justify` - Justification of children (:start, :center, :end, :space_between)
    * `:gap` - Space between children (integer)
    * `:wrap` - Whether to wrap children (boolean)

  ## Examples

      Flex.container(direction: :row, children: [view1, view2])
      Flex.container(direction: :column, align: :center, children: [view1, view2])
  """
  def container(opts) do
    direction = Keyword.get(opts, :direction, :row)
    # Get raw children from opts
    raw_children = Keyword.get(opts, :children)

    processed_children =
      cond do
        is_list(raw_children) -> raw_children
        # Default to empty list if nil
        is_nil(raw_children) -> []
        # Wrap single child in a list
        true -> [raw_children]
      end

    align = Keyword.get(opts, :align, :start)
    justify = Keyword.get(opts, :justify, :start)
    gap = Keyword.get(opts, :gap, 0)
    wrap = Keyword.get(opts, :wrap, false)
    style = Keyword.get(opts, :style, [])

    %{
      type: :flex,
      direction: direction,
      align: align,
      justify: justify,
      gap: gap,
      wrap: wrap,
      style: style,
      # Use the processed list of children
      children: processed_children
    }
  end

  @doc """
  Creates a column layout container that arranges its children vertically.

  ## Options
    * `:children` - List of child views to arrange vertically
    * `:align` - Alignment of children (:start, :center, :end)
    * `:justify` - Justification of children (:start, :center, :end, :space_between)
    * `:gap` - Space between children (integer)

  ## Examples

      Flex.column(children: [view1, view2])
      Flex.column(align: :center, justify: :space_between, children: [view1, view2])
  """
  def column(opts \\ []) do
    children = Keyword.get(opts, :children, [])
    align = Keyword.get(opts, :align, :start)
    justify = Keyword.get(opts, :justify, :start)
    gap = Keyword.get(opts, :gap, 0)
    style = Keyword.get(opts, :style, [])

    %{
      type: :flex,
      direction: :column,
      align: align,
      justify: justify,
      gap: gap,
      style: style,
      children: children
    }
  end

  @doc """
  Calculates the layout of flex children based on container size and options.
  """
  def calculate_layout(_container, _size) do
    # Implementation of flex layout algorithm
    # This would handle:
    # - Direction (row/column)
    # - Alignment
    # - Justification
    # - Gap spacing
    # - Wrapping
    # Returns a list of positioned children
    []
  end
end