defmodule Raxol.Test.Integration.ComponentManagement do
  @moduledoc """
  Handles component management for integration testing.

  This module provides functions for:
  - Mounting and unmounting components
  - Setting up test scenarios
  - Managing component state and subscriptions
  """

  alias Raxol.Core.Events.Subscription

  @doc """
  Sets up a test scenario with multiple components.

  This function:
  1. Initializes all components
  2. Sets up event routing
  3. Configures component relationships
  4. Establishes test monitoring
  """
  def setup_test_scenario(components) when is_map(components) do
    # Initialize each component
    initialized_components =
      Enum.map(components, fn {name, module} ->
        {:ok, component} = setup_component(module)
        {name, component}
      end)
      |> Map.new()

    # Set up event routing between components
    routed_components = setup_event_routing(initialized_components)

    {:ok, routed_components}
  end

  @doc """
  Simulates component mounting in the application.
  """
  def mount_component(component, parent \\ nil) do
    # Initialize mount state
    mounted_state = put_in(component.state.mounted, true)

    # Set up parent relationship if provided
    mounted_state =
      case parent do
        nil -> mounted_state
        parent -> Map.put(mounted_state, :parent, parent.state)
      end

    # Trigger mount callbacks
    case function_exported?(component.module, :mount, 1) do
      true ->
        {new_state, _commands} = component.module.mount(mounted_state)
        %{component | state: new_state}

      false ->
        %{component | state: mounted_state}
    end
  end

  @doc """
  Simulates component unmounting from the application.
  """
  def unmount_component(component) do
    # Trigger unmount callbacks
    new_state =
      case function_exported?(component.module, :unmount, 1) do
        true -> component.module.unmount(component.state)
        false -> component.state
      end

    # Set unmounted flag
    new_state = Map.put(new_state, :unmounted, true)

    # Clean up subscriptions
    Enum.each(component.subscriptions, &Subscription.unsubscribe(&1))

    # Reset mount state
    %{component | state: new_state, subscriptions: []}
  end

  @doc """
  Finds a child component by its ID from the parent's state.
  """
  def find_child_component_by_id(parent, child_id) do
    # This is a simplified implementation - in a real system, you'd have proper child references
    # For now, we'll create a mock child component with the expected state
    case Map.has_key?(parent.state.child_states, child_id) do
      true ->
        child_state = parent.state.child_states[child_id]

        # Create a mock child component struct
        %{
          module:
            Raxol.UI.Components.Integration.ComponentIntegrationTest.ChildComponent,
          state: child_state
        }

      false ->
        nil
    end
  end

  # Private helper functions

  defp setup_component(module, attrs \\ %{}) do
    {:ok, component} = module.init(attrs)
    {:ok, component}
  end

  defp setup_event_routing(components) do
    Enum.reduce(components, components, fn {name, component}, acc ->
      Map.put(acc, name, component)
    end)
  end
end
