defmodule Raxol.Plugins.PluginSystemV2 do
  @moduledoc """
  Plugin System v2.0 - Advanced plugin management with enhanced features.

  Key Features:
  - Hot-reload with dependency resolution
  - Version-aware dependency management
  - Sandboxed execution for untrusted plugins
  - Plugin marketplace integration
  - Advanced lifecycle management
  - Performance monitoring and isolation
  """

  use Raxol.Core.Behaviours.BaseManager
  # Aliases will be used when implementing full functionality
  # alias Raxol.Plugins.{Plugin, PluginDependency}
  # alias Raxol.Core.Runtime.Plugins.PluginManager

  @type plugin_id :: String.t()
  @type version :: String.t()
  @type dependency_spec :: {plugin_id(), version_requirement()}
  # e.g., "^1.0.0", "~> 2.1", ">= 1.2.0"
  @type version_requirement :: String.t()

  @type plugin_manifest :: %{
          name: String.t(),
          version: version(),
          description: String.t(),
          author: String.t(),
          license: String.t(),
          repository: String.t(),
          api_version: version(),
          dependencies: [dependency_spec()],
          dev_dependencies: [dependency_spec()],
          capabilities: [atom()],
          sandbox_required: boolean(),
          trust_level: :trusted | :sandboxed | :untrusted,
          entry_point: atom(),
          hooks: [atom()],
          metadata: map()
        }

  @type plugin_state :: %{
          manifest: plugin_manifest(),
          status:
            :loaded | :starting | :running | :stopping | :stopped | :failed,
          module: atom(),
          process: pid() | nil,
          supervisor: pid() | nil,
          dependencies: [plugin_id()],
          dependents: [plugin_id()],
          last_reload: DateTime.t(),
          sandbox_context: map() | nil,
          performance_metrics: map()
        }

  defstruct plugins: %{},
            dependency_graph: %{},
            load_order: [],
            marketplace_client: nil,
            sandbox_supervisor: nil,
            file_watcher: nil,
            performance_monitor: nil

  # Plugin System v2.0 API

  @doc """
  Installs a plugin from the marketplace or local source.
  """
  def install_plugin(source, opts \\ []) do
    GenServer.call(__MODULE__, {:install_plugin, source, opts})
  end

  @doc """
  Loads a plugin with dependency resolution.
  """
  def load_plugin(plugin_id, opts \\ []) do
    GenServer.call(__MODULE__, {:load_plugin, plugin_id, opts})
  end

  @doc """
  Hot-reloads a plugin while preserving state.
  """
  def hot_reload_plugin(plugin_id, opts \\ []) do
    GenServer.call(__MODULE__, {:hot_reload_plugin, plugin_id, opts})
  end

  @doc """
  Manages plugin dependencies with version resolution.
  """
  def resolve_dependencies(plugin_manifest) do
    GenServer.call(__MODULE__, {:resolve_dependencies, plugin_manifest})
  end

  @doc """
  Gets plugin status and performance metrics.
  """
  def get_plugin_status(plugin_id) do
    GenServer.call(__MODULE__, {:get_plugin_status, plugin_id})
  end

  @doc """
  Lists available plugins from marketplace.
  """
  def list_marketplace_plugins(filters \\ %{}) do
    GenServer.call(__MODULE__, {:list_marketplace_plugins, filters})
  end

  @doc """
  Creates a sandboxed environment for untrusted plugins.
  """
  def create_sandbox(plugin_id, security_policy) do
    GenServer.call(__MODULE__, {:create_sandbox, plugin_id, security_policy})
  end

  # GenServer Implementation

  @impl Raxol.Core.Behaviours.BaseManager
  def init_manager(opts) do
    state = %__MODULE__{
      plugins: %{},
      dependency_graph: build_dependency_graph(%{}),
      load_order: [],
      marketplace_client: initialize_marketplace_client(opts),
      sandbox_supervisor: start_sandbox_supervisor(opts),
      file_watcher: start_enhanced_file_watcher(opts),
      performance_monitor: start_performance_monitor(opts)
    }

    Log.info("Initialized with enhanced capabilities")
    {:ok, state}
  end

  @impl Raxol.Core.Behaviours.BaseManager
  def handle_manager_call({:install_plugin, source, opts}, _from, state) do
    case install_plugin_impl(source, opts, state) do
      {:ok, updated_state} ->
        {:reply, :ok, updated_state}

      {:error, reason} ->
        {:reply, {:error, reason}, state}
    end
  end

  def handle_manager_call({:load_plugin, plugin_id, opts}, _from, state) do
    case load_plugin_with_deps(plugin_id, opts, state) do
      {:ok, updated_state} ->
        {:reply, :ok, updated_state}

      {:error, reason} ->
        {:reply, {:error, reason}, state}
    end
  end

  def handle_manager_call({:hot_reload_plugin, plugin_id, opts}, _from, state) do
    case hot_reload_plugin_impl(plugin_id, opts, state) do
      {:ok, updated_state} ->
        {:reply, :ok, updated_state}

      {:error, reason} ->
        {:reply, {:error, reason}, state}
    end
  end

  def handle_manager_call({:resolve_dependencies, manifest}, _from, state) do
    case resolve_dependencies_impl(manifest, state) do
      {:ok, resolution} ->
        {:reply, {:ok, resolution}, state}

      {:error, reason} ->
        {:reply, {:error, reason}, state}
    end
  end

  def handle_manager_call({:get_plugin_status, plugin_id}, _from, state) do
    status = get_plugin_status_impl(plugin_id, state)
    {:reply, {:ok, status}, state}
  end

  def handle_manager_call({:list_marketplace_plugins, filters}, _from, state) do
    case list_marketplace_plugins_impl(filters, state) do
      {:ok, plugins} ->
        {:reply, {:ok, plugins}, state}

      {:error, reason} ->
        {:reply, {:error, reason}, state}
    end
  end

  def handle_manager_call(
        {:create_sandbox, plugin_id, security_policy},
        _from,
        state
      ) do
    case create_sandbox_impl(plugin_id, security_policy, state) do
      {:ok, updated_state} ->
        {:reply, :ok, updated_state}

      {:error, reason} ->
        {:reply, {:error, reason}, state}
    end
  end

  # Implementation Functions (Private)

  defp install_plugin_impl(source, _opts, state) do
    # Implementation will be added in next steps
    Log.info("Installing plugin from #{inspect(source)}")
    {:ok, state}
  end

  defp load_plugin_with_deps(plugin_id, _opts, state) do
    # Implementation will be added in next steps
    Log.info("[PluginSystemV2] Loading plugin with dependencies: #{plugin_id}")

    {:ok, state}
  end

  defp hot_reload_plugin_impl(plugin_id, _opts, state) do
    # Implementation will be added in next steps
    Log.info("Hot-reloading plugin: #{plugin_id}")
    {:ok, state}
  end

  defp resolve_dependencies_impl(manifest, _state) do
    # Implementation will be added in next steps
    Log.info("Resolving dependencies for #{manifest.name}")
    {:ok, []}
  end

  defp get_plugin_status_impl(plugin_id, state) do
    case Map.get(state.plugins, plugin_id) do
      nil ->
        %{status: :not_found}

      plugin_state ->
        %{
          status: plugin_state.status,
          version: plugin_state.manifest.version,
          dependencies: plugin_state.dependencies,
          performance: plugin_state.performance_metrics,
          last_reload: plugin_state.last_reload
        }
    end
  end

  defp list_marketplace_plugins_impl(filters, _state) do
    # Implementation will be added in next steps
    Log.info(
      "[PluginSystemV2] Listing marketplace plugins with filters: #{inspect(filters)}"
    )

    {:ok, []}
  end

  defp create_sandbox_impl(plugin_id, _security_policy, state) do
    # Implementation will be added in next steps
    Log.info("Creating sandbox for #{plugin_id}")
    {:ok, state}
  end

  # Helper Functions

  defp build_dependency_graph(_plugins) do
    # Build directed acyclic graph of plugin dependencies
    %{}
  end

  defp initialize_marketplace_client(opts) do
    # Initialize client for plugin marketplace
    case Keyword.get(opts, :marketplace_enabled, true) do
      # Will be implemented
      true -> :mock_client
      false -> nil
    end
  end

  defp start_sandbox_supervisor(opts) do
    # Start supervisor for sandboxed plugin processes
    case Keyword.get(opts, :sandbox_enabled, true) do
      # Will be implemented
      true -> :mock_supervisor
      false -> nil
    end
  end

  defp start_enhanced_file_watcher(opts) do
    # Enhanced file watcher with dependency tracking
    case Keyword.get(opts, :hot_reload_enabled, true) do
      # Will be implemented
      true -> :mock_watcher
      false -> nil
    end
  end

  defp start_performance_monitor(opts) do
    # Performance monitoring for plugin resource usage
    case Keyword.get(opts, :performance_monitoring, true) do
      # Will be implemented
      true -> :mock_monitor
      false -> nil
    end
  end
end
