defmodule Raxol.Plugins.MarketplaceClient do
  @moduledoc """
  Plugin Marketplace client for Plugin System v2.0.

  Features:
  - Plugin discovery and search
  - Version management and updates
  - Security verification and signatures
  - Dependency resolution integration
  - User reviews and ratings
  - Installation and uninstallation
  - License compliance checking
  """

  use Raxol.Core.Behaviours.BaseManager
  alias Raxol.Plugins.{DependencyResolverV2, PluginSandbox}
  alias Raxol.Core.Runtime.Log

  @type plugin_id :: String.t()
  @type version :: String.t()
  @type search_filters :: %{
          category: String.t() | nil,
          author: String.t() | nil,
          rating_min: float() | nil,
          license: String.t() | nil,
          tags: [String.t()] | nil,
          compatibility: String.t() | nil
        }

  @type marketplace_plugin :: %{
          id: plugin_id(),
          name: String.t(),
          version: version(),
          description: String.t(),
          author: String.t(),
          license: String.t(),
          category: String.t(),
          tags: [String.t()],
          rating: float(),
          downloads: non_neg_integer(),
          repository: String.t(),
          documentation: String.t(),
          screenshots: [String.t()],
          dependencies: [String.t()],
          api_compatibility: String.t(),
          trust_level: :trusted | :verified | :community | :unverified,
          signature: String.t() | nil,
          checksum: String.t(),
          size_bytes: non_neg_integer(),
          published_at: DateTime.t(),
          updated_at: DateTime.t()
        }

  defstruct marketplace_url: nil,
            api_key: nil,
            cache: %{},
            installed_plugins: %{},
            update_notifications: [],
            security_policies: %{},
            download_cache_dir: nil

  # Marketplace API

  # start_link is provided by BaseManager

  @doc """
  Searches for plugins in the marketplace.
  """
  def search_plugins(query, filters \\ %{}) do
    GenServer.call(__MODULE__, {:search_plugins, query, filters})
  end

  @doc """
  Gets detailed information about a specific plugin.
  """
  def get_plugin_info(plugin_id, version \\ "latest") do
    GenServer.call(__MODULE__, {:get_plugin_info, plugin_id, version})
  end

  @doc """
  Lists all available versions of a plugin.
  """
  def list_plugin_versions(plugin_id) do
    GenServer.call(__MODULE__, {:list_plugin_versions, plugin_id})
  end

  @doc """
  Downloads and installs a plugin from the marketplace.
  """
  def install_plugin(plugin_id, version \\ "latest", opts \\ %{}) do
    GenServer.call(
      __MODULE__,
      {:install_plugin, plugin_id, version, opts},
      60_000
    )
  end

  @doc """
  Uninstalls a plugin and cleans up dependencies.
  """
  def uninstall_plugin(plugin_id) do
    GenServer.call(__MODULE__, {:uninstall_plugin, plugin_id})
  end

  @doc """
  Updates a plugin to the latest version.
  """
  def update_plugin(plugin_id, opts \\ %{}) do
    GenServer.call(__MODULE__, {:update_plugin, plugin_id, opts}, 60_000)
  end

  @doc """
  Checks for available updates for installed plugins.
  """
  def check_for_updates do
    GenServer.call(__MODULE__, :check_for_updates)
  end

  @doc """
  Lists installed plugins with their marketplace status.
  """
  def list_installed_plugins do
    GenServer.call(__MODULE__, :list_installed_plugins)
  end

  @doc """
  Verifies plugin signature and security.
  """
  def verify_plugin_security(plugin_id, version) do
    GenServer.call(__MODULE__, {:verify_plugin_security, plugin_id, version})
  end

  @doc """
  Gets user reviews and ratings for a plugin.
  """
  def get_plugin_reviews(plugin_id) do
    GenServer.call(__MODULE__, {:get_plugin_reviews, plugin_id})
  end

  @doc """
  Submits a review for a plugin (requires authentication).
  """
  def submit_plugin_review(plugin_id, rating, review_text) do
    GenServer.call(
      __MODULE__,
      {:submit_plugin_review, plugin_id, rating, review_text}
    )
  end

  # GenServer Implementation

  @impl true
  def init_manager(opts) do
    state = %__MODULE__{
      marketplace_url:
        Keyword.get(opts, :marketplace_url, default_marketplace_url()),
      api_key: Keyword.get(opts, :api_key),
      cache: %{},
      installed_plugins: load_installed_plugins(),
      update_notifications: [],
      security_policies: load_security_policies(),
      download_cache_dir: Keyword.get(opts, :cache_dir, default_cache_dir())
    }

    # Schedule periodic update checks
    schedule_update_check()

    Log.info(
      "[MarketplaceClient] Initialized with marketplace: #{state.marketplace_url}"
    )

    {:ok, state}
  end

  @impl true
  def handle_manager_call({:search_plugins, query, filters}, _from, state) do
    case search_plugins_impl(query, filters, state) do
      {:ok, results} ->
        {:reply, {:ok, results}, state}

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

  @impl true
  def handle_manager_call({:get_plugin_info, plugin_id, version}, _from, state) do
    case get_plugin_info_impl(plugin_id, version, state) do
      {:ok, plugin_info} ->
        # Update cache
        cache_key = {plugin_id, version}

        updated_cache =
          Map.put(state.cache, cache_key, {plugin_info, DateTime.utc_now()})

        {:reply, {:ok, plugin_info}, %{state | cache: updated_cache}}

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

  @impl true
  def handle_manager_call({:list_plugin_versions, plugin_id}, _from, state) do
    case list_plugin_versions_impl(plugin_id, state) do
      {:ok, versions} ->
        {:reply, {:ok, versions}, state}

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

  @impl true
  def handle_manager_call(
        {:install_plugin, plugin_id, version, opts},
        _from,
        state
      ) do
    case install_plugin_impl(plugin_id, version, opts, state) do
      {:ok, updated_state} ->
        Log.info(
          "[MarketplaceClient] Successfully installed #{plugin_id}@#{version}"
        )

        {:reply, :ok, updated_state}

      {:error, reason} ->
        Log.error(
          "[MarketplaceClient] Failed to install #{plugin_id}@#{version}: #{inspect(reason)}"
        )

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

  @impl true
  def handle_manager_call({:uninstall_plugin, plugin_id}, _from, state) do
    case uninstall_plugin_impl(plugin_id, state) do
      {:ok, updated_state} ->
        Log.info("Successfully uninstalled #{plugin_id}")
        {:reply, :ok, updated_state}

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

  @impl true
  def handle_manager_call({:update_plugin, plugin_id, opts}, _from, state) do
    case update_plugin_impl(plugin_id, opts, state) do
      {:ok, updated_state} ->
        {:reply, :ok, updated_state}

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

  @impl true
  def handle_manager_call(:check_for_updates, _from, state) do
    case check_for_updates_impl(state) do
      {:ok, updates, updated_state} ->
        {:reply, {:ok, updates}, updated_state}

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

  @impl true
  def handle_manager_call(:list_installed_plugins, _from, state) do
    installed_with_status =
      add_marketplace_status(state.installed_plugins, state)

    {:reply, {:ok, installed_with_status}, state}
  end

  @impl true
  def handle_manager_call(
        {:verify_plugin_security, plugin_id, version},
        _from,
        state
      ) do
    case verify_plugin_security_impl(plugin_id, version, state) do
      {:ok, verification_result} ->
        {:reply, {:ok, verification_result}, state}

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

  @impl true
  def handle_manager_call({:get_plugin_reviews, plugin_id}, _from, state) do
    case get_plugin_reviews_impl(plugin_id, state) do
      {:ok, reviews} ->
        {:reply, {:ok, reviews}, state}

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

  @impl true
  def handle_manager_call(
        {:submit_plugin_review, plugin_id, rating, review_text},
        _from,
        state
      ) do
    case submit_plugin_review_impl(plugin_id, rating, review_text, state) do
      {:ok, review} ->
        {:reply, {:ok, review}, state}

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

  @impl true
  def handle_manager_info(:check_updates, state) do
    case check_for_updates_impl(state) do
      {:ok, updates, updated_state} ->
        if length(updates) > 0 do
          Log.info(
            "[MarketplaceClient] Found #{length(updates)} plugin updates available"
          )
        end

        schedule_update_check()
        {:noreply, updated_state}

      {:error, reason} ->
        Log.error(
          "[MarketplaceClient] Failed to check for updates: #{inspect(reason)}"
        )

        schedule_update_check()
        {:noreply, state}
    end
  end

  # Private Implementation

  defp search_plugins_impl(query, filters, _state) do
    # Mock implementation - would make HTTP request to marketplace
    Log.debug("Searching for plugins: #{query}")

    # Simulate marketplace response
    mock_results = [
      %{
        id: "terminal-themes",
        name: "Terminal Themes",
        version: "2.1.0",
        description: "Beautiful color themes for your terminal",
        author: "theme-creator",
        license: "MIT",
        category: "Appearance",
        tags: ["themes", "colors", "ui"],
        rating: 4.8,
        downloads: 12543,
        trust_level: :verified
      },
      %{
        id: "git-integration",
        name: "Git Integration",
        version: "1.5.4",
        description: "Seamless Git integration with status display",
        author: "git-dev",
        license: "Apache-2.0",
        category: "Development",
        tags: ["git", "vcs", "development"],
        rating: 4.6,
        downloads: 8921,
        trust_level: :trusted
      }
    ]

    filtered_results = apply_search_filters(mock_results, filters)
    {:ok, filtered_results}
  end

  defp get_plugin_info_impl(plugin_id, version, state) do
    # Check cache first
    cache_key = {plugin_id, version}

    case Map.get(state.cache, cache_key) do
      {cached_info, cached_at} ->
        # Check if cache is still valid (1 hour)
        if DateTime.diff(DateTime.utc_now(), cached_at, :second) < 3600 do
          {:ok, cached_info}
        else
          fetch_plugin_info_from_marketplace(plugin_id, version, state)
        end

      nil ->
        fetch_plugin_info_from_marketplace(plugin_id, version, state)
    end
  end

  defp fetch_plugin_info_from_marketplace(plugin_id, version, _state) do
    # Mock implementation - would make HTTP request
    Log.debug(
      "[MarketplaceClient] Fetching plugin info: #{plugin_id}@#{version}"
    )

    case plugin_id do
      "terminal-themes" ->
        {:ok,
         %{
           id: plugin_id,
           name: "Terminal Themes",
           version: version,
           description: "Beautiful color themes for your terminal emulator",
           author: "theme-creator",
           license: "MIT",
           category: "Appearance",
           tags: ["themes", "colors", "ui", "customization"],
           rating: 4.8,
           downloads: 12543,
           repository: "https://github.com/theme-creator/terminal-themes",
           documentation: "https://terminal-themes.dev/docs",
           screenshots: ["https://cdn.marketplace.com/screenshots/themes-1.png"],
           dependencies: [],
           api_compatibility: "^1.0.0",
           trust_level: :verified,
           signature: "signature-hash-here",
           checksum: "sha256:abcd1234...",
           size_bytes: 2_048_576,
           published_at: ~U[2023-01-15 10:30:00Z],
           updated_at: ~U[2023-09-20 14:45:00Z]
         }}

      _other ->
        {:error, :plugin_not_found}
    end
  end

  defp install_plugin_impl(plugin_id, version, opts, state) do
    # 1. Get plugin info
    case get_plugin_info_impl(plugin_id, version, state) do
      {:ok, plugin_info} ->
        # 2. Verify security
        case verify_plugin_security_impl(plugin_id, version, state) do
          {:ok, security_result} ->
            if security_result.safe do
              # 3. Resolve dependencies
              case resolve_plugin_dependencies(plugin_info) do
                {:ok, dependencies} ->
                  # 4. Download and install
                  case download_and_install_plugin(
                         plugin_info,
                         dependencies,
                         opts,
                         state
                       ) do
                    {:ok, updated_state} ->
                      {:ok, updated_state}

                    {:error, reason} ->
                      {:error, {:installation_failed, reason}}
                  end

                {:error, reason} ->
                  {:error, {:dependency_resolution_failed, reason}}
              end
            else
              {:error, {:security_verification_failed, security_result.issues}}
            end

          {:error, reason} ->
            {:error, {:security_check_failed, reason}}
        end

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

  defp download_and_install_plugin(plugin_info, dependencies, _opts, state) do
    # Mock implementation - would download and install plugin
    Log.info(
      "[MarketplaceClient] Installing #{plugin_info.name} with #{length(dependencies)} dependencies"
    )

    # Simulate successful installation
    installation_info = %{
      plugin_id: plugin_info.id,
      version: plugin_info.version,
      installed_at: DateTime.utc_now(),
      installation_path: "/path/to/plugins/#{plugin_info.id}",
      dependencies: dependencies
    }

    updated_installed =
      Map.put(state.installed_plugins, plugin_info.id, installation_info)

    {:ok, %{state | installed_plugins: updated_installed}}
  end

  defp resolve_plugin_dependencies(plugin_info) do
    # Use dependency resolver to resolve plugin dependencies
    case DependencyResolverV2.resolve_dependencies(plugin_info, %{}) do
      {:ok, resolved} -> {:ok, resolved}
      error -> error
    end
  end

  defp verify_plugin_security_impl(plugin_id, version, _state) do
    # Mock implementation - would verify signatures and check security
    Log.debug(
      "[MarketplaceClient] Verifying security for #{plugin_id}@#{version}"
    )

    security_result = %{
      safe: true,
      trust_level: :verified,
      signature_valid: true,
      checksum_valid: true,
      issues: [],
      scanned_at: DateTime.utc_now()
    }

    {:ok, security_result}
  end

  defp check_for_updates_impl(state) do
    # Check each installed plugin for updates
    updates =
      Enum.reduce(state.installed_plugins, [], fn {plugin_id, install_info},
                                                  acc ->
        case check_plugin_update(plugin_id, install_info.version, state) do
          # No update available
          {:ok, nil} -> acc
          {:ok, update_info} -> [update_info | acc]
          # Skip errors
          {:error, _reason} -> acc
        end
      end)

    # Update notification list
    updated_notifications = updates ++ state.update_notifications
    updated_state = %{state | update_notifications: updated_notifications}

    {:ok, updates, updated_state}
  end

  defp check_plugin_update(plugin_id, current_version, state) do
    case list_plugin_versions_impl(plugin_id, state) do
      {:ok, versions} ->
        latest_version = Enum.max_by(versions, &Version.parse!/1, Version)

        if Version.compare(latest_version, current_version) == :gt do
          {:ok,
           %{
             plugin_id: plugin_id,
             current_version: current_version,
             latest_version: latest_version,
             update_available: true
           }}
        else
          {:ok, nil}
        end

      error ->
        error
    end
  end

  # Helper Functions

  defp default_marketplace_url do
    "https://plugins.raxol.io/api/v1"
  end

  defp default_cache_dir do
    Path.join(System.tmp_dir!(), "raxol_plugin_cache")
  end

  defp load_installed_plugins do
    # Mock implementation - would load from filesystem
    %{}
  end

  defp load_security_policies do
    # Load security policies for different trust levels
    %{
      trusted: PluginSandbox.trusted_policy(),
      verified: PluginSandbox.sandboxed_policy(),
      community: PluginSandbox.sandboxed_policy(),
      unverified: PluginSandbox.untrusted_policy()
    }
  end

  defp schedule_update_check do
    # Check for updates every 24 hours
    Process.send_after(self(), :check_updates, 24 * 60 * 60 * 1000)
  end

  defp apply_search_filters(results, filters) do
    results
    |> filter_by_category(filters[:category])
    |> filter_by_author(filters[:author])
    |> filter_by_rating(filters[:rating_min])
    |> filter_by_license(filters[:license])
    |> filter_by_tags(filters[:tags])
  end

  defp filter_by_category(results, nil), do: results

  defp filter_by_category(results, category) do
    Enum.filter(results, fn plugin -> plugin.category == category end)
  end

  defp filter_by_author(results, nil), do: results

  defp filter_by_author(results, author) do
    Enum.filter(results, fn plugin -> plugin.author == author end)
  end

  defp filter_by_rating(results, nil), do: results

  defp filter_by_rating(results, min_rating) do
    Enum.filter(results, fn plugin -> plugin.rating >= min_rating end)
  end

  defp filter_by_license(results, nil), do: results

  defp filter_by_license(results, license) do
    Enum.filter(results, fn plugin -> plugin.license == license end)
  end

  defp filter_by_tags(results, nil), do: results

  defp filter_by_tags(results, tags) do
    Enum.filter(results, fn plugin ->
      Enum.any?(tags, fn tag -> tag in plugin.tags end)
    end)
  end

  defp list_plugin_versions_impl(plugin_id, _state) do
    # Mock implementation - would fetch versions from marketplace
    case plugin_id do
      "terminal-themes" ->
        {:ok, ["1.0.0", "1.1.0", "2.0.0", "2.1.0"]}

      "git-integration" ->
        {:ok, ["1.0.0", "1.2.0", "1.5.0", "1.5.2"]}

      _other ->
        {:error, :plugin_not_found}
    end
  end

  defp uninstall_plugin_impl(plugin_id, state) do
    case Map.get(state.installed_plugins, plugin_id) do
      nil ->
        {:error, :plugin_not_installed}

      _install_info ->
        # Remove plugin and clean up dependencies
        Log.info("Uninstalling #{plugin_id}")

        updated_installed = Map.delete(state.installed_plugins, plugin_id)
        {:ok, %{state | installed_plugins: updated_installed}}
    end
  end

  defp update_plugin_impl(plugin_id, opts, state) do
    case Map.get(state.installed_plugins, plugin_id) do
      nil ->
        {:error, :plugin_not_installed}

      install_info ->
        # Check for updates and install if available
        case check_plugin_update(plugin_id, install_info.version, state) do
          {:ok, nil} ->
            {:error, :no_update_available}

          {:ok, update_info} ->
            install_plugin_impl(
              plugin_id,
              update_info.latest_version,
              opts,
              state
            )

          error ->
            error
        end
    end
  end

  defp add_marketplace_status(installed_plugins, _state) do
    # Add marketplace status to installed plugins
    Map.new(installed_plugins, fn {plugin_id, install_info} ->
      enhanced_info =
        Map.merge(install_info, %{
          marketplace_status: :available,
          # Would check actual status
          update_available: false,
          trust_level: :verified
        })

      {plugin_id, enhanced_info}
    end)
  end

  defp get_plugin_reviews_impl(_plugin_id, _state) do
    # Mock implementation - would fetch reviews from marketplace
    reviews = [
      %{
        rating: 5,
        title: "Excellent plugin!",
        review: "Works perfectly and easy to configure.",
        author: "user123",
        verified_purchase: true,
        created_at: ~U[2023-09-15 08:30:00Z]
      }
    ]

    {:ok, reviews}
  end

  defp submit_plugin_review_impl(_plugin_id, _rating, _review_text, _state) do
    # Mock implementation - would submit review to marketplace
    {:ok,
     %{
       status: :submitted,
       message: "Review submitted successfully"
     }}
  end
end
