defmodule ToweropsWeb.Api.V1.MaintenanceWindowsController do
  @moduledoc """
  API controller for managing maintenance windows.

  All endpoints require API token authentication and operations are scoped
  to the organization associated with the token.
  """
  use ToweropsWeb, :controller

  import ToweropsWeb.Api.ErrorHelpers, only: [translate_errors: 1]

  alias Towerops.Maintenance
  alias Towerops.Maintenance.MaintenanceWindow
  alias ToweropsWeb.ScopedResource

  @doc "GET /api/v1/maintenance_windows"
  def index(conn, params) do
    organization_id = conn.assigns.current_organization_id
    filter = Map.get(params, "filter")

    opts =
      case filter do
        "active" -> [filter: :active]
        "upcoming" -> [filter: :upcoming]
        "past" -> [filter: :past]
        _ -> []
      end

    windows =
      organization_id
      |> Maintenance.list_windows(opts)
      |> Enum.map(&format_window/1)

    json(conn, %{maintenance_windows: windows})
  end

  @doc "POST /api/v1/maintenance_windows"
  def create(conn, %{"maintenance_window" => window_params}) do
    organization_id = conn.assigns.current_organization_id
    user_id = conn.assigns.current_user.id

    attrs =
      window_params
      |> Map.put("organization_id", organization_id)
      |> Map.put("created_by_id", user_id)

    case Maintenance.create_window(attrs) do
      {:ok, window} ->
        conn
        |> put_status(:created)
        |> json(format_window(window))

      {:error, %Ecto.Changeset{} = changeset} ->
        conn
        |> put_status(:unprocessable_entity)
        |> json(%{errors: translate_errors(changeset)})
    end
  end

  def create(conn, _params) do
    conn
    |> put_status(:bad_request)
    |> json(%{error: "Missing 'maintenance_window' parameter"})
  end

  @doc "GET /api/v1/maintenance_windows/:id"
  def show(conn, %{"id" => id}) do
    organization_id = conn.assigns.current_organization_id

    case ScopedResource.fetch(MaintenanceWindow, id, organization_id) do
      {:ok, window} ->
        json(conn, format_window(window))

      {:error, :forbidden} ->
        conn
        |> put_status(:forbidden)
        |> json(%{error: "Access denied to this maintenance window"})

      {:error, :not_found} ->
        conn
        |> put_status(:not_found)
        |> json(%{error: "Maintenance window not found"})
    end
  end

  @doc "PATCH /api/v1/maintenance_windows/:id"
  def update(conn, %{"id" => id, "maintenance_window" => window_params}) do
    organization_id = conn.assigns.current_organization_id

    case ScopedResource.fetch(MaintenanceWindow, id, organization_id) do
      {:ok, window} ->
        case Maintenance.update_window(window, window_params) do
          {:ok, updated} ->
            json(conn, format_window(updated))

          {:error, %Ecto.Changeset{} = changeset} ->
            conn
            |> put_status(:unprocessable_entity)
            |> json(%{errors: translate_errors(changeset)})
        end

      {:error, :forbidden} ->
        conn
        |> put_status(:forbidden)
        |> json(%{error: "Access denied to this maintenance window"})

      {:error, :not_found} ->
        conn
        |> put_status(:not_found)
        |> json(%{error: "Maintenance window not found"})
    end
  end

  def update(conn, _params) do
    conn
    |> put_status(:bad_request)
    |> json(%{error: "Missing 'maintenance_window' parameter"})
  end

  @doc "DELETE /api/v1/maintenance_windows/:id"
  def delete(conn, %{"id" => id}) do
    organization_id = conn.assigns.current_organization_id

    case ScopedResource.fetch(MaintenanceWindow, id, organization_id) do
      {:ok, window} ->
        case Maintenance.delete_window(window) do
          {:ok, _} ->
            json(conn, %{success: true})

          {:error, %Ecto.Changeset{} = changeset} ->
            conn
            |> put_status(:unprocessable_entity)
            |> json(%{errors: translate_errors(changeset)})
        end

      {:error, :forbidden} ->
        conn
        |> put_status(:forbidden)
        |> json(%{error: "Access denied to this maintenance window"})

      {:error, :not_found} ->
        conn
        |> put_status(:not_found)
        |> json(%{error: "Maintenance window not found"})
    end
  end

  defp format_window(window) do
    %{
      id: window.id,
      name: window.name,
      reason: window.reason,
      starts_at: window.starts_at,
      ends_at: window.ends_at,
      recurring: window.recurring,
      recurrence_rule: window.recurrence_rule,
      suppress_alerts: window.suppress_alerts,
      site_id: window.site_id,
      device_id: window.device_id,
      inserted_at: window.inserted_at
    }
  end
end