defmodule ToweropsWeb.Api.V1.SitesController do
  @moduledoc """
  API controller for managing sites.

  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.Sites
  alias Towerops.Sites.Site
  alias ToweropsWeb.ScopedResource

  @doc """
  GET /api/v1/sites

  Lists all sites for the authenticated organization.

  Response:
  {
    "sites": [
      {
        "id": "uuid",
        "name": "Main Office",
        "location": "New York, NY",
        "snmp_community": "public",
        "inserted_at": "2026-01-15T19:44:25Z"
      }
    ]
  }
  """
  def index(conn, _params) do
    organization_id = conn.assigns.current_organization_id

    sites =
      organization_id
      |> Sites.list_organization_sites()
      |> Enum.map(&format_site/1)

    json(conn, %{sites: sites})
  end

  @doc """
  POST /api/v1/sites

  Creates a new site for the authenticated organization.
  """
  def create(conn, %{"site" => site_params}) do
    organization_id = conn.assigns.current_organization_id
    attrs = Map.put(site_params, "organization_id", organization_id)

    case Sites.create_site(attrs) do
      {:ok, site} ->
        conn
        |> put_status(:created)
        |> json(format_site(site))

      {: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 'site' parameter"})
  end

  @doc """
  GET /api/v1/sites/:id

  Gets a single site by ID.
  """
  def show(conn, %{"id" => id}) do
    organization_id = conn.assigns.current_organization_id

    case ScopedResource.fetch(Site, id, organization_id) do
      {:ok, site} ->
        json(conn, format_site(site))

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

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

  @doc """
  PATCH /api/v1/sites/:id

  Updates a site.
  """
  def update(conn, %{"id" => id, "site" => site_params}) do
    organization_id = conn.assigns.current_organization_id

    case ScopedResource.fetch(Site, id, organization_id) do
      {:ok, site} ->
        case Sites.update_site(site, site_params) do
          {:ok, updated_site} ->
            json(conn, format_site(updated_site))

          {: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 site"})

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

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

  @doc """
  DELETE /api/v1/sites/:id

  Deletes a site.
  """
  def delete(conn, %{"id" => id}) do
    organization_id = conn.assigns.current_organization_id

    case ScopedResource.fetch(Site, id, organization_id) do
      {:ok, site} ->
        case Sites.delete_site(site) do
          {:ok, _site} ->
            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 site"})

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

  defp format_site(site) do
    %{
      id: site.id,
      name: site.name,
      description: site.description,
      location: site.location,
      address: site.address,
      latitude: site.latitude,
      longitude: site.longitude,
      display_order: site.display_order,
      snmp_community: site.snmp_community,
      snmp_version: site.snmp_version,
      snmp_port: site.snmp_port,
      snmp_transport: site.snmp_transport,
      agent_token_id: site.agent_token_id,
      parent_site_id: site.parent_site_id,
      inserted_at: site.inserted_at
    }
  end
end