defmodule ToweropsWeb.Admin.OrgLive.Index do
  @moduledoc """
  Admin interface for viewing and managing organizations.
  """
  use ToweropsWeb, :live_view

  alias Towerops.Admin
  alias Towerops.Billing
  alias Towerops.Organizations.Organization

  on_mount {ToweropsWeb.UserAuth, :require_superuser}

  @impl true
  def mount(_params, _session, socket) do
    orgs = Admin.list_all_organizations()
    default_free_devices = Billing.default_free_devices()
    default_price = Billing.default_price_per_device()
    active_sub_count = Admin.count_active_subscriptions()

    ip =
      case get_connect_info(socket, :peer_data) do
        %{address: address} -> to_string(:inet_parse.ntoa(address))
        _ -> "unknown"
      end

    {:ok,
     socket
     |> assign(:page_title, t("All Organizations"))
     |> assign(:timezone, socket.assigns.current_scope.timezone)
     |> assign(:organizations, orgs)
     |> assign(:client_ip, ip)
     |> assign(:editing_org, nil)
     |> assign(:override_form, nil)
     |> assign(:default_free_devices, default_free_devices)
     |> assign(:default_price, default_price)
     |> assign(:active_sub_count, active_sub_count)
     |> assign(:editing_global, false)
     |> assign(:global_form, nil)
     |> assign(:show_confirm, false)
     |> assign(:pending_pricing_params, nil)}
  end

  @impl true
  def handle_params(%{"edit_global" => "true"} = _params, _url, socket) do
    form =
      to_form(%{
        "default_free_devices" => socket.assigns.default_free_devices,
        "default_price_per_device" => Decimal.to_string(socket.assigns.default_price)
      })

    {:noreply,
     socket
     |> assign(:editing_global, true)
     |> assign(:global_form, form)
     |> assign(:show_confirm, false)
     |> assign(:editing_org, nil)
     |> assign(:override_form, nil)}
  end

  def handle_params(params, _url, socket) do
    case params["edit"] do
      nil ->
        {:noreply,
         socket
         |> assign(:editing_org, nil)
         |> assign(:override_form, nil)
         |> assign(:editing_global, false)}

      org_id ->
        org = Enum.find(socket.assigns.organizations, &(&1.id == org_id))

        if org do
          changeset = Organization.billing_override_changeset(org, %{})

          {:noreply,
           socket
           |> assign(:editing_org, org)
           |> assign(:override_form, to_form(changeset))
           |> assign(:editing_global, false)}
        else
          {:noreply,
           socket
           |> assign(:editing_org, nil)
           |> assign(:override_form, nil)
           |> assign(:editing_global, false)}
        end
    end
  end

  @impl true
  def handle_event("edit_overrides", %{"id" => org_id}, socket) do
    {:noreply, push_patch(socket, to: ~p"/admin/organizations?edit=#{org_id}")}
  end

  def handle_event("validate_overrides", %{"organization" => params}, socket) do
    changeset =
      socket.assigns.editing_org
      |> Organization.billing_override_changeset(params)
      |> Map.put(:action, :validate)

    {:noreply, assign(socket, :override_form, to_form(changeset))}
  end

  def handle_event("save_overrides", %{"organization" => params}, socket) do
    superuser = socket.assigns.current_scope.superuser || socket.assigns.current_scope.user
    org = socket.assigns.editing_org

    case Admin.update_billing_overrides(org.id, params, superuser.id, socket.assigns.client_ip) do
      {:ok, _updated_org} ->
        orgs = Admin.list_all_organizations()

        {:noreply,
         socket
         |> put_flash(:info, t_admin("Billing overrides updated"))
         |> assign(:organizations, orgs)
         |> push_patch(to: ~p"/admin/organizations")}

      {:error, changeset} ->
        {:noreply, assign(socket, :override_form, to_form(changeset))}
    end
  end

  def handle_event("clear_overrides", _params, socket) do
    superuser = socket.assigns.current_scope.superuser || socket.assigns.current_scope.user
    org = socket.assigns.editing_org

    attrs = %{custom_free_device_limit: nil, custom_price_per_device: nil}

    case Admin.update_billing_overrides(org.id, attrs, superuser.id, socket.assigns.client_ip) do
      {:ok, _updated_org} ->
        orgs = Admin.list_all_organizations()

        {:noreply,
         socket
         |> put_flash(:info, t_admin("Billing overrides cleared"))
         |> assign(:organizations, orgs)
         |> push_patch(to: ~p"/admin/organizations")}

      {:error, _changeset} ->
        {:noreply, put_flash(socket, :error, t_admin("Failed to clear overrides"))}
    end
  end

  def handle_event("cancel_overrides", _params, socket) do
    {:noreply, push_patch(socket, to: ~p"/admin/organizations")}
  end

  def handle_event("delete_org", %{"id" => org_id}, socket) do
    superuser = socket.assigns.current_scope.superuser || socket.assigns.current_scope.user
    ip = socket.assigns.client_ip

    case Admin.delete_organization(org_id, superuser.id, ip) do
      {:ok, _} ->
        {:noreply,
         socket
         |> put_flash(:info, t_admin("Organization deleted successfully"))
         |> assign(:organizations, Admin.list_all_organizations())}

      {:error, _} ->
        {:noreply, put_flash(socket, :error, t_admin("Failed to delete organization"))}
    end
  end

  def handle_event("edit_global_defaults", _params, socket) do
    {:noreply, push_patch(socket, to: ~p"/admin/organizations?edit_global=true")}
  end

  def handle_event("validate_global_pricing", %{"global_pricing" => params}, socket) do
    errors = validate_global_pricing_params(params)
    form = to_form(params, errors: errors)

    {:noreply, assign(socket, :global_form, form)}
  end

  def handle_event("save_global_pricing", %{"global_pricing" => params}, socket) do
    case validate_global_pricing_params(params) do
      [] ->
        # Valid - show confirmation
        {:noreply,
         socket
         |> assign(:show_confirm, true)
         |> assign(:pending_pricing_params, params)}

      errors ->
        form = to_form(params, errors: errors)
        {:noreply, assign(socket, :global_form, form)}
    end
  end

  def handle_event("confirm_pricing_update", _params, socket) do
    params = socket.assigns.pending_pricing_params
    superuser = socket.assigns.current_scope.superuser || socket.assigns.current_scope.user

    case Admin.update_global_pricing(params, superuser.id, socket.assigns.client_ip) do
      {:ok, result} ->
        {:noreply,
         socket
         |> put_flash(
           :info,
           "Pricing updated successfully. #{result.succeeded}/#{result.total} subscriptions migrated."
         )
         |> push_patch(to: ~p"/admin/organizations")}

      {:error, reason} ->
        {:noreply, put_flash(socket, :error, "Failed to update pricing: #{inspect(reason)}")}
    end
  end

  def handle_event("cancel_global_edit", _params, socket) do
    {:noreply, push_patch(socket, to: ~p"/admin/organizations")}
  end

  defp validate_global_pricing_params(params) do
    []
    |> validate_free_devices(params)
    |> validate_price_per_device(params)
  end

  defp validate_free_devices(errors, params) do
    case Map.get(params, "default_free_devices") do
      nil -> errors
      value -> validate_free_devices_value(errors, value)
    end
  end

  defp validate_free_devices_value(errors, value) do
    case Integer.parse(value) do
      {int, _} when int > 0 and int < 10_000 ->
        errors

      _ ->
        [{:default_free_devices, {"must be greater than 0 and less than 10,000", []}} | errors]
    end
  end

  defp validate_price_per_device(errors, params) do
    case Map.get(params, "default_price_per_device") do
      nil -> errors
      value -> validate_price_per_device_value(errors, value)
    end
  end

  defp validate_price_per_device_value(errors, value) do
    case Decimal.parse(value) do
      {decimal, _} -> validate_price_range(errors, decimal)
      :error -> [{:default_price_per_device, {"must be a valid decimal", []}} | errors]
    end
  end

  defp validate_price_range(errors, decimal) do
    valid_range? =
      Decimal.compare(decimal, "0.01") in [:gt, :eq] and
        Decimal.compare(decimal, "999.99") in [:lt, :eq]

    if valid_range? do
      errors
    else
      [{:default_price_per_device, {"must be between 0.01 and 999.99", []}} | errors]
    end
  end
end