defmodule MicrowavepropWeb.UserManagementLive.Edit do
  @moduledoc "Admin edit page for a single user (roles, suspension, monitors)."
  use MicrowavepropWeb, :live_view

  alias Microwaveprop.Accounts
  alias Microwaveprop.BeaconMonitors

  @impl true
  def render(assigns) do
    ~H"""
    <Layouts.app flash={@flash} current_scope={@current_scope}>
      <.header>
        Edit user
        <:subtitle>{@user.callsign} &middot; {@user.email}</:subtitle>
      </.header>

      <.form for={@form} id="user-form" phx-change="validate" phx-submit="save">
        <.input field={@form[:callsign]} type="text" label="Callsign" required />
        <.input field={@form[:name]} type="text" label="Name" required />
        <.input field={@form[:email]} type="email" label="Email" required />
        <label class="flex items-center gap-2 cursor-pointer mt-4">
          <.input field={@form[:is_admin]} type="checkbox" label="Admin" />
        </label>
        <footer class="mt-4 flex gap-2">
          <.button variant="primary" phx-disable-with="Saving...">Save</.button>
          <.button navigate={~p"/users"}>Cancel</.button>
        </footer>
      </.form>

      <div class="card bg-base-200 shadow-sm mt-8">
        <div class="card-body">
          <h2 class="card-title text-sm">Beacon monitors</h2>
          <p class="text-xs opacity-70 mb-3">
            Monitor hardware assigned to this user.
          </p>

          <%= if @monitors == [] do %>
            <p class="text-sm opacity-70 mb-4">No monitors assigned to this user.</p>
          <% else %>
            <div class="overflow-x-auto mb-4">
              <table class="table table-zebra table-sm">
                <thead>
                  <tr>
                    <th>Name</th>
                    <th>Hardware</th>
                    <th>Last seen</th>
                    <th class="w-1"></th>
                  </tr>
                </thead>
                <tbody>
                  <tr :for={monitor <- @monitors}>
                    <td>
                      <.link
                        navigate={~p"/admin/beacon-monitors/#{monitor.id}"}
                        class="link link-hover font-semibold"
                      >
                        {monitor.name}
                      </.link>
                    </td>
                    <td class="text-sm">
                      {monitor.hardware_type}
                      <span :if={monitor.hardware_id} class="opacity-60 text-xs">
                        ({monitor.hardware_id})
                      </span>
                    </td>
                    <td class="text-sm opacity-70">
                      <%= if monitor.last_seen_at do %>
                        {Calendar.strftime(monitor.last_seen_at, "%Y-%m-%d %H:%M UTC")}
                      <% else %>
                        never
                      <% end %>
                    </td>
                    <td>
                      <.link
                        phx-click={JS.push("unassign-monitor", value: %{id: monitor.id})}
                        data-confirm={"Remove monitor '#{monitor.name}' from #{@user.callsign}?"}
                        class="btn btn-xs btn-ghost text-error"
                      >
                        Remove
                      </.link>
                    </td>
                  </tr>
                </tbody>
              </table>
            </div>
          <% end %>
        </div>
      </div>
    </Layouts.app>
    """
  end

  @impl true
  def mount(%{"id" => id}, _session, socket) do
    case Accounts.get_user!(id) do
      nil ->
        {:ok,
         socket
         |> put_flash(:error, "User not found.")
         |> push_navigate(to: ~p"/users")}

      user ->
        monitors = BeaconMonitors.list_monitors_for_user(user)

        {:ok,
         socket
         |> assign(:page_title, "Edit user")
         |> assign(:user, user)
         |> assign(:monitors, monitors)
         |> assign(:form, to_form(Accounts.change_admin_user(user)))}
    end
  end

  @impl true
  def handle_event("validate", %{"user" => params}, socket) do
    changeset = Accounts.change_admin_user(socket.assigns.user, params)
    {:noreply, assign(socket, form: to_form(changeset, action: :validate))}
  end

  @impl true
  def handle_event("save", %{"user" => params}, socket) do
    case Accounts.admin_update_user(socket.assigns.user, params) do
      {:ok, _user} ->
        {:noreply,
         socket
         |> put_flash(:info, "User updated")
         |> push_navigate(to: ~p"/users")}

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

  @impl true
  def handle_event("unassign-monitor", %{"id" => monitor_id}, socket) do
    user = socket.assigns.user

    case BeaconMonitors.delete_monitor!(monitor_id) do
      {:ok, monitor} ->
        monitors = BeaconMonitors.list_monitors_for_user(user)

        {:noreply,
         socket
         |> assign(:monitors, monitors)
         |> put_flash(:info, "Monitor '#{monitor.name}' removed from #{user.callsign}.")}

      {:error, :not_found} ->
        {:noreply, put_flash(socket, :error, "Monitor not found.")}
    end
  end
end