elixir_dashboard

defmodule ElixirDashboardWeb.PerformanceLive.Queries do
  @moduledoc """
  Demo app wrapper - delegates to the library LiveView.
  """
  use ElixirDashboardWeb, :live_view

  alias ElixirDashboard.PerformanceMonitor.Store

  @impl true
  def mount(_params, _session, socket) do
    if connected?(socket) do
      # Refresh data every 5 seconds
      :timer.send_interval(5000, self(), :refresh)
    end

    queries = Store.get_slow_queries()
    {:ok, assign(socket, :queries, queries)}
  end

  @impl true
  def handle_info(:refresh, socket) do
    queries = Store.get_slow_queries()
    {:noreply, assign(socket, :queries, queries)}
  end

  @impl true
  def handle_event("clear", _params, socket) do
    Store.clear_all()
    {:noreply, assign(socket, :queries, [])}
  end

  @impl true
  def render(assigns) do
    ~H"""
    <div class="container mx-auto p-6">
      <div class="mb-6">
        <h1 class="text-3xl font-bold text-gray-900 mb-2">Slow SQL Queries</h1>
        <p class="text-sm text-gray-600 mb-4">
          Showing the 100 slowest queries recorded since the server started (threshold: 50ms).
        </p>
        <button
          phx-click="clear"
          class="px-4 py-2 bg-red-600 text-white rounded hover:bg-red-700 transition"
        >
          Clear Data
        </button>
      </div>

      <div :if={length(@queries) == 0} class="bg-blue-50 border border-blue-200 rounded-lg p-4">
        <p class="text-blue-800">
          No slow queries recorded yet. Start making database requests to see data.
        </p>
      </div>

      <div :if={length(@queries) > 0} class="space-y-4">
        <div
          :for={query <- @queries}
          class="bg-white shadow-md rounded-lg overflow-hidden hover:shadow-lg transition"
        >
          <div class="p-5">
            <div class="flex justify-between items-baseline mb-3">
              <span class={[
                "text-xl font-bold",
                duration_color(query.duration_ms)
              ]}>
                <%= query.duration_ms %>ms
              </span>
              <span class="text-sm text-gray-500">
                <%= format_timestamp(query.timestamp) %>
              </span>
            </div>

            <div class="mb-3">
              <p class="text-sm text-gray-600">
                <span class="font-semibold">Endpoint:</span>
                <span class="font-mono ml-2 text-gray-800"><%= query.endpoint_path %></span>
              </p>
            </div>

            <div class="bg-gray-50 rounded-md p-3 border border-gray-200">
              <p class="text-xs text-gray-500 mb-1 font-semibold">SQL Query:</p>
              <pre class="text-sm overflow-x-auto whitespace-pre-wrap break-words font-mono text-gray-800"><code><%= query.query %></code></pre>
            </div>

            <div
              :if={query.params && length(query.params) > 0}
              class="mt-3 bg-blue-50 rounded-md p-3 border border-blue-200"
            >
              <p class="text-xs text-blue-700 mb-1 font-semibold">Parameters:</p>
              <pre class="text-sm overflow-x-auto whitespace-pre-wrap break-words font-mono text-blue-900"><code><%= inspect(query.params, pretty: true) %></code></pre>
            </div>
          </div>
        </div>
      </div>
    </div>
    """
  end

  defp format_timestamp(milli) do
    milli
    |> DateTime.from_unix!(:millisecond)
    |> Calendar.strftime("%Y-%m-%d %H:%M:%S")
  end

  defp duration_color(ms) when ms > 500, do: "text-red-600"
  defp duration_color(ms) when ms > 200, do: "text-orange-600"
  defp duration_color(ms) when ms > 100, do: "text-yellow-600"
  defp duration_color(_), do: "text-green-600"
end