defmodule MicrowavepropWeb.RoverLocationsLive do
  @moduledoc """
  Globally-shared list of rover-friendly (or off-limits) parking
  locations. Everyone sees the list; only logged-in users can add or
  edit entries (and only the creator can edit/delete their own).
  """
  use MicrowavepropWeb, :live_view

  alias Microwaveprop.Accounts.User
  alias Microwaveprop.Radio.Maidenhead
  alias Microwaveprop.Rover
  alias Microwaveprop.Rover.Location

  @impl true
  def mount(_params, _session, socket) do
    {:ok,
     assign(socket,
       page_title: "Rover Locations",
       locations: Rover.list_locations(),
       form: nil,
       editing_id: nil,
       expanded_id: nil
     )}
  end

  @impl true
  def handle_event("toggle_map", %{"id" => id}, socket) do
    new_id = if socket.assigns.expanded_id == id, do: nil, else: id
    {:noreply, assign(socket, expanded_id: new_id)}
  end

  def handle_event("new", _params, socket) do
    if user = current_user(socket) do
      form = blank_form(user)
      {:noreply, assign(socket, form: form, editing_id: nil)}
    else
      {:noreply, put_flash(socket, :error, "Sign in to add a location.")}
    end
  end

  def handle_event("edit", %{"id" => id}, socket) do
    case current_user(socket) do
      %User{id: user_id} ->
        case Enum.find(socket.assigns.locations, &(&1.id == id)) do
          %Location{user_id: ^user_id} = loc ->
            cs = Location.changeset(loc, %{})
            {:noreply, assign(socket, form: to_form(cs), editing_id: id)}

          _ ->
            {:noreply, put_flash(socket, :error, "You can only edit your own locations.")}
        end

      _ ->
        {:noreply, put_flash(socket, :error, "Sign in to edit a location.")}
    end
  end

  def handle_event("cancel", _, socket) do
    {:noreply, assign(socket, form: nil, editing_id: nil)}
  end

  def handle_event("validate", %{"location" => params}, socket) do
    base = if socket.assigns.editing_id, do: location_for_edit(socket), else: %Location{}
    cs = base |> Location.changeset(params) |> Map.put(:action, :validate)
    {:noreply, assign(socket, form: to_form(cs))}
  end

  def handle_event("save", %{"location" => params}, socket) do
    user = current_user(socket)

    cond do
      is_nil(user) ->
        {:noreply, put_flash(socket, :error, "Sign in required.")}

      socket.assigns.editing_id ->
        save_update(socket, user, params)

      true ->
        save_create(socket, user, params)
    end
  end

  def handle_event("delete", %{"id" => id}, socket) do
    case current_user(socket) do
      %User{} = user ->
        case Rover.delete_location(user, id) do
          {:ok, _} ->
            {:noreply,
             socket
             |> assign(locations: Rover.list_locations())
             |> put_flash(:info, "Location removed.")}

          {:error, :not_found} ->
            {:noreply, put_flash(socket, :error, "You can only delete your own locations.")}
        end

      _ ->
        {:noreply, put_flash(socket, :error, "Sign in required.")}
    end
  end

  defp save_create(socket, user, params) do
    case Rover.create_location(user, params) do
      {:ok, _loc} ->
        {:noreply,
         socket
         |> assign(form: nil, editing_id: nil, locations: Rover.list_locations())
         |> put_flash(:info, "Location added.")}

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

  defp save_update(socket, user, params) do
    case Rover.update_location(user, socket.assigns.editing_id, params) do
      {:ok, _loc} ->
        {:noreply,
         socket
         |> assign(form: nil, editing_id: nil, locations: Rover.list_locations())
         |> put_flash(:info, "Location updated.")}

      {:error, :not_found} ->
        {:noreply, put_flash(socket, :error, "You can only edit your own locations.")}

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

  defp location_for_edit(socket) do
    Enum.find(socket.assigns.locations, &(&1.id == socket.assigns.editing_id)) || %Location{}
  end

  defp blank_form(_user) do
    %Location{} |> Location.changeset(%{}) |> to_form()
  end

  defp current_user(%Phoenix.LiveView.Socket{assigns: assigns}), do: scope_user(assigns)
  defp current_user(assigns) when is_map(assigns), do: scope_user(assigns)

  defp scope_user(assigns) do
    case assigns[:current_scope] do
      %{user: %User{} = user} -> user
      _ -> nil
    end
  end

  defp can_edit?(_assigns, %Location{user_id: nil}), do: false

  defp can_edit?(assigns, %Location{user_id: uid}) do
    case current_user(assigns) do
      %User{id: ^uid} -> true
      _ -> false
    end
  end

  defp status_label(:ideal), do: "Ideal"
  defp status_label(:off_limits), do: "Off Limits"

  defp status_class(:ideal), do: "badge badge-success"
  defp status_class(:off_limits), do: "badge badge-error"

  @impl true
  def render(assigns) do
    ~H"""
    <Layouts.app flash={@flash} current_scope={@current_scope}>
      <div class="max-w-5xl mx-auto px-4 py-6">
        <div class="flex items-center justify-between mb-4">
          <div>
            <h1 class="text-2xl font-semibold">Rover Locations</h1>
            <p class="text-sm text-base-content/60">
              Community-shared parking spots for portable rover ops.
            </p>
          </div>
          <button
            type="button"
            phx-click="new"
            class="btn btn-primary btn-sm"
            disabled={is_nil(current_user(assigns))}
          >
            + Add location
          </button>
        </div>

        <p :if={is_nil(current_user(assigns))} class="alert alert-info text-sm mb-4">
          <a href={~p"/users/log-in"} class="link link-primary">Sign in</a> to add or edit locations.
        </p>

        <div :if={@form} class="card bg-base-200 p-4 mb-4">
          <h2 class="text-lg font-semibold mb-2">
            {if @editing_id, do: "Edit location", else: "New location"}
          </h2>
          <.form for={@form} phx-change="validate" phx-submit="save" id="location-form">
            <div class="grid grid-cols-1 md:grid-cols-3 gap-3">
              <.input
                field={@form[:lat]}
                type="number"
                step="any"
                label="Latitude"
                placeholder="32.5"
              />
              <.input
                field={@form[:lon]}
                type="number"
                step="any"
                label="Longitude"
                placeholder="-97.5"
              />
              <.input
                field={@form[:status]}
                type="select"
                label="Status"
                options={[{"Ideal", :ideal}, {"Off Limits", :off_limits}]}
              />
            </div>
            <.input
              field={@form[:notes]}
              type="textarea"
              label="Notes"
              rows="3"
              placeholder="Trail access, line-of-sight notes, contact info, etc."
            />
            <div class="flex gap-2 mt-3">
              <button type="submit" class="btn btn-primary btn-sm">
                {if @editing_id, do: "Save", else: "Add"}
              </button>
              <button type="button" phx-click="cancel" class="btn btn-ghost btn-sm">
                Cancel
              </button>
            </div>
          </.form>
        </div>

        <div :if={@locations == []} class="text-base-content/60 text-sm py-8 text-center">
          No locations yet. Be the first to share one.
        </div>

        <ul :if={@locations != []} class="space-y-3">
          <li
            :for={loc <- @locations}
            id={"location-#{loc.id}"}
            class="card bg-base-100 border border-base-300 p-4"
          >
            <div class="flex items-start justify-between gap-3">
              <div
                class="flex-1 min-w-0 cursor-pointer"
                phx-click="toggle_map"
                phx-value-id={loc.id}
              >
                <div class="flex items-center gap-2 mb-1 flex-wrap">
                  <span class={status_class(loc.status)}>{status_label(loc.status)}</span>
                  <span class="font-mono text-sm font-semibold">
                    {Maidenhead.from_latlon(loc.lat, loc.lon, 10)}
                  </span>
                  <span class="font-mono text-xs text-base-content/60">
                    {Float.round(loc.lat, 5)}, {Float.round(loc.lon, 5)}
                  </span>
                </div>
                <p :if={loc.notes && loc.notes != ""} class="text-sm whitespace-pre-line">
                  {loc.notes}
                </p>
                <p class="text-xs text-base-content/50 mt-1">
                  Added {Calendar.strftime(loc.inserted_at, "%Y-%m-%d")}
                </p>
              </div>
              <div :if={can_edit?(assigns, loc)} class="flex gap-2 shrink-0">
                <button
                  type="button"
                  phx-click="edit"
                  phx-value-id={loc.id}
                  class="btn btn-ghost btn-xs"
                >
                  Edit
                </button>
                <button
                  type="button"
                  phx-click="delete"
                  phx-value-id={loc.id}
                  data-confirm="Delete this location?"
                  class="btn btn-ghost btn-xs text-error"
                >
                  Delete
                </button>
              </div>
            </div>
            <div
              :if={@expanded_id == loc.id}
              id={"location-map-#{loc.id}"}
              phx-hook="LocationMap"
              phx-update="ignore"
              data-lat={loc.lat}
              data-lon={loc.lon}
              class="mt-3 h-80 rounded border border-base-300 z-0"
            >
            </div>
          </li>
        </ul>
      </div>
    </Layouts.app>
    """
  end
end