defmodule MvWeb.Components.ViewSettingsDropdownComponent do
  @moduledoc """
  LiveComponent for the member-overview view settings (§1.20).

  Renders an icon button with a tooltip that opens a dropdown of toggles:

    * Compact mode — table row density (compact ↔ comfortable)
    * Compact Member field — composite last+first name cell, with a sub-toggle
      "include email"
    * Compact address field — composite street / postal+city cell

  Turning a composite field off surfaces the underlying separate columns in the
  table. The component is display-only: it emits `{:view_setting_toggled, key}`
  to the parent LiveView, which owns and persists the settings.

  ## Props
    - `:density` — `:compact` or `:comfortable`
    - `:compact_member` — boolean
    - `:member_include_email` — boolean
    - `:compact_address` — boolean
    - `:id` — component id
  """

  use MvWeb, :live_component

  @impl true
  def update(assigns, socket) do
    {:ok,
     socket
     |> assign(assigns)
     |> assign_new(:open, fn -> false end)}
  end

  @impl true
  def render(assigns) do
    ~H"""
    <div>
      <.dropdown_menu
        id="view-settings-menu"
        icon="hero-cog-6-tooth"
        button_label={gettext("View")}
        open={@open}
        phx_target={@myself}
        menu_width="w-72"
        testid="view-settings"
        button_testid="view-settings-button"
      >
        <li role="none" class="mb-1 px-2">
          <span class="font-semibold">{gettext("View settings")}</span>
        </li>

        <.toggle_item
          setting="density"
          label={gettext("Compact mode")}
          checked={@density == :compact}
          target={@myself}
        />

        <.toggle_item
          setting="compact_member"
          label={gettext("Compact Member field")}
          checked={@compact_member}
          target={@myself}
        />

        <%!-- The email line lives inside the composite Member cell, so this
        sub-toggle is only meaningful while that cell is compact. When the
        composite is off, email is its own column and this toggle is omitted. --%>
        <li :if={@compact_member} role="none" class="pl-6">
          <.toggle_item
            setting="member_include_email"
            label={gettext("include email")}
            checked={@member_include_email}
            target={@myself}
          />
        </li>

        <.toggle_item
          setting="compact_address"
          label={gettext("Compact address field")}
          checked={@compact_address}
          target={@myself}
        />
      </.dropdown_menu>
    </div>
    """
  end

  attr :setting, :string, required: true
  attr :label, :string, required: true
  attr :checked, :boolean, required: true
  attr :target, :any, required: true

  defp toggle_item(assigns) do
    ~H"""
    <button
      type="button"
      role="menuitemcheckbox"
      aria-checked={to_string(@checked)}
      aria-label={@label}
      tabindex="0"
      class="flex items-center gap-2 px-2 py-1 rounded w-full text-left cursor-pointer hover:bg-base-200"
      phx-click="toggle"
      phx-value-setting={@setting}
      phx-target={@target}
      data-testid={"view-setting-#{String.replace(@setting, "_", "-")}"}
    >
      <span class={if @checked, do: "text-primary", else: "text-base-300"} aria-hidden="true">
        <.icon name="hero-check" class="size-4 shrink-0" />
      </span>
      <span>{@label}</span>
    </button>
    """
  end

  @impl true
  def handle_event("toggle_dropdown", _params, socket) do
    {:noreply, assign(socket, :open, !socket.assigns.open)}
  end

  def handle_event("close_dropdown", _params, socket) do
    {:noreply, assign(socket, :open, false)}
  end

  def handle_event("toggle", %{"setting" => setting}, socket) do
    send(self(), {:view_setting_toggled, String.to_existing_atom(setting)})
    {:noreply, socket}
  end
end