defmodule MvWeb.Layouts.Sidebar do
  @moduledoc """
  Sidebar navigation component used in the drawer layout
  """
  use MvWeb, :html

  attr :current_user, :map, default: nil, doc: "The current user"
  attr :club_name, :string, required: true, doc: "The name of the club"
  attr :mobile, :boolean, default: false, doc: "Whether this is mobile view"

  def sidebar(assigns) do
    ~H"""
    <label for="mobile-drawer" aria-label={gettext("Close sidebar")} class="drawer-overlay lg:hidden focus:outline-none focus:ring-2 focus:ring-primary" tabindex="-1">
    </label>
    <aside id="main-sidebar" class="sidebar" aria-label={gettext("Main navigation")}>
      <%= sidebar_header(assigns) %>
      <%= if @current_user do %>
        <%= sidebar_menu(assigns) %>
      <% end %>
      <%= if @current_user do %>
        <.sidebar_footer current_user={@current_user} />
      <% end %>
    </aside>
    """
  end

  defp sidebar_header(assigns) do
    ~H"""
    <div class="flex items-center gap-3 p-4 border-b border-base-300">
      <!-- Logo -->
      <img src={~p"/images/mila.svg"} alt="Mila Logo" class="size-8 shrink-0" />

      <!-- Club Name -->
      <span class="menu-label text-lg font-bold truncate">
        {@club_name}
      </span>

      <!-- Toggle Button (Desktop only) -->
      <%= unless @mobile do %>
        <button
          type="button"
          id="sidebar-toggle"
          class="hidden lg:flex ml-auto btn btn-ghost btn-sm btn-square"
          aria-label={gettext("Toggle sidebar")}
          aria-expanded="true"
          onclick="toggleSidebar()"
        >
          <!-- Expanded Icon (Chevron Left) -->
          <.icon
            name="hero-chevron-left"
            class="size-5 sidebar-expanded-icon"
            aria-hidden="true"
          />
          <!-- Collapsed Icon (Chevron Right) -->
          <.icon
            name="hero-chevron-right"
            class="size-5 sidebar-collapsed-icon"
            aria-hidden="true"
          />
        </button>
      <% end %>
    </div>
    """
  end

  defp sidebar_menu(assigns) do
    ~H"""
    <ul class="menu flex-1 w-full p-2" role="menubar">
      <.menu_item
        href={~p"/members"}
        icon="hero-users"
        label={gettext("Members")}
      />
      <.menu_item
        href={~p"/users"}
        icon="hero-user-circle"
        label={gettext("Users")}
      />
      <.menu_item
        href={~p"/custom_fields"}
        icon="hero-rectangle-group"
        label={gettext("Custom Fields")}
      />

      <!-- Nested Menu: Contributions -->
      <.menu_group
        icon="hero-currency-dollar"
        label={gettext("Contributions")}
      >
        <.menu_subitem href="/contribution_types" label={gettext("Contribution Types")} />
        <.menu_subitem href="/contribution_settings" label={gettext("Settings")} />
      </.menu_group>

      <.menu_item
        href="#"
        icon="hero-cog-6-tooth"
        label={gettext("Settings")}
      />
    </ul>
    """
  end

  attr :href, :string, required: true, doc: "Navigation path"
  attr :icon, :string, required: true, doc: "Heroicon name"
  attr :label, :string, required: true, doc: "Menu item label"

  defp menu_item(assigns) do
    ~H"""
    <li role="none">
      <.link
        navigate={@href}
        class="flex items-center gap-3 tooltip tooltip-right focus:outline-none focus:ring-2 focus:ring-primary focus:ring-offset-2"
        data-tip={@label}
        role="menuitem"
      >
        <.icon name={@icon} class="size-5 shrink-0" aria-hidden="true" />
        <span class="menu-label">{@label}</span>
      </.link>
    </li>
    """
  end

  attr :icon, :string, required: true, doc: "Heroicon name for the menu group"
  attr :label, :string, required: true, doc: "Menu group label"
  slot :inner_block, required: true, doc: "Submenu items"

  defp menu_group(assigns) do
    ~H"""
    <li role="none" class="menu-group">
      <!-- Expanded Mode: Details/Summary -->
      <details class="expanded-menu-group">
        <summary class="flex items-center gap-3 cursor-pointer focus:outline-none focus:ring-2 focus:ring-primary focus:ring-offset-2" role="menuitem" aria-haspopup="true">
          <.icon name={@icon} class="size-5 shrink-0" aria-hidden="true" />
          <span class="menu-label">{@label}</span>
        </summary>
        <ul role="menu" class="ml-4">
          {render_slot(@inner_block)}
        </ul>
      </details>

      <!-- Collapsed Mode: Dropdown -->
      <div class="collapsed-menu-group dropdown dropdown-right">
        <button
          type="button"
          tabindex="0"
          class="flex items-center justify-center w-full p-2 rounded-lg hover:bg-base-300 tooltip tooltip-right focus:outline-none focus:ring-2 focus:ring-primary focus:ring-offset-2"
          data-tip={@label}
          aria-haspopup="menu"
          aria-label={@label}
        >
          <.icon name={@icon} class="size-5" aria-hidden="true" />
        </button>
        <ul
          tabindex="0"
          class="dropdown-content menu bg-base-100 rounded-box shadow-lg z-50 min-w-48 p-2 focus:outline-none"
          role="menu"
        >
          <li class="menu-title">{@label}</li>
          {render_slot(@inner_block)}
        </ul>
      </div>
    </li>
    """
  end

  attr :href, :string, required: true, doc: "Navigation path for submenu item"
  attr :label, :string, required: true, doc: "Submenu item label"

  defp menu_subitem(assigns) do
    ~H"""
    <li role="none">
      <.link navigate={@href} role="menuitem" class="focus:outline-none focus:ring-2 focus:ring-primary focus:ring-offset-2">
        {@label}
      </.link>
    </li>
    """
  end

  attr :current_user, :map, default: nil, doc: "The current user"

  defp sidebar_footer(assigns) do
    ~H"""
    <div class="mt-auto p-4 border-t border-base-300 space-y-4">
      <!-- Language Selector (nur expanded) -->
      <form method="post" action={~p"/set_locale"} class="expanded-only">
        <input type="hidden" name="_csrf_token" value={get_csrf_token()} />
        <select
          name="locale"
          onchange="this.form.submit()"
          class="select select-sm w-full focus:outline-none focus:ring-2 focus:ring-primary focus:ring-offset-2"
          aria-label={gettext("Select language")}
        >
          <option value="de" selected={Gettext.get_locale() == "de"}>Deutsch</option>
          <option value="en" selected={Gettext.get_locale() == "en"}>English</option>
        </select>
      </form>

      <!-- Theme Toggle (immer sichtbar) -->
      <.theme_toggle />

      <!-- User Menu (nur wenn current_user existiert) -->
      <%= if @current_user do %>
        <.user_menu current_user={@current_user} />
      <% end %>
    </div>
    """
  end

  defp theme_toggle(assigns) do
    ~H"""
    <label class="flex items-center gap-2 cursor-pointer justify-center focus-within:outline-none focus-within:ring-2 focus-within:ring-primary focus-within:ring-offset-2" aria-label={gettext("Toggle dark mode")}>
      <.icon name="hero-sun" class="size-5" aria-hidden="true" />
      <input
        type="checkbox"
        value="dark"
        class="toggle toggle-sm theme-controller focus:outline-none"
        aria-label={gettext("Toggle dark mode")}
      />
      <.icon name="hero-moon" class="size-5" aria-hidden="true" />
    </label>
    """
  end

  attr :current_user, :map, default: nil, doc: "The current user"

  defp user_menu(assigns) do
    # Defensive check: ensure current_user and email exist
    # current_user might be a struct, so we need to handle both maps and structs
    # email might be an Ash.CiString, so we use to_string/1 (not String.to_string/1)
    email = case assigns.current_user do
      nil -> ""
      %{email: email_val} when not is_nil(email_val) -> to_string(email_val)
      _ -> ""
    end

    first_letter = if email != "" do
      String.first(email) |> String.upcase()
    else
      "?"
    end

    user_id = case assigns.current_user do
      nil -> nil
      %{id: id_val} when not is_nil(id_val) -> id_val
      _ -> nil
    end

    # Store computed values in assigns to avoid HEEx warnings
    assigns = assign(assigns, :email, email)
    assigns = assign(assigns, :first_letter, first_letter)
    assigns = assign(assigns, :user_id, user_id)

    ~H"""
    <div class="dropdown dropdown-top dropdown-right w-full">
      <button
        type="button"
        tabindex="0"
        class="btn btn-ghost w-full justify-start gap-3 px-4 h-12 min-h-12 focus:outline-none focus:ring-2 focus:ring-primary focus:ring-offset-2"
        aria-label={gettext("User menu")}
        aria-haspopup="menu"
      >
        <!-- Avatar: Zentriert, erste Buchstabe -->
        <div class="avatar placeholder shrink-0">
          <div class="w-8 h-8 rounded-full bg-neutral text-neutral-content flex items-center justify-center">
            <span class="text-sm font-semibold leading-none flex items-center justify-center" style="margin-top: 1px;">
              {@first_letter}
            </span>
          </div>
        </div>
        <span class="menu-label truncate flex-1 text-left">{@email}</span>
      </button>
      <ul
        tabindex="0"
        class="dropdown-content menu bg-base-100 rounded-box shadow-lg w-52 p-2 focus:outline-none absolute z-[100]"
        role="menu"
      >
        <li role="none">
          <%= if @user_id do %>
            <.link navigate={~p"/users/#{@user_id}"} role="menuitem" class="focus:outline-none focus:ring-2 focus:ring-primary focus:ring-offset-2">
              {gettext("Profile")}
            </.link>
          <% else %>
            <span class="opacity-50">{gettext("Profile")}</span>
          <% end %>
        </li>
        <li role="none">
          <.link href={~p"/sign-out"} role="menuitem" class="focus:outline-none focus:ring-2 focus:ring-primary focus:ring-offset-2">
            {gettext("Logout")}
          </.link>
        </li>
      </ul>
    </div>
    """
  end
end