# frozen_string_literal: true

module Primer
  # Use `Menu` to create vertical lists of navigational links.
  class MenuComponent < Primer::Component
    HEADING_TAG_OPTIONS = [:h1, :h2, :h3, :h4, :h5, :h6].freeze
    HEADING_TAG_FALLBACK = :h2

    # Optional menu heading
    #
    # @param tag [Symbol] <%= one_of(Primer::MenuComponent::HEADING_TAG_OPTIONS) %>
    # @param system_arguments [Hash] <%= link_to_system_arguments_docs %>
    renders_one :heading, lambda { |tag:, **system_arguments|
      system_arguments[:tag] = fetch_or_fallback(HEADING_TAG_OPTIONS, tag, HEADING_TAG_FALLBACK)
      system_arguments[:classes] = class_names(
        "menu-heading",
        system_arguments[:classes]
      )

      Primer::BaseComponent.new(**system_arguments)
    }

    # Required list of navigational links
    #
    # @param href [String] URL to be used for the Link
    # @param selected [Boolean] Whether the item is the current selection
    # @param system_arguments [Hash] <%= link_to_system_arguments_docs %>
    renders_many :items, lambda { |href:, selected: false, **system_arguments|
      deny_tag_argument(**system_arguments)
      system_arguments[:tag] = :a
      system_arguments[:href] = href
      system_arguments[:"aria-current"] = :page if selected
      system_arguments[:classes] = class_names(
        "menu-item",
        system_arguments[:classes]
      )

      Primer::BaseComponent.new(**system_arguments)
    }

    # @example Default
    #   <%= render(Primer::MenuComponent.new) do |c| %>
    #     <% c.with_heading(tag: :h2) do %>
    #       Heading
    #     <% end %>
    #     <% c.with_item(selected: true, href: "#url") do %>
    #       Item 1
    #     <% end %>
    #     <% c.with_item(href: "#url") do %>
    #       <%= render(Primer::OcticonComponent.new("check")) %>
    #       With Icon
    #     <% end %>
    #     <% c.with_item(href: "#url") do %>
    #       <%= render(Primer::OcticonComponent.new("check")) %>
    #       With Icon and Counter
    #       <%= render(Primer::Beta::Counter.new(count: 25)) %>
    #     <% end %>
    #   <% end %>
    #
    # @param system_arguments [Hash] <%= link_to_system_arguments_docs %>
    def initialize(**system_arguments)
      @system_arguments = deny_tag_argument(**system_arguments)
      @system_arguments[:tag] = :nav
      @system_arguments[:classes] = class_names(
        "menu",
        @system_arguments[:classes]
      )
    end

    def render?
      items.any?
    end
  end
end