# frozen_string_literal: true

module Primer
  module Beta
    # Use `IconButton` to render Icon-only buttons without the default button styles.
    #
    # `IconButton` will always render with a tooltip unless the tag is `:summary`.
    #
    # @accessibility
    #   `IconButton` requires an `aria-label`, which will provide assistive technologies with an accessible label.
    #   The `aria-label` should describe the action to be invoked rather than the icon itself. For instance,
    #   if your `IconButton` renders a magnifying glass icon and invokes a search action, the `aria-label` should be
    #   `"Search"` instead of `"Magnifying glass"`.
    #   Either `aria-label` or `aria-description` will be used for the `Tooltip` text, depending on which one is present.
    #   Either `aria-label` or `aria-description` will be used for the `Tooltip` text, depending on which one is present.
    #   [Learn more about best functional image practices (WAI Images)](https://www.w3.org/WAI/tutorials/images/functional)
    class IconButton < Primer::Component
      status :beta

      DEFAULT_SCHEME = :default
      SCHEME_MAPPINGS = {
        DEFAULT_SCHEME => "Button--secondary",
        :danger => "Button--danger",
        :invisible => "Button--invisible"
      }.freeze
      SCHEME_OPTIONS = SCHEME_MAPPINGS.keys

      # @param icon [String] Name of <%= link_to_octicons %> to use.
      # @param tag [Symbol] <%= one_of(Primer::Beta::BaseButton::TAG_OPTIONS) %>
      # @param scheme [Symbol] <%= one_of(Primer::Beta::IconButton::SCHEME_OPTIONS) %>
      # @param size [Symbol] <%= one_of(Primer::Beta::Button::SIZE_OPTIONS) %>
      # @param disabled [Boolean] Whether or not the button is disabled. If true, this option forces `tag:` to `:button`.
      # @param type [Symbol] <%= one_of(Primer::Beta::BaseButton::TYPE_OPTIONS) %>
      # @param aria-label [String] String that can be read by assistive technology. A label should be short and concise. See the accessibility section for more information.
      # @param aria-description [String] String that can be read by assistive technology. A description can be longer as it is intended to provide more context and information. See the accessibility section for more information.
      # @param show_tooltip [Boolean] Whether or not to show a tooltip when this button is hovered. Tooltips should only be hidden if the aria label is redundant, i.e. if the icon has a widely understood definition.
      # @param tooltip_direction [Symbol] (Primer::Alpha::Tooltip::DIRECTION_DEFAULT) <%= one_of(Primer::Alpha::Tooltip::DIRECTION_OPTIONS) %>
      # @param system_arguments [Hash] <%= link_to_system_arguments_docs %>
      def initialize(icon:, scheme: DEFAULT_SCHEME, show_tooltip: true, tooltip_direction: Primer::Alpha::Tooltip::DIRECTION_DEFAULT, size: Primer::Beta::Button::DEFAULT_SIZE, disabled: false, **system_arguments)
        @icon = icon

        @show_tooltip = show_tooltip
        @system_arguments = system_arguments
        @system_arguments[:id] ||= self.class.generate_id
        @system_arguments[:disabled] = disabled

        @system_arguments[:classes] = class_names(
          "Button",
          "Button--iconOnly",
          SCHEME_MAPPINGS[fetch_or_fallback(SCHEME_OPTIONS, scheme, DEFAULT_SCHEME)],
          Primer::Beta::Button::SIZE_MAPPINGS[fetch_or_fallback(Primer::Beta::Button::SIZE_OPTIONS, size, Primer::Beta::Button::DEFAULT_SIZE)],
          system_arguments[:classes]
        )

        validate_aria_label

        @aria_label = aria("label", @system_arguments)
        @aria_description = aria("description", @system_arguments)

        return unless render_tooltip?

        @tooltip_arguments = {
          for_id: @system_arguments[:id],
          direction: tooltip_direction
        }

        # If we have both an `aria-label` and a `aria-description`, we create a `Tooltip` with the description type and keep the `aria-label` in the button.
        # Otherwise, the `aria-label` is used as the tooltip text, which is the `aria-labelled-by` of the button, so we don't set it in the button.
        if @aria_label.present? && @aria_description.present?
          @system_arguments.delete(:"aria-description")
          @system_arguments[:aria].delete(:description) if @system_arguments.include?(:aria)
          @tooltip_arguments[:text] = @aria_description
          @tooltip_arguments[:type] = :description
        else
          @system_arguments.delete(:"aria-label")
          @system_arguments[:aria].delete(:label) if @system_arguments.include?(:aria)
          @tooltip_arguments[:text] = @aria_label
          @tooltip_arguments[:type] = :label
        end

        @tooltip = Primer::Alpha::Tooltip.new(**@tooltip_arguments)
        aria_key = @tooltip_arguments[:type] == :label ? :labelledby : :describedby

        @system_arguments[:aria] = merge_aria(
          @system_arguments, { aria: { aria_key => @tooltip.id } }
        )
      end

      private

      def render_tooltip?
        @show_tooltip && @system_arguments[:tag] != :summary
      end
    end
  end
end