# 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`.
    # `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
      warn_on_deprecated_slot_setter
      status :beta

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

      # @example Default
      #
      #   <%= render(Primer::Beta::IconButton.new(icon: :search, "aria-label": "Search", id: "search-button", id: "search-button")) %>
      #
      # @example Schemes
      #
      #   <%= render(Primer::Beta::IconButton.new(icon: :search, "aria-label": "Search")) %>
      #   <%= render(Primer::Beta::IconButton.new(icon: :trash, "aria-label": "Delete", scheme: :danger)) %>
      #
      # @example With an `aria-description`
      #   @description
      #     If you need to have a longer description for the icon button, use both the `aria-label` and `aria-description`
      #     attributes. A label should be short and concise, while the description can be longer as it is intended to provide
      #     more context and information. See the accessibility section for more information.
      #   @code
      #     <%= render(Primer::Beta::IconButton.new(icon: :bold, "aria-label": "Bold", "aria-description": "Add bold text, Cmd+b")) %>
      #
      # @example Custom tooltip direction
      #
      #   <%= render(Primer::Beta::IconButton.new(icon: :search, "aria-label": "Search", tooltip_direction: :e)) %>
      #
      # @param icon [String] Name of <%= link_to_octicons %> to use.
      # @param wrapper_arguments [Hash] Optional keyword arguments to be passed to the wrapper `<div>` tag.
      # @param scheme [Symbol] <%= one_of(Primer::Beta::IconButton::SCHEME_OPTIONS) %>
      # @param size [Symbol] <%= one_of(Primer::Beta::Button::SIZE_OPTIONS) %>
      # @param tag [Symbol] <%= one_of(Primer::Beta::BaseButton::TAG_OPTIONS) %>
      # @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, wrapper_arguments: {}, show_tooltip: true, tooltip_direction: Primer::Alpha::Tooltip::DIRECTION_DEFAULT, size: Primer::Beta::Button::DEFAULT_SIZE, **system_arguments)
        @icon = icon

        @wrapper_arguments = wrapper_arguments
        @show_tooltip = show_tooltip
        @system_arguments = system_arguments
        @system_arguments[:id] ||= "icon-button-#{SecureRandom.hex(4)}"

        @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)

        @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
      end

      private

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