# frozen_string_literal: true

require "octicons"

module Primer
  # OcticonSymbols renders a symbol dictionary using a list of <%= link_to_octicons %>.
  class OcticonSymbolsComponent < Primer::Component
    # @example Symbol dictionary
    #   <%= render(Primer::OcticonComponent.new(icon: :check, use_symbol: true, color: :success)) %>
    #   <%= render(Primer::OcticonComponent.new(icon: :check, use_symbol: true, color: :danger)) %>
    #   <%= render(Primer::OcticonComponent.new(icon: :check, use_symbol: true, size: :medium)) %>
    #   <%= render(Primer::OcticonSymbolsComponent.new(icons: [{ symbol: :check }, { symbol: :check, size: :medium }])) %>
    #
    # @param icons [Array<Hash>] List of icons to render, in the format { symbol: :icon_name, size: :small }
    def initialize(icons: [])
      @icons = {}
      icons.each do |icon|
        symbol = icon[:symbol]
        size = Primer::OcticonComponent::SIZE_MAPPINGS[
          fetch_or_fallback(Primer::OcticonComponent::SIZE_OPTIONS, icon[:size] || Primer::OcticonComponent::SIZE_DEFAULT, Primer::OcticonComponent::SIZE_DEFAULT)
        ]

        cache_key = Primer::Octicon::Cache.get_key(symbol: symbol, size: size)

        if (cache_icon = Primer::Octicon::Cache.read(cache_key))
          icon_instance = cache_icon
        else
          icon_instance = Octicons::Octicon.new(symbol, height: size)

          Primer::Octicon::Cache.set(cache_key, icon_instance)
        end

        # Don't put the same icon twice
        @icons[[symbol, icon_instance.height]] = icon_instance if @icons[[symbol, icon_instance.height]].nil?
      end
    end

    def render?
      @icons.any?
    end

    def self._after_compile
      Primer::Octicon::Cache.preload!
    end

    def symbol_tags
      safe_join(
        @icons.values.map do |icon|
          content_tag(
            :symbol,
            icon.path.html_safe, # rubocop:disable Rails/OutputSafety
            id: "octicon_#{icon.symbol}_#{icon.height}",
            viewBox: icon.options[:viewBox],
            width: icon.width,
            height: icon.height
          )
        end
      )
    end
  end
end