module WeatherIcons
  module Rails
    module IconHelpers
      # Creates an icon tag given an icon name and possible icon
      # modifiers.
      #
      # Examples
      #
      #   wi_icon "day-hail"
      #   # => <i class="wi wi-day-hail"></i>
      #
      #   wi_icon "day-hail", text: "Hailing Outside!"
      #   # => <i class="wi wi-day-hail"></i> Hailing Outside
      #
      #   wi_icon "day-hail 2x"
      #   # => <i class="wi wi-day-hail wi-2x"></i>
      #   wi_icon ["day-hail", "4x"]
      #   # => <i class="wi wi-day-hail wi-4x"></i>
      #   wi_icon "wi-day-hail spin lg"
      #   # => <i class="wi wi-day-hail wi-spin wi-lg">
      #
      #   wi_icon "day-hail 4x", class: "pull-left"
      #   # => <i class="wi wi-day-hail wi-4x pull-left"></i>
      #
      #   wi_icon "day-hail", data: { id: 123 }
      #   # => <i class="wi wi-day-hail" data-id="123"></i>
      #
      #   content_tag(:li, wi_icon("day-hail li", text: "Bulleted list item"))
      #   # => <li><i class="wi wi-day-hail wi-li"></i> Bulleted list item</li>
      def wi_icon(names = "flag", options = {})
        classes = ['wi']
        classes.concat Private.icon_names(names)
        classes.concat Array(options.delete(:class))
        text = options.delete(:text)
        icon = content_tag(:i, nil, options.merge(:class => classes))
        Private.icon_join(icon, text)
      end

      # Creates an stack set of icon tags given a base icon name, a main icon
      # name, and possible icon modifiers.
      #
      # Examples
      #
      #   wi_stacked_icon "day-hail", base: "day-cloudy-gusts"
      #   # => <span class="wi-stack">
      #   # =>   <i class="wi wi-day-cloudy-gusts wi-stack-2x"></i>
      #   # =>   <i class="wi wi-day-hail wi-stack-1x"></i>
      #   # => </span>
      #
      #   wi_stacked_icon "day-hail inverse", base: "lightning", class: "pull-right", text: "Hi!"
      #   # => <span class="wi-stack pull-right">
      #   # =>   <i class="wi wi-lightning wi-stack-2x"></i>
      #   # =>   <i class="wi wi-day-hail wi-inverse wi-stack-1x"></i>
      #   # => </span> Hi!
      #
      #   wi_stacked_icon "lightning", base: "day-cloudy-gusts", reverse: true
      #   # => <span class="wi-stack">
      #   # =>   <i class="wi wi-lightning wi-stack-1x"></i>
      #   # =>   <i class="wi wi-day-cloudt-gusts wi-stack-2x"></i>
      #   # => </span>
      def wi_stacked_icon(names = "flag", options = {})
        classes = Private.icon_names("stack").concat(Array(options.delete(:class)))
        base_names = Private.array_value(options.delete(:base) || "wi-lightning").push("stack-2x")
        names = Private.array_value(names).push("stack-1x")
        base = wi_icon(base_names, options.delete(:base_options) || {})
        icon = wi_icon(names, options.delete(:icon_options) || {})
        icons = [base, icon]
        icons.reverse! if options.delete(:reverse)
        text = options.delete(:text)
        stacked_icon = content_tag(:span, safe_join(icons), options.merge(:class => classes))
        Private.icon_join(stacked_icon, text)
      end

      # Creates a list item with the specified icon as the marker.
      # To be used with an ul tag having a class of wi-ul
      #
      # Examples
      #
      #   wi_list_item('day-hail', 'Bad Weather Today')
      #   # => <li><i class="wi wi-day-hail wi-li"></i> Bad Weather Today</li>
      #
      #   wi_list_item('day-hail md', 'Bad Weather Today', icon_options: {class: 'inverse'}, class: 'something' )
      #   # => <li class="something"><i class="wi wi-day-hail wi-md wi-li inverse"></i> Bad Weather Today</li>
      def wi_list_item(icon_name, string, options={})
        icons_options = {text: string}.merge(Hash(options[:icon_options]))
        content_tag(:li, wi_icon("#{icon_name} li", icons_options), options.reject{|key,value| key == :icon_options})
      end

      # Creates an unordered list with the specified icon as the markers.
      #
      # Examples
      #
      #   wi_list('day-hail', ['Bad Weather', 'Good Weather'])
      #   # => <ul class: 'wi-ul'>
      #   # =>   <li>
      #   # =>     <i class="wi wi-day-hail wi-li"></i> Bad Weather
      #   # =>   </li>
      #   # =>   <li>
      #   # =>     <i class="wi wi-day-hail wi-li"></i> Good Weather
      #   # =>   </li>
      #   # => </ul>
      #
      #   wi_list('day-hail lg', ['Bad Weather', 'Good Weather'], icon_options: {class: 'pull-right'}, class: 'something' )
      #   # => <ul class: 'wi-ul'>
      #   # =>   <li class="something">
      #   # =>     <i class="wi wi-day-hail wi-lg wi-li pull-right"></i> Bad Weather
      #   # =>   </li>
      #   # =>   <li class="something">
      #   # =>     <i class="wi wi-day-hail wi-lg wi-li pull-right"></i> Good Weather
      #   # =>   </li>
      #   # => </ul>
      def wi_list(icon_name, strings, options={})
        list_items = strings.map { |str| wi_list_item(icon_name, str, options) }
        content_tag(:ul, safe_join(list_items), class: Private.icon_names('ul'))
      end

      module Private
        extend ActionView::Helpers::OutputSafetyHelper

        def self.icon_join(icon, text)
          return icon if text.blank?
          safe_join([icon, ERB::Util.html_escape(text)], " ")
        end

        def self.icon_names(names = [])
          array_value(names).map { |n| "wi-#{n}" }
        end

        def self.array_value(value = [])
          value.is_a?(Array) ? value : value.to_s.split(/\s+/)
        end
      end
    end
  end
end