module Spree::BaseHelper

  def link_to_cart(text = t('cart'))
    return "" if current_page?(cart_path)
    css_class = nil
    if current_order.nil? or current_order.line_items.empty?
      text = "#{text}: (#{t('empty')})"
      css_class = 'empty'
    else
      text = "#{text}: (#{current_order.item_count}) #{order_price(current_order)}"
      css_class = 'full'
    end
    link_to text, cart_path, :class => css_class
  end

  def order_price(order, options={})
    options.assert_valid_keys(:format_as_currency, :show_vat_text, :show_price_inc_vat)
    options.reverse_merge! :format_as_currency => true, :show_vat_text => true

    # overwrite show_vat_text if show_price_inc_vat is false
    options[:show_vat_text] = Spree::Config[:show_price_inc_vat]

    amount =  order.total

    options.delete(:format_as_currency) ? number_to_currency(amount) : amount
  end

  def todays_short_date
    utc_to_local(Time.now.utc).to_ordinalized_s(:stub)
  end

  def yesterdays_short_date
    utc_to_local(Time.now.utc.yesterday).to_ordinalized_s(:stub)
  end

  # human readable list of variant options
  def variant_options(v, allow_back_orders = Spree::Config[:allow_backorders], include_style = true)
    ActiveSupport::Deprecation.warn("variant_options method is deprecated, and will be removed in 0.80.0", caller)
    list = v.options_text

    # We shouldn't show out of stock if the product is infact in stock
    # or when we're not allowing backorders.
    unless (allow_back_orders || v.in_stock?)
      list = if include_style
        content_tag(:span, "(#{t(:out_of_stock)}) #{list}", :class => "out-of-stock")
      else
        "#{t(:out_of_stock)} #{list}"
      end
    end

    list
  end

  Image.attachment_definitions[:attachment][:styles].each do |style, v|
    define_method "#{style}_image" do |product, *options|
      options = options.first || {}
      if product.images.empty?
        image_tag "noimage/#{style}.png", options
      else
        image = product.images.first
        options.reverse_merge! :alt => image.alt.blank? ? product.name : image.alt
        image_tag image.attachment.url(style), options
      end
    end
  end

  def meta_data_tags
    object = instance_variable_get('@'+controller_name.singularize)
    meta = { :keywords => Spree::Config[:default_meta_keywords], :description => Spree::Config[:default_meta_description] }

    if object.kind_of?(ActiveRecord::Base)
      meta[:keywords] = object.meta_keywords if object[:meta_keywords].present?
      meta[:description] = object.meta_description if object[:meta_description].present?
    end

    meta.map do |name, content|
      tag('meta', :name => name, :content => content)
    end.join("\n")
  end

  def body_class
    @body_class ||= content_for?(:sidebar) ? 'two-col' : 'one-col'
    @body_class
  end

  def stylesheet_tags(paths=stylesheet_paths)
    paths.blank? ? '' : stylesheet_link_tag(paths, :cache => true)
  end

  def stylesheet_paths
    paths = Spree::Config[:stylesheets]
    if (paths.blank?)
      []
    else
      paths.split(',')
    end
  end

  def logo(image_path=Spree::Config[:logo])
    link_to image_tag(image_path), root_path
  end

  def flash_messages
    [:notice, :error].map do |msg_type|
      if flash[msg_type]
        content_tag :div, flash[msg_type], :class => "flash #{msg_type}"
      else
        ''
      end
    end.join("\n").html_safe
  end

  def breadcrumbs(taxon, separator=" » ")
    return "" if current_page?("/") || taxon.nil?
    separator = raw(separator)
    crumbs = [content_tag(:li, link_to(t(:home) , root_path) + separator)]
    if taxon
      crumbs << content_tag(:li, link_to(t('products') , products_path) + separator)
      crumbs << taxon.ancestors.collect { |ancestor| content_tag(:li, link_to(ancestor.name , seo_url(ancestor)) + separator) } unless taxon.ancestors.empty?
      crumbs << content_tag(:li, content_tag(:span, taxon.name))
    else
      crumbs << content_tag(:li, content_tag(:span, t('products')))
    end
    crumb_list = content_tag(:ul, raw(crumbs.flatten.map{|li| li.mb_chars}.join))
    content_tag(:div, crumb_list + tag(:br, {:class => 'clear'}, false, true), :id => 'breadcrumbs')
  end

  def taxons_tree(root_taxon, current_taxon, max_level = 1)
    return '' if max_level < 1 || root_taxon.children.empty?
    content_tag :ul, :class => 'taxons-list' do
      root_taxon.children.map do |taxon|
        css_class = (current_taxon && current_taxon.self_and_ancestors.include?(taxon)) ? 'current' : nil
        content_tag :li, :class => css_class do
         link_to(taxon.name, seo_url(taxon)) +
         taxons_tree(taxon, current_taxon, max_level - 1)
        end
      end.join("\n").html_safe
    end
  end

  def available_countries
    return Country.all unless zone = Zone.find_by_name(Spree::Config[:checkout_zone])
    zone.country_list
  end

  def format_price(price, options={})
    options.assert_valid_keys(:show_vat_text)
    options.reverse_merge! :show_vat_text => Spree::Config[:show_price_inc_vat]
    formatted_price = number_to_currency price
    if options[:show_vat_text]
      I18n.t(:price_with_vat_included, :price => formatted_price)
    else
      formatted_price
    end
  end

  # generates nested url to product based on supplied taxon
  def seo_url(taxon, product = nil)
    return '/t/' + taxon.permalink if product.nil?
    warn "DEPRECATION: the /t/taxon-permalink/p/product-permalink urls are "+
      "not used anymore. Use product_url instead. (called from #{caller[0]})"
    return product_url(product)
  end

  def current_orders_product_count
    if current_order.blank? || current_order.item_count < 1
      return 0
    else
      return current_order.item_count
    end
  end

end