module Middleman::Helpers

def asset_url(path, prefix="")
  self.class.asset_url(path, prefix, request)
end

def image_tag(path, params={})
  params[:alt] ||= ""
  prefix = options.http_images_path rescue options.images_dir
  params = params.merge(:src => asset_url(path, prefix))
  params = params.map { |k,v| %Q{#{k}="#{v}"}}.join(' ')
  "<img #{params} />"
end

def javascript_include_tag(path, params={})
  params = params.merge(:src => asset_url(path, options.js_dir), :type => "text/javascript")
  params = params.map { |k,v| %Q{#{k}="#{v}"}}.join(' ')
  "<script #{params}></script>"
end

def link_to(title, url="#", params={})
  params.merge!(:href => url)
  params = params.map { |k,v| %Q{#{k}="#{v}"}}.join(' ')
  %Q{<a #{params}>#{title}</a>}
end

def page_classes(*additional)
  path = request.path_info
  path << options.index_file if path.match(%r{/$})
  path.gsub!(%r{^/}, '')
  classes = []
  parts = path.split('.')[0].split('/')
  parts.each_with_index { |path, i| classes << parts.first(i+1).join('_') }
  classes << "index" if classes.empty?
  classes += additional unless additional.empty?
  classes.join(' ')
end

def stylesheet_link_tag(path, params={})
  params[:rel] ||= "stylesheet"
  params = params.merge(:href => asset_url(path, options.css_dir), :type => "text/css")
  params = params.map { |k,v| %Q{#{k}="#{v}"}}.join(' ')
  "<link #{params} />"
end