module Padrino::Helpers::AssetTagHelpers

def asset_path(kind, source)
  return source if source =~ /^http/
  asset_folder  = case kind
    when :css then 'stylesheets'
    when :js  then 'javascripts'
    else kind.to_s
  end
  source = source.to_s.gsub(/\s/, '%20')
  ignore_extension = (asset_folder.to_s == kind.to_s) # don't append extension
  source << ".#{kind}" unless ignore_extension or source =~ /\.#{kind}/
  result_path   = source if source =~ %r{^/} # absolute path
  result_path ||= uri_root_path(asset_folder, source)
  timestamp = asset_timestamp(result_path)
  "#{result_path}#{timestamp}"
end

def asset_timestamp(file_path)
  return nil if file_path =~ /\?/ || (self.class.respond_to?(:asset_stamp) && !self.class.asset_stamp)
  public_path = Padrino.root("public", file_path) if Padrino.respond_to?(:root)
  stamp = Time.now.to_i unless public_path && File.exist?(public_path)
  stamp ||= File.mtime(public_path).to_i
  "?#{stamp}"
end

def button_to(*args, &block)
  name, url = args[0], args[1]
  options   = args.extract_options!
  desired_method = options[:method]
  options.delete(:method) if options[:method].to_s !~ /get|post/i
  options.reverse_merge!(:method => 'post', :action => url)
  options[:enctype] = "multipart/form-data" if options.delete(:multipart)
  options["data-remote"] = "true" if options.delete(:remote)
  inner_form_html  = hidden_form_method_field(desired_method)
  inner_form_html += block_given? ? capture_html(&block) : submit_tag(name)
  content_tag('form', inner_form_html, options)
end

def favicon_tag(source, options={})
  type = File.extname(source).gsub('.','')
  options = options.dup.reverse_merge!(:href => image_path(source), :rel => 'icon', :type => "image/#{type}")
  tag(:link, options)
end

def feed_tag(mime, url, options={})
  full_mime = (mime == :atom) ? 'application/atom+xml' : 'application/rss+xml'
  content_tag(:link, options.reverse_merge(:rel => 'alternate', :type => full_mime, :title => mime, :href => url))
end

def flash_tag(kind, options={})
  flash_text = flash[kind]
  return '' if flash_text.blank?
  options.reverse_merge!(:class => kind)
  content_tag(:div, flash_text, options)
end

def image_path(src)
  asset_path(:images, src)
end

def image_tag(url, options={})
  options.reverse_merge!(:src => image_path(url))
  tag(:img, options)
end

def javascript_include_tag(*sources)
  options = sources.extract_options!.symbolize_keys
  options.reverse_merge!(:type => 'text/javascript', :content => "")
  sources.flatten.map { |source|
    tag(:script, options.reverse_merge(:src => asset_path(:js, source)))
  }.join("\n")
end

def link_to(*args, &block)
  options = args.extract_options!
  options = parse_js_attributes(options) # parses remote, method and confirm options
  anchor  = "##{CGI.escape options.delete(:anchor).to_s}" if options[:anchor]
  if block_given?
    url = args[0] ? args[0] + anchor.to_s : anchor || 'javascript:void(0);'
    options.reverse_merge!(:href => url)
    link_content = capture_html(&block)
    return '' unless parse_conditions(url, options)
    result_link = content_tag(:a, link_content, options)
    block_is_template?(block) ? concat_content(result_link) : result_link
  else
    name, url = args[0], (args[1] ? args[1] + anchor.to_s : anchor || 'javascript:void(0);')
    return name unless parse_conditions(url, options)
    options.reverse_merge!(:href => url)
    content_tag(:a, name, options)
  end
end

def mail_to(email, caption=nil, mail_options={})
  html_options = mail_options.slice!(:cc, :bcc, :subject, :body)
  mail_query = Rack::Utils.build_query(mail_options).gsub(/\+/, '%20').gsub('%40', '@')
  mail_href = "mailto:#{email}"; mail_href << "?#{mail_query}" if mail_query.present?
  link_to((caption || email), mail_href, html_options)
end

def meta_tag(content, options={})
  options.reverse_merge!("content" => content)
  tag(:meta, options)
end

def parse_conditions(url, options)
  if options.has_key?(:if)
    condition = options.delete(:if)
    condition == :current ? url == request.path_info : condition
  elsif condition = options.delete(:unless)
    condition == :current ? url != request.path_info : !condition
  else
    true
  end
end

def parse_js_attributes(options)
  options = options.dup
  options["data-remote"] = "true" if options.delete(:remote)
  if link_confirm = options.delete(:confirm)
    options["data-confirm"] = link_confirm
  end
  if link_method = options.delete(:method)
    options["data-method"] = link_method
    options["rel"] = "nofollow"
  end
  options
end

def stylesheet_link_tag(*sources)
  options = sources.extract_options!.symbolize_keys
  options.reverse_merge!(:media => 'screen', :rel => 'stylesheet', :type => 'text/css')
  sources.flatten.map { |source|
    tag(:link, options.reverse_merge(:href => asset_path(:css, source)))
  }.join("\n")
end

def uri_root_path(*paths)
  root_uri = self.class.uri_root if self.class.respond_to?(:uri_root)
  File.join(ENV['RACK_BASE_URI'].to_s, root_uri || '/', *paths)
end