# main class for erubis template rendering
require 'erubis'

class ErubisTemplate < BaseDrop
  include UrlFilters
  include DropFilters
  include CoreFilters

  def initialize(site)
    @site_source = site
  end

  def liquify(*records, &block)
    self.class.liquify(@context, *records, &block)
  end
  
  def render(section, layout, template, assigns ={}, controller = nil)
    @layout = layout
    @template = template
    @controller = controller
    @assigns = assigns
    # psq-TODO: assigns contains mode, site, articles, section (more or less depending on mode,
    # consider using missing method to expose all of them to templates)
    # "section" would be nicer than
    # "@assigns['section']"
    @context = ::Liquid::Context.new(assigns, {}, false) # assigns, register, rethrow error

    @mode = assigns['mode']
    @archive_date = assigns['archive_date']

    @articles = assigns['articles']
    @articles.each { |article| article.context = @context } if (@articles)
    @article = assigns['article']
    @article.context = @context if @article
    
    # psq-TODO can't see how this has a value
    @submitted = @context['submitted'] || {}
    @submitted.each{ |k, v| @submitted[k] = CGI::escapeHTML(v) }

    @site = @site_source.to_liquid
    @site.context = @context
    if (section)
      @section = section.to_liquid
      @section.context = @context
    end

    to_html
  end


# entry point for rendering layout and main_template to html
# not reentrant at this point because of the use of @ouput and @binding
  def to_html
    @binding = get_binding #use the same binding throughout
    do_include(@layout)
  end
  
# 
# in layout, include content using chosen template
# <% main_content %>
#
  def main_content
    do_include(@template)
  end

# include template
# <% include "template name" %>
  def include(template)
    do_include(@site_source.find_preferred_template(:page, template+".erubis"))
  end

protected
  def do_include(erubis_template)
    # need to save/restore _buf (somewhat internal to how Eruby generates the template) since everything is using the same binding.
    # psq-TODO: if page caching is not working well enough, keeping a compiled version of the template could help
    # see ActionView::CompiledTemplates
    begin
      eval "_context.push(_buf)", @binding
      result = Erubis::Eruby.new(erubis_template.read.to_s).result @binding
      eval "_buf = _context.pop", @binding
      result
    rescue
      raise "Erubis Error: #{$!}"
    end
  end

  def get_binding
    _buf = ''
    _context = []
    binding
  end
end