module Parser
  
  def parser_context(page, attributes = {})
    Radius::Context.new do |c|
      c.define_tag 'snippet' do |tag|
        snippet = Snippet.first(:conditions => {:name => tag.attr['name']})
        if snippet
          snippet.content
        else
          t('nothing')
        end
      end
      c.define_tag 'language_bar' do
        @site.in_use_locales.map{ |locale|
          lang = I18nVariable.first(:conditions => {:key => locale})[locale]
          if I18n.locale.to_s.eql?(locale)
            lang
          else
            "<a href='?locale=#{locale}'>#{lang}</a>"
          end
        }.join(' | ')
      end
      c.define_tag 'locale' do |tag|
        case attributes[:locale]
          when 'create'
            var = I18nVariable.new(:key => (tag.attr['name'] rescue nil), :document_class => 'Text')
            @site.valid_locales.each do |locale|
              var[locale] = tag.attr[locale] rescue nil
            end
            var.save!
            res = ''
            res << "<r:locale id='#{var.id}' " 
            res << "name='#{var.key}' " if var.key
            @site.valid_locales.each do |locale|
              res << "#{locale}='#{var[locale]}' "
            end
            res << '/>'
          when 'show'
            var = I18nVariable.find(tag.attr['id'])
            res = ''
            res << "<r:locale " 
            res << "name='#{var.key}' " if var.key
            @site.valid_locales.each do |locale|
              res << "#{locale}='#{var[locale]}' "
            end
            res << '/>'
          when 'destroy'
            var = I18nVariable.find(tag.attr['id'])
            var.destroy
        end
      end
      c.define_tag 'multi_lang' do |tag|
        tag.expand
      end
      c.define_tag 'multi_lang:lang' do |tag|
        tag.expand if tag.attr['name'].eql?(I18n.locale.to_s)
      end
      c.define_tag 'css' do |tag|
        assets = Asset.any_in(:filename => tag.attr['name'].split(',').map(&:strip))
        res = ''
        assets.each do |asset|
          res << "<link href='#{asset.data.file.url}' rel='stylesheet' type='text/css' /> " if asset.data.file.content_type.eql?('text/css')
        end
        res
      end
      c.define_tag 'stylesheets' do |tag|
        res = ''
        res << "<link href='#{page.design.reset_css.url}' rel='stylesheet' type='text/css' />"
        res << "<link href='#{page.design.default_css.url}' rel='stylesheet' type='text/css' /> "
        theme = page.design.themes.detect{ |d| d.id == page.theme_id  }
        res << "<link href='#{theme.file.url}' rel='stylesheet' type='text/css' />" if theme
        res
      end
      c.define_tag 'javascripts' do |tag|
        res = ''
        page.design.javascripts.each do |js|
          res << "<script type='text/javascript' src='#{js.file.url}'></script>"
        end
        res
      end
      c.define_tag 'image' do |tag|
        asset = Asset.find(tag.attr['id'])
        if asset
          res = "<img src=#{asset.data.file.url} "
          tag.attr.each do |l|
            res << "#{l[0]}='#{l[1]}' "
          end
          res << '>'
        end
      end
      c.define_tag 'layout_part' do |tag|
        part = page.page_parts.detect{ |p| p.name.to_s == tag.attr['name'].to_s } rescue nil
        part.content
      end
      c.define_tag 'content' do |tag|
        part = page.page_parts.detect{ |p| p.name.to_s == tag.attr['name'].to_s } rescue nil
        part.content
      end
      c.define_tag 'link' do |tag|
        item = Item.first(:conditions => { :full_name => tag.attr['name'] })
        ret = ''
        ret << "<a href='#{tag.attr['name']}'>"
        ret << item.i18n_variable[I18n.locale]
        ret << '</a>'
      end
      c.define_tag 'menu' do |tag|
        home = get_homepage
        menu = page.design.layout.menu
        menu_level(home, 1, menu)
      end
    end
  end
  
  def parse_page(page)
    if page._type == 'Page'
      layout_content = page.design.layout.content.force_encoding('UTF-8')
      context = parser_context(page)
      parser = Radius::Parser.new(context, :tag_prefix => 'r')
      parser.parse(parser.parse(layout_content))
    end
  end
  
  def parse_page_edit(page)
    if page._type == 'Page'
      layout_content = page.design.layout.content.force_encoding('UTF-8')
      context = parser_context_edit(page)
      parser = Radius::Parser.new(context, :tag_prefix => 'r')
      parser.parse(parser.parse(layout_content))
    end
  end
  
  def parser_context_edit(page, attributes = {})
    Radius::Context.new do |c|
      c.define_tag 'snippet' do |tag|
        snippet = Snippet.first(:conditions => {:name => tag.attr['name']})
        if snippet
          snippet.content
        else
          t('nothing')
        end
      end
      c.define_tag 'language_bar' do
        @site.in_use_locales.map{ |locale|
          lang = I18nVariable.first(:conditions => {:key => locale})[locale]
          if I18n.locale.to_s.eql?(locale)
            lang
          else
            "<a href='?locale=#{locale}'>#{lang}</a>"
          end
        }.join(' | ')
      end
      c.define_tag 'multi_lang' do |tag|
        tag.expand
      end
      c.define_tag 'multi_lang:lang' do |tag|
        tag.expand if tag.attr['name'].eql?(I18n.locale.to_s)
      end
      c.define_tag 'css' do |tag|
        assets = Asset.any_in(:filename => tag.attr['name'].split(',').map(&:strip))
        res = ''
        assets.each do |asset|
          res << "<link href='#{asset.data.file.url}' rel='stylesheet' type='text/css' /> " if asset.data.file.content_type.eql?('text/css')
        end
        res
      end
      c.define_tag 'image' do |tag|
        asset = Asset.find(tag.attr['id'])
        if asset
          res = "<img src=#{asset.data.file.url} "
          tag.attr.each do |l|
            res << "#{l[0]}='#{l[1]}' "
          end
          res << '>'
        end
      end
      c.define_tag 'stylesheets' do |tag|
        res = ''
        res << "<link href='#{page.design.reset_css.url}' rel='stylesheet' type='text/css' />"
        res << "<link href='#{page.design.default_css.url}' rel='stylesheet' type='text/css' />"
        theme = page.design.themes.detect{ |d| d.id == page.theme_id  }
        res << "<link href='#{theme.file.url}' rel='stylesheet' type='text/css' />" if theme
        res
      end
      c.define_tag 'javascripts' do |tag|
        res = ''
        page.design.javascripts.each do |js|
          res << "<script type='text/javascript' src='#{js.file.url}'></script>"
        end
        res
      end
      c.define_tag 'layout_part' do |tag|
        part = page.page_parts.detect{ |p| p.name.to_s == tag.attr['name'].to_s }
        ret = ''
        ret << "<div id='#{tag.attr['name']}' part_id='#{part.id}'>"
        ret << tag.expand
        ret << '</div>'
      end
      c.define_tag 'content' do |tag|
        part = page.page_parts.detect{ |p| p.name.to_s == tag.attr['name'].to_s }
        ret = ''
        ret << "<div id='#{tag.attr['name']}' part_id='#{part.id}' class='editable' style='border:solid 1px; margin:5px; padding:5px;'>"
        ret << "<div class='edit_link' style='display:none'>"
        ret << " <a href='#{edit_admin_page_part_path(part.id)}' class='nav'>#{t(:edit)}</a>"
        ret << '</div>'
        ret << part.i18n_variable[I18n.locale.to_s] rescue ''
        ret << '</div>'
      end
      c.define_tag 'link' do |tag|
        item = Item.first(:conditions => { :full_name => tag.attr['name'] })
        ret = ''
        ret << "<a href='"
        ret << eval("admin_#{item._type.downcase}_path(item.id)")
        ret << "' class='nav'>"
        ret << item.i18n_variable[I18n.locale]
        ret << "</a>"
      end
      c.define_tag 'menu' do |tag|
        home = get_homepage
        menu = page.design.layout.menu
        menu_level(home, 1, menu, true)
      end
    end
  end
  
  def menu_level(page, current, menu, edit = false)
    if current <= menu.levels
      res = "<ul id="
      res << menu.values["id_#{current}"]
      res << " class="
      res << menu.values["class_#{current}"]
      res << ">"
      i = nil
      i = 1 if menu.values["li_incremental_#{current}"]
      if current == 1 && menu.values['home'].eql?('true')
        res << menu_li(page, current, menu, i, edit)
        i += 1 if i
      end
      page.children.each do |child|
        res << menu_li(child, current, menu, i, edit)
        i += 1 if i
      end
      res << "</ul>"
    end
  end
  
  def menu_li(page, current, menu, i, edit)
    res = "<li class="
    res << menu.values["li_class_#{current}"]
    res << "_#{i}" if i
    res << ">"
    res << "<a href='#{edit ? admin_page_path(page.id) : page.full_name}'>#{page.name}</a>"  
    res << menu_level(page, current + 1, menu, edit) if page.children.size > 0 && !page.is_home?
    res << "</li>"
  end
  
  #=============
  def parse_layout_contents(layout)
    content = layout.content.force_encoding('UTF-8')
    context = parser_layout_contents(layout)
    parser = Radius::Parser.new(context, :tag_prefix => 'r')
    parser.parse(content)
  end

  def parser_layout_contents(layout )
    Radius::Context.new do |c|
      c.define_tag 'javascripts' do |tag|
      end
      c.define_tag 'stylesheets' do |tag|
      end
      c.define_tag 'menu' do |tag|
        layout.build_menu(:levels => 0, :values => {}) unless layout.menu
        layout.menu.levels = i = tag.attr['level'].to_i
        layout.menu.values.merge!({'home' => tag.attr['home']}) if i == 1
        layout.menu.values.merge!({"id_#{i}" => tag.attr['id'], "class_#{i}" => tag.attr['class'], "li_class_#{i}" => tag.attr['li_class'], "li_incremental_#{i}" => tag.attr['li_incremental']})
        layout.menu.save
        tag.expand
      end
      c.define_tag 'content' do |tag|
        layout.layout_parts.create(:name => tag.attr['name'], :editable => true)
      end
    end
  end

  def self.included(base)
    base.send :helper_method, :parse_page if base.respond_to? :helper_method
    base.send :helper_method, :parse_page_edit if base.respond_to? :helper_method
  end

end