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def construct_search_query
	query = '*' 
	query << 'AND (' << params[:search_all] << ')' if params[:search_all] && params[:search_all].length > 3
	query << ' AND (' << params[:search_any].split(' ').join('OR') <<')' if params[:search_any] && params[:search_any].length > 3
	query<< ' AND (\"' << params[:search_exact] <<'\")' if params[:search_exact] && params[:search_exact].length > 3
	query << ' AND NOT (' << params[:search_exclude] <<')' if params[:search_exclude] && params[:search_exclude].length > 3

	valid_params = {
		:search_title => 'title',
		:search_author => 'author_names',
		:search_publisher => 'publisher_name',
		:search_description => 'description',
		:search_tags => 'tags'
	}
	valid_params.each do |key, field|
		query << " AND (title:#{params[key]})" if params[key] && params[key].length > 3
	end
	
    query
end  

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def valid_param?(key)
  params[key] && params[key].length > 3
end

def construct_search_query
  query = '*' 
  
  query << "AND (#{params[:search_all]})" if valid_param?(:search_all)
  query << " AND (#{params[:search_any].split(' ').join('OR')})" if valid_param?(:search_any)
  query << " AND (\"#{params[:search_exact]}\")" if valid_param?(:search_exact)
  query << " AND NOT (#{params[:search_exclude]})" if valid_param?(:search_exclude)
  
  { :search_title => 'title',
    :search_author => 'author_names',
    :search_publisher => 'publisher_name',
    :search_description => 'description',
    :search_tags => 'tags' }.each do |param, field|
    query << " AND (#{field}:#{params[param]})" if valid_param?(param)
  end
  
  query
end  

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def construct_search_query
    search = {
      :search_all => ' AND (%s)',
      :search_any => ' AND (%s)',
      :search_exact => ' AND (\"%s\")',
      :search_exclude => ' AND NOT (%s)'
    }
    valid_params = {
      :search_title => 'title',
      :search_author => 'author_names',
      :search_publisher => 'publisher_name',
      :search_description => 'description',
      :search_tags => 'tags'
    }

    query = '*'
    params = params.reject {|k, v| v.nil? || v.length <= 3}
    params.keys.each do |k|
      if (search[k])
        query << search[k] % params[k]
      else
        query << " AND (%s:%s)"  % [valid_params[k], params[k]] 
      end  
    end 

    query
  end