module Gorgyrella
  class Builder
    attr_reader :sections
  
    def initialize
      @anonymous_section_index = 0
      @line = 1
    
      @sections = []
      append_section()
    end
    
    def section(name)
      selected_sections = sections.find_all {|s| s[:section] == name}
      raise "section #{name} not found!" if selected_sections.size == 0
      raise "section #{name} not unique!" if selected_sections.size > 1
      selected_sections.first
    end
    
    def append_line(text)
      @sections.last[:lines] << [@line, text]
      @line += 1
    end
  
    def lines_for(section_name)
      section(section_name)[:lines]
    end
    
    def next_anonymous_section
      (@anonymous_section_index += 1).to_s
    end
  
    def append_section(params = {})
      command = params[:command] || 'export'
      section = params[:section] || next_anonymous_section
    
      new_section = {
        :command => command, 
        :section => section, 
        :file => params[:file], 
        :format => params[:format],
        :language => params[:language],
        :lines => []
      }

      @sections << new_section
    end
  end
end