# Asserts a given file exists. You need to supply an absolute path or a path relative
# to the configured destination:
#
#   generator.should have_generated_file "app/controller/products_controller.rb" 
#            

module RSpec::FileMatchers
  class GenerateFile

    def initialize(relative_path, type = nil)
      @relative_path = relative_rails_file relative_path, type
    end

    def matches?(generator, &block)              
      @expected = File.expand_path(@relative_path, generator.class.destination_root)
      ex = File.exists?(@expected)
      if block && ex
        read = File.read(@expected)
        ruby_content = read.extend(RSpec::RubyContent::Helpers)
        yield ruby_content
      else
        ex
      end        
    end          
  
    def failure_message
      "Expected file #{@relative_path} to have been generated, but it was not"
    end

    def negative_failure_message
      "Did not expected file #{@relative_path} to have been generated, but it was"
    end
    
    protected
    
    def relative_rails_file path, type = nil                             
      return File.join(::Rails.root, base_dir(type), folder(type), "#{path.to_s}.rb") if type        
      File.join(::Rails.root, path)
    end

    def folder type
      case type
      when :observer
        'models'
      else
        type.to_s.pluralize
      end
    end      
    
    def base_dir type
      case type
      when :model, :controller, :view, :helper, :observer
        'app'
      when :migration
        'db'
      when :javascript, :stylesheet
        'public'
      when :initializer, :locale
        'config'
      else
        ''          
      end
    end
  end

  def generate_file(relative, type = nil)
    GenerateFile.new(relative, type)
  end
  alias_method :generate_directory, :generate_file
end