require 'erubis'

module Flombe
  class Dsl
    CHEF_METHODS   = %w(cookbook_path sandbox_path file_cache_path file_backup_path json_attribs log_level log_location verbose_logging node_name node_path solo ssl_verify_mode umask recipe_url cache_type cache_options)
    BASE_COOKBOOKS = [File.expand_path('../../../cookbooks', __FILE__)]
    FLOMBE_BASE    = "#{ENV['HOME']}/.flombe"
    
    def self.evaluate(flombefile)
      builder = new
      builder.instance_eval(File.open(flombefile, "rb") { |f| f.read }, flombefile.to_s, 1)
      builder
    end
    
    def initialize
      @config  = {}
      @recipes = {}
    end
    
    def config
      cookbooks = @config.delete(:cookbook_path)
      cookbooks = [cookbooks] if cookbooks.kind_of? String
      {
        :file_cache_path  => "#{FLOMBE_BASE}/cache",
        :file_backup_path => "#{FLOMBE_BASE}/backup",
        :sandbox_path     => "#{FLOMBE_BASE}/sandbox",
        :log_level        => :info,
        :log_location     => STDOUT,
        :cookbook_path    => BASE_COOKBOOKS + (cookbooks || []),
        :cache_options    => {:path => "#{FLOMBE_BASE}/cache/checksums", :skip_expires => true}
      }.merge!(@config)
    end
    
    def to_dna
      {
        :recipes => @recipes.keys
      }.merge!(@recipes).to_json
    end
    
    def to_solo_config
      template = File.open(File.expand_path('../../../templates/chef_solo.erb', __FILE__), "r") { |f| f.read }
      Erubis::Eruby.new(template).result(:config => config)
    end
    
    CHEF_METHODS.each do |method|
      define_method method do |*args|
        @config[method.to_sym] = args.pop
      end
    end
    
    def recipe(name, *args)
      options = Hash === args.last ? args.pop : {}
      @recipes[name.to_sym] = options
    end
    
    def rubies(rubies, *args)
      @recipes[:rvm] = {} unless @recipes.has_key?(:rvm)
      
      rubies = [rubies] if rubies.is_a? String
      @recipes[:rvm][:rubies] = rubies
      
      options = Hash === args.last ? args.pop : {}
      @recipes[:rvm][:default_ruby] = options[:default] unless options[:default].nil?
    end
  end
end