# Copyright (c) 2009-2010, PalominoDB, Inc.
# All rights reserved.
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# 
#   * Redistributions of source code must retain the above copyright notice,
#     this list of conditions and the following disclaimer.
# 
#   * Redistributions in binary form must reproduce the above copyright notice,
#     this list of conditions and the following disclaimer in the documentation
#     and/or other materials provided with the distribution.
# 
#   * Neither the name of PalominoDB, Inc. nor the names of its contributors
#     may be used to endorse or promote products derived from this software
#     without specific prior written permission.
# 
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# POSSIBILITY OF SUCH DAMAGE.
require 'active_support'
module TTT
  class AppConfigError < NameError ; end
  class AppConfig
    attr_reader :section

#    protected
    class_inheritable_accessor :top

    public
    def initialize(hsh, section=nil)
      @section = section
      @values=hsh
      @top = hsh if(section.nil?)
    end

    def [](x)
      if @values[x].class == Hash
        AppConfig.new(@values[x], x)
      else
        @values[x]
      end
    end

    def need_section(s)
      unless @values.key? s and @values[s].class == Hash
        raise AppConfigError, "Missing required section: #{s}"
      end
      self[s]
    end

    def need_option(key)
      unless @values.key? key
        raise AppConfigError, "Missing required option: #{section}.#{key}"
      end
      @values[key]
    end

    def want_option(key, default=nil)
      unless @values[key]
        default
      else
        @values[key]
      end
    end

    def inspect
      "AppConfig<#{section ? section + ": " : ""}#{@values.keys.join(', ')}>"
    end
  end
end
