module ASFJSON

# File lib/whimsy/asf/json-utils.rb, line 12
def self.cmphash(h1, h2, bc=nil, &block)
  bc ||= ['root']
  h1.each do |k, v1|
    v2 = h2[k]
    if !h2.include? k
      yield [bc, 'Dropped', k, v1]
    elsif v1 != v2
      case v1.class.to_s
      when 'Array'
        yield [bc, 'Array', k, [v1, v2]]
      when 'Hash'
        self.cmphash v1, v2, [bc,k].flatten, &block
      else # treat as scalar
        yield [bc, 'Scalar', k, [v1, v2]]
      end
    end
  end
  # Now deal with items not in old (other items have been compared?)
  h2.each do |k,v2|
    v1 = h1[k]
    if v1.nil?
      yield [bc, 'Added', k, v2]
    end
  end
end

# File lib/whimsy/asf/json-utils.rb, line 39
def self.compare_json(old_json, new_json, out=$stdout)
  cmphash old_json, new_json do |bc, type, key, args|
    bcj = bc.join('.')
    case type
    when 'Scalar'
      v1, v2 = args
      out.puts [bcj, key, v1, '=>', v2].inspect
    when 'Array'
      v1, v2 = args
      dropped = v1 - v2
      added = v2 - v1
      if dropped.size == 0
        out.puts  [bcj, key, 'Added', v2-v1].inspect
      elsif added.size == 0
        out.puts  [bcj, key, 'Dropped', v1-v2].inspect
      else
        out.puts  [bcj, key, 'Dropped', v1-v2, 'Added', v2-v1].inspect
      end
    when 'Dropped'
      out.puts  [bcj, 'Dropped', key, args].inspect
    when 'Added'
      out.puts  [bcj, 'Added', key, args].inspect
    else
      raise ArgumentError.new "Unexpected type: #{type} in #{bc} #{key}"
    end
  end
end