class Rails::Generators::GeneratedAttribute

def default
  @default ||= case type
    when :integer                     then 1
    when :float                       then 1.5
    when :decimal                     then "9.99"
    when :datetime, :timestamp, :time then Time.now.to_s(:db)
    when :date                        then Date.today.to_s(:db)
    when :string                      then name == "type" ? "" : "MyString"
    when :text                        then "MyText"
    when :boolean                     then false
    when :references, :belongs_to     then nil
    else
      ""
  end
end

def field_type
  @field_type ||= case type
    when :integer              then :number_field
    when :float, :decimal      then :text_field
    when :time                 then :time_select
    when :datetime, :timestamp then :datetime_select
    when :date                 then :date_select
    when :text                 then :text_area
    when :boolean              then :check_box
    else
      :text_field
  end
end

def has_index?
  @has_index
end

def has_uniq_index?
  @has_uniq_index
end

def human_name
  name.to_s.humanize
end

def index_name
  reference? ? "#{name}_id" : name
end

def initialize(name, type=nil, index_type=false, attr_options={})
  @name           = name
  @type           = (type.presence || :string).to_sym
  @has_index      = %w(index uniq).include?(index_type)
  @has_uniq_index = %w(uniq).include?(index_type)
  @attr_options   = attr_options
end

def inject_index_options
  has_uniq_index? ? ", :unique => true" : ''
end

def inject_options
  "".tap { |s| @attr_options.each { |k,v| s << ", :#{k} => #{v.inspect}" } }
end

def parse(column_definition)
  name, type, has_index = column_definition.split(':')
  # if user provided "name:index" instead of "name:string:index"
  # type should be set blank so GeneratedAttribute's constructor
  # could set it to :string
  has_index, type = type, nil if %w(index uniq).include?(type)
  type, attr_options = *parse_type_and_options(type)
  new(name, type, has_index, attr_options)
end

def parse_type_and_options(type)
  case type
  when /(string|text|binary|integer)\{(\d+)\}/
    return $1, :limit => $2.to_i
  when /decimal\{(\d+)(,|\.|\-)(\d+)\}/
    return :decimal, :precision => $1.to_i, :scale => $3.to_i
  else
    return type, {}
  end
end

def reference?
  self.type.in?([:references, :belongs_to])
end