# encoding: UTF-8

# Copyright 2012 Twitter, Inc
# http://www.apache.org/licenses/LICENSE-2.0

module TwitterCldr
  module Localized

    class LocalizedDateTime < LocalizedObject
      attr_reader :calendar_type

      def initialize(obj, locale, options = {})
        super
        @calendar_type = options[:calendar_type] || TwitterCldr::DEFAULT_CALENDAR_TYPE
      end

      TwitterCldr::Tokenizers::DateTimeTokenizer::VALID_TYPES.each do |format_type|
        define_method "to_#{format_type}_s" do
          @formatter.format(@base_obj, :type => format_type.to_sym)
        end
      end

      def to_timespan(options = {})
        base_time = options[:base_time] || Time.now
        seconds = (self.to_time.base_obj.to_i - base_time.to_i).abs
        TwitterCldr::Localized::LocalizedTimespan.new(seconds, options.merge(:locale => @locale, :direction => :none))
      end

      def ago(options = {})
        base_time = options[:base_time] || Time.now
        seconds = self.to_time.base_obj.to_i - base_time.to_i
        raise ArgumentError.new('Start date is after end date. Consider using "until" function.') if seconds > 0
        TwitterCldr::Localized::LocalizedTimespan.new(seconds, options.merge(:locale => @locale))
      end

      def until(options = {})
        base_time = options[:base_time] || Time.now
        seconds = self.to_time.base_obj.to_i - base_time.to_i
        raise ArgumentError.new('End date is before start date. Consider using "ago" function.') if seconds < 0
        TwitterCldr::Localized::LocalizedTimespan.new(seconds, options.merge(:locale => @locale))
      end

      def to_s
        to_default_s
      end

      def to_date
        LocalizedDate.new(Date.parse(@base_obj.strftime("%Y-%m-%dT%H:%M:%S%z")), @locale, :calendar_type => @calendar_type)
      end

      def to_time
        LocalizedTime.new(Time.parse(@base_obj.strftime("%Y-%m-%dT%H:%M:%S%z")), @locale, :calendar_type => @calendar_type)
      end

      protected

      def formatter_const
        TwitterCldr::Formatters::DateTimeFormatter
      end
    end

  end
end