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require 'rubygems'
require 'date'
require 'time'
require 'spec'

class Date
  def self.iso8601(a_string)
    # 5  -- +YYYY
    
    # 7  -- YYYY-MM
    # 7  -- YYYYWww
    # 7  -- YYYYDDD
    
    # 8  -- YYYYMMDD
    # 8  -- YYYY-Www
    # 8  -- YYYYWwwD
    # 8  -- YYYY-DDD
    
    # 10 -- YYYY-Www-D
    # 10 -- YYYY-MM-DD
    
    case a_string.length
    when 5
      
      if a_string =~ /^([\+-]\d{4})$/
        Date.new($1.to_i)
      else
        nil
      end
      
    when 7
      if a_string =~ /(\d{4})-(\d{2})/ # YYYY-MM
        Date.new($1.to_i, $2.to_i)
      elsif a_string =~ /\d{4}W\d{2}/ # YYYYWww
        Date.new($1.to_i, 0, $2.to_i*7)
      elsif a_string =~ /\d{4}\d{3}/ # YYYYDDD
        Date.new($1.to_i, 0, $2.to_i)
      end
      
    when 8
      
    when 10
      
    end
  end
end

class Time
  def self.iso8601(a_string)
    nil
  end
end

context 'ISO 8601 Dates' do
  specify 'should parse +YYYY' do
    date = Date.iso8601('+2007')
    date.year.should == 2007
    
    date = Date.iso8601('-0500')
    date.year.should == -500
  end
  
  specify 'should parse YYYY-MM-DD' do
    date = Date.iso8601('2006-12-18')
    date.year.should == 2006
    date.month.should == 12
    date.day.should == 18
  end
  
  specify 'should parse YYYY-MM' do
    date = Date.iso8601('2006-12')
    date.year.should == 2006
    date.month.should == 12
  end
  
  specify 'should parse YYYYMMDD' do
    date = Date.iso8601('20061218')
    date.year.should == 2006
    date.month.should == 12
  end
  
  specify 'should parse YYYY-Www' do
  end
  
  specify 'should parse YYYYWww' do
  end
  
  specify 'should parse YYYY-Www-D' do
  end
  
  specify 'should parse YYYYWwwD' do
  end
  
  specify 'should parse YYYY-DDD' do
  end
  
  specify 'should parse YYYYDDD' do
  end
end

context 'ISO 8601 Times' do
  specify 'should parse hh:mm:ss' do
  end
  
  specify 'should parse hhmmss' do
  end
  
  specify 'should parse hh:mm' do
  end
  
  specify 'should parse hhmm' do
  end
  
  specify 'should parse hh' do
  end
  
  specify 'should parse <time>Z' do
  end
  
  specify 'should parse <time>±hh:mm:ss' do
  end
  
  specify 'should parse <time>±hhmmss' do
  end
  
  specify 'should parse <time>±hh:mm' do
  end
  
  specify 'should parse <time>±hhmm' do
  end
  
  specify 'should parse <time>±hh' do
  end
end

context 'ISO 8601 Date/Times' do
  specify 'should parse <date>T<time>' do
  end
end