require 'time'
require 'date'

# Parse natural language dates and times into Time or {Chronic::Span} objects
#
# @example
#   require 'chronic'
#
#   Time.now   #=> Sun Aug 27 23:18:25 PDT 2006
#
#   Chronic.parse('tomorrow')
#     #=> Mon Aug 28 12:00:00 PDT 2006
#
#   Chronic.parse('monday', :context => :past)
#     #=> Mon Aug 21 12:00:00 PDT 2006
#
#   Chronic.parse('this tuesday 5:00')
#     #=> Tue Aug 29 17:00:00 PDT 2006
#
#   Chronic.parse('this tuesday 5:00', :ambiguous_time_range => :none)
#     #=> Tue Aug 29 05:00:00 PDT 2006
#
#   Chronic.parse('may 27th', :now => Time.local(2000, 1, 1))
#     #=> Sat May 27 12:00:00 PDT 2000
#
#   Chronic.parse('may 27th', :guess => false)
#     #=> Sun May 27 00:00:00 PDT 2007..Mon May 28 00:00:00 PDT 2007
#
# @author Tom Preston-Werner, Lee Jarvis
module Chronic
  VERSION = "0.5.0"

  class << self

    # @return [Boolean] true when debug mode is enabled
    attr_accessor :debug

    # @example
    #   require 'chronic'
    #   require 'active_support/time'
    #
    #   Time.zone = 'UTC'
    #   Chronic.time_class = Time.zone
    #   Chronic.parse('June 15 2006 at 5:54 AM')
    #     # => Thu, 15 Jun 2006 05:45:00 UTC +00:00
    #
    # @return [Time] The time class Chronic uses internally
    attr_accessor :time_class

    # The current Time Chronic is using to base from
    #
    # @example
    #   Time.now #=> 2011-06-06 14:13:43 +0100
    #   Chronic.parse('yesterday') #=> 2011-06-05 12:00:00 +0100
    #
    #   now = Time.local(2025, 12, 24)
    #   Chronic.parse('tomorrow', :now => now) #=> 2025-12-25 12:00:00 +0000
    #
    # @return [Time, nil]
    attr_accessor :now
  end

  self.debug = false
  self.time_class = Time
end

require 'chronic/chronic'
require 'chronic/handlers'
require 'chronic/mini_date'
require 'chronic/tag'
require 'chronic/span'
require 'chronic/token'
require 'chronic/grabber'
require 'chronic/pointer'
require 'chronic/scalar'
require 'chronic/ordinal'
require 'chronic/separator'
require 'chronic/time_zone'
require 'chronic/numerizer'
require 'chronic/season'

require 'chronic/repeater'
require 'chronic/repeaters/repeater_year'
require 'chronic/repeaters/repeater_season'
require 'chronic/repeaters/repeater_season_name'
require 'chronic/repeaters/repeater_month'
require 'chronic/repeaters/repeater_month_name'
require 'chronic/repeaters/repeater_fortnight'
require 'chronic/repeaters/repeater_week'
require 'chronic/repeaters/repeater_weekend'
require 'chronic/repeaters/repeater_weekday'
require 'chronic/repeaters/repeater_day'
require 'chronic/repeaters/repeater_day_name'
require 'chronic/repeaters/repeater_day_portion'
require 'chronic/repeaters/repeater_hour'
require 'chronic/repeaters/repeater_minute'
require 'chronic/repeaters/repeater_second'
require 'chronic/repeaters/repeater_time'

class Time
  def self.construct(year, month = 1, day = 1, hour = 0, minute = 0, second = 0)
    if second >= 60
      minute += second / 60
      second = second % 60
    end

    if minute >= 60
      hour += minute / 60
      minute = minute % 60
    end

    if hour >= 24
      day += hour / 24
      hour = hour % 24
    end

    # determine if there is a day overflow. this is complicated by our crappy calendar
    # system (non-constant number of days per month)
    day <= 56 || raise("day must be no more than 56 (makes month resolution easier)")
    if day > 28
      # no month ever has fewer than 28 days, so only do this if necessary
      leap_year_month_days = [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
      common_year_month_days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
      days_this_month = Date.leap?(year) ? leap_year_month_days[month - 1] : common_year_month_days[month - 1]
      if day > days_this_month
        month += day / days_this_month
        day = day % days_this_month
      end
    end

    if month > 12
      if month % 12 == 0
        year += (month - 12) / 12
        month = 12
      else
        year += month / 12
        month = month % 12
      end
    end

    Chronic.time_class.local(year, month, day, hour, minute, second)
  end

  def to_minidate
    Chronic::MiniDate.new(self.month, self.day)
  end
end