# encoding: UTF-8
#
# Copyright 2010 Dan Wanek <dan.wanek@gmail.com>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# rubocop:disable Metrics/MethodLength
# rubocop:disable Metrics/AbcSize

# Format an ISO8601 Duration
module Iso8601Duration
  # Convert the number of seconds to an ISO8601 duration format
  # @see http://tools.ietf.org/html/rfc2445#section-4.3.6
  # @param [Fixnum] seconds The amount of seconds for this duration
  def self.sec_to_dur(seconds)
    seconds = seconds.to_i
    iso_str = 'P'
    if seconds > 604_800 # more than a week
      weeks = seconds / 604_800
      seconds -= (604_800 * weeks)
      iso_str << "#{weeks}W"
    end
    if seconds > 86_400 # more than a day
      days = seconds / 86_400
      seconds -= (86_400 * days)
      iso_str << "#{days}D"
    end
    if seconds > 0
      iso_str << 'T'
      if seconds > 3600 # more than an hour
        hours = seconds / 3600
        seconds -= (3600 * hours)
        iso_str << "#{hours}H"
      end
      if seconds > 60 # more than a minute
        minutes = seconds / 60
        seconds -= (60 * minutes)
        iso_str << "#{minutes}M"
      end
      iso_str << "#{seconds}S"
    end

    iso_str
  end
end

# rubocop:enable Metrics/MethodLength
# rubocop:enable Metrics/AbcSize