# frozen_string_literal: true

require 'spec_helper'

RSpec.describe ISO8601::TimeInterval do
  describe 'pattern initialization' do
    it "should raise a ISO8601::Errors::UnknownPattern if it not a valid interval pattern" do
      # Invalid separators
      expect { ISO8601::TimeInterval.parse('2007-03-01T13:00:00ZP1Y2M10DT2H30M') }
        .to raise_error(ISO8601::Errors::UnknownPattern)
      expect { ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z-P1Y2M10D') }
        .to raise_error(ISO8601::Errors::UnknownPattern)
      expect { ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z~P1Y2M10D') }
        .to raise_error(ISO8601::Errors::UnknownPattern)
      expect { ISO8601::TimeInterval.parse('P1Y2M10DT2H30M2007-03-01T13:00:00Z') }
        .to raise_error(ISO8601::Errors::UnknownPattern)
      expect { ISO8601::TimeInterval.parse('P1Y2M10D-2007-03-01T13:00:00Z') }
        .to raise_error(ISO8601::Errors::UnknownPattern)
      expect { ISO8601::TimeInterval.parse('P1Y2M10D~2007-03-01T13:00:00Z') }
        .to raise_error(ISO8601::Errors::UnknownPattern)
      expect { ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z2008-05-11T15:30:00Z') }
        .to raise_error(ISO8601::Errors::UnknownPattern)
      expect { ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z-2008-05-11T15:30:00Z') }
        .to raise_error(ISO8601::Errors::UnknownPattern)
      expect { ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z~2008-05-11T15:30:00Z') }
        .to raise_error(ISO8601::Errors::UnknownPattern)
    end

    describe 'with duration' do
      it "should raise a ISO8601::Errors::UnknownPattern for any unknown pattern" do
        expect { ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z/') }
          .to raise_error(ISO8601::Errors::UnknownPattern)
        expect { ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z/P') }
          .to raise_error(ISO8601::Errors::UnknownPattern)
        expect { ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z/PT') }
          .to raise_error(ISO8601::Errors::UnknownPattern)
      end
    end

    describe 'with DateTimes' do
      it "should raise a ISO8601::Errors::UnknownPattern for any unknown pattern" do
        expect { ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z/2010-0-09') }
          .to raise_error(ISO8601::Errors::UnknownPattern)
        expect { ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z/2010-05-09T103012+0400') }
          .to raise_error(ISO8601::Errors::UnknownPattern)
        expect { ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z/2014-W15-02T10:11:12Z') }
          .to raise_error(ISO8601::Errors::UnknownPattern)
      end
    end

    it "should raise a ISO8601::Errors::UnknownPattern if start time and end time are durations" do
      expect { ISO8601::TimeInterval.parse('P1Y2M10D/P1Y2M10D') }.to raise_error(ISO8601::Errors::UnknownPattern)
      expect { ISO8601::TimeInterval.parse('P1Y0.5M/P1Y0.5M') }.to raise_error(ISO8601::Errors::UnknownPattern)
    end

    context "allowed patterns" do
      it "should parse <start>/<duration>" do
        expect { ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z/P1Y') }.to_not raise_error
        expect { ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z/P1Y1M1D') }.to_not raise_error
        expect { ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z/P1Y1M1DT1H1M1.0S') }.to_not raise_error
        expect { ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z/P1Y1M1DT1H1M1,0S') }.to_not raise_error
      end

      it "should parse <duration>/<end>" do
        expect { ISO8601::TimeInterval.parse('P1Y1M1D/2010-05-09T10:30:12+04:00') }.to_not raise_error
        expect { ISO8601::TimeInterval.parse('P1Y1M1DT1H/-2014-05-31T16:26:00Z') }.to_not raise_error
        expect { ISO8601::TimeInterval.parse('P1Y1M1DT0.5H/2014-05-31T16:26:10.5Z') }.to_not raise_error
        expect { ISO8601::TimeInterval.parse('P1Y1M1DT0,5H/2014-05-31T16:26:10,5Z') }.to_not raise_error
      end

      it "should parse <start>/<end>" do
        expect { ISO8601::TimeInterval.parse('2014-001/2010-05-09T10:30') }.to_not raise_error
        expect { ISO8601::TimeInterval.parse('2014121/2010-05-09T10:30:12') }.to_not raise_error
        expect { ISO8601::TimeInterval.parse('2014-121T10:11:12Z/2010-05-09T10:30:12Z') }.to_not raise_error
        expect { ISO8601::TimeInterval.parse('20100509T103012+0400/2010-05-09T10:30:12+04') }.to_not raise_error
        expect { ISO8601::TimeInterval.parse('20100509/2010-05-09T10:30:12+04:00') }.to_not raise_error
        expect { ISO8601::TimeInterval.parse('T103012+0400/2010-05-09T10:30:12-04:00') }.to_not raise_error
        expect { ISO8601::TimeInterval.parse('T103012+04/2010-05-09T10:30:12-00:00') }.to_not raise_error
      end
    end
  end

  describe 'initialization with a ISO8601::Duration' do
    # it "should raise a ISO8601::Errors::TypeError if parameter is not a ISO8601::Duration" do
    #   datetime = ISO8601::DateTime.new('2010-05-09T10:30:12Z')

    #   expect { ISO8601::TimeInterval.from_duration('hi', {}) }.to raise_error(ISO8601::Errors::TypeError)
    #   expect { ISO8601::TimeInterval.from_duration([], {}) }.to raise_error(ISO8601::Errors::TypeError)
    #   expect { ISO8601::TimeInterval.from_duration(datetime, {}) }.to raise_error(ISO8601::Errors::TypeError)
    #   expect { ISO8601::TimeInterval.from_duration({}, {}) }.to raise_error(ISO8601::Errors::TypeError)
    # end

    # it "should raise an ISO8601::Errors::TypeError if the time hash is no valid" do
    #   duration = ISO8601::Duration.new('P1Y1M1DT0.5H')
    #   datetime = ISO8601::DateTime.new('2010-05-09T10:30:12Z')

    #   expect { ISO8601::TimeInterval.from_duration(duration, { time: datetime }) }.to raise_error(ISO8601::Errors::TypeError)
    #   expect { ISO8601::TimeInterval.from_duration(duration, { start_time: nil }) }.to raise_error(ISO8601::Errors::TypeError)
    #   expect { ISO8601::TimeInterval.from_duration(duration, { start_time: datetime, end_time: datetime }) }.to raise_error(ISO8601::Errors::TypeError)
    #   expect { ISO8601::TimeInterval.from_duration(duration, {}) }.to raise_error(ISO8601::Errors::TypeError)
    # end

    it "should initialize with a valid duration and time" do
      time = ISO8601::DateTime.new('2010-05-09T10:30:12Z')
      duration = ISO8601::Duration.new('P1M')

      expect { ISO8601::TimeInterval.from_duration(time, duration) }.to_not raise_error
      expect { ISO8601::TimeInterval.from_duration(duration, time) }.to_not raise_error
    end
  end

  describe 'initialization with a ISO8601::DateTime' do
    it "should raise a ISO8601::Errors::TypeError if parameters are not an ISO8601::DateTime instance" do
      duration = ISO8601::Duration.new('P1Y1M1DT0.5H')
      datetime = ISO8601::DateTime.new('2010-05-09T10:30:12Z')

      expect { ISO8601::TimeInterval.from_datetimes(duration, datetime) }.to raise_error(ISO8601::Errors::TypeError)
      expect { ISO8601::TimeInterval.from_datetimes(datetime, duration) }.to raise_error(ISO8601::Errors::TypeError)
      expect { ISO8601::TimeInterval.from_datetimes(datetime, 'Hello!') }.to raise_error(ISO8601::Errors::TypeError)
      expect { ISO8601::TimeInterval.from_datetimes({}, datetime) }.to raise_error(ISO8601::Errors::TypeError)
    end

    it "should initialize class with a valid datetimes" do
      datetime = ISO8601::DateTime.new('2010-05-09T10:30:12Z')
      datetime2 = ISO8601::DateTime.new('2010-05-15T10:30:12Z')

      expect { ISO8601::TimeInterval.from_datetimes(datetime, datetime2) }.to_not raise_error
      expect { ISO8601::TimeInterval.from_datetimes(datetime2, datetime) }.to_not raise_error
    end
  end

  describe "#to_f" do
    it "should calculate the size of time interval <start>/<end>" do
      hour = (60 * 60).to_f
      pattern1 = '2010-05-09T11:30:00Z/2010-05-09T12:30:00Z'
      pattern2 = '2010-05-09T11:30:00+01:00/2010-05-09T12:30:00+01:00'

      expect(ISO8601::TimeInterval.parse(pattern1).to_f).to eq(hour)
      expect(ISO8601::TimeInterval.parse(pattern2).to_f).to eq(hour)
    end

    it "should calculate the size of time interval <start>/<duration>" do
      hour = (60 * 60).to_f
      pattern1 = '2010-05-09T11:30:00Z/PT1H'
      pattern2 = '2010-05-09T11:30:00+01:00/PT1H'

      expect(ISO8601::TimeInterval.parse(pattern1).to_f).to eq(hour)
      expect(ISO8601::TimeInterval.parse(pattern2).to_f).to eq(hour)
    end

    it "should calculate the size of time interval <duration>/<end>" do
      hour = (60 * 60).to_f
      pattern1 = 'PT1H/2010-05-09T11:30:00Z'
      pattern2 = 'PT1H/2010-05-09T11:30:00-09:00'

      expect(ISO8601::TimeInterval.parse(pattern1).to_f).to eq(hour)
      expect(ISO8601::TimeInterval.parse(pattern2).to_f).to eq(hour)
    end
    it "should be 0" do
      expect(ISO8601::TimeInterval.parse('2015-01-01/2015-01-01').to_f).to eq(0)
    end
  end

  describe "#empty?" do
    it "should check if the interval is empty" do
      expect(ISO8601::TimeInterval.parse('2015-01-01/2015-01-01').empty?).to be_truthy
      expect(ISO8601::TimeInterval.parse('2015-01-01/2015-01-02').empty?).to be_falsy
    end
  end

  describe "#start_time" do
    it "should return always a ISO8601::DateTime object" do
      pattern = 'PT1H/2010-05-09T10:30:00Z'
      pattern2 = '2010-05-09T11:30:00Z/PT1H'
      pattern3 = '2010-05-09T11:30:00Z/2010-05-09T12:30:00Z'

      expect(ISO8601::TimeInterval.parse(pattern).first).to be_an_instance_of(ISO8601::DateTime)
      expect(ISO8601::TimeInterval.parse(pattern2).first).to be_an_instance_of(ISO8601::DateTime)
      expect(ISO8601::TimeInterval.parse(pattern3).first).to be_an_instance_of(ISO8601::DateTime)
    end

    it "should calculate correctly the start_time" do
      start_time = ISO8601::DateTime.new('2010-05-09T10:30:00Z')
      pattern = 'PT1H/2010-05-09T11:30:00Z'
      pattern2 = '2010-05-09T10:30:00Z/PT1H'
      pattern3 = '2010-05-09T10:30:00Z/2010-05-09T12:30:00Z'

      expect(ISO8601::TimeInterval.parse(pattern).first).to eq(start_time)
      expect(ISO8601::TimeInterval.parse(pattern2).first).to eq(start_time)
      expect(ISO8601::TimeInterval.parse(pattern3).first).to eq(start_time)
    end

    describe "November" do
      pairs = [
        { pattern: 'P1Y/2017-11-09T07:00:00Z',
          start_time: ISO8601::DateTime.new('2016-11-09T07:00:00Z') },
        { pattern: 'P1M/2017-11-09T07:00:00Z',
          start_time: ISO8601::DateTime.new('2017-10-09T07:00:00Z') },
        { pattern: 'P1D/2017-11-09T07:00:00Z',
          start_time: ISO8601::DateTime.new('2017-11-08T07:00:00Z') },
        { pattern: 'PT1H/2017-11-09T07:00:00Z',
          start_time: ISO8601::DateTime.new('2017-11-09T06:00:00Z') }
      ]

      pairs.each do |pair|
        it "should calculate correctly the start_time for #{pair[:pattern]}" do
          expect(ISO8601::TimeInterval.parse(pair[:pattern]).first.to_s).to eq(pair[:start_time].to_s)
        end
      end
    end

    describe "December" do
      pairs = [
        { pattern: 'P1Y/2017-12-09T07:00:00Z',
          start_time: ISO8601::DateTime.new('2016-12-09T07:00:00Z') },
        { pattern: 'P1M/2017-12-09T07:00:00Z',
          start_time: ISO8601::DateTime.new('2017-11-09T07:00:00Z') },
        { pattern: 'P3D/2017-12-06T18:30:00Z',
          start_time: ISO8601::DateTime.new('2017-12-03T18:30:00Z') },
        { pattern: 'P1D/2017-12-09T07:00:00Z',
          start_time: ISO8601::DateTime.new('2017-12-08T07:00:00Z') },
        { pattern: 'PT1H/2017-12-09T07:00:00Z',
          start_time: ISO8601::DateTime.new('2017-12-09T06:00:00Z') }
      ]

      pairs.each do |pair|
        it "should calculate correctly the start_time for #{pair[:pattern]}" do
          expect(ISO8601::TimeInterval.parse(pair[:pattern]).first.to_s).to eq(pair[:start_time].to_s)
        end
      end
    end

    describe "January" do
      pairs = [
        { pattern: 'P1Y/2017-01-01T00:00:00Z',
          start_time: ISO8601::DateTime.new('2016-01-01T00:00:00Z') },
        { pattern: 'P1M/2017-01-01T00:00:00Z',
          start_time: ISO8601::DateTime.new('2016-12-01T00:00:00Z') },
        { pattern: 'P1D/2017-01-01T00:00:00Z',
          start_time: ISO8601::DateTime.new('2016-12-31T00:00:00Z') },
        { pattern: 'PT1H/2017-01-01T01:00:00Z',
          start_time: ISO8601::DateTime.new('2017-01-01T00:00:00Z') }
      ]

      pairs.each do |pair|
        it "should calculate correctly the start_time for #{pair[:pattern]}" do
          expect(ISO8601::TimeInterval.parse(pair[:pattern]).first.to_s).to eq(pair[:start_time].to_s)
        end
      end
    end

    describe "February" do
      pairs = [
        { pattern: 'P1Y/2017-02-01T00:00:00Z',
          start_time: ISO8601::DateTime.new('2016-02-01T00:00:00Z') },
        { pattern: 'P1M/2017-02-01T00:00:00Z',
          start_time: ISO8601::DateTime.new('2017-01-01T00:00:00Z') },
        { pattern: 'P1D/2017-02-01T00:00:00Z',
          start_time: ISO8601::DateTime.new('2017-01-31T00:00:00Z') },
        { pattern: 'PT1H/2017-02-01T01:00:00Z',
          start_time: ISO8601::DateTime.new('2017-02-01T00:00:00Z') }
      ]

      pairs.each do |pair|
        it "should calculate correctly the start_time for #{pair[:pattern]}" do
          expect(ISO8601::TimeInterval.parse(pair[:pattern]).first.to_s).to eq(pair[:start_time].to_s)
        end
      end
    end

    describe "March" do
      pairs = [
        { pattern: 'P1Y/2017-03-01T00:00:00Z',
          start_time: ISO8601::DateTime.new('2016-03-01T00:00:00Z') },
        { pattern: 'P1M/2017-03-01T00:00:00Z',
          start_time: ISO8601::DateTime.new('2017-02-01T00:00:00Z') },
        { pattern: 'P1D/2017-03-01T00:00:00Z',
          start_time: ISO8601::DateTime.new('2017-02-28T00:00:00Z') },
        { pattern: 'PT1H/2017-03-01T01:00:00Z',
          start_time: ISO8601::DateTime.new('2017-03-01T00:00:00Z') }
      ]

      pairs.each do |pair|
        it "should calculate correctly the start_time for #{pair[:pattern]}" do
          expect(ISO8601::TimeInterval.parse(pair[:pattern]).first.to_s).to eq(pair[:start_time].to_s)
        end
      end
    end
  end

  describe "#last" do
    it "should return always a ISO8601::DateTime object" do
      pattern = 'PT1H/2010-05-09T10:30:00Z'
      pattern2 = '2010-05-09T11:30:00Z/PT1H'
      pattern3 = '2010-05-09T11:30:00Z/2010-05-09T12:30:00Z'

      expect(ISO8601::TimeInterval.parse(pattern).last).to be_an_instance_of(ISO8601::DateTime)
      expect(ISO8601::TimeInterval.parse(pattern2).last).to be_an_instance_of(ISO8601::DateTime)
      expect(ISO8601::TimeInterval.parse(pattern3).last).to be_an_instance_of(ISO8601::DateTime)
    end

    it "should calculate correctly the last datetime" do
      end_time = ISO8601::DateTime.new('2010-05-09T10:30:00Z')
      pattern = 'PT1H/2010-05-09T10:30:00Z'
      pattern2 = '2010-05-09T09:30:00Z/PT1H'
      pattern3 = '2010-05-09T09:30:00Z/2010-05-09T10:30:00Z'

      expect(ISO8601::TimeInterval.parse(pattern).last).to eq(end_time)
      expect(ISO8601::TimeInterval.parse(pattern2).last).to eq(end_time)
      expect(ISO8601::TimeInterval.parse(pattern3).last).to eq(end_time)
    end
  end

  describe "#to_s" do
    it "should return the pattern if TimeInterval is initialized with a pattern" do
      pattern = 'P1Y1M1DT0,5S/2014-05-31T16:26:10Z'
      pattern2 = '2007-03-01T13:00:00Z/P1Y'

      expect(ISO8601::TimeInterval.parse(pattern).to_s).to eq(pattern)
      expect(ISO8601::TimeInterval.parse(pattern2).to_s).to eq(pattern2)
    end

    it "should build the pattern and return if TimeInterval is initialized with objects" do
      duration = ISO8601::Duration.new('P1Y1M1DT0.5H')
      datetime = ISO8601::DateTime.new('2010-05-09T10:30:12+00:00')
      datetime2 = ISO8601::DateTime.new('2010-05-15T10:30:12+00:00')

      expect(ISO8601::TimeInterval.from_duration(duration, datetime).to_s).to eq('P1Y1M1DT0.5H/2010-05-09T10:30:12+00:00')
      expect(ISO8601::TimeInterval.from_duration(datetime, duration).to_s).to eq('2010-05-09T10:30:12+00:00/P1Y1M1DT0.5H')
      expect(ISO8601::TimeInterval.from_datetimes(datetime, datetime2).to_s).to eq('2010-05-09T10:30:12+00:00/2010-05-15T10:30:12+00:00')
    end
  end

  describe "compare Time Intervals" do
    before(:each) do
      @small = ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z/PT1H')
      @big = ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z/PT2H')
    end

    it "should raise TypeError when compared object is not a ISO8601::TimeInterval" do
      expect { @small < 'Hello!' }.to raise_error(ArgumentError)
      expect { @small > 'Hello!' }.to raise_error(ArgumentError)
    end

    it "should check what interval is bigger" do
      expect(@small <=> @big).to eq(-1)
      expect(@big <=> @small).to eq(1)
      expect(@big <=> @big).to eq(0)

      expect(@small > @big).to be_falsy
      expect(@big > @small).to be_truthy
      expect(@small > @small).to be_falsy
    end

    it "should check if interval is bigger or equal than other" do
      expect(@small >= @big).to be_falsy
      expect(@big >= @small).to be_truthy
      expect(@small >= @small).to be_truthy
    end

    it "should check what interval is smaller" do
      expect(@small < @big).to be_truthy
      expect(@big < @small).to be_falsy
      expect(@small < @small).to be_falsy
    end

    it "should check if interval is smaller or equal than other" do
      expect(@small <= @big).to be_truthy
      expect(@big <= @small).to be_falsy
      expect(@small <= @small).to be_truthy
    end

    it "should check if the intervals are equals" do
      expect(@small == @small).to be_truthy
      expect(@small == @small.to_f).to be_falsy
      expect(@small == @big).to be_falsy
      expect(@small == @big.to_f).to be_falsy
    end
  end

  describe "#eql?" do
    it "should be equal only when start_time and end_time are the same" do
      interval = ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z/PT1H')
      interval2 = ISO8601::TimeInterval.parse('2007-03-01T14:00:00Z/PT1H')
      interval3 = ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z/PT1H')

      expect(interval.eql?(interval2)).to be_falsy
      expect(interval.eql?(interval3)).to be_truthy
    end
  end

  describe "#include?" do
    it "raise TypeError when the parameter is not valid" do
      ti = ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z/PT1H')
      expect { ti.include?('hola') }.to raise_error(ISO8601::Errors::TypeError)
      expect { ti.include?(123) }.to raise_error(ISO8601::Errors::TypeError)
      expect { ti.include?(ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z/PT1H')) }.to raise_error(ISO8601::Errors::TypeError)
    end

    it "should check if a DateTime is included" do
      ti = ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z/P1DT1H')
      included = DateTime.new(2007, 3, 1, 15, 0, 0)
      included_iso8601 = ISO8601::DateTime.new('2007-03-01T18:00:00Z')
      not_included = DateTime.new(2007, 2, 1, 15, 0, 0)
      not_included_iso8601 = ISO8601::DateTime.new('2007-03-01T11:00:00Z')

      expect(ti.include?(included)).to be_truthy
      expect(ti.include?(included_iso8601)).to be_truthy
      expect(ti.include?(not_included)).to be_falsy
      expect(ti.include?(not_included_iso8601)).to be_falsy
    end
  end

  describe "#subset?" do
    it "raise TypeError when the parameter is not valid" do
      ti = ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z/PT1H')
      dt = ISO8601::DateTime.new('2007-03-01T18:00:00Z')

      expect { ti.subset?('2007-03-01T18:00:00Z') }.to raise_error(ISO8601::Errors::TypeError)
      expect { ti.subset?(123) }.to raise_error(ISO8601::Errors::TypeError)
      expect { ti.subset?(dt) }.to raise_error(ISO8601::Errors::TypeError)
    end

    it "should check if an interval is subset of another one" do
      ti = ISO8601::TimeInterval.parse('2015-01-15T00:00:00Z/P1D')
      ti2 = ISO8601::TimeInterval.parse('2015-01-01T00:00:00Z/P1M')

      expect(ti.subset?(ti)).to be_truthy
      expect(ti.subset?(ti2)).to be_truthy
      expect(ti2.subset?(ti)).to be_falsy
    end
  end

  describe "#superset?" do
    it "raise TypeError when the parameter is not valid" do
      ti = ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z/PT1H')
      dt = ISO8601::DateTime.new('2007-03-01T18:00:00Z')

      expect { ti.superset?('2007-03-01T18:00:00Z') }.to raise_error(ISO8601::Errors::TypeError)
      expect { ti.superset?(123) }.to raise_error(ISO8601::Errors::TypeError)
      expect { ti.superset?(dt) }.to raise_error(ISO8601::Errors::TypeError)
    end

    it "should check if the interval is superset of the given one" do
      ti = ISO8601::TimeInterval.parse('2015-01-01T00:00:00Z/P1M')
      ti2 = ISO8601::TimeInterval.parse('2015-01-15T00:00:00Z/P1D')
      ti3 = ISO8601::TimeInterval.parse('2015-03-01T00:00:00Z/P1D')

      expect(ti.superset?(ti)).to be_truthy
      expect(ti.superset?(ti2)).to be_truthy
      expect(ti.superset?(ti3)).to be_falsy
    end
  end

  describe "#intersect?" do
    it "raise TypeError when the parameter is not valid" do
      ti = ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z/PT1H')
      dt = DateTime.new(2007, 2, 1, 15, 0, 0)
      dt_iso8601 = ISO8601::DateTime.new('2007-03-01T18:00:00Z')

      expect { ti.intersect?('hola') }.to raise_error(ISO8601::Errors::TypeError)
      expect { ti.intersect?(123) }.to raise_error(ISO8601::Errors::TypeError)
      expect { ti.intersect?(dt) }.to raise_error(ISO8601::Errors::TypeError)
      expect { ti.intersect?(dt_iso8601) }.to raise_error(ISO8601::Errors::TypeError)
    end

    it "should check if two intervals intersect" do
      ti = ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z/P1DT1H')
      included = ISO8601::TimeInterval.parse('2007-03-01T14:00:00Z/PT2H')
      overlaped = ISO8601::TimeInterval.parse('2007-03-01T18:00:00Z/P1DT1H')
      not_overlaped = ISO8601::TimeInterval.parse('2007-03-14T14:00:00Z/PT2H')

      expect(ti.intersect?(included)).to be_truthy
      expect(ti.intersect?(overlaped)).to be_truthy
      expect(ti.intersect?(not_overlaped)).to be_falsy
    end
  end

  describe "#intersection" do
    let(:small) { ISO8601::TimeInterval.parse('2015-06-15/P1D') }
    let(:big) { ISO8601::TimeInterval.parse('2015-06-01/P1M') }
    let(:other) { ISO8601::TimeInterval.parse('2015-06-30/P1D') }

    it "raise TypeError when the parameter is not valid" do
      ti = ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z/PT1H')
      dt = ISO8601::DateTime.new('2007-03-01T18:00:00Z')

      expect { ti.intersection('2007-03-01T13:00:00Z/PT1H') }.to raise_error(ISO8601::Errors::TypeError)
      expect { ti.intersection(1) }.to raise_error(ISO8601::Errors::TypeError)
      expect { ti.intersection(dt) }.to raise_error(ISO8601::Errors::TypeError)
    end

    it "raise IntervalError when the intervals are disjoint" do
      expect { small.intersection(other) }.to raise_error(ISO8601::Errors::IntervalError)
    end

    it "should return the smallest when one is subset of the other" do
      expect(small.intersection(small)).to eq(small)
      expect(big.intersection(small)).to eq(small)
      expect(small.intersection(big)).to eq(small)
    end
  end

  describe "#disjoint?" do
    it "raise TypeError when the parameter is not valid" do
      ti = ISO8601::TimeInterval.parse('2007-03-01T13:00:00Z/PT1H')
      dt = ISO8601::DateTime.new('2007-03-01T18:00:00Z')

      expect { ti.disjoint?('2007-03-01T13:00:00Z/PT1H') }.to raise_error(ISO8601::Errors::TypeError)
      expect { ti.disjoint?(1) }.to raise_error(ISO8601::Errors::TypeError)
      expect { ti.disjoint?(dt) }.to raise_error(ISO8601::Errors::TypeError)
    end

    it "should check if two intervals are disjoint" do
      ti = ISO8601::TimeInterval.parse('2015-01-01T00:00:00Z/P1D')
      ti2 = ISO8601::TimeInterval.parse('2015-02-01T00:00:00Z/P1D')

      expect(ti.disjoint?(ti)).to be_falsy
      expect(ti.disjoint?(ti2)).to be_truthy
    end
  end
end