#-- encoding: UTF-8

#-- copyright
# OpenProject is an open source project management software.
# Copyright (C) 2012-2020 the OpenProject GmbH
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License version 3.
#
# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
# Copyright (C) 2006-2017 Jean-Philippe Lang
# Copyright (C) 2010-2013 the ChiliProject Team
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
#
# See docs/COPYRIGHT.rdoc for more details.
#++

require 'spec_helper'

describe NotifyJournalCompletedJob, type: :model do
  let(:project) { FactoryBot.create(:project) }
  let(:permissions) { [:view_work_packages] }
  let(:recipient) do
    FactoryBot.create(:user, member_in_project: project, member_with_permissions: permissions, login: "johndoe")
  end
  let(:author) { FactoryBot.create(:user, login: "marktwain") }
  let(:send_mail) { true }

  subject { described_class.new.perform(journal.id, send_mail) }

  before do
    # make sure no other calls are made due to WP creation/update
    allow(OpenProject::Notifications).to receive(:send) # ... and do nothing
  end

  context 'for work packages' do
    let(:work_package) do
      FactoryBot.create(:work_package,
                        project: project,
                        author: author,
                        assigned_to: recipient)
    end
    let(:journal) { journal_1 }
    let(:journal_1) { work_package.journals.first }
    let(:journal_2) do
      work_package.add_journal author, 'something I have to say'
      work_package.save(validate: false)
      work_package.journals.last
    end

    shared_examples_for 'sends notification' do
      it 'sends a notification' do
        expect(OpenProject::Notifications)
          .to receive(:send)
          .with(OpenProject::Events::AGGREGATED_WORK_PACKAGE_JOURNAL_READY,
                journal: an_instance_of(Journal::AggregatedJournal),
                send_mail: send_mail)

        subject
      end
    end

    shared_examples_for 'sends no notification' do
      it 'sends no notification' do
        expect(OpenProject::Notifications)
          .not_to receive(:send)

        subject
      end
    end

    it_behaves_like 'sends notification'

    context 'non-existant journal' do
      before do
        journal.destroy
      end

      it_behaves_like 'sends no notification'
    end

    context 'outdated journal' do
      before do
        # make sure there is a later journal, that supersedes the original one
        work_package.subject = 'changed subject'
        work_package.save!
      end

      it_behaves_like 'sends no notification'
    end

    describe 'journal creation' do
      context 'work_package_created' do
        before do
          FactoryBot.create(:work_package, project: project)
        end

        it_behaves_like 'sends notification'
      end

      context 'work_package_updated' do
        before do
          work_package.add_journal(author)
          work_package.subject = 'A change to the issue'
          work_package.save!(validate: false)
        end

        it_behaves_like 'sends notification'
      end

      context 'work_package_note_added' do
        before do
          work_package.add_journal(author, 'This update has a note')
          work_package.save!(validate: false)
        end

        it_behaves_like 'sends notification'
      end
    end

    describe 'mail suppressing aggregation' do
      # business logic of whether to send or not to send a mail is mainly driven by the presence
      # of an aggregated journal. However, there is an edge case that could lead to a notification
      # getting lost. Sadly this is very implementation specific, so I'll describe it:
      #  Journal 1: comment
      #  Journal 2: change (this can also be multiple journals)
      #  Journal 3: comment
      #
      # The Job for the first journal will not send any mail, because Journal 2 supersedes it.
      # However, after adding Journal 3, the aggregation will look like (1), (2, 3). Therefore the
      # job for Journal 2 will not send a notification. Finally the job for Journal 3 will send a
      # notification, but only containing the changes of 2 and 3. The comment of journal 1 is lost.
      # Therefore two things have to happen:
      # - someone needs to send notifications for the hidden journal
      #   (done by JournalNotificationMailer)
      # - in case a journal is hidden, its Job is not allowed to enqueue a mail for it
      #   (because someone else will do it on behalf)
      #   This is important since late exec of a Job might cause it to _not_ skip notifications

      before do
        change = { subject: 'new subject' }
        note = { journal_notes: 'a comment' }

        allow(WorkPackages::UpdateContract).to receive(:new).and_return(NoopContract.new)
        service = WorkPackages::UpdateService.new(user: author, model: work_package)

        expect(service.call(**note)).to be_success
        expect(service.call(**change)).to be_success
        expect(service.call(**note)).to be_success
      end

      let(:timeout) { Setting.journal_aggregation_time_minutes.to_i.minutes }
      let(:journal_1) { work_package.journals[1] }
      let(:journal_2) { work_package.journals[2] }
      let(:journal_3) { work_package.journals[3] }

      context 'all changes happen within the timeout of journal 1' do
        # The job for 1 will know, that Journal 3 took its addition.
        # The job for 2 will know, that it has become part of Journal 3.
        #  -> no special behaviour required

        context 'for journal 1' do
          let(:journal) { journal_1 }

          it_behaves_like 'sends notification' # for journal 1
        end

        context 'for journal 2' do
          let(:journal) { journal_2 }

          it_behaves_like 'sends no notification'
        end

        context 'for journal 3' do
          let(:journal) { journal_3 }

          it_behaves_like 'sends notification' # for journals 2 and 3
        end
      end

      context 'journal 3 created after timeout of 1, but inside of timeout for 2' do
        # Job 1 will not send a mail because it does not know about journal 3
        #   (thinking 2 will take its mail)
        # The mail of Job 1 is taken over by the JournalNotificationMailer for Journal 3
        # Even if Job 1 knew of journal 3 (due to late execution), it was not allowed to send a mail
        #   (that would cause a duplicate mail delivery)

        before do
          journal_2.created_at = journal_1.created_at + (timeout / 2)
          journal_3.created_at = journal_1.created_at + timeout + 5.seconds
          journal_2.save!
          journal_3.save!
        end

        context 'for journal 1' do
          let(:journal) { journal_1 }

          it_behaves_like 'sends no notification'
        end

        context 'for journal 2' do
          let(:journal) { journal_2 }

          it_behaves_like 'sends no notification'
        end

        context 'for journal 3' do
          let(:journal) { journal_3 }

          it_behaves_like 'sends notification' # for journals 1, 2 and 3
        end
      end

      context 'journal 3 created after timeout of 1 and 2' do
        # This is a normal case again, ensuring nobody takes responsibility when not necessary.

        before do
          journal_2.created_at = journal_1.created_at + (timeout / 2)
          journal_3.created_at = journal_2.created_at + timeout + 5.seconds
          journal_2.save!
          journal_3.save!
        end

        context 'for journal 1' do
          let(:journal) { journal_1 }

          it_behaves_like 'sends no notification'
        end

        context 'for journal 2' do
          let(:journal) { journal_2 }

          it_behaves_like 'sends notification' # for journals 1 and 2
        end

        context 'for journal 3' do
          let(:journal) { journal_3 }

          it_behaves_like 'sends notification' # for journal 3
        end
      end
    end
  end

  context 'for wiki page content' do
    let(:wiki_page_content) do
      wiki = FactoryBot.create(:wiki,
                               project: project)

      FactoryBot.create(:wiki_page_with_content, wiki: wiki).content
    end

    let(:journal) { journal_1 }
    let(:journal_1) { wiki_page_content.journals.first }
    let(:journal_2) do
      wiki_page_content.add_journal author, 'something I have to say'
      wiki_page_content.save(validate: false)
      wiki_page_content.journals.last
    end

    it 'sends a notification' do
      expect(OpenProject::Notifications)
        .to receive(:send)
        .with(OpenProject::Events::AGGREGATED_WIKI_JOURNAL_READY,
              journal: an_instance_of(Journal::AggregatedJournal),
              send_mail: send_mail)

      subject
    end
  end
end