# frozen_string_literal: true

require 'spec_helper'

RSpec.describe Todos::Destroy::EntityLeaveService do
  let_it_be(:user, reload: true)    { create(:user) }
  let_it_be(:user2, reload: true)   { create(:user) }

  let(:group)   { create(:group, :private) }
  let(:project) { create(:project, :private, group: group) }
  let(:issue)                 { create(:issue, project: project) }
  let(:issue_c)               { create(:issue, project: project, confidential: true) }
  let!(:todo_group_user)       { create(:todo, user: user, group: group) }
  let!(:todo_group_user2)      { create(:todo, user: user2, group: group) }

  let(:mr)                  { create(:merge_request, source_project: project) }
  let!(:todo_mr_user)       { create(:todo, user: user, target: mr, project: project) }
  let!(:todo_issue_user)    { create(:todo, user: user, target: issue, project: project) }
  let!(:todo_issue_c_user)  { create(:todo, user: user, target: issue_c, project: project) }
  let!(:todo_issue_c_user2) { create(:todo, user: user2, target: issue_c, project: project) }

  shared_examples 'using different access permissions' do
    before do
      set_access(project, user, project_access) if project_access
      set_access(group, user, group_access) if group_access
    end

    it "#{params[:method].to_s.humanize(capitalize: false)}" do
      send(method_name)
    end
  end

  shared_examples 'does not remove any todos' do
    it { does_not_remove_any_todos }
  end

  shared_examples 'removes only confidential issues todos' do
    it { removes_only_confidential_issues_todos }
  end

  def does_not_remove_any_todos
    expect { subject }.not_to change { Todo.count }
  end

  def removes_only_confidential_issues_todos
    expect { subject }.to change { Todo.count }.from(6).to(5)
  end

  def removes_confidential_issues_and_merge_request_todos
    expect { subject }.to change { Todo.count }.from(6).to(4)
    expect(user.todos).to match_array([todo_issue_user, todo_group_user])
  end

  def set_access(object, user, access_name)
    case access_name
    when :developer
      object.add_developer(user)
    when :reporter
      object.add_reporter(user)
    when :guest
      object.add_guest(user)
    end
  end

  describe '#execute' do
    describe 'updating a Project' do
      subject { described_class.new(user.id, project.id, 'Project').execute }

      # a private project in a private group is valid
      context 'when project is private' do
        context 'when user is not a member of the project' do
          it 'removes project todos for the provided user' do
            expect { subject }.to change { Todo.count }.from(6).to(3)

            expect(user.todos).to match_array([todo_group_user])
            expect(user2.todos).to match_array([todo_issue_c_user2, todo_group_user2])
          end
        end

        context 'access permissions' do
          where(:group_access, :project_access, :method_name) do
            [
              [nil,       :reporter, :does_not_remove_any_todos],
              [nil,       :guest,    :removes_confidential_issues_and_merge_request_todos],
              [:reporter, nil,       :does_not_remove_any_todos],
              [:guest,    nil,       :removes_confidential_issues_and_merge_request_todos],
              [:guest,    :reporter, :does_not_remove_any_todos],
              [:guest,    :guest,    :removes_confidential_issues_and_merge_request_todos]
            ]
          end

          with_them do
            it_behaves_like 'using different access permissions'
          end
        end
      end

      # a private project in an internal/public group is valid
      context 'when project is private in an internal/public group' do
        let(:group) { create(:group, :internal) }

        context 'when user is not a member of the project' do
          it 'removes project todos for the provided user' do
            expect { subject }.to change { Todo.count }.from(6).to(3)

            expect(user.todos).to match_array([todo_group_user])
            expect(user2.todos).to match_array([todo_issue_c_user2, todo_group_user2])
          end
        end

        context 'access permissions' do
          where(:group_access, :project_access, :method_name) do
            [
              [nil,       :reporter, :does_not_remove_any_todos],
              [nil,       :guest,    :removes_confidential_issues_and_merge_request_todos],
              [:reporter, nil,       :does_not_remove_any_todos],
              [:guest,    nil,       :removes_confidential_issues_and_merge_request_todos],
              [:guest,    :reporter, :does_not_remove_any_todos],
              [:guest,    :guest,    :removes_confidential_issues_and_merge_request_todos]
            ]
          end

          with_them do
            it_behaves_like 'using different access permissions'
          end
        end
      end

      # an internal project in an internal/public group is valid
      context 'when project is not private' do
        let(:group)   { create(:group, :internal) }
        let(:project) { create(:project, :internal, group: group) }
        let(:issue)   { create(:issue, project: project) }
        let(:issue_c) { create(:issue, project: project, confidential: true) }

        it 'enqueues the PrivateFeaturesWorker' do
          expect(TodosDestroyer::PrivateFeaturesWorker)
            .to receive(:perform_async).with(project.id, user.id)

          subject
        end

        context 'confidential issues' do
          context 'when a user is not an author of confidential issue' do
            it_behaves_like 'removes only confidential issues todos'
          end

          context 'when a user is an author of confidential issue' do
            before do
              issue_c.update!(author: user)
            end

            it_behaves_like 'does not remove any todos'
          end

          context 'when a user is an assignee of confidential issue' do
            before do
              issue_c.assignees << user
            end

            it_behaves_like 'does not remove any todos'
          end

          context 'access permissions' do
            where(:group_access, :project_access, :method_name) do
              [
                [nil,       :reporter, :does_not_remove_any_todos],
                [nil,       :guest,    :removes_only_confidential_issues_todos],
                [:reporter, nil,       :does_not_remove_any_todos],
                [:guest,    nil,       :removes_only_confidential_issues_todos],
                [:guest,    :reporter, :does_not_remove_any_todos],
                [:guest,    :guest,    :removes_only_confidential_issues_todos]
              ]
            end

            with_them do
              it_behaves_like 'using different access permissions'
            end
          end
        end

        context 'feature visibility check' do
          context 'when issues are visible only to project members' do
            before do
              project.project_feature.update!(issues_access_level: ProjectFeature::PRIVATE)
            end

            it 'removes only users issue todos' do
              expect { subject }.to change { Todo.count }.from(6).to(5)
            end
          end
        end
      end
    end

    describe 'updating a Group' do
      subject { described_class.new(user.id, group.id, 'Group').execute }

      context 'when group is private' do
        context 'when a user leaves a group' do
          it 'removes group and subproject todos for the user' do
            expect { subject }.to change { Todo.count }.from(6).to(2)

            expect(user.todos).to be_empty
            expect(user2.todos).to match_array([todo_issue_c_user2, todo_group_user2])
          end
        end

        context 'access permissions' do
          where(:group_access, :project_access, :method_name) do
            [
              [nil,       :reporter, :does_not_remove_any_todos],
              [nil,       :guest,    :removes_confidential_issues_and_merge_request_todos],
              [:reporter, nil,       :does_not_remove_any_todos],
              [:guest,    nil,       :removes_confidential_issues_and_merge_request_todos],
              [:guest,    :reporter, :does_not_remove_any_todos],
              [:guest,    :guest,    :removes_confidential_issues_and_merge_request_todos]
            ]
          end

          with_them do
            it_behaves_like 'using different access permissions'
          end
        end

        context 'with nested groups' do
          let(:parent_group) { create(:group, :public) }
          let(:parent_subgroup) { create(:group)}
          let(:subgroup) { create(:group, :private, parent: group) }
          let(:subgroup2) { create(:group, :private, parent: group) }
          let(:subproject) { create(:project, group: subgroup) }
          let(:subproject2) { create(:project, group: subgroup2) }

          let!(:todo_subproject_user) { create(:todo, user: user, project: subproject) }
          let!(:todo_subproject2_user) { create(:todo, user: user, project: subproject2) }
          let!(:todo_subgroup_user) { create(:todo, user: user, group: subgroup) }
          let!(:todo_subgroup2_user) { create(:todo, user: user, group: subgroup2) }
          let!(:todo_subproject_user2) { create(:todo, user: user2, project: subproject) }
          let!(:todo_subpgroup_user2)  { create(:todo, user: user2, group: subgroup) }
          let!(:todo_parent_group_user) { create(:todo, user: user, group: parent_group) }

          before do
            group.update!(parent: parent_group)
          end

          context 'when the user is not a member of any groups/projects' do
            it 'removes todos for the user including subprojects todos' do
              expect { subject }.to change { Todo.count }.from(13).to(5)

              expect(user.todos).to eq([todo_parent_group_user])
              expect(user2.todos)
                .to match_array(
                  [todo_issue_c_user2, todo_group_user2, todo_subproject_user2, todo_subpgroup_user2]
                )
            end
          end

          context 'when the user is member of a parent group' do
            before do
              parent_group.add_developer(user)
            end

            it_behaves_like 'does not remove any todos'
          end

          context 'when the user is member of a subgroup' do
            before do
              subgroup.add_developer(user)
            end

            it 'does not remove group and subproject todos' do
              expect { subject }.to change { Todo.count }.from(13).to(8)

              expect(user.todos)
                .to match_array(
                  [todo_group_user, todo_subgroup_user, todo_subproject_user, todo_parent_group_user]
                )
              expect(user2.todos)
                .to match_array(
                  [todo_issue_c_user2, todo_group_user2, todo_subproject_user2, todo_subpgroup_user2]
                )
            end
          end

          context 'when the user is member of a child project' do
            before do
              subproject.add_developer(user)
            end

            it 'does not remove subproject and group todos' do
              expect { subject }.to change { Todo.count }.from(13).to(8)

              expect(user.todos)
                .to match_array(
                  [todo_subgroup_user, todo_group_user, todo_subproject_user, todo_parent_group_user]
                )
              expect(user2.todos)
                .to match_array(
                  [todo_issue_c_user2, todo_group_user2, todo_subproject_user2, todo_subpgroup_user2]
                )
            end
          end
        end
      end

      context 'when group is not private' do
        let(:group)   { create(:group, :internal) }
        let(:project) { create(:project, :internal, group: group) }
        let(:issue)   { create(:issue, project: project) }
        let(:issue_c) { create(:issue, project: project, confidential: true) }

        it 'enqueues the PrivateFeaturesWorker' do
          expect(TodosDestroyer::PrivateFeaturesWorker)
            .to receive(:perform_async).with(project.id, user.id)

          subject
        end

        context 'access permissions' do
          where(:group_access, :project_access, :method_name) do
            [
              [nil,       nil,       :removes_only_confidential_issues_todos],
              [nil,       :reporter, :does_not_remove_any_todos],
              [nil,       :guest,    :removes_only_confidential_issues_todos],
              [:reporter, nil,       :does_not_remove_any_todos],
              [:guest,    nil,       :removes_only_confidential_issues_todos],
              [:guest,    :reporter, :does_not_remove_any_todos],
              [:guest,    :guest,    :removes_only_confidential_issues_todos]
            ]
          end

          with_them do
            it_behaves_like 'using different access permissions'
          end
        end
      end
    end

    context 'when entity type is not valid' do
      it 'raises an exception' do
        expect { described_class.new(user.id, group.id, 'GroupWrongly').execute }
          .to raise_error(ArgumentError)
      end
    end

    context 'when entity was not found' do
      it 'does not remove any todos' do
        expect { described_class.new(user.id, non_existing_record_id, 'Group').execute }
          .not_to change { Todo.count }
      end
    end
  end
end