namespace :gitlab do
  namespace :storage do
    desc 'GitLab | Storage | Migrate existing projects to Hashed Storage'
    task migrate_to_hashed: :environment do
      if Gitlab::Database.read_only?
        abort 'This task requires database write access. Exiting.'
      end

      storage_migrator = Gitlab::HashedStorage::Migrator.new
      helper = Gitlab::HashedStorage::RakeHelper

      if storage_migrator.rollback_pending?
        abort "There is already a rollback operation in progress, " \
             "running a migration at the same time may have unexpected consequences."
      end

      if helper.range_single_item?
        project = Project.with_unmigrated_storage.find_by(id: helper.range_from)

        unless project
          abort "There are no projects requiring storage migration with ID=#{helper.range_from}"
        end

        puts "Enqueueing storage migration of #{project.full_path} (ID=#{project.id})..."
        storage_migrator.migrate(project)
      else
        legacy_projects_count = if helper.using_ranges?
                                  Project.with_unmigrated_storage.id_in(helper.range_from..helper.range_to).count
                                else
                                  Project.with_unmigrated_storage.count
                                end

        if legacy_projects_count == 0
          abort 'There are no projects requiring storage migration. Nothing to do!'
        end

        print "Enqueuing migration of #{legacy_projects_count} projects in batches of #{helper.batch_size}"

        helper.project_id_batches_migration do |start, finish|
          storage_migrator.bulk_schedule_migration(start: start, finish: finish)

          print '.'
        end
      end

      puts ' Done!'
    end

    desc 'GitLab | Storage | Rollback existing projects to Legacy Storage'
    task rollback_to_legacy: :environment do
      if Gitlab::Database.read_only?
        abort 'This task requires database write access. Exiting.'
      end

      storage_migrator = Gitlab::HashedStorage::Migrator.new
      helper = Gitlab::HashedStorage::RakeHelper

      if storage_migrator.migration_pending?
        abort "There is already a migration operation in progress, " \
             "running a rollback at the same time may have unexpected consequences."
      end

      if helper.range_single_item?
        project = Project.with_storage_feature(:repository).find_by(id: helper.range_from)

        unless project
          abort "There are no projects that can be rolledback with ID=#{helper.range_from}"
        end

        puts "Enqueueing storage rollback of #{project.full_path} (ID=#{project.id})..."
        storage_migrator.rollback(project)
      else
        hashed_projects_count = if helper.using_ranges?
                                  Project.with_storage_feature(:repository).id_in(helper.range_from..helper.range_to).count
                                else
                                  Project.with_storage_feature(:repository).count
                                end

        if hashed_projects_count == 0
          abort 'There are no projects that can have storage rolledback. Nothing to do!'
        end

        print "Enqueuing rollback of #{hashed_projects_count} projects in batches of #{helper.batch_size}"

        helper.project_id_batches_rollback do |start, finish|
          storage_migrator.bulk_schedule_rollback(start: start, finish: finish)

          print '.'
        end
      end

      puts ' Done!'
    end

    desc 'Gitlab | Storage | Summary of existing projects using Legacy Storage'
    task legacy_projects: :environment do
      helper = Gitlab::HashedStorage::RakeHelper
      helper.relation_summary('projects using Legacy Storage', Project.without_storage_feature(:repository))
    end

    desc 'Gitlab | Storage | List existing projects using Legacy Storage'
    task list_legacy_projects: :environment do
      helper = Gitlab::HashedStorage::RakeHelper
      helper.projects_list('projects using Legacy Storage', Project.without_storage_feature(:repository))
    end

    desc 'Gitlab | Storage | Summary of existing projects using Hashed Storage'
    task hashed_projects: :environment do
      helper = Gitlab::HashedStorage::RakeHelper
      helper.relation_summary('projects using Hashed Storage', Project.with_storage_feature(:repository))
    end

    desc 'Gitlab | Storage | List existing projects using Hashed Storage'
    task list_hashed_projects: :environment do
      helper = Gitlab::HashedStorage::RakeHelper
      helper.projects_list('projects using Hashed Storage', Project.with_storage_feature(:repository))
    end

    desc 'Gitlab | Storage | Summary of project attachments using Legacy Storage'
    task legacy_attachments: :environment do
      helper = Gitlab::HashedStorage::RakeHelper
      helper.relation_summary('attachments using Legacy Storage', helper.legacy_attachments_relation)
    end

    desc 'Gitlab | Storage | List existing project attachments using Legacy Storage'
    task list_legacy_attachments: :environment do
      helper = Gitlab::HashedStorage::RakeHelper
      helper.attachments_list('attachments using Legacy Storage', helper.legacy_attachments_relation)
    end

    desc 'Gitlab | Storage | Summary of project attachments using Hashed Storage'
    task hashed_attachments: :environment do
      helper = Gitlab::HashedStorage::RakeHelper
      helper.relation_summary('attachments using Hashed Storage', helper.hashed_attachments_relation)
    end

    desc 'Gitlab | Storage | List existing project attachments using Hashed Storage'
    task list_hashed_attachments: :environment do
      helper = Gitlab::HashedStorage::RakeHelper
      helper.attachments_list('attachments using Hashed Storage', helper.hashed_attachments_relation)
    end
  end
end