# frozen_string_literal: true

class Jobs::NotifyReviewable < ::Jobs::Base
  # remove all the legacy stuff here when redesigned_user_menu_enabled is
  # removed
  def execute(args)
    return unless reviewable = Reviewable.find_by(id: args[:reviewable_id])

    @contacted = Set.new

    all_updates = Hash.new { |h, k| h[k] = {} }

    if args[:updated_reviewable_ids].present?
      Reviewable
        .where(id: args[:updated_reviewable_ids])
        .each do |r|
          payload = { last_performing_username: args[:performing_username], status: r.status }

          all_updates[:admins][r.id] = payload
          all_updates[:moderators][r.id] = payload if r.reviewable_by_moderator?
          all_updates[r.reviewable_by_group_id][r.id] = payload if r.reviewable_by_group_id
        end
    end

    DistributedMutex.synchronize("notify_reviewable_job", validity: 120) do
      counts = Hash.new(0)
      Reviewable
        .default_visible
        .pending
        .group(:reviewable_by_moderator, :reviewable_by_group_id)
        .pluck(:reviewable_by_moderator, :reviewable_by_group_id, "count(*)")
        .each do |reviewable_by_moderator, reviewable_by_group_id, count|
          counts[:admins] += count
          counts[:moderators] += count if reviewable_by_moderator
          counts[reviewable_by_group_id] += count if reviewable_by_group_id
        end

      if legacy_user_menu?
        notify_legacy(
          User.real.admins.pluck(:id),
          count: counts[:admins],
          updates: all_updates[:admins],
        )
      else
        notify_users(User.real.admins, all_updates[:admins])
      end

      if reviewable.reviewable_by_moderator?
        if legacy_user_menu?
          notify_legacy(
            User.real.moderators.where("id NOT IN (?)", @contacted).pluck(:id),
            count: counts[:moderators],
            updates: all_updates[:moderators],
          )
        else
          notify_users(
            User.real.moderators.where("id NOT IN (?)", @contacted),
            all_updates[:moderators],
          )
        end
      end

      if SiteSetting.enable_category_group_moderation? && (group = reviewable.reviewable_by_group)
        users = group.users.includes(:group_users).where("users.id NOT IN (?)", @contacted)

        users.find_each do |user|
          count = 0
          updates = {}
          user.group_users.each do |gu|
            updates.merge!(all_updates[gu.group_id])
            count += counts[gu.group_id]
          end

          if legacy_user_menu?
            notify_legacy([user.id], count: count, updates: updates)
          else
            notify_user(user, updates)
          end
        end

        @contacted += users.pluck(:id)
      end
    end
  end

  protected

  def notify_legacy(user_ids, count:, updates:)
    return if user_ids.blank?

    data = { reviewable_count: count }
    data[:updates] = updates if updates.present?

    MessageBus.publish("/reviewable_counts", data, user_ids: user_ids)
    @contacted += user_ids
  end

  def notify_users(users, updates)
    users.find_each { |user| notify_user(user, updates) }
    @contacted += users.pluck(:id)
  end

  def notify_user(user, updates)
    user.publish_reviewable_counts(updates.present? ? { updates: updates } : nil)
  end

  def legacy_user_menu?
    SiteSetting.legacy_navigation_menu? && !SiteSetting.enable_new_notifications_menu
  end
end