discourse-import_scripts/goss-cleanup.rb

# Federated Computer, Inc.
# David Sainty <saint@federated.computer>  2024 A.D.
# Gossamer Threads to Discourse -- CleanUp Script
# v0.16 Add parallel deletion of posts.

require 'concurrent-ruby'
require File.expand_path("../../../../config/environment", __FILE__)

class GossamerForumsCleaner
  def cleanup_users
    puts "Cleaning up imported users..."
    # Find all users imported from Gossamer Forums and delete them
    UserCustomField.where(name: 'original_gossamer_id').each do |field|
      user = User.find_by(id: field.user_id)
      if user
        puts "Deleting user #{user.username} (ID: #{user.id})"
        user.destroy
      end
    end
  end

  def cleanup_categories
    puts "Cleaning up imported categories..."
    # Find all categories that were imported and delete them
    CategoryCustomField.where(name: 'original_gossamer_id').each do |field|
      category = Category.find_by(id: field.category_id)
      if category
        puts "Deleting category #{category.name} (ID: #{category.id})"
        category.destroy
      end
    end
  end

  def cleanup_topics
    puts "Cleaning up imported topics..."
    # Find all topics that were imported and delete them
    TopicCustomField.where(name: 'original_gossamer_id').each do |field|
      topic = Topic.find_by(id: field.topic_id)
      if topic
        puts "Deleting topic #{topic.title} (ID: #{topic.id})"
#        topic.posts.each do |post|
#          puts "Deleting post #{post.id} in topic #{topic.id}"
#          post.destroy
#        end
        topic.destroy
      end
    end
  end

  def cleanup_topics_former_user
    puts "Cleaning up imported topics..."
  
    # Find all topics that were imported
    TopicCustomField.where(name: 'original_gossamer_id').each do |field|
      topic = Topic.find_by(id: field.topic_id)
    
      next unless topic

      # Fetch the first post in the topic
      first_post = topic.posts.order(:created_at).first
    
      # Check if the first post has user_id 2
      if first_post && first_post.user_id == 2
        puts "Deleting topic #{topic.title} (ID: #{topic.id})"

        # Destroy all posts in the topic
        topic.posts.each do |post|
          puts "Deleting post #{post.id} in topic #{topic.id}"
          post.destroy
        end
  
        # Destroy the topic itself
        topic.destroy
      end
    end
  end

  def cleanup_posts
    puts "Cleaning up imported posts..."
    # Find all posts that were imported and delete them
    PostCustomField.where(name: 'original_gossamer_id').each do |field|
      post = Post.find_by(id: field.post_id)
      if post
        puts "Deleting post #{post.id} (ID: #{post.id})"
        post.destroy
      end
    end
  end

  def cleanup_posts_parallel
    puts "Cleaning up imported posts..."
  
    # Define the number of threads to use
    num_threads = 8
    pool = Concurrent::FixedThreadPool.new(num_threads)
  
    PostCustomField.where(name: 'original_gossamer_id').in_batches(of: 1000) do |batch|
      batch.each do |field|
        pool.post do
          post = Post.find_by(id: field.post_id)
          if post
            puts "Deleting post #{post.id} (ID: #{post.id})"
            post.destroy
          end
        end
      end
    end
  
    # Wait for all threads to complete
    pool.shutdown
    pool.wait_for_termination
  end

  def cleanup_messages
    puts "Cleaning up imported personal messages..."
    # Find all personal messages (inbox) that were imported and delete them
    TopicCustomField.where(name: 'original_gossamer_msg_id').each do |field|
      topic = Topic.find_by(id: field.topic_id)
      if topic
        puts "Deleting personal message topic #{topic.title} (ID: #{topic.id})"
        topic.posts.each do |post|
          puts "Deleting post #{post.id} in personal message topic #{topic.id}"
          post.destroy
        end
        topic.destroy
      end
    end
  end

  def perform_cleanup
    puts "Cleanup beginning!"
#    cleanup_messages
#    cleanup_topics
    cleanup_topics_former_user
#    cleanup_posts_parallel
#    cleanup_categories
#    cleanup_users
    puts "Cleanup complete!"
  end
end

GossamerForumsCleaner.new.perform_cleanup