# Federated Computer, Inc.
# David Sainty <saint@federated.computer>  2024 A.D.
# Gossamer Threads to Discourse -- Soft Deletion of Marked-As-Deleted Posts
# v0.2 Address where due to import issues there are some stray PostCustomField records for Posts that do not exist.

require 'mysql2'
require 'active_record'

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

class GossamerForumsSoftDelDeletedPosts < ImportScripts::Base
  def initialize
    super
      begin
        # Initialize MySQL client to connect to Gossamer Forums database
        @mysql_client = Mysql2::Client.new(
          host: "slowtwitch.northend.network",
          username: "admin",
          password: "yxnh93Ybbz2Nm8#mp28zCVv",
          database: "slowtwitch"
        )
      rescue Mysql2::Error => e
        puts "Error connecting to MySQL: #{e.message}"
        exit 1
      end
  end

  # Define a method to find a post by custom field
  def find_post_by_custom_field(post_id)
    puts "SoftDelDeletedPosts: Searching for post with original_gossamer_id: #{post_id}"
  
    post_custom_field = PostCustomField.find_by(name: 'original_gossamer_id', value: post_id.to_s)
  
    if post_custom_field
      post = post_custom_field.post
      puts "SoftDelDeletedPosts: Found post with id: #{post.id}"
      post
    else
      puts "SoftDelDeletedPosts: No post found with original_gossamer_id: #{post_id}"
      nil
    end
  end

  # Soft delete the post, whether topic post (OP) or reply post
  def soft_delete_post(post, deleted_by_id)
    if post.deleted_at.nil?
#      # Get the post's owner and topic information
#      user = User.find_by(id: post.user_id)  # Fetch user details
#      topic = Topic.find_by(id: post.topic_id)  # Fetch topic details
  
#      # Display post, user, and topic information
#      puts "DELETING POST: SoftDelDeletedPosts: Soft deleting post with id: #{post.id}"
#      puts " - Post owner: #{user.username} (ID: #{user.id})"
#      puts " - Topic title: '#{topic.title}' (Topic ID: #{topic.id})"
  
      # Perform the soft delete by updating the fields
##      post.deleted_at = Time.now
##      post.deleted_by_id = deleted_by_id
##      post.save
      puts "... actual deleted_at step"
###      post.update(deleted_at: Time.now, deleted_by_id: deleted_by_id)
    else
      puts "SoftDelDeletedPosts: Post with id: #{post.id} is already soft deleted."
    end
  end

  # Define the method to delete posts based on the Gossamer Forums flag
  def soft_del_deleted_posts_from_gossamer_with_user(username)
 
    # Query the user ID from the legacy MySQL database
    user_result = @mysql_client.query("SELECT user_id FROM gforum_User WHERE user_username = '#{username}' LIMIT 1")
    user_id_row = user_result.first
    if user_id_row.nil?
      puts "DiscourseDeletedPosts: No user found with username: #{username}"
      return
    end
    user_id = user_id_row['user_id']

    # Find all posts marked as deleted by the given user
    posts_result = @mysql_client.query("SELECT post_id FROM gforum_Post WHERE post_deleted = 1 AND user_id_fk = #{user_id}")

    # "admin" user is ID 1, so set as the one performing the deletions
    deleted_by_id = 1

    posts_result.each do |legacy_post|
      post_id = legacy_post['post_id']

      # Look for the post in Discourse by custom field
      post = find_post_by_custom_field(post_id)
  
      if post
        # Soft delete only the individual post (whether topic post / OP or a reply post)
        soft_delete_post(post, deleted_by_id)
      end
    end
  end

  # Define the method to reverse (soft undelete) the soft deletion
  def soft_undelete_post(post)
    if post.deleted_at.present?
      # Get the post's owner and topic information
      user = User.find_by(id: post.user_id)  # Fetch user details
      topic = Topic.find_by(id: post.topic_id)  # Fetch topic details
  
      # Display post, user, and topic information
      puts "RESTORING POST: SoftDelDeletedPosts: Soft undeleting post with id: #{post.id}"
      puts " - Post owner: #{user.username} (ID: #{user.id})"
      puts " - Topic title: '#{topic.title}' (Topic ID: #{topic.id})"
  
      # Reverse the soft delete by setting deleted_at and deleted_by_id to nil
      ### post.update(deleted_at: nil, deleted_by_id: nil)
    else
      puts "SoftDelDeletedPosts: Post with id: #{post.id} is not soft deleted."
    end
  end

  # Define the method to reverse the soft deletion for all legacy posts
  def soft_undelete_all_deleted_posts
    # Query the legacy database for posts marked as deleted
    posts_result = @mysql_client.query("SELECT post_id FROM gforum_Post WHERE post_deleted = 1")
  
    posts_result.each do |legacy_post|
      post_id = legacy_post['post_id']
  
      # Look for the post in Discourse by custom field
      post = find_post_by_custom_field(post_id)
  
      if post
        # Reverse the soft deletion (restore the post)
        soft_undelete_post(post)
      end
    end
  end

  # Define the method to delete posts based on the Gossamer Forums flag
  def soft_del_all_deleted_posts

    # Find all posts marked as deleted by the given user
    posts_result = @mysql_client.query("SELECT post_id FROM gforum_Post WHERE post_deleted = 1")

    # "admin" user is ID 1, so set as the one performing the deletions
    deleted_by_id = 1

    posts_result.each do |legacy_post|
      post_id = legacy_post['post_id']

#      # Look for the post in Discourse by custom field
#      post = find_post_by_custom_field(post_id)
#
#      if post
#        # Soft delete only the individual post (whether topic post / OP or a reply post)
#        soft_delete_post(post, deleted_by_id)
#      end
      soft_del_all_deleted_posts_by_custom_field(post_id, deleted_by_id)
    end
  end

  # Define a method to find all posts by the original Gossamer Forums post ID and soft delete them
  def soft_del_all_deleted_posts_by_custom_field(post_id, deleted_by_id)
    puts "SoftDelDeletedPosts: Searching for all posts with original_gossamer_id: #{post_id}"
  
    # Find all PostCustomField records with the given Gossamer Forums post_id
    post_custom_fields = PostCustomField.where(name: 'original_gossamer_id', value: post_id.to_s)
  
    if post_custom_fields.any?
      post_custom_fields.each do |post_custom_field|
        post = post_custom_field.post
  
        if post
          puts "DELETING POST: SoftDelDeletedPosts: Soft deleting post with id: #{post.id}  and user_id: #{post.user_id}  and topic_id: #{post.topic_id}"
          # Get the post's owner and topic information
#          user = User.find_by(id: post.user_id)  # Fetch user details
#          topic = Topic.find_by(id: post.topic_id)  # Fetch topic details
  
          # Display post, user, and topic information
#          puts " - Post owner: #{user.username} (ID: #{user.id})"
#          puts " - Topic title: '#{topic.title}' (Topic ID: #{topic.id})"
  
          # Soft delete the post if not already deleted
          soft_delete_post(post, deleted_by_id)
        else
          puts "SoftDelDeletedPosts: Found PostCustomField with no corresponding post (ID: #{post_custom_field.id})"
        end
      end
    else
      puts "SoftDelDeletedPosts: No PostCustomField records found with original_gossamer_id: #{post_id}"
    end
  end


  def perform_deleted_soft_del
    puts "Soft Del Deleted Posts beginning!"

    ## soft_del_deleted_posts_from_gossamer_with_user('spudone')

    ## soft_undelete_all_deleted_posts

    soft_del_all_deleted_posts

    puts "Soft Del Deleted Posts complete!"
  end
end

GossamerForumsSoftDelDeletedPosts.new.perform_deleted_soft_del