class PoolVersion < ApplicationRecord
  belongs_to :updater, :class_name => "User"
  belongs_to :pool

  def self.enabled?
    Danbooru.config.aws_sqs_archives_url.present?
  end

  establish_connection (ENV["ARCHIVE_DATABASE_URL"] || "archive_#{Rails.env}".to_sym) if enabled?

  module SearchMethods
    def default_order
      order(updated_at: :desc)
    end

    def for_user(user_id)
      where("updater_id = ?", user_id)
    end

    def for_post_id(post_id)
      where_array_includes_any(:added_post_ids, [post_id]).or(where_array_includes_any(:removed_post_ids, [post_id]))
    end

    def name_matches(name)
      name = normalize_name_for_search(name)
      name = "*#{name}*" unless name =~ /\*/
      where_ilike(:name, name)
    end

    def search(params)
      q = super
      q = q.search_attributes(params, :pool_id, :post_ids, :added_post_ids, :removed_post_ids, :updater_id, :description, :description_changed, :name, :name_changed, :version, :is_active, :is_deleted, :category)

      if params[:post_id]
        q = q.for_post_id(params[:post_id].to_i)
      end

      if params[:name_matches].present?
        q = q.name_matches(params[:name_matches])
      end

      if params[:updater_name].present?
        q = q.where(updater_id: User.name_to_id(params[:updater_name]))
      end

      if params[:is_new].to_s.truthy?
        q = q.where(version: 1)
      elsif params[:is_new].to_s.falsy?
        q = q.where("version != 1")
      end

      q.apply_default_order(params)
    end
  end

  extend SearchMethods

  def self.sqs_service
    SqsService.new(Danbooru.config.aws_sqs_archives_url)
  end

  def self.queue(pool, updater, updater_ip_addr)
    # queue updates to sqs so that if archives goes down for whatever reason it won't
    # block pool updates
    raise NotImplementedError.new("Archive service is not configured.") if !enabled?

    json = {
      pool_id: pool.id,
      post_ids: pool.post_ids,
      updater_id: updater.id,
      updater_ip_addr: updater_ip_addr.to_s,
      created_at: pool.created_at.try(:iso8601),
      updated_at: pool.updated_at.try(:iso8601),
      description: pool.description,
      name: pool.name,
      is_active: pool.is_active?,
      is_deleted: pool.is_deleted?,
      category: pool.category
    }
    msg = "add pool version\n#{json.to_json}"
    sqs_service.send_message(msg, message_group_id: "pool:#{pool.id}")
  end

  def self.normalize_name(name)
    name.gsub(/[_[:space:]]+/, "_").gsub(/\A_|_\z/, "")
  end

  def self.normalize_name_for_search(name)
    normalize_name(name).mb_chars.downcase
  end

  def build_diff(other = previous)
    diff = {}

    if other.nil?
      diff[:added_post_ids] = added_post_ids
      diff[:removed_post_ids] = removed_post_ids
      diff[:added_desc] = description
    else
      diff[:added_post_ids] = post_ids - other.post_ids
      diff[:removed_post_ids] = other.post_ids - post_ids
      diff[:added_desc] = description
      diff[:removed_desc] = other.description
    end

    diff
  end

  def previous
    @previous ||= begin
      PoolVersion.where("pool_id = ? and version < ?", pool_id, version).order("version desc").limit(1).to_a
    end
    @previous.first
  end

  def self.status_fields
    {
      name: "Renamed",
      description: "Description",
      was_deleted: "Deleted",
      was_undeleted: "Undeleted",
      was_activated: "Activated",
      was_deactivated: "Deactivated",
    }
  end

  def was_deleted
    is_deleted && !previous.is_deleted
  end

  def was_undeleted
    !is_deleted && previous.is_deleted
  end

  def was_activated
    is_active && !previous.is_active
  end

  def was_deactivated
    !is_active && previous.is_active
  end

  def text_field_changed
    previous.present? && (name_changed || description_changed)
  end

  def pretty_name
    name.tr("_", " ")
  end

  def self.available_includes
    [:updater, :pool]
  end
end