# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
module DeleteCustomFieldJoins
  @columns =  ['id', 'custom_field_master_id', 'supporter_id', 'value', 'created_at', 'updated_at', 'metadata']
  def self.find_multiple_custom_field_joins
    bad_results = Qx.select("CONCAT(custom_field_joins.supporter_id, '_', custom_field_joins.custom_field_master_id) AS our_concat, COUNT(id) AS our_count").
        from(:custom_field_joins).
        group_by("our_concat").
        having('COUNT(id) > 1').parse


    custom_field_joins_from_qx = CustomFieldJoin.
        where("CONCAT(custom_field_joins.supporter_id, '_', custom_field_joins.custom_field_master_id) IN (SELECT our_concat FROM (#{bad_results}) AS ignore)").
        select('id, custom_field_master_id, supporter_id, created_at, updated_at')
    grouped_custom_field_joins = custom_field_joins_from_qx.group_by{|tj| "#{tj.supporter_id}_#{tj.custom_field_master_id}"}


    ids_to_delete = []
    grouped_custom_field_joins.each { |_, v|

      sorted = v.sort_by {|a| a.updated_at }.to_a
      ids_to_delete += sorted.map{|i| i.id}[0, sorted.count - 1]
    }

    ids_to_delete
  end

  def self.copy_and_delete(ids_to_delete)
    if ids_to_delete.any?
      Qx.insert_into(:custom_field_joins_backup, @columns).select(@columns).from(:custom_field_joins).where('id IN ($ids)', ids:ids_to_delete).execute
      CustomFieldJoin.where('id IN (?)', ids_to_delete).delete_all
    end

  end

  def self.revert
    Qx.insert_into(:custom_field_joins, @columns).select(@columns).from(:custom_field_joins_backup).execute
    Qx.execute_raw("DELETE FROM custom_field_joins_backup")
  end
end