class CmAdmin::Models::Export

def create_workbook(cm_model, records, _class_name, file_path)
  flattened_records = records.map { |record| CmAdmin::Utils.flatten_hash(record) }
  # columns = flattened_records.map{|x| x.keys}.flatten.uniq.sort
  columns = exportable_columns(cm_model).select { |column| flattened_records.first.keys.include?(column.field_name.to_s) }
  size_arr = []
  columns.size.times { size_arr << 22 }
  xl = Axlsx::Package.new
  xl.workbook.add_worksheet do |sheet|
    sheet.add_row columns&.map(&:header), b: true
    flattened_records.each do |record|
      sheet.add_row(columns.map { |column| record[column.field_name.to_s] })
    end
    sheet.column_widths(*size_arr)
  end
  xl.serialize(file_path)
end

def exportable_columns(klass)
  klass.available_fields[:index].select(&:exportable)
end

def format_records(records, model, selected_column_names, helpers)
  deserialized_columns = CmAdmin::Utils.deserialize_csv_columns(selected_column_names, :as_json_params)
  # This includes isn't recursve, a full solution should be recursive
  records_arr = []
  records.includes(deserialized_columns[:include].keys).find_each do |record|
    record_hash = record.as_json({ only: selected_column_names.map(&:to_sym) })
    selected_column_names.each do |column_name|
      break unless model.available_fields[:index].map(&:field_name).include?(column_name.to_sym)
      column = CmAdmin::Models::Column.find_by(model, :index, { name: column_name.to_sym })
      if column.field_type == :custom
        record_hash[column.field_name] = helpers.send(column.helper_method, record, column.field_name).to_s
      else
        record_hash[column.field_name] = record.send(column.field_name).to_s
      end
    end
    records_arr << record_hash
  end
  records_arr
end

def generate_excel(klass_name, params, helpers)
  klass = klass_name.constantize
  selected_column_names = params[:columns] || []
  # filter_params = params[:filters]
  model = CmAdmin::Model.find_by({name: klass_name})
  # records = get_records(klass, model, columns, helpers)
  records = "CmAdmin::#{klass_name}Policy::Scope".constantize.new(Current.user, klass).resolve
  filtered_data = CmAdmin::Models::Filter.filtered_data(model.filter_params(params), records, model.filters)
  formatted_data = format_records(filtered_data, model, selected_column_names, helpers)
  file_path = "#{Rails.root}/tmp/#{klass}_data_#{DateTime.now.strftime("%Y-%m-%d_%H-%M-%S")}.xlsx"
  create_workbook(model, formatted_data, selected_column_names, file_path)
  return file_path
end