class TableEntry
	include Mongoid::Document
	include Mongoid::Timestamps
	include Slug

  	attr_accessor :sort_value
  	field :sort_number, type: Integer

	has_many :column_entries, :dependent => :destroy
	belongs_to :u_table, :dependent => :destroy, index: true

	accepts_nested_attributes_for :column_entries, :allow_destroy => true
	
	before_save do
		if self[:sort_number].nil?
			sort_number_to_set = self.class.where(u_table_id: self.u_table_id).order_by(sort_number: :desc).first.sort_number rescue 0
			self.sort_number = sort_number_to_set + 1
		end
	end

	def self.u_table
		UTable.find(criteria.selector['u_table_id'])
	end

	def self.sorting(params: nil,table: nil,field: nil,direction: nil,page_num: nil,per: nil,column_entries: nil,paginated: true)
		page_num = 1 if page_num.blank?
		page_num = page_num.to_i
		if table.nil?
			table = u_table
		end
		if field.nil? || direction.nil?
			if !params[:sortcolumn].blank?
				field = params[:sortcolumn]
				direction = params[:sort]
			else
				field = params[:sort].blank? ? nil : params[:sort]
				direction = params[:order].blank? ? 'desc' : params[:order]
			end
			if field.nil?
				field,direction = table.default_ordered
			else
				field = field.to_s
				if !(field=='created_at' || field == 'sort_number')
					field = table.table_columns.where(key: field).first || table.table_columns.where(title: field).first
				end
			end
		end
		
		if (field=='created_at' || field == 'sort_number')
			if column_entries.nil?
				values = self.order_by({field => direction})
			else
				values = column_entries.map{|v| v.table_entry}.compact
				values = values.sort_by{|v| v.send(field)}
				if direction == 'desc'
					values = values.reverse
				end
				if paginated || !per.nil?
					values_count = values.count
					values_count = 1 if values_count==0
					values =  Kaminari.paginate_array(values,limit: values_count)
				end
			end
			if !per.nil?
				values = values.page(page_num).per(per)
			end
		else
			column_to_sort = field
			if column_entries.nil?
				if criteria.selector.keys != ['u_table_id']
					column_entries = ColumnEntry.where(:table_column_id=>column_to_sort.id,:table_entry_id.in => criteria.pluck(:id)).order_by(column_to_sort.sort_hash(direction))
				else
					column_entries = ColumnEntry.where(:table_column_id=>column_to_sort.id).order_by(column_to_sort.sort_hash(direction))
				end
			else
				column_entries = ColumnEntry.where(:table_column_id=>column_to_sort.id,:table_entry_id.in => (column_entries.class==Kaminari::PaginatableArray ? column_entries.map(&:table_entry_id) : column_entries.pluck(:table_entry_id))).order_by(column_to_sort.sort_hash(direction))
			end
			if !per.nil?
				total_count = column_entries.count
				column_entries = column_entries.page(page_num).per(per)
				offset = page_num==0 ? 0 : (page_num-1)*per
				end_offset = (total_count-offset-per)
				end_offset = 0 if end_offset<0
				values = Kaminari.paginate_array([nil]*offset+column_entries.map{|v| v.table_entry}+[nil]*end_offset).page(page_num).per(per)
			else
				values = column_entries.map{|v| v.table_entry}
				if paginated
					values = Kaminari.paginate_array(values)
				end
			end
		end
		values
	end
end