class StockJournal < ApplicationRecord

  SALES_TRANS = "sale"
  STOCK_CHECK_TRANS = "stock_check"

  def self.add_to_journal(item, balance, stock_message, inventory_definition) # item => saleObj | balance => Stock journal

    balance = calculate_balance(balance, item.qty)

    journal = StockJournal.new
    journal.item_code = item.product_code
    journal.inventory_definition_id = inventory_definition.id
    journal.debit = item.qty
    journal.balance = balance
    journal.remark = stock_message
    journal.trans_ref = item.id
    journal.trans_type = StockJournal::SALES_TRANS
    journal.save
  end

  def self.calculate_balance(balance, qty)
    return balance.to_i - qty.to_i
  end

  def self.from_stock_check(item)
    definition_id = InventoryDefinition.find_by_item_code(item.item_code)
    journal = StockJournal.new
    journal.item_code = item.item_code
    journal.inventory_definition_id = definition_id.id
    journal.debit = 0
    journal.credit = item.stock_count
    journal.balance = item.stock_count
    journal.remark = StockJournal::STOCK_CHECK_TRANS
    journal.trans_ref = item.id
    journal.trans_type = StockJournal::STOCK_CHECK_TRANS
    journal.save
  end

  def self.inventory_balances(today,from,to)
    if !from.nil? && !to.nil?
      query = StockJournal.select("mii.item_instance_name as item_instance_name,balance")
            .joins("join menu_item_instances mii on mii.item_instance_code=stock_journals.item_code")
            .where("stock_journals.created_at between '#{from}' and '#{to}'")
            .group("mii.item_instance_name")
            .order("mii.item_instance_name ASC")
    else
      query = StockJournal.select("mii.item_instance_name as item_instance_name,balance")
            .joins("join menu_item_instances mii on mii.item_instance_code=stock_journals.item_code")
            .where("DATE_FORMAT(stock_journals.created_at,'%Y-%m-%d') = '#{today}'")
            .group("mii.item_instance_name")
            .order("mii.item_instance_name ASC")
    end
  end

end