import datetime

import transaction
import data_checker


class DataMgr:

	TR_MAX_CNT = 500
	TR_MAINTAIN_CNT = 100

	def __init__(self):
		self.transactions = []
		self.data_checker = data_checker.DataChecker()

	def contains(self, tr: transaction.Transaction):
		next_item = next((i for i, x in enumerate(self.transactions) if x.key == tr.key), None)
		return (next_item is not None)

	def insert(self, item):
		tr = transaction.Transaction(item)
		if self.contains(tr):
			return False

		self.data_checker.add(tr)
		self.transactions.append(tr)

		if len(self.transactions) >= DataMgr.TR_MAX_CNT:
			today = datetime.datetime.now().strftime('%Y-%m-%d')
			with open('log/log-{}.txt'.format(today), 'a') as log_file:
				for key in self.transactions[:-DataMgr.TR_MAINTAIN_CNT]:
					log_file.write('{}\n'.format(self.transactions[key]))

			self.transactions = self.transactions[-DataMgr.TR_MAINTAIN_CNT:]

		return True