import os
import sqlite3
import tempfile
import zipfile
from json import loads as json_loads

from .loader import Loader

DB_FILE = "instance_log.sqlite"


class SQLiteLoader(Loader):
	conn = None

	def load(self, file: str):
		self.conn = sqlite3.connect(file)

	def get_entry(self) -> dict:
		cursor = self.conn.cursor()
		cursor.execute("SELECT * FROM log_entry")
		for seq, timestamp, json in cursor.fetchall():
			yield json_loads(json)


class ZipSQLiteLoader(SQLiteLoader):
	def load(self, file: str):
		with zipfile.ZipFile(file, "r") as zipped_log, tempfile.TemporaryDirectory() as tmp:
			zipped_log.extract(DB_FILE, path=tmp)
			super(ZipSQLiteLoader, self).load(os.path.join(tmp, DB_FILE))