#!/usr/bin/env python3
"""
The bot's database connection class.
"""
import os
import sqlite3
import threading

import config

class FulviaDB:
	"""
	Defines a basic interface and some convenience functionsfor the bot's
	database.
	"""
	def __init__(self):
		path = config.db_filename
		self.filename = path
		self.db_lock = threading.Lock()

	def connect(self):
		"""Return a raw database connection object."""
		return sqlite3.connect(self.filename,
				timeout=10,
				detect_types=sqlite3.PARSE_DECLTYPES)

	def execute(self, *args, **kwargs):
		"""
		Execute an arbitrary SQL query against the database.

		Returns a cursor object, on which things like `.fetchall()` can be
		called per PEP 249.
		"""
		with self.connect() as conn:
			self.db_lock.acquire()
			cur = conn.cursor()
			res = cur.execute(*args, **kwargs)
			self.db_lock.release()
			return res