import sqlite3
from pathlib import Path
import math

def power(x, y):
    return math.pow(x, y)



class Database:
    def __init__(self, db_path=None):
        if db_path is None:
            raise ValueError("db_path must be provided")
        self.db_path = db_path
        self.db_file = self.db_path / "models.db"
        if not self.db_file.exists():
            print("Creating database")
            print("DB_FILE", self.db_file)
            db = sqlite3.connect(self.db_file)
            with open(Path("schema.sql"), "r") as f:
                db.executescript(f.read())
            db.commit()
            db.close()

    def get_db(self):
        db = sqlite3.connect(self.db_file, check_same_thread=False)
        db.create_function("MYPOWER", 2, power)
        db.row_factory = sqlite3.Row
        return db

    def __enter__(self):
        self.db = self.get_db()
        return self.db

    def __exit__(self, exc_type, exc_value, traceback):
        self.db.close()