import mysql.connector
from mysql.connector import pooling
import threading

MYSQL_CONFIG = {
	"host": "localhost",
	"user": "florian",
	"password": "password123++",
	"database": "app"
}

# Lock to ensure thread-safe pool creation
_pool_lock = threading.Lock()
_connection_pool = None

def get_connection_pool():
	global _connection_pool
	with _pool_lock:
		if _connection_pool is None:
			_connection_pool = mysql.connector.pooling.MySQLConnectionPool(
				pool_name="mypool",
				pool_size=5,
				pool_reset_session=True,
				**MYSQL_CONFIG
			)
	return _connection_pool

# Dependency for FastAPI
def get_db():
	pool = get_connection_pool()
	conn = pool.get_connection()
	try:
		yield conn
	finally:
		conn.close()

if __name__ == "__main__":
	# Manual test
	for conn in get_db():
		cursor = conn.cursor(dictionary=True)
		cursor.execute("SELECT NOW() AS ts")
		print(cursor.fetchone())