"""Application error handling."""
import logging
import traceback

import MySQLdb as mdb
from flask import Flask, render_template

def handle_general_exception(exc: Exception):
    trace = traceback.format_exc()
    logging.error("Error: Generic unhandled exception!!\n%s", trace)
    return render_template("unhandled_exception.html", trace=trace)

def handle_general_MySQLdb_errors(exc: mdb.MySQLError):
    trace = traceback.format_exc()
    logging.error("MySQLError: Generic MySQL Error!!\n%s", trace)
    return render_template("unhandled_exception.html", trace=trace)

def register_error_handlers(app: Flask):
    """Register top-level error/exception handlers."""
    app.register_error_handler(Exception, handle_general_exception)
    app.register_error_handler(mdb.MySQLError, handle_general_exception)