import traceback

from flask import request
from flask.app import Flask
import ldap3
from werkzeug.exceptions import HTTPException

from ceo_common.errors import UserNotFoundError, GroupNotFoundError, \
    UserAlreadyExistsError, GroupAlreadyExistsError, BadRequest, \
    UserAlreadySubscribedError, InvalidMembershipError, \
    CloudStackAPIError, InvalidDomainError, InvalidIPError
from ceo_common.logger_factory import logger_factory

__all__ = ['register_error_handlers']
logger = logger_factory(__name__)


def register_error_handlers(app: Flask):
    """Register error handlers for the application."""
    app.register_error_handler(Exception, generic_error_handler)


def generic_error_handler(err: Exception):
    """Return JSON for all errors."""
    if isinstance(err, HTTPException):
        status_code = err.code
    elif any(isinstance(err, cls) for cls in [
        BadRequest, InvalidDomainError, InvalidIPError
    ]):
        status_code = 400
    elif isinstance(err, ldap3.core.exceptions.LDAPStrongerAuthRequiredResult) \
            or isinstance(err, InvalidMembershipError):
        status_code = 403
    elif isinstance(err, UserNotFoundError) or isinstance(err, GroupNotFoundError):
        status_code = 404
    elif any(isinstance(err, cls) for cls in [
        UserAlreadyExistsError, GroupAlreadyExistsError, UserAlreadySubscribedError
    ]):
        status_code = 409
    elif isinstance(err, CloudStackAPIError):
        status_code = 500
    else:
        status_code = 500
        logger.error(traceback.format_exc())
        if request.path.startswith('/api/cloud'):
            # I've noticed that the requests library spits out the
            # full URL when an Exception is raised, which will cause
            # our CloudStack API key to be leaked. So we're going to mask
            # it here instead.
            err = Exception('Please contact the Systems Committee')
    return {'error': type(err).__name__ + ': ' + str(err)}, status_code