# Copyright (c) 2015 Intel Corporation

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# furnished to do so, subject to the following conditions:

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# all copies or substantial portions of the Software.

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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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"""Exception and error classes for piglit, and exception handlers."""

from __future__ import print_function, absolute_import, division
import os
import sys
import functools

__all__ = [
    'PiglitInternalError',
    'PiglitFatalError',
    'PiglitException',
    'handler',
]

_DEBUG = bool(os.environ.get('PIGLIT_DEBUG', False))


def handler(func):
    """Decorator function for handling errors in an entry point.

    This will handle expected errors (PiglitFatalError), and unexpected errors,
    either PiglitInternalErrors or PiglitExceptions, as well as handling
    generic Exceptions

    """

    @functools.wraps(func)
    def _inner(*args, **kwargs):
        try:
            func(*args, **kwargs)
        except PiglitFatalError as e:
            print('Fatal Error: {}'.format(str(e)), file=sys.stderr)
            sys.exit(1)
        except (PiglitInternalError, PiglitException) as e:
            print('Warning: An internal exception that should have '
                  'been handled was not. This is bug and should be reported.\n'
                  'BUG: {}'.format(str(e)),
                  file=sys.stderr)
            if _DEBUG:
                raise
            sys.exit(1)
        except Exception as e:  # pylint: disable=broad-except
            print('Warning: A python exception that should have '
                  'been handled was not. This is bug and should be reported.\n'
                  'BUG: {}'.format(str(e)),
                  file=sys.stderr)
            if _DEBUG:
                raise
            sys.exit(1)

    return _inner


class PiglitException(Exception):
    """Class for non-error exceptions.

    These should *always* be caught. If this class (or any subclass) is
    uncaught that is a bug in piglit.

    """


class PiglitInternalError(Exception):
    """Class for errors in piglit.

    These should always be handled.

    """


class PiglitFatalError(Exception):
    """Class for errors in piglit that cannot be recovered from.

    When this class (or a subclass) is raised it should be raised all the way
    to the top of the program where it exits.

    """