#
# Copyright (C) 2014 GNS3 Technologies Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

try:
    import sentry_sdk
    from sentry_sdk.integrations.logging import LoggingIntegration

    SENTRY_SDK_AVAILABLE = True
except ImportError:
    # Sentry SDK is not installed with deb package in order to simplify packaging
    SENTRY_SDK_AVAILABLE = False

import os
import sys
import struct
import platform
import locale
import distro

from .version import __version__, __version_info__
from .config import Config
from .utils.get_resource import get_resource

import logging

log = logging.getLogger(__name__)


# Dev build
if __version_info__[3] != 0:
    import faulthandler

    # Display a traceback in case of segfault crash.
    # Useful when this application is frozen.
    # Not enabled by default for security reason
    log.info("Enable catching segfault")
    try:
        faulthandler.enable()
    except Exception:
        pass  # Could fail when loaded into tests


class CrashReport:

    """
    Report crash to a third party service
    """

    DSN = "https://bad2bd9ef9f14c8d9239d6f815ed453f@o19455.ingest.sentry.io/38482"
    _instance = None

    def __init__(self):

        # We don't want sentry making noise if an error is caught when you don't have internet
        sentry_errors = logging.getLogger("sentry.errors")
        sentry_errors.disabled = True

        sentry_uncaught = logging.getLogger("sentry.errors.uncaught")
        sentry_uncaught.disabled = True

        if SENTRY_SDK_AVAILABLE:
            cacert = None
            if hasattr(sys, "frozen"):
                cacert_resource = get_resource("cacert.pem")
                if cacert_resource is not None and os.path.isfile(cacert_resource):
                    cacert = cacert_resource
                else:
                    log.error(f"The SSL certificate bundle file '{cacert_resource}' could not be found")

            # Don't send log records as events.
            sentry_logging = LoggingIntegration(level=logging.INFO, event_level=None)

            sentry_sdk.init(
                dsn=CrashReport.DSN,
                release=__version__,
                ca_certs=cacert,
                default_integrations=False,
                integrations=[sentry_logging],
            )

            tags = {
                "os:name": platform.system(),
                "os:release": platform.release(),
                "os:win_32": " ".join(platform.win32_ver()),
                "os:mac": f"{platform.mac_ver()[0]} {platform.mac_ver()[2]}",
                "os:linux": " ".join(distro.linux_distribution()),
            }

            with sentry_sdk.configure_scope() as scope:
                for key, value in tags.items():
                    scope.set_tag(key, value)

            extra_context = {
                "python:version": "{}.{}.{}".format(sys.version_info[0], sys.version_info[1], sys.version_info[2]),
                "python:bit": struct.calcsize("P") * 8,
                "python:encoding": sys.getdefaultencoding(),
                "python:frozen": "{}".format(hasattr(sys, "frozen")),
            }

            if sys.platform.startswith("linux") and not hasattr(sys, "frozen"):
                # add locale information
                try:
                    language, encoding = locale.getlocale()
                    extra_context["locale:language"] = language
                    extra_context["locale:encoding"] = encoding
                except ValueError:
                    pass

                # add GNS3 VM version if it exists
                home = os.path.expanduser("~")
                gns3vm_version = os.path.join(home, ".config", "GNS3", "gns3vm_version")
                if os.path.isfile(gns3vm_version):
                    try:
                        with open(gns3vm_version) as fd:
                            extra_context["gns3vm:version"] = fd.readline().strip()
                    except OSError:
                        pass

            with sentry_sdk.configure_scope() as scope:
                for key, value in extra_context.items():
                    scope.set_extra(key, value)

    def capture_exception(self, request=None):

        if not SENTRY_SDK_AVAILABLE:
            return

        if not hasattr(sys, "frozen") and os.path.exists(
            os.path.join(os.path.dirname(os.path.abspath(__file__)), "..", ".git")
        ):
            log.warning(".git directory detected, crash reporting is turned off for developers.")
            return

        if Config.instance().settings.Server.report_errors:

            if not SENTRY_SDK_AVAILABLE:
                log.warning("Cannot capture exception: Sentry SDK is not available")
                return

            if os.path.exists(".git"):
                log.warning(".git directory detected, crash reporting is turned off for developers.")
                return

            try:
                if request:
                    # add specific extra request information
                    with sentry_sdk.push_scope() as scope:
                        scope.set_extra("method", request.method)
                        scope.set_extra("url", request.path)
                        scope.set_extra("json", request.json)
                        sentry_sdk.capture_exception()
                else:
                    sentry_sdk.capture_exception()
                log.info(f"Crash report sent with event ID: {sentry_sdk.last_event_id()}")
            except Exception as e:
                log.warning(f"Can't send crash report to Sentry: {e}")

    @classmethod
    def instance(cls):
        if cls._instance is None:
            cls._instance = CrashReport()
        return cls._instance