# System documented in https://zulip.readthedocs.io/en/latest/subsystems/logging.html
import logging
import os
import platform
import subprocess
import traceback
from typing import Any, Dict, Optional, Protocol, runtime_checkable
from urllib.parse import SplitResult

from django.conf import settings
from django.http import HttpRequest
from django.utils.translation import override as override_language
from django.views.debug import get_exception_reporter_filter
from sentry_sdk import capture_exception

from version import ZULIP_VERSION
from zerver.lib.logging_util import find_log_caller_module
from zerver.lib.queue import queue_json_publish


def try_git_describe() -> Optional[str]:
    try:  # nocoverage
        return subprocess.check_output(
            ["git", "describe", "--tags", "--match=[0-9]*", "--always", "--dirty", "--long"],
            stderr=subprocess.PIPE,
            cwd=os.path.join(os.path.dirname(__file__), ".."),
            text=True,
        ).strip()
    except (FileNotFoundError, subprocess.CalledProcessError):  # nocoverage
        return None


def add_request_metadata(report: Dict[str, Any], request: HttpRequest) -> None:
    report["has_request"] = True

    report["path"] = request.path
    report["method"] = request.method
    report["remote_addr"] = request.META.get("REMOTE_ADDR", None)
    report["query_string"] = request.META.get("QUERY_STRING", None)
    report["server_name"] = request.META.get("SERVER_NAME", None)
    try:
        from django.contrib.auth.models import AnonymousUser

        user_profile = request.user
        if isinstance(user_profile, AnonymousUser):
            user_full_name = None
            user_email = None
            user_role = None
        else:
            user_full_name = user_profile.full_name
            user_email = user_profile.email
            with override_language(settings.LANGUAGE_CODE):
                # str() to force the lazy-translation to apply now,
                # since it won't serialize into the worker queue.
                user_role = str(user_profile.get_role_name())
    except Exception:
        # Unexpected exceptions here should be handled gracefully
        traceback.print_exc()
        user_full_name = None
        user_email = None
        user_role = None

    report["user"] = {
        "user_email": user_email,
        "user_full_name": user_full_name,
        "user_role": user_role,
    }

    exception_filter = get_exception_reporter_filter(request)
    try:
        report["data"] = (
            exception_filter.get_post_parameters(request)
            if request.method == "POST"
            else request.GET
        )
    except Exception:
        # exception_filter.get_post_parameters will throw
        # RequestDataTooBig if there's a really big file uploaded
        report["data"] = {}

    try:
        report["host"] = SplitResult("", request.get_host(), "", "", "").hostname
    except Exception:
        # request.get_host() will throw a DisallowedHost
        # exception if the host is invalid
        report["host"] = platform.node()


@runtime_checkable
class HasRequest(Protocol):
    request: HttpRequest


class AdminNotifyHandler(logging.Handler):
    """An logging handler that sends the log/exception to the queue to be
    turned into an email and/or a Zulip message for the server admins.
    """

    # adapted in part from django/utils/log.py

    def __init__(self) -> None:
        logging.Handler.__init__(self)

    def emit(self, record: logging.LogRecord) -> None:
        report: Dict[str, Any] = {}

        try:
            report["node"] = platform.node()
            report["host"] = platform.node()

            report["deployment_data"] = dict(
                git=try_git_describe(),
                ZULIP_VERSION=ZULIP_VERSION,
            )

            if record.exc_info:
                stack_trace = "".join(traceback.format_exception(*record.exc_info))
                message = str(record.exc_info[1])
            else:
                stack_trace = "No stack trace available"
                message = record.getMessage()
                if "\n" in message:
                    # Some exception code paths in queue processors
                    # seem to result in super-long messages
                    stack_trace = message
                    message = message.split("\n")[0]
            report["stack_trace"] = stack_trace
            report["message"] = message

            report["logger_name"] = record.name
            report["log_module"] = find_log_caller_module(record)
            report["log_lineno"] = record.lineno

            if isinstance(record, HasRequest):
                add_request_metadata(report, record.request)

        except Exception:
            report["message"] = "Exception in preparing exception report!"
            logging.warning(report["message"], exc_info=True)
            report["stack_trace"] = "See /var/log/zulip/errors.log"
            capture_exception()

        if settings.DEBUG_ERROR_REPORTING:  # nocoverage
            logging.warning("Reporting an error to admins...")
            logging.warning(
                "Reporting an error to admins: %s %s %s %s %s",
                record.levelname,
                report["logger_name"],
                report["log_module"],
                report["message"],
                report["stack_trace"],
            )

        try:
            queue_json_publish(
                "error_reports",
                dict(
                    type="server",
                    report=report,
                ),
            )
        except Exception:
            # If this breaks, complain loudly but don't pass the traceback up the stream
            # However, we *don't* want to use logging.exception since that could trigger a loop.
            logging.warning("Reporting an exception triggered an exception!", exc_info=True)
            capture_exception()