import re
from typing import TYPE_CHECKING

import sentry_sdk
from sentry_sdk.integrations import Integration
from sentry_sdk.scope import add_global_event_processor
from sentry_sdk.utils import capture_internal_exceptions

if TYPE_CHECKING:
    from typing import Any

    from sentry_sdk._types import Event

# function is everything between index at @
# and then we match on the @ plus the hex val
FUNCTION_RE = r"[^@]+?"
HEX_ADDRESS = r"\s+@\s+0x[0-9a-fA-F]+"

_FRAME_RE_PATTERN = r"""
^(?P<index>\d+)\.\s+(?P<function>{FUNCTION_RE}){HEX_ADDRESS}(?:\s+in\s+(?P<package>.+))?$
""".format(
    FUNCTION_RE=FUNCTION_RE,
    HEX_ADDRESS=HEX_ADDRESS,
)

FRAME_RE = re.compile(_FRAME_RE_PATTERN, re.MULTILINE | re.VERBOSE)


class GnuBacktraceIntegration(Integration):
    identifier = "gnu_backtrace"

    @staticmethod
    def setup_once() -> None:
        @add_global_event_processor
        def process_gnu_backtrace(event: "Event", hint: "dict[str, Any]") -> "Event":
            with capture_internal_exceptions():
                return _process_gnu_backtrace(event, hint)


def _process_gnu_backtrace(event: "Event", hint: "dict[str, Any]") -> "Event":
    if sentry_sdk.get_client().get_integration(GnuBacktraceIntegration) is None:
        return event

    exc_info = hint.get("exc_info", None)

    if exc_info is None:
        return event

    exception = event.get("exception", None)

    if exception is None:
        return event

    values = exception.get("values", None)

    if values is None:
        return event

    for exception in values:
        frames = exception.get("stacktrace", {}).get("frames", [])
        if not frames:
            continue

        msg = exception.get("value", None)
        if not msg:
            continue

        additional_frames = []
        new_msg = []

        for line in msg.splitlines():
            match = FRAME_RE.match(line)
            if match:
                additional_frames.append(
                    (
                        int(match.group("index")),
                        {
                            "package": match.group("package") or None,
                            "function": match.group("function") or None,
                            "platform": "native",
                        },
                    )
                )
            else:
                # Put garbage lines back into message, not sure what to do with them.
                new_msg.append(line)

        if additional_frames:
            additional_frames.sort(key=lambda x: -x[0])
            for _, frame in additional_frames:
                frames.append(frame)

            new_msg.append("<stacktrace parsed and removed by GnuBacktraceIntegration>")
            exception["value"] = "\n".join(new_msg)

    return event
