# Copyright (C) 2010-2023 RhodeCode GmbH
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License, version 3
# (only), as published by the Free Software Foundation.
#
# 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 Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# This program is dual-licensed. If you wish to learn more about the
# RhodeCode Enterprise Edition, including its added features, Support services,
# and proprietary license terms, please see https://rhodecode.com/licenses/

import io
import os
import time
import sys
import datetime
import msgpack
import logging
import traceback
import tempfile
import glob

log = logging.getLogger(__name__)

# NOTE: Any changes should be synced with exc_tracking at vcsserver.lib.exc_tracking
global_prefix = "rhodecode"
exc_store_dir_name = "rc_exception_store_v1"


def exc_serialize(exc_id, tb, exc_type, extra_data=None):
    data = {
        "version": "v1",
        "exc_id": exc_id,
        "exc_utc_date": datetime.datetime.utcnow().isoformat(),
        "exc_timestamp": repr(time.time()),
        "exc_message": tb,
        "exc_type": exc_type,
    }
    if extra_data:
        data.update(extra_data)
    return msgpack.packb(data), data


def exc_unserialize(tb):
    return msgpack.unpackb(tb)


_exc_store = None


def maybe_send_exc_email(exc_id, exc_type_name, send_email):
    from pyramid.threadlocal import get_current_request
    import rhodecode as app

    request = get_current_request()

    if send_email is None:
        # NOTE(marcink): read app config unless we specify explicitly
        send_email = app.CONFIG.get("exception_tracker.send_email", False)

    mail_server = app.CONFIG.get("smtp_server") or None
    send_email = send_email and mail_server
    if send_email and request:
        try:
            send_exc_email(request, exc_id, exc_type_name)
        except Exception:
            log.exception("Failed to send exception email")
            exc_info = sys.exc_info()
            store_exception(id(exc_info), exc_info, send_email=False)


def send_exc_email(request, exc_id, exc_type_name):
    import rhodecode as app
    from rhodecode.apps._base import TemplateArgs
    from rhodecode.lib.utils2 import aslist
    from rhodecode.lib.celerylib import run_task, tasks
    from rhodecode.lib.base import attach_context_attributes
    from rhodecode.model.notification import EmailNotificationModel

    recipients = aslist(app.CONFIG.get("exception_tracker.send_email_recipients", ""))
    log.debug("Sending Email exception to: `%s`", recipients or "all super admins")

    # NOTE(marcink): needed for email template rendering
    user_id = None
    if hasattr(request, "user"):
        user_id = request.user.user_id
    attach_context_attributes(TemplateArgs(), request, user_id=user_id, is_api=True)

    email_kwargs = {
        "email_prefix": app.CONFIG.get("exception_tracker.email_prefix", "")
        or "[RHODECODE ERROR]",
        "exc_url": request.route_url(
            "admin_settings_exception_tracker_show", exception_id=exc_id
        ),
        "exc_id": exc_id,
        "exc_type_name": exc_type_name,
        "exc_traceback": read_exception(exc_id, prefix=None),
    }

    (subject, email_body, email_body_plaintext) = EmailNotificationModel().render_email(
        EmailNotificationModel.TYPE_EMAIL_EXCEPTION, **email_kwargs
    )

    run_task(tasks.send_email, recipients, subject, email_body_plaintext, email_body)


def get_exc_store():
    """
    Get and create exception store if it's not existing
    """
    global _exc_store

    if _exc_store is not None:
        # quick global cache
        return _exc_store

    import rhodecode as app

    exc_store_dir = (
        app.CONFIG.get("exception_tracker.store_path", "") or tempfile.gettempdir()
    )
    _exc_store_path = os.path.join(exc_store_dir, exc_store_dir_name)

    _exc_store_path = os.path.abspath(_exc_store_path)
    if not os.path.isdir(_exc_store_path):
        os.makedirs(_exc_store_path)
        log.debug("Initializing exceptions store at %s", _exc_store_path)
        _exc_store = _exc_store_path

    return _exc_store_path


def get_detailed_tb(exc_info):
    try:
        from pip._vendor.rich import (
            traceback as rich_tb,
            scope as rich_scope,
            console as rich_console,
        )
    except ImportError:
        try:
            from rich import (
                traceback as rich_tb,
                scope as rich_scope,
                console as rich_console,
            )
        except ImportError:
            return None

    console = rich_console.Console(width=160, file=io.StringIO())

    exc = rich_tb.Traceback.extract(*exc_info, show_locals=True)

    tb_rich = rich_tb.Traceback(
        trace=exc,
        width=160,
        extra_lines=3,
        theme=None,
        word_wrap=False,
        show_locals=False,
        max_frames=100,
    )

    # last_stack = exc.stacks[-1]
    # last_frame = last_stack.frames[-1]
    # if last_frame and last_frame.locals:
    #     console.print(
    #         rich_scope.render_scope(
    #             last_frame.locals,
    #             title=f'{last_frame.filename}:{last_frame.lineno}'))

    console.print(tb_rich)
    formatted_locals = console.file.getvalue()

    return formatted_locals


def get_request_metadata(request=None) -> dict:
    request_metadata = {}
    if not request:
        from pyramid.threadlocal import get_current_request

        request = get_current_request()

    # NOTE(marcink): store request information into exc_data
    if request:
        request_metadata["client_address"] = getattr(request, "client_addr", "")
        request_metadata["user_agent"] = getattr(request, "user_agent", "")
        request_metadata["method"] = getattr(request, "method", "")
        request_metadata["url"] = getattr(request, "url", "")
    return request_metadata


def format_exc(exc_info, use_detailed_tb=True):
    exc_type, exc_value, exc_traceback = exc_info
    tb = "++ TRACEBACK ++\n\n"
    if isinstance(exc_traceback, str):
        tb += exc_traceback
        use_detailed_tb = False
    else:
        tb += "".join(traceback.format_exception(exc_type, exc_value, exc_traceback, None))

    if use_detailed_tb:
        locals_tb = get_detailed_tb(exc_info)
        if locals_tb:
            tb += f"\n+++ DETAILS +++\n\n{locals_tb}\n" ""
    return tb


def _store_exception(exc_id, exc_info, prefix, request_path='', send_email=None):
    """
    Low level function to store exception in the exception tracker
    """

    extra_data = {}
    extra_data.update(get_request_metadata())

    exc_type, exc_value, exc_traceback = exc_info
    tb = format_exc(exc_info)

    exc_type_name = exc_type.__name__
    exc_data, org_data = exc_serialize(exc_id, tb, exc_type_name, extra_data=extra_data)

    exc_pref_id = f"{exc_id}_{prefix}_{org_data['exc_timestamp']}"
    exc_store_path = get_exc_store()
    if not os.path.isdir(exc_store_path):
        os.makedirs(exc_store_path)
    stored_exc_path = os.path.join(exc_store_path, exc_pref_id)
    with open(stored_exc_path, "wb") as f:
        f.write(exc_data)
    log.debug("Stored generated exception %s as: %s", exc_id, stored_exc_path)

    if request_path:
        log.error(
            'error occurred handling this request.\n'
            'Path: `%s`, %s',
            request_path, tb)

    maybe_send_exc_email(exc_id, exc_type_name, send_email)


def store_exception(exc_id, exc_info, prefix=global_prefix, request_path='', send_email=None):
    """
    Example usage::

        exc_info = sys.exc_info()
        store_exception(id(exc_info), exc_info)
    """

    try:
        exc_type = exc_info[0]
        exc_type_name = exc_type.__name__

        _store_exception(
            exc_id=exc_id, exc_info=exc_info, prefix=prefix, request_path=request_path,
            send_email=send_email
        )
        return exc_id, exc_type_name
    except Exception:
        log.exception("Failed to store exception `%s` information", exc_id)
        # there's no way this can fail, it will crash server badly if it does.
        pass


def _find_exc_file(exc_id, prefix=global_prefix):
    exc_store_path = get_exc_store()
    if prefix:
        exc_id = f"{exc_id}_{prefix}"
    else:
        # search without a prefix
        exc_id = f"{exc_id}"

    found_exc_id = None
    matches = glob.glob(os.path.join(exc_store_path, exc_id) + "*")
    if matches:
        found_exc_id = matches[0]

    return found_exc_id


def _read_exception(exc_id, prefix):
    exc_id_file_path = _find_exc_file(exc_id=exc_id, prefix=prefix)
    if exc_id_file_path:
        with open(exc_id_file_path, "rb") as f:
            return exc_unserialize(f.read())
    else:
        log.debug("Exception File `%s` not found", exc_id_file_path)
    return None


def read_exception(exc_id, prefix=global_prefix):
    try:
        return _read_exception(exc_id=exc_id, prefix=prefix)
    except Exception:
        log.exception("Failed to read exception `%s` information", exc_id)
        # there's no way this can fail, it will crash server badly if it does.
    return None


def delete_exception(exc_id, prefix=global_prefix):
    try:
        exc_id_file_path = _find_exc_file(exc_id, prefix=prefix)
        if exc_id_file_path:
            os.remove(exc_id_file_path)

    except Exception:
        log.exception("Failed to remove exception `%s` information", exc_id)
        # there's no way this can fail, it will crash server badly if it does.
        pass


def generate_id():
    return id(object())