#!/usr/bin/env python
from sentry.runner import configure

configure()

import datetime
import random
from uuid import uuid4

import click
import requests
from django.utils import timezone

from sentry import options
from sentry.models import Organization, Project, ProjectKey, Release
from sentry.snuba.metrics.naming_layer.mri import SessionMRI
from sentry.utils import json

abnormal_mechanism_choices = (
    "anr_background",
    "anr_foreground",
)

session_status = ["ok", "exited", "crashed", "abnormal"]
session_status_weights = [0.5, 0.05, 0.05, 0.40]

type_map = {
    "set": "s",
    "counter": "c",
    "distribution": "d",
}


def generate_session(
    id: str,
    user_id: str,
    time: datetime.datetime,
    env: str,
    release: str,
    init: bool,
):
    abnormal_mechanism = random.choice(abnormal_mechanism_choices)
    status = random.choices(session_status, session_status_weights)[0]
    return {
        "sid": id,
        "did": user_id,
        "init": init,
        "started": time.isoformat(),
        "duration": random.randrange(10, 90),
        "error": 1 if status == "abnormal" else 0,
        "status": "ok" if init else status,
        "abnormal_mechanism": abnormal_mechanism if status == "abnormal" else None,
        "attrs": {
            "environment": env,
            "release": release,
        },
    }


def send_session(session, project, project_key):
    envelope = ["{}", '{"type":"session"}', json.dumps(session)]
    payload = "\n".join(envelope)

    host = "http://127.0.0.1:8000"

    url = f"{host}/api/{project.id}/envelope/?sentry_key={project_key.public_key}&sentry_version=7&sentry_client=sentry.curl/1.1.1"
    headers = {
        "content-type": "application/json",
    }
    response = requests.post(url, payload, headers=headers)
    return response


def convert_session_to_metrics(organization: Organization, project: Project, session):
    """
    Convert a session to metrics
    Shamelessly stolen from sentry.testutils.cases.BaseMetricsTestCase::store_session

    Mimic relays behavior of always emitting a metric for a started session,
    and emitting an additional one if the session is fatal

    See https://github.com/getsentry/relay/blob/e3c064e213281c36bde5d2b6f3032c6d36e22520/relay-server/src/actors/envelopes.rs#L357
    """
    user = session.get("distinct_id")
    base_tags = session.get("attrs")

    # This check is not yet reflected in relay, see https://getsentry.atlassian.net/browse/INGEST-464
    user_is_nil = user is None or user == "00000000-0000-0000-0000-000000000000"

    def generate_metric(type, mri: str, tags, value):
        short_type = type_map[type]
        return {
            "org_id": organization.id,
            "project_id": project.id,
            "type": short_type,
            "name": mri,
            "value": value,
            "timestamp": session.get("started"),
            "tags": {**tags, **base_tags},
        }

    if session["init"] is True:  # init
        yield generate_metric("counter", SessionMRI.SESSION.value, {"session.status": "init"}, +1)

    status = session["status"]

    # Mark the session as errored, which includes fatal sessions.
    if session.get("errors", 0) > 0 or status not in ("ok", "exited"):
        yield generate_metric("set", SessionMRI.ERROR.value, {}, session["sid"])
        if not user_is_nil:
            yield generate_metric("set", SessionMRI.USER.value, {"session.status": "errored"}, user)
    elif not user_is_nil:
        yield generate_metric("set", SessionMRI.USER.value, {}, user)

    if status in ("abnormal", "crashed"):  # fatal
        yield generate_metric("counter", SessionMRI.SESSION.value, {"session.status": status}, +1)
        if not user_is_nil:
            yield generate_metric("set", SessionMRI.USER.value, {"session.status": status}, user)

    if status == "exited":
        if session["duration"] is not None:
            yield generate_metric(
                "distribution",
                SessionMRI.RAW_DURATION.value,
                {"session.status": status},
                session["duration"],
            )


@click.command()
@click.option("--project", type=str, help="Project slug to insert data into", default="internal")
@click.option("--org", type=str, help="Organization slug to insert data into", default="sentry")
@click.option(
    "--release", type=str, help="Release name. Defaults to the most recent release in the project."
)
@click.option("--env", type=str, help="Environment to generate sessions for", default="dev")
@click.option("--days", type=int, help="Number of days to generate data for", default=5)
def main(project, org, env, days, release=None):
    click.echo("Mocking sessions for {project} in {org}")
    options.set("sentry-metrics.releasehealth.abnormal-mechanism-extraction-rate", 1.0)
    try:
        organization = Organization.objects.get(slug=org)
    except Organization.DoesNotExist:
        raise RuntimeError("! Organization does not exist")
    try:
        project = Project.objects.get(slug=project, organization=organization)
    except Project.DoesNotExist:
        raise RuntimeError("! Project does not exist")

    project_key = ProjectKey.objects.filter(project=project)[0]
    if not project_key:
        raise RuntimeError(f"! Could not find a DSN for {project.slug}")

    if release is None:
        release = (
            Release.objects.filter(projects=project, organization=organization)
            .order_by("-date_added")[0]
            .version
        )
    if not release:
        release = Release.objects.create(
            projects=project, organization=organization, version="session-data"
        ).version

    click.echo(f"> Generating sessions for {days} day(s)")
    start = timezone.now()
    end = start - datetime.timedelta(days=days)
    current = start
    while current >= end:
        current = current - datetime.timedelta(hours=1)
        id = str(uuid4().hex)
        did = str(uuid4().hex)
        session = generate_session(id, did, current, env, release, True)
        response = send_session(session, project, project_key)
        session = generate_session(id, did, current, env, release, False)
        response = send_session(session, project, project_key)
        if response.status_code != 200:
            click.echo(f"Response failed {response}")

    click.echo("> Complete! generated session records")


if __name__ == "__main__":
    main()