import time
from copy import deepcopy
from datetime import timedelta, timezone
from unittest.mock import patch
from uuid import uuid4

import pytest
from django.utils.timezone import now

from sentry.issues.grouptype import PerformanceNPlusOneGroupType
from sentry.models import Rule
from sentry.rules.conditions.event_frequency import (
    EventFrequencyCondition,
    EventFrequencyPercentCondition,
    EventUniqueUserFrequencyCondition,
)
from sentry.testutils.cases import PerformanceIssueTestCase, RuleTestCase, SnubaTestCase
from sentry.testutils.helpers.datetime import before_now, freeze_time, iso_format
from sentry.testutils.silo import region_silo_test
from sentry.testutils.skips import requires_snuba
from sentry.utils.samples import load_data

pytestmark = [requires_snuba]


@pytest.mark.snuba_ci
class FrequencyConditionMixin:
    def increment(self, event, count, environment=None, timestamp=None):
        raise NotImplementedError

    def _run_test(self, minutes, data, passes, add_events=False):
        if not self.environment:
            self.environment = self.create_environment(name="prod")

        rule = self.get_rule(data=data, rule=Rule(environment_id=None))
        environment_rule = self.get_rule(data=data, rule=Rule(environment_id=self.environment.id))

        event = self.add_event(
            data={
                "fingerprint": ["something_random"],
                "user": {"id": uuid4().hex},
            },
            project_id=self.project.id,
            timestamp=before_now(minutes=minutes),
        )
        if add_events:
            self.increment(
                event,
                data["value"] + 1,
                environment=self.environment.name,
                timestamp=now() - timedelta(minutes=minutes),
            )
            self.increment(
                event,
                data["value"] + 1,
                timestamp=now() - timedelta(minutes=minutes),
            )

        if passes:
            self.assertPasses(rule, event)
            self.assertPasses(environment_rule, event)
        else:
            self.assertDoesNotPass(rule, event)
            self.assertDoesNotPass(environment_rule, event)


class ErrorEventMixin:
    def add_event(self, data, project_id, timestamp):
        data["timestamp"] = iso_format(timestamp)
        # Store an error event
        event = self.store_event(
            data=data,
            project_id=project_id,
        )
        return event.for_group(event.group)


class PerfIssuePlatformEventMixin(PerformanceIssueTestCase):
    def add_event(self, data, project_id, timestamp):
        fingerprint = data["fingerprint"][0]
        fingerprint = (
            fingerprint
            if "-" in fingerprint
            else f"{PerformanceNPlusOneGroupType.type_id}-{data['fingerprint'][0]}"
        )
        event_data = load_data(
            "transaction-n-plus-one",
            timestamp=timestamp.replace(tzinfo=timezone.utc),
            start_timestamp=timestamp.replace(tzinfo=timezone.utc),
            fingerprint=[fingerprint],
        )
        event_data["user"] = {"id": uuid4().hex}
        event_data["environment"] = data.get("environment")
        for tag in event_data["tags"]:
            if tag[0] == "environment":
                tag[1] = data.get("environment")
                break
        else:
            event_data["tags"].append(data.get("environment"))

        # Store a performance event
        event = self.create_performance_issue(
            event_data=event_data,
            project_id=project_id,
            fingerprint=fingerprint,
        )
        return event


class StandardIntervalMixin:
    def test_one_minute_with_events(self):
        data = {"interval": "1m", "value": 6}
        self._run_test(data=data, minutes=1, passes=True, add_events=True)
        data = {"interval": "1m", "value": 16}
        self._run_test(data=data, minutes=1, passes=False)

    def test_one_hour_with_events(self):
        data = {"interval": "1h", "value": 6}
        self._run_test(data=data, minutes=60, passes=True, add_events=True)
        data = {"interval": "1h", "value": 16}
        self._run_test(data=data, minutes=60, passes=False)

    def test_one_day_with_events(self):
        data = {"interval": "1d", "value": 6}
        self._run_test(data=data, minutes=1440, passes=True, add_events=True)
        data = {"interval": "1d", "value": 16}
        self._run_test(data=data, minutes=1440, passes=False)

    def test_one_week_with_events(self):
        data = {"interval": "1w", "value": 6}
        self._run_test(data=data, minutes=10080, passes=True, add_events=True)
        data = {"interval": "1w", "value": 16}
        self._run_test(data=data, minutes=10080, passes=False)

    def test_one_minute_no_events(self):
        data = {"interval": "1m", "value": 6}
        self._run_test(data=data, minutes=1, passes=False)

    def test_one_hour_no_events(self):
        data = {"interval": "1h", "value": 6}
        self._run_test(data=data, minutes=60, passes=False)

    def test_one_day_no_events(self):
        data = {"interval": "1d", "value": 6}
        self._run_test(data=data, minutes=1440, passes=False)

    def test_one_week_no_events(self):
        data = {"interval": "1w", "value": 6}
        self._run_test(data=data, minutes=10080, passes=False)

    def test_comparison(self):
        # Test data is 4 events in the current period and 2 events in the comparison period, so
        # a 100% increase.
        event = self.add_event(
            data={
                "fingerprint": ["something_random"],
                "user": {"id": uuid4().hex},
            },
            project_id=self.project.id,
            timestamp=before_now(minutes=1),
        )
        self.increment(
            event,
            3,
            timestamp=now() - timedelta(minutes=1),
        )
        self.increment(
            event,
            2,
            timestamp=now() - timedelta(days=1, minutes=20),
        )
        data = {
            "interval": "1h",
            "value": 99,
            "comparisonType": "percent",
            "comparisonInterval": "1d",
        }
        rule = self.get_rule(data=data, rule=Rule(environment_id=None))
        self.assertPasses(rule, event)

        data = {
            "interval": "1h",
            "value": 101,
            "comparisonType": "percent",
            "comparisonInterval": "1d",
        }
        rule = self.get_rule(data=data, rule=Rule(environment_id=None))
        self.assertDoesNotPass(rule, event)

    def test_comparison_empty_comparison_period(self):
        # Test data is 1 event in the current period and 0 events in the comparison period. This
        # should always result in 0 and never fire.
        event = self.add_event(
            data={
                "fingerprint": ["something_random"],
                "user": {"id": uuid4().hex},
            },
            project_id=self.project.id,
            timestamp=before_now(minutes=1),
        )
        data = {
            "interval": "1h",
            "value": 0,
            "comparisonType": "percent",
            "comparisonInterval": "1d",
        }
        rule = self.get_rule(data=data, rule=Rule(environment_id=None))
        self.assertDoesNotPass(rule, event)

        data = {
            "interval": "1h",
            "value": 100,
            "comparisonType": "percent",
            "comparisonInterval": "1d",
        }
        rule = self.get_rule(data=data, rule=Rule(environment_id=None))
        self.assertDoesNotPass(rule, event)


class EventFrequencyConditionTestCase(
    FrequencyConditionMixin, StandardIntervalMixin, SnubaTestCase
):
    rule_cls = EventFrequencyCondition

    def increment(self, event, count, environment=None, timestamp=None):
        timestamp = timestamp if timestamp else before_now(minutes=1)
        data = {"fingerprint": event.data["fingerprint"]}
        if environment:
            data["environment"] = environment

        for _ in range(count):
            self.add_event(
                data=data,
                project_id=self.project.id,
                timestamp=timestamp,
            )


class EventUniqueUserFrequencyConditionTestCase(
    FrequencyConditionMixin,
    StandardIntervalMixin,
    SnubaTestCase,
):
    rule_cls = EventUniqueUserFrequencyCondition

    def increment(self, event, count, environment=None, timestamp=None):
        timestamp = timestamp if timestamp else before_now(minutes=1)
        data = {"fingerprint": event.data["fingerprint"]}
        if environment:
            data["environment"] = environment

        for _ in range(count):
            event_data = deepcopy(data)
            event_data["user"] = {"id": uuid4().hex}
            self.add_event(
                data=event_data,
                project_id=self.project.id,
                timestamp=timestamp,
            )


class EventFrequencyPercentConditionTestCase(SnubaTestCase):
    rule_cls = EventFrequencyPercentCondition

    def _make_sessions(self, num):
        received = time.time()

        def make_session(i):
            return dict(
                distinct_id=uuid4().hex,
                session_id=uuid4().hex,
                org_id=self.project.organization_id,
                project_id=self.project.id,
                status="ok",
                seq=0,
                release="foo@1.0.0",
                environment="prod",
                retention_days=90,
                duration=None,
                errors=0,
                # The line below is crucial to spread sessions throughout the time period.
                started=received - i,
                received=received,
            )

        self.bulk_store_sessions([make_session(i) for i in range(num)])

    def _run_test(self, minutes, data, passes, add_events=False):
        if not self.environment or self.environment.name != "prod":
            self.environment = self.create_environment(name="prod")
        if not hasattr(self, "test_event"):
            self.test_event = self.add_event(
                data={
                    "fingerprint": ["something_random"],
                    "user": {"id": uuid4().hex},
                    "environment": self.environment.name,
                },
                project_id=self.project.id,
                timestamp=before_now(minutes=minutes),
            )
        if add_events:
            self.increment(
                self.test_event,
                max(1, int(minutes / 2)) - 1,
                environment=self.environment.name,
                timestamp=now() - timedelta(minutes=minutes),
            )
        rule = self.get_rule(data=data, rule=Rule(environment_id=None))
        environment_rule = self.get_rule(data=data, rule=Rule(environment_id=self.environment.id))
        if passes:
            self.assertPasses(rule, self.test_event)
            self.assertPasses(environment_rule, self.test_event)
        else:
            self.assertDoesNotPass(rule, self.test_event)
            self.assertDoesNotPass(environment_rule, self.test_event)

    def increment(self, event, count, environment=None, timestamp=None):
        data = {
            "fingerprint": event.data["fingerprint"],
        }
        timestamp = timestamp if timestamp else before_now(minutes=1)
        if environment:
            data["environment"] = environment

        for _ in range(count):
            event_data = deepcopy(data)
            event_data["user"] = {"id": uuid4().hex}
            self.add_event(
                data=event_data,
                project_id=self.project.id,
                timestamp=timestamp,
            )

    @patch("sentry.rules.conditions.event_frequency.MIN_SESSIONS_TO_FIRE", 1)
    def test_five_minutes_with_events(self):
        self._make_sessions(60)
        data = {"interval": "5m", "value": 39}
        self._run_test(data=data, minutes=5, passes=True, add_events=True)
        data = {"interval": "5m", "value": 41}
        self._run_test(data=data, minutes=5, passes=False)

    @patch("sentry.rules.conditions.event_frequency.MIN_SESSIONS_TO_FIRE", 1)
    def test_ten_minutes_with_events(self):
        self._make_sessions(60)
        data = {"interval": "10m", "value": 49}
        self._run_test(data=data, minutes=10, passes=True, add_events=True)
        data = {"interval": "10m", "value": 51}
        self._run_test(data=data, minutes=10, passes=False)

    @patch("sentry.rules.conditions.event_frequency.MIN_SESSIONS_TO_FIRE", 1)
    def test_thirty_minutes_with_events(self):
        self._make_sessions(60)
        data = {"interval": "30m", "value": 49}
        self._run_test(data=data, minutes=30, passes=True, add_events=True)
        data = {"interval": "30m", "value": 51}
        self._run_test(data=data, minutes=30, passes=False)

    @patch("sentry.rules.conditions.event_frequency.MIN_SESSIONS_TO_FIRE", 1)
    def test_one_hour_with_events(self):
        self._make_sessions(60)
        data = {"interval": "1h", "value": 49}
        self._run_test(data=data, minutes=60, add_events=True, passes=True)
        data = {"interval": "1h", "value": 51}
        self._run_test(data=data, minutes=60, passes=False)

    @patch("sentry.rules.conditions.event_frequency.MIN_SESSIONS_TO_FIRE", 1)
    def test_five_minutes_no_events(self):
        self._make_sessions(60)
        data = {"interval": "5m", "value": 39}
        self._run_test(data=data, minutes=5, passes=True, add_events=True)

    @patch("sentry.rules.conditions.event_frequency.MIN_SESSIONS_TO_FIRE", 1)
    def test_ten_minutes_no_events(self):
        self._make_sessions(60)
        data = {"interval": "10m", "value": 49}
        self._run_test(data=data, minutes=10, passes=True, add_events=True)

    @patch("sentry.rules.conditions.event_frequency.MIN_SESSIONS_TO_FIRE", 1)
    def test_thirty_minutes_no_events(self):
        self._make_sessions(60)
        data = {"interval": "30m", "value": 49}
        self._run_test(data=data, minutes=30, passes=True, add_events=True)

    @patch("sentry.rules.conditions.event_frequency.MIN_SESSIONS_TO_FIRE", 1)
    def test_one_hour_no_events(self):
        self._make_sessions(60)
        data = {"interval": "1h", "value": 49}
        self._run_test(data=data, minutes=60, passes=False)

    @patch("sentry.rules.conditions.event_frequency.MIN_SESSIONS_TO_FIRE", 1)
    def test_comparison(self):
        self._make_sessions(10)
        # Create sessions for previous period
        self._make_sessions(10)

        # Test data is 2 events in the current period and 1 events in the comparison period.
        # Number of sessions is 20 in each period, so current period is 20% of sessions, prev
        # is 10%. Overall a 100% increase comparitively.
        event = self.add_event(
            data={"fingerprint": ["something_random"]},
            project_id=self.project.id,
            timestamp=before_now(minutes=1),
        )
        self.increment(
            event,
            1,
            timestamp=now() - timedelta(minutes=1),
        )
        self.increment(
            event,
            1,
            timestamp=now() - timedelta(days=1, minutes=20),
        )
        data = {
            "interval": "1h",
            "value": 99,
            "comparisonType": "percent",
            "comparisonInterval": "1d",
        }
        rule = self.get_rule(data=data, rule=Rule(environment_id=None))
        self.assertPasses(rule, event)

        data = {
            "interval": "1h",
            "value": 101,
            "comparisonType": "percent",
            "comparisonInterval": "1d",
        }
        rule = self.get_rule(data=data, rule=Rule(environment_id=None))
        self.assertDoesNotPass(rule, event)


@freeze_time((now() - timedelta(days=2)).replace(hour=12, minute=40, second=0, microsecond=0))
@region_silo_test
class ErrorIssueFrequencyConditionTestCase(
    EventFrequencyConditionTestCase, RuleTestCase, ErrorEventMixin
):
    pass


@freeze_time((now() - timedelta(days=2)).replace(hour=12, minute=40, second=0, microsecond=0))
@region_silo_test
class PerfIssuePlatformIssueFrequencyConditionTestCase(
    PerfIssuePlatformEventMixin,
    EventFrequencyConditionTestCase,
    RuleTestCase,
):
    pass


@freeze_time((now() - timedelta(days=2)).replace(hour=12, minute=40, second=0, microsecond=0))
@region_silo_test
class ErrorIssueUniqueUserFrequencyConditionTestCase(
    EventUniqueUserFrequencyConditionTestCase, RuleTestCase, ErrorEventMixin
):
    pass


@freeze_time((now() - timedelta(days=2)).replace(hour=12, minute=40, second=0, microsecond=0))
@region_silo_test
class PerfIssuePlatformIssueUniqueUserFrequencyConditionTestCase(
    PerfIssuePlatformEventMixin,
    EventUniqueUserFrequencyConditionTestCase,
    RuleTestCase,
):
    pass


@freeze_time((now() - timedelta(days=2)).replace(hour=12, minute=40, second=0, microsecond=0))
@region_silo_test
class ErrorIssueEventFrequencyPercentConditionTestCase(
    EventFrequencyPercentConditionTestCase, RuleTestCase, ErrorEventMixin
):
    pass


@freeze_time((now() - timedelta(days=2)).replace(hour=12, minute=40, second=0, microsecond=0))
@region_silo_test
class PerfIssuePlatformIssueEventFrequencyPercentConditionTestCase(
    PerfIssuePlatformEventMixin,
    EventFrequencyPercentConditionTestCase,
    RuleTestCase,
):
    pass