from datetime import timedelta
from typing import Any, Dict, List, Mapping, Type, Union
from unittest import mock

from django.core.management.base import BaseCommand
from django.utils.timezone import now as timezone_now

from analytics.lib.counts import COUNT_STATS, CountStat, do_drop_all_analytics_tables
from analytics.lib.fixtures import generate_time_series_data
from analytics.lib.time_utils import time_range
from analytics.models import (
    BaseCount,
    FillState,
    InstallationCount,
    RealmCount,
    StreamCount,
    UserCount,
)
from zerver.actions.create_realm import do_create_realm
from zerver.actions.users import do_change_user_role
from zerver.lib.create_user import create_user
from zerver.lib.stream_color import STREAM_ASSIGNMENT_COLORS
from zerver.lib.timestamp import floor_to_day
from zerver.models import Client, Realm, Recipient, Stream, Subscription, UserProfile


class Command(BaseCommand):
    help = """Populates analytics tables with randomly generated data."""

    DAYS_OF_DATA = 100
    random_seed = 26

    def generate_fixture_data(
        self,
        stat: CountStat,
        business_hours_base: float,
        non_business_hours_base: float,
        growth: float,
        autocorrelation: float,
        spikiness: float,
        holiday_rate: float = 0,
        partial_sum: bool = False,
    ) -> List[int]:
        self.random_seed += 1
        return generate_time_series_data(
            days=self.DAYS_OF_DATA,
            business_hours_base=business_hours_base,
            non_business_hours_base=non_business_hours_base,
            growth=growth,
            autocorrelation=autocorrelation,
            spikiness=spikiness,
            holiday_rate=holiday_rate,
            frequency=stat.frequency,
            partial_sum=partial_sum,
            random_seed=self.random_seed,
        )

    def handle(self, *args: Any, **options: Any) -> None:
        # TODO: This should arguably only delete the objects
        # associated with the "analytics" realm.
        do_drop_all_analytics_tables()

        # This also deletes any objects with this realm as a foreign key
        Realm.objects.filter(string_id="analytics").delete()

        # Because we just deleted a bunch of objects in the database
        # directly (rather than deleting individual objects in Django,
        # in which case our post_save hooks would have flushed the
        # individual objects from memcached for us), we need to flush
        # memcached in order to ensure deleted objects aren't still
        # present in the memcached cache.
        from zerver.apps import flush_cache

        flush_cache(None)

        installation_time = timezone_now() - timedelta(days=self.DAYS_OF_DATA)
        last_end_time = floor_to_day(timezone_now())
        realm = do_create_realm(
            string_id="analytics", name="Analytics", date_created=installation_time
        )

        with mock.patch("zerver.lib.create_user.timezone_now", return_value=installation_time):
            shylock = create_user(
                "shylock@analytics.ds",
                "Shylock",
                realm,
                full_name="Shylock",
                role=UserProfile.ROLE_REALM_OWNER,
            )
        do_change_user_role(shylock, UserProfile.ROLE_REALM_OWNER, acting_user=None)
        stream = Stream.objects.create(name="all", realm=realm, date_created=installation_time)
        recipient = Recipient.objects.create(type_id=stream.id, type=Recipient.STREAM)
        stream.recipient = recipient
        stream.save(update_fields=["recipient"])

        # Subscribe shylock to the stream to avoid invariant failures.
        # TODO: This should use subscribe_users_to_streams from populate_db.
        subs = [
            Subscription(
                recipient=recipient,
                user_profile=shylock,
                is_user_active=shylock.is_active,
                color=STREAM_ASSIGNMENT_COLORS[0],
            ),
        ]
        Subscription.objects.bulk_create(subs)

        FixtureData = Mapping[Union[str, int, None], List[int]]

        def insert_fixture_data(
            stat: CountStat,
            fixture_data: FixtureData,
            table: Type[BaseCount],
        ) -> None:
            end_times = time_range(
                last_end_time, last_end_time, stat.frequency, len(list(fixture_data.values())[0])
            )
            if table == InstallationCount:
                id_args: Dict[str, Any] = {}
            if table == RealmCount:
                id_args = {"realm": realm}
            if table == UserCount:
                id_args = {"realm": realm, "user": shylock}
            if table == StreamCount:
                id_args = {"stream": stream, "realm": realm}

            for subgroup, values in fixture_data.items():
                table.objects.bulk_create(
                    table(
                        property=stat.property,
                        subgroup=subgroup,
                        end_time=end_time,
                        value=value,
                        **id_args,
                    )
                    for end_time, value in zip(end_times, values)
                    if value != 0
                )

        stat = COUNT_STATS["1day_actives::day"]
        realm_data: FixtureData = {
            None: self.generate_fixture_data(stat, 0.08, 0.02, 3, 0.3, 6, partial_sum=True),
        }
        insert_fixture_data(stat, realm_data, RealmCount)
        installation_data: FixtureData = {
            None: self.generate_fixture_data(stat, 0.8, 0.2, 4, 0.3, 6, partial_sum=True),
        }
        insert_fixture_data(stat, installation_data, InstallationCount)
        FillState.objects.create(
            property=stat.property, end_time=last_end_time, state=FillState.DONE
        )

        stat = COUNT_STATS["7day_actives::day"]
        realm_data = {
            None: self.generate_fixture_data(stat, 0.2, 0.07, 3, 0.3, 6, partial_sum=True),
        }
        insert_fixture_data(stat, realm_data, RealmCount)
        installation_data = {
            None: self.generate_fixture_data(stat, 2, 0.7, 4, 0.3, 6, partial_sum=True),
        }
        insert_fixture_data(stat, installation_data, InstallationCount)
        FillState.objects.create(
            property=stat.property, end_time=last_end_time, state=FillState.DONE
        )

        stat = COUNT_STATS["realm_active_humans::day"]
        realm_data = {
            None: self.generate_fixture_data(stat, 0.8, 0.08, 3, 0.5, 3, partial_sum=True),
        }
        insert_fixture_data(stat, realm_data, RealmCount)
        installation_data = {
            None: self.generate_fixture_data(stat, 1, 0.3, 4, 0.5, 3, partial_sum=True),
        }
        insert_fixture_data(stat, installation_data, InstallationCount)
        FillState.objects.create(
            property=stat.property, end_time=last_end_time, state=FillState.DONE
        )

        stat = COUNT_STATS["active_users_audit:is_bot:day"]
        realm_data = {
            "false": self.generate_fixture_data(stat, 1, 0.2, 3.5, 0.8, 2, partial_sum=True),
            "true": self.generate_fixture_data(stat, 0.3, 0.05, 3, 0.3, 2, partial_sum=True),
        }
        insert_fixture_data(stat, realm_data, RealmCount)
        installation_data = {
            "false": self.generate_fixture_data(stat, 3, 1, 4, 0.8, 2, partial_sum=True),
            "true": self.generate_fixture_data(stat, 1, 0.4, 4, 0.8, 2, partial_sum=True),
        }
        insert_fixture_data(stat, installation_data, InstallationCount)
        FillState.objects.create(
            property=stat.property, end_time=last_end_time, state=FillState.DONE
        )

        stat = COUNT_STATS["messages_sent:is_bot:hour"]
        user_data: FixtureData = {
            "false": self.generate_fixture_data(stat, 2, 1, 1.5, 0.6, 8, holiday_rate=0.1),
        }
        insert_fixture_data(stat, user_data, UserCount)
        realm_data = {
            "false": self.generate_fixture_data(stat, 35, 15, 6, 0.6, 4),
            "true": self.generate_fixture_data(stat, 15, 15, 3, 0.4, 2),
        }
        insert_fixture_data(stat, realm_data, RealmCount)
        installation_data = {
            "false": self.generate_fixture_data(stat, 350, 150, 6, 0.6, 4),
            "true": self.generate_fixture_data(stat, 150, 150, 3, 0.4, 2),
        }
        insert_fixture_data(stat, installation_data, InstallationCount)
        FillState.objects.create(
            property=stat.property, end_time=last_end_time, state=FillState.DONE
        )

        stat = COUNT_STATS["messages_sent:message_type:day"]
        user_data = {
            "public_stream": self.generate_fixture_data(stat, 1.5, 1, 3, 0.6, 8),
            "private_message": self.generate_fixture_data(stat, 0.5, 0.3, 1, 0.6, 8),
            "huddle_message": self.generate_fixture_data(stat, 0.2, 0.2, 2, 0.6, 8),
        }
        insert_fixture_data(stat, user_data, UserCount)
        realm_data = {
            "public_stream": self.generate_fixture_data(stat, 30, 8, 5, 0.6, 4),
            "private_stream": self.generate_fixture_data(stat, 7, 7, 5, 0.6, 4),
            "private_message": self.generate_fixture_data(stat, 13, 5, 5, 0.6, 4),
            "huddle_message": self.generate_fixture_data(stat, 6, 3, 3, 0.6, 4),
        }
        insert_fixture_data(stat, realm_data, RealmCount)
        installation_data = {
            "public_stream": self.generate_fixture_data(stat, 300, 80, 5, 0.6, 4),
            "private_stream": self.generate_fixture_data(stat, 70, 70, 5, 0.6, 4),
            "private_message": self.generate_fixture_data(stat, 130, 50, 5, 0.6, 4),
            "huddle_message": self.generate_fixture_data(stat, 60, 30, 3, 0.6, 4),
        }
        insert_fixture_data(stat, installation_data, InstallationCount)
        FillState.objects.create(
            property=stat.property, end_time=last_end_time, state=FillState.DONE
        )

        website, created = Client.objects.get_or_create(name="website")
        old_desktop, created = Client.objects.get_or_create(name="desktop app Linux 0.3.7")
        android, created = Client.objects.get_or_create(name="ZulipAndroid")
        iOS, created = Client.objects.get_or_create(name="ZulipiOS")
        react_native, created = Client.objects.get_or_create(name="ZulipMobile")
        API, created = Client.objects.get_or_create(name="API: Python")
        zephyr_mirror, created = Client.objects.get_or_create(name="zephyr_mirror")
        unused, created = Client.objects.get_or_create(name="unused")
        long_webhook, created = Client.objects.get_or_create(name="ZulipLooooooooooongNameWebhook")

        stat = COUNT_STATS["messages_sent:client:day"]
        user_data = {
            website.id: self.generate_fixture_data(stat, 2, 1, 1.5, 0.6, 8),
            zephyr_mirror.id: self.generate_fixture_data(stat, 0, 0.3, 1.5, 0.6, 8),
        }
        insert_fixture_data(stat, user_data, UserCount)
        realm_data = {
            website.id: self.generate_fixture_data(stat, 30, 20, 5, 0.6, 3),
            old_desktop.id: self.generate_fixture_data(stat, 5, 3, 8, 0.6, 3),
            android.id: self.generate_fixture_data(stat, 5, 5, 2, 0.6, 3),
            iOS.id: self.generate_fixture_data(stat, 5, 5, 2, 0.6, 3),
            react_native.id: self.generate_fixture_data(stat, 5, 5, 10, 0.6, 3),
            API.id: self.generate_fixture_data(stat, 5, 5, 5, 0.6, 3),
            zephyr_mirror.id: self.generate_fixture_data(stat, 1, 1, 3, 0.6, 3),
            unused.id: self.generate_fixture_data(stat, 0, 0, 0, 0, 0),
            long_webhook.id: self.generate_fixture_data(stat, 5, 5, 2, 0.6, 3),
        }
        insert_fixture_data(stat, realm_data, RealmCount)
        installation_data = {
            website.id: self.generate_fixture_data(stat, 300, 200, 5, 0.6, 3),
            old_desktop.id: self.generate_fixture_data(stat, 50, 30, 8, 0.6, 3),
            android.id: self.generate_fixture_data(stat, 50, 50, 2, 0.6, 3),
            iOS.id: self.generate_fixture_data(stat, 50, 50, 2, 0.6, 3),
            react_native.id: self.generate_fixture_data(stat, 5, 5, 10, 0.6, 3),
            API.id: self.generate_fixture_data(stat, 50, 50, 5, 0.6, 3),
            zephyr_mirror.id: self.generate_fixture_data(stat, 10, 10, 3, 0.6, 3),
            unused.id: self.generate_fixture_data(stat, 0, 0, 0, 0, 0),
            long_webhook.id: self.generate_fixture_data(stat, 50, 50, 2, 0.6, 3),
        }
        insert_fixture_data(stat, installation_data, InstallationCount)
        FillState.objects.create(
            property=stat.property, end_time=last_end_time, state=FillState.DONE
        )

        stat = COUNT_STATS["messages_in_stream:is_bot:day"]
        realm_data = {
            "false": self.generate_fixture_data(stat, 30, 5, 6, 0.6, 4),
            "true": self.generate_fixture_data(stat, 20, 2, 3, 0.2, 3),
        }
        insert_fixture_data(stat, realm_data, RealmCount)
        stream_data: Mapping[Union[int, str, None], List[int]] = {
            "false": self.generate_fixture_data(stat, 10, 7, 5, 0.6, 4),
            "true": self.generate_fixture_data(stat, 5, 3, 2, 0.4, 2),
        }
        insert_fixture_data(stat, stream_data, StreamCount)
        FillState.objects.create(
            property=stat.property, end_time=last_end_time, state=FillState.DONE
        )

        stat = COUNT_STATS["messages_read::hour"]
        user_data = {
            None: self.generate_fixture_data(stat, 7, 3, 2, 0.6, 8, holiday_rate=0.1),
        }
        insert_fixture_data(stat, user_data, UserCount)
        realm_data = {None: self.generate_fixture_data(stat, 50, 35, 6, 0.6, 4)}
        insert_fixture_data(stat, realm_data, RealmCount)
        FillState.objects.create(
            property=stat.property, end_time=last_end_time, state=FillState.DONE
        )
