import logging
import typing
import uuid

from django.conf import settings
from django.core.validators import MinLengthValidator
from django.db import models
from django.db.models import Count, JSONField, Q
from django.utils import timezone
from mirage import fields as mirage_fields

from apps.alerts.models import MaintainableObject
from apps.chatops_proxy.utils import (
    register_oncall_tenant_with_async_fallback,
    unlink_slack_team,
    unregister_oncall_tenant,
)
from apps.grafana_plugin.ui_url_builder import UIURLBuilder
from apps.user_management.subscription_strategy import FreePublicBetaSubscriptionStrategy
from apps.user_management.types import AlertGroupTableColumn
from common.constants.plugin_ids import PluginID
from common.insight_log import ChatOpsEvent, ChatOpsTypePlug, write_chatops_insight_log
from common.public_primary_keys import generate_public_primary_key, increase_public_primary_key_length

if typing.TYPE_CHECKING:
    from django.db.models.manager import RelatedManager

    from apps.alerts.models import AlertReceiveChannel
    from apps.auth_token.models import (
        ApiAuthToken,
        PluginAuthToken,
        ScheduleExportAuthToken,
        UserScheduleExportAuthToken,
    )
    from apps.mobile_app.models import MobileAppAuthToken
    from apps.schedules.models import CustomOnCallShift, OnCallSchedule
    from apps.slack.models import SlackChannel, SlackTeamIdentity
    from apps.telegram.models import TelegramToOrganizationConnector
    from apps.user_management.models import Region, Team, User

logger = logging.getLogger(__name__)


def generate_public_primary_key_for_organization():
    prefix = "O"
    new_public_primary_key = generate_public_primary_key(prefix)

    failure_counter = 0
    while Organization.objects.filter(public_primary_key=new_public_primary_key).exists():
        new_public_primary_key = increase_public_primary_key_length(
            failure_counter=failure_counter, prefix=prefix, model_name="Organization"
        )
        failure_counter += 1

    return new_public_primary_key


class ProvisionedPlugin(typing.TypedDict):
    stackId: int
    orgId: int
    onCallToken: str
    license: str


class OrganizationQuerySet(models.QuerySet):
    def create(self, **kwargs):
        instance = super().create(**kwargs)
        if settings.FEATURE_MULTIREGION_ENABLED:
            register_oncall_tenant_with_async_fallback(instance)
        return instance

    def delete(self):
        # Be careful with deleting via queryset - it doesn't delete chatops-proxy connectors.
        self.update(deleted_at=timezone.now())

    def hard_delete(self):
        super().delete()


class OrganizationManager(models.Manager):
    def get_queryset(self):
        return OrganizationQuerySet(self.model, using=self._db).filter(deleted_at__isnull=True)


# TODO: in a subsequent PR, remove the inheritance from MaintainableObject (plus generate the database migration file)
# this will remove the maintenance related columns that're no longer used on the organization object
# class Organization(models.Model):
class Organization(MaintainableObject):
    alert_receive_channels: "RelatedManager['AlertReceiveChannel']"
    auth_tokens: "RelatedManager['ApiAuthToken']"
    custom_on_call_shifts: "RelatedManager['CustomOnCallShift']"
    default_slack_channel: typing.Optional["SlackChannel"]
    migration_destination: typing.Optional["Region"]
    mobile_app_auth_tokens: "RelatedManager['MobileAppAuthToken']"
    oncall_schedules: "RelatedManager['OnCallSchedule']"
    plugin_auth_tokens: "RelatedManager['PluginAuthToken']"
    schedule_export_token: "RelatedManager['ScheduleExportAuthToken']"
    slack_team_identity: typing.Optional["SlackTeamIdentity"]
    teams: "RelatedManager['Team']"
    telegram_channel: "RelatedManager['TelegramToOrganizationConnector']"
    user_schedule_export_token: "RelatedManager['UserScheduleExportAuthToken']"
    users: "RelatedManager['User']"

    objects: models.Manager["Organization"] = OrganizationManager()
    objects_with_deleted = models.Manager()

    public_primary_key = models.CharField(
        max_length=20,
        validators=[MinLengthValidator(settings.PUBLIC_PRIMARY_KEY_MIN_LENGTH + 1)],
        unique=True,
        default=generate_public_primary_key_for_organization,
    )

    stack_id = models.PositiveIntegerField()
    org_id = models.PositiveIntegerField()

    stack_slug = models.CharField(max_length=300)
    org_slug = models.CharField(max_length=300)
    org_title = models.CharField(max_length=300)
    region_slug = models.CharField(max_length=300, null=True, default=None)
    migration_destination = models.ForeignKey(
        to="user_management.Region",
        to_field="slug",
        db_column="migration_destination_slug",
        on_delete=models.SET_NULL,
        related_name="regions",
        default=None,
        null=True,
    )
    cluster_slug = models.CharField(max_length=300, null=True, default=None)

    grafana_url = models.URLField()

    api_token = mirage_fields.EncryptedCharField(max_length=300)

    (
        API_TOKEN_STATUS_PENDING,
        API_TOKEN_STATUS_OK,
        API_TOKEN_STATUS_FAILED,
    ) = range(3)
    API_TOKEN_STATUS_CHOICES = (
        (API_TOKEN_STATUS_PENDING, "API Token Status Pending"),
        (API_TOKEN_STATUS_OK, "API Token Status Ok"),
        (API_TOKEN_STATUS_FAILED, "API Token Status Failed"),
    )
    api_token_status = models.IntegerField(
        choices=API_TOKEN_STATUS_CHOICES,
        default=API_TOKEN_STATUS_PENDING,
    )

    gcom_token = mirage_fields.EncryptedCharField(max_length=300, null=True, default=None)
    gcom_token_org_last_time_synced = models.DateTimeField(null=True, default=None)
    gcom_org_contract_type = models.CharField(max_length=300, null=True, default=None)
    gcom_org_irm_sku_subscription_start_date = models.DateTimeField(null=True, default=None)
    gcom_org_oldest_admin_with_billing_privileges_user_id = models.PositiveIntegerField(null=True)

    last_time_synced = models.DateTimeField(null=True, default=None)

    is_resolution_note_required = models.BooleanField(default=False)

    # TODO: this field is specific to slack and will be moved to a different model
    slack_team_identity = models.ForeignKey(
        "slack.SlackTeamIdentity", on_delete=models.PROTECT, null=True, default=None, related_name="organizations"
    )
    default_slack_channel = models.ForeignKey(
        "slack.SlackChannel",
        null=True,
        default=None,
        on_delete=models.SET_NULL,
        related_name="+",
    )

    # uuid used to unuqie identify organization in different clusters
    uuid = models.UUIDField(default=uuid.uuid4, editable=False)

    deleted_at = models.DateTimeField(null=True)

    # Organization Settings configured from slack
    (
        ACKNOWLEDGE_REMIND_NEVER,
        ACKNOWLEDGE_REMIND_1H,
        ACKNOWLEDGE_REMIND_3H,
        ACKNOWLEDGE_REMIND_5H,
        ACKNOWLEDGE_REMIND_10H,
    ) = range(5)
    ACKNOWLEDGE_REMIND_CHOICES = (
        (ACKNOWLEDGE_REMIND_NEVER, "Never remind"),
        (ACKNOWLEDGE_REMIND_1H, "Remind every 1 hour"),
        (ACKNOWLEDGE_REMIND_3H, "Remind every 3 hours"),
        (ACKNOWLEDGE_REMIND_5H, "Remind every 5 hours"),
        (ACKNOWLEDGE_REMIND_10H, "Remind every 10 hours"),
    )
    ACKNOWLEDGE_REMIND_DELAY = {
        ACKNOWLEDGE_REMIND_NEVER: 0,
        ACKNOWLEDGE_REMIND_1H: 3600,
        ACKNOWLEDGE_REMIND_3H: 10800,
        ACKNOWLEDGE_REMIND_5H: 18000,
        ACKNOWLEDGE_REMIND_10H: 36000,
    }
    acknowledge_remind_timeout = models.IntegerField(
        choices=ACKNOWLEDGE_REMIND_CHOICES,
        default=ACKNOWLEDGE_REMIND_NEVER,
    )

    (
        UNACKNOWLEDGE_TIMEOUT_NEVER,
        UNACKNOWLEDGE_TIMEOUT_5MIN,
        UNACKNOWLEDGE_TIMEOUT_15MIN,
        UNACKNOWLEDGE_TIMEOUT_30MIN,
        UNACKNOWLEDGE_TIMEOUT_45MIN,
    ) = range(5)

    UNACKNOWLEDGE_TIMEOUT_CHOICES = (
        (UNACKNOWLEDGE_TIMEOUT_NEVER, "and never unack"),
        (UNACKNOWLEDGE_TIMEOUT_5MIN, "and unack in 5 min if no response"),
        (UNACKNOWLEDGE_TIMEOUT_15MIN, "and unack in 15 min if no response"),
        (UNACKNOWLEDGE_TIMEOUT_30MIN, "and unack in 30 min if no response"),
        (UNACKNOWLEDGE_TIMEOUT_45MIN, "and unack in 45 min if no response"),
    )
    UNACKNOWLEDGE_TIMEOUT_DELAY = {
        UNACKNOWLEDGE_TIMEOUT_NEVER: 0,
        UNACKNOWLEDGE_TIMEOUT_5MIN: 300,
        UNACKNOWLEDGE_TIMEOUT_15MIN: 900,
        UNACKNOWLEDGE_TIMEOUT_30MIN: 1800,
        UNACKNOWLEDGE_TIMEOUT_45MIN: 2700,
    }
    unacknowledge_timeout = models.IntegerField(
        choices=UNACKNOWLEDGE_TIMEOUT_CHOICES,
        default=UNACKNOWLEDGE_TIMEOUT_NEVER,
    )

    # This field is used to calculate public suggestions time
    # Not sure if it is needed
    datetime = models.DateTimeField(auto_now_add=True)

    FREE_PUBLIC_BETA_PRICING = 0
    PRICING_CHOICES = ((FREE_PUBLIC_BETA_PRICING, "Free public beta"),)
    pricing_version = models.PositiveIntegerField(choices=PRICING_CHOICES, default=FREE_PUBLIC_BETA_PRICING)

    is_rbac_permissions_enabled = models.BooleanField(default=False)
    is_grafana_incident_enabled = models.BooleanField(default=False)
    is_grafana_labels_enabled = models.BooleanField(default=False, null=True)
    is_grafana_irm_enabled = models.BooleanField(default=False, null=True)

    alert_group_table_columns: list[AlertGroupTableColumn] | None = JSONField(default=None, null=True)
    grafana_incident_backend_url = models.CharField(max_length=300, null=True, default=None)

    direct_paging_prefer_important_policy = models.BooleanField(default=False, null=True)

    class Meta:
        unique_together = ("stack_id", "org_id")

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.subscription_strategy = self._get_subscription_strategy()

    def delete(self):
        if settings.FEATURE_MULTIREGION_ENABLED:
            unregister_oncall_tenant(str(self.uuid), settings.ONCALL_BACKEND_REGION)
            if self.slack_team_identity and not settings.UNIFIED_SLACK_APP_ENABLED:
                unlink_slack_team(str(self.uuid), self.slack_team_identity.slack_id)
        self.deleted_at = timezone.now()
        self.save(update_fields=["deleted_at"])

    def hard_delete(self):
        super().delete()

    def _get_subscription_strategy(self):
        if self.pricing_version == self.FREE_PUBLIC_BETA_PRICING:
            return FreePublicBetaSubscriptionStrategy(self)

    def provision_plugin(self) -> ProvisionedPlugin:
        from apps.auth_token.models import PluginAuthToken

        _, token = PluginAuthToken.create_auth_token(organization=self)
        return {
            "stackId": self.stack_id,
            "orgId": self.org_id,
            "onCallToken": token,
            "license": settings.LICENSE,
        }

    def revoke_plugin(self):
        from apps.auth_token.models import PluginAuthToken

        PluginAuthToken.objects.filter(organization=self).delete()

    """
    Following methods:
    phone_calls_left, sms_left, emails_left
    serve for calculating notifications' limits and composed from self.subscription_strategy.
    """

    def phone_calls_left(self, user):
        return self.subscription_strategy.phone_calls_left(user)

    def sms_left(self, user):
        return self.subscription_strategy.sms_left(user)

    # todo: manage backend specific limits in messaging backend
    def emails_left(self, user):
        return self.subscription_strategy.emails_left(user)

    def update_alert_group_table_columns(self, columns: typing.List[AlertGroupTableColumn]) -> None:
        if columns != self.alert_group_table_columns:
            self.alert_group_table_columns = columns
            self.save(update_fields=["alert_group_table_columns"])

    def set_default_slack_channel(self, slack_channel: "SlackChannel", user: "User") -> None:
        if self.default_slack_channel != slack_channel:
            old_default_slack_channel = self.default_slack_channel
            old_channel_name = old_default_slack_channel.name if old_default_slack_channel else None

            self.default_slack_channel = slack_channel
            self.save(update_fields=["default_slack_channel"])

            write_chatops_insight_log(
                author=user,
                event_name=ChatOpsEvent.DEFAULT_CHANNEL_CHANGED,
                chatops_type=ChatOpsTypePlug.SLACK.value,
                prev_channel=old_channel_name,
                new_channel=slack_channel.name,
            )

    def get_notifiable_direct_paging_integrations(self) -> "RelatedManager['AlertReceiveChannel']":
        """
        in layman's terms, this filters down an organization's integrations to ones which meet the following criterias:
           - the integration is a direct paging integration

           AND at-least one of the following conditions are true for the integration:
           - have more than one channel filter associated with it
           - OR the organization has either Slack or Telegram configured (as the direct paging integration
           would automatically be configured to be notified via these channel(s))
           - OR the default channel filter associated with the integration has an escalation chain associated with it
           - OR the default channel filter associated with the integration is contactable via a custom
           messaging backend
        """
        from apps.alerts.models import AlertReceiveChannel

        return (
            self.alert_receive_channels.annotate(
                num_channel_filters=Count("channel_filters"),
                # used to determine if the organization has telegram configured
                num_org_telegram_channels=Count("organization__telegram_channel"),
            )
            .filter(
                Q(num_channel_filters__gt=1)
                | (Q(organization__slack_team_identity__isnull=False) | Q(num_org_telegram_channels__gt=0))
                | Q(channel_filters__is_default=True, channel_filters__escalation_chain__isnull=False)
                | Q(channel_filters__is_default=True, channel_filters__notification_backends__isnull=False),
                integration=AlertReceiveChannel.INTEGRATION_DIRECT_PAGING,
            )
            .distinct()
        )

    @property
    def default_slack_channel_slack_id(self) -> typing.Optional[str]:
        return self.default_slack_channel.slack_id if self.default_slack_channel else None

    @property
    def web_link_with_uuid(self):
        """
        It's a workaround to pass some unique identifier to the oncall gateway while proxying telegram requests
        """
        return UIURLBuilder(self).home(f"?oncall-uuid={self.uuid}")

    @property
    def active_ui_plugin_id(self) -> str:
        """
        If `is_grafana_irm_enabled` is True, this will be IRM, otherwise OnCall
        """
        return PluginID.IRM if self.is_grafana_irm_enabled else PluginID.ONCALL

    @classmethod
    def __str__(self):
        return f"{self.pk}: {self.org_title}"

    # Insight logs
    @property
    def insight_logs_type_verbal(self):
        return "organization"

    @property
    def insight_logs_verbal(self):
        return self.org_title

    @property
    def insight_logs_serialized(self):
        return {
            "name": self.org_title,
            "is_resolution_note_required": self.is_resolution_note_required,
        }

    @property
    def insight_logs_metadata(self):
        return {}

    @property
    def is_moved(self):
        return self.migration_destination_id is not None