# Generated by Django 3.2.7 on 2021-10-16 12:41

from django.db import migrations, transaction
from django.db.backends.postgresql.schema import BaseDatabaseSchemaEditor
from django.db.migrations.state import StateApps
from django.utils.timezone import now as timezone_now


def create_role_based_system_groups(
    apps: StateApps, schema_editor: BaseDatabaseSchemaEditor
) -> None:
    Realm = apps.get_model("zerver", "Realm")
    UserProfile = apps.get_model("zerver", "UserProfile")
    UserGroup = apps.get_model("zerver", "UserGroup")
    GroupGroupMembership = apps.get_model("zerver", "GroupGroupMembership")
    UserGroupMembership = apps.get_model("zerver", "UserGroupMembership")

    UserProfile.ROLE_REALM_OWNER = 100
    UserProfile.ROLE_REALM_ADMINISTRATOR = 200
    UserProfile.ROLE_MODERATOR = 300
    UserProfile.ROLE_MEMBER = 400
    UserProfile.ROLE_GUEST = 600

    realms = Realm.objects.all()

    SYSTEM_USER_GROUP_ROLE_MAP = {
        UserProfile.ROLE_REALM_OWNER: {
            "name": "@role:owners",
            "description": "Owners of this organization",
        },
        UserProfile.ROLE_REALM_ADMINISTRATOR: {
            "name": "@role:administrators",
            "description": "Administrators of this organization, including owners",
        },
        UserProfile.ROLE_MODERATOR: {
            "name": "@role:moderators",
            "description": "Moderators of this organization, including administrators",
        },
        UserProfile.ROLE_MEMBER: {
            "name": "@role:members",
            "description": "Members of this organization, not including guests",
        },
        UserProfile.ROLE_GUEST: {
            "name": "@role:everyone",
            "description": "Everyone in this organization, including guests",
        },
    }

    for realm in realms:
        with transaction.atomic():
            if UserGroup.objects.filter(
                realm=realm, name="@role:internet", is_system_group=True
            ).exists():
                # Handle the case where we are rerunning after a
                # failure, and had already processed this realm.
                continue

            role_system_groups_dict = {}
            for role in SYSTEM_USER_GROUP_ROLE_MAP:
                user_group_params = SYSTEM_USER_GROUP_ROLE_MAP[role]
                user_group = UserGroup(
                    name=user_group_params["name"],
                    description=user_group_params["description"],
                    realm=realm,
                    is_system_group=True,
                )
                role_system_groups_dict[role] = user_group

            full_members_system_group = UserGroup(
                name="@role:fullmembers",
                description="Members of this organization, not including new accounts and guests",
                realm=realm,
                is_system_group=True,
            )
            everyone_on_internet_system_group = UserGroup(
                name="@role:internet",
                description="Everyone on the Internet",
                realm=realm,
                is_system_group=True,
            )

            system_user_groups_list = [
                role_system_groups_dict[UserProfile.ROLE_REALM_OWNER],
                role_system_groups_dict[UserProfile.ROLE_REALM_ADMINISTRATOR],
                role_system_groups_dict[UserProfile.ROLE_MODERATOR],
                full_members_system_group,
                role_system_groups_dict[UserProfile.ROLE_MEMBER],
                role_system_groups_dict[UserProfile.ROLE_GUEST],
                everyone_on_internet_system_group,
            ]

            UserGroup.objects.bulk_create(system_user_groups_list)

            subgroup_objects = []
            subgroup, remaining_groups = system_user_groups_list[0], system_user_groups_list[1:]
            for supergroup in remaining_groups:
                subgroup_objects.append(
                    GroupGroupMembership(subgroup=subgroup, supergroup=supergroup)
                )
                subgroup = supergroup

            GroupGroupMembership.objects.bulk_create(subgroup_objects)

            users = UserProfile.objects.filter(realm=realm).only("id", "role", "date_joined")
            group_membership_objects = []
            for user in users:
                system_group = role_system_groups_dict[user.role]
                group_membership_objects.append(
                    UserGroupMembership(user_profile=user, user_group=system_group)
                )

                if (
                    user.role == UserProfile.ROLE_MEMBER
                    and (timezone_now() - user.date_joined).days >= realm.waiting_period_threshold
                ):
                    group_membership_objects.append(
                        UserGroupMembership(user_profile=user, user_group=full_members_system_group)
                    )

            UserGroupMembership.objects.bulk_create(group_membership_objects)


def delete_role_based_system_groups(
    apps: StateApps, schema_editor: BaseDatabaseSchemaEditor
) -> None:
    UserGroup = apps.get_model("zerver", "UserGroup")
    GroupGroupMembership = apps.get_model("zerver", "GroupGroupMembership")
    UserGroupMembership = apps.get_model("zerver", "UserGroupMembership")
    with transaction.atomic():
        GroupGroupMembership.objects.all().delete()
        UserGroupMembership.objects.filter(user_group__is_system_group=True).delete()
        UserGroup.objects.filter(is_system_group=True).delete()


class Migration(migrations.Migration):
    atomic = False

    dependencies = [
        ("zerver", "0381_alter_userprofile_uuid"),
    ]

    operations = [
        migrations.RunPython(
            create_role_based_system_groups,
            reverse_code=delete_role_based_system_groups,
            elidable=True,
        ),
    ]