from enum import Enum
from sqlalchemy import Index, ForeignKey, Column, Enum as SQLAEnum, Table, String
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import relationship
from sqlalchemy.event import listen

from atst.utils import first_or_none
from atst.models.base import Base
import atst.models.mixins as mixins
import atst.models.types as types
from atst.models.mixins.auditable import record_permission_sets_updates


class Status(Enum):
    ACTIVE = "active"
    DISABLED = "disabled"
    PENDING = "pending"


application_roles_permission_sets = Table(
    "application_roles_permission_sets",
    Base.metadata,
    Column(
        "application_role_id", UUID(as_uuid=True), ForeignKey("application_roles.id")
    ),
    Column("permission_set_id", UUID(as_uuid=True), ForeignKey("permission_sets.id")),
)


class ApplicationRole(
    Base,
    mixins.TimestampsMixin,
    mixins.AuditableMixin,
    mixins.PermissionsMixin,
    mixins.DeletableMixin,
    mixins.ClaimableMixin,
):
    __tablename__ = "application_roles"

    id = types.Id()
    application_id = Column(
        UUID(as_uuid=True), ForeignKey("applications.id"), index=True, nullable=False
    )
    application = relationship("Application", back_populates="roles")

    user_id = Column(
        UUID(as_uuid=True), ForeignKey("users.id"), index=True, nullable=True
    )

    status = Column(
        SQLAEnum(Status, native_enum=False), default=Status.PENDING, nullable=False
    )

    permission_sets = relationship(
        "PermissionSet", secondary=application_roles_permission_sets
    )

    environment_roles = relationship(
        "EnvironmentRole",
        primaryjoin="and_(EnvironmentRole.application_role_id == ApplicationRole.id, EnvironmentRole.deleted == False)",
    )

    cloud_id = Column(String)

    @property
    def latest_invitation(self):
        if self.invitations:
            return self.invitations[-1]

    @property
    def user_name(self):
        if self.user:
            return self.user.full_name
        elif self.latest_invitation:
            return self.latest_invitation.user_name

    def __repr__(self):
        return "<ApplicationRole(application='{}', user_id='{}', id='{}', permissions={})>".format(
            self.application.name, self.user_id, self.id, self.permissions
        )

    @property
    def history(self):
        previous_state = self.get_changes()
        change_set = {}
        if "status" in previous_state:
            from_status = previous_state["status"][0].value
            to_status = self.status.value
            change_set["status"] = [from_status, to_status]
        return change_set

    def has_permission_set(self, perm_set_name):
        return first_or_none(
            lambda prms: prms.name == perm_set_name, self.permission_sets
        )

    @property
    def portfolio_id(self):
        return self.application.portfolio_id

    @property
    def event_details(self):
        return {
            "updated_user_name": self.user_name,
            "updated_user_id": str(self.user_id),
            "application": self.application.name,
            "portfolio": self.application.portfolio.name,
        }

    @property
    def is_pending(self):
        return self.status == Status.PENDING

    @property
    def is_active(self):
        return self.status == Status.ACTIVE

    @property
    def display_status(self):
        if (
            self.is_pending
            and self.latest_invitation
            and self.latest_invitation.is_expired
        ):
            return "invite_expired"
        elif (
            self.is_pending
            and self.latest_invitation
            and self.latest_invitation.is_pending
        ):
            return "invite_pending"
        elif self.is_active and any(
            env_role.is_pending for env_role in self.environment_roles
        ):
            return "changes_pending"

        return None


Index(
    "application_role_user_application",
    ApplicationRole.user_id,
    ApplicationRole.application_id,
    unique=True,
)


listen(
    ApplicationRole.permission_sets,
    "bulk_replace",
    record_permission_sets_updates,
    raw=True,
)