from typing import List, Any

from sqlalchemy import and_
from sqlalchemy.orm import aliased
from orm.author import Author
from orm.notification import Notification as NotificationMessage, NotificationSeen
from services.auth import login_required
from services.db import local_session
from strawberry_sqlalchemy_mapper import StrawberrySQLAlchemyMapper
import strawberry

strawberry_sqlalchemy_mapper = StrawberrySQLAlchemyMapper()


@strawberry_sqlalchemy_mapper.type(NotificationMessage)
class Notification:
    id: int
    action: str  # create update delete join follow etc.
    entity: str  # REACTION SHOUT
    created_at: int
    payload: str  # JSON data
    seen: List[int]


@strawberry.type
class NotificationSeenResult:
    error: str = strawberry.field(default=None, name="error")


@strawberry.type
class NotificationsResult:
    notifications: List[Notification]
    unread: int
    total: int


@strawberry.type
class Query:
    @strawberry.field
    @login_required
    async def load_notifications(self, info, limit: int = 50, offset: int = 0) -> NotificationsResult:
        user_id = info.context["user_id"]
        with local_session() as session:
            author = session.query(Author).filter(Author.user == user_id).first()
            NotificationSeenAlias = aliased(NotificationSeen)

            if author:
                nnn = session.query(
                        NotificationMessage,
                        NotificationSeenAlias.viewer.label("seen")
                    ).outerjoin(
                        NotificationSeen,
                        and_(NotificationSeen.viewer == author.id, NotificationSeen.notification == NotificationMessage.id),
                    ).limit(limit).offset(offset).all()
                notifications = []
                for n in nnn:
                    ntf = Notification()
                    ntf.id = n.id
                    ntf.payload = n.payload
                    ntf.entity = n.entity
                    ntf.action = n.action
                    ntf.created_at = n.created_at
                    ntf.seen = n.seen
                    notifications.append(ntf)
                nr = NotificationsResult(
                    notifications = notifications,
                    unread = sum(1 for n in notifications if author.id in n.seen),
                    total = session.query(NotificationMessage).count()
                )
                return nr
        return NotificationsResult(
            notifications=[],
            total = 0,
            unread = 0
        )


@strawberry.type
class Mutation:
    @strawberry.mutation
    @login_required
    async def mark_notification_as_read(self, info, notification_id: int) -> NotificationSeenResult:
        user_id = info.context["user_id"]
        with local_session() as session:
            try:
                author = session.query(Author).filter(Author.user == user_id).first()
                ns = NotificationSeen({"notification": notification_id, "viewer": author.id})
                session.add(ns)
                session.commit()
            except Exception as e:
                session.rollback()
                print(f"[mark_notification_as_read] error: {str(e)}")
                nsr = NotificationSeenResult(error = "cant mark as read")
                return nsr
        return NotificationSeenResult()

    @strawberry.mutation
    @login_required
    async def mark_all_notifications_as_read(self, info) -> NotificationSeenResult:
        user_id = info.context["user_id"]

        with local_session() as session:
            try:
                author = session.query(Author).filter(Author.user == user_id).first()
                if author:
                    _nslist = session.query(NotificationSeen).filter(NotificationSeen.viewer == author.id).all()
            except Exception as e:
                session.rollback()
                print(f"[mark_all_notifications_as_read] error: {str(e)}")
                nsr = NotificationSeenResult()
                nsr.error = "cant mark as read"
                return nsr
        return NotificationSeenResult()


schema = strawberry.Schema(query=Query, mutation=Mutation)