from collections.abc import Mapping
from datetime import date
from typing import Optional

from app.dao.child import ChildDAO
from app.service.im import ensure_parent_child_conversation


class ChildService:
    def __init__(self, db):
        self.db = db
        self.dao = ChildDAO(db)

    def create(
        self,
        user_id: int,
        child_name: str,
        child_gender: int = 2,
        child_birthday: Optional[date] = None,
    ) -> Mapping:
        try:
            child_id = self.dao.create(
                user_id,
                child_name,
                child_gender,
                child_birthday,
                auto_commit=False,
            )
            ensure_parent_child_conversation(
                self.db,
                parent_user_id=user_id,
                child_id=child_id,
            )
            self.db.commit()
            return self.dao.get_by_id(child_id)
        except Exception:
            self.db.rollback()
            raise

    def list_children(self, user_id: int, limit: int = 20, cursor: int = None) -> tuple[list, bool]:
        rows = self.dao.list_by_parent(user_id, limit, cursor)
        has_more = len(rows) > limit
        rows = rows[:limit]
        return rows, has_more

    def get(self, child_id: int) -> Optional[Mapping]:
        return self.dao.get_by_id(child_id)

    def update(
        self,
        child_id: int,
        user_id: int,
        child_name: Optional[str] = None,
        child_gender: Optional[int] = None,
        child_birthday: Optional[date] = None,
    ) -> Mapping:
        if not self.dao.has_access(child_id, user_id):
            raise PermissionError("No access to this child")
        self.dao.update(child_id, child_name, child_gender, child_birthday)
        return self.dao.get_by_id(child_id)