"""
Pydantic representation of database contents.
"""

from __future__ import annotations

from typing import Any

from passlib.context import CryptContext
from pydantic import BaseModel, Field, validator
from sqlalchemy.exc import IntegrityError, InvalidRequestError
from sqlalchemy.orm import Session

from .. import models
from .device import Device
from .user_capability import UserCapability


class UserBase(BaseModel):
    name: str

    country: str
    state: str
    city: str
    organization: str
    organizational_unit: str

    email: str


class UserCreate(UserBase):
    password: str


class User(UserBase):
    capabilities: list[UserCapability] = []

    devices: list[Device] = Field(
        default=[], repr=False
    )

    class Config:
        orm_mode = True

    @validator("capabilities", pre=True)
    @classmethod
    def unify_capabilities(cls, value: list[Any]) -> list[UserCapability]:
        """
        Import the capabilities from various formats
        """

        return [
            UserCapability.from_value(capability)
            for capability in value
        ]

    @classmethod
    def from_db(
        cls,
        db: Session,
        name: str,
    ) -> User | None:
        """
        Load user from database by name.
        """

        try:
            db_user = models.User(name=name)
            db.refresh(db_user)

            return cls.from_orm(db_user)

        except InvalidRequestError:
            return None

    @classmethod
    def create(
        cls,
        db: Session,
        user: UserCreate,
        crypt_context: CryptContext,
    ) -> User | None:
        """
        Create a new user in the database.
        """

        try:
            db_user = models.User(
                name=user.name,
                password=crypt_context.hash(user.password),
                capabilities=[
                    capability.model
                    for capability in user.capabilities
                ],
            )

            db.add(db_user)
            db.commit()
            db.refresh(db_user)

            return cls.from_orm(db_user)

        except IntegrityError:
            # user already existed
            return None

    def is_admin(self) -> bool:
        return UserCapability.admin in self.capabilities

    def authenticate(
        self,
        db: Session,
        password: str,
        crypt_context: CryptContext,
    ) -> User | None:
        """
        Authenticate with name/password against users in database.
        """

        db_user = models.User(name=self.name)
        db.refresh(db_user)

        if db_user is None:
            # nonexistent user, fake doing password verification
            crypt_context.dummy_verify()
            return False

        if not crypt_context.verify(password, db_user.password):
            # password hash mismatch
            return False

        self.from_orm(db_user)

        return True

    def update(
        self,
        db: Session,
    ) -> None:
        """
        Update this user in the database.
        """

        db_user = models.User(name=self.name)
        db.refresh(db_user)

        for capability in db_user.capabilities:
            db.delete(capability)

        db_user.capabilities = [
            capability.model
            for capability in self.capabilities
        ]

        db.commit()

    def delete(
        self,
        db: Session,
    ) -> bool:
        """
        Delete this user from the database.
        """

        db_user = models.User(name=self.name)
        db.refresh(db_user)

        if db_user is None:
            # nonexistent user
            return False

        db.delete(db_user)
        db.commit()
        return True