from sqlalchemy import update, select, insert, and_, func, text, delete

from app.dao.base import BaseDAO
from app.database import async_session_maker, engine  # noqa
from app.models.chat import Chats
from app.models.user_avatar import UserAvatar
from app.models.users import Users
from app.models.user_verification_code import UserVerificationCode
from app.models.user_chat import UserChat
from app.users.schemas import SUser, SUserAvatars


class UserDAO(BaseDAO):
	model = Users

	async def find_one_or_none(self, **filter_by) -> SUser | None:
		async with async_session_maker() as session:
			query = select(Users).filter_by(**filter_by)
			result = await session.execute(query)
			result = result.scalar_one_or_none()
			if result:
				return SUser.model_validate(result, from_attributes=True)

	async def find_all(self, **filter_by):
		async with async_session_maker() as session:
			query = select(Users.__table__.columns).filter_by(**filter_by).where(Users.role != 100)
			result = await session.execute(query)
			return result.mappings().all()

	async def change_data(self, user_id: int, **data_to_change) -> str:
		query = update(Users).where(Users.id == user_id).values(**data_to_change)
		async with async_session_maker() as session:
			await session.execute(query)
			await session.commit()
			query = select(Users.username).where(Users.id == user_id)
			result = await session.execute(query)
			return result.scalar()

	async def get_user_role(self, user_id: int) -> int:
		query = select(Users.role).where(Users.id == user_id)
		async with async_session_maker() as session:
			result = await session.execute(query)
		return result.scalar()

	async def get_user_allowed_chats(self, user_id: int):
		"""
		WITH chats_with_descriptions AS (
			SELECT *
			FROM usersxchats
			LEFT JOIN chats ON usersxchats.chat_id = chats.id
		),

		chats_with_avatars as (
			SELECT *
			FROM chats_with_descriptions
			LEFT JOIN users ON chats_with_descriptions.user_id = users.id
		)

		SELECT chat_id, chat_for, chat_name, avatar_image
		FROM chats_with_avatars
		WHERE user_id = 1
		"""
		chats_with_descriptions = (
			select(UserChat.__table__.columns, Chats.__table__.columns)
			.select_from(UserChat)
			.join(Chats, UserChat.chat_id == Chats.id)
		).cte("chats_with_descriptions")

		chats_with_avatars = (
			select(
				chats_with_descriptions.c.chat_id,
				chats_with_descriptions.c.chat_for,
				chats_with_descriptions.c.chat_name,
				chats_with_descriptions.c.visibility,
				Users.id,
				Users.avatar_image,
				Users.avatar_hex,
			)
			.select_from(chats_with_descriptions)
			.join(Users, Users.id == chats_with_descriptions.c.user_id)
			.cte("chats_with_avatars")
		)
		query = (
			select(
				chats_with_avatars.c.chat_id,
				chats_with_avatars.c.chat_for,
				chats_with_avatars.c.chat_name,
				chats_with_avatars.c.avatar_image,
				chats_with_avatars.c.avatar_hex,
			)
			.select_from(chats_with_avatars)
			.where(and_(chats_with_avatars.c.id == user_id, chats_with_avatars.c.visibility == True))  # noqa: E712
		)

		async with async_session_maker() as session:
			result = await session.execute(query)
			result = result.mappings().all()
		return result

	async def get_user_avatar(self, user_id: int) -> str:
		query = select(Users.avatar_image).where(Users.id == user_id)
		async with async_session_maker() as session:
			result = await session.execute(query)
		return result.scalar()

	async def add_user_avatar(self, user_id: int, avatar: str) -> bool:
		query = insert(UserAvatar).values(user_id=user_id, avatar_image=avatar)
		async with async_session_maker() as session:
			await session.execute(query)
			await session.commit()
			return True

	async def get_user_avatars(self, user_id: int) -> SUserAvatars:
		query = select(
			func.json_build_object(
				"user_avatars", select(
					func.json_agg(
						func.json_build_object(
							"avatar_url", UserAvatar.avatar_image
						)
					)
				)
				.where(UserAvatar.user_id == user_id)
				.scalar_subquery()
			)
		)
		async with async_session_maker() as session:
			result = await session.execute(query)
			result = result.scalar()
			return SUserAvatars.model_validate(result)

	async def delete_user_avatar(self, avatar_id: int, user_id: int) -> bool:
		query = delete(UserAvatar).where(and_(UserAvatar.id == avatar_id, UserAvatar.user_id == user_id))
		async with async_session_maker() as session:
			await session.execute(query)
			await session.commit()
			return True


class UserCodesDAO(BaseDAO):
	model = UserVerificationCode

	async def set_user_codes(self, cls, user_id: int, code: str, description: str):
		query = (
			insert(UserVerificationCode)
			.values(user_id=user_id, code=code, description=description)
			.returning(cls.model.code)
		)
		async with async_session_maker() as session:
			result = await session.execute(query)
			await session.commit()
			return result.scalar()

	async def get_user_codes(self, **filter_by) -> list[dict | None]:
		"""
		SELECT
			usersverificationcodes.id,
			usersverificationcodes.user_id,
			usersverificationcodes.code,
			usersverificationcodes.description,
			usersverificationcodes.date_of_creation
		FROM usersverificationcodes
		WHERE
			usersverificationcodes.user_id = 20
			AND now() - usersverificationcodes.date_of_creation < INTERVAL '30 minutes'
		"""
		query = (
			select(UserVerificationCode.__table__.columns)
			.where((func.now() - UserVerificationCode.date_of_creation) < text("INTERVAL '10 minutes'"))
			.filter_by(**filter_by)
		)

		async with async_session_maker() as session:
			#  print(query.compile(engine, compile_kwargs={"literal_binds": True}))  # Проверка SQL запроса
			result = await session.execute(query)
			result = result.mappings().all()
			return result