from __future__ import annotations

from dataclasses import dataclass
from typing import TYPE_CHECKING, Optional, cast, TypeVar, Type, Generic

from litestar import Controller, delete, get, post, put
from litestar.contrib.repository.filters import LimitOffset, SearchFilter, FilterTypes
from litestar.di import Provide
from litestar.pagination import (
    AbstractAsyncOffsetPaginator,
    AbstractSyncClassicPaginator,
)
from litestar.status_codes import HTTP_200_OK
from sqlalchemy import ScalarResult, func, select
from sqlalchemy.ext.asyncio import AsyncSession

from app.domain.machine import (
    Machine,
    MachineReadDTO,
    MachineWriteDTO,
    Repository,
    Service,
)
from app.lib.responses import ObjectListResponse, ObjectResponse

if TYPE_CHECKING:
    from sqlalchemy.ext.asyncio import AsyncSession


DETAIL_ROUTE = "/{machine_id:int}"


def provides_service(db_session: AsyncSession) -> Service:
    """Constructs repository and service objects for the request."""
    return Service(Repository(session=db_session))


# class MachineOffsetPaginator(AbstractAsyncOffsetPaginator[Machine]):
#     def __init__(
#         self, async_session: AsyncSession
#     ) -> None:  # 'async_session' dependency will be injected here.
#         self.async_session = async_session
#
#     async def get_total(self) -> int:
#         return cast(
#             "int", await self.async_session.scalar(select(func.count(Machine.id)))
#         )
#
#     async def get_items(self, limit: int, offset: int) -> list[Machine]:
#         people: ScalarResult = await self.async_session.scalars(
#             select(Machine).slice(offset, limit)
#         )
#         return list(people.all())


class MachineController(Controller):
    dto = MachineWriteDTO
    return_dto = MachineReadDTO
    path = "/machines"
    dependencies = {
        "service": Provide(provides_service, sync_to_thread=False),
    }
    tags = ["Machines"]

    @get()
    async def get_machines(
        self, service: Service, search: Optional[str] = None
    ) -> ObjectListResponse[Machine]:
        filters = [
            LimitOffset(limit=20, offset=0),
        ]

        if search is not None:
            filters.append(
                SearchFilter(
                    field_name="caption",
                    value=search,
                ),
            )

        content = await service.list(*filters)
        return ObjectListResponse(content=content)

    # @post()
    # async def create_author(self, data: Machine, service: Service) -> Machine:
    #     return await service.create(data)
    #
    @get(DETAIL_ROUTE)
    async def get_machine(self, service: Service, machine_id: int) -> ObjectResponse[Machine]:
        content = await service.get(machine_id)
        return ObjectResponse(content=content)

    #
    # @put(DETAIL_ROUTE)
    # async def update_author(
    #     self, data: Machine, service: Service, author_id: UUID
    # ) -> Machine:
    #     """Update an author."""
    #     return await service.update(author_id, data)
    #
    # @delete(DETAIL_ROUTE, status_code=HTTP_200_OK)
    # async def delete_author(self, service: Service, author_id: UUID) -> Machine:
    #     """Delete Author by ID."""
    #     return await service.delete(author_id)