from typing import Any

from fastapi import APIRouter, Depends, HTTPException, Path, Query
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy.orm.attributes import InstrumentedAttribute

from api.depends import get_session, verify_admin_token
from database.models import Admin


def cast_identifier_type(field: InstrumentedAttribute, value: int | str):
    column_type = type(field.property.columns[0].type).__name__
    if column_type in ("Integer", "BigInteger"):
        return int(value)
    return value


def normalize_outgoing_object(obj: object) -> None:
    if hasattr(obj, "vless") and getattr(obj, "vless") is None:
        setattr(obj, "vless", False)


def to_schema(schema_response: type, obj: object):
    normalize_outgoing_object(obj)
    return schema_response.model_validate(obj, from_attributes=True)


def generate_crud_router(
    *,
    model: type,
    schema_response: type,
    schema_create: type,
    schema_update: type,
    identifier_field: str = "tg_id",
    parameter_name: str = "tg_id",
    extra_get_by_email: bool = False,
    enabled_methods: list[str] = ("get_all", "get_one", "get_by_email", "create", "update", "delete"),
) -> APIRouter:
    router = APIRouter()

    if "get_all" in enabled_methods:

        @router.get("/", response_model=list[schema_response])
        async def get_all(
            admin: Admin = Depends(verify_admin_token),
            session: AsyncSession = Depends(get_session),
        ):
            result = await session.execute(select(model))
            items = result.scalars().all()
            for item in items:
                normalize_outgoing_object(item)
            return [schema_response.model_validate(item, from_attributes=True) for item in items]

    if "get_by_email" in enabled_methods and extra_get_by_email:

        @router.get("/by_email", response_model=schema_response)
        async def get_by_email(
            email: str = Query(...),
            admin: Admin = Depends(verify_admin_token),
            session: AsyncSession = Depends(get_session),
        ):
            result = await session.execute(select(model).where(model.email == email))
            obj = result.scalar_one_or_none()
            if not obj:
                raise HTTPException(status_code=404, detail="Not found by email")
            return to_schema(schema_response, obj)

    if "get_one" in enabled_methods:

        @router.get(f"/{{{parameter_name}}}", response_model=schema_response)
        async def get_one(
            value: int | str = Path(..., alias=parameter_name),
            admin: Admin = Depends(verify_admin_token),
            session: AsyncSession = Depends(get_session),
        ):
            field = getattr(model, identifier_field)
            casted = cast_identifier_type(field, value)
            result = await session.execute(select(model).where(field == casted))
            obj = result.scalar_one_or_none()
            if not obj:
                raise HTTPException(status_code=404, detail=f"{model.__name__} not found")
            return to_schema(schema_response, obj)

    if "get_all_by_field" in enabled_methods:

        @router.get(f"/all/{{{parameter_name}}}", response_model=list[schema_response])
        async def get_all_by_field(
            value: int | str = Path(..., alias=parameter_name),
            admin: Admin = Depends(verify_admin_token),
            session: AsyncSession = Depends(get_session),
        ):
            field = getattr(model, identifier_field)
            casted = cast_identifier_type(field, value)
            result = await session.execute(select(model).where(field == casted))
            objs = result.scalars().all()
            if not objs:
                raise HTTPException(status_code=404, detail=f"{model.__name__} not found")
            for obj in objs:
                normalize_outgoing_object(obj)
            return [schema_response.model_validate(obj, from_attributes=True) for obj in objs]

    if "create" in enabled_methods:

        @router.post("/", response_model=schema_response)
        async def create(
            payload: Any,
            admin: Admin = Depends(verify_admin_token),
            session: AsyncSession = Depends(get_session),
        ):
            validated = schema_create.model_validate(payload)
            data = validated.model_dump(exclude_unset=True)
            if "days" in data and data["days"] == 0:
                data["days"] = None
            obj = model(**data)
            session.add(obj)
            await session.commit()
            await session.refresh(obj)
            return to_schema(schema_response, obj)

    if "update" in enabled_methods:

        @router.patch(f"/{{{parameter_name}}}", response_model=schema_response)
        async def update(
            payload: Any,
            value: int | str = Path(..., alias=parameter_name),
            admin: Admin = Depends(verify_admin_token),
            session: AsyncSession = Depends(get_session),
        ):
            field = getattr(model, identifier_field)
            casted = cast_identifier_type(field, value)
            result = await session.execute(select(model).where(field == casted))
            obj = result.scalar_one_or_none()
            if not obj:
                raise HTTPException(status_code=404, detail=f"{model.__name__} not found")

            validated = schema_update.model_validate(payload)
            for k, v in validated.model_dump(exclude_unset=True).items():
                setattr(obj, k, v)

            await session.commit()
            await session.refresh(obj)
            return to_schema(schema_response, obj)

    if "delete" in enabled_methods:

        @router.delete(f"/{{{parameter_name}}}", response_model=dict)
        async def delete(
            value: int | str = Path(..., alias=parameter_name),
            admin: Admin = Depends(verify_admin_token),
            session: AsyncSession = Depends(get_session),
        ):
            field = getattr(model, identifier_field)
            casted = cast_identifier_type(field, value)
            result = await session.execute(select(model).where(field == casted))
            obj = result.scalar_one_or_none()
            if not obj:
                raise HTTPException(status_code=404, detail=f"{model.__name__} not found")

            await session.delete(obj)
            await session.commit()
            return {"detail": f"{model.__name__} deleted"}

    return router