import time
from typing import Any

from fastapi import APIRouter, Depends, HTTPException
from fastapi.responses import JSONResponse

from app.dependencies import get_api_logger, get_category_service
from app.schemas.categories import CategorizeRequest, CategorizeResponse
from app.services.autocategorizer import AutoCategoryService
from app.services.api_logger import ApiLogger

router = APIRouter()


@router.post("/categorize", response_model=CategorizeResponse, summary="Categorize a transaction note")
async def categorize_transaction(
    payload: CategorizeRequest,
    service: AutoCategoryService = Depends(get_category_service),
    api_logger: ApiLogger = Depends(get_api_logger),
) -> CategorizeResponse | JSONResponse:
    started_at = time.monotonic()
    try:
        result = await service.categorize(payload.notes, payload.user_id)
        await api_logger.log_categorization(
            name="Auto Expense Categorization",
            status="success",
            response_time=time.monotonic() - started_at,
            user_id=payload.user_id,
        )
        return CategorizeResponse(status="success", data=result, message="Categorization logged in database.")
    except HTTPException as exc:
        await api_logger.log_categorization(
            name="Auto Expense Categorization",
            status="fail",
            response_time=time.monotonic() - started_at,
            user_id=payload.user_id,
            error_message=_normalize_error_detail(exc.detail),
        )
        return JSONResponse(
            status_code=exc.status_code,
            content={"status": "fail", "message": _normalize_error_detail(exc.detail)},
        )
    except Exception as exc:
        error_message = str(exc)
        error_type = type(exc).__name__
        await api_logger.log_categorization(
            name="Auto Expense Categorization",
            status="fail",
            response_time=time.monotonic() - started_at,
            user_id=payload.user_id,
            error_message=f"{error_type}: {error_message}",
        )
        # Include error details for debugging (in production, you might want to hide this)
        return JSONResponse(
            status_code=500,
            content={
                "status": "fail",
                "message": f"Internal server error: {error_type} - {error_message}",
            },
        )


def _normalize_error_detail(detail: Any) -> str:
    if isinstance(detail, str):
        return detail
    return str(detail)