"""
Analysis Sessions API endpoints.

Управление сессиями анализа (создание, получение, удаление).
"""

from fastapi import APIRouter, Depends, HTTPException, status, Query
from typing import Optional
from app.models.analysis import SessionCreate, SessionResponse, SessionList
from app.interfaces.db_api_client import DBApiClient
from app.dependencies import get_db_client, get_current_user
import httpx
import logging

logger = logging.getLogger(__name__)

router = APIRouter(prefix="/analysis", tags=["analysis"])


@router.post("/sessions", response_model=SessionResponse, status_code=status.HTTP_201_CREATED)
async def create_session(
    session: SessionCreate,
    current_user: dict = Depends(get_current_user),
    db_client: DBApiClient = Depends(get_db_client)
):
    """
    Создать новую сессию анализа.

    Args:
        session: Данные сессии (environment, api_mode, request, response, annotations)

    Returns:
        SessionResponse: Созданная сессия с session_id
    """
    user_id = current_user["user_id"]

    try:
        created_session = await db_client.save_session(user_id, session)
        return created_session
    except httpx.HTTPStatusError as e:
        if e.response.status_code == 404:
            raise HTTPException(
                status_code=status.HTTP_404_NOT_FOUND,
                detail="User not found"
            )
        elif e.response.status_code == 400:
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST,
                detail="Invalid session data format"
            )
        logger.error(f"Failed to create session: {e}")
        raise HTTPException(
            status_code=status.HTTP_502_BAD_GATEWAY,
            detail="Failed to create session in DB API"
        )
    except Exception as e:
        logger.error(f"Unexpected error creating session: {e}")
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail="Internal server error"
        )


@router.get("/sessions", response_model=SessionList)
async def get_sessions(
    environment: Optional[str] = Query(None, description="Фильтр по окружению (ift/psi/prod)"),
    limit: int = Query(50, ge=1, le=200, description="Лимит результатов"),
    offset: int = Query(0, ge=0, description="Смещение для пагинации"),
    current_user: dict = Depends(get_current_user),
    db_client: DBApiClient = Depends(get_db_client)
):
    """
    Получить список сессий пользователя.

    Args:
        environment: Фильтр по окружению (опционально)
        limit: Лимит результатов (default: 50, max: 200)
        offset: Смещение для пагинации (default: 0)

    Returns:
        SessionList: Список сессий с total count
    """
    user_id = current_user["user_id"]

    try:
        sessions = await db_client.get_sessions(user_id, environment, limit, offset)
        return sessions
    except httpx.HTTPStatusError as e:
        if e.response.status_code == 404:
            raise HTTPException(
                status_code=status.HTTP_404_NOT_FOUND,
                detail="User not found"
            )
        logger.error(f"Failed to get sessions: {e}")
        raise HTTPException(
            status_code=status.HTTP_502_BAD_GATEWAY,
            detail="Failed to retrieve sessions from DB API"
        )
    except Exception as e:
        logger.error(f"Unexpected error getting sessions: {e}")
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail="Internal server error"
        )


@router.get("/sessions/{session_id}", response_model=SessionResponse)
async def get_session(
    session_id: str,
    current_user: dict = Depends(get_current_user),
    db_client: DBApiClient = Depends(get_db_client)
):
    """
    Получить конкретную сессию по ID.

    Args:
        session_id: UUID сессии

    Returns:
        SessionResponse: Полная информация о сессии
    """
    user_id = current_user["user_id"]

    try:
        session = await db_client.get_session(user_id, session_id)
        return session
    except httpx.HTTPStatusError as e:
        if e.response.status_code == 404:
            raise HTTPException(
                status_code=status.HTTP_404_NOT_FOUND,
                detail="Session not found"
            )
        logger.error(f"Failed to get session {session_id}: {e}")
        raise HTTPException(
            status_code=status.HTTP_502_BAD_GATEWAY,
            detail="Failed to retrieve session from DB API"
        )
    except Exception as e:
        logger.error(f"Unexpected error getting session {session_id}: {e}")
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail="Internal server error"
        )


@router.delete("/sessions/{session_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_session(
    session_id: str,
    current_user: dict = Depends(get_current_user),
    db_client: DBApiClient = Depends(get_db_client)
):
    """
    Удалить сессию.

    Args:
        session_id: UUID сессии

    Returns:
        204 No Content при успехе
    """
    user_id = current_user["user_id"]

    try:
        await db_client.delete_session(user_id, session_id)
        return None
    except httpx.HTTPStatusError as e:
        if e.response.status_code == 404:
            raise HTTPException(
                status_code=status.HTTP_404_NOT_FOUND,
                detail="Session not found"
            )
        logger.error(f"Failed to delete session {session_id}: {e}")
        raise HTTPException(
            status_code=status.HTTP_502_BAD_GATEWAY,
            detail="Failed to delete session in DB API"
        )
    except Exception as e:
        logger.error(f"Unexpected error deleting session {session_id}: {e}")
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail="Internal server error"
        )