"""
N8N Webhook Proxy Router
Безопасное проксирование запросов к n8n webhooks.
Frontend не знает прямых URL webhooks!
"""
import httpx
import logging
from fastapi import APIRouter, HTTPException, File, UploadFile, Form, Request
from fastapi.responses import JSONResponse
from typing import Optional

from ..config import settings

logger = logging.getLogger(__name__)
router = APIRouter(prefix="/api/n8n", tags=["n8n-proxy"])


# URL webhooks из .env (будут добавлены)
N8N_POLICY_CHECK_WEBHOOK = getattr(settings, 'n8n_policy_check_webhook', None)
N8N_FILE_UPLOAD_WEBHOOK = getattr(settings, 'n8n_file_upload_webhook', None)


@router.post("/policy/check")
async def proxy_policy_check(request: Request):
    """
    Проксирует проверку полиса к n8n webhook
    
    Frontend отправляет: POST /api/n8n/policy/check
    Backend проксирует к: https://n8n.clientright.pro/webhook/{uuid}
    """
    if not N8N_POLICY_CHECK_WEBHOOK:
        raise HTTPException(status_code=500, detail="N8N webhook не настроен")
    
    try:
        # Получаем JSON body от фронтенда
        body = await request.json()
        
        logger.info(f"🔄 Proxy policy check: {body.get('policy_number', 'unknown')}")
        
        # Проксируем запрос к n8n
        async with httpx.AsyncClient(timeout=30.0) as client:
            response = await client.post(
                N8N_POLICY_CHECK_WEBHOOK,
                json=body,
                headers={"Content-Type": "application/json"}
            )
            
            if response.status_code == 200:
                logger.info(f"✅ Policy check success")
                return response.json()
            else:
                logger.error(f"❌ N8N returned {response.status_code}: {response.text}")
                raise HTTPException(
                    status_code=response.status_code,
                    detail=f"N8N error: {response.text}"
                )
                
    except httpx.TimeoutException:
        logger.error("⏱️ N8N webhook timeout")
        raise HTTPException(status_code=504, detail="Таймаут подключения к n8n")
    except Exception as e:
        logger.error(f"❌ Error proxying to n8n: {e}")
        raise HTTPException(status_code=500, detail=f"Ошибка проверки полиса: {str(e)}")


@router.post("/upload/file")
async def proxy_file_upload(
    file: UploadFile = File(...),
    claim_id: Optional[str] = Form(None),
    voucher: Optional[str] = Form(None),
    session_id: Optional[str] = Form(None),
    file_type: Optional[str] = Form(None)
):
    """
    Проксирует загрузку файла к n8n webhook
    
    Frontend отправляет: POST /api/n8n/upload/file (multipart/form-data)
    Backend проксирует к: https://n8n.clientright.pro/webhook/{uuid}
    """
    if not N8N_FILE_UPLOAD_WEBHOOK:
        raise HTTPException(status_code=500, detail="N8N upload webhook не настроен")
    
    try:
        logger.info(f"🔄 Proxy file upload: {file.filename} for claim {claim_id}")
        
        # Читаем файл
        file_content = await file.read()
        
        # Формируем multipart/form-data для n8n
        files = {
            'file': (file.filename, file_content, file.content_type)
        }
        
        data = {}
        if claim_id:
            data['claim_id'] = claim_id
        if voucher:
            data['voucher'] = voucher
        if session_id:
            data['session_id'] = session_id
        if file_type:
            data['file_type'] = file_type
        
        # Проксируем запрос к n8n
        async with httpx.AsyncClient(timeout=60.0) as client:
            response = await client.post(
                N8N_FILE_UPLOAD_WEBHOOK,
                files=files,
                data=data
            )
            
            if response.status_code == 200:
                logger.info(f"✅ File upload success")
                return response.json()
            else:
                logger.error(f"❌ N8N returned {response.status_code}: {response.text}")
                raise HTTPException(
                    status_code=response.status_code,
                    detail=f"N8N error: {response.text}"
                )
                
    except httpx.TimeoutException:
        logger.error("⏱️ N8N webhook timeout")
        raise HTTPException(status_code=504, detail="Таймаут загрузки файла")
    except Exception as e:
        logger.error(f"❌ Error proxying file to n8n: {e}")
        raise HTTPException(status_code=500, detail=f"Ошибка загрузки файла: {str(e)}")