"""
Models Router - Proxy to Model Service
"""
from fastapi import APIRouter, HTTPException, Depends, BackgroundTasks
from fastapi.responses import JSONResponse
from typing import List, Optional
import httpx
import asyncio
from shared.config import settings
from shared.auth import get_current_user
from shared.models.user import User
from shared.models.model import ModelRequest, ModelResponse, ModelList

router = APIRouter()

# Model service URL
MODEL_SERVICE_URL = f"http://model-service:8001"


@router.get("/models", response_model=List[ModelList])
async def list_models(
    current_user: User = Depends(get_current_user),
    skip: int = 0,
    limit: int = 100
):
    """List available models"""
    try:
        async with httpx.AsyncClient() as client:
            response = await client.get(
                f"{MODEL_SERVICE_URL}/models",
                params={"skip": skip, "limit": limit},
                headers={"Authorization": f"Bearer {current_user.token}"}
            )
            response.raise_for_status()
            return response.json()
    except httpx.HTTPError as e:
        raise HTTPException(status_code=500, detail=f"Model service error: {str(e)}")


@router.post("/models/{model_id}/predict", response_model=ModelResponse)
async def predict(
    model_id: str,
    request: ModelRequest,
    background_tasks: BackgroundTasks,
    current_user: User = Depends(get_current_user)
):
    """Make prediction with specified model"""
    try:
        async with httpx.AsyncClient() as client:
            response = await client.post(
                f"{MODEL_SERVICE_URL}/models/{model_id}/predict",
                json=request.dict(),
                headers={"Authorization": f"Bearer {current_user.token}"}
            )
            response.raise_for_status()
            
            # Log prediction request
            background_tasks.add_task(
                log_prediction_request,
                model_id,
                current_user.id,
                request
            )
            
            return response.json()
    except httpx.HTTPError as e:
        raise HTTPException(status_code=500, detail=f"Model service error: {str(e)}")


@router.get("/models/{model_id}", response_model=ModelList)
async def get_model(
    model_id: str,
    current_user: User = Depends(get_current_user)
):
    """Get model details"""
    try:
        async with httpx.AsyncClient() as client:
            response = await client.get(
                f"{MODEL_SERVICE_URL}/models/{model_id}",
                headers={"Authorization": f"Bearer {current_user.token}"}
            )
            response.raise_for_status()
            return response.json()
    except httpx.HTTPError as e:
        raise HTTPException(status_code=500, detail=f"Model service error: {str(e)}")


@router.post("/models/{model_id}/train")
async def train_model(
    model_id: str,
    training_data: dict,
    background_tasks: BackgroundTasks,
    current_user: User = Depends(get_current_user)
):
    """Start model training"""
    try:
        async with httpx.AsyncClient() as client:
            response = await client.post(
                f"{MODEL_SERVICE_URL}/models/{model_id}/train",
                json=training_data,
                headers={"Authorization": f"Bearer {current_user.token}"}
            )
            response.raise_for_status()
            
            # Log training request
            background_tasks.add_task(
                log_training_request,
                model_id,
                current_user.id,
                training_data
            )
            
            return response.json()
    except httpx.HTTPError as e:
        raise HTTPException(status_code=500, detail=f"Model service error: {str(e)}")


@router.get("/models/{model_id}/status")
async def get_model_status(
    model_id: str,
    current_user: User = Depends(get_current_user)
):
    """Get model training status"""
    try:
        async with httpx.AsyncClient() as client:
            response = await client.get(
                f"{MODEL_SERVICE_URL}/models/{model_id}/status",
                headers={"Authorization": f"Bearer {current_user.token}"}
            )
            response.raise_for_status()
            return response.json()
    except httpx.HTTPError as e:
        raise HTTPException(status_code=500, detail=f"Model service error: {str(e)}")


async def log_prediction_request(model_id: str, user_id: str, request: ModelRequest):
    """Log prediction request for analytics"""
    # Implementation would log to database or analytics service
    pass


async def log_training_request(model_id: str, user_id: str, training_data: dict):
    """Log training request for analytics"""
    # Implementation would log to database or analytics service
    pass