from fastapi import APIRouter, Depends, HTTPException, Query, Body
from sqlalchemy.orm import Session
from app.core.db import get_db
from app.models import AIModel, Meeting, TranscriptTask, SummarizeTask
from app.schemas.ai_model import AIModelOut, AIModelCreate, AIModelUpdate
from typing import List, Optional
import httpx

router = APIRouter(prefix="/ai-models", tags=["ai-models"])


@router.post("/fetch-remote-models")
async def fetch_remote_models(base_url: str = Body(..., embed=True)):
    """
    Fetch available models from a remote ASR server.
    """
    try:
        url = base_url.rstrip('/') + "/api/asrconfig"
        
        async with httpx.AsyncClient() as client:
            resp = await client.get(url, timeout=5.0)
            
            if resp.status_code != 200:
                raise HTTPException(status_code=400, detail=f"Failed to connect: {resp.status_code}")
                
            data = resp.json()
            
            # Check for standard response format (code 200 or 0 for success)
            is_success = False
            if isinstance(data, dict):
                code = data.get("code")
                if code == 0 or code == 200:
                    is_success = True
            
            if is_success and "data" in data:
                available_models = data["data"].get("available_models", [])
                return {"models": available_models}
            else:
                raise HTTPException(status_code=400, detail="Invalid response format from ASR server")
                 
    except httpx.RequestError as e:
        raise HTTPException(status_code=400, detail=f"Network error: {str(e)}")
    except Exception as e:
        raise HTTPException(status_code=400, detail=f"Error: {str(e)}")


@router.get("", response_model=List[AIModelOut])
def list_ai_models(
    model_type: Optional[str] = Query(None, pattern="^(asr|llm)$"),
    db: Session = Depends(get_db)
):
    query = db.query(AIModel)
    if model_type:
        query = query.filter(AIModel.model_type == model_type)
    return query.order_by(AIModel.created_at.desc()).all()


@router.post("", response_model=AIModelOut)
def create_ai_model(payload: AIModelCreate, db: Session = Depends(get_db)):
    # Convert boolean to int for SmallInteger field
    data = payload.model_dump()
    if 'is_default' in data:
        data['is_default'] = int(data['is_default'])
        
    # Logic: If set as default, unset others of same type
    if data.get('is_default'):
        db.query(AIModel).filter(AIModel.model_type == payload.model_type).update({"is_default": 0})
    
    item = AIModel(**data)
    db.add(item)
    db.commit()
    db.refresh(item)
    return item


@router.put("/{model_id}", response_model=AIModelOut)
def update_ai_model(model_id: int, payload: AIModelUpdate, db: Session = Depends(get_db)):
    item = db.query(AIModel).filter(AIModel.model_id == model_id).first()
    if not item:
        raise HTTPException(status_code=404, detail="Model not found")

    update_data = payload.model_dump(exclude_unset=True)
    
    if "is_default" in update_data:
        update_data["is_default"] = int(update_data["is_default"])
    
    if update_data.get("is_default"):
        # Unset others
        target_type = update_data.get("model_type", item.model_type)
        db.query(AIModel).filter(AIModel.model_type == target_type, AIModel.model_id != item.model_id).update({"is_default": 0})

    for k, v in update_data.items():
        setattr(item, k, v)
    
    db.commit()
    db.refresh(item)
    return item


from sqlalchemy.exc import IntegrityError

@router.delete("/{model_id}")
def delete_ai_model(model_id: int, db: Session = Depends(get_db)):
    item = db.query(AIModel).filter(AIModel.model_id == model_id).first()
    if not item:
        raise HTTPException(status_code=404, detail="Model not found")
    
    if item.is_default:
        raise HTTPException(status_code=400, detail="Cannot delete default model")

    try:
        # Manually unlink from related tables before deletion
        # Set asr_model_id to NULL in Meeting
        db.query(Meeting).filter(Meeting.asr_model_id == model_id).update({"asr_model_id": None})
        
        # Set model_id to NULL in TranscriptTask
        db.query(TranscriptTask).filter(TranscriptTask.model_id == model_id).update({"model_id": None})
        
        # Set model_id to NULL in SummarizeTask
        db.query(SummarizeTask).filter(SummarizeTask.model_id == model_id).update({"model_id": None})
        
        db.delete(item)
        db.commit()
    except IntegrityError:
        db.rollback()
        raise HTTPException(status_code=400, detail="该模型已被其他资源引用，无法删除")

    return {"status": "ok"}