from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.orm import Session
from typing import List, Optional
from app.database.database import get_db
from app.models import Model, User
from app.schemas.model import ModelCreate, ModelUpdate, ModelResponse
from app.services.auth import get_current_admin_user

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


@router.get("", response_model=List[ModelResponse])
def get_models(
    category_id: Optional[int] = None,
    brand: Optional[str] = None,
    db: Session = Depends(get_db)
):
    """Get all models with optional filtering by category and brand"""
    query = db.query(Model)
    
    if category_id:
        query = query.filter(Model.category_id == category_id)
    if brand:
        query = query.filter(Model.brand.ilike(f"%{brand}%"))
    
    return query.all()


@router.get("/{model_id}", response_model=ModelResponse)
def get_model(model_id: int, db: Session = Depends(get_db)):
    """Get a specific model by ID"""
    model = db.query(Model).filter(Model.id == model_id).first()
    if not model:
        raise HTTPException(status_code=404, detail="Model not found")
    return model


@router.post("", response_model=ModelResponse)
def create_model(
    model_data: ModelCreate,
    db: Session = Depends(get_db),
    admin: User = Depends(get_current_admin_user)
):
    """Create a new model (admin only)"""
    # Check if model with same name, category, and brand already exists
    existing = db.query(Model).filter(
        Model.name == model_data.name,
        Model.category_id == model_data.category_id,
        Model.brand == model_data.brand
    ).first()
    
    if existing:
        raise HTTPException(
            status_code=400,
            detail=f"Model '{model_data.name}' already exists for brand '{model_data.brand}' in this category"
        )
    
    db_model = Model(**model_data.dict())
    db.add(db_model)
    db.commit()
    db.refresh(db_model)
    return db_model


@router.put("/{model_id}", response_model=ModelResponse)
def update_model(
    model_id: int,
    model_update: ModelUpdate,
    db: Session = Depends(get_db),
    admin: User = Depends(get_current_admin_user)
):
    """Update a model (admin only)"""
    model = db.query(Model).filter(Model.id == model_id).first()
    if not model:
        raise HTTPException(status_code=404, detail="Model not found")
    
    for field, value in model_update.dict(exclude_unset=True).items():
        setattr(model, field, value)
    
    db.commit()
    db.refresh(model)
    return model


@router.delete("/{model_id}")
def delete_model(
    model_id: int,
    db: Session = Depends(get_db),
    admin: User = Depends(get_current_admin_user)
):
    """Delete a model (admin only)"""
    model = db.query(Model).filter(Model.id == model_id).first()
    if not model:
        raise HTTPException(status_code=404, detail="Model not found")
    
    db.delete(model)
    db.commit()
    return {"message": "Model deleted successfully"}


@router.get("/brands/list")
def get_brands(db: Session = Depends(get_db)):
    """Get list of unique brands"""
    brands = db.query(Model.brand).distinct().all()
    return [brand[0] for brand in brands if brand[0]]