"""
API Routes para gestión de Productos.
"""

from datetime import datetime
from typing import List, Optional
from fastapi import APIRouter, Depends, HTTPException, Query
from sqlalchemy.orm import Session
from pydantic import BaseModel

from app.core.database import get_db
from app.models.product import Product

router = APIRouter()


# ===========================================
# SCHEMAS
# ===========================================

class ProductCreate(BaseModel):
    name: str
    description: Optional[str] = None
    short_description: Optional[str] = None
    category: str
    subcategory: Optional[str] = None
    brand: Optional[str] = None
    model: Optional[str] = None
    price: float
    price_usd: Optional[float] = None
    stock: int = 0
    specs: Optional[dict] = None
    images: Optional[List[str]] = None
    main_image: Optional[str] = None
    tags: Optional[List[str]] = None
    highlights: Optional[List[str]] = None
    is_featured: bool = False

    class Config:
        from_attributes = True


class ProductUpdate(BaseModel):
    name: Optional[str] = None
    description: Optional[str] = None
    short_description: Optional[str] = None
    category: Optional[str] = None
    subcategory: Optional[str] = None
    brand: Optional[str] = None
    model: Optional[str] = None
    price: Optional[float] = None
    price_usd: Optional[float] = None
    stock: Optional[int] = None
    is_available: Optional[bool] = None
    specs: Optional[dict] = None
    images: Optional[List[str]] = None
    main_image: Optional[str] = None
    tags: Optional[List[str]] = None
    highlights: Optional[List[str]] = None
    is_featured: Optional[bool] = None

    class Config:
        from_attributes = True


# ===========================================
# ENDPOINTS
# ===========================================

@router.get("/")
async def list_products(
    category: Optional[str] = Query(None),
    brand: Optional[str] = Query(None),
    is_available: Optional[bool] = Query(None),
    is_featured: Optional[bool] = Query(None),
    min_price: Optional[float] = Query(None),
    max_price: Optional[float] = Query(None),
    limit: int = Query(50, le=100),
    offset: int = Query(0),
    db: Session = Depends(get_db)
):
    """Listar productos con filtros."""
    query = db.query(Product)

    if category:
        query = query.filter(Product.category == category)
    if brand:
        query = query.filter(Product.brand == brand)
    if is_available is not None:
        query = query.filter(Product.is_available == is_available)
    if is_featured is not None:
        query = query.filter(Product.is_featured == is_featured)
    if min_price is not None:
        query = query.filter(Product.price >= min_price)
    if max_price is not None:
        query = query.filter(Product.price <= max_price)

    products = query.order_by(Product.created_at.desc()).offset(offset).limit(limit).all()
    return [p.to_dict() for p in products]


@router.get("/categories")
async def list_categories(db: Session = Depends(get_db)):
    """Listar categorías únicas de productos."""
    categories = db.query(Product.category).distinct().all()
    return [c[0] for c in categories if c[0]]


@router.get("/featured")
async def list_featured_products(db: Session = Depends(get_db)):
    """Listar productos destacados."""
    products = db.query(Product).filter(
        Product.is_featured == True,
        Product.is_available == True
    ).all()
    return [p.to_dict() for p in products]


@router.get("/{product_id}")
async def get_product(product_id: int, db: Session = Depends(get_db)):
    """Obtener un producto por ID."""
    product = db.query(Product).filter(Product.id == product_id).first()
    if not product:
        raise HTTPException(status_code=404, detail="Producto no encontrado")
    return product.to_dict()


@router.post("/")
async def create_product(product_data: ProductCreate, db: Session = Depends(get_db)):
    """Crear un nuevo producto."""
    product = Product(**product_data.dict())
    db.add(product)
    db.commit()
    db.refresh(product)
    return product.to_dict()


@router.put("/{product_id}")
async def update_product(product_id: int, product_data: ProductUpdate, db: Session = Depends(get_db)):
    """Actualizar un producto."""
    product = db.query(Product).filter(Product.id == product_id).first()
    if not product:
        raise HTTPException(status_code=404, detail="Producto no encontrado")

    update_data = product_data.dict(exclude_unset=True)
    for field, value in update_data.items():
        setattr(product, field, value)

    product.updated_at = datetime.utcnow()
    db.commit()
    db.refresh(product)
    return product.to_dict()


@router.delete("/{product_id}")
async def delete_product(product_id: int, db: Session = Depends(get_db)):
    """Eliminar un producto."""
    product = db.query(Product).filter(Product.id == product_id).first()
    if not product:
        raise HTTPException(status_code=404, detail="Producto no encontrado")

    db.delete(product)
    db.commit()
    return {"message": "Producto eliminado", "product_id": product_id}


@router.post("/{product_id}/toggle-featured")
async def toggle_featured(product_id: int, db: Session = Depends(get_db)):
    """Alternar estado de producto destacado."""
    product = db.query(Product).filter(Product.id == product_id).first()
    if not product:
        raise HTTPException(status_code=404, detail="Producto no encontrado")

    product.is_featured = not product.is_featured
    db.commit()

    return {
        "message": f"Producto {'destacado' if product.is_featured else 'no destacado'}",
        "is_featured": product.is_featured
    }