from fastapi import APIRouter, Depends, HTTPException, Query
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select
from app.db.session import get_db
from app.services.asset_service import AssetService
from app.api import deps
from app.models.vehicle import BodyTypeDictionary
from typing import List, Optional

router = APIRouter()

# Secured endpoint: Closed premium ecosystem
@router.get("/makes", response_model=List[str])
async def list_makes(
    vehicle_class: Optional[str] = None,
    db: AsyncSession = Depends(get_db),
    current_user = Depends(deps.get_current_user)
):
    """1. Szint: Márkák listázása, opcionálisan vehicle_class szerint szűrve."""
    return await AssetService.get_makes(db, vehicle_class)

# Secured endpoint: Closed premium ecosystem
@router.get("/models", response_model=List[str])
async def list_models(
    make: str,
    vehicle_class: str = None,
    db: AsyncSession = Depends(get_db),
    current_user = Depends(deps.get_current_user)
):
    """2. Szint: Típusok listázása egy adott márkához, opcionálisan vehicle_class szerint szűrve."""
    # Handle empty or invalid parameters gracefully
    if not make or make.strip() == "":
        return []
    
    models = await AssetService.get_models(db, make, vehicle_class)
    # Return empty list instead of 404 - frontend can handle empty dropdown
    return models or []

# Secured endpoint: Closed premium ecosystem
@router.get("/generations", response_model=List[str])
async def list_generations(
    make: str,
    model: str,
    db: AsyncSession = Depends(get_db),
    current_user = Depends(deps.get_current_user)
):
    """3. Szint: Generációk/Évjáratok listázása."""
    # Handle empty or invalid parameters gracefully
    if not make or not model or make.strip() == "" or model.strip() == "":
        return []
    
    generations = await AssetService.get_generations(db, make, model)
    # Return empty list instead of 404 - frontend can handle empty dropdown
    return generations or []

# Secured endpoint: Closed premium ecosystem
@router.get("/engines")
async def list_engines(
    make: str,
    model: str,
    gen: str,
    db: AsyncSession = Depends(get_db),
    current_user = Depends(deps.get_current_user)
):
    """4. Szint: Motorváltozatok és technikai specifikációk."""
    engines = await AssetService.get_engines(db, make, model, gen)
    if not engines:
        raise HTTPException(status_code=404, detail="Nincs motorváltozat adat.")
    
    # Itt visszaküldjük a teljes katalógus objektumokat (ID, motorváltozat, specifikációk)
    return [
        {
            "id": e.id,
            "variant": e.engine_variant,
            "engine_code": e.engine_code,
            "fuel_type": e.fuel_type,
            "factory_data": e.factory_data
        } for e in engines
    ]


# Secured endpoint: Closed premium ecosystem
@router.get("/body-types")
async def list_body_types(
    vehicle_class: Optional[str] = Query(None, description="Szűrés járműosztályra (pl. personal, motorcycle, light_commercial)"),
    db: AsyncSession = Depends(get_db),
    current_user = Depends(deps.get_current_user)
):
    """Karosszéria-típus szótár lekérése. Opcionálisan szűrhető vehicle_class alapján."""
    stmt = select(BodyTypeDictionary).order_by(BodyTypeDictionary.name_hu)
    if vehicle_class:
        stmt = stmt.where(BodyTypeDictionary.vehicle_class == vehicle_class)
    result = await db.execute(stmt)
    rows = result.scalars().all()
    return [
        {
            "id": r.id,
            "vehicle_class": r.vehicle_class,
            "code": r.code,
            # --- 🏗️ i18n JSONB Migration (Phase 3) ---
            "name_i18n": r.name_i18n if r.name_i18n else {},
            # --- [DEPRECATED] Old columns (Phase 3) ---
            "name_hu": r.name_hu,
        }
        for r in rows
    ]


# ═══════════════════════════════════════════════════════════════════════════════
# NEW: Cascading Catalog Endpoints for Vehicle Wizard (Drill-down UI)
# ═══════════════════════════════════════════════════════════════════════════════

@router.get("/brands", response_model=List[str])
async def list_catalog_brands(
    vehicle_class: Optional[str] = Query(None, description="Szűrés járműosztályra (pl. personal, motorcycle)"),
    q: Optional[str] = Query(None, description="Keresési szöveg (autocomplete)"),
    db: AsyncSession = Depends(get_db),
    current_user = Depends(deps.get_current_user)
):
    """Márkák listája a vehicle_model_definitions táblából, autocomplete-hez.
    GET /catalog/brands?class=personal&q=bmw
    """
    return await AssetService.get_catalog_brands(db, vehicle_class, q)


@router.get("/brands/{brand}/models")
async def list_catalog_models(
    brand: str,
    vehicle_class: Optional[str] = Query(None, description="Szűrés járműosztályra"),
    db: AsyncSession = Depends(get_db),
    current_user = Depends(deps.get_current_user)
):
    """Adott márkához tartozó modellek listája.
    GET /catalog/brands/BMW/models
    """
    if not brand or brand.strip() == "":
        return []
    return await AssetService.get_catalog_models(db, brand, vehicle_class)


@router.get("/brands/{brand}/models/{model}/years")
async def list_catalog_years(
    brand: str,
    model: str,
    db: AsyncSession = Depends(get_db),
    current_user = Depends(deps.get_current_user)
):
    """Adott márkához és modellhez tartozó elérhető évjáratok.
    GET /catalog/brands/BMW/models/X5/years
    """
    if not brand or not model or brand.strip() == "" or model.strip() == "":
        return []
    return await AssetService.get_catalog_years(db, brand, model)


@router.get("/brands/{brand}/models/{model}/trims")
async def list_catalog_trims(
    brand: str,
    model: str,
    year: Optional[int] = Query(None, description="Szűrés évjáratra"),
    db: AsyncSession = Depends(get_db),
    current_user = Depends(deps.get_current_user)
):
    """Adott márkához, modellhez és opcionális évjárathoz tartozó felszereltségek/motorváltozatok.
    GET /catalog/brands/BMW/models/X5/trims?year=2023
    """
    if not brand or not model or brand.strip() == "" or model.strip() == "":
        return []
    return await AssetService.get_catalog_trims(db, brand, model, year)