from fastapi import FastAPI, HTTPException, UploadFile, File, Form, Depends
from fastapi.responses import FileResponse, JSONResponse
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from pydantic import BaseModel
from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession
from sqlalchemy.orm import sessionmaker
from sqlalchemy import text
from datetime import datetime, timedelta
from jose import JWTError, jwt
from passlib.context import CryptContext
import os, uuid, shutil
from dotenv import load_dotenv

load_dotenv()

SECRET_KEY = "SZUPER_TITKOS_KULCS_2026"
ALGORITHM = "HS256"
pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="api/auth/login")

DATABASE_URL = os.getenv("DATABASE_URL", "").replace("postgresql://", "postgresql+asyncpg://")
engine = create_async_engine(DATABASE_URL, pool_pre_ping=True)
AsyncSessionLocal = sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)

app = FastAPI()

def get_password_hash(password): return pwd_context.hash(password)
def verify_password(plain, hashed): return pwd_context.verify(plain, hashed)

async def get_current_user(token: str = Depends(oauth2_scheme)):
    try:
        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
        user_id: str = payload.get("sub")
        if user_id is None: raise HTTPException(status_code=401)
        return int(user_id)
    except Exception: raise HTTPException(status_code=401)

@app.post("/api/auth/register")
async def register(email: str = Form(...), password: str = Form(...)):
    async with AsyncSessionLocal() as session:
        async with session.begin():
            hashed = get_password_hash(password)
            await session.execute(text("INSERT INTO data.users (email, password_hash) VALUES (:e, :p)"), {"e": email, "p": hashed})
            return {"status": "success"}

@app.post("/api/auth/login")
async def login(form_data: OAuth2PasswordRequestForm = Depends()):
    async with AsyncSessionLocal() as session:
        res = await session.execute(text("SELECT id, password_hash FROM data.users WHERE email = :e"), {"e": form_data.username})
        user = res.fetchone()
        if not user or not verify_password(form_data.password, user.password_hash):
            raise HTTPException(status_code=401, detail="Hibás adatok")
        token = jwt.encode({"sub": str(user.id), "exp": datetime.utcnow() + timedelta(days=1)}, SECRET_KEY, algorithm=ALGORITHM)
        return {"access_token": token, "token_type": "bearer"}

@app.get("/api/my_vehicles")
async def my_vehicles(user_id: int = Depends(get_current_user)):
    async with AsyncSessionLocal() as session:
        q = text("SELECT v.id as vehicle_id, v.current_plate as plate, m.name as brand, mo.model_name as model, v.status FROM data.vehicle_history vh JOIN data.vehicles v ON vh.vehicle_id = v.id JOIN ref.vehicle_models mo ON v.model_id = mo.id JOIN ref.vehicle_makes m ON mo.make_id = m.id WHERE vh.user_id = :uid")
        res = await session.execute(q, {"uid": user_id})
        return [dict(r._mapping) for r in res.fetchall()]

@app.get("/api/ref/cost_types")
async def cost_types():
    async with AsyncSessionLocal() as session:
        res = await session.execute(text("SELECT code, name, parent_code FROM ref.cost_types"))
        rows = res.fetchall()
        tree = {}
        for r in rows:
            if not r.parent_code: tree[r.code] = {"label": r.name, "subs": {}}
        for r in rows:
            if r.parent_code and r.parent_code in tree: tree[r.parent_code]["subs"][r.code] = r.name
        return tree

@app.get("/")
async def index(): return FileResponse("/app/frontend/index.html")