from fastapi import FastAPI, HTTPException, 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, date
from jose import jwt
import bcrypt, os, traceback
from dotenv import load_dotenv

load_dotenv()

SECRET_KEY = "SZUPER_TITKOS_KULCS_2026"
ALGORITHM = "HS256"
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()

# --- AUTH ---
def get_password_hash(p): return bcrypt.hashpw(p.encode('utf-8')[:72], bcrypt.gensalt()).decode('utf-8')
def verify_password(p, h): return bcrypt.checkpw(p.encode('utf-8')[:72], h.encode('utf-8'))

async def get_current_user(token: str = Depends(oauth2_scheme)):
    try:
        p = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
        return int(p.get("sub"))
    except: raise HTTPException(status_code=401)

@app.post("/api/auth/register")
async def register(email: str = Form(...), password: str = Form(...)):
    try:
        async with AsyncSessionLocal() as session:
            async with session.begin():
                await session.execute(text("INSERT INTO data.users (email, password_hash) VALUES (:e, :p)"), 
                                    {"e": email, "p": get_password_hash(password)})
        return {"status": "success"}
    except Exception as e:
        return JSONResponse(status_code=400, content={"detail": "Email már létezik vagy adatbázis hiba."})

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

# --- DATA ---
@app.get("/api/meta/vehicle-hierarchy")
async def get_hierarchy():
    async with AsyncSessionLocal() as session:
        q = text("SELECT vm.category, m.name as brand, vm.id as model_id, vm.model_name FROM ref.vehicle_models vm JOIN ref.vehicle_makes m ON vm.make_id = m.id ORDER BY vm.category, m.name")
        res = await session.execute(q)
        h = {}
        for r in res:
            if r.category not in h: h[r.category] = {}
            if r.brand not in h[r.category]: h[r.category][r.brand] = []
            h[r.category][r.brand].append({"id": r.model_id, "name": r.model_name})
        return h

@app.get("/api/meta/cost-types")
async def get_cost_types():
    async with AsyncSessionLocal() as session:
        res = await session.execute(text("SELECT code, name FROM ref.cost_types ORDER BY name"))
        return {r.code: r.name for r in res.fetchall()}

@app.get("/api/my_vehicles")
async def my_vehicles(uid: 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 AND vh.end_date IS NULL")
        res = await session.execute(q, {"uid": uid})
        return [dict(r._mapping) for r in res.fetchall()]

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