from fastapi import APIRouter, Depends, HTTPException, Request, Response, status
from sqlalchemy.orm import Session

from app.core.config import settings
from app.core.deps import get_current_user
from app.core.security import create_access_token, hash_password, verify_password
from app.db.session import get_db
from app.models import User
from app.schemas import LoginRequest, RegisterRequest, UserResponse

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


@router.post("/register", response_model=UserResponse, status_code=status.HTTP_201_CREATED)
def register(payload: RegisterRequest, db: Session = Depends(get_db)):
    existing = db.query(User).filter(User.email == payload.email).first()
    if existing:
        raise HTTPException(status_code=400, detail="Email already registered")
    user = User(email=payload.email, password_hash=hash_password(payload.password))
    db.add(user)
    db.commit()
    db.refresh(user)
    return user


def _is_secure_request(request: Request) -> bool:
    forwarded_proto = request.headers.get("x-forwarded-proto", "")
    if "https" in forwarded_proto.lower():
        return True
    if request.url.scheme == "https":
        return True
    return settings.BACKEND_BASE_URL.startswith("https://")


@router.post("/login")
def login(payload: LoginRequest, request: Request, response: Response, db: Session = Depends(get_db)):
    user = db.query(User).filter(User.email == payload.email).first()
    if not user or not verify_password(payload.password, user.password_hash):
        raise HTTPException(status_code=401, detail="Invalid credentials")

    token = create_access_token(subject=user.id)
    response.set_cookie(
        key="access_token",
        value=token,
        httponly=True,
        samesite="lax",
        secure=_is_secure_request(request),
        max_age=60 * 60 * 24 * 7,
    )
    return {"message": "Logged in", "user": UserResponse.model_validate(user)}


@router.post("/logout")
def logout(response: Response):
    response.delete_cookie("access_token")
    return {"message": "Logged out"}


@router.get("/me", response_model=UserResponse)
def me(current_user: User = Depends(get_current_user)):
    return current_user