"""用户与节点登记。"""

from __future__ import annotations

from decimal import Decimal
from urllib.parse import urlparse

from sqlalchemy import select
from sqlalchemy.exc import IntegrityError
from sqlalchemy.orm import Session

from app.clock import add_months, utcnow
from app.config import settings
from app.errors import AppError
from app.models import ComputeNode, NodeStatus, User, UserRole
from app.money import money
from app.services.common import get_user_by_wallet


def register_user(
    session: Session,
    wallet_address: str,
    username: str | None = None,
    password_hash: str | None = None,
    role: UserRole = UserRole.USER,
) -> User:
    wallet = wallet_address.strip()
    if session.scalar(select(User).where(User.wallet_address == wallet)) is not None:
        raise AppError("钱包地址已注册", 409)
    if username and session.scalar(select(User).where(User.username == username)) is not None:
        raise AppError("用户名已占用", 409)
    user = User(
        wallet_address=wallet,
        username=username,
        password_hash=password_hash,
        role=role,
        created_at=utcnow(),
    )
    session.add(user)
    try:
        session.flush()
    except IntegrityError as exc:
        session.rollback()
        raise AppError("钱包地址或用户名已注册", 409) from exc
    return user


def register_node(
    session: Session,
    wallet_address: str,
    sn: str,
    purchase_amount: Decimal,
    callback_url: str | None = None,
    node_token: str | None = None,
) -> ComputeNode:
    user = get_user_by_wallet(session, wallet_address.strip())
    serial = sn.strip()
    if session.scalar(select(ComputeNode).where(ComputeNode.sn == serial)) is not None:
        raise AppError("节点序列号已存在", 409)
    callback = _normalize_callback(callback_url)
    started = utcnow()
    node = ComputeNode(
        user_id=user.id,
        sn=serial,
        purchase_amount=money(purchase_amount),
        license_months=settings.license_months,
        licensed_at=started,
        license_expires_at=add_months(started, settings.license_months),
        status=NodeStatus.OFFLINE,
        callback_url=callback,
        node_token=node_token,
        created_at=started,
        updated_at=started,
    )
    session.add(node)
    try:
        session.flush()
    except IntegrityError as exc:
        session.rollback()
        raise AppError("节点序列号已存在", 409) from exc
    return node


def _normalize_callback(callback_url: str | None) -> str | None:
    if callback_url is None or callback_url.strip() == "":
        return None
    parsed = urlparse(callback_url.strip())
    if parsed.scheme not in {"http", "https"} or not parsed.netloc:
        raise AppError("callback_url 必须是 http 或 https 地址")
    return callback_url.strip()