# -*- coding: utf-8 -*-
"""账号名称副本编号、登录标识类型推断。"""
from __future__ import annotations

import re
from typing import Iterable, Optional

_COPY_SUFFIX_RE = re.compile(r"^(.*?)(?: 副本(?: (\d+))?)?$")
_EMAIL_RE = re.compile(r"^[^@\s]+@[^@\s]+\.[^@\s]+$")
_CN_MOBILE_RE = re.compile(r"^1\d{10}$")
_PHONE_RE = re.compile(r"^\+?\d{8,15}$")
_PHONE_STRIP_RE = re.compile(r"[\s\-()]")

KNOWN_LOGIN_ID_TYPES = frozenset(
    {"email", "username", "phone", "customer_code", "api_account", "unknown"}
)
KNOWN_ACCOUNT_STATUSES = frozenset({"active", "disabled", "needs_review"})


def infer_login_id_type(login_id: Optional[str]) -> str:
    """从登录标识猜类型；空则 unknown。"""
    text = (login_id or "").strip()
    if not text:
        return "unknown"
    if _EMAIL_RE.match(text):
        return "email"
    compact = _PHONE_STRIP_RE.sub("", text)
    if _CN_MOBILE_RE.match(compact) or _PHONE_RE.match(compact):
        return "phone"
    return "username"


def resolve_login_id_type(explicit: Optional[str], login_id: Optional[str]) -> str:
    """有明确类型（且不是 unknown）时用明确值，否则按 login_id 推断。"""
    typed = (explicit or "").strip()
    if typed and typed != "unknown":
        return typed
    return infer_login_id_type(login_id)


def next_copy_label(source_label: str, existing_labels: Iterable[str]) -> str:
    """在已有名称中生成「原名 副本」/「原名 副本 2」…，避免叠「副本 副本」。"""
    raw = (source_label or "").strip() or "账号"
    existing = {item.strip().lower() for item in existing_labels if (item or "").strip()}
    match = _COPY_SUFFIX_RE.match(raw)
    stem = (match.group(1).strip() if match else raw) or raw
    n = 1
    while n <= 9999:
        candidate = f"{stem} 副本" if n == 1 else f"{stem} 副本 {n}"
        if candidate.lower() not in existing:
            return candidate
        n += 1
    return f"{stem} 副本 {n}"