# -*- coding: utf-8 -*-
"""业务层 · 用户管理服务（角色分配提权防护 + 建号联动默认身份）。"""
from __future__ import annotations

import re
import secrets

from fastapi import HTTPException

from ..infrastructure.repositories import Database

# 11 位大陆手机号
PHONE_RE = re.compile(r"^1[3-9]\d{9}$")


def validate_phone(phone: str) -> str:
    """校验并归一化手机号；不合法抛 400。"""
    p = (phone or "").strip()
    if not PHONE_RE.match(p):
        raise HTTPException(status_code=400, detail="手机号格式不正确（需为 11 位大陆手机号）")
    return p


async def create_username(db: Database) -> str:
    """生成随机账号（u_<20hex>），全局唯一，账号不可由用户指定。"""
    for _ in range(8):
        uname = f"u_{secrets.token_hex(10)}"
        if await db.users.get_by_username(uname) is None:
            return uname
    raise HTTPException(status_code=500, detail="账号生成失败，请重试")

class UserAdminService:
    """运营端账号/角色管理。"""

    def __init__(self, db: Database):
        self.db = db

    async def _validate_role_assignment(self, actor: dict, role: str, sub_role: str | None) -> None:
        """白名单 + 提权防护：拒绝非法角色组合，及无权者创建/提升特权角色。"""
        key = role if not sub_role else f"{role}|{sub_role}"
        if not await self.db.roles.role_exists(role):
            raise HTTPException(status_code=400, detail=f"无效角色: {role}")
        if sub_role and not await self.db.roles.role_exists(f"{role}|{sub_role}"):
            raise HTTPException(status_code=400, detail=f"无效角色组合: {key}")
        if "action:role.grant_perm" in await self.db.roles.permissions_for(role, sub_role) \
                and "action:role.grant_perm" not in actor.get("permissions", []):
            raise HTTPException(status_code=403, detail="无权创建/分配特权角色（仅超级管理员）")

    async def create_user(self, req, actor: dict) -> dict:
        """创建账号（系统随机生成）+ 自动创建默认端口身份（含提权防护）。

        规则：手机号必填且全局唯一；账号(username)随机生成，不可指定。
        """
        phone = validate_phone(getattr(req, "phone", ""))
        if not req.password.strip():
            raise HTTPException(status_code=400, detail="密码必填")
        if await self.db.users.find_by_phone(phone) is not None:
            raise HTTPException(status_code=400, detail="手机号已被使用")
        await self._validate_role_assignment(actor, req.role, req.sub_role)
        username = await create_username(self.db)
        user = await self.db.users.create(
            username, req.password, nickname=req.nickname,
            phone=phone,
            role=req.role, sub_role=req.sub_role, org_id=req.org_id, region_id=req.region_id,
            source="admin", auth_type="admin",
        )
        return user

    async def bind_phone(self, user_id: str, phone: str) -> dict:
        """为用户绑定/更换手机号（格式校验 + 全局唯一，排除自身）。"""
        p = validate_phone(phone)
        existing = await self.db.users.find_by_phone(p)
        if existing is not None and existing["id"] != user_id:
            raise HTTPException(status_code=400, detail="手机号已被其他用户使用")
        u = await self.db.users.update_profile(user_id, {"phone": p})
        if u is None:
            raise HTTPException(status_code=404, detail="用户不存在")
        return u

    async def set_user_role(self, actor: dict, user_id: str, role: str, sub_role: str, org_id: str, region_id: str) -> dict:
        """分配角色（含提权防护，同步主身份并失效旧令牌）。"""
        await self._validate_role_assignment(actor, role, sub_role)
        return await self.db.users.set_role(user_id, role, sub_role, org_id, region_id)