"""
用户服务层
提供用户相关的业务逻辑，供视图层调用
"""
import logging

from apps.users.models import User

logger = logging.getLogger(__name__)


class UserService:
    """用户业务逻辑服务"""

    @staticmethod
    def get_user_by_id(user_id):
        """通过 ID 获取用户，不存在返回 None"""
        try:
            return User.objects.get(id=user_id)
        except User.DoesNotExist:
            return None

    @staticmethod
    def deactivate_user(user_id):
        """停用用户账号"""
        try:
            user = User.objects.get(id=user_id)
            user.is_active = False
            user.save(update_fields=['is_active'])
            return True, user
        except User.DoesNotExist:
            return False, None

    @staticmethod
    def get_user_profile(user_id):
        """
        获取用户完整档案

        Args:
            user_id: 用户 ID（int）

        Returns:
            dict 包含用户信息，用户不存在时返回 None
        """
        try:
            # Bug #33 Fix: 原代码写成 usre_id（拼写错误），导致 NameError
            user = User.objects.get(id=user_id)  # line 45 - 修正：user_id
            return {
                'id': user.id,
                'phone': user.phone,
                'nickname': user.nickname,
                'avatar': user.avatar,
                'points': user.points,
                'is_active': user.is_active,
            }
        except User.DoesNotExist:
            logger.warning('UserService.get_user_profile: user not found, user_id=%s', user_id)
            return None

    @staticmethod
    def update_points(user_id, delta, reason=''):
        """
        增减用户积分

        Args:
            user_id: 用户 ID
            delta: 变化量（正为增加，负为减少）
            reason: 变动原因（可选）

        Returns:
            (success: bool, new_points: int)
        """
        try:
            user = User.objects.get(id=user_id)
            user.points = max(0, user.points + delta)
            user.save(update_fields=['points'])
            logger.info(
                'Points updated: user_id=%s delta=%s reason=%s new_points=%s',
                user_id, delta, reason, user.points,
            )
            return True, user.points
        except User.DoesNotExist:
            logger.warning('UserService.update_points: user not found, user_id=%s', user_id)
            return False, 0

    @staticmethod
    def search_users(phone=None, nickname=None, is_active=None):
        """
        搜索用户列表

        Args:
            phone: 手机号（模糊）
            nickname: 昵称（模糊）
            is_active: 是否启用

        Returns:
            QuerySet
        """
        qs = User.objects.all().order_by('-created_at')
        if phone:
            qs = qs.filter(phone__contains=phone)
        if nickname:
            qs = qs.filter(nickname__contains=nickname)
        if is_active is not None:
            qs = qs.filter(is_active=is_active)
        return qs