# app/schemas/user.py
from pydantic import BaseModel, EmailStr, Field, validator
from typing import Optional
from datetime import datetime, timezone, timedelta

class UserBase(BaseModel):
    """用户基础模型"""
    username: str = Field(..., min_length=3, max_length=50, example="john_doe")
    email: EmailStr = Field(..., example="user@example.com")
    full_name: Optional[str] = Field(None, example="John Doe")

class UserCreate(UserBase):
    """创建用户模型"""
    password: str = Field(..., min_length=6, example="password123")
    password_confirm: str = Field(..., example="password123")
    
    @validator('password_confirm')
    def passwords_match(cls, v, values, **kwargs):
        if 'password' in values and v != values['password']:
            raise ValueError('密码不匹配')
        return v

class UserLogin(BaseModel):
    """用户登录模型"""
    username: str = Field(..., example="john_doe")
    password: str = Field(..., example="password123")

class UserUpdate(BaseModel):
    """更新用户模型"""
    full_name: Optional[str] = None
    email: Optional[EmailStr] = None

class UserResponse(UserBase):
    """用户响应模型"""
    id: int
    is_active: bool = True
    is_verified: bool = False
    created_at: datetime
    
    class Config:
        from_attributes = True

class UserProfile(UserResponse):
    """用户详情模型"""
    last_login: Optional[datetime] = None
    avatar: Optional[str] = None

class PasswordChange(BaseModel):
    """修改密码模型"""
    current_password: str
    new_password: str = Field(..., min_length=6)
    confirm_password: str
    
    @validator('confirm_password')
    def passwords_match(cls, v, values, **kwargs):
        if 'new_password' in values and v != values['new_password']:
            raise ValueError('新密码不匹配')
        return v

__all__ = [
    "UserBase",
    "UserCreate",
    "UserLogin",
    "UserUpdate",
    "UserResponse",
    "UserProfile",
    "PasswordChange"
]