from pydantic import BaseModel, Field
from typing import Any, Dict, Generic, List, Optional, TypeVar, Union

T = TypeVar('T')

class StandardResponse(BaseModel, Generic[T]):
    """标准API响应模型"""
    success: bool = Field(True, description="请求是否成功")
    code: int = Field(200, description="业务状态码")
    message: str = Field("操作成功", description="响应消息")
    data: Optional[T] = Field(None, description="响应数据")

class PageInfo(BaseModel):
    """分页信息"""
    page: int = Field(..., description="当前页码")
    size: int = Field(..., description="每页大小")
    total: int = Field(..., description="总记录数")
    pages: int = Field(..., description="总页数")

class PagedResponse(BaseModel, Generic[T]):
    """分页响应数据"""
    items: List[T] = Field(..., description="数据列表")
    page_info: PageInfo = Field(..., description="分页信息")

class ErrorDetail(BaseModel):
    """错误详情"""
    loc: List[str] = Field(..., description="错误位置")
    msg: str = Field(..., description="错误消息")
    type: str = Field(..., description="错误类型")

class ValidationError(BaseModel):
    """验证错误响应"""
    detail: List[ErrorDetail]

class HealthCheck(BaseModel):
    """健康检查项目"""
    status: str = Field(..., description="状态")
    message: str = Field(..., description="消息")

class HealthCheckResponse(BaseModel):
    """健康检查响应"""
    checks: Dict[str, HealthCheck] = Field(..., description="检查项目")

class TokenResponse(BaseModel):
    """令牌响应"""
    access_token: str = Field(..., description="访问令牌")
    token_type: str = Field("bearer", description="令牌类型")
    expires_in: int = Field(..., description="过期时间(秒)")

class FileUploadResponse(BaseModel):
    """文件上传响应"""
    file_id: str = Field(..., description="文件ID")
    url: str = Field(..., description="文件URL")
    file_name: str = Field(..., description="文件名")
    content_type: str = Field(..., description="内容类型")
    size: int = Field(..., description="文件大小(字节)")