"""认证相关的请求与响应模型。"""

from datetime import datetime

from pydantic import BaseModel, ConfigDict, Field, field_validator

from app.core.constants import CAPTCHA_LENGTH, PASSWORD_MAX_BYTES


class CaptchaOut(BaseModel):
    """验证码响应。

    图片以 base64 内联返回而非单独的 URL：让 id 与图片在同一响应中成对产生，
    避免前端分两次请求时拿到不匹配的组合。
    """

    captcha_id: str = Field(description="验证码标识，登录时需回传")
    image_base64: str = Field(description="PNG 图片的 base64，不含 data: 前缀")
    expires_in: int = Field(description="有效期（秒）")


class LoginIn(BaseModel):
    """登录请求。"""

    model_config = ConfigDict(str_strip_whitespace=True)

    username: str = Field(min_length=1, max_length=64, description="登录用户名")
    password: str = Field(min_length=1, description="密码")
    captcha_id: str = Field(min_length=1, max_length=64, description="验证码标识")
    captcha_code: str = Field(
        min_length=CAPTCHA_LENGTH,
        max_length=CAPTCHA_LENGTH,
        description="用户填写的验证码",
    )

    @field_validator("password")
    @classmethod
    def _check_password_bytes(cls, value: str) -> str:
        """按**字节数**校验密码长度。

        必须在这里拦下：bcrypt 5.0 起对超过 72 字节的密码直接抛 ValueError，
        而中文一个字符占 3 字节——按字符数校验（如 max_length=20）根本拦不住，
        24 个汉字就会让哈希函数抛异常、登录接口 500。
        """
        if len(value.encode("utf-8")) > PASSWORD_MAX_BYTES:
            raise ValueError(f"密码超过 {PASSWORD_MAX_BYTES} 字节上限")
        return value


class UserBrief(BaseModel):
    """用户简要信息。"""

    model_config = ConfigDict(from_attributes=True)

    id: int
    username: str
    real_name: str | None = None
    roles: list[str] = Field(default_factory=list, description="角色编码列表")
    can_write_payroll: bool = False
    payroll_approval_enabled: bool = False
    permissions: list[str] = Field(default_factory=list)
    authorization_revision: int = 0
    is_payroll_maker: bool = False
    maker_required_permissions: list[str] = Field(default_factory=list)


class LoginOut(BaseModel):
    """登录成功响应。"""

    access_token: str
    token_type: str = "Bearer"
    expires_in: int = Field(description="有效期（秒）")
    user: UserBrief


class CurrentUserOut(UserBrief):
    """当前登录用户信息。"""

    last_login_time: datetime | None = None