from datetime import datetime

from pydantic import BaseModel, ConfigDict, Field, model_validator
from sqlalchemy.ext.asyncio import AsyncSession

from app.api.v1.module_system.user.model import UserModel


class AuthSchema(BaseModel):
    """权限认证模型"""

    model_config = ConfigDict(arbitrary_types_allowed=True)

    user: UserModel | None = Field(default=None, description="用户信息")
    check_data_scope: bool = Field(default=True, description="是否检查数据权限")
    db: AsyncSession = Field(description="数据库会话")
    tenant_id: int | None = Field(default=None, description="租户ID,用于用户认证前查询")


class JWTPayloadSchema(BaseModel):
    """JWT载荷模型"""

    sub: str = Field(..., description="用户登录信息")
    is_refresh: bool = Field(default=False, description="是否刷新token")
    exp: datetime | int = Field(..., description="过期时间")

    @model_validator(mode="after")
    def validate_fields(self):
        """
        校验 JWT 载荷字段的基本合法性。

        返回:
        - JWTPayloadSchema: 校验后的载荷实例。

        异常:
        - ValueError: 必填字段为空或格式不正确时抛出。
        """
        if not self.sub or len(self.sub.strip()) == 0:
            raise ValueError("会话编号不能为空")
        return self


class JWTOutSchema(BaseModel):
    """JWT响应模型"""

    model_config = ConfigDict(from_attributes=True)

    access_token: str = Field(..., min_length=1, description="访问token")
    refresh_token: str = Field(..., min_length=1, description="刷新token")
    token_type: str = Field(default="Bearer", description="token类型")
    expires_in: int = Field(..., gt=0, description="过期时间(秒)")


class RefreshTokenPayloadSchema(BaseModel):
    """刷新Token载荷模型"""

    refresh_token: str = Field(..., min_length=1, description="刷新token")


class LogoutPayloadSchema(BaseModel):
    """退出登录载荷模型"""

    token: str = Field(..., min_length=1, description="token")


class CaptchaOutSchema(BaseModel):
    """验证码响应模型"""

    model_config = ConfigDict(from_attributes=True)

    enable: bool = Field(default=True, description="是否启用验证码")
    key: str = Field(..., min_length=1, description="验证码唯一标识")
    img_base: str = Field(..., min_length=1, description="Base64编码的验证码图片")


class AutoLoginUserSchema(BaseModel):
    """免登录用户信息模型"""

    model_config = ConfigDict(from_attributes=True)

    id: int = Field(..., description="用户ID")
    username: str = Field(..., description="用户名")
    name: str = Field(..., description="用户姓名")
    avatar: str | None = Field(default=None, description="头像")


class AutoLoginTokenSchema(BaseModel):
    """免登录Token响应模型"""

    model_config = ConfigDict(from_attributes=True)

    token: str = Field(..., description="免登录Token")
    user: AutoLoginUserSchema = Field(..., description="用户信息")


class TenantOptionSchema(BaseModel):
    """租户选项（用于登录后选择租户）"""

    model_config = ConfigDict(from_attributes=True)

    id: int = Field(..., description="租户ID")
    name: str = Field(..., description="租户名称")
    code: str = Field(..., description="租户编码")


class SelectTenantSchema(BaseModel):
    """选择租户请求"""

    tenant_id: int = Field(..., gt=0, description="租户ID")


class SelectTenantOutSchema(BaseModel):
    """选择租户响应"""

    model_config = ConfigDict(from_attributes=True)

    access_token: str = Field(..., description="访问token（含租户上下文）")
    token_type: str = Field(default="Bearer", description="token类型")
    expires_in: int = Field(..., gt=0, description="过期时间(秒)")


class LoginWithTenantsSchema(JWTOutSchema):
    """登录响应（含租户列表）"""

    tenants: list[TenantOptionSchema] = Field(default_factory=list, description="可选租户列表")
    user_info: dict = Field(default_factory=dict, description="用户信息")