"""封面模板领域实体。"""

from dataclasses import dataclass, field
from datetime import UTC, datetime
from typing import Any
from uuid import uuid4


@dataclass(slots=True)
class CoverTemplate:
    """封面模板实体，支持系统预置和用户自定义。"""

    id: str
    user_id: str | None  # None 表示系统模板
    name: str
    thumbnail_url: str
    is_system: bool
    config: dict[str, Any]
    created_at: datetime = field(default_factory=lambda: datetime.now(UTC))
    updated_at: datetime = field(default_factory=lambda: datetime.now(UTC))

    @classmethod
    def create_system(
        cls,
        name: str,
        config: dict[str, Any] | None = None,
        thumbnail_url: str = "",
    ) -> "CoverTemplate":
        """创建系统模板。"""
        template_id = uuid4().hex
        return cls(
            id=template_id,
            user_id=None,
            name=name.strip(),
            thumbnail_url=thumbnail_url,
            is_system=True,
            config=config or {},
        )

    @classmethod
    def create_user(
        cls,
        user_id: str,
        name: str,
        config: dict[str, Any] | None = None,
        thumbnail_url: str = "",
    ) -> "CoverTemplate":
        """创建用户自定义模板。"""
        clean_name = name.strip()
        if not clean_name:
            raise ValueError("模板名称不能为空")
        template_id = uuid4().hex
        return cls(
            id=template_id,
            user_id=user_id,
            name=clean_name,
            thumbnail_url=thumbnail_url,
            is_system=False,
            config=config or {},
        )

    def update(
        self,
        name: str | None = None,
        config: dict[str, Any] | None = None,
        thumbnail_url: str | None = None,
    ) -> None:
        """更新模板属性。"""
        if name is not None:
            clean_name = name.strip()
            if not clean_name:
                raise ValueError("模板名称不能为空")
            self.name = clean_name
        if config is not None:
            self.config = config
        if thumbnail_url is not None:
            self.thumbnail_url = thumbnail_url
        self.updated_at = datetime.now(UTC)