"""租户与站点配置模型。

- TenantConfig.data = deep_merge(DEFAULT_CONFIG, snapshot)：租户快照 ⊕ 出厂默认
- Site.brand 的合并基线是**租户级** data["brand"]（而非出厂默认），
  这样租户级 brand 自定义也能被各站点继承。
"""
from dataclasses import dataclass

from app.platform.defaults import DEFAULT_CONFIG, deep_merge


@dataclass(frozen=True)
class Site:
    slug: str
    name: str
    domains: tuple[str, ...]
    brand: dict                 # 站点门面覆盖层 ⊕ 租户默认 brand（已深合并）


@dataclass(frozen=True)
class TenantConfig:
    slug: str
    name: str
    status: str                 # active | disabled
    data: dict                  # deep_merge(DEFAULT_CONFIG, snapshot)
    sites: tuple[Site, ...] = ()

    @classmethod
    def from_snapshot(cls, slug, name, snapshot, sites=(), status="active"):
        merged = deep_merge(DEFAULT_CONFIG, snapshot)
        resolved = tuple(
            Site(s["slug"], s.get("name", s["slug"]), tuple(s.get("domains", ())),
                 deep_merge(merged["brand"], s.get("brand", {})))
            for s in sites)
        return cls(slug=slug, name=name, status=status, data=merged, sites=resolved)