"""出厂默认配置。结构 = spec §5.1 的 9 个配置组。
brand 由租户 seed（seed_profiles/<slug>/）提供；wall 由租户 seed 的
wall.json 提供（app/engine/wall_schema.compile_wall 编译），出厂均留空。
只读约定：消费者不得修改本 dict，需要定制走 deep_merge 拷贝。"""
import copy

DEFAULT_CONFIG: dict = {
    "brand": {
        "title": "AI Support", "color": "#066fc0", "avatar": "/static/kefu-small.png",
        "welcome": "", "topics": [], "placeholder": "",
        "whatsapp": "", "email": "", "privacy_url": "",
    },
    "wall": {},   # wall 由租户 seed 的 wall.json 提供，出厂留空
    "contact": {"cc_completion": True, "email_light_ask": True, "template_languages": ["en", "zh", "es"]},
    "email": {"smtp": None, "sender_name": "", "notify_emails": []},
    # 数值字段出厂哨兵 None = "未设置"(与 ai.model 同款纪律):
    # resolve_push_settings 对 None 回退 env PUSH_*(settings 自带部署级默认,
    # 最终行为不变)——truthy 出厂默认(10/3/1.0)会永久遮住 env 同名覆盖
    "push": {"enabled": False, "url": "", "api_key": "", "prefix": "",
             "timeout": None, "max_attempts": None, "retry_backoff_base": None},
    "ai": {"provider": "glm", "api_key": None, "base_url": None,
           # 双源防漂移: 出厂 model 须与 config_views._FACTORY_DEFAULT_MODEL 一致
           # (resolve_ai_settings 的"未设置"哨兵;测试强制同步)
           "model": "glm-4-flash"},
    "engine": {"context_seed_keys": {},
               # 双源防漂移: 默认值须与 rate_limit.DEFAULT_MAX 一致
               # (chat_rest 空槽兜底读它)
               "rate_limit_per_hour": 30,
               # 双源防漂移: 默认值须与 conn_limiter.DEFAULT_WS_CONN_LIMIT 一致
               "ws_conn_limit": 10},
    "misc": {"name_to_region_extras": {}},
}


def deep_merge(base: dict, override: dict) -> dict:
    """override 逐层覆盖 base；dict 递归合并，其余类型整体替换。不修改入参。"""
    out = copy.deepcopy(base)
    for k, v in (override or {}).items():
        if isinstance(v, dict) and isinstance(out.get(k), dict):
            out[k] = deep_merge(out[k], v)
        else:
            out[k] = copy.deepcopy(v)
    return out