"""出厂默认配置。结构 = spec §5.1 的 9 个配置组。
本阶段 brand/wall 的默认值由 Task 4 从 jc 代码提取填充。"""
import copy

DEFAULT_CONFIG: dict = {
    "brand": {
        "title": "AI Support", "color": "#066fc0", "avatar": "/static/kefu-small.png",
        "welcome": "", "topics": [], "placeholder": "",
        "whatsapp": "", "email": "", "privacy_url": "",
    },
    "wall": {},   # Task 4 填充
    "contact": {"cc_completion": True, "email_light_ask": True, "template_languages": ["en", "zh", "es"]},
    "email": {"smtp": None, "sender_name": "", "notify_emails": []},
    "push": {"enabled": False, "url": "", "api_key": "", "prefix": "", "timeout": 10,
             "max_attempts": 3, "retry_backoff_base": 1.0},
    "ai": {"provider": "glm", "api_key": None, "base_url": None, "model": "glm-4-flash"},
    "engine": {"context_seed_keys": {}, "rate_limit_per_hour": 30},
    "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