package dwbg

// stripNullValues 递归移除 map/slice 中的 nil，避免 JSON 输出 null。
func stripNullValues(v interface{}) interface{} {
	switch val := v.(type) {
	case map[string]interface{}:
		out := make(map[string]interface{}, len(val))
		for k, item := range val {
			if item == nil {
				continue
			}
			out[k] = stripNullValues(item)
		}
		return out
	case []interface{}:
		out := make([]interface{}, 0, len(val))
		for _, item := range val {
			if item == nil {
				continue
			}
			out = append(out, stripNullValues(item))
		}
		return out
	default:
		return v
	}
}

func reportContainsNull(v interface{}) bool {
	switch val := v.(type) {
	case map[string]interface{}:
		for _, item := range val {
			if item == nil || reportContainsNull(item) {
				return true
			}
		}
	case []interface{}:
		for _, item := range val {
			if item == nil || reportContainsNull(item) {
				return true
			}
		}
	}
	return false
}