/*
Copyright (c) 2025 WuJingrun（吴京润）

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
 */
package f_time

public interface ExtendDuration {
    prop ago: DateTime
    prop later: DateTime
    func before(current: DateTime): DateTime
    func after(current: DateTime): DateTime
}

extend Duration <: ExtendDuration {
    public prop ago: DateTime {
        get() {
            return DateTime.now() - this
        }
    }
    public prop later: DateTime {
        get() {
            return DateTime.now() + this
        }
    }
    public func before(current: DateTime): DateTime {
        return current - this
    }
    public func after(current: DateTime): DateTime {
        return current + this
    }
}