namespace WarhoundConsole
{
    public abstract class Job
    {
        private readonly TimeSpan interval;

        private Task task;
        private DateTime lastExecutedTime;

        public Job(TimeSpan interval)
        {
            if (interval <= TimeSpan.Zero)
            {
                throw new ArgumentOutOfRangeException(nameof(interval));
            }

            this.interval = interval;
            this.task = Task.CompletedTask;
            this.lastExecutedTime = DateTime.MinValue;
        }

        public bool TryExecute()
        {
            try
            {
                var now = DateTime.Now;
                if (now - this.lastExecutedTime < this.interval)
                {
                    return false;
                }

                if (!this.task.IsCompleted)
                {
                    // 이 경우 로그를 출력하도록 하고, 타이밍을 조절해야한다.
                    //Console.WriteLine($"Job skipped at {DateTime.Now}");
                    return false;
                }

                this.lastExecutedTime = now;

                this.task = Task.Run(async () =>
                {
                    await this.Execute();
                });
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }

            return true;
        }

        protected abstract Task Execute();

        public void Wait()
        {
            this.task?.Wait();
        }
    }
}